Changan Automotive Engineering Institute

Chongqing, China

Changan Automotive Engineering Institute

Chongqing, China
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Xu Y.,Jilin University | Zhang L.-P.,Changan Automotive Engineering Institute | Tian J.,Jilin University | Liu Z.-C.,Jilin University | And 2 more authors.
Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | Year: 2016

Effects of loading rates, initial loads and loading times on turbocharged heavy-duty diesel engine under transient operating condition with constant speed and increasing torque were experimentally investigated. The parameters of "average increment ratio of air and fuel" and "average deceleration of α" are proposed to evaluate the air-supply response performance and αreduction rate, respectively. Results show that brake specific fuel consumption (BSFC), smoke, CO and air-supply delay are increased while NOx emission is decreased when the loading rate is increased or initial load is decreased. Deterioration of BSFC and smoke are light and heavy load areas respectively. With the increase of loading time, air-supply response is improved, but fuel economy and emissions of smoke and CO are deteriorated. However, there exists a shift in peak values of smoke and CO emission with loading time. © 2016, Chinese Society for Internal Combustion Engines. All right reserved.

Wang D.,Jilin University | Song J.,Jilin University | Liu B.,Changan Automotive Engineering Institute
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2010

The powertrain dynamics parameters of a passenger car were obtained through the three-dimensional modeling, experiment and calculation. Based on these parameters, a torsional vibration analysis model of powertrain was built under the condition of driving and idling. The effect of DMF on the driveline natural characteristics and forced vibration response characteristics were analyzed. The main performance parameters of the DMF were optimized and matched. This research provides a basis for the design and matching of the DMF.

Wang D.F.,Jilin University | Ji F.,Jilin University | Chen S.M.,Jilin University | Li Y.S.,Changan Automotive Engineering Institute | And 2 more authors.
Applied Mechanics and Materials | Year: 2013

The implicit parametric method was briefly discussed in this paper. An implicit parametric 3D solid model and a finite element (FE) model of a body-in-white (BIW) were built up by this method. Low order natural vibration frequencies and modes, bending and torsional stiffness of the BIW were analyzed by FE calculation. A good agreement was acquired by comparing the prediction results with the test values. Results indicated that the implicit parametric model of the BIW established could be used for design and development of the BIW in concept design stage of the BIW. © (2013) Trans Tech Publications, Switzerland.

Ji F.,Jilin University | Wang D.,Jilin University | Chen S.,Jilin University | Liu B.,Changan Automotive Engineering Institute | Li X.,Changan Automotive Engineering Institute
Qiche Gongcheng/Automotive Engineering | Year: 2014

A fully parameterized implicit 3D geometric model and, based on which, a parameterized FE model for the body-in-white (BIW) of a car are successively built with SFE-Concept software, and the low-order natural vibration characteristics and torsional and bending stiffness of the BIW are calculated with their validities verified by tests. A multi-objective lightweight optimization on the BIW is conducted by using genetic optimization algorithm with the thicknesses of 66 BIW panels selected by relative sensibility analysis as lightweight design variables, the total mass and torsional and bending stiffness of the BIW as objective functions and the 1st order bending and torsional frequencies as constraints. The results indicate that after lightweight optimization the changes in both 1st order bending and torsional frequencies are within 1%, the stiffness in torsion and bending, though reduce by 4.5% and 1.8% respectively, still meet the design requirements, and the total mass of BIW reduces by 19.4kg, i.e. lightens by 6.4% without changing material, achieving obvious BIW lightweighting results.

Han Y.,Jilin University | Zhang L.,Changan Automotive Engineering Institute | Liu Z.,Jilin University | Tian J.,Jilin University
Energy | Year: 2016

The object of this paper is to reveal the mechanism of combustion process and pollutant emission deterioration during transient operation and propose an improve method to reduce transient smoke opacity as much as possible while keep NOx formation below steady state condition. The paper reveals the transient operation deterioration mechanism from the following three levels: First, the combustion parameters response level (also known as boundary condition response level); Second, combustion process level (chiefly refer to apparent heat release rate, in-cylinder pressure, combustion phasing and combustion duration etc.); Third, in-cylinder micro-analysis level (chiefly refer to air fuel mixing energy ME). The main contributor of performance deterioration is boundary conditions deviation which caused by inconsistent response delay due to turbocharger lag. The consequence of boundary condition deviation is air-fuel mixing energy (ME) reduction. The improved method is to increase air-fuel mixing energy to compensate the negative effect cause by turbocharged lag. This work increases ME by means of advancing injection timing. The results indicates that: The BTE increases 2.2% and smoke decreases 12.1% as the injection timing advances 2 °CA, compared with the level under original injection timing. Therefore increasing ME can alleviate transient operation deterioration by improving the quality air-fuel mixture formation. © 2016 Elsevier Ltd

