Vehicle controller

A vehicle controller configured to control a vehicle, the vehicle comprising:

• an internal combustion engine capable of transmitting rotational power of a crankshaft to a driven wheel;
• a catalyst arranged in an exhaust passage of the internal combustion engine;
• a heater configured to generate heat by consuming electric power with the catalyst as a subject to be heated;
• a driving circuit configured to supply the heater with electric power of a battery;
• a breaking circuit configured to break an electrical path between the battery and the driving circuit;
• and
• an electric generator configured to convert the rotational power of the crankshaft into electric power and supply the driving circuit with the electric power, wherein
• the vehicle controller is configured to execute:
• an anomaly determination process of determining whether an anomaly where power is constantly supplied from the battery to the heater has occurred in the driving circuit;
• a breaking process of breaking the electrical path by operating the breaking circuit when determining that the anomaly has occurred in the driving circuit;
• and
• a duty cycle control process of alternately repeating an electric power generation execution period, during which the electric generator generates power, and an electric power generation stop period, during which the electric generator does not generate power, and controlling a duty cycle, which is a ratio of the electric power generation execution period to a single cycle of repeated cycles, when determining that the anomaly has occurred in the driving circuit, and
• the duty cycle control process includes at least one of two processes, which are a process of setting the duty cycle to be larger when a member in an overheatable region, in which overheating is possibly performed by the heater, has a low temperature than when the member has a high temperature and a process of setting the duty cycle to be larger when the internal combustion engine has a large intake air amount than when the internal combustion engine has a small intake air amount.