Advanced Materials Research Vols. 805-806

Abstract: Based on the current driving recorder with satellite positioning function technical standards, a pure electric vehicle driving state data collection terminal is designed in this paper. Through the interface technology, the terminal reads batteries, motor speed, current, power and other information of pure electric vehicles that is different from traditional driving recorder data from traditional power vehicles, and then establish the corresponding monitoring platform. Comparing the content of telematics services with the traditional vehicles and pure electric vehicles, this paper illustrates the basic application and market of pure electric vehicle driving state data collection terminal.

Abstract: New energy vehicles stand for the future development of automobile industry and all countries in the world increased national investment in new energy vehicles. This century, especially since the the Twelfth Five-Year period, China continued to increase supportive strength to new energy vehicles, to obtain better opportunities for development. This paper analyses the present situation of new energy vehicles and the problems should be paid attention to from the enterprise manufacturing technology, government policy and consumer. From the technology, industry and policy, the article investigates the development of new energy vehicles.

Abstract: Based on the technical standards for driving recorder with satellite positioning function, this paper designs a driving status data acquisition terminal for hybrid electric vehicle that could increase the data collection of battery, motor speed, current, power, etc. by the interface technology, and establishes appropriate monitoring platform at the same time. The test results show that, the driving status data acquisition terminal for hybrid electric vehicle meets to the application requirements.

Abstract: This paper propose the study of automobile active suspension system for the purpose of improving ride comfort to passengers and simultaneously improving the stability of vehicle by reducing vibration effects on suspension system. A fuzzy-logic-based control for vehicle-active suspension is suggested. The vehicle vibration and disturbance are reduced considerably with a fuzzy logic controller, to enhance comfort in riding faced with uncertain road terrains. A quarter-car active suspension system is controlled to reduce the vertical acceleration, suspension stroke and tire deflection. Simulation studies clearly demonstrate the effectiveness of the fuzzy logic controller for active suspension systems. The performance of the fuzzy logic controller under variations in the suspension component characteristics are also studied and are found to give reasonably good responses.

Abstract: Converter in EV (electric vehicle) charging-discharging-storage integration station must satisfy the correlation objects. These include: lower harmonic and higher energy conversion efficiency, benefits to battery life, adaption to different batteries, and adjustable charging current. In this paper, we propose a three-stage circuit topology, based on precise charging control, which is able to accomplish these goals on a lithium ion polymer battery pack. It is expected that the converter will also work well on other battery chemistries. In order to use three-stage converter to charge precisely, we need to first design each stage circuit and control strategy. The final strategy can accurately capture the voltage of each DC bus and the charging current of a cell. We also give the analysis of factors affecting battery life and energy conversion efficiency, whereby the three-stage converter is in practice. Comparing with charging simulations of batteries in conventional converter, those in three-stage converter are conducted. Results are presented that that it is possible to achieve more precise charging in integrality of battery charging and extension of battery life than the conventional converter expected in an implementation.

Abstract: The real-timely estimation of the SOC (state of charge) is the key technology in Li-ion battery management system. In this paper, to overcome the error of the SOC estimation of Extended Kalman filter (EKF), a new estimation method based on modified-strong tracking filter (MSTF) is applied to SOC estimation of Li-ion battery, based on the second-order RC equivalent circuit model. Experiments are made to compare the new filter with the EKF and Coulomb counting approach (Ah). The simulation results demonstrate that the new filter algorithm MSTF used in this paper has higher filtering accuracy under the same conditions.

Abstract: With the deterioration of the environment and energy crisis is becoming more and more serious, the development of low carbon industry has risen to national strategies. In the energy utilization and environmental effect, electric vehicle to the fuel vehicle has the advantages of energy saving and emission reduction prominent; the whole life cycle analysis, the electric vehicle complete life cycle into electric energy transmission cycle and vehicle life cycle of two parts; electric vehicle power battery as storage unit, strengthen the relationship between electric vehicle, new energy and smart grid among the three, promotes the development and application of clean energy, speed up the construction of smart grid, realize the real energy-saving and emission-reduction.

Abstract: Nanometric zinc oxide was prepared by the methods of precipitation and subsequent hydrothermal treatment, and used as an additive of a layered double hydroxide, [Ni₄Al (OH)₁₀]OH, to prepare the positive electrode of Nickel/metal hydride battery through mechanical blending. ZnO particles show sphere-like aggregates, and the particle size is around 100 nm in diameter. The influence on the electrochemical performance was investigated in positive electrode with different mass fraction of ZnO. The results indicate that the addition of ZnO can improve charge/discharge performances and electrochemical cyclic reversibility; also, elevate the oxygen evolution potential, decrease the double layer capacitance and the charge transfer resistance.

Abstract: When a large scale of plug-in electric vehicles connected to the grid,which will be bound to deteriorate the load curve and will affect the safe and stable operation of the grid without a reasonable means of control. Immune clone algorithm is applied to control the electric vehicles charging and discharging strategy and to develop a optimized scheduling scheme throughout the day. In this way not only can it avoid electric vehicles disorderly charging and discharging disorderly so that to optimize grid load curve, but also can reduce the loss of electric power lines and delay investment.

Abstract: Regenerative braking is one of the key technologies to improve the energy efficiency of electric automobile, but there is no available scientific method to evaluate the effectiveness of regenerative braking for electric automobile. The paper research regenerative system conformation and control strategy .An efficiency evaluation index of regenerative braking system is introduced based on brake energy flow model.