FAW Jiefang Qingdao Auto Factory

Qingdao, China

FAW Jiefang Qingdao Auto Factory

Qingdao, China

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Zhao L.,Shandong University of Science and Technology | Cao Q.,Shandong University of Science and Technology | Li Y.,Shandong University of Science and Technology | Gao N.,FAW Jiefang Qingdao Auto Factory
Proceedings 2011 International Conference on Transportation, Mechanical, and Electrical Engineering, TMEE 2011 | Year: 2011

Braking force distribution coefficient of the axles influences the braking efficiency and the directional stability when the truck is braking. So, reasonable distribution coefficient is very important for traffic safety. Truck generally travels on the road that has a certain range of adhesion conditions. Through calculating the max value of truck brake efficiency in the certain range of adhesion conditions, the paper defines the optimal distribution coefficient, and applies this kind of technique to optimize the braking force distribution coefficient of one kind of FAW truck. It also compares the optimized front and rear curve of utilization adhesion coefficient and severity of braking with the curve before optimization, and analyzes the curves. Finally, the paper conducts road test of a truck. The results show that the technique can improve brake efficiency of truck and have good practical value. © 2011 IEEE.


Zhou L.,Tsinghua University | Xie M.,Dalian University of Technology | Luo K.H.,University of Southampton | Jia M.,Dalian University of Technology | And 2 more authors.
SAE Technical Papers | Year: 2013

Early injection timing is an effective measure of pre-mixture formation for diesel low-temperature combustion. Three algebraic subgrid models (Smagorinsky model, dynamic Smagorinsky model and WALE model) and one-equation kinetic energy turbulent model using modified TAB breakup model (MTAB model) have been implemented into KIVA3V code to make a detailed large eddy simulation of the atomization and evaporation processes of early injection timing in a constant volume chamber and a Ford high-speed direct-injection diesel engine. The results show that the predictive vapor mass fraction and liquid penetration using LES is in good agreement with the experiment results. In combustion chamber, the sub-grid turbulent kinetic energy and viscosity using LES are less than with the RANS models, and following the increasing time, the sub-grid turbulent kinetic energy and viscosity also increase and are concentrated on the spray area. In the meantime, advancing the injection timing can help achieve more homogenous mixture between the fuel and ambient gas. The distribution of the mixture is more uniform and the three-dimension and disorder structures are more obvious using the LES model. Copyright © 2013 SAE International.


Li J.,Shandong University of Technology | Chen J.,Shandong University of Technology | Wang Y.,FAW JIEFANG Qingdao Auto Factory
Advanced Materials Research | Year: 2012

Based on the vehicle dynamic model and it's parameters, the drive train arrangement is chosen composed of power batteries, an electric motor and transmission, and the components' performance parameters are determined according to the design requirement of performance indexes. The model of the electric vehicle is built, and the simulation and analysis of vehicle performance indexes, such as the ability to accelerate, top speed, climbing performance and the driving range, are conducted. The simulation results show that the performance index of the electric vehicle can fully meet the design requirement. © (2012) Trans Tech Publications, Switzerland.


Zhou L.,China North Engine Research Institute | Jia M.,Dalian University of Technology | Xu C.,China North Engine Research Institute | Zhou Q.,FAW JIEFANG Qingdao Auto Factory | Han J.,North University of China
Advanced Materials Research | Year: 2012

In this study the dynamic Smagorinsky model (DSM model) and an algebraic model for the subgrid turbulent kinetic energy have been implemented into KIVA3VLES code to investigate the atomization and evaporation processes of diesel spray in a constant volume vessel. Based on the experimental results of the liquid and vapor phase distributions as well as the results obtained by the differential subgrid scale kinetic energy (K-equation) model, the paper reveals the influence of the turbulent kinetic energy model on the fuel spray prediction. Computational results show that by combining the DSM model and the algebraic subgrid turbulent energy model, the turbulent diffusion of droplets can be reasonably simulated, the liquid penetration and the predicted liquid and fuel vapor mass fraction contours are close to the experiment results. At the same time, the turbulent kinetic energy given by the DSM model is in agreement with the results by the K-equation model, but with less computational cost. © (2012) Trans Tech Publications, Switzerland.


Li J.,Shandong University of Technology | Zhang G.,Shanghai JiaoTong University | Wang Y.,FAW JIEFANG Qingdao Auto Factory
Applied Mechanics and Materials | Year: 2012

A coordinated control strategy based on Direct Yaw Moment Control (DYC) and slip rate control was proposed aiming at improving vehicle stability. The system was divided into two layers: an upper layer and a lower layer. DYC was the upper-layer control, which calculates the additional yaw moment exerted on the vehicle based on the working condition of the vehicle. A simplified arithmetic of transferring additional yaw moment to desired slip rate was adopted in order to achieve differential braking. Slip rate controller was the lower-layer control that exerts braking force on the braking wheels to achieve the desired slip rate and to achieve desired yaw moment. © (2012) Trans Tech Publications, Switzerland.


Zhou L.,China North Engine Research Institute | Xie M.,Dalian University of Technology | Jia M.,Dalian University of Technology | Zhou Q.,FAW JIEFANG Qingdao Auto Factory | Xu C.,China North Engine Research Institute
SAE Technical Papers | Year: 2011

A large eddy simulation approach and different breakup models are used to analyze fuel injection and atomization processes in a constant volume combustion bomb. The study is focused on the influences of the subgrid turbulent kinetic energy, especially the source term induced by the fuel spray, on the droplet movement and spray characteristics. Furthermore, the influence of different subgrid scale (SGS) models, including the constant coefficient and dynamic Smagorinsky models, WALE model and the K-equation turbulent energy transport model, on fuel sprays and the turbulent dispersion of droplets are examined. Factors affecting the fuel spray are discussed based on numerical computations for various operating conditions and are compared with experimental data. Computational results show that the KH-RT breakup model is superior to the MTAB model, and both the subgrid turbulent energy source term induced by the spray and the turbulent dispersion of the droplets have important effects on the fuel spray, resulting in decreased spray penetration. The effect of the turbulent dispersion is found to be more prominent. © Copyright 2011 Society of Automotive Engineers of Japan, Inc. and SAE International.


Wang Y.,FAW Jiefang Qingdao Auto Factory | Dong R.,FAW Jiefang Qingdao Auto Factory | Wang S.,FAW Jiefang Qingdao Auto Factory | Zheng X.,FAW Jiefang Qingdao Auto Factory
Qiche Gongcheng/Automotive Engineering | Year: 2010

A road slope recognition algorithm based on SAE J1939 protocol is presented, which applies vehicle system dynamics to calculate road slope. Specifically, engine signals are obtained from SAE J1939 protocol first, based on this then, engine output torque and vehicle speed are calculated, finally road grade is obtained, and followed by data processing in accordance with the features of heavy truck. The results show that the algorithm is convenient, practical, efficient and accurate, meeting the requirements of vehicle AMT system.

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