System for diagnosing and controlling high-pressure fuel system

Details System for diagnosing and controlling high-pressure fuel system System for diagnosing and controlling high-pressure fuel system

1998-09-01

2000-10-31

Dolinar, Andrew M.

Internal-combustion engines

Combustion chamber means having fuel injection only

Combustible mixture stratification means

123305, 123690, 123479, F02D 4122

Patent

active

061386383

ABSTRACT:
A system for controlling an in-cylinder fuel injection engine determines that a high-pressure fuel system is abnormal, when meeting at least one of conditions that the fuel pressure Pf of the high-pressure fuel system does not reach a preset pressure PFS (S24) even if a predetermined period of time elapses after the engine start-up (S22), that the fuel pressure Pf of the high-pressure fuel system is not within an ordinary fuel pressure range defined by the lower limit PFL and the upper limit PFH after the engine start-up (S27, S28), and that the fuel injection pulse width Ti continues to exceed the upper limit TiNGMAX, which can not usually be obtained, for a predetermined period of time at a lean air-fuel ratio (S30.about.S33). Thus, the abnormality of the high-pressure fuel system of the in-cylinder fuel injection engine can be accurately diagnosed.

REFERENCES:
patent: 5241933 (1993-09-01), Morikawa

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