China Automotive Engineering Research Institute

Chongqing, China

China Automotive Engineering Research Institute

Chongqing, China
SEARCH FILTERS
Time filter
Source Type

Duan H.-M.,Tongji University | Xie F.,China Automotive Engineering Research Institute | Zhang K.-B.,China Automotive Engineering Research Institute | Ma Y.,China Automotive Engineering Research Institute | Shi F.,China Automotive Engineering Research Institute
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2011

The components of road surface measurement system and measurement methods of road surface profile in automotive tests were reviewed. Based on the massive road surface measurement data, some signal pre-processing methods were proposed, including the identification and correction of abnormal errors, the extraction of signal trends, the smooth connection of segmental data, the randomness test of measurement data and the data processing at the moment of speed anomaly. After the introduction of principles and algorithms of these methods, several actually measured road data were taken as examples, and show that the results of calculation and processing are significant, and the methods are simple and of obvious effect. They can be widely applied to road surface data processing as well as to other engineering vibration signals processing.


He Z.,China Automotive Engineering Research Institute | Ou Y.,China Automotive Engineering Research Institute | Yuan J.,China Automotive Engineering Research Institute
Lecture Notes in Electrical Engineering | Year: 2013

This paper focuses on developing the torque dynamic distribution algorithm of In-Wheel-Motor electric vehicle. The algorithm is developed to regulate the vehicle body yaw rate by changing the motor drive torque distribution between front wheel and rear wheel. The control aim is to control the vehicle yaw rate approach to the desired yaw rate. The proposed control strategies are evaluated with simulation, and the results show that the proposed method can improve the vehicle stability. © 2013 Springer-Verlag.


Li M.,China Automotive Technology and Research Center | Nie Y.,China Automotive Engineering Research Institute | Xu J.,China Automotive Engineering Research Institute | Qin K.,China Automotive Technology and Research Center | Jing X.,China Automotive Technology and Research Center
Jiangsu Daxue Xuebao (Ziran Kexue Ban)/Journal of Jiangsu University (Natural Science Edition) | Year: 2011

The emission test on four different vehicles was conducted by using on-board test system. Based on the theory of SCR, the reason of higher NOx emission from State IV conventional bus and hybrid bus equiped with SCR was analysed. By combining the data from the test and the methods of 'idle' and 'segment', the relationship between exhaust temperature and NOx emission was studied. The results show that the use of SCR technology can reduce NOx emissions to a certain extent. When the exhaust temperature is between 130°C and 230°C, the NOx conversion efficiency increases about 6% with temperature increase of about 10°C. For transit bus with SCR, especially HEV, the proportion of the exhaust temperature above 230°C is very small, which causes the lower conversion efficiency and higher NOx emission. Some technology (e.g. exhaust heating system) should be used or the transformation efficiency under low temperature should be increased.


Liu Z.,China Automotive Engineering Research Institute | Wang H.,China Automotive Engineering Research Institute | Wang Y.,China Automotive Engineering Research Institute
Lecture Notes in Electrical Engineering | Year: 2013

Currently the advanced UREA-SCR system is one of the most popular technology to meet the strict emission standards as Euro IV or above. In order to reach high NOx conversion and low NH3 slip, the urea dosing rate needs to be calculated and controlled precisely. This paper describes an advanced UREA-SCR system based on model based control strategy and advanced diaphragm urea dosing pump. The strategy can be seen as a virtual closed-loop control method for the dosing rate calculation, and it was integrated with the advanced diaphragm urea dosing pump for the tailpipe urea dosing. A SCR chemical reaction model was developed to describe the concentration of different spices inside the SCR catalyst. Three different reactions were taken as the foundation of the model, including fast reaction, normal reaction and slow reaction. To simplify the process of calculation, the catalyst model was divided to three cells. In each cell, the NH3 storage ability was estimated and the results were taken as the feedback signals for the controller. A virtual closed-loop control method was developed to calculate the dosing rate. The model was tuned under different engine running conditions, the exhaust gas temperature was controlled between 250 and 400 C and the NH3/NOx molar ratio was controlled between 0.8 and 1.1. An advanced-diaphragm urea dosing pump was developed to finish the urea dosing activity. The results of transient engine running experiment show that the NOx conversion efficiency can reach 85 % while keeping the average NH3 slip under 15 ppm, the peak average NH3 slip under 30 ppm. And the dosing rate error can be controlled less than 3 %. © 2013 Springer-Verlag Berlin Heidelberg.


