Method and apparatus for measuring output characteristic of air-fuel ratio detecting means

摘要

PROBLEM TO BE SOLVED: To accurately measure an output characteristic of an air fuel ratio detecting module regardless of the contacting strength of emission gas for every cylinder against the air fuel ratio detecting module.;SOLUTION: In the method for measuring an output characteristic of an air fuel ratio sensor 47, the output characteristic of the air fuel ratio sensor 47 is measured based on an output value of the air fuel ratio sensor 47 when changing a fuel injection amount. Under a predetermined condition, an increase in the fuel injection amount is started from a particular cylinder and the increase in the fuel injection amount is continued for a given time period, or a decrease in the fuel injection amount is started from the particular cylinder and the decrease in the fuel injection amount is continued for the given time period.;COPYRIGHT: (C)2011,JPO&INPIT