Process for actuating a motor vehicle retarding brake controlled by an electrohydraulic valve system
US4867288A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1988 |
| Grant date | Sep 19, 1989 |
| Priority date | — |
| Expiry date | Apr 28, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/66
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
The invention relates to a process for the actuation of an hydrodynamic retarder brake for motor vehicles, which is controlled by an electrohydraulic valve system. The rotational velocity of some part of the drive system (or an average of a plurality thereof) is indicated by a continuously generated electrical signal. When the throttle is released, or the brake pedal, having been depressed is then released, the vehicle velocity at that moment is stored as a reference signal in a memory. If the actual velocity thereafter exceeds the stored value, the hydrodynamic retarder is actuated. The momentary velocity of the vehicle is thereafter continuously compared with the stored reference velocity, and the retarder controlled accordingly. Rapidly applied retarder action is realized by controlling the same using PD control.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.