Control device for internal combustion engine

A control device for an internal combustion engine, the control device comprising:

• a plurality of requirement output means for outputting requirements concerning torque efficiency, which indicates a ratio of a required torque to a reference torque that is obtained when operating points of the plurality of actuators are optimized, for the internal combustion engine on the basis of their respective aims;
• mediation means for mediating the requirements concerning the torque efficiency output from the plurality of requirement output means in accordance with a predetermined mediation rule and calculating a target value of the torque efficiency from a result of mediation;
• and
• actuator instruction value determination means for determining instruction values for the plurality of actuators installed in the internal combustion engine on the basis of the target value of the torque efficiency calculated by the mediation means;
• wherein
• the plurality of requirement output means include means for outputting a value concerning an average acceptable decreasing amount of the torque efficiency with reference to the maximum value of the torque efficiency and means for calculating sequentially a value concerning a required decreasing amount of the torque efficiency with reference to the maximum value of the torque efficiency;
• and
• the mediation means selects the required decreasing amount as the result of mediation when the required decreasing amount is smaller than the acceptable decreasing amount and selects the smaller value of the required decreasing amount and the maximum value of the torque efficiency decreasing amount within the range where the integration value of the record of the torque efficiency decreasing amount resulted from the mediation does not exceed the integration value of the record of the acceptable decreasing amount as the result of mediation when the required decreasing amount is larger than the acceptable decreasing amount.