U.S. patent number 3,765,502 [Application Number 05/258,520] was granted by the patent office on 1973-10-16 for automatic vehicle door lock circuit.
This patent grant is currently assigned to General Motors Corporation. Invention is credited to Douglas E. Mark.
United States Patent |
3,765,502 |
Mark |
October 16, 1973 |
AUTOMATIC VEHICLE DOOR LOCK CIRCUIT
Abstract
An automatic vehicle door lock circuit for automatically locking
the doors at a predetermined speed. A set signal, produced upon the
energization of this circuit, triggers a bistable multivibrator
memory circuit to the condition which produces a door unlock signal
upon the output thereof. An electrical vehicle speed signal,
produced when the vehicle has reached the predetermined speed, and
the door unlocked signal are applied across the emitter-base
electrodes of a type PNP transistor which, in combination with
another type PNP transistor, produce an electrical lock doors
signal of a predetermined duration. Another type PNP transistor,
responsive to this lock doors signal, completes an energizing
circuit for the lock solenoids in each of the vehicle doors to
operate the lock mechanism thereof to the door locked condition. At
the conclusion of the lock doors signal, a doors locked signal is
produced to trigger the bistable multivibrator memory circuit to
the condition which removes the door unlocked signal from the
output thereof.
Inventors: |
Mark; Douglas E. (Davison,
MI) |
Assignee: |
General Motors Corporation
(Detroit, MI)
|
Family
ID: |
22980918 |
Appl.
No.: |
05/258,520 |
Filed: |
June 1, 1972 |
Current U.S.
Class: |
180/281;
70/264 |
Current CPC
Class: |
E05B
77/54 (20130101); G01P 1/103 (20130101); G01P
3/4807 (20130101); Y10T 70/65 (20150401) |
Current International
Class: |
G01P
1/10 (20060101); G01P 1/00 (20060101); E05B
65/42 (20060101); G01P 3/42 (20060101); G01P
3/48 (20060101); B60r 021/00 () |
Field of
Search: |
;180/107,111,112,113,114
;70/264 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Knowles; Allen N.
Claims
What is claimed is:
1. An automatic vehicle door lock circuit for automatically locking
the vehicle doors when the vehicle has reached a predetermined
speed comprising in combination with a source of direct current
potential, a lock and an unlock solenoid for each door which
operate the lock mechanism of that door to the locked and unlocked
conditions, respectively, and a manually operable door lock switch
for selectively energizing said lock and unlock solenoids from said
source of direct current potential, a memory circuit having first
and second input circuits and an output circuit responsive to the
application of an electrical signal across a selected one of said
input circuits for producing an electrical door unlocked signal
upon said output circuit and to the application of an electrical
signal across the other one of said input circuits for removing
said door unlocked signal from said output circuit, means for
producing an electrical vehicle speed signal when said vehicle has
reached said predetermined speed, means responsive to said door
unlocked signal and said vehicle speed signal for producing an
electrical lock doors signal of a predetermined duration, means
responsive to said lock doors signal for completing an energizing
circuit for said lock solenoids in parallel across said source of
direct current potential, means responsive to the end of said lock
doors signal for producing an electrical doors locked signal, and
means for applying said doors locked signal across the said other
one of said input circuits of said memory circuit.
2. An automatic vehicle door lock circuit for automatically locking
the vehicle doors when the vehicle has reached a predetermined
speed comprising in combination with a source of direct current
potential, a lock and an unlock solenoid for each door which
operate the lock mechanism of that door to the locked and unlocked
conditions, respectively, and a manually operable door lock switch
for selectively energizing said lock and unlock solenoids from said
source of direct current potential, a memory circuit having first
and second input circuits and an output circuit responsive to the
application of an electrical signal across a selected one of said
input circuits for producing an electrical door unlocked signal
upon said output circuit and to the application of an electrical
signal across the other one of said input circuits for removing
said door unlocked signal from said output circuit, means for
producing an electrical set signal, means for applying said set
signal across the said selected one of said input circuits of said
memory circuit, means for producing an electrical vehicle speed
signal when said vehicle has reached said predetermined speed,
means responsive to said door unlocked signal and said vehicle
speed signal for producing an electrical lock doors signal of a
predetermined duration, means responsive to said lock doors signal
for completing an energizing circuit for said lock solenoids in
parallel across said source of direct current potential, means
responsive to the end of said lock doors signal for producing an
electrical doors locked signal, and means for applying said doors
locked signal across the said other one of said input circuits of
said memory circuit.
3. An automatic vehicle door lock circuit for automatically locking
the vehicle doors when the vehicle has reached a predetermined
speed comprising in combination with a source of direct current
potential, a lock and an unlock solenoid for each door which
operate the lock mechanism of that door to the locked and unlocked
conditions, respectively, and a manually operable door lock switch
for selectively energizing said lock and unlock solenoids from said
source of direct current potential, a memory circuit having first
and second input circuits and an output circuit responsive to the
application of an electrical signal across a selected one of said
input circuits for producing an electrical door unlocked signal
upon said output circuit and to the application of an electrical
signal across the other one of said input circuits for removing
said door unlocked signal from said output circuit, means for
producing an electrical vehicle speed signal when said vehicle has
reached said predetermined speed, means responsive to said door
unlocked signal and said vehicle speed signal for producing an
electrical lock doors signal of a predetermined duration, means
responsive to said lock doors signal for completing an energizing
circuit for said lock solenoids in parallel across said source of
direct current potential, means responsive to the end of said lock
doors signal for producing an electrical doors locked signal, means
for applying said doors locked signal across the said other one of
said input circuits of said memory circuit, means responsive to the
energization of said unlock solenoids through one of said manually
operable door lock switches for producing an electrical unlock
solenoid energized signal, means responsive to the closing of any
one of said vehicle doors for producing an electrical door opened
signal, and means for applying said unlock solenoid energized
signal and said door opened signal across the said selected one of
said input circuits of said memory circuit.
