U.S. patent application number 15/685682 was filed with the patent office on 2019-02-28 for active hybrid spoiler for a motor vehicle.
This patent application is currently assigned to GM Global Technology Operations LLC. The applicant listed for this patent is GM Global Technology Operations LLC. Invention is credited to Joshua R. Auden, Timothy D. Demetrio, Jason D. Fahland.
Application Number | 20190061843 15/685682 |
Document ID | / |
Family ID | 65321398 |
Filed Date | 2019-02-28 |
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United States Patent
Application |
20190061843 |
Kind Code |
A1 |
Fahland; Jason D. ; et
al. |
February 28, 2019 |
ACTIVE HYBRID SPOILER FOR A MOTOR VEHICLE
Abstract
A vehicle includes a vehicle body arranged along a longitudinal
body axis in a body plane and having a first vehicle body end
configured to face oncoming ambient airflow when the vehicle is in
motion relative to a road surface. The vehicle also includes an
active hybrid spoiler assembly mounted to the vehicle body and
configured to control a movement of the ambient airflow along the
longitudinal body axis. The spoiler assembly includes at least one
stanchion mounted to the vehicle body, and first and second
wing-shaped side-sections moveably connected to the stanchion(s).
The spoiler assembly further includes a mechanism configured to
selectively and individually shift each of the first wing-shaped
side-section and the second wing-shaped side-section relative to
the at least one stanchion to thereby adjust a magnitude of the
aerodynamic downforce generated by each of the first wing-shaped
side-section and the second wing-shaped side-section on the vehicle
body.
Inventors: |
Fahland; Jason D.; (Fenton,
MI) ; Auden; Joshua R.; (Brighton, MI) ;
Demetrio; Timothy D.; (Highland, MI) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
GM Global Technology Operations LLC |
Detroit |
MI |
US |
|
|
Assignee: |
GM Global Technology Operations
LLC
Detroit
MI
|
Family ID: |
65321398 |
Appl. No.: |
15/685682 |
Filed: |
August 24, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B62D 15/022 20130101;
G01C 1/00 20130101; G01F 1/46 20130101; G05D 3/125 20130101; B62D
35/007 20130101; B62D 37/02 20130101; G01P 3/42 20130101 |
International
Class: |
B62D 37/02 20060101
B62D037/02; B62D 35/00 20060101 B62D035/00; G05D 3/12 20060101
G05D003/12 |
Claims
1. A vehicle comprising: a vehicle body arranged along a
longitudinal body axis in a body plane and having a first vehicle
body end configured to face oncoming ambient airflow when the
vehicle is in motion relative to a road surface; and an active
hybrid spoiler assembly mounted to the vehicle body and configured
to control a movement of the ambient airflow along the longitudinal
body axis, the spoiler assembly having: at least one stanchion
mounted to the vehicle body; a first wing-shaped side-section
moveably connected to the at least one stanchion; a second
wing-shaped side-section moveably connected to the at least one
stanchion; and a mechanism configured to selectively and
individually shift each of the first wing-shaped side-section and
the second wing-shaped side-section relative to the at least one
stanchion to thereby adjust a magnitude of an aerodynamic downforce
generated by each of the first wing-shaped side-section and the
second wing-shaped side-section on the vehicle body.
2. The vehicle according to claim 1, further comprising an
electronic controller configured to regulate the mechanism.
3. The vehicle according to claim 2, further comprising a road
wheel and a first sensor configured to detect a rotating speed of
the road wheel and communicate the detected rotating speed of the
road wheel to the controller.
4. The vehicle according to claim 3, further comprising a second
sensor configured to detect a yaw rate of the vehicle body and
communicate the detected yaw rate to the controller.
5. The vehicle according to claim 4, further comprising a third
sensor configured to detect a velocity of ambient airflow relative
to the vehicle and communicate the detected velocity of the ambient
airflow to the controller.
6. The vehicle according to claim 5, further comprising a steering
wheel and a fourth sensor configured to detect an angle of the
steering wheel.
