U.S. patent application number 10/783273 was filed with the patent office on 2004-08-26 for automatic vehicle exterior light control system assemblies.
Invention is credited to Ejsmont, Gregory M., Fogg, Jeremy A., Stam, Joseph S., Tuttle, Darin D..
Application Number | 20040164228 10/783273 |
Document ID | / |
Family ID | 32872094 |
Filed Date | 2004-08-26 |
United States Patent
Application |
20040164228 |
Kind Code |
A1 |
Fogg, Jeremy A. ; et
al. |
August 26, 2004 |
Automatic vehicle exterior light control system assemblies
Abstract
The present invention relates to various improvements relating
to automatic vehicle equipment control systems.
Inventors: |
Fogg, Jeremy A.; (Holland,
MI) ; Ejsmont, Gregory M.; (Grand Rapids, MI)
; Tuttle, Darin D.; (Byron Center, MI) ; Stam,
Joseph S.; (Holland, MI) |
Correspondence
Address: |
PRICE, HENEVELD, COOPER, DEWITT, & LITTON,
LLP/GENTEX CORPORATION
695 KENMOOR, S.E.
P O BOX 2567
GRAND RAPIDS
MI
49501
US
|
Family ID: |
32872094 |
Appl. No.: |
10/783273 |
Filed: |
February 20, 2004 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
60448793 |
Feb 21, 2003 |
|
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|
Current U.S.
Class: |
250/208.1 |
Current CPC
Class: |
B60R 2001/1223 20130101;
B60Q 1/1423 20130101; F21S 41/60 20180101; B60R 2001/1253
20130101 |
Class at
Publication: |
250/208.1 |
International
Class: |
H01L 027/00 |
Claims
What is claimed is:
1. An automatic vehicle exterior light control system, comprising:
an attachment member and carrier/baffle configured to secure an
imager board within approximately 5 degrees and approximately -5
degrees of a desired image sensor optical axis.
2. An automatic vehicle exterior light control system as in claim 1
wherein the control system is configured to self calibrate an image
area of an image sensor to compensate for minor image sensor
misalignment.
3. An automatic vehicle exterior light control system as in claim 1
wherein said imager board is vertically aligned within
approximately 5 degrees and approximately -5 degrees of a desired
image sensor optical axis.
4. An automatic vehicle exterior light control system as in claim 1
wherein said imager board is horizontally aligned within
approximately 5 degrees and approximately -5 degrees of a desired
image sensor optic axis.
5. An automatic vehicle exterior light control system as in claim
1, said attachment member further comprising a ball for attachment
of a rearview mirror assembly.
6. An automatic vehicle exterior light control system as in claim 1
wherein the image sensor and at least one other device selected
from the group comprising; an image sensor control logic; an A/D
converter; a low voltage differential signal line driver; a
temperature sensor; control output; a voltage regulator; a second
image sensor; a microprocessor; a moisture sensor and a compass are
integrated in a common application specific integrated chip.
7. An automatic vehicle exterior light control system as in claim 6
wherein said image sensor and said at least one other device are
integrated on a common silicon wafer.
8. An automatic vehicle exterior light control system, comprising:
an attachment member and a carrier that cooperate to define an
image sensor optical axis.
9. An automatic vehicle exterior light control system as in claim 8
further comprising at least one shim positioned at least partially
between said attachment member and said carrier to define a second
image sensor optical axis.
10. An automatic vehicle exterior light control system as in claim
8, said image sensor comprising peripheral pixels that surround
pixels associated with a nominal field of view.
11. An automatic vehicle exterior light control system as in claim
10 further comprising automatic alignment means to compensate for
minor image sensor optical axis misalignment.
12. An automatic vehicle exterior light control system as in claim
8, said attachment member further comprising a ball for attachment
of a rearview mirror assembly.
13. An automatic vehicle exterior light control system as in claim
8 wherein the image sensor and at least one other device selected
from the group comprising; an image sensor control logic; an A/D
converter; a low voltage differential signal line driver; a
temperature sensor; control output; a voltage regulator; a second
image sensor; a microprocessor; a moisture sensor and a compass are
integrated in a common application specific integrated chip.
14. An automatic vehicle exterior light control system as in claim
13 further comprising at least one shim positioned at least
partially between said attachment member and said carrier to define
a second image sensor optical axis.
15. An automatic vehicle exterior light control system, comprising:
a mechanical image sensor repositioning means that allows automatic
and, or, manual image sensor alignment.
16. An automatic vehicle exterior light control system as in claim
15 an automatic image sensor repositioning means further comprises
at least one input selected from the group comprising: a pitch
sensor, a yaw sensor, a turning sensor, a breaking sensor, an
acceleration sensor and a load sensor.
17. An automatic vehicle exterior light control system, comprising:
an attachment member and carrier configured to secure an imager
board within approximately 5 degrees and approximately -5 degrees
of a desired image sensor optical axis, said attachment member and
said carrier cooperate to define an image sensor optical axis; and
a mechanical image sensor repositioning means that allows automatic
and, or, manual image sensor alignment.
18. An automatic vehicle exterior light control system as in claim
17 wherein the image sensor and at least one other device selected
from the group comprising; an image sensor control logic; an A/D
converter; a low voltage differential signal line driver; a
temperature sensor; control output; a voltage regulator; a second
image sensor; a microprocessor; a moisture sensor and a compass are
integrated in a common application specific integrated chip.
19. An automatic vehicle exterior light control system as in claim
18 further comprising at least one shim positioned at least
partially between said attachment member and said carrier to define
a second image sensor optical axis.
20. An automatic vehicle equipment control system, comprising: an
attachment member and carrier configured to secure an imager board
within approximately 5 degrees and approximately -5 degrees of a
desired image sensor optical axis, said attachment member and said
carrier cooperate to define an image sensor optical axis.
21. An automatic vehicle equipment control system as in claim 20
wherein the image sensor and at least one other device selected
from the group comprising; an image sensor control logic; an A/D
converter; a low voltage differential signal line driver; a
temperature sensor; control output; a voltage regulator; a second
image sensor; a microprocessor; a moisture sensor and a compass are
integrated in a common application specific integrated chip.
22. An automatic vehicle equipment control system as in claim 21
further comprising at least one shim positioned at least partially
between said attachment member and said carrier to define a second
image sensor optical axis.
23. An automatic vehicle equipment control system as in claim 20
further comprising at least one device selected from the group
comprising: an electro-optic mirror element; an ambient light
sensor; a glare light sensor; an information display; an indicator;
a microphone; a compass; an operator interface; a temperature
indicator; a Bluetooth interface; a wireless transceiver; a vehicle
bus interface; a passenger side restraint status display and an
electro-optic mirror element control.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] The present application claims priority, under 35 U.S.C.
