Hydraulically-actuated fuel injector with rate shaping through restricted flow to intensifier piston
US6085992A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1998 |
| Grant date | Jul 11, 2000 |
| Priority date | — |
| Expiry date | Nov 19, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M59/105
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A hydraulically actuated fuel injector includes an injector body containing an intensifier piston with a hydraulic surface exposed to fluid pressure in a hydraulic pressure cavity. This hydraulic surface includes an annular taper and moves within a bore due to the pressure in the hydraulic pressure cavity. Prior to the injection event, the intensifier piston is in a retracted position that partially blocks at least one actuation fluid supply passage. At the initiation of the injection event, the partial blocking of the actuation fluid passage results in a slower initial movement rate of the intensifier piston. The injection flow rate is a function of the speed of the intensifier piston. The initial rate shaping is accomplished by controlling the initial speed of the intensifier piston by at least partially blocking one or more of the actuation fluid supply passages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.