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Pedestrian Protection System: Hood lift study
University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
2015 (English)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
Fotgängarskydd : Konceptstudie för huvlyft (Swedish)
Abstract [en]

Every year approximately 400 000 pedestrians are killed worldwide in road related injuries where children and elderly are the most exposed age groups. The design of the front-end of a vehicle and the structural stiffness have a significant influence on the kinematics and injury risks of the pedestrian body. To create a clearance between the rigid hood structure and the hood, the hood is lifted. A lifted hood does however not provide protection over the cowl, windscreen and A-pillar areas.

This study is performed at Autoliv Sverige AB and the purpose is to examine how fast the hood can be lifted 100 mm using a pedestrian protection airbag. The airbag give an extended protection while covering the cowl, windscreen and A-pillar areas.

A concept generation session was performed where modifications of the current pedestrian protection airbag, for a faster hood lift, were proposed. The generated concepts proceeded to a concept screening session where the Autoliv evaluation matrix was used.

The selected concepts went further to static testing where the performance of each concept was tested. The performance include the lift time of 100 mm for the most rearward section of the hood, positioning of the cushion and pressure distribution. The tests were carried out in a room temperature environment.

To conclude the thesis work, one winning concept could not be obtained. Two concepts excelled themselves from all the concepts and a difference in the performances between these two concepts could not be found.

In this thesis no calculations on costs such as material costs and manufacturing costs has been made. This can be the major aspect on choosing one winning concept but due to the fact that there is no time for a cost analysis in this thesis, the PPA development team will take over.

Place, publisher, year, edition, pages
2015. , 36 p.
Keyword [en]
Autoliv, Pedestrian, Protection, Airbag, PPA, Hood, Lift, Vehicle, safety
National Category
Mechanical Engineering
URN: urn:nbn:se:hv:diva-7655Local ID: EXC580OAI: diva2:815836
Subject / course
Mechanical engineering
Educational program
Available from: 2015-06-03 Created: 2015-06-02 Last updated: 2016-10-06Bibliographically approved

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