Driving wheel control system for automotive vehicles

Details Driving wheel control system for automotive vehicles Driving wheel control system for automotive vehicles

1991-03-20

1992-12-15

Marmor, Charles A.

Motor vehicles

With means for detecting wheel slip during vehicle...

123399, 36442601, B60K 2816

Patent

active

051708604

ABSTRACT:
A control system for controlling driving wheels of an automotive vehicle in which when at least one of the driving wheels undergoes excessive slip, an ECU drives a pulse motor to bring a throttle valve of an internal combustion engine installed in the vehicle toward a closed position thereof to thereby suppress the excessive slip. When a state that a detected value of throttle valve opening is smaller than a detected value of accelerator pedal angle while the pulse motor is in stoppage has continued over a predetermined period of time, the ECU determines the initial position of the pulse motor by storing the detected throttle valve opening value as a reference value of the pulse motor position. If the initial pulse motor position has not been determined when a second predetermined period of time has elapsed after the pulse motor started to be driven to bring the throttle valve toward its fully closed position, a throttle system of the engine is determined to be abnormal, and then the pulse motor is forcedly driven to bring the throttle valve into its fully open position. After completion of pulse motor control for suppression of the excessive slip, the ECU carries out open loop control for driving the pulse motor to bring the throttle valve into a substantially fully open position irrespective of whether or not the initial position of the pulse motor has been determined.

REFERENCES:
patent: 4581924 (1986-04-01), Otobe et al.
patent: 4856477 (1989-08-01), Hanaoka et al.
patent: 4941444 (1990-07-01), Fujita
patent: 5033431 (1991-07-01), Poirier et al.

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