US5465210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for determining a vehicle steering wheel center position
Assignee: GM Global Technology Operations LLC
•
Filing: 1994-08-18
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Granted: 1995-11-07
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Expires: 2014-08-18
Abstract
Abstract A method for determining the center position of a steering wheel for a vehicle equipped with electric power steering having a brushless motor. Vehicle operating conditions corresponding to a straight direction of vehicle travel are detected. An estimated center position of the brushless motor is determined while the vehicle operating conditions are detected. A range of angular positions about the estimated center position is established in which the actual center position of the steering wheel is determined to be the position of the brushless motor equal to a midpoint of the range of angular positions.
Inventors
- 👤 Allen J. Walenty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:34
CPC Classifications
B; B62; B62D; B62D15/00; B62D15/02; B62D15/021; B62D15/0235; B62D15/0245
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
A method for determining a center position of a steering wheel for a vehicle equipped with electric power steering having a brushless motor, the method comprising: detecting vehicle operating conditions corresponding to a straight direction of vehicle travel; estimating a center position of the brushless motor when the vehicle operating conditions are detected; establishing a range of angular positions of the brushless motor about the estimated center position, the range having a minimum and maximum position; and determining the center position of the steering wheel as an angular position of the brushless motor equal to a midpoint of the range of angular positions.
Claim 2
Independent Claim
103 words
A method for determining a center position of a steering wheel for a vehicle equipped with electric power steering having a brushless motor, the method comprising: detecting vehicle operating conditions corresponding to a straight direction of vehicle travel; estimating a center position of the brushless motor when the vehicle operating conditions are detected; establishing a range of angular positions of the brushless motor about the estimated center position, the range having a minimum and maximum position; and determining the center position of the steering wheel as an angular position of the brushless motor equal to a midpoint of the range of angular positions.
Claim 3
Dependent Claim
140 words
The method according to claim 1, wherein detecting vehicle operating conditions corresponding to a straight direction of vehicle travel comprises: sensing an angular position of the brushless motor; sensing a torque developed by the steering wheel; sensing a vehicle speed; determining a change in the sensed angular position of the brushless motor over a first predetermined time period; determining a change in the sensed torque developed by the steering wheel over a second predetermined time period; and detecting a straight direction of vehicle travel when (i) sensed vehicle speed is greater than a predetermined vehicle speed, (ii) the change in sensed torque is less than a predetermined change in torque, (iii) the change in sensed angular position of the brushless motor is less than a predetermined change in angular position, and (iv) sensed torque is less than a predetermined torque.
Claim 4
Dependent Claim
90 words
The method according to claim 1, wherein establishing a range of angular positions of the brushless motor about the estimated center position comprises: determining whether the estimated center position is one of less than the minimum position and greater than the maximum position of the range of angular positions; equating the minimum position with the estimated center position when the estimated center position is less than the minimum limit; and equating the maximum position with the estimated center position when the estimated center position is greater than the maximum limit.
Claim 5
Dependent Claim
48 words
The method according to claim 1, further comprising: determining a difference between the center position of the steering wheel and a predetermined center position; and indicating when the difference between the center position of the steering wheel and a predetermined center position is greater than a predetermined difference.
Claim 6
Dependent Claim
56 words
The method according to claim 3, further comprising: identifying a finite span of the range of angular positions as a difference between the minimum and maximum angular positions when the difference between the minimum and maximum angular positions remains unchanged over a predetermined time period; and limiting the range of angular positions to the finite span.
Claim 7
Dependent Claim
63 words
The method according to claim 1, further comprising: sensing an angular position of the brushless motor; sensing a vehicle speed; and updating the estimated center position by a percentage of a difference between the sensed angular position of the brushless motor and the estimated center position, the percentage being a function of the sensed vehicle speed with respect to a predetermined vehicle speed.
References Cited (Backward Citations)
US4996657A
Cited
US4979114A
Cited
US4961474A
Cited
US5076381A
Cited
US5097918A
Cited
US5032996A
Cited
US5065324A
Cited
US5203420A
Cited
US5121322A
Cited
US4999776A
Cited
US5253172A
Cited
US5198981A
Cited
US5282135A
Cited
US5283740A
Cited
US5243188A
Cited
US5311432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-11-06 | 1999-05-08 | 1999-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-11-06 | 2003-05-08 | 2003-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-11-06 | 2007-05-08 | 2007-11-07 | $7700.00 | Window Closed / Lapsed |