Abstract
The Mild Hybrid has been mass-produced. It is equipped Motor-Generator in the vehicle, and is realized fuel efficiency improvement by deceleration energy recovery and Engine Assist.
In our laboratory, the Mild Hybrid system using an Alternator has been proposed. An alternator is automotive generator; it charges Battery and supplies power for electric component in the vehicle. Electric structure of an alternator is equivalent to a motor; therefore an alternator is able to control as Motor-Generator using Motor Driver Unit. In order to construct generic Mild Hybrid system, Authors conduct a study by installing proposed system to medium sized vehicle. For improvement of fuel efficiency, Assist-area is extended using higher battery voltage than that of general Mild Hybrid. And deceleration energy recovery is performed using Vector control. In proposed system, the alternator is controlled by using accelerator and Brake signal to assist the engine during acceleration, regenerate energy during deceleration, and otherwise charge the battery on constant voltage.
In this paper, authors report effectiveness of proposed system by simulation using M-G set and vehicle running test.
