AERODYNAMIC SYSTEM AND METHOD FOR DIAGNOSING THE AERODYNAMIC SYSTEM AND VERIFY DOWNFORCE ESTIMATION BASED ON ELECTRIC MOTOR CURRENT

• US 20170088193A1
• Filed: 08/05/2016
• Published: 03/30/2017
• Est. Priority Date: 09/25/2015
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Heil, Edward T., Auden, Joshua R.
• Granted Patent: US 9,950,751 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B62D 35/00 Vehicle bodies characterised by streamlining
• 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 37/02 by aerodynamic means
• CPC Class Codes: G01M 9/06 Measuring arrangements specially adapted for aerodynamic testing
• CPC Class Codes: G01M 9/08 Aerodynamic models
• CPC Class Codes: Y02T 10/82 Elements for improving aerodynamics

Abstract

A method can be executed to diagnose an aerodynamic system and includes the following steps: (a) determining, via a controller, a first expected downforce acting on an aerodynamic element of a vehicle based, at least in part, on a current position of the aerodynamic element relative to a vehicle body of the vehicle, wherein an electric motor is operatively coupled to the aerodynamic element; (b) determining, via the controller, a second expected downforce acting on the aerodynamic element of the vehicle based, at least in part, on an electrical current used to move the electric motor in order to move the aerodynamic element from the current position to another position; (c) determining a deviation, via the controller, based on the first expected downforce and the second expected downforce; and (d) controlling, via the controller, the aerodynamic element based, at least in part, on the deviation.

Claims

1. A method, comprising:

determining, via a controller, a first expected downforce acting on an aerodynamic element of a vehicle based, at least in part, on a current position of the aerodynamic element relative to a vehicle body of a vehicle, wherein an actuation mechanism comprising an electric motor is operatively coupled to the aerodynamic element;

determining, via the controller, a second expected downforce acting on the aerodynamic element of the vehicle based, at least in part, on an electrical current used to move the electric motor in order to move the aerodynamic element from the current position to another position;

determining a deviation, via the controller, based, at least in part, on the first expected downforce and the second expected downforce; and

controlling, via the controller, the aerodynamic element based, at least in part, on the deviation.

2. The method of claim 1, further comprising determining a motor force used to move the electric motor based on the electrical current used to move the electric motor in order to move the aerodynamic element from the current position to another position.

3. The method of claim 2, wherein the second expected downforce is based, at least in part, on the motor force.

4. The method of claim 3, further comprising determining an actuation force of the electric motor to move the aerodynamic element from the current position.

5. The method of claim 4, wherein the second expected downforce is based, at least in part, on the motor force and the actuation force.

6. The method of claim 5, wherein determining the second expected downforce includes subtracting the actuation force from the motor force.

7. The method of claim 1, wherein determining the deviation includes subtracting the second expected downforce from the first expected downforce.

8. The method of claim 1, further comprising commanding the actuation mechanism to move the aerodynamic element relative to the vehicle body.

9. The method of claim 8, further comprising commanding the actuation mechanism to move the aerodynamic element relative to the vehicle body when the deviation is less than a first predetermined threshold.

10. The method of claim 9, further comprising commanding the actuation mechanism to move the aerodynamic element relative to the vehicle body when the deviation is greater than a second predetermined threshold, wherein the second predetermined threshold is greater than the first predetermined threshold.

11. The method of claim 1, further comprising communicating the deviation to other controllers.

12. The method of claim 1, further comprising providing a diagnosis status to other controllers based on the deviation.

13. A vehicle, comprising:

a vehicle body;

an aerodynamic element movably coupled to the vehicle body;

an actuation mechanism comprising an electric motor coupled to the aerodynamic element;

a controller in communication with the electric motor, wherein the controller is programmed to;

determine a first expected downforce acting on the aerodynamic element of the vehicle based, at least in part, on a current position of the aerodynamic element relative to the vehicle body;

determine a second expected downforce acting on the aerodynamic element of the vehicle based, at least in part, on an electrical current used to actuate the electric motor in order to move the aerodynamic element from the current position to another position;

determine a deviation based, at least in part, on the first expected downforce and the second expected downforce; and

control the aerodynamic element based, at least in part, on the deviation.

14. The vehicle of claim 13, wherein the controller is programmed to determine a motor force used to move the electric motor based on the electrical current used to move the electric motor in order to move the aerodynamic element from the current position to another position.

15. The vehicle of claim 14, wherein the second expected downforce is based, at least in part, on the motor force.

16. The vehicle of claim 15, wherein the controller is programmed to determine an actuation force that the electric motor needs to generate in order to move the aerodynamic element from the current position.

17. The vehicle of claim 16, wherein the second expected downforce is based, at least in part, on the motor force and the actuation force.

18. The vehicle of claim 17, wherein the controller is programmed to determine the second expected downforce by subtracting the actuation force from the motor force.

19. The vehicle of claim 13, wherein the controller is programmed to determine the deviation by subtracting the second expected downforce from the first expected downforce.

20. The vehicle of claim 13, wherein the controller is programmed to command the actuation mechanism to move the aerodynamic element relative to the vehicle body.