The Research Of An Intelligent Vehicle Power Management System

Along with the development of information construction and the improvement of combatantperformance, electric equipments of armored command vehicle are increasing, especially in theapplication of precision equipments, which puts forward higher requirements for the quality ofpower supply, monitoring protection and energy management. The management of vehiclepower supply is becoming more and more complicated, and the traditional power managementsystem has been not able to adapt to the new situation. As a result，the design of an effective andintelligent power management system has been in need.According to a certain type of armored command vehicle, this paper designs a kind ofdistributed power management system based on CAN bus communication structure. Usingmultiple independent output DC converters, the system provides a high quality power source tothe vehicle electrical equipments. It also designs a power monitoring module in order to monitorthe operational state of power converter of the main circuit in real time, and it realizes theintelligent analysis of the power supply fault. In order to monitor the battery remaining power inreal time and realize the management of battery power, a SOC estimation module is designed. Ahuman-computer interaction module is also designed so as to achieve a friendly man-machineinteraction function, which can display the information of lower system in real time.This paper designs the hardware and software in each module, and at the same time animproved Ah counting method of battery remaining power detection is proposed, whichcombines the method of open-circuit voltage and kalman filter. According to the establishmentof the second-order RC model and state space equations and using kalman filtering method andopen-circuit voltage to estimate the initial SOC value, this system solves the difficulity oftradtional Ah counting method in getting initial SOC value. At the same time, it adds thecharging and discharging efficiency compensation and temperature compensation to improveprecision of SOC algorithm.Finally, the paper designs a principle prototype of vehicle power supply managementsystem, and finishes the experiments of power module test, battery SOC estimates test and CAN display. The experimental results show that the stability of power management system is well,which is able to realize monitoring in real time and intellectualized management of the vehiclepower supply.