Gui Z.X.,Huazhong University of Science and Technology | Zhang Y.S.,Huazhong University of Science and Technology | Li H.Q.,Huazhong University of Science and Technology | Ma M.T.,China Automotive Engineering Research Institute
Advanced Materials Research | Year: 2013

Full-scaled hot stamping dies were designed for a vehicle bumper, based on evaluation of cooling system by FE simulation and the temperature variation assessment by analytical model. The blank shape was gained using inverse algorithm and well-designed according to production practice. Experiments were conducted to verify the reliability of both the die and blank design, as well as tests for microstructure and mechanical properties of the hot-stamped part. Results show that, CAE analysis provides a robust support for hot stamping die and blank design; Position stability of hot blank is greatly improved during robotic transport process after shape designing; Metallographic analysis demonstrates the hot-stamped bumper obtained a fully martensitic microstructure, its tensile strength is about 1550 MPa, microhardness is 47.5 HRC, and the elongation is up to 6%. © (2013) Trans Tech Publications, Switzerland.


Yao L.,China Automotive Engineering Research Institute | Zhang G.,Pan Asia Technical Automotive Center Co.
Lecture Notes in Electrical Engineering | Year: 2013

Research and/or Engineering Questions/Objective The inertia excitation and the unbalanced force is one of main excitation sources, which induce the vehicle interior structure-borne noise. The research on the optimization of the PT mounting system is very common, but the research on how to modify the vehicle panel to reduce the structure-borne noise induced by engine is very few. The paper utilizes CAE technology and transfer path analysis for identifying the main transfer path, and the control of the vehicle interior structure-borne noise excited by engine excitation is well implemented. Methodology A new TPA method based on the CAE technology is proposed to analyze the vehicle interior structure-borne noise in present work. This method can implement the control of the vehicle interior structure-borne noise excited by engine excitation through the control of the transfer function of subsystem on the main transfer path. In present method, the finite element method is used to establish the dynamics model of vehicle PT-Body coupled system is establish, and the prediction of vehicle interior structure-borne noise is investigated, then the main transfer path is identified by using TPA method on the basis of subsystem response. Finally, the Panel contribution Analysis (PCA) techniques can be implemented on the structure- acoustic transfer function of body-subsystem in the uppermost transfer path, and the dominant panel contributions can be identified. Results This paper considers a problem of micro-car interior structure-borne noise generated by engine excitation. The micro-car is simply treated with a coupled system composed with two subsystems, namely body-subsystem and PT-subsystem. In the light of above method, the prediction on vehicle interior structure-borne noise induced by the engine second excitation is obtained. As the main transfer path then is found out. The PCA technology is utilized to analyze the special structural acoustic transfer function. The result shows the main panels are the dash panel and the roof, respectively. The topography technology is applied to optimize the main panel to improve the performance. The result shows the proposed method reduce the vehicle interior structure-borne noise effectively. Limitations of this study The vehicle interior structure-borne noise induced by the chassis subsystem is not studied and the chassis transfer path analysis is also not carried out in present work. This paper has not studied the influence due to the error of CAE model. There are some others TPA methods such as Fast TPA, multilevel TPA, presently. These ideas in other TPA methods should be used for reference in present method. What does the paper offer that is new in the field in comparison to other works of the author A new TPA method based on the CAE technology is proposed to analyze the vehicle interior structure-borne noise induced by engine excitation in present work. The CAE technology will be introduced to improve the range and effect of TPA. This paper introduces the PCA techniques into TPA method, and synergies the strengths of PCA and TPA methods. The proposed method improves the optimization efficiency compared with classical CAE technology. Compared to the classical TPA, the present method provides the NVH design directions at detailed engineering phase even at the concept phase. Conclusion The new TPA method synergies the strengths of CAE and TPA methods, is feasible to analyze the interior structure-borne noise induced by engine excitation. The PCA technology is well applied into the optimization of vehicle interior structure-borne noise. The present method is applicable and can provide broad guidance for interior noise control in the design process. © 2013 Springer-Verlag.


