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SAE 2014 World Congress and Exhibition

作者： Sun, Shaohua Lei, Yulong Li, Xingzhong State Key Lab of Automotive Simulation Control Jilin Univ China

Drag torque in multi-plate wet clutch consumes engine energy, but also has significant affect on synchronization process during shifting. The mathematical models of drag torque and shift synchronization process were established, and the results carried out by Matlab/Simulink simulation were compared with experiment results as well. It is demonstrated that the models are correct and accurate. The influences of friction pair gap in multi-plate wet clutch, cooling oil flow and properties of cooling oil under different temperature etc. on drag torque, shift synchronization time and energy were analyzed. The conclusions have certain guiding significance to the multi-plate wet clutch theoretical study and structural design as well as transmission system matching. Copyright © 2014 SAE International.

关键词： MATlab

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Research on intelligent self-learning system for the electro-pneumatic automated manual transmission gear position

Research on intelligent self-learning system for the electro...

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SAE 2014 World Congress and Exhibition

作者： Sun, Shaohua Li, Shunbo Fu, Yao Yang, Cheng State Key Lab of Automotive Simulation Control Jilin Univ China

In the electro-pneumatic automated mechanical transmission (AMT) system, the manufacturing, assembly, wear, replacement and other issues often lead to gear position change and some differences in various gears of transmission, which reduces the success rate and even results in abnormally working. To solve these problems, based on the intelligent control theories of fuzzy PI control, this research developed an intelligent self-learning system for the AMT gear position. This system contains the position initialization module after assembling (offline module) and the position correction module in use (online module). The system can automatically recognize gear position deviation and actively correct it, which improves the robustness of shift actuator. The precise control of shift actuator is the key of this self-learning system. However, due to the compressibility of air and uncertainty of external flexible dynamics, it is difficult to establish accurate models of the system in each stage, so conventional PID control methods have been unable to accurately control the position of shift cylinder. In this study, the flow equation of shift valve is established based on analysis of the operating principles of electronically controlled pneumatic AMT, and then a fuzzy PI control strategy is developed according to fuzzy control theory. With the platform of pure electric car equipped electrically controlled pneumatic AMT, a series of field vehicle tests were carried out and the results showed that the development of intelligent AMT shift position self-learning system can effectively achieve self-learning of shift position accurately with good consistency and higher efficiency. Copyright © 2014 SAE International.

关键词： Fuzzy control

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Development of active control strategy for flat tire vehicles

Development of active control strategy for flat tire vehicle...

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SAE 2014 World Congress and Exhibition

作者： Liu, Haizhen Deng, Weiwen Zong, Changfu Wu, Jian State Key Lab of Automotive Simulation and Control Jilin Univ China

This paper first presents an algorithm to detect tire blowout based on wheel speed sensor signals, which either reduces the cost for a TPMS or provides a backup in case it fails, and a tire blowout model considering different tire pressure is also built based on the UniTire model. The vehicle dynamic model uses commercial software CarSim. After detecting tire blowout, the active braking control, based on a 2DOF reference model, determines an optimal correcting yaw moment and the braking forces that slow down and stop the vehicle, based on a linear quadratic regulator. Then the braking force commands are further translated into target pressure command for each wheel cylinder to ensure the target braking forces are generated. Some simulations are conducted to verify the active control strategy. From the simulation results, it is shown that this active brake control strategy can not only ensure the flat tire vehicle stability, but also slow down the vehicle with a safe speed and for a shorter distance. Copyright © 2014 SAE International.

关键词： Tires

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Accelerating exploitation and integration of global renewable energy

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Innovation 2025年

作者： Wang, Jianxiao Chen, Xinjiang Zhuang, Minghao Li, Yan Ruan, Ziwen Wang, Yuhan Zhang, Ning Song, Jie He, Kebin Lu, Xi National Engineering Laboratory for Big Data Analysis and Applications Peking University Beijing100871 China Department of Industrial Engineering and Management College of Engineering Peking University Beijing100871 China Peking University Ordos Research Institute of Energy Ordos017000 China State Key Laboratory of Nutrient Use and Management College of Resources and Environmental Sciences China Agricultural University Beijing100193 China College of Environmental Science and Engineering Tongji University Shanghai200092 China School of Environment State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua University Beijing100084 China State Key Lab of Power Systems Department of Electrical Engineering Tsinghua University Beijing100084 China Institute for Carbon Neutrality Tsinghua University Beijing100084 China

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Coach Simplified Structure Modeling and Optimization Study Based on the PBM Method

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Chinese Journal of Mechanical Engineering 2016年第5期29卷 1010-1018页

作者： ZHANG Miaoli REN Jindong YIN Ying DU Jian State Key Lab of Automotive Simulation and Control Jilin University Hyundai Motor Technology & Engineering Center (China) Ltd. R&D Center FAW Group

For the coach industry, rapid modeling and efficient optimization methods are desirable for structure modeling and optimization based on simplified structures, especially for use early in the concept phase and with capabilities of accurately expressing the mechanical properties of structure and with flexible section forms. However, the present dimension-based methods cannot easily meet these requirements. To achieve these goals, the property-based modeling （PBM） beam modeling method is studied based on the PBM theory and in conjunction with the characteristics of coach structure of taking beam as the main component. For a beam component of concrete length, its mechanical characteristics are primarily affected by the section properties. Four section parameters are adopted to describe the mechanical properties of a beam, including the section area, the principal moments of inertia about the two principal axles, and the torsion constant of the section. Based on the equivalent stiffness strategy, expressions for the above section parameters are derived, and the PBM beam element is implemented in HyperMesh software. A case is realized using this method, in which the structure of a passenger coach is simplified. The model precision is validated by comparing the basic performance of the total structure with that of the original structure, including the bending and torsion stiffness and the first-order bending and torsional modal frequencies. Sensitivity analysis is conducted to choose design variables. The optimal Latin hypercube experiment design is adopted to sample the test points, and polynomial response surfaces are used to fit these points. To improve the bending and torsion stiffness and the first-order torsional frequency and taking the allowable maximum stresses of the braking and left turning conditions as constraints, the multi-objective optimization of the structure is conducted using the NSGA-II genetic algorithm on the ISIGHT platform. The result of the Paret

关键词： coach structure property-based modeling (PBM) simplification modeling multi-objective optimization

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The target vehicle movement state estimation method with radar based on kalman filtering algorithm

The target vehicle movement state estimation method with rad...

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2013 International Conference on Precision Mechanical Instruments and Measurement Technology, ICPMIMT 2013

作者： Jia, Xin Wu, Zuo Long Guan, Hsin State Key Lab of Automobile Simulation and Control Jilin University Changchun China

ISBN: (纸本)9781629933405

In this paper, based on Kalman filtering algorithm, a method of target vehicle motion state radar estimation with radar(or lidar) is presented. The state equations is established based on rigid plane dynamics theory, and then with a Kalman filter to do radar data processing, the position, velocity and acceleration of the target vehicle can be estimated at the same time, so that to cover the shortage that acceleration information can not be gained with radar system. Through simulation and field tests it is verified that the detection accuracy of position and velocity of target vehicle is increasing, and the acceleration of target vehicle can be estimated effectively and accurately. © 2013 Trans Tech Publications Ltd, Switzerland.

关键词： Kalman filters

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Influence of engine cabin simplification on aerodynamic characteristics of car 3

Influence of engine cabin simplification on aerodynamic char...

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3rd International Conference on key Engineering Materials and Computer Science, KEMCS 2014

作者： Hu, Xing Jun Chang, Jing State Key Lab of Automobile Simulation and Control Jilin University Changchun China

ISBN: (纸本)9783038352846

In order to analyze the impact of engine cabin parts on aerodynamic characteristics, the related parts are divided into three categories except the engine cooling components: front thin plates (average thickness of 2mm), bottom-suspension and interior panels. The aerodynamic drag coefficient(Cd) were obtained upon the combination schemes consisting of the three types of parts by numerical simulation. Results show that Cd by simulation is closer to the test value gained by the wind tunnel experiment when front thin plates were simplified to the two-dimensional interface with zero thickness. The error is only 5.23%. Meanwhile this scheme reduces grid numbers, thus decreasing the calculating time. As the front thin plates can guide the flow, there is no difference on the Cd values gained from the model with or without bottom-suspension or interior panels when the engine cabin contains the front thin plates;while only both bottom-suspension and interior panels are removed, the Cd value can be reduced when the cabin doesn't contain the front thin plates. © (2014) Trans Tech Publications, Switzerland.

关键词： Suspensions (fluids)

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Fuzzy Supervisory Based Variable Frequency control Strategy for Active Battery/Supercapacitor Combination in Electric Vehicles

Fuzzy Supervisory Based Variable Frequency Control Strategy ...

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SAE 2016 World Congress and Exhibition

作者： Qiao, Zhang Deng, Weiwen Wu, Jian Ju, Feng Li, Jingshan Jilin University State Key Lab of Automotive Simulation and Control 130025 China

This paper describes a novel power management control strategy of battery and supercapacitor hybrid energy storage system to improve system efficiency and battery lifetime. In the presented research, the high and low frequency power demand in the load is separated by a Haar wavelet transform algorithm to overcome the problem of battery overload work and associated degeneration in battery lifetime resulting from an ineffective distribution between battery and supercapacitor. The purpose of frequency distribution is that the supercapacitor is used to share high frequency power components of load power demand to smooth the power demand applied to battery. However, the sole frequency control often fails to realize the optimal utilization of supercapacitor because of the uncertain variation in the driving cycle. Therefore, the power demand distributed to supercapacitor is designed to be changeable along with the variation of its voltage, which is another important advantage of the proposed control strategy. The idea is to utilize different decomposition levels of wavelet transform algorithm, which is adjusted by using a fuzzy-logic controller to reduce the adverse influence of both high frequency transition and peak power from the load power demand on battery system. Finally, simulation is conducted to verify the effectiveness of the proposed strategy. © Copyright 2016 SAE International.

关键词： Supercapacitor

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Shift quality improvement through integrated control of dual clutches pressure and engine speed for DCT

Shift quality improvement through integrated control of dual...

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SAE 2014 World Congress and Exhibition

作者： Yin, Xiaofeng Zhong, Yuan Wu, Xiaohua Lu, Han State Key Lab of Automotive Simulation and Control China Xihua University China

The clutch-to-clutch gear-shift process of dual clutch transmission (DCT), which consists of the overlapping of the engagement of the incoming clutch and the disengagement of the outgoing clutch, is a vital stage for the shift quality improvement. The paper investigated an integrated control strategy for the gear-shift process that takes into account the influences of oil pressure of dual clutches and engine speed on shift quality. Firstly, the evaluation indices for the shift quality of DCT were summarized, and the factors affecting the shift quality were analyzed. Secondly, an integrated control strategy for dual clutches pressure and engine speed was proposed. Through analyzing the states of clutch in the gear-shift process and the desired traction torque for different gears, the strategies of variable oil pressure and invariable oil pressure were determined for every gear-shift process. Furthermore, a PID controller for engine speed and a fuzzy controller for clutch pressure were developed respectively. Finally, the simulation model for the gear-shift process of a wet-type DCT was built, and taking the shift jerk and the friction work as evaluation indices for the shift quality, the variable pressure strategy has been compared with the invariable pressure strategy via simulation experiments. simulation results show that the fuzzy controller can make the actual clutch pressure trace the target pressure precisely in the gear-shift process and both the shift jerk and the friction work produced with the variable pressure strategy are less than those produced with the invariable pressure strategy for all up- and downshift processes of DCT. Copyright © 2014 SAE International.

关键词： Clutches

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A vision recognition method of wheel's pose and position parameters in bench testing

A vision recognition method of wheel's pose and position par...

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2nd International Conference on Mechanical Engineering, Industrial Electronics and Informatization, MEIEI 2013

作者： Jia, Xin Guan, Hsin State Key Lab of Automobile Simulation and Control Jilin University Changchun 130025 China

ISBN: (纸本)9783037858905

IA method is proposed here to recognize wheel's pose and position parameters with computer vision aiming to the need of measuring wheel moving track in suspension bench testing. Firstly, several markers are fit on the target wheel manually. Secondly, image coordinates of character points is calculated with image processing method and least square ellipse fitting algorithm. At last, wheel's pose and position parameters are calculated with rigid body motion POSIT algorithm, and then wheel moving track is measured in test. The algorithm of wheel's pose and position parameters in bench testing based on the computer vision here will supply the base under the realization of the moving wheel's pose and position parameters recognizing in real time. © (2013) Trans Tech Publications, Switzerland.

关键词： Computer vision

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