Throttle traction control for automotive vehicle
First Claim
1. Method of controlling wheel slippage upon acceleration of a motor vehicle having an engine controlled by a power control, said vehicle having driven wheels driven by said engine and nondriven wheels, comprising the steps of generating wheel speed signals representing the wheel speeds of the wheels of the vehicle, determining a wheel slippage condition of at least one of said wheels from said wheel speed signals in response to slipping of a wheel of the vehicle, and calculating a control signal controlling the power control of the engine to a controlled level less than the level established by the vehicle operator in response to the wheel slippage condition, calculating a driven wheel average wheel speed variable equal to the average wheel speeds of said driven wheels, calculating a nondriven wheel average wheel speed variable equal to the average wheel speeds of the nondriven wheel, calculating an error variable equal to the difference between the driven wheel average wheel speed signal and the nondriven wheel average wheel speed signal, recalculating said error variable during each of successive time periods, calculating a difference variable equal to the difference between the error variables calculated in successive time periods, and recalculating said control signal in each of said successive time periods as a function of the error variable and the difference variable.
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Accused Products
Abstract
An engine traction control system generates a control cycle of a varying duty cycle which controls the pressure level in a pneumatic actuator in the engine power control linkage to thereby reduce engine power when the driven wheels begin slipping during the vehicle acceleration. The duty cycle is set as a function of wheel speed error between the average wheel speeds of the driven and non-driven wheels, and also as a function of the change in the error between calculation cycles.
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Citations
14 Claims
- 1. Method of controlling wheel slippage upon acceleration of a motor vehicle having an engine controlled by a power control, said vehicle having driven wheels driven by said engine and nondriven wheels, comprising the steps of generating wheel speed signals representing the wheel speeds of the wheels of the vehicle, determining a wheel slippage condition of at least one of said wheels from said wheel speed signals in response to slipping of a wheel of the vehicle, and calculating a control signal controlling the power control of the engine to a controlled level less than the level established by the vehicle operator in response to the wheel slippage condition, calculating a driven wheel average wheel speed variable equal to the average wheel speeds of said driven wheels, calculating a nondriven wheel average wheel speed variable equal to the average wheel speeds of the nondriven wheel, calculating an error variable equal to the difference between the driven wheel average wheel speed signal and the nondriven wheel average wheel speed signal, recalculating said error variable during each of successive time periods, calculating a difference variable equal to the difference between the error variables calculated in successive time periods, and recalculating said control signal in each of said successive time periods as a function of the error variable and the difference variable.
- 8. System for controlling wheel slippage upon acceleration of a motor vehicle having driven and nondriven wheels and an engine controlled by a power control controlled by the vehicle operator comprising wheel speed generating means for generating wheel speed signals representing wheel speeds of the wheels of the vehicle, calculation means responsive to said wheel speed signals for detecting a wheel slippage condition upon acceleration of the vehicle and generating a control signal in response thereto, and actuating means responsive to said control signal for adjusting said power control in response to the wheel slippage condition, said calculation means including means for calculating a driven wheel average wheel speed variable equal to the average wheel speeds of said driven wheels, means for calculating a nondriven wheel average wheel speed variable equal to the average wheel speeds of the nondriven wheel, means for calculating an error variable equal to the difference between the driven wheel average wheel speed signal and the nondriven wheel average wheel speed signal, means for recalculating said error variable during each of successive time periods, means for calculating a difference variable equal to the difference between the error variables calculated in successive time periods, and means for recalculating said control signal in each of said successive time period as a function of the error variable and the difference variable.
Specification