.sctn.119(e), to U.S. provisional patent application serial No.
60/448,793, filed on Feb. 21, 2003. The disclosure of this
provisional patent application is incorporated herein in its
entirety by reference.
BACKGROUND OF THE INVENTION
[0002] Automatic vehicle exterior light control systems provide a
significant convenience function for drivers by alleviating the
burden of manually switching between high and low beam headlights
in response to changing traffic conditions. It is known that
drivers, on average, do not utilize their high beam headlights as
often as is appropriate. High beam headlights can provide from two
to four, or more, times the visibility distance at night as
compared to low beam headlights. Thereby, a driver of a controlled
vehicle is enabled to detect an obstacle or pedestrian at night
earlier than otherwise would be the case. There is a safety benefit
during night time driving introduced by automating the beam
switching task and increasing the average utilization of high beam
headlights.
[0003] Known systems designed to automatically control vehicle
exterior lights utilize a forward looking digital imaging system to
acquire images of the scene generally in front of the controlled
vehicle, to analyze the images and to detect headlights of oncoming
vehicles and taillights of leading vehicles. It has become apparent
that repeatable and predictable vehicle to vehicle system operation
suffers when misalignment is present in the corresponding imaging
assemblies.
[0004] What are needed are automatic vehicle exterior light control
systems that provide improved features to accurately detect related
images generally forward of a controlled vehicle. Systems
configured to automatically account for minor imager assembly
misalignments are also needed.
SUMMARY OF THE INVENTION
[0005] The present invention provides automatic vehicle exterior
light control systems that provide improved features to accurately
detect related images generally forward of a controlled vehicle.
Systems configured to automatically account for minor imager
assembly misalignments are also provided.
[0006] In at least one embodiment, an imager assembly mounting
means is provide that insures accurate alignment of an imager
assembly with respect to the desired field of view. In a related
embodiment, an imager assembly mounting means provides for quick
installation within an associated controlled vehicle.
[0007] In at least one embodiment, features are provided within the
imager assembly mounting means that insure proper selection for the
specific controlled vehicle requirements. In a related embodiment,
incorrect assembly is prevented.
[0008] In at least one embodiment, an imager assembly mounting
means is provided that exploits use of snap together components for
quick and efficient manufacturing. In a related embodiment, a
minimum of tools are required for assembling the imager assembly
mounting means.
[0009] In at least one embodiment, various improvements of the
present invention are integrated with other vehicular systems. In
at least one related embodiment, the various integrated systems are
configured to share components for improved operation and, or, to
lower associated costs.
[0010] Other advantages of the present invention will become
apparent when reading the following detail description in light of
the figures, examples and appended claims.
BRIEF DESCRIPTION OF THE FIGURES
[0011] FIG. 1 depicts a controlled vehicle relative to the
taillights of a leading vehicle and the headlights of an oncoming
vehicle;
[0012] FIG. 2 depicts a controlled vehicle;
[0013] FIG. 3a depicts a perspective view of an interior rearview
mirror assembly;
[0014] FIG. 3b depicts a second perspective view of the mirror
assembly of FIG. 3;
[0015] FIG. 4 depicts a perspective view of an exploded stationary
assembly;
[0016] FIG. 5 depicts a second perspective view of the stationary
assembly of FIG. 4;
[0017] FIG. 6 depicts a perspective view of an attachment
member;
[0018] FIG. 7 depicts a second perspective of the attachment member
of FIG. 6;
[0019] FIG. 8 depicts a perspective view of a carrier/baffle;
[0020] FIG. 9 depicts a perspective view of an exploded rearview
mirror assembly;
[0021] FIG. 10 depicts a second perspective view of the mirror
assembly of FIG. 9;
[0022] FIG. 11 depicts a perspective view of a second exploded
stationary assembly;
[0023] FIG. 12 depicts a second perspective view of the stationary
assembly of FIG. 11
[0024] FIG. 13 depicts a perspective view of a third exploded
stationary assembly;
[0025] FIG. 14 depicts a second perspective view of the stationary
assembly of FIG. 13;
[0026] FIG. 15 depicts a perspective view of an exploded front
housing;
[0027] FIGS. 16a and 16b depict actual image sensor alignment
values;
[0028] FIG. 17 depicts image sensor field of view versus
alignment;
[0029] FIG. 18 depicts actual taillight count versus image
position;
[0030] FIG. 19 depicts actual headlamp count versus image
position;
[0031] FIG. 20 is a pictorial representation of the data of Table
5; and
[0032] FIG. 21 is a pictorial representation of the data of Table
6.
DETAILED DESCRIPTION OF THE INVENTION
[0033] Referring initially to FIG. 1, for illustrative purposes, an
automatic vehicle exterior light control system 106 is shown to be
installed within a controlled vehicle 105. Although the control
system 106 is depicted to be integral with the interior rearview
mirror assembly, it should be understood that the control system,
or any of the individual components thereof, may be mounted in any
suitable location within the interior, or on the exterior, of the
controlled vehicle 105. The term "controlled vehicle" is used
herein with reference to a vehicle comprising an automatic vehicle
exterior light control system. Suitable locations for mounting the
associated image sensor are those locations that provide an
unobstructed view of the scene generally forward of the controlled
vehicle 105 and allow for detection of headlights 116 of oncoming
vehicles 115 and taillights 111 of leading vehicles 110 within the
glare zone 108 associated with the controlled vehicle.
[0034] FIG. 2 depicts a controlled vehicle 205 comprising an
interior rearview mirror assembly 206 incorporating an automatic
vehicle exterior light control system. The processing and control
system functions to send configuration data to the imager, receive
image data from the imager, to process the images and to generate
exterior light control signals. Detailed descriptions of such
automatic vehicle exterior light control systems are contained in
commonly assigned U.S. Pat. Nos. 5,837,994, 5,990,469, 6,008,486,
6,130,448, 6,130,421, 6,049,171, 6,465,963, 6,403,942, 6,587,573,
6,611,610, 6,621,616, 6,631,316 and U.S. patent application Ser.
