Fuel injection device

Details Fuel injection device Fuel injection device

2005-06-28

2005-06-28

Lo, Weilun (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

C123S447000, C123S467000

Reexamination Certificate

active

06910463

ABSTRACT:
A check valve (8) and a booster (9) are inserted in parallel in a supplied fuel line (6) connecting a common rail (5) and an injection valve (7), a piston (10E) of a hydraulic circuit (10) is driven for positioning by a piezoelectric actuator (PA-1), the pressures in a chamber (9Db) of the booster (9) and the pressure in a fuel chamber (7G) of the injection valve (7) are selectively lowered by controlling the alignment state between ports (10Eb), (10Ec) provided in the piston (10E) to communicate with a low-pressure portion and an opening10Aa of a first chamber10A and an opening (10Ba) of a second chamber (10B) of cylinder (10C), whereby the pressure of the fuel supplied to the fuel reservoir (7B) of the injection valve (7) is rapidly switched to one or the other of high-pressure fuel from the common rail (5) and pressure-boosted high-pressure fuel from the booster (9).

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patent: 5697342 (1997-12-01), Anderson et al.
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patent: 64-000352 (1989-01-01), None
patent: 08-021332 (1996-01-01), None

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