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2022 8th International Conference on Mechanical Engineering, Materials and Automation Technology, MMEAT 2022

作者： Shen, Chuanliang Yue, Yubing Hu, Yibo Yu, Jing State Key Laboratory of Automotive Simulation and Control Jilin University Changchun China

This paper introduces several commonly used constitutive models of SMA materials, expounds the relationship between material temperature, stress and strain from the perspective of one-dimensional model, and establishes the simulation model of reciprocating motion of SMA actuator based on the material parameters obtained from quasi-static mechanical property experiments in the previous paper. A double wire pull SMA actuator is designed and a prototype is made. The output displacement data obtained from the experiment is compared with the established simulation model to prove the accuracy of the simulation process. © Published under licence by IOP Publishing Ltd.

关键词： Linear actuators

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Aerodynamic Performance of Two-Vehicle Platooning of DrivAer Model 6th

Aerodynamic Performance of Two-Vehicle Platooning of DrivAer...

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6th Symposium on Fluid-Structure-Sound Interactions and control, FSSIC 2023

作者： Li, Jinji Tong, Zhongqing Zhang, Yingchao Chen, Tao State Key Laboratory of Automotive Simulation and Control Jilin University Changchun130022 China FAW Jiefang Commercial Vehicle Development Institute Changchun130013 China

ISBN: (纸本)9789819762101

With the gradual maturity of intelligent driving technology, driving in platoon is easy to achieve, which might benefit for energy saving. Hence, it is urgent to discover the mechanism of aerodynamic in platoon condition. Aerodynamic drag and mechanism in two-vehicle platooning in different spacing are studied by numerical method with the DrivAer model. As spacing grows, three configuration models share the same law, but the leading and trailing car appear the opposite drag change compared with that in the isolated condition. Pressure changes of some crucial parts and wake field are analyzed in detail. Some new styles of vehicle shape might be needed for driving in platoon. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Aerodynamic drag

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Requirements Decomposition for Perception Systems of Autonomous Vehicles: A Case Study of Multi-Object Tracking 27

Requirements Decomposition for Perception Systems of Autonom...

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27th IEEE International Conference on Intelligent Transportation Systems, ITSC 2024

作者： Yu, Ruilin Wang, Cheng Lv, Zhouhang Zhang, Yuxin Jilin University State Key Laboratory of Automotive Simulation and Control Changchun China School of Engineering and Physical Sciences Heriot-Watt University Edinburgh United Kingdom

ISBN: (纸本)9798331505929

Safety requirements decomposition is critical to ensure a safe autonomous vehicle (AV) by design despite the importance of safety verification and validation. This study proposes a method called QUASARS (QUAntifying SAfety Requirements using Shapley) for efficiently decomposing AV perception safety requirements into component-level and effectively quantifying them. QUASARS models the quantification of the impact of component-level faults on system-level faults as a feature importance calculation problem. We demonstrated QUASARS using a multi-object tracking system as an example and validated component-level safety requirements 100 times on the test set. After meeting the generated component-level safety requirements, the testing system was able to meet the system-level safety requirements, indicating the effectiveness of this method in decomposing system-level safety requirements into component-level. © 2024 IEEE.

关键词： autonomous vehicles Quantitative Requirements Risk Decomposition Shapely Value SOTIF

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control of Vehicle Beyond the Stability Limits 5

Control of Vehicle Beyond the Stability Limits

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5th IEEE International Conference on Automation, Electronics and Electrical Engineering, AUTEEE 2022

作者： Wang, Pengyu Ji, Yipei Jilin University State Key Laboratory of Automotive Simulation and Control Changchun China

ISBN: (纸本)9781665471978

A trajectory tracking controller of a drifting vehicle is developed in this paper. To accurately achieve path tracking, a control law is derived from expert driver. The synthetic vehicle course angle and yaw rate is derived. A front tire simplifying assumption and wheel-speed control at rear tires is adopted in the controller. simulation demonstrates good tracking of a trajectory with varying curvature. © 2022 IEEE.

关键词： Autonomous vehicles

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Shift schedule design of thirty-two-speed binary logic transmission based on man-vehicle-road System 6

Shift schedule design of thirty-two-speed binary logic trans...

