Internal combustion engine

Abstract

This invention provides a technology that can effectively suppress the accumulation of fuel-derived deposits in the intake system of an internal combustion engine. [Solution] The internal combustion engine comprises a first injection valve that injects fuel into the intake port, a second injection valve that injects fuel into the cylinder of the internal combustion engine, and a control unit that controls the in-cylinder injection ratio, which is the ratio of the in-cylinder injection amount to the total amount of the port injection amount (fuel injection amount from the first injection valve) and the in-cylinder injection amount (fuel injection amount from the second injection valve). The control unit of the internal combustion engine is configured to increase the in-cylinder injection ratio when the cumulative value of the time the internal combustion engine has been operated in a target operating state, which is an operating state in which the in-cylinder injection ratio is 0% in a predetermined low-load, low-speed operating range, exceeds a threshold.

Claims

1. A first injection valve that injects fuel into the intake port of an internal combustion engine, A second injection valve that injects fuel into the cylinder of the internal combustion engine, A control unit controls the in-cylinder injection ratio, which is the ratio of the in-cylinder injection amount to the total amount of the port injection amount, which is the fuel injection amount of the first injection valve, and the in-cylinder injection amount, which is the fuel injection amount of the second injection valve. Equipped with, The control unit is configured to increase the in-cylinder injection ratio when the cumulative value of the time the internal combustion engine has been operated in a target operating state, which is an operating state in which the in-cylinder injection ratio is 0% in a predetermined low-load, low-speed operating range, exceeds a threshold value. Internal combustion engine.

2. The threshold is set according to at least one of the following: the area where the vehicle equipped with the internal combustion engine was last refueled, the time when the vehicle was last refueled, and the ambient temperature. The internal combustion engine according to claim 1.

3. When the cumulative value is less than the threshold and the operating state of the internal combustion engine is in the target operating state, the radiator fan operates. The control unit increases the in-cylinder injection ratio in response to the operation of the radiator fan. The internal combustion engine according to claim 1.

4. When the cumulative value is less than the threshold and the operating state of the internal combustion engine is in the target operating state, if the vehicle equipped with the internal combustion engine is driven, The control unit increases the in-cylinder injection ratio in response to the vehicle's movement. The internal combustion engine according to claim 1.

5. Increasing the in-cylinder injection ratio includes increasing the in-cylinder injection ratio in stages. The internal combustion engine according to claim 1.

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