Rear-axle demand for use with front push-through in electrohydraulic (EHB) braking systems
US6824228B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 2003 |
| Grant date | Nov 30, 2004 |
| Priority date | — |
| Expiry date | Apr 10, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S303/03
- WIPO fieldTransport
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.