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ENGINE INDICATED TORQUE ESTIMATION OF A NATURALLY ASPIRED GASOLINE ENGINE
박진락,최세범,오지원,어정수 한국자동차공학회 2020 International journal of automotive technology Vol.21 No.5
The information of clutch transmitted torque is needed when controlling a clutch in a vehicle powertrain. However, engine indicated torque is a very important variable when estimating the clutch torque. The engine indicated torque is generally estimated as a function of engine rotational speed and the mass flow rate of air from an intake manifold into cylinders, which is referred as port air mass flow. The port air mass flow cannot be measured but should be estimated in a real vehicle. In previous studies, the port air mass flow was estimated using the information of the mass flow rate of air into the intake manifold through a throttle plate, which is referred as throttle air mass flow, and the information of air pressure in the intake manifold together. However, this study proposes a new estimation method of the port air mass flow using only the information of the throttle air mass flow. In addition, the engine indicated torque is estimated using the estimated port air mass flow and compared with the measured value. The estimation method of the port air mass flow and engine indicated torque, presented in this study, is verified with production engine experiments.
주행모드 및 운전자, 환경변수에 따른 SOC, EV/HEV 가변제어
김정은(Jeongeun Kim),오종한(Jonghan Oh),어정수(Jeongsu Eo) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Recently, in accordance with the increased interest of consumer in fuel efficiency due to the phenomenon of high oil price, complaints against actual fuel efficiency in the road in comparison with the certified fuel efficiency have been raised frequently. Especially in case of the hybrid vehicle which is highly popular for the reason of its high fuel efficiency compared with that of existing gasoline car, deviation in the fuel efficiency will be higher compared with that of gasoline car in accordance with the driving mode (downtown/highway), propensity of driver (wild/mild) and external environmental condition (gradient/temperature/altitude). To solve them, this paper developed a method so that the SOC (state of charge), EV/HEV transition point can be controlled variably in accordance with the driving mode, propensity of driver and external environmental condition by making the most of characteristics of hybrid. Through it, efficient engine operating point could be secured even in the driving situation under severe condition while maintaining a fixed SOC value, and it was verified that there are effects of increases in the average fuel efficiency and reduction of deviation in the fuel efficiency (about 2.5 kpl, 10~20%) through HILS (hardware-in-the-loop-simulation) validation. Application of this developed logic to 12 MY YF/TF hybrid vehicles has been completed.
Model Based Design를 이용한 HCU 수행시간 진단에 관한 연구
김형석(Hyung Suk Kim),윤석영(Seok Young Yun),이명원(Myung Won Lee),어정수(Jeong Soo Eo) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Hybrid control unit(HCU) should maintain the high reliability why it controls the hybrid electrical vehicle(HEV) by ordering the lower controllers like ECU, MCU, TCU etc. If HCU is out of order, it demands on the method for guaranteeing the safety of car and human, so I think that HCU needs to have the high reliability and prevent disorder. This paper proposes the process for improving reliability how HCU checks the execution time decided by System Dynamic. In order to normally carry out an operation and control the system, the firmware and application software should be executed in that time. From the monitoring concept, I have developed the diagnosis control logic using Model-based design(MBD) and generated the HCU code by the Code Generation and compiler for checking the execution time.