US5636121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Traction control system for motor vehicle
Assignee: Mazda Motor Corp
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Filing: 1994-12-21
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Granted: 1997-06-03
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Expires: 2014-12-21
Abstract
Abstract A traction control system for a motor vehicle has a four wheel steering device for controlling a steering characteristic of the vehicle based on a yaw rate difference between an actual yaw rate and a target yaw rate of the vehicle. The traction control system further has a device for controlling driven torque applied to a driven wheel while a slip is generated in the driven wheel. A correction device is used for correcting the driven torque to be small as a wheel steering angle becomes large while the four wheel steering device is operated.
Inventors
- 👤 Toshiaki Tsuyama
- 👤 Sotetsu Yoshida
- 👤 Yoshihisa Nakamoto
- 👤 Yoshinori Fukumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:22
CPC Classifications
B; B62; B62D; B62D7/00; B62D7/06; B62D7/14; B62D7/15; B62D7/159; B60; B60T; B60T8/00; B60T8/17; B60T8/175; B60T8/1755; B60T2210/00; B60T2210/10; B60T2210/14; B60T2260/00; B60T2260/02; B60T2260/022; B60T2260/024; B60W; B60W2520/00; B60W2520/14; B60W2540/00; B60W2540/18
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
100 words
A traction control system for a motor vehicle comprising: steering characteristic control means for controlling a steering characteristic of the vehicle based on a yaw rate difference between an actual yaw rate and a target yaw rate of the vehicle; driven torque control means for controlling driven torque applied to a driven wheel while a slip is generated in the driven wheel; and driven torque correction means for correcting the driven torque so as to decrease as a wheel steering angle increases while said yaw rate difference stays within a particular range and said steering characteristic control means is operated.
Claim 2
Dependent Claim
100 words
A traction control system for a motor vehicle comprising: steering characteristic control means for controlling a steering characteristic of the vehicle based on a yaw rate difference between an actual yaw rate and a target yaw rate of the vehicle; driven torque control means for controlling driven torque applied to a driven wheel while a slip is generated in the driven wheel; and driven torque correction means for correcting the driven torque so as to decrease as a wheel steering angle increases while said yaw rate difference stays within a particular range and said steering characteristic control means is operated.
Claim 3
Dependent Claim
96 words
A traction control system for a motor vehicle comprising: steering characteristic control means for controlling a steering characteristic of the vehicle based on a yaw rate difference between an actual yaw rate and a target yaw rate of the vehicle; driven torque control means for controlling driven torque applied to a driven wheel while a slip is generated in the driven wheel; and driven torque correction means for correcting the driven torque so as to decrease as both the yaw rate difference and a wheel steering angle increase while said steering characteristic control means is operated.
Claim 4
Dependent Claim
96 words
A traction control system for a motor vehicle comprising: steering characteristic control means for controlling a steering characteristic of the vehicle based on a yaw rate difference between an actual yaw rate and a target yaw rate of the vehicle; driven torque control means for controlling driven torque applied to a driven wheel while a slip is generated in the driven wheel; and driven torque correction means for correcting the driven torque so as to decrease as both the yaw rate difference and a wheel steering angle increase while said steering characteristic control means is operated.
Claim 5
Dependent Claim
41 words
A traction control system according to claim 2, wherein said driven torque correction means controls a correction by which the driven torque is decreased when both the wheel steering angle and the yaw rate difference are no greater than predetermined values.
Claim 6
Dependent Claim
42 words
A traction control system according to claim 2, wherein said driven torque correction means prohibits the driven torque from being corrected so as to decrease when both the wheel steering angle and the yaw rate difference are no greater than predetermined values.
Claim 7
Dependent Claim
141 words
A traction control system for a motor vehicle comprising: steering characteristic control means for controlling a steering characteristic of the vehicle based on a yaw rate difference between an actual yaw rate and a target yaw rate of the vehicle; target slip value providing means for providing a target slip value in a driven wheel; driven torque control means for controlling driven torque applied to the driven wheel so that a slip in the driven wheel becomes equal to the target slip value while the slip is generated in the driven wheel; and target slip value correction means for weighting a wheel steering angle and the yaw rate difference and correcting the target slip value so that it decreases as the wheel steering angle and the yaw rate difference are more heavily weighted while said steering characteristic control means is operated.
