Functional safety management aspects in testing of automotive safety concern systems (electronic braking system)

The Distributed Electro-hydraulic Braking system (DEHB) is a wet type brake-by-wire system. As a safety critical automotive electrical and/or electronic (E/E) system, DEHB shall be designed under the guideline of ISO 26262 in order to avoid unreasonable risk due to the malfunctions in the item. This paper explores how the Automotive Safety Integrity Level (ASIL) decomposition in the concept phase is influenced by the system architectures of DEHB. Based on a typical hazardous event, analysis on DEHB with the same system architecture as the Electro-mechanical Braking system (EMB) is carried out, which is taken as the basis for comparison. Two types of DEHB with different system architectures are then analyzed. Results show that the adoption of hydraulic backup enables ASIL decomposition in the pedal unit. The adoption of both hydraulic backup and normally open balance valves offers the opportunity to perform ASIL decomposition in the brake actuator system of DEHB.

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Integrated project and functional safety management—a way to increased quality of safety instrumented system design

Safety and Reliability of Complex Engineered Systems ◽

10.1201/b19094-454 ◽

2015 ◽

pp. 3447-3454

Author(s):

H Dahl-Olsen ◽

A Lauvsnes ◽

T Leinum ◽

A Casal

Keyword(s):

System Design ◽

Safety Management ◽

Functional Safety ◽

Integrated Project

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A Novel Hazard Analysis and Risk Assessment Approach for Road Vehicle Functional Safety through Integrating STPA with FMEA

Applied Sciences ◽

10.3390/app10217400 ◽

2020 ◽

Vol 10 (21) ◽

pp. 7400

Author(s):

Lei Chen ◽

Jian Jiao ◽

Tingdi Zhao

Keyword(s):

Risk Assessment ◽

Process Analysis ◽

Hazard Analysis ◽

International Standards ◽

Functional Safety ◽

Road Vehicles ◽

Effect Analysis ◽

Automotive Safety ◽

Safety Requirements ◽

Assessment Approach

ISO26262: 2018 is an international functional safety standard for electrical and/or electronic (E/E) systems within road vehicles. It provides appropriate safety requirements for road vehicles to avoid unreasonable residual risk according to automotive safety integrity levels (ASILs) derived from hazard analysis and risk assessment (HARA) required in the ISO26262 concept phase. Systems theoretic process analysis (STPA) seems to be designed specifically to deal with hazard analysis of modern complex systems, but it does not include risk evaluation required by most safety related international standards. So we integrated STPA into Failure Mode and Effect Analysis (FMEA) template to form a new method called system theoretic process analysis based on an FMEA template, STPAFT for shot, which could not only meet all the requirements of the concept phase in ISO26262, but also make full use of the advantages of the two methods. Through the focus of FMEA on low-level components, STPAFT can obtain more detailed causal factors (CFs), which is very helpful for derivation of safety goals (SGs) and the functional safety requirements (FSRs) in the concept phase of ISO26262. The application of STPAFT is described by the case study of fuel level estimation and display system (FLEDS) to show how the concept phase of ISO26262 could be supported by STPAFT.

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Techniques and Measures for Improving Domain Controller Availability while Maintaining Functional Safety in Mixed Criticality Automotive Safety Systems

10.4271/2013-01-0198 ◽

2013 ◽

Cited By ~ 3

Author(s):

Swapnil Gandhi ◽

Simon P. Brewerton

Keyword(s):

Functional Safety ◽

Automotive Safety ◽

Safety Systems ◽

Mixed Criticality

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Analysis of the regulatory framework for confi rmation of the functional safety requirements compliance of microprocessor-based railway automation systems

Automation on Transport ◽

10.20295/2412-9186-2020-6-4-435-465 ◽

2020 ◽

Vol 6 (4) ◽

pp. 435-465

Author(s):

V. Yu. Ryazanov ◽

Keyword(s):

Remote Control ◽

Control Systems ◽

Safety Management ◽

Regulatory Framework ◽

Point Of View ◽

Functional Safety ◽

Railway Transport ◽

Safety Requirements ◽

Automation Systems ◽

Further Development

The article analyzes the current regulatory framework for proof of safety, quality assurance, and confi rmation of the conformity of microprocessor-based railway automation and remote control systems in the EAEU. CENELEC standards are briefl y discussed. A brief overview is provided as regards measures to ensure the required level of safety of microprocessor-based railway automation and remote control systems from the point of view of quality management of development, safety management, and confi rmation of the proper functioning of microprocessor systems. The practice of confi rming the railway transport automated process control systems comply with standards in the form of a declaration of conformity per TR CU 003/2011 has been analyzed. It is concluded that there is a need to develop a regulatory framework to ensure regulated analysis and assessment of railway automation and remote control systems following the requirements of functional safety, as well as further development of standardization documents to regulate methods for assessing functional safety.

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