Nos. 10/208,142, 09/799,310, 60/404,879, 60/394,583, 10/235,476 and
09/800,460 and Attorney docket numbers AUTO 211US1 and AUTO 211US2;
the disclosures of which are incorporated herein in their
entireties by reference. The controlled vehicle is also depicted to
include a driver's side outside rearview mirror assembly 210a, a
passenger's side outside rearview mirror assembly 210b, a center
high mounted stop light (CHMSL) 245, A-pillars 250a, 250b,
B-pillars 255a, 255b and C-pillars 260a, 260b; it should be
understood that any of these locations may provide alternate
locations for an image sensor, image sensors or related processing
and, or, control components. It should be understood that any, or
all, of the rearview mirrors may be automatic dimming electro-optic
mirrors. The controlled vehicle is depicted to include a host of
exterior lights including headlights 220a, 220b, foul weather
lights 230a, 230b, front turn indicator/hazard lights 235a, 235b,
tail lights 225a, 225b, rear turn indicator lights 226a, 226b, rear
hazard lights 227a, 227b and backup lights 240a, 240b. It should be
understood that additional exterior lights may be provided, such
as, separate low beam and high beam headlights, integrated lights
that comprise multipurpose lighting, etc. It should also be
understood that any of the exterior lights may be provided with
positioners (not shown) to adjust the associated optical axis of
the given exterior light. It should be understood that the
controlled vehicle of FIG. 2 is generally for illustrative purposes
and that suitable automatic vehicle exterior light control systems,
such as those disclosed in the patents and patent applications
incorporated herein by reference, may be employed along with other
features described herein and within disclosures incorporated
herein by reference.
[0035] Turning now to FIGS. 3a and 3b, an embodiment of an interior
rearview mirror assembly 300a, 300b is shown. The mirror assembly
includes a stationary accessory assembly enclosed within a front
housing 385a, 385b and a rear housing 390a, 390b. The front housing
comprises an aperture 386b defining an image sensor visual opening.
The stationary accessory assembly along with a rearview mirror are
carried by an attachment member 355a, 355b. The rearview mirror
comprises a mirror housing 360a, 360b, a bezel 361a, 361b and a
mirror element 362a. A wire cover 394a, 394b is included to conceal
related wiring 315b. The rearview mirror assembly 300a, 300b also
incorporates an ambient light sensor 365b, at least one microphone
366b, a glare light sensor 365a, operator interfaces 363a,
indicators 364a and at least one information display 370.
[0036] When viewed from an image sensor's perspective, and as used
herein, the x-axis is a longitudinal axis associated with a
controlled vehicle (i.e. the optical axis of the image sensor), the
y-axis is a cross-car axis associated with a controlled vehicle
(i.e. horizontal axis of the image sensor) and the z-axis is a
vertical axis of an associated controlled vehicle (i.e. vertical
axis of the image sensor). Vertical rotation of the image sensor
refers to rotation about the y-axis, defined in terms of up/down
angular motion. Horizontal rotation of the image sensor refers to
rotation about the z-axis, defined in terms of left/right angular
motion. Skew rotation of the image sensor refers to rotation about
the x-axis. Angular variation of an imager board installed in a
controlled vehicle has a direct effect on the optical axis of the
image sensor. Angular rotation shifts the "sweet spot" and the
field of view causing increased field limit in one direction and
decreased field limit in another direction. Positional variation of
an imager board installed in a controlled vehicle has minimal
effect on performance of an associated automatic vehicle exterior
light control system. Millimeters of positional movement, which is
a typical tolerance, causes little angular variation of the optical
axis (i.e. typically less than 0.001 degree) at distances of 300
meters or greater. A preferred nominal image sensor field of view
when incorporated in an automatic vehicle exterior light control
system is approximately 15 degrees left, approximately 15 degrees
right, approximately 4 degrees up and approximately 4 degrees down
with respect to the optical axis.
[0037] Associated mechanical variations may be due to anyone, or a
combination, of: 1) carrier/baffle tolerance, board surface; 2)
carrier/baffle tolerance, registration portions; 3) attachment
member, carrier/baffle mounting surface; 4) attachment member,
button receptacle and 5) imager board thickness. Table 1 summarizes
angular variations.
1TABLE 1 Angular Variation Study Source of Variation Preferred Max
Up/Down Right/Left Carrier/Baffle - imager 0.2 mm Surf +/-0.401 deg
+/-0.316 deg board mounting Carrier/baffle - 0.2 mm Surf +/-0.318
deg +/-0.249 deg registration portions Attachment member - 0.13 mm
Surf +/-0.207 deg +/-0.162 deg carrier/baffle Attachment member -
0.1 mm Surf +/-0.215 deg +/-0.316 deg button recepticle Imager
board thickness +/-0.005" +/-0.260 deg +/-0.140 deg Total +/-1.401
+/-1.183 deg
[0038] Expected controlled vehicle level variations may include
anyone or combinations of: 1) windshield form, sag tolerance; 2)
sheet metal variation; 3) windshield adhesive thickness; 4)
windshield position; 5) button position; 6) button rotation; 7)
"Bigfoot" button; 8) button adhesive; 9) vehicle attitude build
variation and 10) vehicle load. Tables 2 through 4 contain
summaries of data related to vehicle level variations.
2TABLE 2 Image Sensor Optical Axis Angular Variation versus
Windshield Angle and Button Rotation Wind- shield 1 degree button
rotation 2 degree button rotation 3 degree button rotation 4 degree
button rotation Angle H V S H V S H V S H V S 20 0.940.degree.
0.003.degree. 0.342.degree. 1.879.degree. 0.011.degree.
0.684.degree. 2.819.degree. 0.025.degree. 1.026.degree.
3.759.degree. 0.045.degree. 1.368.degree. 30 0.866.degree.
0.004.degree. 0.500.degree. 1.732.degree. 0.015.degree.
1.000.degree. 2.598.degree. 0.034.degree. 1.500.degree.
3.464.degree. 0.060.degree. 2.000.degree. 40 0.766.degree.
0.004.degree. 0.643.degree. 1.532.degree. 0.017.degree.
1.286.degree. 2.298.degree. 0.039.degree. 1.928.degree.
3.064.degree. 0.069.degree. 2.571.degree. 50 0.643.degree.
0.004.degree. 0.766.degree. 1.286.degree. 0.017.degree.
1.532.degree. 1.928.degree. 0.039.degree. 2.298.degree.
2.571.degree. 0.069.degree. 3.064.degree. 60 0.500.degree.
0.004.degree. 0.866.degree. 1.000.degree. 0.015.degree.
1.732.degree. 1.500.degree. 0.034.degree. 2.598.degree.
2.000.degree. 0.06.degree.0 3.464.degree. 70 0.342.degree.
0.003.degree. 0.940.degree. 0.684.degree. 0.011.degree.
1.879.degree. 1.026.degree. 0.025.degree. 2.819.degree.
1.368.degree. 0.045.degree. 3.759.degree.
