D3.2 Architecture of a generic FEV's powertrain

Executive Summary

This document represents a summary of the initial work carried out in WP2 of the HEMIS project, and the more refined description of the Electrical Transmission that was developed in WP3. The aim of this document is to serve to public dissemination of the HEMIS results. The document is structured in several chapters that describe the work carried according to the logical flow of the development process.

Based on previous documents, Deliverable D3.2 starts with an introduction to the generic architecture defined for FEVs, which was developed in WP2 is the basis for all subsequent work. The architecture is seen in multiple views, that is, “Network View”, “Functional View” and “System Hierarchy View”. The Network View focuses on the network architecture and organization of the subsystems of the FEV and the Functional View” is focused in the functions performed by subsystems of FEV, and their interactions, whereas the “System Hierarchy view” focuses its attention on their hierarchical relationships.

Following the description of the FEV architecture, the Mission Profile considered for this work is introduced. The Mission Profile summarizes the conditions that should be taken into account regarding the multiple variables that can affect the vehicle behaviour such as population density, day and time of year, weather, local topography, road type and others and that need to be considered in successive analysis.

Next, the concept of Preliminary Hazard Analysis is introduced as a way to translate system hazards into design constraints, or functional safety requirements. For this, the classification criteria according to ISO 26262 are presented. Afterwards the main hazards identified according to the FEV architecture are introduced.

Fault Tree Analysis is a methodology that, in a top-down approach, shows graphically the interrelationships between the potential critical event in a system and the reasons for this event. In our case it is a model that illustrates the state of the FEV’s subsystems (basic events) and the connections between these basic events and the system’s state. After the introduction of the concept, the current FTA for the FEV is introduced.

Following this,, a detailed description of the subsystems and components of the Electrical Transmission and its related functions is provided. This description serves to better understand the way the Electrical Transmission works, the nature of its functions, and how they are implemented. The aim of this description is to contribute to a better understanding of the subsystems and to help to identify failure modes and their consequences. The subsystem description is focused on the Electrical Machine (motor) and its associated electronic Control subsystem.

Finally, a short description of the FMECA methodology is provided, accompanied by an example of some failure modes identified for the Control sub-system of the Electrical Transmission.

The generic Electrical Transmission architecture developed in Task 3.1 provided the basis for a more detailed investigation of the failure modes of the Electrical Transmission (Task 3.2, documented in D3.2) and their relationship to the functional safety hazards identified in WP2.


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Project acronym:

Project name:
 Electrical powertrain Health Monitoring for Increased Safety of FEVs

Project reference:

Start date: 01/06/2012
End date: 28/02/2015

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