Experimental Verification And Development Of Synergic Electric System On HEV

With the research and development of hybrid electric vehicles(HEV) and electric vehicles(EV), the battery's performance becomes the key factor which plays a major role of vehicle's performance. Low battery power, high current, poor performance under low temperature environment and limited cycle life, are seriously hampering the new energy sources such as HEV and in-depth development of the market process. Super capacitor due to energy,cost constraints and other factors can not completely replace the original vehicle battery power. Under such background, people begin to consider a new kind storage device-Synergic Electric System (SES). Based on the "863" project, thought references to home and abroad direction of research and comparative studies, this paper gives a further research on SES.This paper has researched on the parameter match of SES on HEV, and the logic threshold control strategy, including filter and capacity electric quantity preservation thought, has been given. Then, this paper has designed the management system hardware and software based on the embedded system -- OSEK. At last, this paper developed a prototype of SES and test bench, verified the feasibility, then under cycle run conditions, the correctness of the algorithm has been tested.The paper includes following four aspects:1 The research on the analysis of the energy and power requirement and the parameters matching of SES. According to the vehicle configuration and performance requirements, the required energy and power can be calculated. With the power energy scale P/E, considering the weight, size and cost of project bounded, this paper calculated the parameters matching of SES. Through the analysis of the matching result, compared with parallel SES, the advantage of voluntary SES is verified.2 The research and simulation of SES Control Strategy. Based on the matching result, through the analysis of existing control strategy, the logic threshold power control strategy, including, filter and capacity electric quantity preservation thought, has been given. After simulation, the result showed that with SES the fuel economy increases 5%, and the efficiency of breaking energy recovery increases 11.2%.3 The Development of SES. Based on the requirement of SES, analyzing the input and output signals, this paper designed the management system hardware. First, the electronic circuit is designed; afterward it completed the PCB drawing, the electronic component welding and hardware debug. Through setting the interrupts and user tasks, this paper transplanted the embedded system -- OSEK to management system. Considering the code perform ability and anti-jamming design, this paper has completed the management system integration design and development through the final software and hardware union debugging.4 The experimental verification of SES. This paper developed a prototype of SES and test bench, and under cycle run conditions, the feasibility has been verified and the correctness of the algorithm has been tested. Compared with single battery and parallel SES, the change area of voltage and current of battery of voluntary SES is in evidence reduced, and the energy dissipation decreased 24.6%, which proves that system efficiency increases.