Fuel injection system for an internal combustion engine
US5036821A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 1989 |
| Grant date | Aug 6, 1991 |
| Priority date | — |
| Expiry date | Nov 7, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/2096
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel injection system for an internal combustion engine, wherein a spill valve device operated by a piezoelectric unit is provided for carrying out a pressure pump spill operation when a fuel injection stroke is completed. The spill valve device includes a operating chamber connected to a sealed chamber of the piezoelectric unit, the sealed chamber being connected to a fuel supplementing passageway which is connected to a fuel passageway connecting a fuel tank with a fuel intake port of the pressure pump. The pressure pump is further provided with a spill passageway for discharging pressurized fuel in the pressure chamber via the fuel passageway. A check valve is provided in the fuel passageway to prevent a flow of the spilled fuel to the sealed chamber of the piezoelectric unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.