Anti-lock hydraulic brake system
US5195810A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1992 |
| Grant date | Mar 23, 1993 |
| Priority date | — |
| Expiry date | Feb 7, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S303/90
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An anti-lock hydraulic brake system is described having a bypass line to a pump used to evacuate and pressurize the wheel brakes during antilock control. A pressure control valve in the bypass line regulates the pressure in the pressure line to the master cylinder pressure level. A low pressure accumulator absorbs recirculated fluid flow from the bypass line. A pressure operated valve opens only when a difference in pressure between the master cylinder pressure and the pump outlet pressure line pressure develops. The consequence is that a non-return valve a and pressure operated valve in combination bring about isolation of the master cylinder during antilock control to prevent brake pedal reaction to pump pressure developed during a braking pressure control operation. When the accumulator is fully charged, the bypass line is closed by means of a shut-off valve operated by an accumulator piston so that the pump delivers fluid via the pressure valve (18) back into the master cylinder (1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.