Method for controlling series hybrid vehicle, and series hybrid vehicle

A series hybrid vehicle comprising:

• an internal combustion engine;
• an electric power generation motor that is driven by motive power of the internal combustion engine;
• a drive motor that is driven by electric power generated by the electric power generation motor;
• and
• a controller that controls the internal combustion engine such that an engine rotational speed of the internal combustion engine is equal or smaller than an upper limit rotational speed and controls the drive motor to generate regenerative torque in response to a deceleration request during deceleration,
• the drive motor and the internal combustion engine being supported in a vehicle body via a plurality of mount members in an integrated state,
• the controller being configured to restrict the regenerative torque such that the regenerative torque does not exceed a regenerative torque upper limit value when the drive motor generates the regenerative torque in response to the deceleration request while the electric power generation motor is driven by the internal combustion engine,
• the controller being configured to calculate the regenerative torque upper limit value such that the regenerative torque is restricted to a magnitude at which a floor vibration generation region is lower than the upper limit rotational speed of the internal combustion engine, the floor vibration generation region being a region of engine rotational speeds at which resonance occurs in a floor of the vehicle body, the floor vibration generation region varying according to the regenerative torque.