US 12,286,939 B2
Controller and control method for internal combustion engine
Yuki Suzuki, Kariya (JP); Tomihisa Tsuchiya, Toyota (JP); and Jun Miyagawa, Numazu (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Aug. 24, 2023, as Appl. No. 18/454,944.
Claims priority of application No. 2022-157859 (JP), filed on Sep. 30, 2022.
Prior Publication US 2024/0110534 A1, Apr. 4, 2024
Int. Cl. F02D 19/02 (2006.01); F02D 41/00 (2006.01); F02D 41/38 (2006.01); F02M 21/02 (2006.01)
CPC F02D 41/38 (2013.01) [F02D 41/0027 (2013.01); F02D 2041/389 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A controller for an internal combustion engine, the internal combustion engine including a cylinder and a direct injection valve that injects gaseous fuel into the cylinder, the controller being processing circuitry that controls an operation of the internal combustion engine, wherein
the processing circuitry is configured to
acquire an in-cylinder pressure that is a pressure in the cylinder during one combustion cycle of the cylinder and a supply fuel pressure that is a pressure of the gaseous fuel supplied to the direct injection valve,
calculate a backflow rate, which is an amount of combustion gas flowing into the direct injection valve from the cylinder during one combustion cycle of the cylinder; and
in the calculation of the backflow rate, calculate the backflow rate such that the backflow rate becomes larger as the in-cylinder pressure increases, and the backflow rate becomes larger as the supply fuel pressure decreases.