Fluid-pressure and analogous brake systems – Speed-controlled – And traction control
Reexamination Certificate
1999-09-07
2001-12-04
Oberleitner, Robert J. (Department: 3613)
Fluid-pressure and analogous brake systems
Speed-controlled
And traction control
C303S146000
Reexamination Certificate
active
06325469
ABSTRACT:
This invention relates to a brake control system and method.
BACKGROUND OF THE INVENTION
Automotive vehicles have been produced or demonstrated with brake systems that modulate brake force during stops to provide anti-lock brake control (ABS) and/or that modulate brake force during vehicle acceleration to provide positive acceleration traction control (TCS). Some such brake systems additionally provide brake-by-wire control.
SUMMARY OF THE PRESENT INVENTION
It is an object of this invention to provide a brake control method according to claim
1
.
Advantageously this invention provides a brake control system for actively controlling the brakes of a motor vehicle.
Advantageously this invention provides a brake control system achieving closed loop yaw control by developing a yaw rate command from operator inputs such as vehicle speed and steering wheel position. This invention provides a control that minimizes a difference between the yaw rate command and the actual vehicle yaw rate.
Advantageously, this invention provides a brake control system suitable for use on vehicles with anti-lock brake control and positive acceleration traction control. Advantageously, this invention provides a brake control system to reduce yaw rate error of the vehicle that works with anti-lock brake control and positive acceleration traction control when such systems are active and independently when such systems are not active.
Advantageously, this invention provides yaw rate control during operation of anti-lock braking and/or positive acceleration traction control to achieve the benefits of the yaw rate control along with those of the anti-lock braking and positive acceleration traction control.
Advantageously, according to a preferred example, this invention provides a brake system control for use in a vehicle with four wheels according to the steps of: determining a desired yaw rate; determining a yaw torque command responsive to the desired yaw rate; if the vehicle is in an anti-lock braking mode during driver commanded braking, applying the yaw torque command to only one of the four wheels to release brake pressure in said one of the four wheels; if the vehicle is in a positive acceleration traction control mode during driver commanded acceleration, applying the yaw torque command to only one of the four wheels to apply brake pressure in said one of the four wheels; and if the vehicle is not in the anti-lock braking mode or in the positive acceleration traction control mode, then: (i) determining whether a vehicle brake pedal is depressed; (ii) if the vehicle brake pedal is depressed, applying brake force to the vehicle wheels responsive to the depression of the brake pedal, wherein the applied brake force is modified to at least two of the vehicle wheels to create a left-right brake torque differential responsive to the torque command.
Advantageously, according to another example, this invention provides a brake system control for use in a vehicle with positive acceleration traction control in which a difference between a driven wheel speed and a vehicle speed is controlled to a target value, the brake system control comprising the steps of: determining a desired yaw rate; measuring an actual yaw rate; responsive to the desired yaw rate and the actual yaw rate, adaptively adjusting the target value within a predetermined range, wherein a difference between the actual yaw rate and the desired yaw rate is minimized when the positive acceleration traction control is activated.
Advantageously, according to another example, this invention provides a brake system control for use in a vehicle with an anti-lock brake system in which brake pressure to front and rear vehicle wheels is modulated to prevent wheel lock-up conditions, the brake system control comprising the steps of: determining a desired vehicle yaw rate; measuring an actual vehicle yaw rate; determining responsive to the desired vehicle yaw rate and the actual vehicle yaw rate whether the vehicle is in a state of oversteer; and if the vehicle is in a state of oversteer and if the anti-lock brake control is active, reducing an average brake force applied to the rear brakes by the anti-lock brake control to reduce a difference between the desired vehicle yaw rate and the actual vehicle yaw rate.
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See also co-pending applications: 09/134,951, 09/139,072, 09/136,947, 09/138,685, 09/138,737, 09/138,335, 09/134,954, 09/195,674, 09/138,335, 09/230,824.
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Bassett Duane E
Carson Douglass L
Chen Hsien H
Chin Yuen-Kwok
Ghoneim Youssef A
General Motors Corporation
Oberleitner Robert J.
Siconolfi Robert A.
Simon Anthony Luke
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