Valve deactivation and adjustment system for electrohydraulic camless valvetrain
US5373817A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1993 |
| Grant date | Dec 20, 1994 |
| Priority date | — |
| Expiry date | Dec 17, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L1/26
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A electrohydraulic engine valve control system in a four valve per cylinder engine wherein each of pair of intake and/or exhaust valves in each cylinder is hydraulically controlled by a separate set of solenoid valves. Each engine valve includes a piston subjected to fluid pressure acting on surfaces at both ends with the volume at one end connected to a source of high pressure fluid while a volume at the other end is selectively connected to a source of high pressure fluid and a source of low pressure fluid, and disconnected from each through action of the solenoid valves. Each pair of corresponding valves is linked hydraulically together and my be moved in unison or one may have reduced travel relative to the other via a valve deactivator, including one valve being completely deactivated. This difference in travel between the pair of valves accounts for various engine operating conditions and manufacturing tolerances. Equal air delivery to all engine cylinders having the aforementioned variable valve control system is assured by controlling electric pulses of variable duration and timing along with actuation of the valve deactivator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.