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The Tracking Control of Speed and Power of Apu for Series Hybrid Electrical Vehicle

Author: ZhaoXuGuang
Tutor: JiaoXiaoHong
School: Yanshan University
Course: Navigation,Guidance and Control
Keywords: Series Hybrid Electric Vehicle Auxiliary Power Unit Robust control Adaptive control L2-gain Backstepping Time delay
CLC: U469.7
Type: Master's thesis
Year: 2012
Downloads: 125
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Abstract


Energy depletion and Environmental pollution are the two big challenges facedby automobile industry in the 21st Century. Effectively combining advantages of thetraditional internal-combustion engine vehicle and pure electric vehicle, HybridElectric Vehicle (HEV) has become an practical technology to solve the two currentproblems. Served as an important part of HEV, Auxiliary Power Unit (APU) has vitalsignificance for energy conservation and emission reduction. Therefore, how to realizethe reasonable control of APU has proved to be one key technology for HEVdevelopment.This article mainly aims at the object of auxiliary power unit for SHEV, In orderto make engine working in high efficient economic area and the output of APU meetthe needed power, it has to set up mathematical model and have effective control ofAPU, and then realize the goals of energy saving and emission reduction.The control problem that auxiliary power unit recharges vehicle battery on amultiple constant current is studied. In view of the timing delay problem from the fuelinjection to output of engine torque, and taking into consideration the uncertainties ofthe system caused by changes in engine speed, parameter perturbation and externaldisturbance, robust output feedback stabilizing controllers are designed based onLyapunov-Krasovskii functional stability theory, nonliner backstepping design methoddecoupling control technique and L2-gain disturbance attenuation technique. Both thetheory demonstration and simulation results showed that the designed controller couldguarantee the stability and anti-interference performance in dynamic process of theAPU system, met the requirements of stability.Secondly, the tracking problem of APU for the target speed and power is studied.Firstly, According to the characteristics in actual operation, by taking into accountsystem parameter’s unboundedness and unpredictability、nonlinear and and externaldisturbance, nonlinear adaptive controllers are designed based on modern adaptivebackstepping design method and L2-gain disturbance attenuation technique. Theoretical analysis shows that the designed controllers can guarantee the stability andanti-interference performance in tracking process of the APU system. Simulationresults also verify the effectiveness of the proposed controllers.

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