Fuel injection apparatus for an internal combustion engine
US6779741B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 8, 2002 |
| Grant date | Aug 24, 2004 |
| Priority date | — |
| Expiry date | Feb 18, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M59/366
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
For each cylinder of the internal combustion engine, the fuel injection apparatus has a high-pressure fuel pump and a fuel injection valve connected to it. A pump piston of the high-pressure fuel pump defines a pump working chamber, which is connected to a pressure chamber of the fuel injection valve, which has an injection valve member, which controls the injection openings and which the pressure prevailing in the pressure chamber can move in an opening direction, counter to a closing force. A first control valve controls a connection between the pump working chamber and a relief chamber, and a second control valve controls a connection between a relief chamber and a control pressure chamber connected to the pump working chamber. A control piston, which is connected to the injection valve member, divides the control pressure chamber into two separate partial chambers, which are connected to each other by means of a throttle restriction. When the second control valve is closed, a lower force acts on the control piston in a closing direction of the injection valve member than when the second control valve is open.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.