Advanced Materials Research Vols. 512-515

Abstract: To assure the safe transportation of bulk liquid chemicals by tankers at sea, not only it is required internationally that dedicated pressure relieving devices should be installed onboard, but the heights of the pressure reducing valves, the activating pressure are also prescribed numerically, although these are based on experiences gained. Actually, researching the relationship among the wind, including the direction and force, the tanker, including her course and speed, the height of an individual pressure reducing valve is more meaningful to improve the safety of lives and properties at sea. Based on plume model, the relationship above mentioned is researched, and the mathematical relation is also presented in this paper.

Abstract: Based on the Ackermann-Jeantand steering model, combined with the structure of the electric vehicle (EV), three different steering models are established .The speed of each wheel is calculated during the steering process based on these models. These function relationships are analyzed on MATLAB platform, and the results obtained show the availability and feasibility of these models. Finally, the travel environments of EV are pointed out in which three different steering models are fit respectively.

Abstract: Under the dual pressure of the energy and environmental protection， hybrid vehicles is becoming the mainstream of automotive industry development in the new century. In this paper,it is conducted theoretical research aimed at that hybrid electric vehicle powertrain control system (ISG).It is designed C8051F020 MCU for the electronic control unit (ECU), made the use of Hall sensors, through the signal acquisition, A/D conversion processing, multi-channel acquisition ECU determine the car's driving conditions and the analysis and calculation based on the amount of signal acquisition, respectively, to control the engine via the CAN bus, motor and battery to increase vehicle power, save fuel and reduce the amount of emissions purposes. It has design more reasonable ISG control system based on theory in the design.

Abstract: A new type hybrid power train system was developed for HEV, which can works as power coupling and transmission mechanism with three input shafts, one output shaft and fixed transmission ratios. The HEV adopting this new device can realize three operation modes: hybrid power driving mode, pure electric propulsion mode and electricity generation mode at vehicle stop condition. It can make engine work at optimum fuel consumption area, utilize motor to provide high start torque and realize modes conversion transform at probable rotation speed. The whole structure of this system is simple and easy manufactured, which can meet vehicle driving requirements at complicated conditions.

Abstract: Life cycle analysis provides global research methods for the assessment of life cycle performance. In this research, a WTW（well to wheel）model was introduced to study and compare the energy efficiency and CO₂ emissions from diesel bus, CNG bus and electric bus. The results show that the WTW total energy efficiency of diesel bus is 1790MJ/100km. The energy efficiency of CNG bus is 6% lower than that of diesel bus, while the energy efficiency of electric bus is 36% higher than that of diesel bus. Both CNG bus and electric bus show good potential of oil replacement with oil consumption decrease of 98% and 90%. As more than 80% of China’s electricity is produced by coal, electric bus has equal effect as CNG bus on CO₂ reduction. Compared to diesel bus, CO₂ emissions from new energy bus are reduced by 14%.

Abstract: Combined electric vehicles with smart grid, Vehicle-to-Grid (V2G) resolve the problem of charging large-scale electric vehicles, and make vehicles as mobile and distributed storage unit accessing to smart grid. V2G requires more efficient authentication protocol to meet fast response and information processing in real-time. Batch authentication can provide large computational savings when several signatures are verified together, which is appropriate for aggregators to verify PHEVs/PEVs. This paper proposes a modified batch authentication protocol based on hybrid cryptography, which takes advantage of public key cryptology to identity authentication and transmit shared session key. Furthermore, the comparison and analysis of the modified with existing batch authentication in V2G are given.

Abstract: In this paper, multidimensional evaluation model is made to select and analysis the new energy vehicles developing direction, namely to maturity, cost, energy resources, pollution and greenhouse gas emissions, energy efficiency and technical characteristics. And the research results show that, China should take the new energy vehicle technology line with "oil-electric hybrid, pure electric, improved hybrid- hydrogen fuel cell (hydrogen power), rechargeable hybrid" as the main line, and adjustment should be made with the technology innovation, industrial development, conditions and so on.

Abstract: Since the complicated configuration and nonlinear nature of the internal combustion engine (ICE/engine), it’s difficult to modeling with dynamic characteristic. Aimed to this problem, a method which associates testing data with control theory for engine is presented. For the engine output is always link up generator in the hybrid electric drive vehicle, the work looks them as a whole and establishes the simulation model of engine-generator based on BP neural network and inertia element. The approach of how to computer parameters are introduced detailed. The simulation and experiment results indicated that the model’s performance data is consistent with the actual engine-generator very well.

Abstract: The complex and unstructured working environment of all-terrain vehicle cause large resistance when they are turning. The turning power which affects a lot on the mobility of all-terrain vehicle is much larger than the power in running straight. In this paper, a series hybrid power system of an all-terrain fire robot was discussed, the turning model of the robot is simplified to 2D mechanical model, force analysis was made, a power formula in which the power is only related to the drag coefficient and relative turning radius was derived, and a dynamic model based on the driving power of lateral side and the braking power of medial side has been set up, simulation has been made in the condition of paddy field, hard soil road and asphalt road, the simulation reults shows the characteristic curve of driving power and baking power in turning, and the extreme power needed in turnning have been found.

Abstract: This paper analyzed the feasibility of development and utilization of four kinds of renewable energy sources which are wind energy, wave energy and ocean current energy, solar energy and gave some specific recommendations about the use of wind power. The richness of four kinds of energy sources and some problems about the cost, reliability, installation, utilization and maintenance were systematically investigated. Studies have shown that on the coral reefs solar power generation has the more feasibility than wind power generation, and wave power generation and marine power generation have no feasibility within future ten years.