Hydraulically-actuated fuel injector with electronically actuated spill valve
US6173699A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 4, 1999 |
| Grant date | Jan 16, 2001 |
| Priority date | — |
| Expiry date | Feb 4, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M59/366
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A hydraulically actuated fuel injector includes an injector body that defines an actuation fluid cavity and a nozzle outlet, and further defines a low pressure area and a fuel pressurization chamber in fluid communication with a spill passage. A pumping element is positioned in the injector body and moveable between a retracted position and an advanced position. The pumping element has a first end exposed to fluid pressure in the actuation fluid cavity and a second end exposed to fluid pressure in the fuel pressurization chamber. An electronic spill valve attached to the injector body is moveable between an open position in which the spill passage fluidly connects the fuel pressurization chamber to the low pressure area, and a closed position in which the spill passage is closed. Opening and closing of the spill valve during an injection event produces various rate shaping injection effects.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.