[0039]
3TABLE 3 Angular Variation Study Preferred maximum Up/Down
Right/Left Windshield Sag +/-3.5 mm +/-0.615 deg +/-0.006 deg Sheet
Metal Variation +/-3 mm +/-0.24 deg +/-0.24 deg Adhesive Thickness
+/-3.5 mm +/-0.52 deg +/-0.26 deg Windshield Position +/-3 mm
+/-0.03 deg +/-0.08 deg Button Position +/-6 mm +/-0.09 deg +/-0.13
deg Button Rotation +/-1.5 deg +/-0.003 deg +/-1.34 deg Total
+/-1.498 deg +/-2.056 deg Bigfoot Button +/-0.38 deg +/-0.35 deg
Vehicle Build Variation +/-0.8 deg Vehicle Load Study +/-0.7
deg
[0040]
4TABLE 4 Angular Variation Study Prefered Mechanical Variables
Maximum Up/Down Right/Left Carrier/Baffle - Imager 0.2 mm Surf
+/-0.401 deg +/-0.316 deg Board Carrier/Baffle - 0.2 mm Surf
+/-0.318 deg +/-0.249 deg registration portion surface Attachment
member - 0.13 mm Surf +/-0.207 deg +/-0.162 deg Carrier/Baffle
Attachment member - 0.1 mm Surf +/-0.215 deg +/-0.316 deg Button
recepticle Imager Board +/-0.005" +/-0.260 deg +/-0.140 deg
Thickness Total +/-1.401 +/-1.183 deg Vehicle Variables Spec
Up/Down Right/Left Windshield Sag +/-3.5 mm +/-0.615 deg +/-0.006
deg Sheet Metal Variation +/-3 mm +/-0.24 deg +/-0.24 deg Adhesive
Thickness +/-3.5 mm +/-0.52 deg +/-0.26 deg Windshield Position
+/-3 mm +/-0.03 deg +/-0.08 deg Button Position +/-6 mm +/-0.09 deg
+/-0.13 deg Button Rotation +/-1.5 deg +/-0.003 deg +/-1.34 deg
Total +/-1.498 deg +/-2.056 deg Total Mechanical and +/-2.899 deg
+/-3.239 deg Vehicle Variables Statistically Probable +/-1.065 deg
+/-1.501 deg Variation (3.sigma.) SPV with Veh Load, +/-1.552 deg
+/-1.501 deg Build and Bigfoot (3.sigma.) SPV with 0.75 Degree
+/-1.065 deg +/-0.95 deg Button Rot (3.sigma.) SPV with 3.0 Degree
+/-1.065 deg +/-2.76 deg Button Rot (3.sigma.) SPV with 5.0 Degree
+/-1.065 deg +/-4.51 deg Button Rot (3.sigma.)
[0041] Turning now to FIGS. 4 and 5, there are shown exploded,
perspective, views of an accessory and rearview mirror mount
assembly 405, 505. In a preferred embodiment, the accessory and
rearview mirror mount assembly provides a rigid structure for
mounting a repositionably mounted interior rearview mirror along
with a stationarily mounted image sensor. As will be described in
detail herein, the preferred accessory and rearview mirror mount
assembly facilitates ease of assembly as well as provides for
repeatable, reliable and precise alignment of the related
components. In at least one embodiment, the associated imager is
used for automatic exterior vehicle light control or which
precision alignment of the image sensor is preferred.
[0042] Imager board 410, 510 is provided with an image sensor with
lens 411. In a preferred embodiment, the imager board will also
include an image sensor control logic and timing circuit,
communication line drivers and wire harness receptacle 413.
Optionally, the imager board may comprise a processor for receiving
and, at least partially, processing images obtained from the image
sensor. In a preferred embodiment, the image sensor and at least
one other device selected from the group comprising; 1) an image
sensor control logic; 2) an A/D converter; 3) a low voltage
differential signal line driver; 4) a temperature sensor; 5) a
control output; 6) a voltage regulator; 7) a second image sensor;
8) a microprocessor; 9) a moisture sensor and 10) a compass are
integrated in a common ASIC, most preferably on a common silicon
wafer. Preferably, the image sensor with lens 411 includes lens
cover snap portions 412 for engaging lens cover 420, 520 snap clips
421. The lens cover has an aperture 422 for alignment with the
optical axis of the image sensor and lens. Various suitable optical
systems, such as those depicted and described in commonly assigned
U.S. Pat. Nos. 5,990,469; 6,008,486; 6,130,421; 6,130,448;
6,049,171; and 6,403,942 and U.S. Patent Application Attorney
Docket number AUTO 318V1; the disclosures of which are incorporated
herein in their entireties by reference; may be employed.
[0043] An imager board wiring harness (not shown) is preferably
provided with plugs on either end thereof. The imager board is
preferably provided with a male receptacle 413 for receiving one of
the plugs of the imager board wiring harness (not shown).
[0044] With additional reference to FIG. 5, a lens cover 420, 520
is snapped onto the lens and then the imager board is placed on the
carrier/baffle 430, 530 such that the alignment pins 531, 831 are
received within the alignment holes 514 such that the image sensor
with lens 411 and lens cover are aligned with the baffle aperture
832. Preferably, the alignment pins and, or, holes are slightly
tapered such that the pins are initially freely received within the
alignment holes then become snug once the imager board is pressed
into place upon the carrier/baffle. Preferably, the lens cover is
further secured in place by the lens cover retainers 833. It should
be understood that the baffle may be a separate part that snaps in
place on a separate carrier.
[0045] Once the imager board is in place upon the carrier/baffle,
the imager board retainer 445, 545 is placed such that the imager
board is retained upon the carrier/baffle. Preferably, the imager
board retainer comprises hinge portions 446 that are received
within the hinge receptacles 534, 834 with the imager board
retainer substantially perpendicular to the carrier/baffle. The
imager board retainer is preferably then pivoted around the hinge
portions such that the clip portions 447 are received within clip
receptacles 535, 835 and retained therein via interlocking clips.
It should be understood that the imager board retainer may be
configured to snap in place at three, four or more points in lieu
of the hinge portions on one end.
[0046] A far field baffle 450, 550 is snapped onto the
carrier/baffle such that the aperture 452, 552 is aligned with the
baffle aperture 832 and such that the far field baffle snap clips
451, 551 are engaged with far field snap portions 443 on either
side of the baffle. The far field baffle, in part, defines the
field of view of the associated image sensor.
[0047] The carrier/baffle 430, 530 is placed proximate the
attachment member 455, 555, 655, 755 such that the registration
portions 837 are received within the registration receptacles 456,
556, 656. Four fasteners 475, 575 are placed through fastener slots
457, 557, 657, 757 and received within fastener receptacles 841 to
secure the carrier/baffle to the attachment member. Alternatively,
an alignment shim assembly 458 may be provided with individually
removable alignment shims 459. Each alignment shim is provided with
at least a first graduation 459a and, preferably, with second and
third graduations 459b, 459c, respectively. The alignment shims may
provide a means for expanding the applicability of any one
accessory and rearview mirror mount assembly 405, 505 to a broader
array of vehicles and windshield configurations. Preferably, the
fasteners are threaded screws and the fastener receptacles are
provided with mating threads. Optionally, the fasteners and
fastener receptacles may be configured with interference fit
functionality such that the fasteners are pressed into the fastener
receptacles. It should be understood that the carrier/baffle may be
configured to snap onto the attachment member in lieu of using
fasteners.