7. The vehicle according to claim 6, wherein the controller is
configured to selectively shift, via the mechanism, at least one of
the first wing-shaped side-section and the second wing-shaped
side-section relative to the vehicle body during vehicle cornering
in response to the detected yaw rate, the detected angle of the
steering wheel, and at least one of the detected rotating speed of
the road wheel and velocity of the ambient airflow, to thereby vary
the aerodynamic downforce on the vehicle body and control the
detected yaw rate.
8. The vehicle according to claim 1, wherein the mechanism is
configured to selectively and individually rotate each of the first
wing-shaped side-section and the second wing-shaped side-section
about a spoiler axis that is parallel to the body plane, and
selectively and individually pivot the first wing-shaped
side-section to vary a first wing-shaped side-section angle and the
second wing-shaped side-section to vary a second wing-shaped
side-section angle relative to the spoiler axis.
9. The vehicle according to claim 8, wherein: the at least one
stanchion includes a first side stanchion, a second side stanchion,
and a center stanchion arranged between the first stanchion and the
second stanchion; the first wing-shaped side-section is moveably
connected to each of the first side stanchion and the center
stanchion; the second wing-shaped side-section is moveably
connected to each of the second side stanchion and the center
stanchion; and the mechanism is configured to selectively and
individually rotate and pivot the first wing-shaped side-section
relative to the first side stanchion and the center stanchion, and
the second wing-shaped side-section relative to the second side
stanchion and the center stanchion.
10. The vehicle according to claim 1, wherein the vehicle body
includes a second vehicle body end opposite of the first vehicle
body end, and wherein the at least one stanchion connects each of
the first wing-shaped side-section and the second wing-shaped
side-section to the vehicle body at one of the first vehicle body
end and the second vehicle body end.
11. An airflow control system for a motor vehicle having a vehicle
body arranged along a longitudinal body axis in a body plane and
having a first vehicle body end configured to face oncoming ambient
airflow when the vehicle is in motion relative to a road surface,
the airflow control system comprising: an active hybrid spoiler
assembly mounted to the vehicle body and configured to control a
movement of the ambient airflow along the longitudinal body axis,
the spoiler assembly having: at least one stanchion mounted to the
vehicle body; a first wing-shaped side-section moveably connected
to the at least one stanchion; a second wing-shaped side-section
moveably connected to the at least one stanchion; and a mechanism
configured to selectively and individually shift each of the first
wing-shaped side-section and the second wing-shaped side-section
relative to the at least one stanchion to thereby adjust a
magnitude of an aerodynamic downforce generated by each of the
first wing-shaped side-section and the second wing-shaped
side-section on the vehicle body; and an electronic controller
configured to regulate the mechanism.
12. The system according to claim 11, further comprising a road
wheel and a first sensor configured to detect a rotating speed of
the road wheel and communicate the detected rotating speed of the
road wheel to the controller.
13. The system according to claim 12, further comprising a second
sensor configured to detect a yaw rate of the vehicle body and
communicate the detected yaw rate to the controller.
14. The system according to claim 13, further comprising a third
sensor configured to detect a velocity of ambient airflow relative
to the vehicle and communicate the detected velocity of the ambient
airflow to the controller.
15. The system according to claim 14, wherein the vehicle includes
a steering wheel, the spoiler assembly further comprising a fourth
sensor configured to detect an angle of the steering wheel.
16. The system according to claim 15, wherein the controller is
configured to selectively shift, via the mechanism, at least one of
the first wing-shaped side-section and the second wing-shaped
side-section relative to the vehicle body during vehicle cornering
in response to the detected yaw rate, the detected angle of the
steering wheel, and at least one of the detected rotating speed of
the road wheel and velocity of the ambient airflow, to thereby vary
the aerodynamic downforce on the vehicle body and control the
detected yaw rate.
17. The system according to claim 11, wherein the mechanism is
configured to selectively and individually rotate each of the first
wing-shaped side-section and the second wing-shaped side-section
about a spoiler axis that is parallel to the body plane, and
selectively and individually pivot the first wing-shaped
side-section to vary a first wing-shaped side-section angle and the
second wing-shaped side-section to vary a second wing-shaped
side-section angle relative to the spoiler axis.
18. The system according to claim 17, wherein: at least one
stanchion includes a first side stanchion, a second side stanchion,
and a center stanchion arranged between the first side stanchion
and the second side stanchion; the first wing-shaped side-section
is moveably connected to each of the first side stanchion and the
center stanchion; and the second wing-shaped side-section is
moveably connected to each of the second side stanchion and the
center stanchion.
