Patent ID: 11873756
Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 6:
7. A control method for an internal combustion engine, the internal combustion engine including:
a cylinder;
an intake passage including a connection port connected to the cylinder;
a water injection valve configured to inject water into the intake passage;
an intake valve configured to selectively open and close the connection port; and
a crank chamber connected to the cylinder and that accommodates a crankshaft, wherein
the control method comprises:
calculating a pressure of a gas in the crank chamber based on a running state of the internal combustion engine;
causing the water injection valve to inject a first injection amount of water into the intake passage when the intake valve is open in a single combustion cycle;
causing the water injection valve to inject a second injection amount of water into the intake passage when the intake valve is closed in the single combustion cycle; and
setting a ratio of the first injection amount of water to a sum of the first injection amount of water and the second injection amount of water to a smaller value when the pressure of the gas in the crank chamber is greater than or equal to a specified value than when the pressure of the gas in the crank chamber is less than the specified value, the specified value being defined in advance.