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Mingming Qiu,Lei Wang,Xiaoyu Mu,Wei Yu,Kang Huang 한국자동차공학회 2024 International journal of automotive technology Vol.25 No.2
The energy effi ciency of intelligent networked connected electric vehicle (EV) is directly related to its velocity. Aiming atthe infl uence of real-time traffi c fl ow information on road speed interval, a two-layer speed planning method is proposed. The upper layer extracts the road speed interval according to the traffi c fl ow information, and based on cellular automata andconfi dence interval theory, traffi c information rules are introduced, and a road speed interval extraction method consideringtraffi c density information is established. The lower layer is used to obtain energy-optimal cruising velocity profi le. Takingthe road speed interval as the variable boundary constraint, a dynamic programming algorithm that changes the state quantityboundary in real time is designed, which realizes the effi cient acquisition of the energy-optimized velocity trajectory. To verify the eff ectiveness of proposed approach, the simulation model is formulated based on using collected real traffi cinformation. The simulation results demonstrate that, compared with the conventional constant speed cruising strategy anddynamic programming (DP) strategy based on road speed interval, the strategy proposed in this study not only improvesenergy effi ciency and reduces computing time signifi cantly, but also can predict the traffi c conditions ahead to avoid largefl uctuations in velocity. Besides, the biggest signifi cance of this study is the designed economic velocity planning algorithmbased on real-time traffi c density information improves the adaptability of intelligent networked connected EV controlstrategy to actual traffi c conditions, and extends the optimization dimension of eco-driving.
MODEL-BASED CONTROL OF SYNCHRONIZER SHIFTING PROCESS FOR TRAJECTORY TRACKING CONTROL
Yan Zhang,Han Zhao,Mingming Qiu,Feifei Qin,Bingzhan Zhang 한국자동차공학회 2020 International journal of automotive technology Vol.21 No.4
A novel approach of the tracking control for synchronizer displacement is introduced in this paper. Based on modeling for the structure of synchronizer and shifting process, a shifting displacement tracking controller is designed by the Udwadia - Kalaba equation. The engagement rule of synchronizer combination sleeve is regarded as the trajectory constraint of the system, certain constraint force is imposed to follow this trajectory constraint, which could be obtained by the Udwadia- Kalaba equation without using Lagrange multiplier or other auxiliary variables. Specific comparative study with conventional PID control is discussed. Simulations and vehicle test results show that the shifting actuator can accurately track the desired trajectory determined by the upper layer control strategy, thus verify the effectiveness of the controller.
Transdermal Pain Palliative Agents Containing Chinese Medicinal Herbs
Jia, Wei,Gao, Wenyuan,Cui, Naiqiang,Tang, Lida,Liu, Victoria J.K.,Yang, Jianqin,Qiu, Yunpin,Su, Mingming,Yu, Xiaojia The Korean Society of Plant Biotechnology 2003 Plant molecular biology and biotechnology research Vol.5 No.1
The TCM (traditional Chinese medicine) transdermal plaster (also known as "cataplasma") are flexible adhesive patches used for treatment of any pain, resulted from arthritis, sprain and bruise, tendovaginitis, lumbar spine protrude, neuralgia, hyperosteogeny ache, abdominal discomfort and metastatic cancer, etc. This paper provides a review of the TCM transdermal agents for pain palliation and the preparation of these herbal patches.l patches.