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6th CAA International Conference on Vehicular control and Intelligence, CVCI 2022

作者： Zhou, Lanqi Zeng, Xiaohua Liang, Weizhi Yang, Dongpo Song, Dafeng Jilin University State Key Laboratory of Automotive Simulation and Control Changchun China

ISBN: (数字)9781665453745

ISBN: (纸本)9781665453745

Binary logic transmission (BLT) is an emerging automatic transmission. Because of its high transmission efficiency, high power density, strong load capacity and compact structure, it has been widely used in military vehicles and other special vehicles in recent years. The traditional shift schedules will lead to frequent shifts of the thirty-two-speed BLT and cumbersome solutions for the jump points. Therefore, referring to the speed ratio adjustment strategy of the continuously variable transmission, the paper proposes a dynamic speed ratio adjustment strategy and an economic speed ratio adjustment strategy suitable for the thirty-two-speed BLT, which can ensure the power and economy of vehicle and achieve reasonable gear jumping. At the same time, considering the influence of different road conditions on the shift schedule, the paper introduces the road gradient and vehicle mass to modify the above shift schedule, and designs a thirty-two-speed BLT shift schedule based on the man-vehicle-road system. Based on the physical simulation platform of thirty-two-speed BLT, the proposed shift schedule is simulated and verified. The results show that the shift schedule can meet the demand of vehicle power performance and economic performance, solve the problem of frequent shifts, and significantly enhance the vehicle climbing performance, give full play to the backup power of the vehicle, and effectively improve the working condition adaptability of the thirty-two-speed BLT. © 2022 IEEE.

关键词： Roads and streets

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Driving characteristics of shape memory alloy wires under different loads

Driving characteristics of shape memory alloy wires under di...

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2022 International Conference on Optoelectronic Information and Functional Materials, OIFM 2022

作者： Shen, Chuanliang Yu, Jing Xu, Xiaodong Zheng, Chengfeng Li, Shengnan State Key Laboratory of Automotive Simulation and Control Jilin University Changchun China

ISBN: (数字)9781510655126

ISBN: (纸本)9781510655119

The driving characteristics of SMA actuators mainly include the range, force and speed of the actuator, and these driving characteristics are determined by the alloy composition and use conditions. The alloy composition and service conditions affect the stress, strain and phase transformation speed of the SMA wire during the phase transformation, and affect the driving characteristics of the SMA wire. Using the shape memory alloy seat drive element with one-way shape memory effect, two-way drive can be realized under the action of bias force. The driving characteristics of alloy wires under the action of different constant loads and bias springs with different stiffness, including the influence laws of driving displacement, driving force and response time. © 2022 SPIE.

关键词： Phase transitions

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An Integrated GNSS/INS/DR Positioning Strategy Considering Nonholonomic Constraints for Intelligent Vehicle 6

An Integrated GNSS/INS/DR Positioning Strategy Considering N...

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6th CAA International Conference on Vehicular control and Intelligence, CVCI 2022

作者： Chen, Guo-Ying Wang, Jia-Qi Hu, Hong-Yu Jilin University State Key Laboratory of Automotive Simulation and Control Changchun China

ISBN: (数字)9781665453745

ISBN: (纸本)9781665453745

The realization of decision-making, trajectory planning, and motion control of intelligent vehicles highly depends on the precise and continuous position information. To provide reliable pose information during GNSS (Global Navigation Satellite Systems)outage, an integrated position strategy based on the GNSS, INS (Inertial Navigation System), DR (dead reckoning) considering nonholonomic constraints (NHC) was proposed in this paper. First, a positioning algorithm of GNSS/INS was established using an Error state Kalman Filer (ESKF). Nonholonomic constraints and vehicle speed were used to correct the navigation error to improve positioning accuracy. Then, the available time of the algorithm during GNSS signal outage was further extended by designing a DR system based on vehicle dynamics. An Extended Kalman Filter (EKF) was used to process the nonlinear system and the information of wheel speed and front wheel angle were integrated into the system. Finally, the fusion positioning algorithm was validated by NI HIL platform. The results showed that, during GNSS outage, the positioning strategy proposed in this paper could reduce the root means square errors (RMSE) of positioning accuracy, compared to the GNSS/INS positioning algorithm, by 78.2% along x-axis and 83.0% along y-axis. © 2022 IEEE.

