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Changchun, China

Sui L.-G.,Jilin University | Sui L.-G.,Changchun Finance College | Liu Z.-C.,Jilin University | Han Y.-Q.,Jilin University | And 2 more authors.
Ranshao Kexue Yu Jishu/Journal of Combustion Science and Technology | Year: 2011

A simulation platform of turbocharged diesel engine with EGR loop under transient operations was completed and verified. In order to shorten the transient response time of EGR step change operation, different control strategies for EGR step change time, EGR open valve characteristic and target EGR rate were compared. Results show that shortening EGR step change time and adopting the upcast open valve characteristic control strategies can, on the one hand, improve the transient response of EGR flow mass rate, but, on the other hand, cause torque fluctuation. To reduce torque fluctuation, a comprehensive control strategy of EGR open valve characteristic was put forward, and the improved comprehensive control strategy function of different target EGR rate was defined. Compared with the linearity control strategy, EGR transient response time is reduced by 25%-40%, and its torque fluctuation is decreased by 10%-18% compared with the upcast control strategy. Source


Sui L.-G.,Jilin University | Sui L.-G.,Changchun Finance College | Liu Z.-C.,Jilin University | Han Y.-Q.,Jilin University | Tian J.,Jilin University
Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | Year: 2012

A typical operation modeling idea for the typical European transient cycle (ETC) was proposed. Composite transient rate is adopted as an input variable to establish the transient emission artificial neural network model. A complete process simulation platform of a turbocharged diesel engine under transient operations was made. Emission simulation of mode test cycle at different EGR rates and variable load operations at different transient rates confirm the accuracy and generality of the simulation platform. Simulation differences for steady state emission and transient emission are less than 3% and 4% respectively. Compared with the experimental data, the generalization simulation of transient emission trend is similar, and the maximum difference is 8%. The simulation platform can be applied to the control strategies of ETC typical transient operations. Source


Sui L.-G.,Jilin University | Sui L.-G.,Changchun Finance College | Liu Z.-C.,Jilin University | Han Y.-Q.,Jilin University | And 3 more authors.
ICCASM 2010 - 2010 International Conference on Computer Application and System Modeling, Proceedings | Year: 2010

Currently combustion and emission performance of diesel engine under transient conditions has become the researching focus. It's full of research challenges because of highly variability of engine operations and complexity of chemical reactions. A simulation platform of turbocharged diesel engine with EGR (exhaust gas recirculation) loop under transient conditions, based on the software coupling technique of GT-power and Matlab/Simulink, has been established. It simulated the EGR position step change transient operations and constant speed variable torque (CSVT) transient operation. Compared with the experimental results, it predicts the engine dynamics performance accurately. Based on this, the performance influences in three different kinds of fuel injection mass control strategies to the diesel engine under CSVT transient operation with EGR loop were discussed. It is shown that this simulation platform provides a new research method to improve transient diesel performance and explore control strategies of turbocharged diesel engine under transient conditions. © 2010 IEEE. Source


Liu J.,Changchun Finance College | Liu Z.G.,Volkswagen AG
Applied Mechanics and Materials | Year: 2013

The Agile supply chain is the requirement of automobile industry development. In front of the production from order and the variability of automobile market, the stock controlling methods and strategies are the important themes of manufacture factory and supplier. Basing on the feature of flexible production, the ABC/XYZ methods of stock controlling for automobile supply chain is studied in this paper. And different stock controlling strategies are also discussed. This method can not only reduce the depth of stock, but also improve the efficiency of supply chain. © (2013) Trans Tech Publications, Switzerland. Source


Sui L.,Jilin University | Sui L.,Changchun Finance College | Liu Z.,Jilin University | Han Y.,Jilin University | Tian J.,Jilin University
Frontiers in Energy | Year: 2013

In order to alleviate the pressure of experimental research of turbocharged diesel engine under transient operations, a whole process simulation platform for turbocharged diesel engine under transient operations was established based on the multi-software coupling technologies of Matlab/Simulink, GT-Power, STAR-CD and artificial neural network. Aimed at the contradiction of NOx and soot emission control with exhaust gas recirculation (EGR) of turbocharged diesel engine under transient operations, on this simulation platform, a transient EGR valve control strategy was proposed, which adjusted the EGR valve in adjacent level based on the feedback of its opening according soot control limit under transient operations. Simulation and experimental results prove that the transient emission optimization effect of this control strategy is obvious. On the one hand, compared with the previous control strategy, which closed the EGR valve during the whole transient operations, soot emission is slightly increased by 9.5%, but it is still 9% lower than the control limit. On the other hand, compared with the previous control strategy, NOx transient emission is reduced by 44%. © 2013 Higher Education Press and Springer-Verlag Berlin Heidelberg. Source

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