Research On Four-quadrant Transducer Modeling Method For Hybrid Vehicles And Its Control Strategy

The energy crisis is currently an important factor that constrains the development of modern industry,and the automobile industry is one of the major destinations of energy consumption.Therefore,it is of great strategic importance to carry out energy-saving research on automobiles.The four-quadrant hybrid system is a novel drive system for HEV.With its compact structure and excellent serial-parallel hybrid system performance,it has become one of the most competitive ideal systems in the HEV field.The four-quadrant transducer(4QT)is the core component of the four-quadrant hybrid system.Because of its dual-rotor structure,the modeling and control methods for 4QT are relatively complex.This article takes 4QT as the research object,and conducts the following research from several aspects of the underlying modeling,speed control,and power optimization strategies.Firstly,the 4QT magnetic circuit model and the finite element model are established.Based on this,magnetic circuit and magnetic fluxes are analyzed respectively.The magnetic field coupling in the 4QT is analyzed,and the conclusion is drawn that the magnetic coupling between the inner and outer equivalent motor is low.Based on the above conclusions,"space isolation method" is proposed and used to decouple the mechanical structure of a 4QT to obtain a decoupled model of 4QT that can be equivalent to two conventional motor structures,and verified by theoretical verification and simulation experiments.The correctness of the model provides a basis for the simplification of the 4QT model and control.Based on the equivalent motor model established by the "space isolation method",a position sensorless speed control system based on sliding mode observer is designed for 4QT.This system avoids the problems of large size and poor reliability caused by speed sensors.4QT position sensorless speed control system simulation model based on sliding mode observer is established.The effects of the sliding mode observer on speed and position observation,and the speed control performance and stability of the control system are tested.This verifies the feasibility of independent control of the 4QT dual-rotor motor.A variable structure control strategy based on fuzzy control for four-quadrant hybrid power system is proposed.The internal power flow of the four-quadrant hybrid power system is analyzed,and the membership functions and fuzzy rules of the fuzzy controller are designed.Combined with this control strategy,a four-quadrant hybrid power system simulation model is built to simulate the control effect under different operating conditions.The result verifies the correctness of the variable structure control strategy of the four-quadrant hybrid power system based on fuzzy control.