다양한 도로조건에 대한 하이브리드 SUV의 운전모드 제어

Abstract

최근 세계각국에서 environmental pollution과 depletion of fossil fuels에 대한 관심이 높아지고 있다. 그에 따라서 vehicle industry에 대해서도 exhaust control 과 fuel efficiency의 대폭적인 개선이 요구되고 있으며, 이를 만족하기 위해 EV (electric vehicle), HEV (hybrid electric vehicle), FCEV (fuel cell electric vehicle) 등에 대한 연구가 이루어지고 있다. 본 연구에서는 hybrid SUV (sports utility vehicle)의 power flow를 power plant의 종류에 따라 13 types engine mode, 14 types motor mode, 9 types hybrid mode, 5 types regenerate braking mode로 분류하였고, bond graph를 이용하여 equation of motion를 유도하였다. 유도된 equation of motion을 바탕으로 engine, electric motor, CVT (continuously variable transmission), PGS (planetary gear system), battery, drive axle에 대한 modules를 개발하였고, 개발된 modules와 operating mode control algorithm을 바탕으로 HEVSIM (hybrid electric vehicle simulator)을 개발하였다. HEVSIM을 이용하여 6가지 driving schedule (US06HW, HEFET, UDDS, Japanese 1015, US06, 0-200)에 대하여 driving performance를 비교 평가하였다. Simulation 결과, target vehicle의 fuel efficiency가 existing vehicle보다 highway driving type인 US06HW driving schedule에서 47.7%, HWFET driving schedule에서 27.7 % 향상된 result를 얻었고, city driving type인 UDDS driving schedule에서 17.6 %, Japanese 1015 driving schedule에서 16.9 % 향상된 result를 얻었다. 마지막으로 highway driving type과 city driving type이 혼합된 US06 driving schedule에서 31.7 % 향상된 result를 얻었다.; The improvement of exhaust control and fuel efficiency is requested due to the environment pollution and depletion of fossil fuels. This forces the vehicle industry to develop the EV (electric vehicle), HEV (hybrid electric vehicle) and FCEV (fuel cell electric vehicle). In this study, the power flow of hybrid SUV (sports utility vehicle) is classified to the 13 types of engine modes, 14 types of motor modes, 9 types of hybrid modes and 5 types of regenerative braking modes according to power plant’s resources. The corresponding equations of motion are derived using the bond-graph method. On basis of the derived equations of motion, the modules of engine, electric motor, CVT (continuously variable transmission), PGS (planetary gear system), battery and drive axle are developed. The HEVSIM (hybrid electric vehicle simulator) is developed based on these modules and operating mode algorithms. The 6 driving schedules are used to conduct the driving performance and compared with the ones of existing vehicles. The simulation results show that the fuel efficiency of the target vehicle is improved by 47.7% compared to the one of the conventional vehicle under US06HW driving schedule which is the highway driving type, 27.7% under HWFET driving schedule which is the highway driving type, 17.6% under UDDS driving schedule which is the city driving type, 16.9% under Japanese 1015 driving schedule which is the city driving type, 31.7% US06 driving schedule which are the highway and city driving types.