Chongqing Vehicle Test and Research Institute Co.

Chongqing, China

Chongqing Vehicle Test and Research Institute Co.

Chongqing, China
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Zhang C.,Beijing Institute of Technology | Ge Y.,Beijing Institute of Technology | Tan J.,Beijing Institute of Technology | Li L.,Beijing Institute of Technology | And 3 more authors.
Journal of Energy Resources Technology, Transactions of the ASME | Year: 2017

In this study, the emissions from three passenger cars with gasoline, methanol, ethanol, and their blend were tested. The results show that the CO and HC emissions from the exhaust of the vehicles fueled with E7.5/M7.5 decrease compared with those from the vehicles fueled with the gasoline, E10 or M15, while NOx emissions increase by 7.5-25.8%. Formaldehyde and acetaldehyde are found higher for the vehicles fueled with E7.5/M7.5, whereas a series of volatile compounds become lower. Evaporative emissions of the vehicles fueled with E7.5/M7.5 were higher than those of the vehicles fueled with gasoline, by a range of 16.39-28.28%. Copyright © 2017 by ASME.


Mao X.-Z.,Chongqing Vehicle Test and Research Institute Co. | Xia M.,Chongqing University of Technology | Tian T.,Jilin University
Applied Mechanics and Materials | Year: 2014

The dynamic evolution mechanism of dislocation under shearing stress which was the main influences of damping performance in the inner space of magnesium alloy was studied. Firstly, the inner shearing stress and its distribution of the rectangular magnesium alloy beam was calculated while the beam was bending; Secondly, the breeding and networking model of dislocation under the action of shearing stress was constructed; Finally, combined with the practical observed dislocation morphology, clarified the dynamic evolution mechanism: Under the shear stress, through F-R dislocation breeding and extension as well as twisting of dislocation with different dislocation sources under subsequent breeding, the dislocation cellular network structure is formed, which is of approximate honeycomb structure. © (2014) Trans Tech Publications, Switzerland.


Tian T.,Jilin University | Mao X.Z.,Chongqing Vehicle Test and Research Institute Co. | Mi L.,Chongqing University of Technology
Applied Mechanics and Materials | Year: 2014

The present situation of damping capacity for magnesium alloys test techniques and its equipment were reviewed. Because there were many types of test equipment, So it pointed out the suitability of all testing equipment and schemes for damping testing of magnesium alloys. And based on the research results of dislocation damping mechanism of magnesium alloys. The author holds that test scheme for torsional deformation of torsion pendulum and test scheme for bending and shearing deformation of dynamic thermal mechanical analyzer meet high-precision test requirements for non-linear damping capacity of magnesium alloys. The study make great value for testing damping of magnesium alloys and reflecting their damping advantage. © (2014) Trans Tech Publications, Switzerland.


Deng Z.,Chongqing University | Lai F.,Chongqing University | Lai F.,Chongqing Vehicle Test and Research Institute Ltd Corporation
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2011

A new type of electromagnetic linear actuator for vehicle active suspension is designed, with the characteristics of large stroke and force and fast response. Combined with the finite element analysis software, the effects of actuator structure parameters such as gap thickness, secondary stainless steel tube thickness, secondary copper layer thickness, magnetic permeability and electrical conductivity of insulated retainer ring and primary coil winding mode on actuator thrust size and response speed are studied. And the effects of actuator power parameters such as voltage, frequency and loading mode on actuator thrust size and response speed are also studied. The results show that the electromagnetic force is closely related to structural parameters such as the gap thickness, except for the conductivity of insulated retainer ring. And the electromagnetic force is proportional to the square of the voltage, and first increases and then decreases with the increase of frequency, getting the maximum at 20 Hz. Based on the simulation results, a prototype of electromagnetic linear actuator with appropriate parameters is developed. And the steady electromagnetic force and phase current test of the actuator is carried out. Comparison between the finite element simulation results and the experimental data shows they are basically consistent, thus verifying the correctness of the relevant design and analysis. ©2011 Journal of Mechanical Engineering Society.

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