Motor Cooperative Control Of Dog Clutch Switching Process For I-AMT Of Electric Vehicle

In order to cope with global crises such as global warming,a wave of new energy has swept the world,and major changes have taken place in the automotive industry.It is imperative to replace fuel vehicles with full electrification.my country’s new energy vehicles are developing rapidly in the direction of electrification,intelligence,and networking.It is estimated that by 2035,pure electric vehicles will become the mainstream of new vehicles sold.The electric drive system is one of the core components of the electric vehicle.The electric vehicle is equipped with a two-speed gearbox,which can make the drive motor always run in a higher efficiency range,and the vehicle dynamics and economic performance are improved.In this paper,a new two-speed transmission(I-AMT)without power interruption based on a dog clutch is the research object,and the key role of the jaw clutch in the new two-speed gearbox is analyzed.The main work is to coordinate the control of the drive motor and the reverse gear actuator motor during the gear switching process to make the dog clutch smoothly and quickly combine and separate.Through the reverse gear actuator Catia modeling,motion force analysis,and Simulink vehicle modeling and simulation As well as bench and real vehicle experiments,the motor cooperative control strategy and the Smith predictor algorithm are studied.The simulation and experimental results show that the control strategy and algorithm developed in this paper can effectively reduce the impact of gear switching and ensure that the entire gearbox is in each gear.Switching between bits is smooth and the switching time is within a reasonable range.The specific work of this article is as follows:1.The general structural layout of the two-speed transmission and the power transmission routes of the first,second and reverse gears are introduced,and the reasons for the no power interruption of the up-down gears are explained.Through the working principle,mechanism movement and force analysis,the reverse gear mechanism based on the dog clutch is introduced in detail.This article divides the dog clutch switching process into two parts.After the reverse gear is engaged,the dog clutch engages After the process and the forward gear is engaged,the dog clutch is disengaged before the gearbox is raised to the second gear.In this paper,a detailed motor cooperative control strategy for the switching process of the dog clutch is formulated and the quality evaluation index of the switching process of the dog clutch is given.2.The control problems and difficulties in this article is introduced.Aiming at the response delay problem of the drive motor system,the Smith predictor algorithm is used to predict and compensate the control system,and the existence of the Smith predictor in Simulink is simulated to analyze the effect of the PID control.Influence,the effectiveness of the Smith predictor on the delay system is obtained.Since the Smith predictor has high requirements for the accuracy of the mathematical model of the control system,the system identification is used to obtain the system transfer function model.3.The controller,vehicle,and drive motor model are bulit by Simulink/Sim Driveline.When the vehicle is driving forward,the dog clutch is separated,the friction plate clutch is engaged,and the gear is switched to reverse gear before the upshift.The dog clutch is engaged in a simulation,and the gear switching coordinated control strategy is analyzed.4.A bench and a real vehicle experimental platform were built.Model-based design(MBD)technology is used to model the TCU application-level control algorithm,and the generated code is brushed to the single-chip microcomputer for testing using automatic code generation technology.The test results show that the motor coordinated control strategy and Smith’s prediction during the switching process of the jaw clutch The correctness and feasibility of the estimator algorithm.