Diagnostic system for a secondary air supplier in an engine

Details Diagnostic system for a secondary air supplier in an engine Diagnostic system for a secondary air supplier in an engine

1993-04-02

1994-07-05

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 60289, F01N 320

Patent

active

053256638

ABSTRACT:
An engine controller executes the feedback control of an amount of the fuel injected, such that an air-fuel ratio (A/F) of the exhaust gas approaches a theoretical ratio. The amount of the fuel injected is as a function of a changeable feedback correction factor (FAF). When the engine is in a predetermined condition in which the engine controller interrupts the feedback control, a secondary air supplier supplies secondary air from an intake passage to an exhaust passage, and changes the A/F ratio of the exhaust gas. Furthermore, when the engine controller executes the feedback control operation, the secondary air is temporarily supplied to the exhaust passage, for the purpose of diagnosis of the supplier. The diagnostic system detects a first feedback correction factor before the secondary air is supplied, and a second feedback correction factor after the secondary air has been supplied, and calculates a deviation value therebetween. The system determines that the secondary air supplier is malfunctioning, when the deviation value (.DELTA.FAF) is smaller than a predetermined value (.alpha.).

REFERENCES:
patent: 5060474 (1991-10-01), Aramaki
patent: 5113651 (1992-05-01), Kotzan
patent: 5119631 (1992-06-01), Kayanuma et al.
patent: 5140810 (1992-08-01), Kuroda

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