Fuel injection device for internal combustion engines
US6067955A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1999 |
| Grant date | May 30, 2000 |
| Priority date | — |
| Expiry date | Jun 30, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M2200/703
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel injection device for internal combustion engines is proposed in which a fuel injection valve is controlled by the pressure in a pressure chamber, which acts on a pressure shoulder in its opening and closing direction. The pressure supply to the a pressure chamber is controlled by a control valve member which in turn is moved by a pressure in a working chamber. The pressure in the working chamber is controlled by a pre-control valve which has a closing body which, through the influence of the piezoelectric drive mechanism, is moved from a second valve seat to a first valve seat and thereby momentarily opens a relief line of the working chamber. This movement results in an opening of the control valve member and a supplying of high fuel pressure to the pressure chamber for purposes of injection. Thus a very small pre-injection quantity is produced. In order to produce a main injection quantity, the closing body is positioned in an intermediate position between the valve seats and a longer connection of the high-pressure fuel supply to the pressure chamber is consequently produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.