Fuel injector
US6264116A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1999 |
| Grant date | Jul 24, 2001 |
| Priority date | — |
| Expiry date | Sep 14, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M57/023
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel injector comprising a valve needle biased by a spring into engagement with a seating, a surface associated with the valve needle being exposed to fuel pressure within a control chamber and restricted communication structure providing a restricted flow path between a supply passage and the control chamber. The fuel injector further comprises a drain valve controlling communication between the supply passage and a low pressure reservoir and an injection control valve controlling communication between the control chamber and the low pressure reservoir, the drain valve and the injection control valve being moveable under the control of a single electromagnetic actuator including an armature common to both valves. The injection control valve, the drain valve and the actuator are arranged such that at rest, the injection control valve and the drain valve are open, when the actuator is energized to a first, relatively low energization level the drain valve is closed and the injection control valve is open, and when the actuator is energized to a second, higher energization level, the drain valve and the injection control valve are both closed. A method of operating a fuel injector …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.