US5009294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle traction control system
Assignee: GM Global Technology Operations LLC
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Filing: 1990-01-19
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Granted: 1991-04-23
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Expires: 2010-01-19
Abstract
Abstract A vehicle traction control system includes both driven wheel brake control and engine torque output control for limiting acceleration wheel slip. A boundary condition is identified where engine torque output control alone can be used without braking to regulate the acceleration wheel slip to any desired value. When the traction control system determines that the boundary condition is not exceeded such that engine torque output control alone is capable of preventing an excessive slip condition, only engine torque is controlled to limit wheel slip. However, when the system determines the boundary condition is such that engine torque output control alone will not prevent an excessive slip condition, the brakes of the slipping wheel is then additionally controlled to limit acceleration wheel spin.
Inventors
- 👤 Youssef A. Ghoneim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:32
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/175; B60K; B60K28/00; B60K28/10; B60K28/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
156 words
A traction control method for a vehicle having an engine for applying a driving torque to a driven wheel and having a brake for braking the driven wheel, the method comprising the steps of: determining a wheel slip condition of the driven wheel; controlling the driving torque applied to the driven wheel by the engine, when the determined wheel slip condition represents an excessive acceleration wheel slip condition, in direction to limit wheel slip to a desired slip value λ * ; determining a condition where using only the step of controlling the driving torque would be incapable of preventing a trajectory of wheel slip from exceeding a predetermined maximum allowable slip value λ x ; and controlling the brake for braking the driven wheel when it is determined that the step of controlling the driving torque would be incapable of preventing the trajectory of wheel slip from exceeding the predetermined maximum value λ x .
Claim 2
Dependent Claim
156 words
A traction control method for a vehicle having an engine for applying a driving torque to a driven wheel and having a brake for braking the driven wheel, the method comprising the steps of: determining a wheel slip condition of the driven wheel; controlling the driving torque applied to the driven wheel by the engine, when the determined wheel slip condition represents an excessive acceleration wheel slip condition, in direction to limit wheel slip to a desired slip value λ * ; determining a condition where using only the step of controlling the driving torque would be incapable of preventing a trajectory of wheel slip from exceeding a predetermined maximum allowable slip value λ x ; and controlling the brake for braking the driven wheel when it is determined that the step of controlling the driving torque would be incapable of preventing the trajectory of wheel slip from exceeding the predetermined maximum value λ x .
Claim 3
Dependent Claim
30 words
The traction control method of claim 1 wherein the step of controlling the brake controls the brake in direction to limit wheel slip to the desired value λ * .
Claim 4
Dependent Claim
137 words
The traction control method of claim 2 wherein the step of determining a condition where using only the step of controlling the driving torque would be incapable of preventing the trajectory of wheel slip from exceeding a predetermined maximum allowable slip value λ x includes: determining wheel slip λ n ; determining slip error Δλ n in accord with the expression Δλ n =λ n -λ * ; and determining a rate of change Δλ in the determined slip error Δλ n , the condition where using only the step of controlling the driving torque would be incapable of preventing the trajectory of wheel slip from exceeding a predetermined maximum allowable slip value λ x being represented by the determined rate of change Δλ in the determined slip error exceeding a predetermined threshold value Δλ Th .
Claim 5
Dependent Claim
114 words
The traction control method of claim 1 wherein the step of determining a condition where using only the step of controlling the driving torque would be incapable of preventing the trajectory of wheel slip from exceeding a predetermined maximum allowable slip value λ x includes: determining wheel slip λ n ; determining the rate of change λ in the determined wheel slip λ n , the condition where using only the step of controlling the driving torque would be incapable of preventing the trajectory of wheel slip from exceeding a predetermined maximum allowable slip value λ x being represented by the determined rate of change λ exceeding a predetermined threshold value λ m .
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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) | 1994-04-22 | 1994-10-22 | 1995-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-22 | 1998-10-22 | 1999-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-22 | 2002-10-22 | 2003-04-23 | $7700.00 | Window Closed / Lapsed |