Zheng Y.,Chongqing University | Yu J.,Chongqing University | Wang Q.,Chongqing University | Jia J.,Chongqing University | And 2 more authors.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2011

The high voltage pulse generated by the spark plug discharge in ignition system on an automotive is a main source of EMI. In order to predicate the electromagnetic compatibility (EMC) of the ignition system, the accurate model of the spark plug is needed. This paper extracts the parasitic parameter of the spark plug by finite element method (FEM) approach at first; then through analyzing discharge characteristics and mechanism of the spark plug discharge, the air-gap of the spark plug is treated as non-linear resistance model; finally the dynamic circuit model of the spark plug which includes the static parasitic capacitance and the non-linear resistance is established. The model is verified by measurement and simulation results.

Zheng Y.,Chongqing University | Zheng S.,State Grid Corporation of China | Wang Q.,Chongqing University | Yan X.,Chongqing University | Li X.,Changan Automotive Engineering Institute
Applied Mechanics and Materials | Year: 2013

The common-mode current along the harness is one of the main reasons which can not meet the automotive electromagnetic compatibility (EMC) standards for equipment or system. So, the harness model is the critical factors for the automotive EMC prediction. In this paper, the harness network equivalent model is proposed, which is based on the terminal loads and the equivalent wave impedance. The equivalent model is also demonstrated from the simulation results by finite element method. © (2013) Trans Tech Publications, Switzerland.

Long H.,Chongqing University | Hu Y.,Chongqing University | Liu B.,Changan Automotive Engineering Institute | Jin X.,Chongqing University | Zhu H.,Chongqing University
Qiche Gongcheng/Automotive Engineering | Year: 2016

In view of the common phenomenon of fatigue failure of spot welds occurred in the proving ground test during vehicle development process, firstly the road load spectra in vehicle durability test are collected according to road test requirements and the time histories of force and moment loadings in three directions of 19 connection points on the body and chassis of a vehicle are obtained by using virtual iteration. Then a finite element models for body-in-white with welding spots is built, and the stress distributions in the spot welds of connecting points and their surrounding panels are calculated by applying inertia relief method in Nastran. Finally with the loading spectra obtained by virtual iteration as excitations, the fatigue analysis and accumulated damage superimposition are performed, the potential risks of spot welds designed are predicted and the fatigue lives of spot welds are enhanced by locally adding spot welds and optimizing spot weld layout. © 2016, Society of Automotive Engineers of China. All right reserved.

Wang H.-X.,Chongqing University | Wang H.-X.,Hubei Automotive Industries Institute | Gong X.-S.,Chongqing University | Pan F.,Chongqing University | Qiao Y.-J.,Changan Automotive Engineering Institute
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2015

A modified normalized Bouc-Wen model was adopted to describe the hysteretic behaviour of an O-type wire-cable vibration isolator which exhibits nonlinear elastic stiffness and asymmetric hysteresis dynamic behavior. The parametric identification of the O-type wire-cable vibration isolator was realized based on the modified normalized Bouc-Wen model. A new simple yet effective two-stage identification method was developed. Numerical simulations and periodic loading experiments were carried out to validate the proposed identification method. The results indicate that the proposed identification method is effective and accurate for identifying the model parameters of O-type wire-cable vibration isolator, and the experimental hysteresis loops are close to the identified hysteresis loops. ©, 2015, Chinese Vibration Engineering Society. All right reserved.

Wang W.,ChangAn Automotive Engineering Institute | Zhou Z.,ChangAn Automotive Engineering Institute
Lecture Notes in Electrical Engineering | Year: 2013

During the engineering process of the BIW development, in order to fulfill the requirements of design and the demands of customers, it is extraordinarily necessary to conduct tolerance analysis of each pivotal and vital feature of Body In White opportunely based on the body structure, the process route and the level of manufacturing. The application of tolerance analysis in the engineering process can help achieve the purpose of optimizing the body structure as well as the process route, and promoting the accuracy control of the body. © Springer-Verlag 2013.

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