Vehicle Intelligent Electric Power Network

Electric power is the basis for the normal operation of the automotive. As theraise of people’s needs for the comfort and entertainment of automotive, theelectric/electronic devices of automotive have been increasing rapidly, leading to someproblems, such as, over-discharge of the battery, increasing energy consumption,complexity of power supply wiring harness, reduced security of power supply anddifficulties in fault diagnosis. In order to solve these problems above, a vehicleintelligent electric power network is proposed in this paper, which is able to monitorall nodes of power’s generation, distribution and consumption in real time, acquirecomprehensive information of the entire electric power network in time, andintelligentize the automotive power supply system, and therefore, this new proposednetwork can effectively realize the battery management, energy optimization, electricpower usage safety, fault diagnosis and other issues.The overall architecture is established for the vehicle intelligent electric powernetwork. The network is made up of smart electric power system, strong electric powersupply network, and weak electric power supply network. The separated power supplyfor strong electricity and weak electricity provides a separate weak power andgrounding for controllers, avoiding the interference from strong electricity, which cangreatly improve the accuracy and stability of controlling, and furthermore, improve theentire system’s stability and reliability.The intelligent management for vehicle electric power system realizes the energyoptimization and battery management. Firstly, battery’s dynamic partition managementstrategy is established. According to different aging state, battery’s partition changesdynamically, and different management strategy is developed for different partitionintervals to achieve optimal battery power management; furthermore, the fuzzy controlstrategy for generator is developed by use of fuzzy control theory, realizing the batterymanagement and energy optimal management.Intelligent management for the strong electric power supply network is developed,to achieve optimal partition power supply and security management for all powerappliances on vehicle. Firstly, regions’ fault monitoring and protection method isestablished, achieves real-time fault diagnosis and protection for every electric power supply region; furthermore, electric/electronic device’s fault monitoring and protectionmethod realizes real-time fault diagnosis and protection for every electric/electronicdevice; in addition, fault diagnosis method for power supply wiring harness isdeveloped, in order to achieve real-time fault diagnosis for wiring harnesses’short-circuit, open circuit, and over temperature fault caused by leakage or prolongedoverload, and protection method is developed accordingly. This multiple-level faultdetection and protection method achieves the comprehensive security management ofthe entire strong electric power supply network.Weak electric power supply network manages and administrates the power supplyfor all the controllers. Firstly, classified and stable weak electric power supplyestablishes the optimized structure of weak electric power supply network; and then onthe basis of the optimized structure, the real-time fault detection method andmulti-layer protection mechanism for weak electric power supply are developed,realizing the security management for the entire weak electric power supply network.The vehicle intelligent electric power network prototype is developed based ontwo cars. Comprehensive function tests and plenty of road tests validate the feasibilityand reliability of the proposed vehicle intelligent electric power network.