4. An automatic vehicle door lock circuit for automatically locking
the vehicle doors when the vehicle has reached a predetermined
speed comprising in combination with a source of direct current
potential, a lock and an unlock solenoid for each door which
operate the lock mechanism of that door to the locked and unlocked
conditions, respectively, and a manually operable door lock switch
for selectively energizing said lock and unlock solenoids from said
source of direct current potential, a memory circuit having first
and second input circuits and an output circuit responsive to the
application of an electrical signal across a selected one of said
input circuits for producing an electrical door unlocked signal
upon said output circuit and to the application of an electrical
signal across the other one of said input circuits for removing
said door unlocked signal from said output circuit, means for
producing an electrical set signal, means for applying said set
signal across the said selected one of said input circuits of said
memory circuit, means for producing an electrical vehicle speed
signal when said vehicle has reached said predetermined speed,
means responsive to said door unlocked signal and said vehicle
speed signal for producing an electrical lock doors signal of a
predetermined duration, means responsive to said lock doors signal
for completing an energizing circuit for said lock solenoids in
parallel across said source of direct current potential, means
responsive to the end of said lock doors signal for producing an
electrical doors locked signal, means for applying said doors
locked signal across the said other one of said input circuits of
said memory circuit, means responsive to the energization of said
unlock solenoids through one of said manually operable door lock
switches for producing an electrical unlock solenoid energized
signal, means responsive to the closing of any one of said vehicle
doors for producing an electrical door opened signal, and means for
applying said unlock solenoid energized signal and said door opened
signal across the said selected one of said input circuits of said
memory circuit.
5. An automatic vehicle door lock circuit for automatically locking
the vehicle doors when the vehicle has reached a predetermined
speed comprising in combination with a source of direct current
potential, a lock and an unlock solenoid for each door which
operate the lock mechanism of that door to the locked and unlocked
conditions, respectively, and a manually operable door lock switch
for selectively energizing said lock and unlock solenoids from said
source of direct current potential, a bistable multivibrator
circuit having first and second input circuits and an output
circuit responsive to the application of an electrical signal
across a selected one of said input circuits for producing an
electrical door unlocked signal upon said output circuit and to the
application of an electrical signal across the other one of said
input circuits for removing said door unlocked signal from said
output circuit, means for producing an electrical vehicle speed
signal when said vehicle has reached said predetermined speed,
means responsive to said door unlocked signal and said vehicle
speed signal for producing an electrical lock doors signal of a
predetermined duration, means responsive to said lock doors signal
for completing an energizing circuit for said lock solenoids in
parallel across said source of direct current potential, means
responsive to the end of said lock doors signal for producing an
electrical doors locked signal, and means for applying said doors
locked signal across the said other one of said input circuits of
said bistable multivibrator circuit.
6. An automatic vehicle door lock circuit for automatically locking
the vehicle doors when the vehicle has reached a predetermined
speed comprising in combination with a source of direct current
potential, a lock and an unlock solenoid for each door which
operate the lock mechanism of that door to the locked and unlocked
conditions, respectively, and a manually operable door lock switch
for selectively energizing said lock and unlock solenoids from said
source of direct current potential, a bistable multivibrator
circuit having first and second input circuits and an output
circuit responsive to the application of an electrical signal
across a selected one of said input circuits for producing an
electrical door unlocked signal upon said output circuit and to the
application of an electrical signal across the other one of said
input circuits for removing said door unlocked signal from said
output circuit, means for producing an electrical set signal, means
for applying said set signal across the said selected one of said
input circuits of said bistable multivibrator circuit, means for
producing an electrical vehicle speed signal when said vehicle has
reached said predetermined speed, means responsive to said door
unlocked signal and said vehicle speed signal for producing an
electrical lock doors signal of a predetermined duration, means
responsive to said lock doors signal for completing an energizing
circuit for said lock solenoids in parallel across said source of
direct current potential, means responsive to the end of said lock
doors signal for producing an electrical doors locked signal, and
means for applying said doors locked signal across the said other
one of said input circuits of said bistable multivibrator
circuit.
7. An automatic vehicle door lock circuit for automatically locking
the vehicle doors when the vehicle has reached a predetermined
speed comprising in combination with a source of direct current
potential, a lock and an unlock solenoid for each door which
operate the lock mechanism of that door to the locked and unlocked
conditions, respectively, and a manually operable door lock switch
for selectively energizing said lock and unlock solenoids from said
source of direct current potential, a bistable multivibrator
circuit having first and second input circuits and an output
circuit responsive to the application of an electrical signal
across a selected one of said input circuits for producing an
electrical door unlocked signal upon said output circuit and to the
application of an electrical signal across the other one of said
input circuits for removing said door unlocked signal from said
output circuit, means for producing an electrical set signal, means
for applying said set signal across the said selected one of said
input circuits of said bistable multivibrator circuit, means for
producing an electrical vehicle speed signal when said vehicle has
reached said predetermined speed, means responsive to said door
unlocked signal and said vehicle speed signal for producing an
electrical lock doors signal of a predetermined duration, means
responsive to said lock doors signal for completing an energizing
circuit for said lock solenoids in parallel across said source of
direct current potential, means responsive to the end of said lock
doors signal for producing an electrical doors locked signal, means
for applying said doors locked signal across the said other one of
said input circuits of said bistable multivibrator circuit, means
responsive to the energization of said unlock solenoids through one
of said manually operable door lock switches for producing an
electrical unlock solenoid energized signal, means responsive to
the closing of any one of said vehicle doors for producing an
electrical door opened signal, and means for applying said unlock
solenoid energized signal and said door opened signal across the
said selected one of said input circuits of said bistable
multivibrator circuit.