19. The system according to claim 18, wherein the mechanism is
configured to selectively and individually rotate and pivot the
first wing-shaped side-section relative to the first stanchion and
the center stanchion, and the second wing-shaped side-section
relative to the second stanchion and the center stanchion.
20. The system according to claim 11, wherein the vehicle body
includes a second vehicle body end opposite of the first end, and
wherein the at least one stanchion connects each of the first
wing-shaped side-section and the second wing-shaped side-section to
the vehicle body at one of the first vehicle body end and the
second vehicle body end.
Description
[0001] The disclosure relates to an active hybrid spoiler for
enhancement of aerodynamics of a motor vehicle.
[0002] Automotive aerodynamics is the study of aerodynamics of road
vehicles. The main goals of the study are reducing drag and wind
noise, minimizing noise emission, and preventing undesired lift
forces and other causes of aerodynamic instability at high speeds.
Additionally, the study of aerodynamics may also be used to achieve
downforce in high-performance vehicles in order to improve vehicle
traction and cornering abilities. The study is typically used to
shape vehicle bodywork along with employing dedicated aerodynamic
devices for achieving a desired compromise among the above
characteristics for specific vehicle use.
[0003] A spoiler is an automotive aerodynamic device intended to
"spoil" unfavorable air movement across a body of a vehicle in
motion, usually described as turbulence or drag. Spoilers may be
fitted at the front and/or at the rear of the vehicle body.
Spoilers on the front of a vehicle are often called air dams. When
the vehicle is in motion, in addition to directing air flow, such
air dams also reduce the amount of air flowing underneath the
vehicle which generally reduces aerodynamic lift and drag.
[0004] Additionally, when the vehicle is in motion, the flow of air
at the rear of the vehicle becomes turbulent and a low-pressure
zone is created, increasing drag and instability. Adding a spoiler
at the rear of the vehicle body may help to delay flow separation
from the body and a higher pressure zone created in front of the
spoiler may help reduce lift on the vehicle body by creating
downforce. As a result, in certain instances aerodynamic drag may
be reduced and high speed stability will generally be increased due
to the reduced rear lift.
SUMMARY
[0005] A vehicle includes a vehicle body arranged along a
longitudinal body axis in a body plane and having a first vehicle
body end configured to face oncoming ambient airflow when the
vehicle is in motion relative to a road surface. The vehicle also
includes an active hybrid spoiler assembly mounted to the vehicle
body and configured to control a movement of the ambient airflow
along the longitudinal body axis. The spoiler assembly includes at
least one stanchion mounted to the vehicle body. The spoiler
assembly also includes a first wing-shaped side-section moveably
connected to the at least one stanchion. The spoiler assembly
additionally includes a second wing-shaped side-section moveably
connected to the at least one stanchion. The spoiler assembly
further includes a mechanism configured to selectively and
individually shift each of the first wing-shaped side-section and
the second wing-shaped side-section relative to the at least one
stanchion to thereby adjust a magnitude of the aerodynamic
downforce generated by each of the first wing-shaped side-section
and the second wing-shaped side-section on the vehicle body.
[0006] The vehicle may also include an electronic controller
configured to regulate the mechanism.
[0007] The vehicle may additionally include a road wheel and a
first sensor configured to detect a rotating speed of the road
wheel and communicate the detected rotating speed of the road wheel
to the controller.
[0008] The vehicle may also include a second sensor configured to
detect a yaw rate of the vehicle body and communicate the detected
yaw rate to the controller.
[0009] The vehicle may additionally include a third sensor
configured to detect a velocity of ambient airflow relative to the
vehicle and communicate the detected velocity of the ambient
airflow to the controller.
[0010] The vehicle may further include a steering wheel and the
spoiler assembly may additionally include a fourth sensor
configured to detect an angle of the steering wheel.
[0011] The controller may be configured to selectively shift, via
the mechanism, at least one of the first wing-shaped side-section
and the second wing-shaped side-section relative to the vehicle
body during vehicle cornering in response to the detected yaw rate,
the detected angle of the steering wheel, and at least one of the
detected rotating speed of the road wheel and velocity of the
ambient airflow, to thereby vary the aerodynamic downforce on the
vehicle body and control the detected yaw rate.
