Fast start hydraulic system for electrohydraulic valvetrain
US5410994A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 27, 1994 |
| Grant date | May 2, 1995 |
| Priority date | — |
| Expiry date | Jun 27, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L2001/34446
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A hydraulic system for controlling an engine valvetrain wherein each of the reciprocating intake and/or exhaust valves is hydraulically controlled and selectively connected to a source of high pressure fluid and a source of low pressure fluid. The hydraulic system maintains fluid pressure both when the engine is running, by employing a pump and an auxiliary pump, and when engine is off, by employing an accumulator and by selectively employing an auxiliary pump controlled by an engine control system. By maintaining pressure in the hydraulic system, the engine valves begin operating immediately upon start-up of the engine even after it has been left idle for an extended period of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.