8. An automatic vehicle door lock circuit for automatically locking
the vehicle doors when the vehicle has reached a predetermined
speed comprising in combination with a source of direct current
potential, a lock and an unlock solenoid for each door which
operate the lock mechanism of that door to the locked and unlocked
conditions, respectively, and a manually operable door lock switch
for selectively energizing said lock and unlock solenoids from said
source of direct current potential, a memory circuit having first
and second input circuits and an output circuit responsive to the
application of an electrical signal across a selected one of said
input circuits for producing an electrical door unlocked signal
upon said output circuit and to the application of an electrical
signal across the other one of said input circuits for removing
said door unlocked signal from said output circuit, means for
producing an electrical vehicle speed signal when said vehicle has
reached said predetermined speed, means responsive to said door
unlocked signal and said vehicle speed signal for producing an
electrical lock doors signal of a predetermined duration, means
responsive to said lock doors signal for completing an energizing
circuit for said lock solenoids in parallel across said source of
direct current potential, means responsive to the end of said lock
doors signal for producing an electrical doors locked signal, means
for applying said doors locked signal across the said other one of
said input circuits of said memory circuit, and means for
inhibiting said lock door signal while the transmission of said
vehicle is in the neutral position.
9. An automatic vehicle door lock circuit for automatically locking
the vehicle doors when the vehicle has reached a predetermined
speed comprising in combination with a source of direct current
potential, a lock and an unlock solenoid for each door which
operate the lock mechanism of that door to the locked and unlocked
conditions, respectively, and a manually operable door lock switch
for selectively energizing said lock and unlock solenoids from said
source of direct current potential, a memory circuit having first
and second input circuits and an output circuit responsive to the
application of an electrical signal across a selected one of said
input circuits for producing an electrical door unlocked signal
upon said output circuit and to the application of an electrical
signal across the other one of said input circuits for removing
said door unlocked signal from said output circuit, means for
producing an electrical set signal, means for applying said set
signal across the said selected one of said input circuits of said
memory circuit, means for producing an electrical vehicle speed
signal when said vehicle has reached said predetermined speed,
means responsive to said door unlocked signal and said vehicle
speed signal for producing an electrical lock doors signal of a
predetermined duration, means responsive to said lock doors signal
for completing an energizing circuit for said lock solenoids in
parallel across said source of direct current potential, means
responsive to the end of said lock doors signal for producing an
electrical doors locked signal, means for applying said doors
locked signal across the said other one of said input circuits of
said memory circuit, and means for inhibiting said lock doors
signal while the transmisson of said vehicle is in the neutral
position.
10. An automatic vehicle door lock circuit for automatically
locking the vehicle doors when the vehicle has reached a
predetermined speed comprising in combination with a source of
direct current potential, a lock and an unlock solenoid for each
door which operate the lock mechanism of that door to the locked
and unlocked conditions, respectively, and a manually operable door
lock switch for selectively energizing said lock and unlock
solenoids from said source of direct current potential, a memory
circuit having first and second input circuits and an output
circuit responsive to the application of an electrical signal
across a selected one of said input circuits for producing an
electrical door unlocked signal upon said output circuit and to the
application of an electrical signal across the other one of said
input circuits for removing said door unlocked signal from said
output circuit, means for producing an electrical set signal, means
for applying said set signal across the said selected one of said
input circuits of said memory circuit, means for producing an
electrical vehicle speed signal when said vehicle has reached said
predetermined speed, means responsive to said door unlocked signal
and said vehicle speed signal for producing an electrical lock
doors signal of a predetermined duration, means responsive to said
lock doors signal for completing an energizing circuit for said
lock solenoids in parallel across said source of direct current
potential, means responsive to the end of said lock doors signal
for producing an electrical doors locked signal, means for applying
said doors locked signal across the said other one of said input
circuits of said memory circuit, means responsive to the
energization of said unlock solenoids through one of said manually
operable door lock switches for producing an electrical unlock
solenoid energized signal, means responsive to the closing of any
one of said vehicle doors for producing an electrical door opened
signal, means for applying said unlock solenoid energized signal
and said door opened signal across said selected one of said input
circuits of said memory circuit, and means for inhibiting said lock
doors signal while the transmission of said vehicle is in the
neutral position.
Description
This invention is directed to an automatic vehicle door lock
circuit and, more specifically, to a circuit of this type which
automatically locks the vehicle doors when the vehicle has reached
a predetermined speed.
Each door of a vehicle is conventionally provided with a door
locking mechanism, each of which may be independently locked
manually from inside the vehicle, preferably by means of a garnish
molding button and, additionally, each front door may be locked
from the outside by means of a key.
