Anti-lock hydraulic brake system with plunger system and pump
US4753491A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 28, 1987 |
| Grant date | Jun 28, 1988 |
| Priority date | — |
| Expiry date | Jan 28, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T8/4233
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An anti-lock hydraulic brake system equipped with one plunger system (7, 8) each per brake circuit (I, II) for the purpose of pressure control, that is, slip control. Serving as an auxiliary-pressure source is a hydraulic pump (9) which is driven electromotively, preferably through the starter motor (10), and which comprises hydraulically isolated circuits for the individual plunger systems. The plunger systems are each controlled by one two-way/two-position directional control valve (21, 22) which is actuatable electromagnetically and is controllable as a function of the signals obtained by wheel sensors (24 to 27) and processed in an electronic controller (23). A valve piston (47, 48) in conjunction with a valve member (55, 56) and a channel (53, 54) closable by this valve member opens in the plunger system (7, 8) a connection to a pressure-fluid return line (19, 20) as soon as the braking pressure has decreased to a predetermined low threshold value and thereby prevents low pressure in the brake system. The hydraulic pump (9) is in operation only during the control. A strong resetting spring (45, 46) ensures that the normal brake function will be regained immediately on failure …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.