Zhang Y.,China Automotive Engineering Research Institute | Xiong R.,Beijing Institute of Technology
Lecture Notes in Electrical Engineering | Year: 2013

A rapid control prototyping design for hybrid power system has been proposed based on the real-time simulation test bench which constituted by double xPC Target system. A Topology structure is analyzed that the ultracapacitors are connected with power battery packs parallel after a bidirectional DC/DC converter. The ultracapacitor, power battery and the hybrid power system are modelled. For the electric vehicle (EV) application, the control strategy for the hybrid power system is proposed. The simulation results of the hybrid power system and battery-only power system is analyzed under the UDDS (Urban Dynamometer Driving Schedule) with the selective topology structure of hybrid power system. It was suggested that the ultracapacitor can significantly improve the efficiency of the hybrid power system, and the energy consumption of the power battery may decrease 8.97 %. Furthermore, the ultracapacitor can efficiency balance the output of the power battery, and the cycle life of the power battery is significantly improve through optimizing its working range. © 2013 Springer-Verlag.


Ma M.,China Automotive Engineering Research Institute | Lu H.,China Automotive Engineering Research Institute
Lecture Notes in Electrical Engineering | Year: 2013

Automotive lightweight is quite important and active demand, due to the requirements of automotive industry development, energy saving and emission reduction. This chapter illuminates the signification, the conception and comprehension, characterization parameters and execution methods about automotive lightweight and lightweight design. The physical and technical signification of parameters in the lightweight coefficient equation is explained also. A more direct parameter, lightweight exponent Li is suggested, and the physical and technique significations of those parameters in lightweight exponent Li equation are clarified for various conditions of lightweight. The execution approaches of automotive lightweight and the relationship of the performance of typical parts with the performance of materials are discussed. A life cycle analysis method is presented to evaluate the economy, selection and application of the lightweight materials and technologies. © Springer-Verlag 2013.


Fan S.,China University of Mining and Technology | Li B.,China University of Mining and Technology | Chen J.,China Automotive Engineering Research Institute
Jixie Qiangdu/Journal of Mechanical Strength | Year: 2011

Aiming at analysising the influence of interference fit and frictional coefficient of fretting on the contact surface comprised by outer plate and pin on fretting wear, the distribution of elastic stresses on the contact surface was analyzed using a finite element solver Ansys, the contact status(sticking, sliding and opening) and the distribution of elastic stresses on the contact line which microcracks prefer to occur on the contact surface were computed based on different interference fit and frictional coefficient. The results show that the tensile stress and shear stress all obtain the extremum value on the contact line and microcracks prefer to occur in the interface point between sticking zone and sliding zone, the changing of interference fit and frictional coefficient of the contact surface can adjust the location of the interface point and the location of nucleating microcracks.


Tao C.,China Automotive Engineering Research Institute
IEEE Transportation Electrification Conference and Expo, ITEC Asia-Pacific 2014 - Conference Proceedings | Year: 2014

Considering the potential risks due to failure of electronic system of the dual-motor hybrid electric powertrain, this paper proposed a functional safety concept following the ISO 26262 standard. Firstly, the configuration and operation mode of the dual-motor hybrid powertrain was introduced. Next, based on the functional safety standard, potential hazards were analyzed and risks integrity level was assessed, then a functional safety concept has been designed taking account of the current developing capability of domestic powertrain suppliers, and finally functional safety requirements of vehicle controller unit which mainly responsible for the whole vehicle safety were developed. © 2014 IEEE.

Loading China Automotive Engineering Research Institute collaborators
Loading China Automotive Engineering Research Institute collaborators