[0012] The mechanism may be configured to selectively and
individually rotate each of the first wing-shaped side-section and
the second wing-shaped side-section about a spoiler axis that is
parallel to the body plane, and selectively and individually pivot
the first wing-shaped side-section to vary a first wing-shaped
side-section angle and the second wing-shaped side-section to vary
a second wing-shaped side-section angle relative to the spoiler
axis.
[0013] The at least one stanchion may include a first side
stanchion, a second side stanchion, and a center stanchion arranged
between the first side stanchion and the second side stanchion. In
such an embodiment, the first wing-shaped side-section may be
moveably connected to each of the first side stanchion and the
center stanchion, and the second wing-shaped side-section may be
moveably connected to each of the second side stanchion and the
center stanchion.
[0014] The mechanism may be configured to selectively and
individually rotate and pivot the first wing-shaped side-section
relative to the first side stanchion and the center stanchion, and
the second wing-shaped side-section relative to the second side
stanchion and the center stanchion.
[0015] The mechanism may include at least one of a linear actuator,
a rotary actuator, an electric motor, and operative connections or
joints configured to facilitate simultaneous pivoting and rotation
of the first wing-shaped side-section and the second wing-shaped
side-section relative to the vehicle body and the respective
stanchions.
[0016] The vehicle body may include a second vehicle body end
opposite of the first end. In such an embodiment, the stanchion(s)
connect each of the first wing-shaped side-section and the second
wing-shaped side-section to the vehicle body either at the first
vehicle body end or at the second vehicle body end.
[0017] The above features and advantages, and other features and
advantages of the present disclosure, will be readily apparent from
the following detailed description of the embodiment(s) and best
mode(s) for carrying out the described disclosure when taken in
connection with the accompanying drawings and appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018] FIG. 1 is a schematic top view of a vehicle having a vehicle
body arranged in a body plane along a longitudinal axis, and having
a spoiler assembly according to an embodiment the disclosure.
[0019] FIG. 2 is a schematic bottom view of the vehicle shown in
FIG. 1 and having a spoiler assembly according to another
embodiment the disclosure.
[0020] FIG. 3 is a schematic perspective view of a representative
spoiler assembly for each of the embodiments shown in FIGS. 1 and
2.
DETAILED DESCRIPTION
[0021] Referring to the drawings, wherein like reference numbers
refer to like components, FIG. 1 shows a schematic view of a motor
vehicle 10 positioned relative to a road surface 12. The vehicle 10
includes a vehicle body 14 arranged along a longitudinal body axis
X in a body plane P that is substantially parallel to the road
surface 12. The vehicle body 14 defines six body sides. The six
body sides include a first body end or front end 16, an opposing
second body end or rear end 18, a first lateral body side or left
side 20, and a second lateral body side or right side 22, a top
body portion 24, which may include a vehicle roof, and an underbody
portion 26.
[0022] The left side 20 and right side 22 are disposed generally
parallel to each other and with respect to the virtual longitudinal
axis X of the vehicle 10, and span the distance between the front
end 16 and the rear end 18. The body plane P is defined to include
the longitudinal axis X. A passenger compartment (not shown) of the
vehicle 10 is generally bounded by the front and rear ends 16, 18
and the left and right sides of the body 14. As seen in FIG. 1, the
front end 16 is configured to face an oncoming ambient airflow 27
when the vehicle 10 is in motion relative to the road surface 12.
When the vehicle 10 is in motion, the oncoming ambient airflow 27
moves substantially parallel to the body plane P and along the
longitudinal axis X.
[0023] As the vehicle 10 moves relative to the road surface 12, the
ambient airflow 27 passes around the vehicle body 14 and splits
into respective first airflow portion 27-1, second airflow portion
27-2, third airflow portion 27-3, and fourth airflow portion 27-4,
that eventually rejoin in a wake area or recirculating airflow
region 27-6 immediately behind the rear end 18. Specifically, as
shown in FIG. 1, the first airflow portion 27-1 passes over the top
body portion 24, second airflow portion 27-2 passes over the left
side 20, third airflow portion 27-3 passes over the right side 22,
and fourth airflow portion 27-4 (shown in FIG. 2) passes under the
vehicle body 14, between the underbody portion 26 and the road
surface 12. The recirculating airflow region 27-6 is generally
caused at elevated vehicle speeds by the flow of surrounding air
around the six body sides of the vehicle body 14.
