Internal combustion engine

An internal combustion engine comprising:

• a first injection valve configured to inject a fuel into an intake port of the internal combustion engine;
• a second injection valve configured to inject a fuel into a cylinder of the internal combustion engine;
• and
• a controller configured to control an in-cylinder injection ratio that is a ratio of an in-cylinder injection amount to a total amount of a port injection amount and the in-cylinder injection amount, the port injection amount being a fuel injection amount of the first injection valve and the in-cylinder injection amount being a fuel injection amount of the second injection valve,
• wherein the controller is configured to increase the in-cylinder injection ratio in response to an integrated value of time during which the internal combustion engine has been operated in a target operation state reaching or exceeding a threshold, the target operation state being an operation state in which the in-cylinder injection ratio is 0% in a low-load low-speed operation region that is predetermined.