Directly controlled fuel injector with pilot plus main injection sequence capability
US6910462B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 2004 |
| Grant date | Jun 28, 2005 |
| Priority date | — |
| Expiry date | Aug 16, 2024 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/403
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In one class of fuel injection systems, the individual fuel injectors cycle between high and low pressure during and between injection sequences in a given engine cycle. The fuel injectors may be hydraulically actuated, mechanically actuated, and possibly include common rail injectors equipped with an admission valve that enable the fuel injectors to cycle between high and low pressures. Many of these fuel injection systems also include a directly controlled nozzle valve that can apply or relieve pressure on a closing hydraulic surface associated with the nozzle valve. The nozzle valve is typically spring-biased and therefore has a pre-defined valve opening pressure that defines at what fuel pressure the nozzle valve will open when pressure is relieved on its closing hydraulic surface. While these fuel injection systems can produce a wide variety of rate shapes and injection sequences, generally, an injection sequence of particular interest is one that includes a relatively small volume pilot injection followed quickly in time by a relatively large volume main injection. In order to make the accuracy of the pilot injection more consistent, the nozzle valve is held closed while fuel…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.