[0024] As shown in FIGS. 1-3, the vehicle 10 also includes an
airflow control system 28. The airflow control system 28 includes
an active hybrid spoiler assembly 30 mounted to the vehicle body 14
and configured to control a movement of the ambient airflow 27
along the longitudinal body axis X. The spoiler assembly 30
includes at least one stanchion, generally indicated via numeral
32, mounted to the vehicle body 14. The spoiler assembly 30 also
includes an articulating first wing-shaped side-section 34-1
arranged proximate the left side 20 and an articulating second
wing-shaped side-section 34-2 arranged proximate the right side 22
of the vehicle body 14. "Wing-shaped" is herein defined as a fin
having an airfoil shape, or a streamlined cross-sectional shape
producing lift for flight or propulsion through a fluid. The
spoiler assembly 30 is identified as an "active hybrid" assembly
due to the multiple degrees of articulation available for the first
and second wing-shaped side-section 34-1, 34-2. As may be seen in
FIG. 3, the spoiler axis Y may be positioned initially and as a
default axis, transversely to the longitudinal body axis X and
parallel to the body plane P. Each of the first and second
wing-shaped side-section 34-1, 34-2 may be formed from a suitably
rigid but low mass material for structural stability, such as an
engineered plastic, carbon fiber, or aluminum.
[0025] Each of the first wing-shaped side-section 34-1 and the
second wing-shaped side-section 34-2 is moveably connected to the
at least one stanchion 32. The stanchion(s) 32 may connect the
first and second wing-shaped side-section 34-1, 34-2 to the vehicle
body 14 at the front end 16. Similarly, the stanchion(s) 32 may
connect the first and second wing-shaped side-section 34-1, 34-2 to
the vehicle body 14 at the rear end 18. When mounted on the front
end 16 (as shown in FIG. 2), the spoiler assembly 30 functions as
an air dam that varies a downforce exerted by the ambient airflow
27 at the front of the vehicle 10. On the other hand, when the
spoiler assembly 30 is mounted on the rear end 18 of the vehicle
body 14 (as shown in FIG. 1), the spoiler assembly varies a
downforce exerted by the ambient airflow 27 at the rear of the
vehicle 10. Accordingly, to increase vehicle traction, the spoiler
assembly 30 mounted on the front end 16 may be employed to increase
the downforce at the front of the vehicle, while the spoiler
assembly mounted on the rear end 18 may be employed to increase the
downforce at the rear of the vehicle. The stanchion(s) 32 are
configured to support the first and second wing-shaped side-section
34-1, 34-2 relative to the vehicle body 14 in order to apply the
respective front or rear downforce to the vehicle body when the
vehicle 10 is in motion.
[0026] The spoiler assembly 30 includes a virtual spoiler axis Y
that is parallel to the body plane P and is perpendicular to the
longitudinal body axis X. The spoiler assembly 30 further includes
a mechanism 36 configured to selectively and individually shift
each of the first wing-shaped side-section 34-1 and the second
wing-shaped side-section 34-2 relative to stanchion(s) 32. The
shifting of the first and second wing-shaped side-sections 34-1,
34-2 via the mechanism 36 is configured to adjust a magnitude of
the aerodynamic downforce generated by each of the first and second
wing-shaped side-sections on the vehicle body 14, specifically a
downforce F.sub.d1 on the left side 20 and a downforce F.sub.d2 on
the right side 22 of the vehicle body 14, when the vehicle 10 is in
motion. The mechanism 36 may include suitable components for
generating individual movement of the first wing-shaped
side-section 34-1 and the second wing-shaped side-section 34-2,
such as linear actuator(s) 36-1 and/or an electric motor(s) 36-2.
