Development Of Automotive Electronic Stability Program Simulation System

ESP is an active safety measure for automobiles.It mainly controls the output torque of the engine and the braking force of the wheel to keep the vehicle in a stable range.When the vehicle is turning,the yaw rate and the centroid side angle change.In this paper,it is important to suppress the centroid side angle error when the car is turn to dangerous conditions.The joint controller that designs the nonlinear change of the weight coefficient,and then develop the simulation system for ESP.The specific research contents are as follows:Firstly,analyze the existing automotive electronic stability program control methods and the advantages and disadvantages of the simulation methods.Construct the framework structure of the system,expound the system theory model,including constructing the whole vehicle model,tire model and auxiliary model,expound and select the model solving method,and establish the ESP upper and lower layer control model,aiming at the centroid of the car when turning to dangerous conditions.The suppression of the angular error is more important.The yaw rate and the centroid side declination controller of the nonlinear change of the design weight coefficient are designed to test the experimental conditions of the electronic stability program simulation system.Secondly,With VS2010 as the development platform,the vehicle electronic stability program simulation system was developed,and the advantages and disadvantages of the system were introduced.Specifically,the vehicle dynamics model,the hierarchical control model and the test conditions established above are programmed,and the interface is written in VS2010 to realize the functions of database import data,data storage,test condition setting,result output and simulation result display;A certain type of vehicle is selected,and sinusoidal hysteresis,Fishhook and other tests are carried out to analyze the centroid side yaw angle,yaw rate,the braking torque of each wheel and the change of the driving trajectory of the vehicle under the action of ESP.The results show that the peak yaw angular velocity decreases by 15% under step input,and the time to reach the peak decreases by 0.22 s.Under sinusoidal hysteresis input,the peak yaw angular velocity decreases by 29.8% and the time to reach the peak decreases by 0.55 s.Finally,analyze the application of the electronic stability program simulation system.Select a model,input the required parameters into the developed simulation system,and establish the vehicle model and control model in Carsim,set the simulation parameters,and compare and analyze the same working conditions(step input condition,sine input condition,Fishhook test).According to the calculation results under working conditions and sinusoidal hysteresis input conditions,the characteristic variables(yaw rate and centroid side declination)of the vehicle are selected to compare and analyze the change law,and the accuracy of the ESP simulation system is explained.