To provide for the operation of the door locking mechanism to the
locked and unlocked conditions electrically, each door is provided
with a lock solenoid which, upon energization, operates the door
lock mechanism to the door locked condition and an unlock solenoid
which, upon energization, operates the door lock mechanism to the
door unlocked condition. To complete the energizing circuit for
each the lock and unlock solenoids, a single pole-double throw
electrical switch is installed on the inside of at least the two
front doors whereby all of the door locking mechanisms may be
electrically operated by either the driver or the front seat
passenger. Usually, but not necessarily always, the electrical
control of the lock mechanism of all doors originates in the front
doors, the lock and unlock solenoids of the rear doors being
followers only. That is, the lock solenoids and the unlock
solenoids of all of the vehicle doors may be energized by operating
the manually operable door lock switch mounted on the inside of
either the driver side front door or the passenger side front
door.
To prevent the unwarranted intrusion of the occupied vehicle
passenger compartment, for example when the vehicle is stopped in
abeyance of a traffic signal, it is desirable that all of the
vehicle door lock mechanisms be operated to the door locked
condition while the vehicle passenger compartment is occupied. As
the driver and/or the passenger may neglect to operate the lock
mechanism to the door locked condition, a circuit which
automatically locks the vehicle doors when the vehicle has reached
a predetermined speed is desirable.
It is, therefore, an object of this invention to provide an
improved automatic vehicle door lock circuit for automatically
locking the vehicle door when the vehicle has reached a
predetermined speed.
It is another object of this invention to provide an improved
automatic vehicle door lock circuit for automatically locking the
vehicle doors when the vehicle has reached a predetermined speed
which is provided with sensing circuitry for producing a door
unlocked signal upon the energization of any door unlock solenoids
and a door opened signal upon the opening and relosing of any one
of the vehicle doors after the lock mechanism has been
automatically energized.
It is an additional object of this invention to provide an improved
automatic vehicle door lock circuit for automatically locking the
vehicle doors when the vehicle has reached a predetermined speed
which is provided with a circuit for preventing the operation
thereof at any speed while the vehicle transmission is in
"Neutral."
It is a further object of this invention to provide an improved
automatic vehicle door lock circuit for automatically locking the
vehicle doors when the vehicle has reached a predetermined speed
which will automatically relock any door which has been unlocked
after the operation thereof while the vehicle is operating at or
greater than the predetermined speed.
In accordance with this invention, an improved automatic vehicle
door lock circuit for automatically locking the vehicle doors when
the vehicle has reached a predetermined speed is provided wherein
circuitry responsive to a door unlocked signal, produced upon the
initial energization of the circuitry of this invention or upon the
energization of any of the door unlock solenoids or upon the
reclosing of any one of the vehicle doors which has been opened
after the operation of the circuit of this invention, and a vehicle
speed signal, produced when the vehicle has reached the
predetermined speed, produces a lock doors signal of a
predetermined duration and circuitry responsive to the lock doors
signal completes an energizing circuit for all of the lock
solenoids in parallel to operate the lock mechanism of each vehicle
door to the locked condition .
For a better understanding of the present invention, together with
additional objects, advantages and features thereof, reference is
made to the following description and accompanying drawing in
which:
FIG. 1 schematically sets forth a portion of the automatic vehicle
door lock circuit of this invention and,
FIG. 2 schematically sets forth the remainder of the automatic
vehicle door lock circuit of this invention.
As is well known in the automotive art, the lock mechanism of each
vehicle door may be operated to the door locked condition by the
energization of an associated lock solenoid and may be operated to
the door unlocked condition by the energization of an associated
unlock solenoid upon the operation of manually operable, single
pole-double throw electrical door lock switches through which the
lock and unlock solenoids may be selectively energized from a
source of direct current potential, which may be the vehicle
storage battery 8 of FIG. 1. As electrically operable door lock
mechanisms are well known in the automotive art and, per se, form
no part of this invention, in the interest of reducing drawing
complexity, only the lock and unlock solenoids and the door lock
switches which cooperate with the automatic vehicle door lock
circuit of this invention have been shown in the drawing. In FIG.
2, the right and left front door lock solenoids have been
referenced by the numerals 10L and 11L, respectively, and the right
and left front door unlock solenoids have been referenced by the
numerals 10U and 11U, respectively. With four-door vehicles, the
right and left rear door lock solenoids and the right and left rear
door unlock solenoids may be connected in parallel with the front
door lock solenoids and the front door unlock solenoids,
respectively. In the interest of reducing drawing complexity, the
rear door lock and unlock solenoids are not shown in the drawing.
The right and left front door lock switches may be of the single
pole-double throw type having a movable contact and two stationary
contacts 17 and 18. In FIG. 2, the right front door lock switch 15
is shown to have a movable contact 16 and two stationary contacts
and the right front door lock switch 20 is shown to have a movable
contact 21 and two stationary contacts 22 and 23.
As point of reference or ground potential is the same point
electrically throughout the system, it has been illustrated in the
drawing by the accepted schematic symbol and referenced by the
numeral 5.