The mechanism 36 may also include a gear drive 36-3, such as
reduction gear-set(s), for coupling the linear actuator(s) or
electric motor(s) to the respective first and second wing-shaped
side-sections 34-1, 34-2, and configured to affect the desired
movement of the subject side-sections relative to the vehicle body
14.
[0027] As also shown in FIGS. 1-3, the airflow control system 28
additionally includes an electronic controller 38 configured, i.e.,
constructed and programmed, to regulate the mechanism 36. The
controller 38 may be configured as a central processing unit (CPU)
configured to regulate operation of an internal combustion engine
40 (shown in FIG. 1), a hybrid-electric powertrain (not shown), or
other alternative types of powerplants, as well as other vehicle
systems, or a dedicated controller. In order to appropriately
control operation of the mechanism 36, the controller 38 includes a
memory, at least some of which is tangible and non-transitory. The
memory may be a recordable medium that participates in providing
computer-readable data or process instructions. Such a medium may
take many forms, including but not limited to non-volatile media
and volatile media.
[0028] Non-volatile media for the controller 38 may include, for
example, optical or magnetic disks and other persistent memory.
Volatile media may include, for example, dynamic random access
memory (DRAM), which may constitute a main memory. Such
instructions may be transmitted by one or more transmission medium,
including coaxial cables, copper wire and fiber optics, including
the wires that comprise a system bus coupled to a processor of a
computer. Memory of the controller 38 may also include a flexible
disk, hard disk, magnetic tape, magnetic medium, a CD-ROM, DVD, an
optical medium, etc. The controller 38 may be configured or
equipped with other required computer hardware, such as a
high-speed clock, requisite Analog-to-Digital (A/D) and/or
Digital-to-Analog (D/A) circuitry, input/output circuitry and
devices (I/O), as well as appropriate signal conditioning and/or
buffer circuitry. Algorithms required by the controller 38 or
accessible thereby may be stored in the memory and automatically
executed to provide the required functionality.
[0029] As shown in FIGS. 1-3, the vehicle 10 also includes road
wheels 42. A plurality of first sensors 44 may be arranged on the
vehicle body 14 for detecting rotating speeds of each road wheel 42
(shown in FIG. 2). Each first sensor 44 may also be configured to
communicate the detected rotating speed of the respective road
wheel 42 to the controller 38, while the controller may be
configured to correlate the data received from the respective first
sensors to road speed of the vehicle 10. The vehicle 10 may also
include a second sensor 46 (shown in FIG. 2) configured to detect a
yaw moment or rate on the vehicle body 14 relative to the road
surface 12 and communicate the detected yaw rate to the controller
38. The vehicle may additionally include a third sensor 48 (shown
in FIG. 1) configured to detect a velocity of ambient airflow 27
relative to the vehicle 10 and communicate the detected velocity of
the ambient airflow to the controller 38. The third sensor 48 may
be a pitot tube configured to detect a pressure of the ambient
airflow 27 at a specific location relative to the vehicle body 14,
and the controller 38 may correlate the measured pressure to
airflow velocity.
[0030] The mechanism 36 may be configured to selectively and
individually rotate each of the first wing-shaped side-section 34-1
and the second wing-shaped side-section 34-2 about the spoiler axis
Y. As shown in FIG. 3, the mechanism 36 may be configured to apply
a torque T1 to rotate the first or second wing-shaped side-section
34-1, 34-2 in one direction and an opposite torque T2 to rotate the
subject wing-shaped side-section in the opposite direction. Such
rotation of the first wing-shaped side-section 34-1 about the
spoiler axis X varies a first rotation angle .theta..sub.R1
defining an incidence of attack of the first wing-shaped
side-section relative to the oncoming ambient airflow 27.
Analogously, the rotation of the second wing-shaped side-section
34-2 about the spoiler axis Y varies a second rotation angle
.theta..sub.R2 defining an incidence of attack of the second
wing-shaped side-section relative to the oncoming ambient airflow
27. As shown in FIGS. 1 and 3, the at least one stanchion 32 may
include a first or left side stanchion 32-1, a second or right side
stanchion 32-2, as well as a center stanchion 32-3 arranged between
the first side stanchion and the second side stanchion.
