Calculating Probability Metric for Random Hardware Failures (PMHF) in the New Version of ISO 26262 Functional Safety - Methodology and Case Studies

A Sensor Fault Detection Scheme as a Functional Safety Feature for DC-DC Converters

Sensors ◽

10.3390/s21196516 ◽

2021 ◽

Vol 21 (19) ◽

pp. 6516

Author(s):

Simon Schmidt ◽

Jens Oberrath ◽

Paolo Mercorelli

Keyword(s):

Fault Detection ◽

Buck Converter ◽

Fault Detection And Isolation ◽

Functional Safety ◽

Sensor Faults ◽

Virtual Sensor ◽

Detection Scheme ◽

Iso 26262 ◽

Safe State ◽

Hardware Failures

DC-DC converters are widely used in a large number of power conversion applications. As in many other systems, they are designed to automatically prevent dangerous failures or control them when they arise; this is called functional safety. Therefore, random hardware failures such as sensor faults have to be detected and handled properly. This proper handling means achieving or maintaining a safe state according to ISO 26262. However, to achieve or maintain a safe state, a fault has to be detected first. Sensor faults within DC-DC converters are generally detected with hardware-redundant sensors, despite all their drawbacks. Within this article, this redundancy is addressed using observer-based techniques utilizing Extended Kalman Filters (EKFs). Moreover, the paper proposes a fault detection and isolation scheme to guarantee functional safety. For this, a cross-EKF structure is implemented to work in cross-parallel to the real sensors and to replace the sensors in case of a fault. This ensures the continuity of the service in case of sensor faults. This idea is based on the concept of the virtual sensor which replaces the sensor in case of fault. Moreover, the concept of the virtual sensor is broader. In fact, if a system is observable, the observer offers a better performance than the sensor. In this context, this paper gives a contribution in this area. The effectiveness of this approach is tested with measurements on a buck converter prototype.

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New Model-Based Paradigm: Developing Embedded Software to the Functional Safety Standards, as ISO 26262, ISO 25119 and ISO 13849 through an efficient automation of Sw Development Life-Cycle

10.4271/2014-01-2394 ◽

2014 ◽

Author(s):

Demetrio Cortese

Keyword(s):

Life Cycle ◽

Embedded Software ◽

Functional Safety ◽

New Model ◽

Iso 26262 ◽

Safety Standards ◽

Model Based ◽

Development Life Cycle

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Functional Safety of Driver Assistance Systems and ISO 26262

Handbook of Driver Assistance Systems ◽

10.1007/978-3-319-09840-1_6-1 ◽

2015 ◽

pp. 1-18

Author(s):

Ulf Wilhelm ◽

Susanne Ebel ◽

Alexander Weitzel

Keyword(s):

Functional Safety ◽

Driver Assistance ◽

Driver Assistance Systems ◽

Iso 26262 ◽

Assistance Systems

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Functional safety requirements of traction inverter in accordance to ISO 26262

E3S Web of Conferences ◽

10.1051/e3sconf/202018401062 ◽

2020 ◽

Vol 184 ◽

pp. 01062

Author(s):

R Bhavana ◽

Omsekhar Indela ◽

Mohammed Sajid Yaragatti

Keyword(s):

Short Circuit ◽

Functional Safety ◽

Iso 26262 ◽

Safety Requirements ◽

Automotive Systems ◽

Safety And Reliability ◽

Electric Traction ◽

Electronic Controller ◽

Short Circuit Fault ◽

Electronic Sensors

With the improvement and development in the automotive, the safety related aspects are also becoming more important. Hence there is a stringent demand for the Functional Safety and reliability. In these years, most of the vehicles are made with electrical and electronic components and systems which include lots of Electronic Controller Units (ECUs), electronic sensors, bus systems with coding. Due to the complexity in application of these electrical, electronics and programmable electronics, it is necessary to analyze the potential risk of malfunction for automotive systems. Thus, ISO 26262 has been introduced for automotive electrical/electronic (E/E) systems which ensure the complete safety installation of all ECUs, E/E systems its technical as well as management issues. In this paper, functional safety in accordance with ISO 26262 Part 3 of an electric traction inverter is done, the Functional safety report is generated in MEDINI TOOL and the short circuit fault of traction inverter is considered for Functional safety using MATLAB/SIMULINK.

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