DocumentCode :
3435187
Title :
Reliability improvement of electric power steering system based on ISO 26262
Author :
Xuewu Ji ; Jingguang Ge ; Hongliang Tian
Author_Institution :
State Key Lab. of Automotive Safety & Energy, Tsinghua Univ., Beijing, China
fYear :
2013
fDate :
15-18 July 2013
Firstpage :
125
Lastpage :
129
Abstract :
Electric power steering (EPS) systems have been more and more widely used in medium and large cars. As a safety-critical system, its safety and reliability are uttermost important. ISO 26262 adapted from IEC 61508 provides a V-model as a reference process model for different phases of product development. In this paper, DFMEA (design failure mode and effects analysis) and FTA (fault tree analysis) complied with ISO 26262 are taken to analyze the safety aspects of EPS so as to enhance the safety and reliability of EPS. Firstly, the EPS system is decomposed into subsystems and components, and the familiar failure modes and undesired top events are separately divided into several categories. Then a comprehensive DFMEA for every single potential failure mode is carried out without omission as far as possible. The qualitative FTA is put into practice to identify the weak link as well. Since the DFMEA and FTA for EPS are finished, countermeasures for each potential hazard should be taken to guarantee the safety and reliability of EPS which are always achieved by fault detection and fault isolation algorithms of EPS hardware and software. Besides, some preventive actions are also taken in the early design stage to find out the potential causes.
Keywords :
IEC standards; ISO standards; automotive components; fault diagnosis; fault trees; hazards; road safety; steering systems; DFMEA; EPS hardware; EPS software; EPS system; FTA; IEC 61508; ISO 26262; V-model; car; design failure mode and effects analysis; electric power steering system; fault detection algorithm; fault isolation algorithm; fault tree analysis; hazard; product development; reference process model; reliability improvement; safetycritical system; Automotive engineering; ISO standards; Power systems; Reliability engineering; Safety; Torque; DFMEA; EPS; FTA; ISO 26262; preventive actions; system structure tree;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Quality, Reliability, Risk, Maintenance, and Safety Engineering (QR2MSE), 2013 International Conference on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4799-1014-4
Type :
conf
DOI :
10.1109/QR2MSE.2013.6625550
Filename :
6625550
Link To Document :
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