Applied Mechanics and Materials Vols. 448-453

Abstract: A real-time mechanism as a level of electricity price is proposed to dispatch electric vehicle fast charging load. Considering the peak load shifting effect of grid, the benefit of charging station and the desire of customer, the mathematics model is built. And a genetic algorithm is used to solve this problem. Finally, a simulation based on an areas predicted data of year 2020 is made to show that the proposed method can lower the peak-valley difference, promise charging station benefit as well as meet customers desire, and achieve a win-win result.

Abstract: In this paper, the natural vibration characteristics of a hybrid vehicle powertrain are simulated. The nonlinear dynamic model is proposed by using the lumped parameter method, and the dynamic response characteristics of the powertrain with a wide range change of engine speed and torque are studied. The conclusions provide the basis for the system design and control strategies constituting of hybrid vehicle powertrain.

Abstract: Large-scale of electric vehicles (EVs) for charging will affect grid operation, disordered charging will have significant impact on the grid. This paper presents ordered charging mathematical model considering the smallest charging fees for EV users, a genetic algorithm is used to get optimization solutions. Monte Carlo method is used to simulate EV charging user behavior, analysis of disordered and ordered charging simulation results are compared under different charging mode. Simulation results show that ordered charging has huge roles in reducing the cost of user charge, reducing the peak-valley difference, improving load stability and users satisfaction. The results of example show the rationality of this model and algorithm.

Abstract: Power Spilt Device (PSD) is the key power component of Hybrid Electric Vehicle (HEV), and it affects dynamic performances and fuel consumption of HEV. The dynamic contact analysis of PSD gear train is difficult, as it is time-consuming and complex to set calculation parameters. This paper presents a method for dynamic contact analysis of PSD gear train using ABAQUS software. Three working conditions are chosen to simulate the dynamic contact pressure. The work in this paper provides an effective simulation method for obtaining dynamic contact characteristics of PSD gear meshing.

Abstract: It has been shown that none of any energy sources which own high specific energy or high specific power, but not both, can solely fulfil all the demands of hybrid electric vehicle (HEV) in some circumstances. In this paper a battery/ultra-capacitor hybrid energy storage system (B/UC HESS) using ultracapacitors which replace primary sole Ni-MH energy source, without any changes in other parts of HEV was presented. Based on the energy flow of energy storage system and operating status of the vehicle, a nonlinear proportional factor control strategy with a goal of improving battery life was introduced. The simulation results under different urban driving cycles show that the peak charge/discharge currents are smoothed effectively, which benefits the battery lifetime improvement. The results also show that the buffering effect of ultracapacitors has optimized the charging and discharging processes of Ni-MH battery considerably.

Abstract: The recovery of braking energy is an important characteristic of electric vehicles, and the technology of regenerative braking is one of the key technologies for electric vehicles. In this paper, after analyzing the main technical problems in regenerative braking of electric vehicles, the relevant research and development at home and abroad is introduced in detail, and its prospect of development is introduced at the end of this paper.

Abstract: The application of clean energy vehicles in urban transport affects not only the operational performance of the bus system but also the technology development for mobile industry, the energy consumption and emission level and the facility over its lifetime. With the survey data from 4cities in China (Jinan, Shanghai, Shenzhen and Chengdu), this article clarifies the policy environment and technology status, makes a policy assessment for the policies on promoting clean vehicles in China, analyzes the effectiveness of emission reduction cost and benefits, and proposes policy recommendations for promoting clean energy vehicles in place of the conventional vehicles in Chinese cities.

Abstract: Adaptive strategy of directed dynamical networks with switching topologies is proposed to eleminate the harmonic superposition, which is brought by the use of the electric vehicle chargeing spats. It is found that if there exists a directed spanning tree in the fixed time-average of network topology and the time-average is achieved sufficiently fast, then harmonic superposition of the network will be suppressed effectienly. A sufficient condition is derived. Several numerical simulations show the effectiveness of the adaptive strategy.

Abstract: Since there are many indexes of a car, we can t use a single index to evaluate the performance of a car. In order to fully evaluate the performance of a car, an evaluation index system of the automobile comprehensive performance was constructed from five aspects: dynamic performance, braking performance, operational stability, riding comfort and passing ability, economy and environmental protection. The evaluation model of the automobile comprehensive performance was established based on D-S evidence theory, which was applied to the evaluation of the automobile comprehensive performance based on the data from the questionnaire survey. The result of an analyzed example proved the theory to be effective and feasible.

Abstract: With the deterioration of the environment and energy crisis is becoming more and more serious, many countries have put forward the development of low-carbon automobile industry. China will also increase in the development of electric vehicle and related facilities as a national strategy. Construction and operation of the electric vehicle charging service network is the basic guarantee for the development of electric vehicle industry. Governments continue to strengthen support for the policy of charging facilities, and charging service network construction and operation scale and commercial degree increased gradually.