This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Development of Electrical Power Assisted Steering (EPAS) Considering Safety and Reliability Aspects as per ISO 26262
Technical Paper
2015-26-0086
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Electric Power Assist Steering (EPAS) is a safety critical system because it affects vehicle stability and dynamics. In EPAS, electric motor takes the power from the battery and delivers this power to rack and pinion only on demand. Since EPAS contains electrical component such as Motor and electronic component such as Electronic Control Unit (ECU), reliability of these components is very important. To ensure safety and reliability, ISO 26262 standards are adapted which are derived from IEC 61508. This standard regulates the product development on system, hardware and software level and manages functional safety for electrical and electronic components.
This paper discusses the applicability of the ISO 26262 standard to the development of EPAS ECU with respect to its hardware and software design. Hazard analysis and risk assessment of the basic EPAS architecture is performed and architecture is improved to achieve safety goal as per the standard. Reliability analysis of the new architecture is done using fault tree analysis (FTA) and failure mode and effect analysis (FMEA). This reliability analysis helped us in identifying new functional and non-functional hazards in the system on which we can take preventive measures and achieve our safety goal.
Recommended Content
| Journal Article | Functional Safety Compliant ECU Design for Electro-Mechanical Brake (EMB) System |
| Ground Vehicle Standard | Class B Data Communications Network Interface |
| Technical Paper | The Fault Assumptions in Distributed Integrated Architectures |
Authors
Topic
Citation
Srivastava, P., Karle, M., Shailesh Karle, U., and Deshpande, A., "Development of Electrical Power Assisted Steering (EPAS) Considering Safety and Reliability Aspects as per ISO 26262," SAE Technical Paper 2015-26-0086, 2015, https://doi.org/10.4271/2015-26-0086.Also In
References
- He , Z. and Gu , M. Dynamic Research on Control Strategy of Electric Power Steering System SAE Technical Paper 2012-01-0212 2012 10.4271/2012-01-0212
- Kurishige , M. , Tanaka , H. , Inoue , N. , Tsutsumi , K. et al. An EPS Control Strategy to Improve Steering Maneuverability on Slippery Roads SAE Technical Paper 2002-01-0618 2002 10.4271/2002-01-0618
- Jacob , P. Design & Safety Considerations for Electrical Power Steering (EPS) Systems Based on Automotive Safety Integrity Levels SAE Technical Paper 2010-01-0994 2010 10.4271/2010-01-0994
- Ji Xuewu ; Ge Jingguang ; Tian Hongliang Reliability improvement of electric power steering system based on ISO 26262 Quality, Reliability, Risk, Maintenance, and Safety Engineering (QR2MSE), 2013 International Conference on 125 129 15 18 July 2013 10.1109/QR2MSE.2013.6625550
- Kwon Hyungju ; Itabashi-Campbell , R. ; McLaughlin , K. ISO26262 application to electric steering development with a focus on Hazard Analysis Systems Conference (SysCon), 2013 IEEE International 655 661 15 18 April 2013 10.1109/SysCon.2013.6549952
- ISO 26262, Road Vehicles-Functional Safety 2011
- Goddard , P. System Safety Applied To Vehicle Design SAE Int. J. Passeng. Cars - Mech. Syst. 2 1 1 97 2009 10.4271/2008-01-2680
- Koren , I. , and Krishna K. M. Fault-Tolerant Systems Morgan Kaufmann 2007
- Vesely W. E. and Roberts N. H. Fault Tree Handbook Nuclear Regulatory Commission 1987
- Sinha , P. Architectural design and reliability analysis of a fail-operational brake-by-wire system from ISO 26262 perspectives Reliability Engineering and System Safety 2011 10.1016/j.ress.2011.03.013