Patent ID: 6824228
Filing Date: 2004-11-30
Classification: B60T,Y10S

Abstract:
An electro-hydraulic braking system of the type which operates normally in a brake-by-wire mode wherein hydraulic pressure is applied to braking devices at the vehicle wheels in proportion to the driver's braking demand as sensed electronically at a brake pedal, and which, if the brake-by-wire mode should fail, at least as far as the front brakes are concerned, operates in a push-through mode wherein hydraulic pressures are applied to the braking devices at the front wheels of the vehicle by way of a tandem master cylinder coupled mechanically to the brake pedal, wherein, in the situation where push-through operation has been selected at the front brakes, but the rear brakes are continuing to be operated under EHB, a rear brake demand is established using a combination of individually measured pressure of the front brake actuators and of the master cylinder.