Closed nozzle fuel injector with improved controllabilty
US6499467B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 2000 |
| Grant date | Dec 31, 2002 |
| Priority date | — |
| Expiry date | Mar 31, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M2200/21
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A novel and improved closed nozzle injector is provided which effectively and accurately controls the timing and rate of fuel injection while minimizing parasitic losses and needle valve element wear. The closed nozzle injector includes a needle valve element movable between open and closed positions, an outer control volume, an injection control valve for controlling the flow of pressurized fuel from the outer control volume to affect opening and closing of the needle valve element and a needle valve biasing feature for optimizing the speed of needle valve opening and closing. The needle valve biasing feature includes an inner guide portion formed on the needle valve element with a larger diameter than an outer guide portion, an inner control volume, and an inner restriction orifice for restricting the flow of pressurized supply fuel to the inner control volume to create a fuel pressure bias closing force which advantageously slows down the opening of the needle valve element. The fuel pressure bias closing force increases as the needle valve element opens thereby causing the needle valve element to hover in an open position without contacting a hard stop. The inner control volume…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.