The movable contact 26 of a conventional automotive type ignition
switch 25 having a movable contact and three stationary contacts
27, 28 and 29, is connected to the positive polarity terminal of
battery 8 through lead 19. Ignition switch 25 may be a conventional
automotive type ignition switch having an "Off" position, in which
position it is shown in FIG. 1, a "Crank" position in which movable
contact 26 is in electrical contact with stationary contacts 28 and
29 and a "Run" position in which movable contact 26 is in
electrical contact with stationary contacts 27 and 28. Ignition
switches of this type are normally spring biased to automatically
return to the "Run" position from the "Crank" position upon the
release of torque upon the ignition key, in a manner well known in
the automotive art. While in the "Crank" position with the vehicle
transmission in the "Neutral" or "Park" position, the cranking
motor solenoid 30 is connected across battery 8 through lead 19,
movable contact 26 and stationary contact 29 of ignition switch 25,
lead 24, the closed contacts 32 and 33 of transmission neutral
switch 31 and point of reference or ground potential 5 and the
vehicle ignition circuit is connected across battery 8 through lead
19, movable contact 26 and stationary contact 28 of ignition switch
25. The transmission neutral switch 31 may be a conventional single
pole-single throw type electrical switch well known in the
automotive art which is operated to the electrical circuit closed
condition with movable contact 32 in electrical contact with
stationary contact 33 with the vehicle transmission shifted to
either the "Neutral" or "Park" position in a manner well known in
the automotive art. After the vehicle engine has been cranked and
is in the running mode, the torque on the ignition key is released
and movable contact 26 is spring biased to return to the "Run"
position in which it is in electrical contact with stationary
contacts 27 and 28 which maintains the ignition circuit energized
across battery 8 and also connects the accessory circuits and the
automatic vehicle door lock circuit of this invention across
battery 8.
In FIG. 1, the output potential of battery 8 is shown to be
regulated by series resistor 35 and Zener diode 36 connected across
stationary contact 27 of ignition switch 25 and point of reference
or ground potential 5. It is to be specifically understood that
this potential regulating arrangement is desirable but not
absolutely necessary for the practice of this invention.
While ignition switch 25 is in the "Run" position, movable contact
26 in electrical contact with stationary contacts 27 and 28,
vehicle door lock solenoids 10L and 11L of FIG. 2 may be energized
from battery 8 upon the operation of movable contact 16 of door
lock switch 15 into electrical contact with stationary contact 18
thereof or upon the operation of movable contact 21 of door lock
switch 20 into electrical contact with stationary contact 23
thereof, and vehicle door unlock solenoids 10U and 11U may be
energized from battery 8 upon the operation of movable contact 16
of door lock switch 15 into electrical contact with stationary
contact 17 thereof or upon the operation of movable contact 21 of
door lock switch 20 into electrical contact with stationary contact
22 thereof. This energizing circuit may be traced from battery 8,
through lead 19, movable contact 26 and stationary contact 27 of
ignition switch 25, lead 34(1) of FIG. 1, leads 34(2) and 37 of
FIG. 2, and either of door lock switches 15 and 20 to point of
reference or ground potential 5.
Upon the operation of movable contact 26 of ignition switch 25 into
electrical contact with stationary contact 27, the automatic
vehicle door lock circuit of this invention is energized by battery
8 through lead 19, movable contact 26, and stationary contact 27 of
ignition switch 25 and lead 39(1) of FIG. 1 and lead 39(2) of FIG.
2, upon which a regulated potential appears of a positive polarity
thereon with respect to point of reference or ground potential
5.
To determine whether the doors were last in a locked or unlocked
condition, a memory circuit having first and second input circuits
and an output circuit responsive to the application of an
electrical signal across a selected one of the input circuits for
producing an electrical door unlocked signal upon the output
circuit indicating at least one of the door lock mechanisms is in
the unlock condition and responsive to the application of an
electrical signal across the other one of the input circuits for
removing the door unlocked signal from the output circuit is
provided. This memory circuit may be a conventional bistable
multivibrator circuit, FIG. 2, of a type well known in the art
consisting of type NPN transistor 40 having the usual base 41,
collector 42 and emitter 43 electrodes and type NPN transistor 50
also having the usual base 51, collector 52 and emitter 53
electrodes and resistors 38 and 45. As the collector-emitter
electrodes are connected across the positive and negative polarity
terminals of battery 8 with ignition switch 25 in the "Run"
position through lead 39(2), respective collector resistors 44 and
54 and point of reference or ground potential 5, these type NPN
transistors are properly poled for forward collector-emitter
conduction therethrough. The input circuits of this bistable
multivibrator memory circuit are across the base electrode 41 of
transistor 40 and point of reference or ground potential 5 and
across the base electrode 51 of transistor 50 and point of
reference or ground potential 5 and the output circuit is the
collector electrode 52 of transistor 50.
With ignition switch 25 in the "Run" position, movable contact 26
in electrical contact with stationary contacts 27 and 28, a direct
current potential appears across lead 39(1) of FIG. 1 and 39(2) of
FIG. 2 of a positive polarity upon leads 39(1) and 39(2) with
respect to point of reference or ground potential 5. In FIG. 2, the
potential drop across base bias resistor 46 and current limiting
resistor 47 places the base electrode 61 of type PNP set signal
transistor 60 at a potential less positive than that present upon
the emitter electrode 62 thereof as there is no initial charge upon
capacitor 48. Consequently, emitter-base current flows through
transistor 60 until capacitor 48 has become charged. While
emitter-base current is flowing through transistor 60, an
electrical set signal current flows through the emitter electrode
62 and collector electrode 63 thereof, current limiting resistor 49
and the emitter-base electrodes of type NPN transistor 50 of the
bistable multivibrator memory circuit to point of reference or
ground potential 5. This electrical set signal current produces
base-emitter current flow through type NPN transistor 50 to trigger
this device conductive through the collector-emitter electrodes
thereof. Transistor 50 is maintained conductive after capacitor 48
has become charged by base-emitter current supplied through
collector resistor 44 and coupling resistor 38. With type NPN
transistor 50 conducting through the collector-emitter electrodes,
a ground potential door unlocked signal is present upon the output
circuit thereof at junction 55 to which base electrode 71 of type
PNP transistor 70 of FIG. 1 is connected through leads 56(2) of
FIG. 2 and 56(1) of FIG. 1 and current limiting resistor 57.
