Isolation valve bypass for master cylinder brake fluid in wheel lock control system
US4859001A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1987 |
| Grant date | Aug 22, 1989 |
| Priority date | — |
| Expiry date | Dec 28, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T8/94
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A vehicle wheel brake system having a service braking section and a wheel lock control (ABS) section is provided. Under certain conditions the wheel lock control section may not be able to generate sufficient pressure to operate the vehicle wheel brakes when the master cylinder output pressure has been isolated from the wheel brakes. When such conditions occur, the displacement piston of the ABS control section moves to open a bypass valve which connects master cylinder output pressure to the vehicle wheel brake even though the ABS system has isolated it from that wheel brake. The opening of the bypass valve effectively returns the vehicle braking system to service braking until the vehicle operator releases the brake system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.