Controller for vehicle on-board internal combustion engine

A controller for a vehicle on-board internal combustion engine, the controller comprising control circuitry, wherein

• the vehicle on-board internal combustion engine is an internal combustion engine mounted on a vehicle,
• the vehicle includes:
• a fuel tank;
• a fuel supply device;
• an operation switch that switches between operation and stopping of the internal combustion engine;
• and
• a rain sensor that detects a degree of droplet adhesion to a windshield,
• the fuel supply device includes:
• an electric fuel pump that delivers fuel from the fuel tank;
• a fuel supply passage through which the fuel delivered by the fuel pump flows;
• a fuel injection valve including a first end connected to the fuel supply passage and a second end connected to an intake passage of the internal combustion engine and provided with an injection hole, the fuel injection valve injecting fuel in the fuel supply passage from the injection hole into the intake passage;
• and
• a seal member that seals a gap between the fuel injection valve and the intake passage, the seal member being provided in a state of being sandwiched between the fuel injection valve and the intake passage in an injection direction of the fuel injection valve;
• and
• the control circuitry is configured to actuate the fuel pump when a logical conjunction of following conditions is satisfied:
• (i) a condition in which operation of the internal combustion engine has been stopped by manipulation of the operation switch;
• and
• (ii) a condition in which the degree of droplet adhesion detected by the rain sensor is greater than or equal to a prescribed value.