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Efficient Vehicle-level Coordination in Functional Safety Process for a Whole Vehicle

Article of Honda R&D Technical Review Vol.29 No.1


On-board logical electrical and/or electronic systems are required to comply with functional safety standard ISO 26262. Functional safety activities involve implementing a standard-compliant process as a measure to help prevent any physical injury or damage to human health that may be caused by system malfunctions. In order to efficiently comply with ISO 26262 in automotive development relating multiple systems intricately, the personnel working on each system need to rationally coordinate and implement the functional safety activities for a whole vehicle. Honda has therefore added to the functional safety process its own process of coordinating functional safety requirements. The process involves investigating how the systems of the whole vehicle relate at the vehicle level, formulating methods to allow necessary and sufficient boundaries of functional safety activities to be set, conducting impact analyses cooperatively by using the system interfaces as guides, and coordinating the functional safety requirements. This eliminates the overlap in impact analysis scope, improving accuracy for system internal impact analyses. Further, adding the proprietary process to link systems has resulted in exhaustive implementation of high-precision impact analyses at the vehicle level, in turn forming a vehicle-level functional safety process for the whole vehicle capable of appropriately deploying functional safety requirements.


(1) ISO 26262: Road Vehicles–-Functional Safety--, (2011)
(2) Sagami, H., Hironaka, S., Mori, R., Mukai, T.: System Design Process in Compliance with ISO26262 Using Model-Based Design, Honda R&D Technical Review, Vol. 26, No. 2, p.173-180

Author (organization or company)

Takashi OHTA(Automobile R&D Center)、Hiroki SAGAMI(Automobile R&D Center)

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