| 摘要 |
PROBLEM TO BE SOLVED: To provide an internal combustion engine control unit capable of suppressing a degradation in the heat efficiency of an internal combustion engine to accompany the switchover of combustion modes and suppressing a response delay at a time of the switchover of the combustion modes.SOLUTION: A control unit of the present invention is applied to an internal combustion engine whose combustion modes can be switched over between a lean combustion mode and a stoichiometric combustion mode, changes an air-fuel ratio step by step by changing a fuel injection quantity and switches the combustion modes if an operating point of the internal combustion engine crosses switch lines La and Lb defined by an engine revolving speed and an engine torque of the internal combustion engine. The switch lines La and Lb are set on the basis of a predetermined intake air quantity that enables heat efficiency of the internal combustion engine to be maintained before and after the switchover of the combustion modes. A fluctuation in the engine torque to accompany the switchover of combustion modes is suppressed by a regenerative control of a second motor-generator. |
