Internal combustion engine control device

Abstract

To achieve both suppression of the decrease in the controllability of the output torque of the internal combustion engine and improvement of the exhaust characteristics of the internal combustion engine. [Solution] The internal combustion engine 10 uses hydrogen as fuel. The internal combustion engine 10 comprises a cylinder 11, a fuel injector 13, an exhaust passage 14, and a catalyst 19 installed in the exhaust passage 14. The control device 60 applied to the internal combustion engine 10 comprises a processing circuit 61. The processing circuit 61 obtains the catalyst temperature, which is the temperature of the catalyst 19. The processing circuit 61 sets the upper limit guard of the fuel injection amount of the fuel injector 13 so that the higher the catalyst temperature, the larger the upper limit guard of the fuel injection amount of the fuel injector 13 becomes. The processing circuit 61 operates the fuel injector 13 so that the fuel injection amount of the fuel injector 13 does not exceed the upper limit guard.

Claims

1. This invention relates to an internal combustion engine that uses hydrogen as fuel, comprising: a cylinder; a fuel injection valve for injecting the fuel supplied into the cylinder; an exhaust passage through which exhaust gas discharged from the cylinder flows; and a catalyst installed in the exhaust passage. The system includes a processing circuit that controls the amount of fuel injected by the fuel injector, The aforementioned processing circuit is A temperature acquisition process to acquire the catalyst temperature, which is the temperature of the catalyst, A guard setting process that sets the upper limit guard of the fuel injection amount of the fuel injector so that the higher the catalyst temperature, the larger the upper limit guard of the fuel injection amount of the fuel injector, The process of operating the fuel injector so that the amount of fuel injected by the fuel injector does not exceed the upper limit guard is performed. Internal combustion engine control device.

2. The aforementioned internal combustion engine is equipped with a supercharger, The aforementioned processing circuit is A basic injection amount calculation process that calculates a basic value for the fuel injection amount of the fuel injector based on the required engine torque, A target injection amount setting process is performed, which sets the smaller of the base value of the fuel injection amount and the upper limit guard as the target value of the fuel injection amount of the fuel injection valve. In the injection process, the fuel injection valve is operated based on the target value of the fuel injection amount. The internal combustion engine control device according to claim 1.

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