Variable output pump for gasoline direct injection
US6422203B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 5, 2001 |
| Grant date | Jul 23, 2002 |
| Priority date | — |
| Expiry date | Dec 5, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M63/0225
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An electronic engine management unit includes means for actuating each injector individually at a selected different time, and for a prescribed interval, during each cycle of the engine. A high pressure fuel supply pump having a high pressure discharge passage is fluidly connected to the common rail, and to a low pressure feed fuel inlet passage. A control subsystem controls the discharge pressure of the pump between injection events, by diverting the pump discharge so that instead of delivery to the common rail, the flow recirculates through the pump at a lower pressure. This is preferably accomplished by an inlet control passage fluidly connected to the low pressure feed fuel inlet passage, a discharge control passage fluidly connected to the high pressure discharge passage, and a non-return check valve in the high pressure discharge passage, between the discharge control passage and the common rail, which opens toward the common rail. A control valve is fluidly connected to the inlet control passage and to the discharge control passage, and switch means are coordinated with the means for actuating each injector. While the pump discharge passes through the control circuit but imm…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.