Claim 8
Dependent Claim
141 words
A traction control system for a motor vehicle comprising: steering characteristic control means for controlling a steering characteristic of the vehicle based on a yaw rate difference between an actual yaw rate and a target yaw rate of the vehicle; target slip value providing means for providing a target slip value in a driven wheel; driven torque control means for controlling driven torque applied to the driven wheel so that a slip in the driven wheel becomes equal to the target slip value while the slip is generated in the driven wheel; and target slip value correction means for weighting a wheel steering angle and the yaw rate difference and correcting the target slip value so that it decreases as the wheel steering angle and the yaw rate difference are more heavily weighted while said steering characteristic control means is operated.
Claim 9
Dependent Claim
26 words
A traction control system according to claim 5, wherein said target slip value correction means weights the wheel steering angle more than the yaw rate difference.
Claim 10
Dependent Claim
122 words
A traction control system for a motor vehicle comprising: steering characteristic control means for controlling a steering characteristic of the vehicle based on a yaw rate difference between an actual yaw rate and a target yaw rate of the vehicle; target slip value providing means for providing a target slip value in a driven wheel; driven torque control means for controlling driven torque applied to the driven wheel so that a slip in the driven wheel becomes equal to the target slip value while the slip is generated in the driven wheel; and target slip value correction means for correcting the target slip value so that it decreases as the yaw rate difference increases while said steering characteristic control means is operated.
Claim 11
Dependent Claim
122 words
A traction control system for a motor vehicle comprising: steering characteristic control means for controlling a steering characteristic of the vehicle based on a yaw rate difference between an actual yaw rate and a target yaw rate of the vehicle; target slip value providing means for providing a target slip value in a driven wheel; driven torque control means for controlling driven torque applied to the driven wheel so that a slip in the driven wheel becomes equal to the target slip value while the slip is generated in the driven wheel; and target slip value correction means for correcting the target slip value so that it decreases as the yaw rate difference increases while said steering characteristic control means is operated.
Claim 12
Dependent Claim
122 words
A traction control system for a motor vehicle comprising: steering characteristic control means for controlling a steering characteristic of the vehicle based on a yaw rate difference between an actual yaw rate and a target yaw rate of the vehicle; target slip value providing means for providing a target slip value in a driven wheel; driven torque control means for controlling driven torque applied to the driven wheel so that a slip in the driven wheel becomes equal to the target slip value while the slip is generated in the driven wheel; and target slip value correction means for correcting the target slip value so that it decreases as a wheel steering angle increases while said steering characteristic control means is operated.
Claim 13
Dependent Claim
122 words
A traction control system for a motor vehicle comprising: steering characteristic control means for controlling a steering characteristic of the vehicle based on a yaw rate difference between an actual yaw rate and a target yaw rate of the vehicle; target slip value providing means for providing a target slip value in a driven wheel; driven torque control means for controlling driven torque applied to the driven wheel so that a slip in the driven wheel becomes equal to the target slip value while the slip is generated in the driven wheel; and target slip value correction means for correcting the target slip value so that it decreases as a wheel steering angle increases while said steering characteristic control means is operated.
Claim 14
Dependent Claim
139 words
A traction control system for a motor vehicle comprising: steering characteristic control means for controlling a steering characteristic of the vehicle based on a yaw rate difference between an actual yaw rate and a target yaw rate of the vehicle; driven torque control means for controlling driven torque applied to a driven wheel while a slip is generated in the driven wheel; rough road determination means for determining a rough road; rough road correction means for correcting the driven torque so that the vehicle becomes stable when the rough road is determined; and rough road correction changing means for changing the corrected driven torque so that it decreases when the rough road is determined and both a wheel steering angle and the yaw rate difference are no less than predetermined values while said steering characteristic control means is operated.