[0031] As specifically shown in FIG. 3, each of the first
wing-shaped side-section 34-1 and the second wing-shaped
side-section 34-2 is defined by respective first ends 34-1A, 34-2A,
and respective second ends 34-1B, 34-2B. As also shown in FIG. 3,
the first wing-shaped side-section 34-1 is moveably connected to
the first side stanchion 32-1 at the first end 34-1A and to the
center stanchion 32-3 at the second end 34-1B. Similarly, the
second wing-shaped side-section 34-2 is moveably connected to the
second side stanchion 32-2 at the first end 34-2A and to the center
stanchion 32-3 at the second end 34-2B. As shown, the mechanism 36
may be configured to selectively and individually pivot the first
wing-shaped side-section 34-1 and the second wing-shaped
side-section 34-2 relative to the body plane P. Such pivoting
action of the first wing-shaped side-section 34-1 varies a first
pivot angle .theta..sub.P1 relative to the center stanchion 32-3
and to the spoiler axis Y. Similarly, the pivoting action of the
second wing-shaped side-section 34-2 a second pivot angle
.theta..sub.P2 relative to the center stanchion 32-3 and to the
spoiler axis Y.
[0032] To facilitate both of the above-described rotation and
pivoting of the first wing-shaped side-section 34-1 and the second
wing-shaped side-section 34-2, the mechanism 36 may additionally
include individual operative connections 36-4 between the subject
side sections and the stanchion(s) 32, e.g., the first side, second
side, and center stanchions 32-1, 32-2, 32-3. Such operative
connections 36-4 may, for example, include a universal joint (shown
in FIG. 3) or a constant velocity joint (not shown) for each
articulating interface between the first and second wing-shaped
side-section 34-1, 34-2 and the respective stanchions 32-1, 32-2,
32-3, configured to enable simultaneous rotation and pivoting of
the subject side-sections.
[0033] The controller 38 may be configured to vary specific angles
.theta..sub.R1, .theta..sub.R2, .theta..sub.P2, .theta..sub.P2 of
the at least one of the respective first wing-shaped side-section
34-1 and the second wing-shaped side-section 34-2 during cornering
of the vehicle 10 in response to the yaw rate detected by the
second sensor 46. Furthermore, the controller 38 may be configured
to vary the angles .theta..sub.R1, .theta..sub.R2, .theta..sub.P2,
.theta..sub.P2 in response to the rotating speeds of the road
wheels 42 detected via the first sensor 44 and/or the velocity of
the ambient airflow 27 detected via the third sensor 48.
Accordingly, one or more of the angles .theta..sub.R1,
.theta..sub.R2, .theta..sub.P2, .theta..sub.P2 of the respective
first wing-shaped side-section 34-1 and the second wing-shaped
side-section 34-2 may be controlled relative to the longitudinal
body axis X, the body plane P, and to the spoiler axis Y
proportionately to the yaw rate generated during cornering of the
vehicle 10 by turning the subject wing-shaped side-section. The
controller 38 may be programmed with a look-up table 39
establishing correspondence between the vehicle yaw rate, vehicle
road speed, and/or velocity of the airflow and appropriate angles
.theta..sub.R1, .theta..sub.R2, .theta..sub.P2, .theta..sub.P2 of
the respective first wing-shaped side-section 34-1 and the second
wing-shaped side-section 34-2 for affecting appropriate regulation
of the mechanism 36. The look-up table 39 may be developed
empirically during validation and testing of the vehicle 10.
[0034] As specific angles .theta..sub.R1, .theta..sub.R2,
.theta..sub.P2, .theta..sub.P2 of the first wing-shaped
side-section 34-1 and the second wing-shaped side-section 34-2 are
varied during the cornering event, the spoiler assembly 30
positioned at the front end 16 is able to use the ambient airflow
27 more effectively in order to individually maximize the downforce
F.sub.D1 on the left side 20 and the downforce F.sub.d2 on the
right side 22 at the front end of the vehicle body 14. Similarly,
the spoiler assembly 30 positioned at the rear end 18 is able to
use the ambient airflow 27 more effectively during the cornering
event in order to maximize the downforce F.sub.D1 on the left side
20 and the downforce F.sub.D2 on the right side 22 at the rear end
of the vehicle body 14. Accordingly, the spoiler assembly 30 may be
employed as a rudder or tiller at the front end 16 to counteract
understeer, i.e., when, during cornering, the wheels 42 at the
front end 16 of the vehicle 10 follow a wider path relative to an
apex of the corner than the wheels 42 at the rear end 18.
