Fluid-pressure and analogous brake systems – Speed-controlled – Torque sensing
Patent
1993-03-04
1995-02-21
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Torque sensing
318376, B60T 1374
Patent
active
053909925
ABSTRACT:
An electric braking system controls the vehicle brake torque based on the pressure applied by the vehicle operator to the vehicle brake pedal and a moving vehicle brake system gain to provide normal power assisted braking while the vehicle is moving. The deviation of the vehicle braking condition from a level incline and lowest vehicle weight (LVW) is determined based upon a determined percent difference between the actual vehicle deceleration while the vehicle is being braked to a stop and an expected deceleration that would result from the total brake torque, a level road surface, and the vehicle weight at LVW. The expected deceleration is determined by determining the total vehicle brake torque represented by the sum of the brake torques applied by the individual wheel brakes and dividing by the LVW of the vehicle. The target torque required to hold the vehicle when stationary is then determined by adjusting a minimum torque value, corresponding to a level road surface and the vehicle weight at LVW, based upon the percent difference in the deceleration values. Finally, a static gain of the electric braking system is determined by dividing the required torque by the operator applied pedal pressure. When the vehicle comes to a rest, the brake system gain is adjusted to the static gain to establish the brake torque at the lowest level required to hold the vehicle stationary on the road surface to thereby minimize static braking actuator current.
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Leppek Kevin G.
Walenty Allen J.
Conkey Howard N.
General Motors Corporation
Graham Matthew C.
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