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Xiangyang, China

Hong H.-F.,Dongfeng Automobile Co.
Zhuzao/Foundry | Year: 2011

The volume variation mode of ductile iron during solidification was analyzed, and the result that feeding is needed for ductile iron was obtained. The casting and practical production conditions should be taken into account for ductile iron feeding. The selecting method of general riser, pressure control riser, and full pressure riser were presented, based on different mould and casting module. Some key problems were discussed, such as casting module, solidifying sequence, riser position, feeding channel, temperature gradient, feeding of isolated hot spot, metallurgy quality, inoculation, and so on. Source

Peigang Y.,Hunan Biological and Electromechanical Polytechnic | Jianming B.,Dongfeng Automobile Co. | Ruibin J.,Hunan Biological and Electromechanical Polytechnic | Shaohua X.,Hunan Biological and Electromechanical Polytechnic | Yifeng D.,Hunan Biological and Electromechanical Polytechnic
Sensors and Transducers | Year: 2014

Based on ECAS, this paper intended to develop a modular air suspension height control system with WABCO4728800010 two-position three way solenoid valves and Free scale MC9S12D64 microprocessor as its core components. And a simulation test was conducted in MATLAB/Simulink environment. The air suspension height control strategy of this system was divided into four modules: start control module, dynamic adjustment module, manual adjustment module and errors adjustment module, which were controlled by module select switch. Simulation tests indicated that the air suspension height control strategy is featured by its logical control accuracy and debug convenience, and the modular design greatly reduced the system complexity and software development cycle and costs as well. © 2014 IFSA Publishing, S. L. Source

Zhao X.-Q.,Dongfeng Automobile Co.
Zhuzao/Foundry | Year: 2011

The foundry method of shell mold with iron shot for exhaust pipe was presented, which can produce smooth face and internal compact structure casting. The practice results show that with rapid cooling rate, ferrite more than 95%can be obtained in the structure of Cummins exhaust pipe by adjusting the content of C, Si and strengthening inoculation. Source

Yu J.W.,Henan University of Technology | Liu N.,Zhengzhou University | Wang B.,Dongfeng Automobile Co.
Applied Mechanics and Materials | Year: 2014

Road roughness, the most direct automotive input, is a kind of basic data. Its analysis and applications have important effects on vehicle performance. Several methods such as wavelet analysis, amplitude-domain analysis, frequency-domain analysis are used to analyze the road elevation series of a highway. Through some disposal of the original survey data, a series of representative data has been taken to reproduction test in a 4-poster road simulator. Both analyses and test results show that, the proposed methods can be used for the actual data process of road roughness and in the vehicle bench test. © (2014) Trans Tech Publications, Switzerland. Source

Ma W.-X.,Jilin University | Ji L.-F.,Jilin University | Xu W.,Dongfeng Automobile Co. | Liu C.-B.,Jilin University
Huanan Ligong Daxue Xuebao/Journal of South China University of Technology (Natural Science) | Year: 2016

Firstly, a high-performance general three-element centripetal turbine torque converter with an effective cycle round diameter of 425 mm was selected as a reference prototype to design a prototype with the same performance by means of similar-design method. Secondly, the cycle round and blades of double-impeller torque converter were obtained by segmenting the impeller blades of the prototype reasonably. Then, the structure of slip clutch was designed, and the main technical parameters of slip clutch and friction plate were determined. Finally, the designed double-impeller torque converter was calculated numerically by means of CFD (Computational Fluid Dynamics) method to obtain the capacity characteristics and the original characteristics under such three conditions as double working impellers, single working impeller and slipping. It is indicated by comparative analysis that the designed double-impeller torque converter can realize the continuity and controllability of capacity through slip control, so that it can be used to the variable capacity matching between loader engine and torque converter. © 2016, Editorial Department, Journal of South China University of Technology. All right reserved. Source

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