Rear-axle demand for use with front push-through in electrohydraulic (EHB) braking systems
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United States of America Patent
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-
Nov 30, 2004
Issued Date -
N/A
app pub date -
Apr 10, 2003
filing date -
Oct 14, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
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 calculated as a 'multiple average' from the expression: [P2+(P1+P3)/2]/2 where P1 and P3 are signals from the master cylinder and a front brake sensor in the same push-through circuit and P2 is a signal from the front brake sensor in the other circuit.
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