Pressure modulated common rail injector and system

Details Pressure modulated common rail injector and system Pressure modulated common rail injector and system

2006-04-04

2006-04-04

Hwu, Davis (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Fluid pressure responsive discharge modifier* or flow...

Fuel injector or burner

C239S088000, C239S533100, C239S124000, C239S533800, C239S585100, C239S585500, C239S005000

Reexamination Certificate

active

07021565

ABSTRACT:
Common rail fuel injectors typically have difficulty in changing an injection rate during an injection event. Fuel injectors for this common rail fuel injection system include a multi-position admission valve. The admission valve is stoppable at a middle position to inject fuel at a low rate. The lower rate is accomplished by leaking some fuel to drain to reduce injection pressure. The admission valve is also stoppable at a fully open position to inject fuel at a high rate. Fuel injection events are ended, and the fuel injectors maintained between injection events, with the admission valve member in contact with a supply seat to close the high pressure supply passage. This strategy can be used in conjunction with a spring-biased needle valve member to expand fuel injector capabilities.

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