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ENERGY MANAGEMENT AND DESIGN OPTIMIZATION FOR A SERIES-PARALLEL PHEV CITY BUS
Yuanchun Cai,Minggao Ouyang,Fuyuan Yang 한국자동차공학회 2017 International journal of automotive technology Vol.18 No.3
Series-parallel PHEV city buses combine the advantages of series and parallel configurations and have been used in China. However, the design and energy management of series-parallel PHEV city buses based on Chinese driving conditions still need to be investigated. In this paper, an equivalent consumption minimization strategy is provided to optimize energy management for series-parallel PHEV city buses, and the process of the equivalent consumption minimization strategy for series-parallel is presented in this paper. Compared with the validated rule-based energy control strategy, ECMS shows a fuel economy improvement of 8.2 % in the CBCD (Chinese Bus Driving Cycle). Based on the optimal energy management, a design for a generator motor in the series-parallel configuration has been processed. The fuel consumption has been shown to decrease, with an increase in generator power, because the system with the higher generator power can work at a higher efficiency in the series mode and operate the engine in the high efficiency area in the parallel mode. Besides, in terms of costof- ownership for a PHEV bus for lifetime of 8 years, although the high generator power will lead to high purchase cost for series-parallel PHEV bus, a series-parallel PHEV city bus with a generator of 100 kW maximum power will still show small advantage in cost-of-ownership, based on current motor price and natural gas price.
Nonlinear Observer-based Torque Control for SI Engine
Munan Hong,Tielong Shen,Minggao Ouyang 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper, a nonlinear torque observer for Spark Ignition(SI) engine is proposed and a torque control method based on the observer is presented. In the observer, a torque production model is employed to give the nominal value of torque estimation. Then, using the rotational dynamice quation of the crank shaft, a nonlinear adjusting law is added to correct the nominal estimation. The proposed observer isused to realize closed loop torque control, where the torque demand is given by solving an optimal speed tracking problem. To demon strate the observer and torque controller, experimental results are shown finally.