Member 65 of FIG. 1 may be any member which may be conveniently
rotated at a speed equal to or proportional to vehicle speed which
is arranged to carry a plurality of permanent magnets, four of
which are illustrated in FIG. 1 and referenced by the numerals 66,
67, 68 and 69. For example, member 65 may be a drum mounted upon
the vehicle driveshaft, it may be a member mounted upon the
transmission speed takeoff, or a member mounted upon any other
vehicle part which is rotated at a speed equal to or proportional
to vehicle speed. It is only necessary that the permanent magnets
rotated therewith are in operative relationship with normally open
contacts 76 and 77 of reed switch 75 to operate these contacts to
the electrical circuit closed condition at a frequency proportional
to vehicle speed by passing in close proximity thereto in a manner
well known in the reed switch art. While contacts 76 and 77 of reed
switch 75 are open, the potential upon junction 78 is of a positive
polarity with respect to point of reference or ground potential 5
and of a magnitude substantially equal to the magnitude of the
direct current potential appearing across lead 39(1) and point of
reference or ground potential 5. While the contacts 76 and 77 of
reed switch 75 are closed, the potential upon junction 78 is
substantially ground potential, the current flow through reed
switch 75 being limited by resistor 79. Consequently, a square
waveform signal appears across junction 78 and point of reference
potential 5 which is differentiated by capacitor 84 and resistor 85
to produce a positive and a negative polarity spike for each square
waveform signal separated by the width thereof upon junction 64
across resistor 85. Diode 86 permits only the positive polarity
spikes of this differentiated signal to be applied across
integrating capacitor 87. Consequently, capacitor 87 charges with
each positive polarity spike of the differentiated signal appearing
across resistor 85 and discharges through resistor 88 during the
periods between these positive polarity spikes. As the speed of the
vehicle increases, the period between the positive polarity spikes
of the signal appearing across resistor 85 decreases until
capacitor 87 becomes sufficiently charged to produce base-emitter
current flow through current limiting resistor 89 and the base
electrode 81 and emitter electrode 83 of type NPN transistor 80 to
trigger this device conductive through the collector electrode 82
and emitter electrode 83, in a manner well known in the transistor
art, this flow of current being limited by collector resistor 74.
The values of integrating capacitor 87 and resistor 88 are selected
to provide a time constant which permits integrating capacitor 87
to become sufficiently charged to a magnitude sufficient to produce
base-emitter current flow through type NPN transistor 80 when the
vehicle has reached the predetermined speed at which the doors
thereof are to be automatically locked. Conducting transistor 80
drains base drive current from the base electrode 91 of normally
conducting type NPN transistor 90 to extinguish the flow of current
through the collector electrode 92 and emitter electrode 93 of
transistor 90, consequently, the potential upon junction 95 goes
positive with respect to point of reference or ground potential 5
of magnitude substantially equal to the potential available upon
line 39(1). Transistor 90 is maintained not conductive through the
collector-emitter electrodes so long as the speed of the vehicle is
at or greater than the predetermined speed. A capacitor 59 is
connected across collector electrode 92 and base electrode 91 of
transistor 90 to provide hysteresis to this switching action when
low information rate speed signals are used. While transistor 90 is
not conductive, a vehicle speed potential signal appears across
junction 95 and point of reference or ground potential 5 which is
of a positive polarity upon junction 95 with respect to point of
reference or ground potential 5.
The positive polarity vehicle speed potential signal appearing
across junction 95 and point of reference or ground potential 5 is
of the proper polarity relationship to produce emitter-base current
flow through the emitter electrode 72 and base electrode 71 of type
PNP transistor 70, base bias resistor 96 placing base electrode 71
at a potential less positive than the emitter electrode 72, while
the ground potential door unlocked signal is present upon junction
55 of FIG. 2. The circuit may be traced from junction 95, through
the emitter-base electrodes of type NPN transistor 70, through
current limiting resistor 57 and lead 56(1) of FIG. 1, lead 56(2)
of FIG. 2 and the collector-emitter electrodes of transistor 50 of
the bistable multivibrator memory circuit to point of reference or
ground potential 5. This flow of emitter-base current through type
PNP transistor 70 triggers this device conductive through the
emitter electrode 72 and collector electrode 73 thereof. Base bias
resistor 98 places the base electrode 101 of type PNP transistor
100 at a potential less positive than that present upon the emitter
electrode 102 thereof while capacitor 99 is in a discharged state,
consequently, emitter-base current flows through type PNP
transistor 100 until capacitor 99 has become charged. This
emitter-base current triggers transistor 100 conductive through
emitter electrode 102 and collector electrode 103 to establish a
circuit for the flow of current from junction 95, through the
emitter-collector electrodes of transistor 70, the
emitter-collector electrodes of transistor 100 and resistors 104
and 105 in series to point of reference or ground potential 5. This
flow of current produces a lock doors potential signal across
resistor 105 which is of a positive polarity upon junction 97 with
respect to point of reference or ground potential 5 for the
duration of time required to charge capacitor 99. From this
description it is apparent that type PNP transistors 70 and 100 are
responsive to the ground potential door unlocked signal appearing
upon the output circuit, junction 55, of the bistable vibrator
memory circuit of FIG. 2 and to the vehicle speed potential signal
appearing across junction 95 of FIG. 1 and point of reference or
ground potential 5 to produce an electrical lock doors signal
across junction 97 and point of reference or ground potential 5 of
a predetermined duration as determined by the time-constant of the
parallel combination of resistor 98 and the emitter-base electrodes
of transistor 100 and current limiting resistor 106 in series and
capacitor 99.
