Secondary air supplying apparatus for internal combustion engine

Details Secondary air supplying apparatus for internal combustion engine Secondary air supplying apparatus for internal combustion engine

1996-03-04

1998-01-13

Wolfe, Willis R.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60289, F01N 322

Patent

active

057066531

ABSTRACT:
A secondary air supply apparatus for an internal combustion engine is provided with an air-fuel ratio sensor disposed upstream of an catalytic converter in an exhaust passage. An outlet port of a secondary air supply conduit is formed upstream of and in the vicinity of the air-fuel ratio sensor. Air discharged from an air pump is supplied to the exhaust passage through the secondary air supply conduit. A control unit diagnoses as to whether or not the air-fuel ratio sensor is activated by checking as to whether a detection signal of the air-fuel ratio sensor is out of a predetermined range or not. Then, the control unit diagnoses as to whether the supply of the secondary air is normal or not on the basis of the detection signal of the air-fuel ratio sensor. Therefore, the diagnosis of the supply of the secondary air is correctly executed.

REFERENCES:
patent: 5119631 (1992-06-01), Kayanuma et al.
patent: 5325663 (1994-07-01), Itoh
patent: 5333446 (1994-08-01), Itoh
patent: 5381658 (1995-01-01), Meguro
patent: 5526642 (1996-06-01), Dambach et al.

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