Method and apparatus to control slippage or spinning of driven wheels of a vehicle
First Claim
1. Method of controlling or spinning of driven wheels of a vehicle having a drive engine, to furnish tractive effort and provide drive torque to the driven wheels using the steps ofgenerating driven wheel speed signals (V1, V2) representative of rotary speed of the wheels of the vehicle;
- generating a vehicle speed signal (VRef) representative of the speed of movement of the vehicle;
generating a wheel slip signal (9a, 9b) if the rotary speed of any one of the driven wheels indicates that the wheel is slipping or spinning;
controlling the drive torque applied on the driven wheels in a direction to reduce drive torque, and hence wheel speed, in a dependence on presence of a wheel slip signal from at least one of the wheels;
and comprising, in accordance with the invention, the step of applying a braking effort only to that one of the driven wheels which, first provides a wheel slip signal, while leaving another driven wheel uncontrolled and permitting at least initially slippage thereof; and
controlling the output torque of the engine in a direction to reduce the output torque of the engine only after the braking effort applied to said one of the driven wheels has resulted in an essential termination of slippage of said one driven wheel.
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Accused Products
Abstract
To prevent undue low operating speed of an automotive vehicle engine if slippage of a driven wheel is sensed, the speeds of the driven wheels are sensed, and, when one of the driven wheels first exceeds a reference level, a braking effort is applied thereto, the other wheel, however, being permitted to slip or spin until the other wheel has reached either a predetermined speed, at which it is then selectively braked, or the engine has reached a predetermined engine speed level (nmin), after which time the other wheel then can also be braked, or the spinning decreases due to lesser power being applied by the engine.
36 Citations
10 Claims
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1. Method of controlling or spinning of driven wheels of a vehicle having a drive engine, to furnish tractive effort and provide drive torque to the driven wheels using the steps of
generating driven wheel speed signals (V1, V2) representative of rotary speed of the wheels of the vehicle; -
generating a vehicle speed signal (VRef) representative of the speed of movement of the vehicle; generating a wheel slip signal (9a, 9b) if the rotary speed of any one of the driven wheels indicates that the wheel is slipping or spinning; controlling the drive torque applied on the driven wheels in a direction to reduce drive torque, and hence wheel speed, in a dependence on presence of a wheel slip signal from at least one of the wheels; and comprising, in accordance with the invention, the step of applying a braking effort only to that one of the driven wheels which, first provides a wheel slip signal, while leaving another driven wheel uncontrolled and permitting at least initially slippage thereof; and controlling the output torque of the engine in a direction to reduce the output torque of the engine only after the braking effort applied to said one of the driven wheels has resulted in an essential termination of slippage of said one driven wheel. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Control apparatus to control slippage or spinning of driven wheels of a vehicle driven by an engine, to maintain tractive effort
comprising: -
means providing a first wheel speed signal (V1) representative of the speed of a driven wheel; means providing a second wheel speed signal (V2) representative of the wheel speed of another driven wheel; means (11) providing a speed reference signal; means for recognizing which ones of the driven wheel speed signals exceed the reference speed signal; and logic circuit means (15a, 15b, 16a, 16b) applying a braking effort to that one of the wheels which is recognized as having a speed in excess of the reference speed, while inhibiting applying a braking effort to the other driven wheel or wheels supplying the other driven wheel speed signal. - View Dependent Claims (9, 10)
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Specification