Current Issue : October - December Volume : 2019 Issue Number : 4 Articles : 5 Articles
A method based on fusion ofmultiple features is proposed to assess and accurately describe the performance degradation of lithiumion\nbatteries in this paper. First, the discharge voltage signal of lithium-ion batteries under real-time monitoring is analyzed from\nthe perspective of time domain and complexity to obtain the values ofmultiple features.Then, the multi-feature parameters undergo\na spectral regression process to reduce the number of dimensions and to eliminate redundancy, and on the basis of this regression,\na Gaussian mixture model is established to model the health state of batteries.Thus, the degree of lithium-ion battery performance\ndegradation can be quantitatively assessed using the Bayesian inference-based distance metric. A case calculation experiment is\ncarried out to verify the effectiveness of the method proposed in this paper.The experimental results demonstrate that, compared\nwith other assessment methods, the performance degradation assessment method proposed in this paper can be used to monitor\nthe degradation process of lithium-ion batteries more effectively and to improve the accuracy of condition monitoring of batteries,\nthereby providing powerful support for making maintenance decisions....
At present, electric vehicles are very common means of transportation in our\nlife. Contact charging is the main method of electric vehicles in China. With\nthe continuous improvement of peopleâ??s awareness of environmental protection,\nwireless charging technology is also under constant development. Currently,\nthere are more static wireless charging technologies, while dynamic\ncharging mode is only a perfection and supplement to it, which is crucial to\nthe promotion of electric vehicles and is able to make charging work faster\nand easier. China has been researching dynamic wireless charging technology,\nbut it has been affected by many factors. Therefore, it is necessary for the\nrelevant personnel to solve the existing obstacles according to the characteristics\nof dynamic wireless charging technology and apply dynamic wireless\ncharging technology in an efficient manner....
Vehicles equipped with in-wheel motors (IWMs) feature advanced control functions that\nallow for enhanced vehicle dynamics and stability. However, these improvements occur to the\ndetriment of ride comfort due to the increased unsprung mass. This study investigates the driving\ncomfort enhancement in electric vehicles that can be achieved through blended control of IWMs\nand active suspensions (ASs). The term â??ride blendingâ?, coined in a previous authorsâ?? work and\nherein retained, is proposed by analogy with the brake blending to identify the blended action\nof IWMs and ASs. In the present work, the superior performance of the ride blending control\nis demonstrated against several driving manoeuvres typically used for the evaluation of the ride\nquality. The effectiveness of the proposed ride blending control is confirmed by the improved key\nperformance indexes associated with driving comfort and active safety. The simulation results refer\nto the comparison of the conventional sport utility vehicle (SUV) equipped with a passive suspension\nsystem and its electric version provided with ride blending control.The simulation analysis is\nconducted with an experimentally validated vehicle model in CarMaker® and MATLAB/Simulink\nco-simulation environment including high-fidelity vehicle subsystems models....
The Netherlands is a frontrunner in the field of public charging infrastructure, having one\nof the highest number of public charging stations per electric vehicle (EV) in the world. During the\nearly years of adoption (2012-2015), a large percentage of the EV fleet were plugin hybrid electric\nvehicles (PHEV) due to the subsidy scheme at that time. With an increasing number of full electric\nvehicles (FEVs) on the market and a current subsidy scheme for FEVs only, a transition of the EV fleet\nfrom PHEV to FEV is expected. This is hypothesized to have an effect on the charging behavior of the\ncomplete fleet, and is reason to understand better how PHEVs and FEVs differ in charging behavior\nand how this impacts charging infrastructure usage. In this paper, the effects of the transition of\nPHEV to FEV is simulated by extending an existing agent-based model. Results show important\neffects of this transition on charging infrastructure performance....
This paper presents a thermal interface for cylindrical cells using busbar-integrated cooling\nchannels. This interface is available due to the use of a stand-alone refrigerant circuit for the thermal\nmanagement of the battery. A stand-alone refrigerant circuit offers performance and efficiency\nincreases compared to state-of-the-art battery thermal management systems. This can be achieved\nby increasing the evaporation temperature to the requirements of the Li-ion cells and the use of\nalternative refrigerants. The solution proposed in this paper is defined for electric two-wheelers,\nas the thermal management of these vehicles is currently insufficient for fast charging where high\nheat losses occur. Three channel patterns for the integrated busbar cooling were examined regarding\ntheir thermal performance to cool the li-ion cells of a 16p14s battery pack during fast charging. A\nmethod of coupling correlation-based heat transfer and pressure drop with thermal finite element\nmethod (FEM) simulations was developed. The symmetric channel pattern offers a good compromise\nbetween battery temperatures and homogeneity, as well as the best volumetric and gravimetric energy\ndensities on system level. Average cell temperatures of 22 DegreeC with a maximum temperature spread of\n8 K were achieved....
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