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조희영(Hee Young Jo) 유공압건설기계학회 2016 드라이브·컨트롤 Vol.13 No.1
e-4WD(Electric-4WD) system is a 4WD(4-Wheel Drive) System that can transform a car into a Hybrid System. e-4WD consists of a Motor, Inverter, Speed reducer and Clutch. The Motor, Speed reducer and Clutch are installed on the rear sub-frame as a chassis module type. The inverter is installed separately. Compared to a mechanical 4WD, the e-4WD system has many advantages. For example, the reduced number of drivetrain components makes better use of the space. Driving with a motor only at low speed improves fuel economy and reduces exhaust gas. Engine downsizing is available because the motor assists the engine. The performance of a conventional HEV(Hybrid Electric Vehicle) system can also be maintained. This paper proposes the specifications of components and the control logic for an e-4WD System. And the effect of the e-4WD system is proven using a test vehicle equipped with components under various test conditions.
염명기(Myungki Yeom),조희영(Hee Young Jo),이정진(Jeong Jin Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Despite the importance of tire force in chassis control factor, it was not directly measured the real-time tire force in current chassis control system. However, it can be directly measured the real-time tire force in the intelligent tire system or the wheel hub tire force sensor under developing recently. In this paper, to improve the vehicle performance and stabilization, it’ll be suggested a new concept of 4WD control method using directly-measured tire force. This control system includes a control concept standardizing the load rate that signifies critical situations in tires, also includes a yaw moment control. This control system was confirmed by dynamic simulations and vehicle tests on the proving ground.