Lost motion full authority valve actuation system
US6257183A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 1998 |
| Grant date | Jul 10, 2001 |
| Priority date | — |
| Expiry date | Nov 4, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L13/00
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A lost motion variable valve actuation system utilizing a single solenoid valve or trigger valve to vary the timing of the intake and exhaust valves for a cylinder of an internal combustion engine. The solenoid controls the oil supply to the tappets, which in turn, determine valve motion in response to a camshaft lobe The system allows independent control of each valve and provides for advanced features such as enhanced intake air swirl, two-valve or four-valve operation and staggered valve opening. The invention provides for valve operation even in the event of a total loss of system hydraulic pressure. The invention provides the practical benefits of a fully-variable system while preserving the security and reliability of a mechanical, cam-driven valve train. The invention provides for filling the exhaust and intake tappets independently without connecting their respective hydraulic circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.