Wheel slip control system for automotive vehicles and the like

Details Wheel slip control system for automotive vehicles and the like Wheel slip control system for automotive vehicles and the like

1975-02-03

1976-04-20

Blix, Trygve M.

Fluid-pressure and analogous brake systems

Inertia control

303 20, 303 21AF, 340 53, B60T 808

Patent

active

039514676

ABSTRACT:
A control system for adjusting the pressure applied to fluid-controlled brake actuating mechanisms in response to predetermined variations in wheel speed and rate of change of wheel speed brought about by the application of fluid pressure to the wheel brake actuating mechanisms. Signals proportional to the angular velocity and rate of change of angular velocity of a selected wheel are employed to control the sequence and duration of the energization and de-energization of the solenoid valves in a modulator valve assembly. The incremental decrease in wheel velocity from the time said deceleration threshold is reached, at which time a gradual adjustment of brake line fluid pressure is effected, is monitored to determine when a continuously-variable reference increment of wheel speed .DELTA. v has been exceeded, at which time a sharp reduction in brake line fluid pressure is effected. This continuously-variable reference increment .DELTA.v is defined in each cycle by (1) the value of wheel velocity at the time said deceleration threshold is reached and (2) a variable reference signal which is related to both wheel speed and deceleration during periods of deceleration of the monitored wheel, and is related only to acceleration during periods of acceleration of the monitored wheel.

REFERENCES:
patent: 3578819 (1971-05-01), Atkins
patent: 3640588 (1972-02-01), Carp et al.
patent: 3804470 (1974-04-01), Slavin et al.

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