[0048] The transparent cover 480, 580 is attached to the front
housing 485, 585 such that the transparent cover is fixed to the
front housing to close the aperture 486. The transparent cover may
be assembled with a spring clip 481 using housing interlocks 481a,
481b and spring clip interlocks (shown as elements 1589a, 1589b in
FIG. 15). Preferably, the transparent cover is substantially
transparent to light rays in the visible spectrum, however,
incorporates an infrared and, or, ultra violet spectral filter
characteristic. Thereby, substantially blocking infrared and, or,
ultra violet light rays from impinging upon the image sensor. Front
housing 485, 585 is preferably provided with a recessed periphery
with snap interlock 487, 587 to engage an inner perimeter with snap
interlock 493, of a rear housing 490, 590. The front housing and
rear housing combine to define an enclosure.
[0049] With further reference to FIG. 8, the carrier/baffle is
preferably provided with a part match pin 844 that is located on an
opposite side from a part match pin on the front or rear housing
such that a particular carrier/baffle will only allow assembly with
an appropriate housing. The part match pin is provided to allow for
sure assembly of matching parts because it is envisioned that the
carrier/baffle will be configured to match a specific vehicle
windshield angle and wire cover. For example, a carrier/baffle for
a 24.3 degree angle windshield vehicle that has a rear housing 490,
590 with a first wire cover will not work with a rear housing 490,
590 that does not have a wire cover (i.e. the part match pins will
be aligned, thereby, prohibiting assembly). When the correct
carrier/baffle is mated with the correspondingly correct rear
housing, the part match pins will not be aligned and assembly will
be impeded.
[0050] As further shown in FIG. 8, the carrier/baffle is provided
with upper standoffs 838 and lower standoffs 840 which, in part,
define the angle at which the associated image sensor board and
compass sensors are placed with respect to an associated vehicle
windshield. In a preferred embodiment, the angle may be selected by
providing a predetermined upper and lower standoff length. In a
preferred embodiment, the angle of the imager with respect to the
windshield will range from approximately 20 to approximately 35
degrees, more preferably from approximately 24.3 to approximately
30 degrees. The preferred accessory and rearview mirror mount
assembly will provide for this range with only changing the upper
and/or lower standoff lengths. To further expand the accommodated
windshield angles, the attachment member will be altered as
described elsewhere herein.
[0051] With additional reference to FIGS. 6 and 7, the attachment
member 455, 555, 655, 755 are depicted in greater detail. The
attachment member is configured to slidably engage a vehicle
mounting button (not shown) in button receptacle 666 and to receive
a rearview mirror on ball 662, 762. A lower portion of the
attachment member is defined by the lower periphery 670, lower
chamber 672 and lower cavity 673. The ribs 671 are provided to
allow the attachment member to function as a substitute for the
retainer 445, 545 when combined with an appropriately designed
interposing member such as a piece of substantially elastic sheet.
An upper portion is defined by the button receptacles 666, the
accessory mount 665, an upper chamber 669, a threaded set screw
hole 668 and an upper cavity 667. The upper and lower portions are
preferably configured as shown in FIGS. 6 and 7 to maximize the
strength while minimizing the resulting attachment member thickness
in any given location. The thickness is desirably minimized to
conserve material and to reduce associated shrinkage and warpage
during manufacturing. Preferably, the attachment member is
manufactured from an injection molded zinc process. Preferably, a
mold is provided with a cavity that separates at least into four
sections (a cover half, ejector half, and two slides) such that
the, at least partially, solidified attachment member is ejected by
applying force to the ejection pins 660, 760 and ejection point
761. When so ejected, the attachment member is provided with a
clean mold separation line 763 on, at least, the ball 662, 762.
Preferably, molten zinc is injected into a mold via apertures in
the mold corresponding to mold fill locations 764. It should be
understood that the associated mold may have more or less sections
depending on the desired material and ability to reuse. It should
be understood that inserts may be provided for the mold section
portion that defines the upper and/or lower standoff lengths.
Thereby, the same mold section may be used to produce various angle
parts.
[0052] In a preferred embodiment, the attachment member is provided
with stiffeners 759 located proximate the fastener slots 457, 657,
757. Most preferably, the attachment member is provided with a
ground connector feature 758 for facilitating connection of the
ground connector (shown as element 1417 in FIG. 14) along with at
least one of the fasteners. It should be understood that alternate
ground connector features may be provided.
[0053] As can be seen from FIGS. 4, 5, 6 and 7, the attachment
member, in part, defines the relationship which the image sensor
defines with respect to an associated field of view. The
corresponding angle may be altered by changing the angle at which
the upper portion of the attachment member defines with respect to
the lower portion, varying the length of the registration portions
of the carrier/baffle, providing shims of differing thicknesses, or
any combination thereof. It should be apparent that other
modifications may be made to vary the resulting imager aim. A
windshield sealing boot (shown as element 1389, 1489 in FIGS. 13
and 14, respectively) may be provided to impede nuisance buildup on
the transparent cover, such as, dust, windshield cleaner spray,
moisture and the like.
[0054] It should be understood that materials other than zinc may
be used for the attachment member such as steel, steel alloys,
aluminum, aluminum alloy, rigid plastics, polymers, magnesium,
magnesium alloys and the like. It is within the scope of the
present invention to use composite materials such as fiber glass,
fiber reinforced plastics, etc.
[0055] Turning now to FIGS. 9 and 10, there are shown exploded,
perspective, views of a rearview mirror assembly 900, 1000. In a
preferred embodiment, the rearview mirror assembly provides a rigid
structure for mounting an interior rearview mirror along with an
imager board. As will be described herein, the preferred accessory
and rearview mirror mount assembly facilitates ease of assembly as
well as provides for repeatable, reliable and precise alignment of
the related components. In at least one embodiment, the associated
imager is used for automatic exterior vehicle light control for
which precision alignment of the imager is preferred.
[0056] Imager board 910, 1010 is provided with an image sensor with
lens. In a preferred embodiment, the imager board will also include
an image sensor control logic and timing circuit, communication
line drivers and wire harness receptacle 913. Optionally, the
imager board may comprise a processor for receiving and, at least
partially, processing images obtained from the image sensor. In a
preferred embodiment, the image sensor and at least one other
device selected from the group comprising; 1) an image sensor
control logic; 2) an A/D converter; 3) a low voltage differential
signal line driver; 4) a temperature sensor; 5) a control output;
6) a voltage regulator; 7) a second image sensor; 8) a
microprocessor; 9) a moisture sensor and 10) a compass are
integrated in a common ASIC, most preferably on a common silicon
wafer. Preferably, the image sensor with lens includes lens cover
snap portions for engaging lens cover 920, 1020 snap clips. The
lens cover has an aperture for alignment with the image sensor and
lens.
