ENGINE CONTROL DEVICE

摘要

A control device for an engine provided with a turbocharger properly uses a parameter used for controlling a center-of-gravity position of a heat generation rate determined by a heat generation rate as the amount per unit crank angle of heat generated by combustion of fuel depending on operating situations of the engine and a vehicle in which the engine is mounted. Specifically, an increase in a turbocharging pressure of the turbocharger is executed when a rotational speed of the engine and a speed of the vehicle in which the engine is mounted are lower than predetermined reference values in a case where the center-of-gravity position of a heat generation rate is further on a retard side than a predetermined crank angle and one or both of an increase in a fuel injection pressure and advancing of a fuel injection timing are executed when the rotational speed of the engine or the speed of the vehicle in which the engine is mounted are equal to or higher than the predetermined reference values in the case where the center-of-gravity position of a heat generation rate is further on the retard side than the predetermined crank angle. Then, fuel economy can be improved by the center-of-gravity position of a heat generation rate being maintained at a predetermined fixed value regardless of a load of the engine and/or the engine rotational speed while an increase in noise and vibration a user feels uncomfortable with is suppressed.

主权项

1. A control device for an internal combustion engine, the internal combustion engine including a turbocharger, the control device comprising:
an electronic control unit configured to set a combustion parameter of the internal combustion engine such that a center-of-gravity position of a heat generation rate of the internal combustion engine corresponds to a first crank angle in a case where a load of the internal combustion engine is within a range between at least a first threshold and a second threshold exceeding the first threshold, the center-of-gravity position of the heat generation rate being a position determined based on the heat generation rate as an amount per unit crank angle of heat generated by combustion of fuel supplied to a cylinder of the internal combustion engine, wherein the electronic control unit is configured to control the internal combustion engine by increasing a turbocharging pressure of the turbocharger such that the center-of-gravity position of the heat generation rate corresponds to the first crank angle when the center-of-gravity position of the heat generation rate is further on a retard side than the first crank angle, a rotational speed of the internal combustion engine is lower than a first rotational speed, and a speed of a vehicle in which the internal combustion engine is mounted is lower than a first speed, and wherein the electronic control unit is configured to control the internal combustion engine by executing one or both of an increase in a fuel injection pressure and advancing of a fuel injection timing such that the center-of-gravity position of the heat generation rate corresponds to the first crank angle when the center-of-gravity position of the heat generation rate is further on the retard side than the first crank angle and the rotational speed of the engine is equal to or higher than the first rotational speed or the speed of the vehicle is equal to or higher than the first speed.