Internal combustion engine control device
An internal combustion engine control device ( 1 ) includes an injector-temperature calculation unit ( 21 a ), an engine-temperature calculation unit ( 21 b ), an operating-state control unit ( 21 c ), and an integration-time calculation unit ( 21 d ). The engine-temperature calculation unit ( 21 b ) calculates an engine temperature by using an injector temperature and a fuel-injection integration time.
1. An internal combustion engine control device applied to an internal combustion engine, the internal combustion engine control device comprising:
an injector-temperature calculation unit that calculates an injector temperature based on a coil resistance value of an injector;
an internal-combustion-engine temperature calculation unit that calculates a temperature of the internal combustion engine based on the injector temperature; and
an operating-state control unit that controls an operating state of the internal combustion engine based on the temperature of the internal combustion engine,
wherein the internal combustion engine control device further comprises an integration-time calculation unit that calculates a driving time of the injector and calculates a fuel-injection integration time obtained by integrating the driving time in a predetermined period, and
the internal-combustion-engine temperature calculation unit calculates an injector cooling amount based on the fuel-injection integration time, and calculates the temperature of the internal combustion engine based on a corrected injector temperature calculated by correcting the injector temperature with the injector cooling amount, or calculates the temperature of the internal combustion engine by correcting a base temperature of the internal combustion engine, calculated on the basis of the injector temperature, with the injector cooling amount.
2. The internal combustion engine control device according to claim 1 , wherein the internal-combustion-engine temperature calculation unit calculates the injector cooling-amount target value based on a value obtained by dividing the fuel-injection integration time by the predetermined period.
3. The internal combustion engine control device according to claim 1 , wherein the internal-combustion-engine temperature calculation unit calculates an injector cooling-amount target value having a correlation with the fuel-injection integration time in the predetermined period, and when the internal-combustion-engine temperature calculation unit calculates the injector cooling amount, the internal-combustion-engine temperature calculation unit gradually shifts the injector cooling amount toward the injector cooling-amount target value.