Motor driven brake pressure modulator with motor position contro

Details Motor driven brake pressure modulator with motor position contro Motor driven brake pressure modulator with motor position contro

1992-08-10

1994-06-14

Oberleitner, Robert J.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

3031152, B60T 858

Patent

active

053204212

ABSTRACT:
A multi-phased electrically commutated brushless DC motor driven brake pressure modulator includes a pressure actuator the position of which is controlled by the motor to establish the desired brake pressure. The movement of the actuator is determined by monitoring the motor rotation as represented by the output of the rotor position sensors used in commutation of the motor windings. The position of the actuator is represented by a counter value which is incremented or decremented in response to the output of the rotor position sensors and the direction of motor rotation. The counter value is related to the actuator position by presetting the counter value when the actuator in a known position such as a mechanical limit position. The known position is established by causing the motor to rotate in a direction to position the actuator toward the limit position until further outputs of the rotor position sensor are not sensed indicating the actuator is at its mechanical limit position.

REFERENCES:
patent: 4289358 (1981-09-01), Dufft et al.
patent: 4665350 (1987-05-01), Angi et al.
patent: 4822114 (1989-04-01), Klein
patent: 4869557 (1989-09-01), Gerum et al.
patent: 4909577 (1990-03-01), Harrison et al.
patent: 4926099 (1990-05-01), Ricker et al.
patent: 4941553 (1990-07-01), Harrison
patent: 4986614 (1991-01-01), Ricker et al.

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