Fuel injection apparatus for engines and method of operating...

Details Fuel injection apparatus for engines and method of operating... Fuel injection apparatus for engines and method of operating...

2007-06-29

2009-06-16

Moulis, Thomas N (Department: 3747)

Internal-combustion engines

Charge forming device

With fuel pump

C123S446000, C123S501000

Reexamination Certificate

active

07546831

ABSTRACT:
A fuel injection apparatus for engines is provided, with which occurrence of cavitation erosion on constituent parts of the high pressure fuel pump and fuel feed line to the pump in the apparatus is suppressed and high durability is attained even in the case of a high pressure fuel pump increased largely in capacity. Each of high pressure fuel pumps to supply high pressure fuel to a common rail comprises an electromagnetic valve which is controlled by a controller such that fuel is discharged from the plunger room by closing the electromagnetic valve in the up stroke of the plunger until the plunger reaches its top dead center, the electromagnetic valve is kept closed for some period in the down stroke of the plunger, then the electromagnetic valve is opened to allow the plunger room to be communicated with a fuel feed/spill passage.

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