Fuel injection device for internal combustion engines, in particular unit fuel injection
US4976244A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 20, 1989 |
| Grant date | Dec 11, 1990 |
| Priority date | — |
| Expiry date | Oct 20, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel injection device for internal combustion engines including a pump nozzle, a pump piston, preferably driven via a drive cam, and a pressure chamber disconnected from a pump chamber by an intermediate piston that preferably assumes its end postions in its working stroke, with a pressure line leading from the pressure chamber to an injection nozzle. The control of fuel quantity into the pressure chamber is effected via a control valve, preferably embodied as a magnetic valve, in a feed line that is also controlled by a control slide driven in synchronism with the pump piston. During one intake stroke segment of the pump piston, the feed line is connected to the pressure chamber; during another intake stroke segment, the feed pump is connected to a reservoir, so as to control the fill volume of the reservoir as a function of time. During the first compression stroke segment fuel is positively displaced from the pump chamber to the reservoir and once it is refilled with a variable fill quantity, the supply onset can be initiated by suitably driving the intermediate piston.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.