US5299648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driver current limiting method in electric power steering apparatus
Assignee: UNISA JKC STEERING SYSTEMS Co Ltd
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Filing: 1992-07-20
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Granted: 1994-04-05
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Expires: 2012-07-20
Abstract
Abstract According to a current limiting method in an electric power steering apparatus, a steering angular speed and the direction of a drive current are monitored. A condition in which a steering wheel is locked is discriminated from a condition in which the steering wheel is turned on the basis of combinations of the steering angular speed and the drive current direction. Processing of limiting a current value of an excessive drive current is executed only when the condition in which the steering wheel is locked is determined.
Inventors
- 👤 Masaki Watanabe
- 👤 Shinobu Kamono
- 👤 Ryuji Lizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:51
CPC Classifications
B; B62; B62D; B62D5/00; B62D5/04; B62D5/0457; B62D5/046; B62D5/0463; B62D5/0469
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
117 words
A drive current limiting method in an electric power steering apparatus, which monitors a magnitude of a drive current supplied to a motor for generating an auxiliary steering torque and limits a current value of an excessively flowing drive current, comprising the steps of: monitoring a steering angular speed and a direction of the drive current; discriminating a condition in which a steering wheel is locked from a condition in which the steering wheel is turned on the basis of combinations of the steering angular speed and the drive current direction; and executing processing of limiting a current value of an excessive drive current only when the condition in which the steering wheel is locked is determined.
Claim 2
Dependent Claim
117 words
A drive current limiting method in an electric power steering apparatus, which monitors a magnitude of a drive current supplied to a motor for generating an auxiliary steering torque and limits a current value of an excessively flowing drive current, comprising the steps of: monitoring a steering angular speed and a direction of the drive current; discriminating a condition in which a steering wheel is locked from a condition in which the steering wheel is turned on the basis of combinations of the steering angular speed and the drive current direction; and executing processing of limiting a current value of an excessive drive current only when the condition in which the steering wheel is locked is determined.
Claim 3
Dependent Claim
35 words
A method according to claim 1, wherein the current limiting processing for the condition in which a steering wheel is locked is executed after the condition in which the steering wheel is turned is checked.
References Cited (Backward Citations)
US4753310A
Cited
US5040630A
Cited
JPH01197169A
Cited
US5182711A
Cited
US5202830A
Cited
US5156227A
Cited
US5150021A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-04-04 | 1997-10-04 | 1998-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-04 | 2001-10-04 | 2002-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-04 | 2005-10-04 | 2006-04-05 | $7700.00 | Window Closed / Lapsed |