Research On Automotive ESP Diagnostic Methods And Control Logic

Automotive ESP system currently as the world’s most important active safety system, can greatly improve vehicle handling on high speed, stability in emergency conditions, braking safety, which would significantly reduce vehicle instability to avoid major traffic accidents due to high speed,so it is the reliable guarantee for crew and their property safety. Therefore, more and more countriestake automotive ESP system as a mandatory standard configuration for new automotive sale market.ESP system consists of three parts: sensor, controller and actuator. The sensor part offers original input signals to entire control system, the validity and accuracy of its inputs are prerequisite for the entire control system’s effectiveness and accuracy, if the original input turn out offset or error, can cause ESP system mistakenly trigger or misuse, that would cause terrible traffic accidents! Obvously, ESP sensor signals fault diagnosis is particularly important, this articlewill explore this part of ESP system sensor fault diagnosis methos and its control strategy.This article’s containing is as follows:First chapter. Introduce the research background and development in theworld of automotive ESP system, the composition of it’s significance for ESPsystem fault diagnosis and the application status at home and abroad, and finally introduce the main contents of this article.Chapter Two, vehicle with ESP kinematics model is established. Vehicleparameters to determine the kinematic model of the ESP system according to one A0-class car, and kinematic features in the vehicle at high speeds, brakingcharacteristics and steering characteristics. Build the ESP vehicle kinematics m odel based on Matlab/Simulink software, and set simulation environment of theESP test in Ve-DYNA software.Chapter Three, ESP fault injection and fault identification methods research. Actual practice with the current automotive engineering applications of the ESP to improve research in engineering applications, this paper adopts a model-based sensor signal estimation method using the Ackmann two degrees of freedom vehicle model and uniaxial simplify vehicle model. From vehicle side to the dynamic characteristics of the derivation of the kinematic correlation betweenthe ESP sensor signals, the establishment of the estimation model of the sensor signal; use redundant signal and residual control of the threshold method toestablish the fast and accurate fault recognition model in simulink. With previous studies of vehicle ESP dynamic model successfully docking, Ve-DYNA vehicle dynamics simulation software, will contain fault injection and fault recognition model ESP vehicle model to connect to the Ve-DYNA ESP Experimental assessment of working conditions and environment, based on simulation data, verify the feasibility and accuracy of the estimate for this fault diagnosis methods.Chapter Four, ESP fault processing algorithms research. This part shows the detailed analysis of ESP system hardware modules and the three form partof sensor, controller, actuator and various components of the correlation between ESP system is derived in the hardware part of the sensor signal part. Whenfailure occurs how to design which software modules would shutdown its logic.In Ve-DYNA, combined with the established vehicle ESP model simulation before,during ESP test conditions after joining the fault processing algorithms, based on extensive simulation data to verify the feasibility and accuracy of processing algorithms for ESP sensor failures.Chapter Five, based on UDS automobile ESP diagnostic communicationsand management. The same to actual integration with the current ESP fault diagnosis engineering applications, this article discusses in detail the mainstream o f the current automotive electronic control field of fault diagnosis protocol, UDS on CAN communication mechanism and fault codes define. Combined UDSdiagnostic protocol and ISO11898protocol for fault code the presentation, scheduling and communications management system developed for automotive ESPfault code. Discusses the overall framework and design the entire automotiveESP system fault diagnosis software.Chapter Six, summary and outlook. Summarized the whole artice and limitations of the analysis during the research, and make recommendations for thefurther research.