Brake control system having an electro-pneumatic pilot valve
US4094553A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1977 |
| Grant date | Jun 13, 1978 |
| Priority date | — |
| Expiry date | Jul 28, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/74
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An electro-pneumatic pilot valve device is operably connected to a relay valve device for governing fluid pressure control of friction brakes of a vehicle in accordance with at least one variable analog signal input to the pilot valve device. The electro-pneumatic pilot valve device has a differential piston assembly comprising a valve plunger having ball valves disposed coaxially thereon and input, vent, and pilot chambers associated with the valves wherein one of the valves selectively connects the input chamber to the pilot chamber, and another valve selectively connects the pilot chamber to the vent chamber. A linear torque motor is governed by a variable input electrical signal for selectively applying a force axially to the plunger to vent fluid from the pilot chamber to atmosphere through the vent chamber. A balance of forces acting on the plunger permits operation of the valves to a lap position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.