Study And Implementation Of Estimation Algorithm On SOC For Electric Vehicle Battery

The prediction of state of charge(SOC) for storage battery is always a research hotspot and also a difficult problem. There were a lot of researchers who wanted to invent some methods to calculate the value of SOC accurately. But the actual results are all unacceptable although the laboratory findings are perfect. Traction battery is the active force of electromobile, and so we should to resolve the display problem of SOC on electromobile dashboard. When the electromobile runs on the bad road, the complex working environment for storage battery exacerbate the problem.I have studied some prediction algorithms to find a better one, and then developed an electromobile dashboard based on the finding algorithm. The dashboard also includes other display items as a complete one, and the knowledge of electromobile dashboard has been studied in depth, including the implementing methods of software and hardware about dashboard and the newest progress in instrument panel. The following is the main work I have done in this research.1) Some prediction algorithms have been discussed mainly in the front of the paper, also about their detailed principles, merits and demerits. Then I made a comparison about implementation difficult for these algorithms to find a lowcost and realizable method to display SOC preferably using a simple MCU.2) The main controller is MSP430F5437 in hardware frame aspect, and related peripherals gather, process and display the data under the control of the main controller. The informations, which should be displayed, consist of car speed, motor speed, remaining power(or SOC), current, remaining fuel, motor temperature and switching values. The detailed principles of the measuring and display circuits have been described in the hardware section and some considerations about PCB layout is referred too.3) The functions of this dashboard are discussed in the software chapter and so the related implementation methods are discussed too. The main contents of software chapter is composed of general software architecture, the thinking of software writing, the functions of some subfunctions, realizations of the some main subfunctions, and so on.4) The debug sector includes hardware debug, software debug and testing on the electromobile, each of them includes debugging precautions and debugging methods. Some problems have been found after debugging and the solutions are listed subsequently. Some shortcoming have been pointed out in the end, there are mainly about the research depth of SOC prediction and the design of dashboard. Then the development direction of this dashboard was stated.