Advanced Materials Research Vols. 724-725

Abstract: In accordance with ECE-R-13 braking regulations limit line, a regenerative braking control strategy is proposed to improve the braking energy recovery. Based on a Electric Vehicle, the braking distribution method makes the front and rear axle braking force arbitrarily distributed which is more effective to improve the rate of energy recovery. Simulation results show that this braking force distribution method focuses on making the braking force distribute to the drive shaft to a maximum extent and can decrease the vehicle fuel consumption.

Abstract: APU(Auxiliary Power Unit) control strategy was designed by the target of actual output power following the demanded power and the fuel consumption minimum. The preset demanded power of the entire vehicle has been decoupling controlled, using PID control algorithm to control the speed of the engine and vector control algorithm to control torque of generator, to realize decoupling control of the demanded power. Simulation result and bench test verified control strategy and achieved the goal of vehicle fuel saving 20% by nine “NEDC” cycles.

Abstract: Based on the analysis of heat mechanism of the lithium-ion battery, the thermal properties on specific heat capacity and thermal conductivity were obtained by experiment , and then established thermal model of the monomer battery. Moreover, to verify the correctness of the model and get temperature field distribution, the heat simulation of it by using ANSYS Fluent software was conducted, After that, the monomer battery was grouped into five, then the simulation analysis of the grouped battery was done on the case of natural convection and forced convection. Finally, we verified the validity of the simulation by experiment.

Abstract: The research and industrialized development of new energy vehicle is drawing more and more attention from a point of view in the scope of the world. This article, based on actual situation of new energy vehicle development in China, applying SWOT analysis to analyze the strengths, weakness, opportunities and threats of new energy vehicle industry. Finally, it makes recommendations to enhance the competitiveness for the new energy automotive industry.

Abstract: The lean burn technology has been paid attention recently by more and more people because the economics and emission of the gasoline engine can been improved extensively by lean burn technology. However, the reduction of NOx emission is quite small because of the rich oxygen. The different combination schemes of NOx adsorber and Three Way Catalyst were adopted in this paper and experiments of reduction NOx emission have been studied in an modified EFI 16 valves lean burn gasoline engine . The experiment results show that the scheme of the position of Three Way Catalyst is before the NOx adsorber Catalyst was the best scheme of reduction NOx emission in lean burn gasoline engine.

Abstract: According to power capacity shortage and harmonic pollution caused by the development of electric vehicles (EV), a photovoltaic (PV) charging system with the function of active power filter (APF) is designed. The system could provide charging power and harmonic compensation for electric vehicle charging machines at the same time. When sunlight is insufficient the PV charging system could continue to work in APF mode. In this paper, detailed analyses of system structure and control algorithms are given. Finally, the proposed system is simulated in PSCAD/EMTDC, and the simulation results validate the correctness and feasibility.

Abstract: The SWH system, which refers to solar water heating system, is getting popular in recent years. Despite the wide range of application, the incorporate design of SWH system with high-rise residential building stays problematic due to the lack of comprehensive design and calculation system, there is much to be improved in terms of programming, system and parameter selection, calculation system and the management of the SWH system. This paper mainly discusses the principle of design and calculation of SWH system, a real high-rise residential building project in the city of Guilin is set as an example .With the help of it, the design of SWH system in the stage of blueprint, the selection of hot water system and climate data, the calculation method of SWH system, and the importance and necessity of using monthly-based data to design the SWH system will be elaborated in detail. This paper also expects to be helpful to the construction of other SWH projects in China.

Abstract: Applied FLUENT simulation software to research the influence of tunnel length, tunnel entrance velocity, tunnel equivalent diameter and tunnel buried depth four important factors on the tunnel wind cooling system in Shenyang area. The results show that, with the increase of tunnel length and tunnel buried depth and with the decrease of tunnel entrance velocity and tunnel equivalent diameter, the outdoor air which passed into the tunnel cooling amplitude increases. For the tunnel wind cooling system optimization design in Shenyang area and the surrounding areas, the advices are that tunnel buried depth should not be more than 6m and tunnel entrance velocity should not be more than 5m/s.

Abstract: With increasing land prices and a lack of space in urban areas in the Republic of Korea, urban construction sites require deeper and larger excavations. For this reason, the selection of an adequate retaining wall system is becoming more important than any other aspect of excavation work. Cast-in Place pile (CIP) method, one of construction methods for retaining walls, is generally selected in excavation work for urban projects. CIP has some disadvantages such as additional waterproof work and environmental. The Pre-stressed High-strength Concrete (PHC) pile method is a solution that attempts to resolve these disadvantages of the CIP method. This study aims to compare the CIP and the PHC method in terms of cost and time. It was found that applying the PHC pile method could reduce cost and time compared to CIP by case study.

Abstract: Based on the foundation of heat conduction equation, this paper analyses the Yellow River bridge liujiaxia anchorage of mass concrete temperature field and stress field in the natural cooling and stratified pouring time interval for 7 days to circumstances with the MIDAS/CIVIL finite element software. The results show that the interval 7 days stratified pouring and natural cooling method, can't meet the requirements of concrete anti-crack.