Fuel injection device for an internal combustion engine
US6981653B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 5, 2002 |
| Grant date | Jan 3, 2006 |
| Priority date | — |
| Expiry date | Dec 5, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M45/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel injection system having a high-pressure fuel pump connected to a fuel injection valve for each cylinder of an internal combustion engine in which the high-pressure fuel pump has a piston defining a working chamber communicating with a pressure chamber of the fuel injection valve, which has an injection valve element that controls injection openings and can be moved in an opening direction counter to a closing force by the pressure prevailing in the pressure chamber. A first control valve controls a connection of the pump working chamber to a relief chamber and a second control valve controls a connection of a control pressure chamber, which communicates with the pump working chamber, to a relief chamber. When a control piston acts on the injection valve element, in a stroke position of the control piston in which the injection valve element is in its closed position, the pressure prevailing in the control pressure chamber acts on a greater end surface of the control piston than in a stroke position of the control piston in which the injection valve element is opened by its maximal stroke.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.