关键词： Inertial navigation systems

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Research on Integrated Thermal Management System Test Technology of Electric Vehicle 9

Research on Integrated Thermal Management System Test Techno...

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9th International Conference on Mechanical Engineering, Materials, and Automation Technology, MMEAT 2023

作者： Fu, Yu Li, Zeyu Wang, Fang State Key Laboratory of Automotive Simulation and Control Changchun130022 China Co. Ltd. Tianjin300300 China

ISBN: (纸本)9781510668584

The development of integrated thermal management system for the improvement of environmental adaptability and comprehensive energy efficiency of new generation electric vehicles has become the development trend of the industry, but its coupling between systems is strong and development is difficult, so it needs system integration test to assist development. The integrated test technology of thermal management system is reviewed from the characteristics of integrated thermal management system, the research status of system integration test technology and the technical conditions of bench test. Focusing on meeting the technical requirements of real vehicle scenario in bench test environment and customization of test conditions, this paper analyzes in detail the research progress and technical application of key technologies such as the real-time calculation method of system simulation of real vehicle operation air intake and the accurate control of transient air supply and temperature stability control under low speed condition, puts forward the current problems of system integration test and predicts the development direction. © 2023 SPIE.

关键词： Energy efficiency

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Rational adjustment to interfacial interaction with carbonized polymer dots enabling efficient large-area perovskite light-emitting diodes

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Light(Science & Applications) 2023年第6期12卷 1029-1039页

作者： Fan Yang Qingsen Zeng Wei Dong Chunyuan Kang Zexing Qu Yue Zhao Haotong Wei Weitao Zheng Xiaoyu Zhang Bai Yang State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China Department of Materials Science Key Laboratory of Mobile Materials MOEState Key Laboratory of Automotive Simulation and ControlJilin UniversityChangchun 130012China Institute of Theoretical Chemistry and Laboratory of Theoretical&Computational Chemistry Jilin UniversityChangchun 130023China

Film uniformity of solution-processed layers is the cornerstone of large-area perovskite light-emitting diodes,which is often determined by the‘coffee-ring effect’.Here we demonstrate a second factor that cannot be ignored is the solid-liquid interface interaction between substrate and precursor and can be optimized to eliminate rings.A perovskite film with rings can be formed when cations dominate the solid-liquid interface interaction;whereas smooth and homogeneous perovskite emitting layers are generated when anions and anion groups dominate the *** is due to the fact that the type of ions anchored to the substrate can determine how the subsequent film *** interfacial interaction is adjusted using carbonized polymer dots,who also orient the perovskite crystals and passivate their buried traps,enabling a 225 mm^(2) large-area perovskite light-emitting diode with a high efficiency of 20.2%.

关键词： interaction perovskite interaction

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Charging management and pricing strategy of electric vehicle charging station based on mean field game theory

Charging management and pricing strategy of electric vehicle...

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作者： Lin, Runzi Chu, Hongqing Gao, Jinwu Chen, Hong State Key Laboratory of Automotive Simulation and Control Department of Control Science Jilin University Campus NanLing Changchun China School of Automotive Studies Tongji University Shanghai China College of Electronics and Information Engineering Tongji University Shanghai China

As an intermediary between the power grid and the electric vehicles (EVs) in the charging station, the charging pile promotes the exchange of electric energy between the power grid and EV group and also brings benefits to the charging station. It is difficult to accurately analyze the detailed energy trading behavior of a large number of charging piles with the power grid and EV group. Based on the theoretical framework of mean field game (MFG), this paper considers the battery degradation and charging efficiency taking into account the charging demand of EVs, the charging control problem of energy storage charging piles is proposed to achieve the goal of minimizing the cost of the charging station. In addition to modeling the interaction between the charging station and power grid and EVs as a finite-time dynamic game problem, optimal decentralized energy scheduling control strategies are formulated for charging piles, and by introducing the mean field term, the optimal pricing strategy for power trading between the charging station and EVs is obtained under the mean field equilibrium condition. An iterative algorithm is proposed to solve the charging control problem, and the rationality of the problem and the effectiveness of the algorithm are verified by numerical simulation. © 2023 Chinese Automatic control Society and John Wiley & Sons Australia, Ltd.

关键词： Piles

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