Fuel injector
US6877679B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jan 26, 2001 |
| Grant date | Apr 12, 2005 |
| Priority date | — |
| Expiry date | Jun 3, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8242
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A conventional fuel injection system meters fuel by varying the time for which the injector is open. This is an empirical rather than fundamental method of metering the fuel. The amount of fuel delivered for a given injector opening time will depend on the pressure difference across the injector orifice and the exact dimensions of the injector orifice. Both these parameters are subject to variation. An injector (1) which comprises a plunger (2), a solenoid coil (3), and a conical return spring (11) which is driving a primary high pressure pump assembly consisting of a primary piston (4) within a primary cylinder (5) together with primary inlet valve (8) and primary outlet valve (7). The plunger (2) is also driving a secondary low pressure pump assembly consisting of a secondary piston (22), secondary cylinder (23), secondary inlet valve (24) and secondary outlet valve (25). The solenoid coil (3) is under the control of an electronic monitor unit (10) which is connected to the solenoid coil (3) via two connecting wires (19). The injector is mounted in and is delivering fuel into an inlet manifold (20). By interrogating various sensors around the engine the electronic monitor unit (1…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.