Coordinate Control of Mode Switch for Differential Couping Hybrid Electric Vehicle
|Keywords||differential coupling hybrid electric vehicle hybrid type mode switching dynamic coordinated control|
Differential coupling for power system equipped with this new hybrid electric vehicle hybrid type encountered during the development of coordinated control problem of dynamic analysis, this problem is gradually developed in the course of the actual vehicle being taken seriously, especially mode switching of this dynamic process, and if ignored will result in vehicle dynamic coordinated control of the power interruption, or have a huge impact, which will seriously affect the durability of hybrid vehicles, power and comfort. So the hybrid car has a good dynamic coordinated control is a hybrid vehicle from the pilot phase to the practical stage of the important technologies.The research projects mainly supported by National Natural Science Foundation project "a new hybrid system, hybrid drive mechanism and control theory," as the basis, some research work carried out as follows:First, this paper analyzes not only the system of coupled differential characteristics of hybrid automobile, but also the system of the engine, motor, generator coupled dynamic characteristics and the differential characteristics of dynamic systems, but also gives the coordinated control mode switching effect of the impact of the degree evaluation, but also for subsequent chapters on the mode switch of the foundation.Second, differential coupling in hybrid vehicles in the actual operation of all the models analyzed in detail, and a comprehensive introduction to one of 12 different operating modes. The process of switching the mode into the mode with the engine start and engine start is not with the model, and analyzes whether the engine switch in the pattern from the location, helping to establish the dynamic coordinated control algorithm and steady state control model of the structures.Third, the paper analyzed the engine, motor and generator mode switch changes the state of the process and to determine the mode of switching the target torque of each power source. Differential coupling of the hybrid electric vehicle dynamic analysis of the overall structure, and proposed "closed-loop torque motors and generators+the open-loop engine torque motor torque compensation+generator on the engine torque adjustment" dynamic coordination algorithm and determine the target torque of the motor torque compensation, the generator target torque of the engine control and the rate of change of the three major power source for the slope of the torque control algorithm, control strategy for the future to build dynamic model provides a theoretical basis.Fourth, the use of AVL/Cruise differential built-in hybrid vehicle coupled physical model of vehicle, and according to the Toyota Prius (Pruis) hybrid vehicle physical model parameters to configure the vehicle, including engines, motors and generator parameters. Re-use Matlab/simulink control model of steady-state structures and the vehicle dynamic control model, steady-state control model include: vehicle demand torque calculation module, torque distribution modules, and by the Matlab/state of the structures of the mode switch module; News torque compensation control module includes three main power source module and the rate of change of the slope of the torque control module in two parts. Use of two software interface that comes coupled differential joint simulation of hybrid vehicles, and several representative switching between modes to simulate and analyze the degree by the impact of fuel economy values and the comparison to verify the coupled differential before the hybrid car mode switching process is dynamic coordination of the feasibility and effectiveness of thought control.In summary, this paper differential mode coupling in hybrid vehicles were optimized switching proposed differential coupling system for the dynamic coordination of control theory, model evaluation and the corresponding switching control strategy and its experimental verification. This paper will certainly make its findings coupled differential hybrid vehicles from the pilot phase to the industrialization phase one step further.