Methods and systems for controlling steering in a vehicle using a primary active steering functionality and a supplemental active steering functionality

• US 8,060,278 B2
• Filed: 10/15/2007
• Issued: 11/15/2011
• Est. Priority Date: 10/15/2007
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Feller, Ross, Bolio, Robert R., Katrak, Kerfegar K.
• Primary Examiner(s): To; Tuan C.
• Application Number:
  US11/872,185
• Publication Number:
  US 20090099729A1
• Time in Patent Office: 1,492 Days
• Field of Search: 701/41, 180/401, 180/446, 180/422, 180/421, 180/443, 180/444, 318/432
• US Class Current: 701/41
• CPC Class Codes: B62D 5/008 Changing the transfer ratio between the steering wheel and the steering gear by variable supply of energy, e.g. by using a superposition gear
• CPC Class Codes: B62D 5/0481 monitoring the steering system, e.g. failures
• CPC Class Codes: B62D 5/0484 for reaction to failures, e.g. limp home
• CPC Class Codes: B62D 6/002 computing target steering angles for front or rear wheels B62D7/159 takes precedence

Abstract

A method for controlling steering in a vehicle includes the steps of obtaining a vehicle steering communication, controlling an actuator coupled to a hand wheel, a road wheel, or both using a primary active steering functionality, if the vehicle steering communication reflects one or more of a plurality of types of specified errors, and controlling the actuator using the primary active steering functionality and a supplemental active steering functionality, if the vehicle steering communication does not reflect one or more of the plurality of types of specified errors.

Claims

1. A method for controlling steering in a vehicle, the method comprising the steps of:

obtaining a vehicle steering communication;

controlling an actuator coupled to a hand wheel, a road wheel, or both, using a primary active steering functionality that controls steering based on a driver'"'"'s intended steering angle, if the vehicle steering communication reflects one or more of a plurality of types of specified errors; and

controlling the actuator at least in part using the primary active steering functionality and a supplemental active steering functionality that controls steering based on a calculated adjustment to the driver'"'"'s intended steering angle, to thereby control steering different from the driver'"'"'s intended steering angle, if the vehicle steering communication does not reflect one or more of the plurality of types of specified errors.

2. The method of claim 1, wherein the primary active steering functionality is operated in:

a first mode, if the vehicle steering communication does not reflect one or more of the plurality of types of specified errors; and

a second mode, if the vehicle steering communication reflects one or more of the plurality of types of specified errors, wherein the second mode comprises a secure mode with less sensitive steering than the first mode.

3. The method of claim 1, wherein:

the primary active steering functionality determines the driver'"'"'s intended steering angle; and

the supplemental active steering functionality calculates the adjustment to the driver'"'"'s intended steering angle.

4. The method of claim 1, wherein the driver'"'"'s intended steering angle is determined at least in part as a function of the following variables:

a steering wheel angle, a steering wheel angle rate, a speed of the vehicle, or any combination thereof.

5. The method of claim 3, wherein the supplemental active steering functionality comprises an electronic stability control functionality, and the method further comprises the step of:

adjusting the driver'"'"'s intended steering angle by the adjustment, if both of the following conditions are satisfied;

the vehicle steering communication indicates that stability control is needed; and

the vehicle steering communication does not reflect one or more of the plurality of types of specified errors.

6. The method of claim 2, further comprising the step of:

providing a visual alert, an audio alert, or both when the primary active steering functionality is operated in the secure mode.

7. The method of claim 5, further comprising the steps of:

obtaining an additional vehicle steering communication; and

resetting the driver'"'"'s intended steering angle to offset the adjustment, if the following condition is satisfied;

after the driver'"'"'s intended steering angle is adjusted, the additional vehicle steering communication reflects one or more of the plurality of types of specified errors.

8. A program product for controlling steering in a vehicle, comprising:

a program configured to at least facilitate;

obtaining a vehicle steering communication;

controlling an actuator coupled to a hand wheel, a road wheel, or both, using a primary active steering functionality that controls steering based on a driver'"'"'s intended steering angle, if the vehicle steering communication reflects one or more of a plurality of types of specified errors; and

controlling the actuator using the primary active steering functionality and a supplemental active steering functionality that controls steering based on a calculated adjustment to the driver'"'"'s intended steering angle, to thereby control steering different from the driver'"'"'s intended steering angle, if the vehicle steering communication does not reflect one or more of the plurality of types of specified errors; and

a computer-readable signal bearing media bearing the program.

