US4866623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controller for an acceleration slip on a driving wheel
Assignee: Toyota Motor Corp
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Filing: 1987-12-08
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Granted: 1989-09-12
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Expires: 2007-12-08
Abstract
Abstract A controller for controlling an acceleration slip on a driving wheel of a vehicle comprising a vehicle speed detector, a driving wheel speed detector, a reference speed setting device for setting low and high reference speeds both higher than the detected vehicle speed, and engine output controller for executing a feedback control of an output of the engine of the vehicle so that the detected speed of the driving wheel approximates the low reference speed, a brake controller for executing a feedback control of a brake system of the driving wheel after the detected speed of the driving wheel exceeds the high reference speed, a brake monitor for detecting whether the brake control is executed, and a gain adjustor for making a feedback gain of the engine output control lower at a time when the brake control is detected as being executed than at a time when the brake control is detected as not being executed.
Inventors
- 👤 Kiyotaka Ise
- 👤 Shinichi Matsumoto
- 👤 Hiroharu Miyazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:37
CPC Classifications
B; B60; B60W; B60W10/00; B60W10/04; B60W10/06; B60K; B60K28/00; B60K28/10; B60K28/16; B60T; B60T8/00; B60T8/17; B60T8/175; B60W10/18; B60W30/00; B60W30/18; B60W30/18172; B60W30/1819; B60W50/00; B60W2050/0001; B60W2050/0019; B60W2050/0022
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
192 words
A controller for controlling an acceleration slip on a driving wheel of a vehicle comprising: vehicle speed detection means for detecting a speed of the vehicle; driving wheel speed detection means for detecting a speed of the driving wheel; processor means for controlling the acceleration slip, said processor means including reference speed setting means responsive to the detected vehicle speed for setting a low reference speed and a high reference speed both higher than the detected vehicle speed; engine output control means for executing a feedback control of an output of the engine of the vehicle so that the detected speed of the driving wheel approximates the low reference speed; brake control means for executing a feedback control of a brake system of the driving wheel after the detected speed of the driving wheel exceeds the high reference speed; brake monitoring means for detecting whether the brake control is executed; and gain adjusting means for making a feedback gain of the engine output control means lower at a time when the brake control is detected to be executed than at a time when the brake control is detected not to be executed.
Claim 2
Dependent Claim
192 words
A controller for controlling an acceleration slip on a driving wheel of a vehicle comprising: vehicle speed detection means for detecting a speed of the vehicle; driving wheel speed detection means for detecting a speed of the driving wheel; processor means for controlling the acceleration slip, said processor means including reference speed setting means responsive to the detected vehicle speed for setting a low reference speed and a high reference speed both higher than the detected vehicle speed; engine output control means for executing a feedback control of an output of the engine of the vehicle so that the detected speed of the driving wheel approximates the low reference speed; brake control means for executing a feedback control of a brake system of the driving wheel after the detected speed of the driving wheel exceeds the high reference speed; brake monitoring means for detecting whether the brake control is executed; and gain adjusting means for making a feedback gain of the engine output control means lower at a time when the brake control is detected to be executed than at a time when the brake control is detected not to be executed.
Claim 3
Dependent Claim
23 words
The acceleration slip controller according to claim 1 wherein the vehicle speed detection means comprises a speed detector provided on a non-driving wheel.
Claim 4
Dependent Claim
33 words
The acceleration slip controller according to claim 1 wherein the reference speed setting means sets the low and high reference speeds by multiplying the detected vehicle speed by predetermined values greater than unity.
Claim 5
Dependent Claim
30 words
The acceleration slip controller according to claim 1 wherein the reference speed setting means sets the low and high reference speeds by adding predetermined values to the detected vehicle speed.
Claim 6
Dependent Claim
32 words
The acceleration slip controller according to claim 1 wherein the low reference speed is set at a value at which friction between the driving wheel and the road surface is a maximum.
Claim 7
Dependent Claim
40 words
The acceleration slip controller according to claim 1 wherein the engine of the vehicle comprises a sub-throttle valve provided in series with a normally provided throttle valve, and the engine output control means controls the opening of the sub-throttle valve.
Claim 8
Dependent Claim
40 words
The acceleration slip controller according to claim 6 wherein the brake monitoring means determines that the brake control means is not executed when an accumulated hydraulic pressure control signal to the brake system becomes equal to or less than zero.
Claim 9
Dependent Claim
24 words
The acceleration slip controller according to claim 1 wherein the engine output control means controls the opening of a throttle valve of the engine.
Claim 10
Dependent Claim
68 words
The acceleration slip controller according to claim 8 wherein an opening/closing speed θs of the throttle valve is controlled according to a formula θs=K(α·ΔV+β·ΔV), where K is a coefficient depending on the engine conditions, α and β are coefficients depending on the braking control condition, ΔV=VS-VR, ΔV is a change rate of ΔV, VR is an actual speed of the driven wheel and VS is a target speed.
Claim 11
Dependent Claim
45 words
The acceleration slip controller according to claim 9 wherein the coefficients α and β are set at lower values at a time when the brake control is detected to be executed than at a time when the brake control is detected not to be executed.
Claim 12
Dependent Claim
25 words
The acceleration slip controller according to claim 9 wherein the coefficient β is set at zero when the brake control is detected to be executed.
Claim 13
Independent Claim
133 words
A method for controlling an acceleration slip on a driving wheel of a vehicle having steps of: detecting a speed of the vehicle; detecting a speed of the driving wheel; setting a low reference speed and a high reference speed both higher than the detected vehicle speed; executing a feedback control of an output of the engine of the vehicle so that the detected speed of the driving wheel approximates the low reference speed; executing a feedback control of a brake system of the driving wheel after the detected speed of the driving wheel exceeds the high reference speed; and controlling the feedback gain of the engine output control so as to lower at a time when the brake control is executed than at a time when the brake control is not executed.
Claim 14
Independent Claim
133 words
A method for controlling an acceleration slip on a driving wheel of a vehicle having steps of: detecting a speed of the vehicle; detecting a speed of the driving wheel; setting a low reference speed and a high reference speed both higher than the detected vehicle speed; executing a feedback control of an output of the engine of the vehicle so that the detected speed of the driving wheel approximates the low reference speed; executing a feedback control of a brake system of the driving wheel after the detected speed of the driving wheel exceeds the high reference speed; and controlling the feedback gain of the engine output control so as to lower at a time when the brake control is executed than at a time when the brake control is not executed.
References Cited (Backward Citations)
US3932000A
Cited
US3967862A
Cited
US4078845A
Cited
US4188075A
Cited
US4583611A
Cited
US4681373A
Cited
US4648663A
Cited
US4681374A
Cited
US4722411A
Cited
US4774667A
Cited
JPS62149545A
Cited
US4739856A
Cited
JPH06185248A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-11 | 1993-03-13 | 1993-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-11 | 1997-03-13 | 1997-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-11 | 2001-03-13 | 2001-09-12 | $7700.00 | Window Closed / Lapsed |