US 11,873,756 B2
Controller and control method for internal combustion engine
Yuki Suzuki, Kariya (JP); and Tomihisa Tsuchiya, Toyota (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Aichi-Ken (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Aichi-ken (JP)
Filed on Apr. 17, 2023, as Appl. No. 18/301,256.
Claims priority of application No. 2022-069002 (JP), filed on Apr. 19, 2022.
Prior Publication US 2023/0332535 A1, Oct. 19, 2023
Int. Cl. F02B 47/02 (2006.01); F02B 75/12 (2006.01)
CPC F02B 47/02 (2013.01) [F02B 2075/125 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A controller 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 controller comprises processing circuitry configured to execute:
a pressure calculation process that calculates a pressure of a gas in the crank chamber based on a running state of the internal combustion engine;
a first injection process that causes 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; and
a second injection process that causes 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
the processing circuitry is configured to set 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.