Active brake balance control method

Details Active brake balance control method Active brake balance control method

1998-11-09

2001-01-30

Schwartz, Christopher P. (Department: 3613)

Fluid-pressure and analogous brake systems

Speed-controlled

With yaw control

C701S038000

Reexamination Certificate

active

06179394

ABSTRACT:

TECHNICAL FIELD
This invention relates to a motor vehicle active brake control (ABC) method.
BACKGROUND OF THE INVENTION
Active brake controls (ABC) have been used to improve vehicle handling under conditions of non-linear wheel operation (i.e., lateral wheel movement relative to a road surface) by applying differential braking forces to left and right wheels of the vehicle with the objective of bringing the vehicle yaw rate and/or slip angle into conformance with desired values provided by a linear reference model. See, for example, the U.S. Pat. No. 5,720,533 to Pastor et al., issued on Feb. 24, 1998, assigned to the assignee of the present invention, and incorporated herein by reference.
SUMMARY OF THE INVENTION
The present invention is directed to an improved control method that utilizes active braking of the front wheels of a vehicle to provide vehicle balance control during conditions of carriage motion tendency relative to the longitudinal vehicle axis. Accordingly, the control may be integrated with known active brake controls that regulate yaw rate and/or slip angle, or traction controls that regulate front wheel slippage, thereby significantly improving the functionality of the respective control for little or no additional cost.
According to the invention, a measure of carriage motion tendency of a revolving type relative to the longitudinal axis (hereinafter “carriage motion tendency”) is determined by computing a control parameter based on the roll angle of the vehicle and the rate of change of roll angle. If the computed control parameter exceeds an enable threshold, a condition of carriage motion tendency is detected and the brake control actuators are activated to reduce the velocity of the front wheels of the vehicle by a delta velocity command determined as a function of the roll angle and roll angle rate, so as to saturate the lateral adhesion capability of the front tires. When the computed control parameter falls below a disable threshold, the delta velocity command is gradually decayed to exit the control.


REFERENCES:
patent: 5869943 (1999-02-01), Nakashima
patent: 5913578 (1999-06-01), Tozu
patent: 6052641 (2000-04-01), Wuerth

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