As the lock doors signal appearing across junction 97 and point of
reference or ground potential 5 is applied across base electrode
111 and emitter electrode 113 of type NPN transistor 110 until
capacitor 99 has become charged in the proper polarity relationship
to produce base-emitter current flow through a type NPN transistor,
base-emitter current flows through type NPN transistor 110 for the
duration of the lock doors signal to trigger this device conductive
through the collector electrode 112 and emitter electrode 113. With
transistor 110 conducting through the collector-emitter electrodes,
a circuit is completed for the flow of current through the emitter
electrode 122 and base electrode 121 of type PNP transistor 120,
resistor 108 placing the base electrode 121 at a potential less
positive than emitter electrode 122, which may be traced from lead
34(1), lead 58, the emitter electrode 122 for producing base
electrode 121 of type PNP transistor 120, current limiting resistor
109 and the collector-emitter electrodes of transistor 110 to point
of reference or ground potential 5. The flow of emitter-base
current through transistor 120 triggers this device conductive
through the emitter electrode 122 and collector electrode 123 to
supply an energizing current for the operating coil 116 of a relay
115 having a normally open movable contact 117 and a stationary
contact 118. Upon the energization of operating coil 116 of relay
115, movable contact 117 is operated into electrical circuit closed
condition with stationary contact 118 thereof to complete an
energizing circuit for the lock solenoids of FIG. 2 which may be
traced from lead 34(1) of FIG. 1, leads 34(2) and 37 of FIG. 2,
lead 125(2) of FIG. 2, lead 125(1) of FIG. 1, the closed contacts
117 and 118 of relay 115, lead 126(1) of FIG. 1, lead 126(2) of
FIG. 2 and lock solenoids 10L and 11L in parallel to point of
reference or ground potential 5 to lock the vehicle doors when the
vehicle has reached the predetermined speed. Diode 119 quenches any
transients which may be generated by operating coil 116 as a result
of the switching action of transistor 120. From this description it
is apparent that transistors 110 and 120 are responsive to the lock
doors signal appearing across junction 97 and point of reference or
ground potential 5 for completing an energizing circuit for the
lock solenoids in parallel across the source of direct current
potential, battery 8.
For the duration of the lock doors signal appearing across junction
97 of FIG. 1 and point of reference or ground potential 5, the
potential upon junction 135, FIG. 1, is substantially ground. At
the conclusion of the duration of the lock doors signal when
capacitor 99 has become charged, emitter-base current ceases to
flow through the emitter-base electrodes of transistor 110 to
extinguish this device. When the transistor 110 extinguishes, the
circuit for emitter-base current flow through transistor 120 is
interrupted to extinguish this device which interrupts the
energizing circuit for operating coil 116 of relay 115 and a doors
locked potential signal appears upon junction 135 of a positive
polarity with respect to point of reference or ground potential 5
from line 34(1), line 58, series resistors 108 and 109, lead 127
and current limiting resistor 128. Diode 129 is a blocking diode
which prevents the potential appearing across Zener diode 36 and
point of reference or ground potential 5 from appearing upon
junction 135 when transistor 110 is conducting and also clamps
junction 135 to within one diode drop of the potential appearing
across Zener diode 36 and point of reference or ground potential 5
while transistor 110 is extinguished. This positive polarity doors
locked potential signal upon junction 135 is applied through lead
134(1) of FIG. 1, lead 134(2) of FIG. 2, differentiating capacitor
144, resistor 136, lead 138 across the other input circuit, base
electrode 41 and emitter electrode 43 of type NPN transistor 40, of
the bistable multivibrator memory circuit. Diode 137 prevents the
base electrode 41 of transistor 40 from going more than one diode
drop below ground potential by extinguishing all negative going
pulses from capacitor 144. This positive polarity doors locked
signal applied to the other input circuit of the bistable
multivibrator memory circuit produces base-emitter current flow
through type NPN transistor 40 to trigger this device conductive
through the collector-emitter electrodes. With transistor 40
conducting through the collector-emitter electrodes, base drive
current is drained from transistor 50 of the bistable multivibrator
memory circuit to extinguish this device. With transistor 50
extinguished, the door unlocked signal is removed from the output
circuit thereof as the potential upon junction 55 becomes positive
with respect to point of reference or ground potential 5. This
positive polarity signal is applied to the base electrode 71 of
type PNP transistor 70 of FIG. 1 through lead 56(2) of FIG. 2 and
lead 56(1) and resistor 57 of FIG. 1, a condition which
extinguishes transistor 70.
