Vehicle including an aerodynamic system configured to selectively vary an aerodynamic force acting on the vehicle

• US 9,849,924 B2
• Filed: 12/07/2015
• Issued: 12/26/2017
• Est. Priority Date: 12/07/2015
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Shami, Constandi J.
• Primary Examiner(s): Shaawat, Mussa A
• Assistant Examiner(s): Malhotra, Sanjeev
• Application Number:
  US14/960,612
• Publication Number:
  US 20170158262A1
• Time in Patent Office: 750 Days
• Field of Search: 701 1, 701 38, 701 41, 701 49, 701124, 701 37, 180 15, 180209, 180311, 72483, 244 2, 244 7 B, 2961801, 2961805, 280 87041, 280124103, 280789, 2801241, 702141
• CPC Class Codes: B62D 35/005 Front spoilers B62D35/001 takes precedence
• CPC Class Codes: B62D 35/007 Rear spoilers B62D35/001 takes precedence
• CPC Class Codes: B62D 35/02 Streamlining the undersurfaces B62D35/005, B62D35/007, B62D35/008 take precedence
• CPC Class Codes: B62D 37/02 by aerodynamic means
• CPC Class Codes: G05D 3/00 Control of position or direction G05D1/00 takes precedence; numerical control to execute positioning G05B19/18
• CPC Class Codes: Y02T 10/82 Elements for improving aerodynamics

Abstract

A vehicle includes a body, an aerodynamic element, a movement mechanism, a plurality of sensors, and a controller. The body is located along a longitudinal axis and a lateral axis. The aerodynamic element intersects ambient airflow, which generates an aerodynamic force. The movement mechanism moves the aerodynamic element, relative to the body, along the longitudinal and lateral axes. The sensors collectively generate input signals corresponding to an operating condition of the vehicle. The controller determines a current position of the movement mechanism, corresponding to a current location of the aerodynamic element on the axes and determines a desired position of the movement mechanism, corresponding to a desired location of the aerodynamic element on the axes. The controller transmits a movement signal to the movement mechanism to change position from the current position to the desired position, such that the aerodynamic element moves from the current location to the desired location.

Claims

1. A vehicle having a center of gravity, the vehicle comprising:

a body extending along a longitudinal axis, between a forward end and a rearward end, wherein the forward end is configured to face an oncoming ambient airflow when the vehicle is in motion relative to a road surface;

wherein the body extends along a lateral axis, perpendicular to the longitudinal axis, between a first side and a second side;

an aerodynamic element movably attached to the body and arranged to intersect the ambient airflow such that the ambient airflow circulates about the aerodynamic element and generates an aerodynamic force;

a movement mechanism movably coupling the aerodynamic element and the body, wherein the movement mechanism is configured to selectively move the aerodynamic element, relative to the body, along a longitudinal axis and/or a lateral axis;

a plurality of sensors configured to collectively generate input signals corresponding to an operating condition of the vehicle, as the vehicle is in motion relative to the road surface; and

a controller in operative communication with the movement mechanism and the plurality of sensors, wherein the controller is operable to;

determine a desired location of the aerodynamic element;

determine a desired position of the movement mechanism corresponding to the desired location of the aerodynamic element;

transmit a movement signal to the movement mechanism to change position to the desired position and thereby change location of the aerodynamic element to the desired location;

determine a required location of an aerodynamic center of the vehicle along the longitudinal axis and/or the lateral axis, as a function of at least one of the input signals;

wherein the controller being operable to determine a desired position of the movement mechanism is further defined as the controller being operable to determine a desired position of the movement mechanism corresponding to the required location of the aerodynamic center of the vehicle along the longitudinal axis and/or the lateral axis; and

wherein the controller being operable to transmit a movement signal is further defined as the controller being operable to transmit a movement signal to the movement mechanism to change position to the desired position to thereby change location of the aerodynamic element to the desired location and to thereby change location of the aerodynamic center to the required location.

2. The vehicle, as set forth in claim 1, wherein the controller is further defined as being operable to:

determine a current position of the movement mechanism; and

determine a distance between the current position and the desired position of the movement mechanism;

wherein the controller being operable to transmit a movement signal to the movement mechanism is further defined as the controller being operable to transmit a movement signal to the movement mechanism to change position corresponding to the measured distance between the current position and the desired position of the movement mechanism to change position to the desired position by moving the measured distance.

3. The vehicle, as set forth in claim 2, wherein the controller is further defined as being operable to:

receive and process the input signals;

determine the current aerodynamic center of the vehicle, relative to the center of gravity of the body, as a function of at least one input signal; and

determine the required aerodynamic center of the vehicle, relative to the center of gravity of the body, as a function of at least one input signal.

4. The vehicle, as set forth in claim 1, further comprising a throttle sensor and a steering wheel having a steering angle sensor, wherein the input signals include a throttle request for the throttle sensor and a steering angle for the steering angle sensor.

5. The vehicle, as set forth in claim 1, further comprising a set of accelerometers, wherein the input signals include acceleration signals for each of the accelerometers.

6. The vehicle, as set forth in claim 1, further comprising a plurality of road wheels and at least one wheel speed sensor operatively attached at least one of the road wheels, wherein the input signals include a wheel speed for the wheel speed sensor.

