Simulation Study Of The Auxiliary Power Unit And Its Control System In Series HEV

Energy depletion and environmental pollution problems have becomeincreasingly prominent, so that the development of the traditional vehicle is facingunprecedented bafflement. In order to conserve oil resources, improve energyefficiency and improve the urban pollution emissions, hybrid electric vehicle (HEV)has become the research hotspot. HEV uses the internal combustion engine andelectric motor as power sources to drive the vehicle. By optimizing the control of theenergy distribution between engine and electric motor, it is ensured that engine canwork in high-performance areas to achieve the purposes of reducing fuelconsumption and emissions. Auxiliary power unit (APU) as an important componentof hybrid electric vehicle has important significance on energy-saving emissionreduction for vehicles. Thus, the problem how to effectively control the APU hasbecome the urgent need to resolve one of the key technologies in the process ofresearch on hybrid systems.Aiming at one of the key technologies of hybrid electric vehicles—the controlof APU , this article has done research on it, by using GT-SUITE simulation tools,dSPACE simulation platform and V mode of the modern electronic control moduledevelopment process.Firstly introduced the present development of hybrid electric vehicles, V modeof modern electronic control modules and the development of hardware in-the-loopsimulation (HILS), and then expounded the purpose and significance of the study atlast put forward the contents of study.Major modeling the engine used in seriers hybrid electric vehicle (SHEV) bythe GT-Power professional simulation tools, then recording the engine performancedata by simulation, last using GT-Drive, the vehicle modeling tool, to set up APUmodel.Then it formulated the APU control strategies referring to the APU work modes.Then it introduced the modeling process of control unit of the APU in SHEV, andestablished the Matlab/Simulink simulation model for APU controller, according tothe designed control strategies. Finally united simulation experiments by using ofMatlab/Simulink and the GT-Drive. The experiments results showed the designedcontrol strategies can control the APU, and it has laid a good foundation for thecontrol system of APU.Finally, it established the models of APU based on the graphics modeling toolMatlab/Simulink. Controller hardware designed basing on the self-developed S12experiment board. The control program is according to the control strategies thatwere verified in chapter III. Finally, carrying on the hardware in loop simulation ofAPU control system by using dSPACE simulation platform, the simulation resultsshowed that the physical APU controller can control the APU work well.