Aerodynamic system and method for diagnosing the aerodynamic system and verify downforce estimation based on electric motor current

Patent metadata

Field	Value
Publication number	US-9950751-B2
Application number	US-201615229762-A
Country	US
Kind code	B2
Filing date	Aug 5, 2016
Priority date	Sep 25, 2015
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

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.

First claim

The invention claimed is:

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.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Heil Edward T
• Auden Joshua R

Classifications

• B62D35/007

  Rear spoilers (B62D35/001 takes precedence) · CPC title

• B62D35/00 Primary

  Vehicle bodies characterised by streamlining · CPC title

• G01M9/08

  Aerodynamic models · CPC title

• G01M9/06

  Measuring arrangements specially adapted for aerodynamic testing · CPC title

• B62D35/005 Primary

  Front spoilers (B62D35/001 takes precedence) · CPC title