Vehicle system

A vehicle system, comprising:

• a regenerative braking device configured to recover kinetic energy of a vehicle during deceleration of the vehicle to convert the kinetic energy into electric power;
• a battery configured to charge the electric power;
• an internal combustion engine including a fuel injection valve and a throttle valve arranged in an intake air passage;
• and
• a control device configured to control the internal combustion engine and the regenerative braking device,
• wherein the control device is configured to:
• execute, where depression of an accelerator pedal is released when the battery is in a non-fully charged state, a fuel cut processing to control the fuel injection valve to stop fuel injection and a regenerative braking processing to actuate the regenerative braking device;
• and
• execute, where depression of the accelerator pedal is released when the battery is in a fully charged state and engine speed is higher than a threshold value, the fuel cut processing and a throttle opening degree increase processing to control the throttle valve such that an opening degree of the throttle valve becomes greater than an opening degree used where depression of the accelerator pedal is released in the non-fully charged state.