A Security Enhanced Linux system implementing extended policy models and method for their enforcement, is provided. Alternatively, the sensor retainer may include a fixing member for mounting a derailleur or other transmission to a bicycle frame and a sensor element mounted to the fixing member. Meanwhile, when the upper limit decelerating torque is smaller than the requested decelerating torque, the vehicle ECU engages the clutch and controls the engine and the electric motor so that the sum of a decelerating torque generated by the engine and a decelerating torque generated by the electric motor is equal to the requested decelerating torque.