Patent ID: 8433499
Filing Date: 2013-04-30
Classification: B60W,F02B,F02D,Y02T

Abstract:
1. An apparatus for detecting imbalance abnormality in an air-fuel ratio between cylinders comprising: a turbine of a turbocharger disposed in an exhaust passage in a multi-cylinder internal combustion engine; a waist gate valve for opening/closing a bypass passage bypassing the turbine; an air-fuel ratio sensor disposed in the exhaust passage downstream of an outlet of the bypass passage; abnormality detecting means for detecting imbalance abnormality in an air-fuel ratio between cylinders based upon a variation degree in output of the air-fuel ratio sensor; a stepless transmission connected to the internal combustion engine; control means for controlling the internal combustion engine and the stepless transmission in such a manner that an actual operation point of the internal combustion engine moves on a predetermined operation line in a coordinate system defined by an engine rotational speed and engine torque; and changing means for changing the operation line in such a manner that, when the actual operation point is outside of a waist gate valve opening region in the coordinate system at the time of detecting the imbalance abnormality, the actual operation point moves into the waist gate valve opening region.