[0057] An imager board wiring harness (not shown) is preferably
provided with plugs on either end thereof. The imager board is
preferably provided with a male receptacle 913 for receiving one of
the plugs of the imager board wiring harness.
[0058] In a preferred assembly method, an imager board and an
imager board wiring harness are provided and the wiring harness is
plugged into the associated receptacle 913. The lens cover is
snapped onto the lens and the imager board is placed on the
carrier/baffle such that alignment pins are received within
alignment holes such that the imager with lens and lens cover are
aligned with the baffle aperture. Preferably, the alignment pins
and, or, holes are slightly tapered such that the pins are
initially freely received within the alignment holes then become
snug once the imager board is pressed into place upon the
carrier/baffle. Preferably, the lens cover is further secured in
place by the lens cover retainers. It should be understood that the
baffle may be a separate part that snaps in place on a separate
carrier.
[0059] Once the imager board is in place upon the carrier/baffle,
the imager board retainer 945, 1045 is placed such that the imager
board and compass sensor board are retained upon the
carrier/baffle. Preferably, the imager board retainer comprises
hinge portions that are received within the hinge receptacles with
the imager board retainer substantially perpendicular to the
carrier/baffle. The imager board retainer is preferably then
pivoted around the hinge portions such that the clip portions are
received within clip receptacles and retained therein via
interlocking clips. It should be understood that the imager board
retainer may be configured to snap in place at four points in lieu
of the hinge portions on one end.
[0060] A far field baffle is preferably snapped onto the
carrier/baffle such that the aperture is aligned with the baffle
aperture and such that the far field baffle snap clips are engaged
with far field snap portions on either side of the baffle. The far
field baffle, in part, defines the field of view of the associated
image sensor.
[0061] The carrier/baffle 930, 1030 is placed proximate the
attachment member 955, 1055 such that the registration portions are
received within registration receptacles. Once the carrier/baffle
is aligned with the attachment member the four fasteners 975, 1075
are placed through fastener slots 957, 1057 and received within
fastener receptacles to secure the carrier/baffle to the attachment
member. Preferably, the fasteners are threaded screws and the
fastener receptacles are provided with mating threads. Optionally,
the fasteners and fastener receptacles may be configured with
interference fit functionality such that the fasteners are pressed
into the fastener receptacles. It should be understood that the
carrier/baffle may be configured to snap onto the attachment member
in lieu of using fasteners.
[0062] The transparent cover 980, 1080 is attached to the front
housing 985, 1085 such that the transparent cover is fixed to the
front housing to close the aperture 986, 1086. The transparent
cover may be assembled with a spring clip 981 using housing
interlocks (shown as elements 1581a, 1581b in FIG. 15) and spring
clip interlocks (shown as elements 1589a, 1589b in FIG. 15).
Preferably, the transparent cover is substantially transparent to
light rays in the visible spectrum, however, incorporates an
infrared and, or, ultra violet spectral filter characteristic.
Thereby, substantially blocking infrared and, or, ultra violet
light rays from impinging upon the image sensor. Front housing 985,
1085 is preferably provided with a recessed periphery with a snap
interlock to engage an inner perimeter with snap interlock, of rear
housing portions 990, 991, 1090, 1091. The front housing and rear
housing portions combine to define an enclosure.
[0063] Turning now to FIGS. 11 and 12, there are shown exploded,
perspective, views of an accessory and rearview mirror mount
assembly 1105, 1205. In a preferred embodiment, the accessory and
rearview mirror mount assembly provides a rigid structure for
mounting an interior rearview mirror along with an imager board. As
will be described herein, the preferred accessory and rearview
mirror mount assembly facilitates ease of assembly as well as
provides for repeatable, reliable and precise alignment of the
related components. In at least one embodiment, the associated
image sensor is used for automatic vehicle exterior light control
for which precision alignment of the image sensor is preferred.
[0064] Imager board 1110, 1210 is provided with an image sensor
with lens. In a preferred embodiment, the imager board will also
include an image sensor control logic and timing circuit,
communication line drivers and wire harness receptacle 1113.
Optionally, the imager board may comprise a processor for receiving
and, at least partially, processing images obtained from the image
sensor. In a preferred embodiment, the image sensor and at least
one other device selected from the group comprising; 1) an image
sensor control logic; 2) an A/D converter; 3) a low voltage
differential signal line driver; 4) a temperature sensor; 5) a
control output; 6) a voltage regulator; 7) a second image sensor;
8) a microprocessor; 9) a moisture sensor and 10) a compass are
integrated in a common ASIC, most preferably on a common silicon
wafer. Preferably, the image sensor with lens includes lens cover
snap portions for engaging lens cover 1120, 1220 snap clips. The
lens cover has an aperture for alignment with the image sensor and
lens.
[0065] An imager board wiring harness is preferably provided with
plugs on either end thereof. The imager board is preferably
provided with a male receptacle 1113 for receiving one of the plugs
of the imager board wiring harness.
[0066] In a preferred assembly method, an imager board and an
imager board wiring harness are provided and the wiring harness is
plugged into the associated receptacle 1113. The lens cover is
snapped onto the lens and then the imager board is placed on the
carrier/baffle such that alignment pins are received within
alignment holes such that the imager with lens and lens cover are
aligned with the baffle aperture. Preferably, the alignment pins
and, or, holes are slightly tapered such that the pins are
initially freely received within the alignment holes then become
snug once the imager board is pressed into place upon the
carrier/baffle. Preferably, the lens cover is further secured in
place by lens cover retainers. It should be understood that the
baffle may be a separate part that snaps in place on a separate
carrier.
[0067] Once the imager board is in place upon the carrier/baffle,
the imager board retainer 1145, 1245 is placed such that the imager
board and compass sensor board are retained upon the
carrier/baffle. Preferably, the imager board retainer comprises
hinge portions that are received within the hinge receptacles with
the imager board retainer substantially perpendicular to the
carrier/baffle. The imager board retainer is preferably then
pivoted around the hinge portions such that the clip portions are
received within clip receptacles and retained therein via
interlocking clips. It should be understood that the imager board
retainer may be configured to snap in place at four points in lieu
of the hinge portions on one end.
[0068] A far field baffle 1150,1250 is snapped onto the
carrier/baffle such that the aperture is aligned with the baffle
aperture and such that the far field baffle snap clips are engaged
with far field snap portions on either side of the baffle. The far
field baffle, in part, defines the field of view of the associated
image sensor.
