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송찬혁(Chanhyuk Song),이희란(Heera Lee),김달철(Tachol Kim),김철수(Chulsoo Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.5_2
Dynamic characteristics of the ratio control system and line pressure control system are investigated in order to develop the control algorithm for a parallel HEV CVT . It is found that the line pressure is controlled in two ways, as high and low pressure, depending on the PWM solenoid on-off characteristics, which requires an electronic control of the line pressure corresponding to the engine and motor torque. CVT ratio can be controlled by varying stepping motor rod displacement. Simulation results show that the optimal engine operation can be achieved for the HEV by closed control of the stepping motor displacement.<br/>