Patent ID: 8781712

Claim:
An engine control apparatus which controls operations of actuators to control combustion conditions in an engine, thereby controlling engine performances, comprising: target performance setting means for setting a target value of each of a plurality of performance parameters representing said engine performances based on operating conditions of the engine; target combustion setting means which uses first correlation data defining correlations between said plurality of performance parameters and a plurality of combustion parameters representing said combustion conditions to set target values of said plurality of combustion parameters based on the target values of the respective performance parameters, as set by said target performance setting means; and control command calculating means for calculating command values of controlled parameters associated with said actuators based on the target values of the respectively combustion parameters, as set by said target combustion setting means, and wherein said target performance setting means is equipped with target operating means which determines any of said plurality of performance parameters as an operated target in a condition where actual values of the performance parameters are controlled to the target values, as set by the target performance setting means, and operates the target value of the performance parameter, as determined as the operated target, to a performance enhancing side based on information about the performance parameters other than the operated target, and wherein said target operating means includes combustion parameter range calculating means which calculates operable ranges from current values of said plurality of combustion parameters when the target value of the performance parameter, as determined as the operated target, is operated, parameter change calculating means which uses the first correlation data to calculate changes in the plurality of performance parameters for the operable ranges based on the operable ranges, as calculated by said combustion parameter range calculating means, and target operating amount setting means which uses the changes in the plurality of performance parameters, as calculated by said parameter change calculating means, to set the change in the performance parameter that is the operated target as an operated amount of the target value thereof when the changes in the performance parameters other than the operated target are in given permissible ranges.