[0069] The carrier/baffle 1130,1230 is placed proximate the
attachment member 1155, 1255 such that the registration portions
are received within registration receptacles. Once the
carrier/baffle is aligned with the attachment member, the four
fasteners 1175, 1275 are placed through fastener slots and received
within fastener receptacles to secure the carrier/baffle to the
attachment member. Preferably, the fasteners are threaded screws
and the fastener receptacles are provided with mating threads.
Optionally, the fasteners and fastener receptacles may be
configured with interference fit functionality such that the
fasteners are pressed into the fastener receptacles. It should be
understood that the carrier/baffle may be configured to snap onto
the attachment member in lieu of using fasteners.
[0070] The transparent cover 1180, 1280 is attached to the front
housing 1185, 1285 such that the transparent cover is fixed to the
front housing to close the aperture 1186. The transparent cover may
be assembled with a spring clip 1181 using housing interlocks
(shown as elements 1581a, 1581b in FIG. 15) and spring clip
interlocks (shown as elements 1589a, 1589b in FIG. 15). Preferably,
the transparent cover is substantially transparent to light rays in
the visible spectrum, however, incorporates an infrared and, or,
ultra violet spectral filter characteristic. Thereby, substantially
blocking infrared and, or, ultra violet light rays from impinging
upon the image sensor. Front housing 1185, 1285 is preferably
provided with a recessed periphery with snap interlock to engage an
inner perimeter with snap interlock, of a rear housing. The front
housing and rear housing 1190, 1290 combine to define an
enclosure.
[0071] The accessory and rearview mirror mount assembly 1105, 1205
embodiment depicted in FIGS. 11, and 12 is configured to mount to
an overhead console area of a controlled vehicle in lieu of being
configured to mount on a windshield button. The embodiment of FIGS.
11 and 12 comprises a mount 1160, a gasket 1161, trigger wires
1162, mounting pins 1163, compression spring 1164, a detach plate
1165, an extension bracket 1166 and detach plate fasteners 1177
that cooperate to mount the accessory and rearview mirror mount
assembly to the overhead consol area.
[0072] Turning now to FIGS. 13 and 14, there are shown exploded,
perspective, views of an accessory and rearview mirror mount
assembly 1305, 1405. In a preferred embodiment, the accessory and
rearview mirror mount assembly provides a rigid structure for
mounting an interior rearview mirror along with an imager board and
a compass board. As will be described herein, the preferred
accessory and rearview mirror mount assembly facilitates ease of
assembly as well as provides for reliable, precise, alignment of
the related components. In at least one embodiment, the associated
imager is used for automatic exterior vehicle light control for
which precision alignment of the imager is preferred.
[0073] Imager board 1310, 1410 is provided with an image sensor
with lens 1311. In a preferred embodiment, the imager board will
also include an image sensor control logic and timing circuit,
communication line drivers and wire harness receptacle 1313.
Optionally, the imager board may comprise a processor for receiving
and, at least partially, processing images obtained from the image
sensor. In a preferred embodiment, the image sensor and at least
one other device selected from the group comprising; 1) an image
sensor control logic; 2) an A/D converter; 3) a low voltage
differential signal line driver; 4) a temperature sensor; 5) a
control output; 6) a voltage regulator; 7) a second image sensor;
8) a microprocessor; 9) a moisture sensor and 10) a compass are
integrated in a common ASIC, most preferably on a common silicon
wafer. Preferably, the image sensor with lens 1311 includes lens
cover snap portions 1312 for engaging lens cover 1320, 1420 snap
clips 1321. The lens cover has an aperture 1322 for alignment with
the image sensor and lens.
[0074] Imager board wiring harness 1315, 1415 is preferably
provided with plugs 1316 on either end thereof. In a preferred
embodiment, the imager board wiring harness comprises nine pin
plugs and receptacles with all nine pins aligned in a common plane.
The imager board wiring harness preferably comprises seven
similarly sized individually insulated conductors bundled together
with a larger insulated ground conductor spirally wound around the
seven conductors with a shielded outer jacket placed over the seven
conductors and the ground wire. Preferably, the seven wires are all
terminated within an associated plug, on the end opposite the
imager board receptacle end, with a grounded connection on pins 1
and 6, a positive data clock connection on pin 2, a negative data
clock on pin 3, an unregulated positive 12 volt connection on pin
4, an unregulated 12 volt reference connection on pin 5, positive
data connection on pin 7 and a negative data connection on pin 8.
Preferably, the imager board receptacle end of the imager board
wiring harness is identical to the opposite end except for the fact
that the larger insulated ground wire is not terminated in the
plug, it is instead terminated with a ground connector 1317, 1417.
It should be understood that an imager board wiring harness can be
configured to route through the pivot ball and stem mounting the
rearview mirror housing to the attachment member such that the
wiring harness is substantially hidden from view.
[0075] As shown in FIG. 14, a compass sensor board 1325, 1425 is
provided with a compass wiring harness 1426 with plug/receptacle
1427. In a preferred embodiment, the compass wiring harness 1426 is
provided with a plug on both ends. In a preferred embodiment, the
compass wiring harness comprises four similarly sized, individually
insulated, conductors with a jacket surrounding the bundled
conductors. Preferably, all four conductors are terminated in a
plug on either end.
[0076] In a preferred assembly method, a compass sensor board and a
compass board wiring harness are provided and the wiring harness is
plugged into the associated receptacle. An imager board and an
imager board wiring harness are provided and the wiring harness is
plugged into the associated receptacle. The compass sensor board is
then placed within compass board receptacle 1442 of the
carrier/baffle 1330, 1430. The lens cover is snapped onto the lens
and then the imager board is placed on the carrier/baffle such that
the alignment pins 1431 are received within the alignment holes
1414 such that the imager with lens and lens cover are aligned with
the baffle aperture. Preferably, the alignment pins and, or, holes
are slightly tapered such that they are initially freely received
within the alignment holes then become snug once the imager board
is pressed into place upon the carrier/baffle. Preferably, the lens
cover is further secured in place by the lens cover retainers. It
should be understood that the baffle may be a separate part that
snaps in place on a separate carrier.
[0077] Once the compass sensor board and imager board are in place
upon the carrier/baffle, the imager board retainer 1345, 1445 is
placed such that the imager board and compass sensor board are
retained upon the carrier/baffle. Preferably, the imager board
retainer comprises hinge portions 1346, 1446 that are received
within the hinge receptacles 834 with the imager board retainer
substantially perpendicular to the carrier/baffle. The imager board
retainer is preferably then pivoted around the hinge portions such
that the clip portions 1347, 1447 are received within clip
receptacles and retained therein via interlocking clips. It should
be understood that the imager board retainer may be configured to
snap in place at four points in lieu of the hinge portions on one
end.
