US4869335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four-wheel steering system of a motor vehicle
Assignee: Subaru Corp
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Filing: 1988-10-07
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Granted: 1989-09-26
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Expires: 2008-10-07
Abstract
Abstract A system for steering rear wheels of a motor vehicle has a detector for detecting cornering force exerted on front wheels and a speed detector for detecting steering speed of a steering wheel of the vehicle. A desired rear-wheel steering angle is calculated based on the cornering force and vehicle speed, a desired rear-wheel steering speed is obtained from the steering speed and the vehicle speed. In response to the desired rear-wheel steering angle and to the desired rear-wheel steering speed, rear wheels are steered.
Inventors
- 👤 Akira Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:23
CPC Classifications
B; B62; B62D; B62D7/00; B62D7/06; B62D7/14; B62D7/15; B62D7/159
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
142 words
A steering system for a motor vehicle having a front-wheel steering system including a steering wheel, comprising: detector means for detecting force exerted on front wheels and for producing a force signal; speed detector means for detecting rotational speed of the steering wheel and for producing a steering speed signal; a vehicle speed sensor for producing a vehicle speed signal; steering angle detecting means for detecting rear-wheel steering angle and for producing a steering angle signal; calculator means responsive to the force signal and to the vehicle speed signal for producing a desired rear-wheel steering angle signal; calculator means responsive to the steering speed signal and to the vehicle speed signal for producing a desired rear-wheel steering speed signal; rear-wheel steering means responsive to the desired rear-wheel steering angle signal and to the desired rear-wheel steering speed signal for steering rear wheels.
Claim 2
Dependent Claim
142 words
A steering system for a motor vehicle having a front-wheel steering system including a steering wheel, comprising: detector means for detecting force exerted on front wheels and for producing a force signal; speed detector means for detecting rotational speed of the steering wheel and for producing a steering speed signal; a vehicle speed sensor for producing a vehicle speed signal; steering angle detecting means for detecting rear-wheel steering angle and for producing a steering angle signal; calculator means responsive to the force signal and to the vehicle speed signal for producing a desired rear-wheel steering angle signal; calculator means responsive to the steering speed signal and to the vehicle speed signal for producing a desired rear-wheel steering speed signal; rear-wheel steering means responsive to the desired rear-wheel steering angle signal and to the desired rear-wheel steering speed signal for steering rear wheels.
Claim 3
Dependent Claim
19 words
The steering system according to claim 1 wherein the force exerted on the front wheels is a cornering force.
Claim 4
Dependent Claim
24 words
The steering system according to claim 1 wherein the force exerted on the front wheels is an assist torque applied to the steering wheel.
Claim 5
Dependent Claim
24 words
The steering system according to claim 1 wherein the force exerted on the front wheels is a steering force applied to the steering wheel.
Claim 6
Dependent Claim
46 words
The steering system according to claim 1 wherein the desired rear-wheel steering speed signal comprises a first desired speed signal dependent on the steering speed signal and a second desired speed signal dependent on deviation of the steering angle signal from the desired rear-wheel steering angle.
References Cited (Backward Citations)
JPS58164477A
Cited
JPS60183264A
Cited
JPS62187663A
Cited
EP0243180A2
Cited
US4779693A
Cited
JPH0644185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |