Research On Powertrain Matching And Torque Control Strategy For Distributed Mining Hybrid Electric Truck

Along with the continuous development of the national economy and the increasing of infrastructure construction investment,mining scale of coal and cement is becoming bigger and bigger.The mining groups are very desired to have the mining truck which can improve transport efficiency and reduce the transportation cost.This thesis is based on the cooperative project between university and company which is focus on the hybrid system for mining truck.In view of lacking power and front axle slippage when full loaded mining truck is climbing,research focus on powertrian matching and torque control of distributed mining hybrid electric truck is carried out in this thesis.The advantages and disadvantages of different hybrid structures are analyzed and the distributed hybrid system structure whose front axle is driven by electric motor and two rear axles are driven by engine is chosen.To meet the requirement of the vehicle power performance,the type and the parameters of the main component for distributed hybrid system is matched through vehicle longitudinal dynamics calculation,.The working mode of distributed hybrid system is divided according to the energy flow type.The switch strategy of different working mode is designed according to the characteristics of hybrid system's main components.Based on the calculation of driver's torque requirement,torque distribution strategy of different working modes is established.To avoid the excessive slip of front wheel,PID anti-slip control strategy is designed based on slip ratio.The vehicle longitudinal dynamics simulation models of traditional minging truck vehicle and distributed mining hybrid electric truck are established with AVL-Cruise respectively.Working mode switching logic model,torque distribution control model and anti-slip regulation control strategy model are established based on MATALB/Simulink.Co-simulation between AVL-Cruise and MATLAB/Simulink is conducted to verify the dynamic performance and fuel economy of distributed mining hybrid electric truck.Compared with the traditional mining truck,the max velocity of the distributed mining hybrid electric truck at 12% slope is increased by 21.7%,the fuel consumption is reduced by 13.5%.Meanwhile,the slip ratio of front wheel can be limited to the expected range when front wheel slip happened.After that,the ratio of front axle reducer and the ratio of commonly used transmission gear are chosen as optimization variables,co-optimization between Isight and AVL-Cruise is conducted.The fuel economy of distributed mining hybrid electric truck is improved additionally.Finally,vehicle dynamic performance test is conducted with trial-manufactured prototype of distributed mining hybrid electric truck,and the improvement of dynamic performance is verified.Aimed at the problems happened with traditional mining truck,the research on parameter matching,control strategy and simulation for distributed hybrid system is conducted in this thesis.This thesis can provide some reference to the hybrid system application in mining truck.