Method for implementing vehicle stability enhancement reference models for active steer systems

• US 7,083,025 B2
• Filed: 04/30/2003
• Issued: 08/01/2006
• Est. Priority Date: 06/03/2002
• Status: Expired due to Fees

• Current Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust), Steering Solutions IP Holding Corporation (Nexteer Automotive Group Ltd.)
• Original Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Inventors: Boswell, Karen A., Bedner, Edward J., Martens, John D.
• Primary Examiner(s): Hurley, Kevin
• Application Number:
  US10/426,302
• Publication Number:
  US 20030221899A1
• Time in Patent Office: 1,189 Days
• Field of Search: 180/402, 180/446, 701/41, 701/42, 701/43, 701/44
• US Class Current: 180/402
• 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 6/003 in order to control vehicle yaw movement, i.e. around a vertical axis B62D6/007 takes precedence

Abstract

A method for implementing a vehicle stability enhancement (VSE) system for a vehicle is disclosed. In an exemplary embodiment, the method includes receiving a handwheel angle input and adjusting the handwheel angle input in response to a variable steering ratio generated in the vehicle. The adjusted handwheel angle input is inputted into a reference model, the reference model thereby outputting one or more desired vehicle handling aspects.

Claims

1. A computer implemented method for implementing a vehicle stability enhancement (VSE) system for a vehicle, the method comprising:

receiving a handwheel angle value utilizing a computer;

adjusting said handwheel angle value in response to a variable steering ratio generated in the vehicle, utilizing said computer; and

inputting said adjusted handwheel angle value into a reference model algorithm utilized in said computer, said reference model algorithm outputting at least one of a desired yaw rate value and a desired side slip value associated with said vehicle, based on said adjusted handwheel value.

2. The method of claim 1, wherein said variable steering ratio is generated by an active front steering system.

3. The method of claim 1, wherein said adjusting said handwheel angle value comprises summing an offset angle value with said handwheel angle value to produce an effective handwheel angle value, said offset angle value being a function of said variable steering ratio.

4. The method of claim 1, further comprising inputting a vehicle speed value into said reference model algorithm.

5. The method of claim 4, wherein the reference model algorithm utilizes first and second lookup tables and a filter, the method further comprising:

outputting a first yaw rate value from the first lookup table based on said adjusted handwheel value and said vehicle speed value;

outputting a first side slip value from the second lookup table based on said adjusted handwheel value and said vehicle speed value;

receiving said first yaw rate value and said first side slip value at the filter; and

calculating said desired yaw rate value and said desired side slip value utilizing said filter, based on said first yaw rate value and said first side slip value.

6. A storage medium encoded with

a machine readable computer program code comprising instructions configured to cause a computer to implement a method of implementing a vehicle stability enhancement (VSE) system for a vehicle,

the method further comprising:

receiving a handwheel angle value utilizing said computer;

adjusting said handwheel angle value in response to a variable steering ratio generated in the vehicle, utilizing said computer; and

inputting said adjusted handwheel angle value into a reference model algorithm utilized in said computer, said reference model algorithm outputting at least one of a desired yaw rate and a desired side slip value associated with said vehicle, based on said adjusted handwheel angle value.

7. The storage medium of claim 6, wherein the method further comprises summing an offset angle value with said handwheel angle value to obtain an effective handwheel angle value, said offset angle value being a function of said variable steering ratio.

8. The storage medium of claim 6, wherein the method further comprises inputting a vehicle speed value into said reference model algorithm.

9. The storage medium of claim 6, wherein the method further comprises:

outputting a first yaw rate value from the first lookup table based on said adjusted handwheel value and said vehicle speed value;

outputting a first side slip value from the second lookup table based on said adjusted handwheel value and said vehicle speed value;

receiving said first yaw rate value and said first side slip value at said filter; and

calculating said desired yaw rate value and said desired side slip value utilizing said filter, based on said first yaw rate value and said first side slip value.