Antilock brake system with motor current control

Details Antilock brake system with motor current control Antilock brake system with motor current control

1990-07-26

1991-12-10

Graham, Matthew C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303DIG4, B60T 858

Patent

active

050711997

ABSTRACT:
The motor current in a vehicle antilock brake system motor driven pressure modulator is increased in stepwise fashion to ramp the brake pressure in the apply phase of an antilock braking cycle. At the beginning of each current step as the motor current is increased in stepwise fashion, the motor torque is increased momentarily at least by an amount to assure that the static friction of the pressure modulator is overcome and that motor rotation is initiated. The motor torque is increased to a value to initiate motor rotation at the beginning of each current step by momentarily increasing the motor current to a value greater than the current step value by a predetermined amount that assures that the increase of motor torque exceeds the static friction of the pressure modulator.

REFERENCES:
patent: 4750124 (1988-06-01), Lin et al.
patent: 4755946 (1988-07-01), Lin
patent: 4807134 (1989-02-01), Agarwal et al.
patent: 4941553 (1990-07-01), Harrison

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