CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

A control device for an internal combustion engine according to the present invention (the present device) changes the combustion state of air fuel mixture such that if at least the load on the engine 10 falls within the range between a first threshold value Pem1 and a second threshold value Pem2, a heat release rate gravity center position Gc is equal to a given crank angle θa independent of an engine load, or if the engine load falls within the range beyond the second threshold value Pem2, the heat release rate gravity center position Gc is changed to a value on a retarded angle side in a range closer to the retarded angle side than the given crank angle θa as the engine load is increased. A combustion state is changed by, for example, one or more of combustion parameters such as a main injection period of fuel, a fuel injection pressure (common-rail injection system pressure), the injection quantity, the timing, and the number of times of pilot injection, a turbocharging pressure, and an EGR amount.

主权项

1. A control device for an internal combustion engine,
the control device comprising: an electronic control unit configured to set a parameter for controlling a combustion state of fuel that is supplied to a cylinder of the internal combustion engine such that, if a load on the internal combustion engine at least falls within a range between a first threshold value and a second threshold value that is greater than the first threshold value, a heat release rate gravity center position of the internal combustion engine is a predetermined crank angle independent of the load on the internal combustion engine, and configured to set the parameter for controlling a combustion state of the internal combustion engine such that, if the load on the internal combustion engine falls within a range beyond the second threshold value, the heat release rate gravity center position is a crank angle closer to a retarded angle side as the load is increased, within a range on the retarded angle side from the predetermined crank angle.