Anti-lock brake control system for motor vehicle and brake force control method therefor
First Claim
1. An anti-lock brake control system for a motor vehicle for applying brake to said motor vehicle in safety while avoiding occurrence of a wheel-locked state by repeating operation for lowering a braking hydraulic pressure when a wheel speed decreases upon braking to a level at which said wheel-locked state is likely to occur and increasing again said braking hydraulic pressure when the wheel speed is recovered as a result of said lowering of the braking hydraulic pressure, comprising:
- wheel speed detecting means for detecting a rotation speed of each of the wheels of said motor vehicle;
wheel acceleration arithmetic means for arithmetically determining acceleration of the wheel on the basis of the wheel speed obtained by said wheel speed detecting means;
torsion torque detecting means for detecting a torsion torque applied to a driving shaft for operatively connecting each of said wheels to driving means;
corrected acceleration arithmetic means for arithmetically determining a corrected acceleration by correcting the wheel acceleration obtained from said wheel acceleration arithmetic means with the torsion torque obtained by said torsion torque detecting means;
control command means for issuing a command for changing a brake force increasing slope in dependence on status of said wheel acceleration indicating behavior of the wheel and status of said corrected acceleration indicating influence of the torsion torque, respectively; and
brake force regulating means for controlling the brake force in accordance with said command.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus for preventing a brake force from increasing in excess upon starting of an anti-lock brake control for enhancing initial brake performance of an anti-lock brake control system. Rotation speed of each of wheels is detected, and wheel acceleration is determined. Further, a corrected acceleration is determined by correcting the wheel acceleration with a torsion torque detected from a driving shaft. In dependence on the statuses of the wheel acceleration and the corrected acceleration, a rate at which the brake force is increased is modified. Enhanced brake performance in the initial control phase can be ensured when the motor vehicle is running on a road exhibiting high friction coefficient while stability of the motor vehicle running on a road of low friction can be realized. Besides, even when difference frictions act on left and right wheels, the motor vehicle is protected against yawing moment.
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Citations
6 Claims
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1. An anti-lock brake control system for a motor vehicle for applying brake to said motor vehicle in safety while avoiding occurrence of a wheel-locked state by repeating operation for lowering a braking hydraulic pressure when a wheel speed decreases upon braking to a level at which said wheel-locked state is likely to occur and increasing again said braking hydraulic pressure when the wheel speed is recovered as a result of said lowering of the braking hydraulic pressure, comprising:
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wheel speed detecting means for detecting a rotation speed of each of the wheels of said motor vehicle; wheel acceleration arithmetic means for arithmetically determining acceleration of the wheel on the basis of the wheel speed obtained by said wheel speed detecting means; torsion torque detecting means for detecting a torsion torque applied to a driving shaft for operatively connecting each of said wheels to driving means; corrected acceleration arithmetic means for arithmetically determining a corrected acceleration by correcting the wheel acceleration obtained from said wheel acceleration arithmetic means with the torsion torque obtained by said torsion torque detecting means; control command means for issuing a command for changing a brake force increasing slope in dependence on status of said wheel acceleration indicating behavior of the wheel and status of said corrected acceleration indicating influence of the torsion torque, respectively; and brake force regulating means for controlling the brake force in accordance with said command. - View Dependent Claims (2, 3, 4, 5)
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6. A method of controlling a brake force in an anti-lock brake control system for a motor vehicle for applying brake to said motor vehicle in safety while avoiding occurrence of a wheel-locked state by repeating operation for lowering a braking hydraulic pressure when a wheel speed decreases upon braking to a level at which said wheel-locked state is likely to occur and increasing again said braking hydraulic pressure when the wheel speed is recovered as a result of said lowering of the braking hydraulic pressure, comprising the steps of:
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detecting a rotation speed of each of the wheels of said motor vehicle; arithmetically determining acceleration of the wheel on the basis of the detected wheel speed; detecting a torsion torque applied to a driving shaft operatively connecting each of said wheels to driving means; arithmetically determining a corrected acceleration by correcting said wheel acceleration with said torsion torque; issuing a command for changing a brake force increasing slope in dependence on status of said wheel acceleration and status of said corrected acceleration indicating influence of the torsion torque, respectively; and controlling the brake force in accordance with said command.
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Specification