Four wheel drive vehicle with antilock brake device and associat

Details Four wheel drive vehicle with antilock brake device and associat Four wheel drive vehicle with antilock brake device and associat

1986-11-04

1988-08-23

McCall, James T.

Motor vehicles

Having four wheels driven

With means for braking either structure transmitting drive...

180233, 188 2R, B60K 17356, B60K 1734

Patent

active

047654333

ABSTRACT:
An antilock brake method and device for a four wheel drive vehicle having front and rear axles, left and right wheels on each axle with brakes associated with each wheel, a power unit drivingly connected to one of the axles, the other axle being coupled for drive together with the driven axle, a hydraulic braking system for controlling the hydraulic pressure applied to the brakes, and an antilock control system coupled to the braking system for controlling the hydraulic braking pressure to reduce the brake pressure when a wheel is about to be locked. The antilock control system includes a front wheel control section for controlling the brakes of the front wheels, a rear wheel control section for controlling the brakes of the rear wheels, and circuit elements included in the front and rear wheel control sections for keeping the hyraulic braking pressure reduced up to the completion of a braking operation, when any of the wheels is about to be locked. In a particular embodiment the rear wheel control section reduces the braking pressure in the rear wheel brakes and maintains the pressure reduced during a braking operation when any of the wheels is about to be locked.

REFERENCES:
patent: 3075405 (1963-01-01), Hill et al.
patent: 3081836 (1963-03-01), Hill
patent: 4254845 (1981-03-01), Braun
patent: 4466519 (1984-08-01), Romer
patent: 4626042 (1986-12-01), Burckhardt
patent: 4668023 (1987-05-01), Every

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