[0078] A far field baffle 1350, 1450 is snapped onto the
carrier/baffle such that the aperture 1352, 1452 is aligned with
the baffle aperture and such that the far field baffle snap clips
1351, 1451 are engaged with far field snap portions on either side
of the baffle. The far field baffle, in part, defines the field of
view of the associated image sensor.
[0079] The carrier/baffle 1330, 1430 is placed proximate the
attachment member 1355, 1455 such that the registration portions
are received within the registration receptacles 1356, 1456. Once
the carrier/baffle is aligned with the attachment member and the
compass board wiring harness is threaded through the lower aperture
the four fasteners 1375, 1475 are placed through fastener slots
1357, 1457 and received within fastener receptacles to secure the
carrier/baffle to the attachment member. Preferably, the fasteners
are threaded screws and the fastener receptacles are provided with
mating threads. Optionally, the fasteners and fastener receptacles
may be configured with interference fit functionality such that the
fasteners are pressed into the fastener receptacles. It should be
understood that the carrier/baffle may be configured to snap onto
the attachment member in lieu of using fasteners.
[0080] The transparent cover 1380, 1480 is attached to the front
housing 1385, 1485 such that the transparent cover is fixed to the
front housing to close the aperture 1386. Preferably, the
transparent cover is fixed to the front cover with heat staking
and/or adhesive. Alternately, the transparent cover may be
integrally molded with the front housing, assembled with spring
clips or use of a elastic boot. Preferably, the transparent cover
is substantially transparent to light rays in the visible spectrum,
however, incorporates an infrared and, or, ultra violet spectral
filter characteristic. Thereby, substantially blocking infrared
and, or, ultra violet light rays from impinging upon the image
sensor. Front housing 1385, 1485 is preferably provided with a
recessed periphery with snap interlock 1387, 1487 to engage an
inner perimeter with snap interlock 1393, of a rear housing 1390,
1490. The front housing and rear housing combine to define an
enclosure.
[0081] Turning now to FIG. 15, there is shown a front housing 1585
having an aperture 1586, a recessed periphery with snap interlock
1587, part match pins 1591 and spring clip interlocks 1589a, 1589b.
A transparent cover 1580 is retained in a desire position proximate
the front housing aperture via a spring clip 1581. The spring clip
has housing interlocks 1581a, 1581b for receiving the spring clip
interlocks 1589a, 1589b, respectively. Preferably, the spring clip
is bowed slightly to improve the transparent cover retention
abilities.
[0082] FIGS. 16a and 16b depict actual results of data relating to
the alignment of image sensors installed in two different
controlled vehicle types. The variations shown are for vehicles of
the same type compared to one another. It is preferably to maintain
an overall sensor field of view within a .+-.2.5 degree range from
a nominal design value.
[0083] Turning now to FIGS. 17 through 21, automatic vehicle
exterior light control system is discussed with respect to image
sensor alignment. Some performance effects associated with image
sensor alignment are image sensor optical axis shifts from centroid
of light distribution, image sensor field of view limited
horizontally and image sensor field of view limited vertically.
FIG. 17 depicts how the field of view differs with respect to image
sensor alignment.
[0084] FIG. 18 depicts a summary of data relating to detected
taillights of leading vehicles during actual operation of an
embodiment of the present invention. FIG. 19 depicts a summary of
data relating to detected headlights of oncoming vehicles during
actual operation of an embodiment of the present invention.
[0085] Automatic vehicle exterior light control system performance
may be effected by shifts in the image sensor optical axis. When
misalignment is present, often even the most frequently encountered
light sources will not be focused in the correct pixel zones
expected by the corresponding image analysis algorithms. Algorithms
to self calibrate the alignment of the image sensor with the
longitudinal axis of the vehicle may be provided to correct for
minor misalignment when pixels around the perimeter of the imager
are so configured. It should be understood that a mechanical image
sensor repositioning means may be provided that allows either
automatic and, or, manual image sensor alignment. The automatic
means may comprise inputs from other controlled vehicle equipment
such as pitch sensors, yaw sensors, turning sensors, breaking
sensors, acceleration sensors, load sensors, etc. In plant
calibration and, or, dynamic calibration means may be provided.
[0086] Automatic vehicle exterior light control system performance
may be impacted when the field of view of the image sensor is
limited horizontally. When misalignment is present reduced curve
performance often is experienced, high beam headlight glare to
passing vehicles is often experienced and high beam headlights
often return to full brightness and, or, incorrect aim before an
on-coming car is past. Table 5 and 6 and FIGS. 20 and 21 depict the
effects of limiting the horizontal view of an image sensor in an
automatic vehicle exterior light control system.
5TABLE 5 Curved Road Performance in Feet - Detection Distance No
0.75 Deg 1.50 Deg 3.0 Deg 5.0 Deg Rotation Rot Rot Rot Rot 1640 ft
Radius 530 484 436 326 Curve (500 m) 3280 ft Radius 1148 1066 982
810 558 Curve (1000 m) 4921 ft Radius 1758 1637 1516 1271 927 Curve
(1500 m)
[0087]
6TABLE 6 Straight Road Performance No 0.75 1.5 3 5 Rotation Deg Rot
Deg Rot Deg Rot Deg Rot Comments Distance to FOV 54.02 58.80 61.96
70.59 87.29 Assume standard two lane road 4 m wide Limit (feet)
Overtaken by 5 mph 7.37 8.02 8.45 9.63 11.9 Seconds to detect
passing vehicle Overtaken by 10 mph 3.68 4.01 4.22 4.81 5.95
Seconds to detect passing vehicle Overtaken by 15 mph 2.46 2.67
2.82 3.21 3.97 Seconds to detect passing vehicle On-coming - 25 mph
0.74 0.8 0.84 0.96 1.19 Seconds from loss of detection until
vehicle passes On-coming - 35 mph 0.53 0.57 0.6 0.69 0.85 Seconds
from loss of detection until vehicle passes On-coming - 45 mph 0.41
0.45 0.47 0.53 0.66 Seconds from loss of detection until vehicle
passes On-coming - 55 mph 0.33 0.36 0.38 0.44 0.54 Seconds from
loss of detection until vehicle passes On-coming - 65 mph 0.28 0.31
0.33 0.37 0.46 Seconds from loss of detection until vehicle
passes
[0088] Automatic vehicle exterior light control system performance
may be effected by limiting the image sensor vertical field of
view. Reduced hill performance is often experienced. It is
difficult to quantify loss in performance because headlamp light
output varies greatly through vertical angles.
[0089] The above description is considered that of the preferred
embodiments only. Modifications of the invention will occur to
those skilled in the art and to those who make or use the
invention. Therefore, it is understood that the embodiments shown
in the drawings and described above are merely for illustrative
purposes and not intended to limit the scope of the invention,
which is defined by the following claims as interpreted according
to the principles of patent law, including the doctrine of
equivalents.
* * * * *