Patent ID: 9103270
Filing Date: 2015-08-11
Classification: F01N,F02B,F02D,Y02T

Abstract:
1. A control apparatus for an internal combustion engine, comprising: an exhaust purification catalyst that is provided in an exhaust passage of the internal combustion engine and that purifies an exhaust gas; a turbosupercharger that has a turbine that is provided in the exhaust passage on an upstream side of the exhaust purification catalyst, and that supercharges intake air utilizing an exhaust pressure; a bypass passage that branches from the exhaust passage on an upstream side of the turbine, and that merges with the exhaust passage at a position that is on a downstream side of the turbine and on an upstream side of the exhaust purification catalyst; a waste gate valve that adjusts an amount of exhaust gas that flows through the bypass passage; an air-fuel ratio sensor that is arranged on a downstream side of a position where the exhaust passage and the bypass passage merge, and that detects an air-fuel ratio on an upstream side of the exhaust purification catalyst; first correction amount calculation means that calculates a first fuel injection correction amount based on a turbine passing transportation lag that corresponds to a time that is required for exhaust gas to flow from inside a cylinder to the air-fuel ratio sensor via the turbine of the turbosupercharger, and an output of the air-fuel ratio sensor; second correction amount calculation means that calculates a second fuel injection correction amount based on a bypass passing transportation lag that corresponds to a time that is required for exhaust gas to flow from inside a cylinder to the air-fuel ratio sensor via the bypass passage, and an output of the air-fuel ratio sensor; main correction amount selection means that, based on at least an open or a closed state of the waste gate valve, selects one fuel injection correction amount among the first and the second fuel injection correction amounts as a main feedback correction amount; and air-fuel ratio control means that corrects a fuel injection amount of the internal combustion engine based on the main feedback correction amount that is selected by the correction amount selection means, and executes air-fuel ratio feedback control so that an air-fuel ratio that is detected by the air-fuel ratio sensor matches a target air-fuel ratio.