Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1990-05-03
1991-03-19
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
188181R, 303100, 303110, 303103, B60T 832, B60T 858
Patent
active
050005243
ABSTRACT:
An electric motor-driven brake pressure modulator has an auxiliary field winding connected in series-parallel relationship with a permanent magnet field DC motor to produce different speed/torque performance characteristics depending on the direction of motor rotation. In forward motor rotation when the brake pressure is to be increased, the mmf of the auxiliary field winding aids the mmf of the field magnets to produce a higher flux density in the working air gap of the motor. This maximizes the torque characteristic of the motor for the development of adequate brake pressure. In the reverse direction of motor rotation when the brake pressure is to be decreased, the mmf of the auxiliary field winding opposes the mmf of the field magnets to lower the flux density in the working air gap of the motor. This maximizes the speed characteristic of the motor to quickly reduce the brake pressure.
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patent: 4653816 (1987-03-01), Lin
patent: 4755945 (1988-07-01), Kade et al.
patent: 4881784 (1989-11-01), Leppek
patent: 4917445 (1990-04-01), Leppek et al.
patent: 4926099 (1990-05-01), Ricker et al.
patent: 4927212 (1990-05-01), Harrison et al.
patent: 4957331 (1990-09-01), Burton et al.
Butler Douglas C.
General Motors Corporation
Navarre Mark A.
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