Anti-locking vehicle brake system for individual wheel control

Claim 2

A fluid pressure actuated anti-skid brake control system for a vehicle having a pair of brake equipped wheels that are independently rotatable on a common axle of the vehicle, said system comprising: a. signal generator means for providing a plurality of wheel behavior signals according to the dynamic conditions of each respective wheel of said axle; b. valve means at each wheel for modulating the brake pressure thereat; and c. evaluation circuit means subject to said wheel behavior signals of the respective wheels for controlling said valve means, said evaluation circuit means being arranged so that when one of said wheel behavior signals of either one of said wheels is shifted in time relative to the corresponding one of said wheel behavior signals of the other of said wheels, the brake pressure of the faster rotating wheel is influenced, by said at least one of said wheel behavior signals of the slower rotating wheel, in such sense as to be held constant.

Claim 3

The system as recited in claim 1, further characterized in that said at least one of said wheel behavior signals is a deceleration signal generated when the rate of deceleration of said slower running wheel exceeds a predetermined threshold.

Claim 4

The system as recited in claim 2, further characterized in that said valve means of said slower running wheel effects a reduction of brake pressure therefrom in response to said deceleration signal.

Claim 5

The system as recited in claim 1, further characterized in that said at least one of said wheel behavior signals is an acceleration signal generated when the rate of acceleration of said slower running wheel exceeds a predetermined threshold.

Claim 6

The system as recited in claim 4, further characterized in that the brake pressure of each of said wheels is reapplied simultaneously upon disappearance of said acceleration signal from said slower running wheel.

Claim 7

The system as recited in claim 1, wherein: a. said valve means comprises: i. supply valve means for interrupting the supply of fluid brake pressure when actuated from a normal position in which said supply of brake pressure is provided; and ii. release valve means for exhausting fluid brake pressure when actuated from a normal position in which the exhaust of brake pressure is interrupted; b. said wheel behavior signals including a deceleration signal generated when a respective one of said wheels exceeds a predetermined deceleration threshold and an acceleration signal when a respective one of said wheels exceeds a predetermined acceleration threshold, and c. said evaluation circuit means includes means subject to said deceleration and acceleration signals from each of said wheels in response to any one of which is provided a first output signal for actuating said supply valve means of each of said wheels, said exhaust valve means of each respective wheel being actuated in response to said deceleration signal thereof.

Claim 8

The system as recited in claim 6, wherein said evaluation circuit means further comprises: a. pulse generator means that produces a second output signal in parallel with said first output signal for periodically effecting actuation of said supply valve means of each of said wheels; and b. disabling means subject to said wheel behavior signals of each of said wheels for interrupting said first output signal only in the absence of each of said wheel behavior signals.

Claim 9

The system as recited in claim 7, further characterized in that said disabling means effects interruption of said first output signal and simultaneously initiates operation of said pulse generator means.