Similarly, the spoiler assembly 30 may be employed as a rudder at
the rear end 18 to counteract oversteer, i.e., when, during
cornering, the wheels 42 at the rear end 18 of the vehicle 10
follow a wider path relative to an apex of the corner than the
wheels 42 at the front end 16.
[0035] To appropriately control the spoiler assembly 30 during
cornering, the controller 38 may be additionally programmed to
determine a slip of the vehicle 10 relative to the road surface 12.
The slip of the vehicle 10 may include a measure of how much each
of the road wheels 42 has slipped in a direction that is generally
perpendicular to the longitudinal vehicle axis X, which identifies
that the vehicle has deviated from an intended direction or path
along the road surface 12. The intended direction of the vehicle 10
may be identified by the steering wheel angle, which may be
detected by a fourth sensor 50 operatively connected to a steering
wheel 52 (shown in FIG. 1) and communicated to the controller 38.
Furthermore, the controller 38 may be programmed to compare the
determined steering wheel angle and yaw rate to determine how much
the vehicle has deviated from its intended direction or path.
[0036] The controller 38 may also be programmed to control the slip
of the vehicle 10 relative to the road surface 12 by affecting
rotation and pivoting, as needed, to control specific angles
.theta..sub.R1, .theta..sub.R2, .theta..sub.P2, .theta..sub.P2 of
the respective first wing-shaped side-section 34-1 and/or the
second wing-shaped side-section 34-2 via the mechanism 36 in
response to how much the vehicle has deviated from its intended
path. The employed rotation and or pivoting of the respective first
wing-shaped side-section 34-1 and/or the second wing-shaped
side-section 34-2 then urges the vehicle 10 to return to the actual
vehicle heading to the desired heading being commanded by an
operator of the vehicle at the steering wheel 52. Additionally, two
third sensors 48 may be arranged on the spoiler assembly 30, one on
the first wing-shaped side-section 34-1 and the second wing-shaped
side-section 34-2 (not shown). The controller 38 may then be
configured to vary specific angles .theta..sub.R1, .theta..sub.R2,
.theta..sub.P2, .theta..sub.P2 relative to the longitudinal body
axis X, the body plane P, and to the spoiler axis Y in response to
a determined differential between air velocity measurements at each
third sensor 48 as the vehicle 10 enters and negotiates a turn to
vary the downforce F.sub.D1 on the left side 20 and the downforce
F.sub.d2 on the right side 22 of the vehicle body 14.
[0037] Accordingly, control of the active hybrid spoiler assembly
30 via individual rotation of the first and/or second wing-shaped
side-section 34-1, 34-2 may be employed to maintain contact of the
vehicle 10 with the road surface 12 at elevated speeds by
countering aerodynamic lift of the vehicle body 14 in response to
the velocity of ambient airflow 27 detected by the third sensor 48.
Additionally, individual control of the rotation and/or pivoting of
the first and/or second wing-shaped side-section 34-1, 34-2 may be
employed to aid handling of the vehicle 10 in order to maintain the
vehicle on its intended path by countering the yaw moment acting on
the vehicle body 14 as detected by the second sensor 46. As a
result, the airflow control system 28 employing the spoiler
assembly 30 may operate as an airflow-based stability control
system for the vehicle 10.
[0038] The detailed description and the drawings or figures are
supportive and descriptive of the disclosure, but the scope of the
disclosure is defined solely by the claims. While some of the best
modes and other embodiments for carrying out the claimed disclosure
have been described in detail, various alternative designs and
embodiments exist for practicing the disclosure defined in the
appended claims. Furthermore, the embodiments shown in the drawings
or the characteristics of various embodiments mentioned in the
present description are not necessarily to be understood as
embodiments independent of each other. Rather, it is possible that
each of the characteristics described in one of the examples of an
embodiment may be combined with one or a plurality of other desired
characteristics from other embodiments, resulting in other
embodiments not described in words or by reference to the drawings.
Accordingly, such other embodiments fall within the framework of
the scope of the appended claims.
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