Patent ID: 7558667
Filing Date: 2009-07-07
Classification: F02D

Abstract:
1. An apparatus for detecting an assembled state of gas sensors in a vehicle, wherein said vehicle is equipped with an engine including a plurality of exhaust systems, a plurality of groups of cylinders which are installed so as to correspond to said plurality of exhaust systems, and a gas sensor which is assembled in each of said plurality of exhaust systems and which detects an oxygen concentration in an exhaust gas for an air-fuel ratio feedback control of said engine based on a signal detected by said gas sensor, the apparatus for detecting an assembled state of said gas sensor comprising: means for controlling a value of an engine control parameter which affects the air-fuel ratio of said engine, so that the values are different from each other for said plurality of groups of cylinders which correspond to said plurality of exhaust systems; means for judging whether an output from said gas sensor which is installed in each of said plurality of exhaust systems is a normal output which corresponds to the value of said engine control parameter; and means for giving notice of a result of the judgment made by said means for judging.