Control device for vehicle having a relief valve

A control device for a vehicle equipped with a battery, a motor that receives electric power from the battery to drive the vehicle, and an internal combustion engine,

• said internal combustion engine including:
• a port injection valve that injects fuel into an intake passage;
• a fuel tank that stores the fuel to be injected from said port injection valve;
• a feed pump that sucks the fuel from said fuel tank and supplies the fuel to said port injection valve;
• and
• a relief valve that is provided along a path from said feed pump to said port injection valve to return the fuel to said fuel tank,
• said control device comprising:
• a fuel pressure sensor that detects a pressure of the fuel supplied to said port injection valve;
• and
• an electronic control unit that controls said feed pump based on a detected value from said fuel pressure sensor,
• said electronic control unit causing said relief valve to be opened while maintaining operation of said internal combustion engine, in which fuel is injected from said port injection valve, when variation in power required in said internal combustion engine continues to remain within a prescribed range for a prescribed period,
• said electronic control unit, during the execution of opening of said relief valve, restricts the variation in the power required in said internal combustion engine,
• said electronic control unit, during the execution of opening of said relief valve, determines a required charge/discharge amount for said battery in accordance with the restricted variation in the power required in said internal combustion engine.