AUTOMOBILE OSCILLATION IMPROVING DEVICE AND METHOD THEREOF

An apparatus and a method for improving a vibration of a vehicle are provided to reduce an RPM(Revolutions Per Minute) of a motor-generator exponentially by controlling an output current of a motor control unit provided to the motor-generator. An apparatus for improving a vibration of a vehicle includes an engine(10), a motor-generator(20), and a motor control unit(40). The motor-generator(20) is connected to the engine(10) and drives the engine(10) by one of a motor mode and a generator mode. The motor control unit(40) reduces an RPM of the engine(10) by controlling output current provided to the motor-generator(20) when the engine(10) is stopped. A ratio of the motor-generator(20) to a full crank pulley is 1:2-3. When the engine is stopped, an initial RPM of the motor-generator(20) is 2240-2800, and an initial RPM of the engine(10) is 800-1000. The motor-generator(20) is switched from the generator mode to the motor mode when the engine(10) is stopped.