US4716982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four wheel steer control system connected with limited slip differential
Assignee: Nissan Motor Co Ltd
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Filing: 1986-11-12
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Granted: 1988-01-05
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Expires: 2006-11-12
Abstract
Abstract A four wheel steer control system includes a four wheel steer system, a differential between right and left driving wheels, a slip limiting system for limiting a differential action of the differential with a slip limiting resistive force whose magnitude is varied in accordance with a vehicle speed or other variable, a sensor for sensing the magnitude of the slip limiting resistive force, and a controller for controlling a ratio of a rear wheel steer angle to a steering wheel angle in accordance with the magnitude of the slip limiting resistive force.
Inventors
- 👤 Katsumi Ishii
- 👤 Kanae Hirayama
- 👤 Yoshio Matsuoka
- 👤 Kotei Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:28
CPC Classifications
B; B62; B62D; B62D7/00; B62D7/06; B62D7/14; B62D7/15; B62D7/1518; B62D7/1545; B60; B60K; B60K23/00; B60K23/04; B62D7/1536
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
A vehicle comprising; a four wheel steer system for varying a rear wheel steer angle in response to a control signal, a differential disposed between right and left drive wheels of said vehicle, slip limiting means for limiting a differential action of said differential, means for sensing a slip limiting amount of said slip limiting means, and controlling means for producing said control signal and controlling a ratio of the rear wheel steer angle to a steering wheel angle in accordance with said slip limiting amount sensed by slip limiting amount sensing means.
Claim 2
Dependent Claim
93 words
A vehicle comprising; a four wheel steer system for varying a rear wheel steer angle in response to a control signal, a differential disposed between right and left drive wheels of said vehicle, slip limiting means for limiting a differential action of said differential, means for sensing a slip limiting amount of said slip limiting means, and controlling means for producing said control signal and controlling a ratio of the rear wheel steer angle to a steering wheel angle in accordance with said slip limiting amount sensed by slip limiting amount sensing means.
Claim 3
Dependent Claim
31 words
A vehicle according to claim 1 wherein said controlling means comprises means for increasing said ratio when slip limiting amount decreases, and for decreasing said ratio when slip limiting amount increases.
Claim 4
Dependent Claim
32 words
A vehicle according to claim 1 wherein said controlling means comprises means for varying said ratio in accordance with slip limiting amount only when vehicle speed is higher than a predetermined speed.
Claim 5
Dependent Claim
28 words
A vehicle according to claim 3 where said controlling means comprises means for controlling said slip limiting means to vary slip limiting amount in accordance with vehicle speed.
Claim 6
Dependent Claim
27 words
A vehicle according to claim 4 wherein said controlling means comprises means for controlling said slip limiting means to increase slip limiting amount when vehicle speed increases.
Claim 7
Dependent Claim
44 words
A vehicle according to claim 5 wherein said slip limiting means comprises a friction clutch for limiting said differential action of said differential with a resistive force, and said slip limiting amount is a magnitude of said resistive force developed by said friction clutch.
References Cited (Backward Citations)
JPS5576766A
Cited
US4633735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-04 | 1991-07-06 | 1992-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-04 | 1995-07-06 | 1996-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-04 | 1999-07-06 | 2000-01-05 | $7700.00 | Window Closed / Lapsed |