Fluid-pressure and analogous brake systems – Speed-controlled – Brake force or pressure determined from speed sensors
Patent
1997-05-09
1999-07-27
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Brake force or pressure determined from speed sensors
303DIG4, 303 10, 303 11, 3031161, B60T 842
Patent
active
059278323
ABSTRACT:
A brake system control apparatus comprising: a fluid brake system including a master cylinder containing a hydraulic fluid having a hydraulic pressure, a hydraulic pump having an output hydraulically coupled to the master cylinder, a motor coupled to and providing motive force to the hydraulic pump, a current sensing device coupled to the motor and providing an output signal indicative of electric current through the motor; and an electronic controller coupled to the current sensing device comprising a first sampler taking a first sample of the output signal a first time period after a start up of the motor, a second sampler taking a second sample of the output current a second time period after start up of the motor and a divider for determining a ratio of the first and second samples wherein the ratio is indicative of a hydraulic pressure in the master cylinder at the start up of the motor.
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Borchers William Frank
Cornwell William Dale
Fulks Gary Chris
Butler Douglas C.
General Motors Corporation
Sigler Robert M.
Simon Anthony L.
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