7. An aerodynamic system, for a vehicle including a body having a center of gravity and located along a longitudinal axis and a lateral axis, and including a plurality of sensors configured to collectively generate input signals corresponding to an operating condition of the vehicle, the aerodynamic system comprising:

an aerodynamic element configured to be movably attached to the body and configured to be arranged to intersect the ambient airflow such that the ambient airflow circulates about the aerodynamic element and generates an aerodynamic force on the vehicle;

a movement mechanism configured to movably couple the aerodynamic element and the body, wherein the movement mechanism is configured to selectively move the aerodynamic element, relative to the body, along the longitudinal axis and/or the lateral axis; and

a controller configured to be in operative communication with the movement mechanism and the plurality of sensors, wherein the controller is operable to;

determine a current position of the movement mechanism, corresponding to a current location of the aerodynamic element along the longitudinal axis and/or the lateral axis;

determine a desired position of the movement mechanism, corresponding to a desired location of the aerodynamic element along the longitudinal axis and/or the lateral axis;

transmit a movement signal to the movement mechanism to change position from the current position to the desired position, such that the aerodynamic element moves from the current location to the desired location along the longitudinal axis and/or the lateral axis;

determine a current location of an aerodynamic center of the vehicle along the longitudinal axis and/or the lateral axis, as a function of at least one of the input signals;

determine a required location of the aerodynamic center of the vehicle along the longitudinal axis and/or the lateral axis, as a function of at least one of the input signals; and

wherein the controller being operable to determine a desired position of the movement mechanism is further defined as the controller being operable to determine a desired position of the movement mechanism corresponding to the required location of the aerodynamic center of the vehicle along the longitudinal axis and/or the lateral axis.

8. The aerodynamic system, as set forth in claim 7, wherein the controller is further defined as being operable to measure a distance between the current position and the desired position of the movement mechanism;

and

wherein the controller being operable to transmit a movement signal to the movement mechanism is further defined as the controller being operable to transmit a movement signal to the movement mechanism corresponding to the measured distance between the current position and the desired position of the movement mechanism to move the movement mechanism from the current position to the desired position, such that the aerodynamic element moves from the current location to the desired location along the longitudinal axis and/or the lateral axis.

9. The aerodynamic system, as set forth in claim 8, wherein the controller is further defined as being operable to:

receive and process the input signals;

determine a current location of the aerodynamic center of the vehicle, relative to the center of gravity of the body, as a function of at least one input signal; and

determine a required location of the aerodynamic center of the vehicle, relative to the center of gravity of the body, as a function of at least one input signal.

10. A method of controlling an aerodynamic force acting on a vehicle having a body located along a longitudinal axis and a lateral axis and an aerodynamic element configured to intersect an ambient airflow as the vehicle moves through the ambient airflow, the method comprising:

determining, with a controller, a desired location of the aerodynamic element;

determining, with the controller, a desired position of a movement mechanism corresponding to the desired location of the aerodynamic element, wherein the movement mechanism movably couples the aerodynamic element and the body, and is configured to selectively move the aerodynamic element relative to the body, along a longitudinal axis and/or a lateral axis;

transmitting a movement signal to the movement mechanism to change position to the desired position and thereby change location of the aerodynamic element to the desired location along the longitudinal axis and/or the lateral axis;

determining a required location of an aerodynamic center of the vehicle along the longitudinal axis and/or the lateral axis, as a function of at least one input signal;

wherein determining a desired position of the movement mechanism is further defined as determining a desired position of the movement mechanism corresponding to the required location of the aerodynamic center of the vehicle along the longitudinal axis and/or the lateral axis; and

wherein transmitting a movement signal is further defined as transmitting a movement signal to the movement mechanism to change position to the desired position to thereby change location of the aerodynamic element to the desired location and to thereby change location of the aerodynamic center to the required location.

11. The method, as set forth in claim 10, further comprising detecting a required operating mode of the vehicle;

and

wherein determining, with the controller, a required location of the aerodynamic center of the vehicle is a function of the detected required operating mode of the vehicle.

12. The method, as set forth in claim 11, further comprising:

determining a center of gravity of the vehicle;

determining, with the controller, a current location of the aerodynamic center of the vehicle along the longitudinal axis and/or the lateral axis; and

wherein determining, with the controller, the required location of the aerodynamic center is further defined as determining, with a controller, the required location of the aerodynamic center, relative to the center of gravity of the vehicle and as a function of at least one operating condition of the vehicle.

13. The method, as set forth in claim 11, wherein the at least one operating condition of the vehicle is at least one of a vehicle speed of the vehicle, relative to a ground surface, a steering angle of the vehicle.

14. The method, as set forth in claim 13, wherein the at least one operating condition of the vehicle is at least one of a yaw rate, a longitudinal acceleration, and a lateral acceleration of the vehicle relative to the ground surface.

15. The method, as set forth in claim 13, wherein determining, with the controller, the required location of the aerodynamic center, is further defined as determining, with the controller, the required location of the aerodynamic center to be longitudinally disposed between a forward end of the vehicle and the center of gravity of the vehicle, as a function of the at least one operating condition of the vehicle being a predefined longitudinal acceleration.

16. The method, as set forth in claim 13, wherein determining, with the controller, the required location of the aerodynamic center, is further defined as determining, with the controller, the required location of the aerodynamic center to be laterally disposed inward, relative to the center of gravity of the vehicle, as a function of the at least one operating condition of the vehicle being a predefined yaw rate.

17. The method, as set forth in claim 13, wherein determining, with a controller, the required location of the aerodynamic center, is further defined as determining, with a controller, the required location of the aerodynamic center to be longitudinally disposed between the center of gravity of the vehicle and a rear end of the vehicle, as a function of the at least one operating condition of the vehicle being a predefined longitudinal deceleration.