Wheel slip control system adapted to use on low coefficient surf

Details Wheel slip control system adapted to use on low coefficient surf Wheel slip control system adapted to use on low coefficient surf

1976-07-15

1977-07-19

Blix, Trygve M.

Fluid-pressure and analogous brake systems

Pipeless valves

303 97, 303105, B60T 802

Patent

active

040365360

ABSTRACT:
A wheel slip control system generates one level of brake relief when a fixed threshold of wheel deceleration is exceeded. The system generates a second level of brake relief when a variable threshold, dependent upon both deceleration and velocity, is exceeded. A fixed acceleration threshold circuit monitors wheel acceleration during brake relief. Under normal road and load conditions, where wheel acceleration is great enough to exceed the fixed acceleration threshold, termination of brake relief is initiated by the increase in wheel velocity past a variable reference threshold which has a fixed part and a variable part. The fixed part is an a priori prediction of the minimum vehicle velocity decrease under normal stopping conditions. The variable part is dependent on wheel acceleration alone. When the acceleration threshold is not exceeded, as with slippery roads or very light loads, termination of brake relief is delayed until wheel acceleration decreases to a low value. This allows the wheel velocity to come up to approximately full vehicle speed before allowing brake re-application. A brief re-energization of the first level of brake relief, performed after a brief delay, reduces the tendency of the vehicle wheels to hop and bounce.

REFERENCES:
patent: 3790227 (1974-02-01), Dozier
patent: 3951467 (1976-04-01), Fleagle

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