Claim 15
Dependent Claim
139 words
A traction control system for a motor vehicle comprising: steering characteristic control means for controlling a steering characteristic of the vehicle based on a yaw rate difference between an actual yaw rate and a target yaw rate of the vehicle; driven torque control means for controlling driven torque applied to a driven wheel while a slip is generated in the driven wheel; rough road determination means for determining a rough road; rough road correction means for correcting the driven torque so that the vehicle becomes stable when the rough road is determined; and rough road correction changing means for changing the corrected driven torque so that it decreases when the rough road is determined and both a wheel steering angle and the yaw rate difference are no less than predetermined values while said steering characteristic control means is operated.
Claim 16
Dependent Claim
24 words
A slip control system according to claim 9, wherein said rough road correction means increases the driven torque so that the vehicle is accelerated.
Claim 17
Dependent Claim
24 words
A slip control system according to claim 9, wherein said rough road correction means decreases the driven torque so that the vehicle is decelerated.
Claim 18
Dependent Claim
128 words
A traction control system for a motor vehicle comprising: steering characteristic control means for controlling a steering characteristic of the vehicle based on a yaw rate difference between an actual yaw rate and a target yaw rate of the vehicle; driven torque control means for controlling driven torque applied to a driven wheel while a slip is generated in the driven wheel; rough road determination means for determining a rough road; rough road correction means for correcting the driven torque so that the vehicle becomes stable when the rough road is determined; and rough road correction changing means for changing the corrected driven torque so that it decreases as a wheel steering angle increases while said steering characteristic control means is operated when the rough road is determined.
Claim 19
Dependent Claim
128 words
A traction control system for a motor vehicle comprising: steering characteristic control means for controlling a steering characteristic of the vehicle based on a yaw rate difference between an actual yaw rate and a target yaw rate of the vehicle; driven torque control means for controlling driven torque applied to a driven wheel while a slip is generated in the driven wheel; rough road determination means for determining a rough road; rough road correction means for correcting the driven torque so that the vehicle becomes stable when the rough road is determined; and rough road correction changing means for changing the corrected driven torque so that it decreases as a wheel steering angle increases while said steering characteristic control means is operated when the rough road is determined.
Claim 20
Dependent Claim
24 words
A slip control system according to claim 12, wherein said rough road correction means increases the driven torque so that the vehicle is accelerated.
Claim 21
Dependent Claim
24 words
A slip control system according to claim 12, wherein said rough road correction means decreases the driven torque so that the vehicle is decelerated.
Claim 22
Dependent Claim
124 words
A traction control system for a motor vehicle comprising: steering characteristic control means for controlling a steering characteristic of the vehicle based on a yaw rate difference between an actual yaw rate and a target yaw rate of the vehicle; driven torque control means for controlling driven torque applied to a driven wheel while a slip is generated in the driven wheel; rough road determination means for determining a rough road; rough road correction means for correcting the driven torque so that the vehicle becomes stable when the rough road is determined; and rough road correction changing means for decreasing the corrected driven torque as the yaw rate difference increases while said steering characteristic control means is operated when the rough road is determined.
Claim 23
Dependent Claim
124 words
A traction control system for a motor vehicle comprising: steering characteristic control means for controlling a steering characteristic of the vehicle based on a yaw rate difference between an actual yaw rate and a target yaw rate of the vehicle; driven torque control means for controlling driven torque applied to a driven wheel while a slip is generated in the driven wheel; rough road determination means for determining a rough road; rough road correction means for correcting the driven torque so that the vehicle becomes stable when the rough road is determined; and rough road correction changing means for decreasing the corrected driven torque as the yaw rate difference increases while said steering characteristic control means is operated when the rough road is determined.
Claim 24
Dependent Claim
24 words
A slip control system according to claim 15, wherein said rough road correction means increases the driven torque so that the vehicle is accelerated.
Claim 25
Dependent Claim
24 words
A slip control system according to claim 15, wherein said rough road correction means decreases the driven torque so that the vehicle is decelerated.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-06-02 | 2000-12-02 | 2001-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-02 | 2004-12-02 | 2005-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-02 | 2008-12-02 | 2009-06-03 | $7700.00 | Window Closed / Lapsed |