Engine fuel injection device and engine fuel injection method

Details Engine fuel injection device and engine fuel injection method Engine fuel injection device and engine fuel injection method

2005-12-27

2005-12-27

Kwon, John T. (Department: 3747)

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

Stratification in combustion chamber

C123S431000

Reexamination Certificate

active

06978763

ABSTRACT:
A fuel injection device for an engine includes a direct injector and an intake passage injector. When the engine load is relatively low, a fuel pressure lowering procedure is executed for lowering the pressure of fuel supplied to the direct injector. An ECU sets a fuel injection ratio, which is the ratio between the fuel injection amount of the direct injector and that of the intake passage injector, based on the engine operation state. The ECU changes the fuel injection ratio such that the ratio of the fuel injection amount of the direct injector to the total amount of the fuel fed to a combustion chamber is decreased, until the pressure of the fuel supplied to the direct injector is raised from the value lowered through the fuel pressure lowering procedure to a predetermined permissible value. This effectively suppresses hampering of the engine combustion, caused by the lowered fuel pressure.

REFERENCES:
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patent: 6715464 (2004-04-01), Heimberg
patent: 2002/0040692 (2002-04-01), LaPointe et al.
patent: 2004/0149255 (2004-08-01), zur Loye et al.
patent: 2005/0178360 (2005-08-01), Satou
patent: 2001-336439 (2001-12-01), None
patent: 2002-364409 (2002-12-01), None

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