Fuel injection system for air-compressing internal combustion engines
US5195487A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1991 |
| Grant date | Mar 23, 1993 |
| Priority date | — |
| Expiry date | Dec 10, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B3/06
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to an injection system for air-compressing combustion engines. In order to reduce the combustion noise of diesel combustion engines it has been suggested to divide the injection step into a pre-injection and main injection. In order to improve the velocity of the injection quantity increase during partial load and/or at low revolutions per minute it is suggested that a pressure wave generator is arranged downstream of the injection pump and to further provide a volume reservoir in parallel to the pressure wave generator. The pressure wave generator ensures that the passage of the injection line is opened only when a predetermined pressure has been reached. After opening of the pressure wave generator the pressure will not drop as quickly since fuel will be supplied by the volume reservoir even when the injection pump has only a low piston velocity. A further advantage of the present invention is that the by-pass line may branch off at a metering piston unit so that due to the reflection of the pressure wave at the metering piston, generated by the pressure wave generator, a doubling of the pressure occurs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.