Vehicle controller, vehicle control method, and memory medium

A vehicle control method employed in a vehicle that includes an internal combustion engine, the vehicle control method comprising:

• determining, by execution circuitry, whether a PCV valve of a blow-by gas processing device is closed, wherein
• a forced-induction device of the internal combustion engine includes a turbine disposed on an exhaust passage and a compressor disposed on an intake passage of the internal combustion engine,
• the blow-by gas processing device includes a supply passage through which blow-by gas is supplied to the intake passage,
• the supply passage includes a first passage and a second passage, the first passage being connected to a portion of the intake passage downstream of the compressor, and the second passage being connected to a portion of the intake passage upstream of the compressor,
• the PCV valve is located on the first passage,
• the first passage includes a connection portion connected to the intake passage,
• a portion of the first passage between the connection portion and the PCV valve is a passage downstream portion, and
• the PCV valve is closed when pressure in the passage downstream portion becomes greater than or equal to a specified pressure;
• determining, by the execution circuitry, whether the supply passage is supercooled by relative wind of the vehicle based on a travel speed of the vehicle;
• and
• setting, by the execution circuitry, the pressure in the passage downstream portion to be less than the specified pressure by setting operation of the internal combustion engine to non-boosting operation when a condition in which an ambient temperature of the vehicle is less than or equal to a determination temperature, a condition in which the PCV valve is determined as being closed, and a condition in which the supply passage is determined as being supercooled are all satisfied, wherein
• boosting operation is operation of the internal combustion engine in which intake air flowing through the intake passage is pressurized using the forced-induction device, and
• the non-boosting operation is operation of the internal combustion engine in which the intake air is not pressurized using the forced-induction device.

A non-transitory computer-readable memory medium that stores a program for causing a processor to execute a vehicle control process employed in a vehicle that includes an internal combustion engine, the vehicle control process comprising:

• determining, by execution circuitry, whether a PCV valve of a blow-by gas processing device is closed, wherein
• a forced-induction device of the internal combustion engine includes a turbine disposed on an exhaust passage and a compressor disposed on an intake passage of the internal combustion engine,
• the blow-by gas processing device includes a supply passage through which blow-by gas is supplied to the intake passage,
• the supply passage includes a first passage and a second passage, the first passage being connected to a portion of the intake passage downstream of the compressor, and the second passage being connected to a portion of the intake passage upstream of the compressor,
• the PCV valve is located on the first passage,
• the first passage includes a connection portion connected to the intake passage,
• a portion of the first passage between the connection portion and the PCV valve is a passage downstream portion, and
• the PCV valve is closed when pressure in the passage downstream portion becomes greater than or equal to a specified pressure;
• determining, by the execution circuitry, whether the supply passage is supercooled by relative wind of the vehicle based on a travel speed of the vehicle;
• and
• setting, by the execution circuitry, the pressure in the passage downstream portion to be less than the specified pressure by setting operation of the internal combustion engine to non-boosting operation when a condition in which an ambient temperature of the vehicle is less than or equal to a determination temperature, a condition in which the PCV valve is determined as being closed, and a condition in which the supply passage is determined as being supercooled are all satisfied, wherein
• boosting operation is operation of the internal combustion engine in which intake air flowing through the intake passage is pressurized using the forced-induction device, and
• the non-boosting operation is operation of the internal combustion engine in which the intake air is not pressurized using the forced-induction device.