US5067578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Traction control system for motor vehicles
Assignee: Akebono Brake Industry Co Ltd
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Filing: 1990-10-03
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Granted: 1991-11-26
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Expires: 2010-10-03
Abstract
Abstract In a traction control system for motor vehicles, a lower limit for throttle opening degree command with respect to each gear position of transmission is set up, and when the transmission is shifted up, the throttle opening degree command is decreased down to the lower limit for throttle opening degree command corresponding to the gear position assumed through the shift-up operation.
Inventors
- 👤 Akihiro Shirata
- 👤 Hideaki Watanabe
- 👤 Naoyuki Hagiya
- 👤 Satomi Ookubo
- 👤 Shigeki Moride
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:51
CPC Classifications
F; F02; F02D; F02D35/00; F02D35/0007; B; B60; B60K; B60K28/00; B60K28/10; B60K28/16; F02D11/00; F02D11/06; F02D11/10; F02D11/105
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
173 words
A traction control system for a motor vehicle having a throttle, and a transmission; said system comprising: means for detecting driving wheel slip, means for changing a command value for opening the throttle depending on said driving wheel slip, means for controlling the degree of opening of the throttle in accordance with the throttle opening degree command value to restrain said driving wheel slip; means for detecting each gear position of the transmission; means for setting a lower limit value for the throttle opening degree command value with respect to each gear position of the transmission as detected; said means for setting a lower limit value including means for setting a different value for each respective gear position so that each value is different from any other value and corresponds to a different degree of opening for the throttle then for any other value; and means, for causing said throttle opening degree command value to be decreased down to the lower limit value upon a gear change of the transmission up or down.
Claim 2
Dependent Claim
173 words
A traction control system for a motor vehicle having a throttle, and a transmission; said system comprising: means for detecting driving wheel slip, means for changing a command value for opening the throttle depending on said driving wheel slip, means for controlling the degree of opening of the throttle in accordance with the throttle opening degree command value to restrain said driving wheel slip; means for detecting each gear position of the transmission; means for setting a lower limit value for the throttle opening degree command value with respect to each gear position of the transmission as detected; said means for setting a lower limit value including means for setting a different value for each respective gear position so that each value is different from any other value and corresponds to a different degree of opening for the throttle then for any other value; and means, for causing said throttle opening degree command value to be decreased down to the lower limit value upon a gear change of the transmission up or down.
Claim 3
Dependent Claim
136 words
A traction control system according to claim 1 wherein said means for setting a limit valve provides signals representing a lower limit value a for a throttle opening degree command value with respect to a first gear speed position of the transmission, a lower limit value b for a throttle opening degree command value with respect to a second gear speed position of the transmission, a lower limit value c for a throttle opening degree command value with respect to a third gear speed position of the transmission, a lower limit value d for a throttle opening degree command value with respect to a fourth gear speed position of the transmission and a lower limit value e for the throttle opening degree command with respect to a fifth gear speed position of the transmission where a<b<c<d<e.
Claim 4
Dependent Claim
95 words
A traction control system according to claim 1, further comprising: means for computing a reference speed Vr on the basis of lefthand and righthand driving wheel speeds VdL and VdR; means for setting up a control threshold value Vs by adding a predetermined value Vk to a computed vehicle speed Vv computed on the basis of lefthand and righthand non-driving wheel speeds VnL and VnR; and means arranged, when the motor vehicle starts running, for starting throttle closing control at a point of time when said reference speed Vr exceeds said control threshold value Vs.
Claim 5
Dependent Claim
28 words
A traction control system according to claim 3, wherein said reference speed Vv is the mean value of the lefthand and righthand driving wheel speeds VdL and VdR.
Claim 6
Dependent Claim
34 words
A traction control system according to claim 3, wherein said computed vehicle speed Vv is computed on the basis of the higher one of the lefthand and righthand non-driving wheel speeds VnL and VnR.
Claim 7
Dependent Claim
53 words
A traction control system according to claim 1, wherein a notional vehicle speed EVv is set up on the basis of engine speed, and gear position of transmission without taking into account of clutch slip; and said notional vehicle speed EVv is compared with said control threshold value Vs to effect throttle control.
Claim 8
Dependent Claim
50 words
A traction control system according to claim 1, wherein said transmission assumes first to fifth-speed gear positions; and lower limits a, b, c, d and e for throttle opening degree command are set up with respect to the first- to fifth-speed gear positions respectively in such a relationship that a<b<c<d<e.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |