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Zhou X.X.,University of Technology, Sydney | Walker P.D.,University of Technology, Sydney | Zhang N.,University of Technology, Sydney | Zhu B.,Beijing Electrical Vehicle Co. | Ding F.,University of Technology, Sydney
ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) | Year: 2012

Increasingly electric vehicle design is looking forward the application of multiple ratio transmissions in place of traditional single ratio gearboxes. The choice of gear ratio has significant influence on vehicle performance, including range, acceleration, and gradeability. To study the impact of different transmissions on EV's dynamic and economic performance, mathematical models of an EV is presented which is applicable to both single and multiple ratio transmissions. These transmission variants are then studied under different operating conditions to investigate how operating conditions in the motor work efficiency change with different transmissions. Here comparisons are made between 2-speed and single speed transmission. Then the reasons for the results are analysed. Copyright © 2012 by ASME.

Sun B.,Beijing Jiaotong University | Jiang J.,Beijing Jiaotong University | Han Z.,Beijing Jiaotong University | Han Z.,Beijing Electrical Vehicle Co. | And 2 more authors.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2016

Lithium power battery is usually impacted by low temperature in a particular situation, and its low temperature stress is different with that in initial condition. Taken 35 Ah composite battery as an example, work range of the battery was divided by the transformation curve of the incremental capacity analysis based on different reaction stages of battery charging and discharging process. By aging the batteries at different SOC range, this paper traced the changes of electrochemical properties and analyzed degradation mechanism. Under 0℃ environment, the stress differences under low temperature of batteries which were degraded through different paths, was analyzed using C/3, 1C, 3C/2, 2C and 5C/2 currents to impact the aging cells by charging and discharging respectively. The result showed that the power battery produced obviously different degradation paths when it cycled at different SOC ranges. There is no mapping relation and consistency between low temperature degradation and cycling degradation. The conclusion provides the basis for battery pack lifetime analysis and second battery matching. © 2016, The editorial office of Transaction of China Electrotechnical Society. All right reserved.

Wang A.-J.,Beijing Institute of Technology | Wang A.-J.,Beijing Electrical Vehicle Co. | Ge Y.-S.,Beijing Institute of Technology | Tan J.-W.,Beijing Institute of Technology | And 4 more authors.
Journal of Beijing Institute of Technology (English Edition) | Year: 2011

A total of 14 in-use diesel buses were selected to conduct emission measurement using a portable emissions measurement system (PEMS) in Beijing. Their instantaneous gaseous emission rates, particular matter (PM) emission rates and driving parameters were obtained. The influences of speed, acceleration and vehicle specific power (VSP) on emissions were analyzed. Based on the relationships between these driving parameters and emissions, 24 driving bins defined by speed, acceleration and VSP were constructed with cluster analysis to group emission rates for Euro III and IV buses, respectively. Then the emissions reductions from Euro III to Euro IV diesel buses were analyzed. Lastly, on-road hot-stabilized emission rate model for diesel buses in Beijing was developed. Through the comparison of the model simulation emission rates with the measured emission rates, the modeled emission results were in good agreement with the measured emission results. In most of the cases, the differences were less than 12%. © Copyright.

Gao X.,Beihang University | Gao X.,Beijing Electrical Vehicle Co. | Su D.,Beihang University | Li Y.,Beijing Electrical Vehicle Co.
2015 Asia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2015 | Year: 2015

Electric Vehicle (EV) is driven by electromotor, whose power comes from vehicle power battery. The advantage of the EV is the mechanical simplicity of the drivetrain, but the electromagnetic interference (EMI) is a difficult problem to solve. This paper first describes the electromagnetic interference (EMI) phenomenon generated by one kind of DC/DC converter, Then analyses the reason of the EMI, and finally puts forward the design optimization direction of EMC from the vehicle. © 2015 IEEE.

Xiang J.,Beijing Institute of Technology | Xiang J.,Beijing Electrical Vehicle Co. | Wu F.,Beijing Institute of Technology | Chen R.,Beijing Institute of Technology | And 2 more authors.
Journal of Power Sources | Year: 2013

Novel binary electrolytes based on ionic liquid (N-butyl-methyl piperidinium bis(trifluoro-methylsulfonyl)imide, PP14-TFSI) and sulfone (tetramethylene sulfone, TMS) have been prepared and examined for use in lithium-ion batteries. The addition of sulfone is expected to improve the lithium salts solvability, ionic conductivity and electrode compatibility of the ionic liquid greatly. More importantly, the addition of sulfone is not expected to deteriorate the peculiar properties of the ionic liquid, such as the wide electrochemical window and non-flammability. Experimental results have shown that the reversible discharge capacities of the Li/LiFePO4 half-cell, which contains a 0.5 M LiTFSI/(60%) PP14-TFSI/(40%) TMS mixed electrolyte at a current density of 0.05 C and 1 C, can reach up to 160 and 150 mAh g-1, respectively, which are much higher than the discharge capacity achieved using the pure ionic liquid electrolyte under the same conditions. Furthermore, lithium difluoro(oxalato)borate (LiDFOB) has been found to have positive effects on the battery performance of the mixed electrolytes. The 0.5 M LiDFOB/(60%) PP14-TFSI/(40%) TMS mixed electrolyte exhibits better compatibility with the Li1.2Ni0.2Mn 0.6O2 cathode than conventional electrolytes, where an initial discharge capacity of 255 mAh g-1 is obtained and a stable capacity of above 230 mAh g-1 is retained after 30 cycles. © 2013 Elsevier B.V. All rights reserved.

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