Patent ID: 9216725
Filing Date: 2015-12-22
Classification: B60K,B60W,F01N,F02D

Abstract:
1. A control apparatus for a hybrid vehicle, the control apparatus comprising: an engine configured to change a combustion air-fuel ratio; an exhaust gas purification catalyst configured to absorb and reduce nitrogen oxides in exhaust gas of the engine; a first motor-generator; an output section configured to transfer torque from the engine to driving wheels of the hybrid vehicle; a differential mechanism configured to distribute the torque from the engine to the first motor generator and the output section; a second motor-generator connected to the output section through gears; a controller configured to: execute a temporarily changing of the combustion air-fuel ratio of the engine to a rich side as a rich spike operation when a specified condition is determined to be satisfied and restrict temporarily changing the combustion air-fuel ratio of the engine to a rich side as a rich spike operation when a first condition, of the specified condition, is determined to not be satisfied, wherein the specified condition includes: the first condition that a motor torque of the second motor-generator deviates from a rich spike prohibition torque range including 0 Nm torque; and a second condition that a nitrogen oxide concentration of the exhaust gas purification catalyst exceeds a threshold which is smaller than an upper allowable limit value of a nitrogen oxide concentration for the exhaust purification catalyst.