Theresearch Of Control Strategy For HEV

Because of the shortage of oil resources and global warming, environmentalpollution problems such as growing, making more and more car manufacturers focus onthe development of low emission, low fuel consumption. HEV (Hybrid Electric Vehicle)-referred to as a Hybrid device. Hybrid vehicles, therefore, can make the engine keepthe best working state, good dynamic performance, and energy is clean energy, has thecharacteristics of the zero emission pollution.In order to realize a hybrid car low emissions, low fuel consumption, is a set offeasible control strategy. Therefore, according to the Shanghai automobile group,independent research and development of plug-in hybrid car platform as the prototype,and based on "innovation action plan" of Shanghai science and technology commission,to study the control strategy of hybrid electric vehicles. First on the key components ofthe original model analysis and selection, especially the key components of the hybridengine, electric motor and battery modeling and calculation, and the selection of hybridstructures were carefully analyzed. Then according to the key components of the vehiclearrangement and comparison with the original models to learn from other hybrid controlmethod using the relatively mature hybrid modeling software, finally adopts the methodof the forward simulation in matlab simulink model of the model is established.Control strategy is related to the performance and fuel economy of hev two coredirect influence factors of key indicators, in this paper deeply discusses the hybridprocess of start-stop of9main working state, and according to the requirements of eachstate the conditions of the conditions set to switch between each state, at last, throughthe simulation software for hybrid electric vehicle is used for modeling and simulation,the key research is mainly focused on the motor drive the car and rapid start-stopfunction of auxiliary power, by implementing fast start-stop function achieved thepurpose of reducing emissions, reduce oil consumption, and analyzed the hybrid cars ineach work mode of energy flow and torque distribution.In this paper, the first chapter discusses the background and significance of this topic research, and compares the domestic and foreign automobile industrydevelopment present situation in the field of hybrid cars, points out the importance ofthe study of hybrid electric vehicle., in the second chapter lists the this topic research ofhybrid electric vehicle by the target parameter, and expounds the current hybrid cars inhybrid mode contains the main working mode. The third chapter for a hybrid car engine,electric motor and batteries for the selection, according to the evaluation of a hybrid cara few key indicators and parameters analysis of the various key components, finallydetermine the component selection. In determining the working mode and in the fourthchapter, under the premise of selected key components, puts forward the main work inhybrid cars are driven in normal state, and according to the various working state set theswitch between each state conditions, the control strategy. After determine the controlstrategy, the fifth chapter focuses on the realization of the control strategy, first of all,according to the parameters of the various key components in the simulink formula foreach key components modeling, and the constraint condition is established. Finally inthe sixth chapter, according to a model building before the hybrid simulation software tothe operation condition of the hybrid electric vehicle in the simulation, the simulationresults can be seen that the hybrid selection of components and the control strategy canbetter achieve the performance indicators, is feasible.From the results, this paper proposed the hybrid control strategy can well simulatethe cars drive in the working condition of each state, can improve the fuel economy, notonly can run stably, and the reasonable, reliable and meet the actual needs.