With transistor 40 of the bistable multivibrator circuit conducting
through the collector-emitter electrodes, a discharge circuit is
provided for capacitor 99 of FIG. 1, which may be traced from
junction 145, lead 146, current limiting resistor 147, blocking
diode 148 and lead 149(1) of FIG. 1 and lead 149(2) and the
collector-emitter electrodes of transistor 50 of FIG. 2 to point of
reference or ground potential 5. The discharge of capacitor 99
conditions the circuit of this invention to energize operating coil
116 of relay 115 upon the next appearance of a lock door signal
across junction 97 and point of reference or ground potential
5.
In the event the unlock solenoids should be energized through one
of the manually operable door lock switches 15 or 20 of FIG. 2 by
the operation of either movable contact 16 or 21 to the
corresponding respective stationary contacts 17 or 22, an
electrical unlock solenoid energized signal appears across junction
150 and point of reference or ground potential 5 of a positive
polarity upon junction 150 with respect to point of reference or
ground potential 5. This positive polarity unlock solenoid
energized signal is applied across the selected one of the input
circuits of the bistable multivibrator memory circuit, the
base-emitter electrodes of transistor 50, through diode 151,
differentiating capacitor 152 and resistor 153. Resistor 154
provides a discharge circuit for differentiating capacitor 152. As
this positive polarity unlock solenoid energized signal is of the
proper polarity relationship to produce base-emitter current flow
through a type NPN transistor, transistor 50 is triggered
conductive through the collector-emitter electrodes thereof to
place the door unlocked signal upon the output circuit of the
bistable multivibrator memory circuit, junction 55, thereof. With
the presence of this door unlocked signal upon junction 55 with
capacitor 99 discharged, the circuitry set forth in FIG. 1 becomes
operative to re-energize operating coil 116 of relay 115 in a
manner previously explained.
Should any of the vehicle doors be opened, movable contact 156 of a
conventional door operated door jamb grounding switch 155 would be
permitted to close to stationary contact 157 to establish an
energizing circuit for dome lamp 158 through leads 34(1) of FIG. 1
and 34(2) of FIG. 2 in a manner well known in the automotive art.
With door operated grounding switch 155 closed while the door is
open, a ground potential appears upon junction 160. Upon the
reclosure of the door, a door opened potential signal appears
across junction 160 and point of reference or ground potential 5 of
a positive polarity upon junction 160 with respect to point of
reference or ground potential 5. This door opened potential signal
is applied across the selected one of the input circuits of the
bistable multivibrator memory circuit, the base-emitter electrodes
of type NPN transistor 50, through resistor 161, differentiating
capacitor 162 and resistor 163. As this door opened potential
signal is of the proper polarity relationship to produce
base-emitter current flow through a type NPN transistor, transistor
50 is triggered conductive through the collector-emitter electrodes
to place the door unlocked signal upon the output circuit of the
bistable multivibrator circuit, junction 55. With the door unlocked
potential signal present upon junction 55, the remainder of the
circuitry of this invention operates to reenergize operating coil
116 of relay 115 in a manner previously explained.
By providing the discharge circuit for capacitor 99 through the
collector-emitter electrodes of transistor 40 previously described,
should any door be unlocked by the operation of either of door lock
switches 15 or 20 to energize the unlock solenoids 10U or 11U or
should any door be opened and reclosed while the vehicle is
operating at or greater than the predetermined speed, the circuitry
of this invention will operate to automatically relock the
doors.
There are certain applications in which the vehicle transmission is
placed in the "Neutral" position and the wheels rotated, such as in
an automatic car wash where the wheels are rotated by rollers while
brushes engage the tire sidewalls. While the vehicle transmission
is in the "Neutral" position, movable contact 32 of transmission
neutral switch 31 is closed to stationary contact 33. To prevent
the operation of the door lock mechanism with the vehicle
transmission in the "Neutral" position and the wheels rotated by an
external force, the emitter electrode 132 and base electrode 131 of
a type PNP transistor 130, FIG. 1, are connected across battery 8
through lead 19, movable contact 26 and stationary contact 27 of
ignition switch 25, lead 165, the emitter-base electrodes of
transistor 130, resistor 171, diode 172, the closed contacts 32 and
33 of transmission neutral switch 31 and cranking motor solenoid 30
to point of reference or ground potential 5. Resistor 173 provides
a base bias for transistor 130. Consequently, emitter-base current
flows through PNP transistor 130 to trigger this device conductive
through the emitter electrode 132 and collector electrode 133. With
transistor 130 conducting through the emitter-collector electrodes,
base drive current is supplied to the base electrode 141 and
emitter electrode 143 of type NPN transistor 140 through current
limiting resistor 139. This base drive current supplied to
transistor 140 produces conduction through the collector electrode
143 and emitter electrode 142 thereof to place junction 95 at
substantially ground potential. Consequently, transistors 70 and
100 will not produce a lock doors signal while transistor 140 is
conducting.
Diodes 175 and 176 of FIG. 2 prevent the junction between capacitor
162 and resistor 163 from going more than one diode drop below
ground and prevent the junction between capacitor 162 and resistor
161 from going more than one diode drop higher than the regulated
potential upon lead 39(2).
While specific transistor types and electrical polarities have been
set forth in this specification, it is to be specifically
understood that alternate transistor types and compatible
electrical polarities may be substituted therefor without departing
from the spirit of the invention.
While a preferred embodiment of the present invention has been
shown and described, it will be obvious to those skilled in the art
that various modifications and substitutions may be made without
departing from the spirit of the invention which is to be limited
only within the scope of the appended claims.
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