Real Time Simulation Method Research Of Automatic Transmission Driveline System

Abstract:Automobile's acceleration performance is one of the five performances, simulation acceleration accurately, especially in accelerating the process and its impact on the handling and stability has been one of research emphasis of vehicle dynamics modeling and simulation. Combination of the purpose of State Key Laboratory of Automotive Simulation in Jilin University to improve performance and simulation accuracy of the car simulator and extend dynamic model of application of working conditions, the details of this study is:By surveying driveline real-time modeling methods researched, proposed real-time driveline model which suited for driving simulator; The modular analysis of transmission system to achieve a unified interface module, through a unified interface to connect the various modules, driveline or internal model can be set up or replaced conveniently; By surveying typical Converter research and modeling methods, establishes torque converter model with torque converter clutch using stick-slip dynamic friction principle; Research comparing different types of limited slip differential modeling principles, and its impact on the handling and stability; By surveying typical differential modeling methods, describe the proposed method for different models respectively; Finally, contrast simulation with commercial software CarSim, verifying the correctness and accuracy of the model.Driveline System modeling methods researched. By surveying typical driveline model methods, analysis driveline phase based on the state of torque converter and transmission. Under different phases, explain motion state and the calculation of the restriction moment of the transmission and switch between different phases in detail analysis, based on the analysis in the phase, proposed 2-DOF power train model of this article. This paper has researched blocking driveline systems. Firstly, based on phase analysis, determine movement and torque transmitted between each module, which is the base of blocking and unified interface. Secondly, the parts have same function packaged as the same module, which is torque converter module, transmission module, transfer case module and differential module, module functions and uniform interface are defined, respectively.Torque converter modeling methods researched. By surveying typical torque converter research and modeling methods, Basing on this, Describes torque converter pump and turbine steady state performance using Curve, establishes torque converter clutch dynamic model using stick-slip dynamic friction principle; establish two-parameter automatic transmission shift schedule.Research limited slip differential modeling methods. By surveying typical differential (friction plate type, viscosity type, locked up type and active-controlled) modeling methods, analysis the principle effects of limited slip differential on the vehicle dynamics and driving stability, build different differential models respectively, and analysis differential's efforts to vehicle dynamics and driving stability.Simulate and verify driveline system model. Connect driveline system with engine model and a 7-DOF vehicle model as a 9-DOF dynamic model, program it in c language with visual studio software. Simulate standard Vehicle dynamic acceleration and handling stability working conditions, compared the model with commercial software CarSim, verify the established model is reasonable and accurate. As a modular extension, replace module one time quickly and easily for the dynamic or handling and stability working conditions simulation, analysis different types of driveline and differential forms how to influence the power and handling stability performance.