Driveline Mode Switching Control Strategy For Parallel Hybrid Engineering Vehicles

Compared to traditional engineering vehicles, the engineering vehicle whichapplication of hybrid technology can reduce fossil fuels consumption and exhaustemissions, therefore research the application of hybrid technology in the field ofengineering vehicles have great significance to ease energy crisis and environmentalprotection.The hybrid engineering vehicles has two kinds of energy convert devices,engines and motors in different conditions using different modes of operation toreduce engine idling, increase engine loading rate, and recovery of braking energy asmuch as possible. Different dynamic characteristics between engine and motor in theprocess of mode switching will cause synthesis torque fluctuation and torque impact,torque fluctuation and torque impact affect the continuity of vehicle dynamics and thecomfort of drivers.Each chapter is as following:Chapter1Introduction. Overview hybrid technology and its significance ofapplying in the field of engineering vehicles, introduce the development situation ofhybrid engineering vehicles at home and abroad, summarized the key technology ofhybrid engineering vehicles and put forward the content of this article.Chapter2Transmission system operation mode and mode switching processcontrol strategy. First analyze the dynamic characteristics of engine and motor, andthen through the analysis of vehicle control strategy to determine the status of engineand motor under different working conditions. Finally, given the evaluation index ofdynamic coordinate control result, lay the foundation for the following study ofcontrol methods and simulation.Chapter3Dynamic coordination control algorithms of hybrid system. Thischapter discusses the composition of dynamic coordination control algorithms.Dynamic coordination control algorithm is based on engine of open loop control+engine torque estimated+motor torque compensation.Chapter4Dynamics modeling and simulation of hybrid wheel loadertransmission system. Use AVL/cruise to build a physical model of the hybrid wheelloader, control strategy model created by the MATLAB/Simulink and MATLAB/stateflow, through co-simulation on different platforms to research hybrid wheel loader mode switching process. Take impact strength as the main evaluation index,comparing to the simulation results without dynamic coordination control to show theeffectiveness of dynamic coordination control.Chapter5Summarize and prospects. Summarize the main research contents andresults, prospect further research.