Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1992-08-19
1993-12-28
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
36442602, B60T 858
Patent
active
052733491
ABSTRACT:
During the apply phase of an ABS pressure cycle in a system having a motor driven pressure modulator, the motor current is controlled to an apply bump motor current value during the initial period of the apply phase for a wheel parameter dependent duration to quickly recover brake pressure after which an initial apply current is established in the motor from which value the current is ramped to ramp brake pressure. The duration of the apply bump current is monitored and when the duration exceeds a minimum value, representing the time required for the apply bump current to reverse the motor direction from pressure release to pressure apply and to establish the motor speed at a steady state condition whereat the motor current is a reliable measurement of the applied brake pressure, the actual motor current at the end of the apply bump is used as the initial apply current.
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Conkey Howard N.
General Motors Corporation
Graham Matthew C.
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