Failure detecting device for a fuel supply system of an internal

Details Failure detecting device for a fuel supply system of an internal Failure detecting device for a fuel supply system of an internal

1996-03-12

1997-06-03

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123698, F02D 4114, F02D 4122

Patent

active

056344546

ABSTRACT:
In the present invention, the fuel injection amount of the engine is determined by an air-fuel ratio feedback correction factor FAF and a feedback learning correction factor KG and a fuel vapor learning correction factor FGPG. When the fuel vapor is supplied to the engine, the value of FGPG is adjusted so that the center value of the fluctuation of FAF agrees with 1.0 while the value of KG is held at the value before the fuel vapor supply started. On the other hand, when the fuel vapor is not supplied to the engine, the value of KG is adjusted so that the center value of the fluctuation of FAF agrees with 1.0 while the value of FGPG is set at 0. Therefore, the value (FAF+KG) indicates whether a failure has occurred in the fuel supply system regardless of the fuel vapor supply to the engine. Further, if the value (FAF+KG) becomes larger than or smaller than a predetermined range when the fuel vapor is supplied to the engine, i.e., if it is determined that the fuel supply system has failed when the fuel vapor is supplied to the engine, the fuel vapor supply is stopped, and determination whether the value (FAF+KG) is larger than or smaller than a predetermined range, is carried out again after the fuel vapor supply has been stopped. Therefore, an error in failure detection can be eliminated.

REFERENCES:
patent: 5070847 (1991-12-01), Akiyama et al.
patent: 5559706 (1996-09-01), Fujita

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