9. The program product of claim 8, wherein the program is configured to operate the primary active steering functionality in:

a first mode, if the vehicle steering communication does not reflect one or more of the plurality of types of specified errors; and

a second mode, if the vehicle steering communication reflects one or more of the plurality of types of specified errors, wherein the second mode comprises a secure mode with less sensitive steering than the first mode.

10. The program product of claim 8, wherein:

the primary active steering functionality determines the driver'"'"'s intended steering angle; and

the supplemental active steering functionality calculates the adjustment to the driver'"'"'s intended steering angle.

11. The program product of claim 10, wherein the supplemental active steering functionality comprises an electronic stability control functionality, and the program is further configured to at least facilitate:

adjusting the driver'"'"'s intended steering angle by the adjustment, if both of the following conditions are satisfied;

the vehicle steering communication indicates that stability control is needed; and

the vehicle steering communication does not reflect one or more of the plurality of types of specified errors.

12. The program product of claim 11, wherein the program is further configured to at least facilitate:

obtaining an additional vehicle steering communication; and

resetting the driver'"'"'s intended steering angle to offset the adjustment, if the following condition is satisfied;

after the driver'"'"'s intended steering angle is adjusted, the additional vehicle steering communication reflects one or more of the plurality of types of specified errors.

13. An active steering system for a vehicle, the active steering system comprising:

a supervisory control module; and

an active steering control module coupled to the supervisory control module and configured to receive a vehicle steering communication therefrom, the active steering control module further configured to at least facilitate;

controlling a hand wheel, a road wheel, or both, using a primary active steering functionality that controls steering based on a driver'"'"'s intended steering angle, if the vehicle steering communication reflects one or more of a plurality of types of specified errors; and

controlling the hand wheel, the road wheel, or both, using the primary active steering functionality and a supplemental active steering functionality that controls steering based on a calculated adjustment to the driver'"'"'s intended steering angle, to thereby control steering different from the driver'"'"'s intended steering angle, if the vehicle steering communication does not reflect one or more of the plurality of types of specified errors.

14. The active steering system of claim 13, wherein the active steering control module is configured to operate the primary active steering functionality in:

a first mode, if the vehicle steering communication does not reflect one or more of the plurality of types of specified errors; and

a second mode, if the vehicle steering communication reflects one or more of the plurality of types of specified error, wherein the second mode comprises a secure mode with less sensitive steering than the first mode.

15. The active steering system of claim 13, wherein:

the primary active steering functionality determines the driver'"'"'s intended steering angle; and

the supplemental active steering functionality calculates the adjustment to the driver'"'"'s intended steering angle.

16. The active steering system of claim 15, wherein the supplemental active steering functionality comprises an electronic stability control functionality, and the active steering control module is further configured to at least facilitate:

adjusting the driver'"'"'s intended steering angle by the adjustment, if both of the following conditions are satisfied;

the vehicle steering communication indicates that stability control is needed; and

the vehicle steering communication does not reflect one or more of the plurality of types of specified errors.

17. The active steering system of claim 13, further comprising:

a sensor coupled to the supervisory control module and configured to supply information thereto for use in the vehicle steering communication.

18. The active steering system of claim 13, wherein the active steering system further comprises:

an actuator unit coupled to the active steering control module;

wherein the supervisory control module is configured to control the hand wheel, the road wheel, or both at least in part via movement of the actuator unit.

19. The active steering system of claim 14, further comprising:

an alert module coupled to the active steering control module and configured to provide a visual alert, an audio alert, or both based on an instruction from the active steering control module when the primary active steering functionality is used in connection with the secure mode.

20. The active steering system of claim 16, wherein the active steering control module is further configured to at least facilitate:

obtaining an additional vehicle steering communication; and

resetting the driver'"'"'s intended steering angle to offset the adjustment, if the following condition is satisfied;

after the driver'"'"'s intended steering angle is adjusted, the additional vehicle steering communication reflects one or more of the plurality of types of specified errors.