Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1985-11-08
1986-09-23
Cox, Ronald B.
Internal-combustion engines
Charge forming device
Fuel injection system
123506, 123496, F02B 300
Patent
active
046128930
ABSTRACT:
A fuel injection valve for an internal combustion engine, in which a lift-limiting plunger is slidably fitted in a plunger chamber to receive fuel pressure for limiting the lifting amount of a nozzle needle. A back pressure chamber is defined by an end face of the plunger remote from the nozzle needle as part of the plunger chamber. A selector valve is controlled by an electronic control unit to establish communication between the back pressure chamber and a fuel intake passageway during low speed/low load operation of the engine, whereby the nozzle needle is lifted through a limited stroke to obtain a reduced fuel injection rate as well as a prolonged fuel injection period. A pressure inlet chamber permanently communicates with the back pressure chamber and is selectively communicated with the fuel intake passageway and disconnected therefrom by the selector valve, in synchronism with selective establishment and interruption of communication between the back pressure chamber and the fuel intake passageway. An accumulator is slidably fitted within an accumulator chamber communicating with the pressure inlet chamber and liftable in a direction away from the pressure inlet chamber against the force of a return spring with an increase in the pressure within the latter chamber. Thus, a reduction in the fuel injection quantity caused by the limitation of the needle lift can be compensated for.
REFERENCES:
patent: 4437443 (1984-03-01), Hofbauer
patent: 4448168 (1984-05-01), Komada
patent: 4459959 (1984-07-01), Terada
patent: 4505244 (1985-03-01), Smith
patent: 4513719 (1985-04-01), Edo
Ishibashi Toru
Taira Shigeo
Cox Ronald B.
Diesel Kiki Co. Ltd.
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