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INTERNATIONAL ORGANIZATION OF MOTOR VEHICLE MANUFACTURERS. Lower/Upper Bumper Reference Line. Data on existing vehicles. Lower Bumper Reference Line i s very close to the practical lower bumper height because of the absence of a skirt. Practical Upper Bumper Height. about 508mm. about 406mm.

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Presentation Transcript
introduction

Lower Bumper Reference Line is very close to the practical lower bumper height because of the absence of a skirt

Practical Upper Bumper Height

about 508mm

about 406mm

25º

Lower Bumper Reference Line

Approach Angle for SUV

Typical Passenger Car

Typical SUV

Introduction

Practical Lower Bumper Height

Around 440 mm

Around 240 mm

slide3

SUV average:438mm

Others:243mm

slide4

Counter measures for Lower Leg Requirements

Typical Current Passenger Car

Improved car

Largebendingangle

Smallbendingangle

Addskirt

Practically 60mm Energy Absorbing bumper needed

Typical SUV

Large bending angle

High bumper test requirement

@ Max. Load 7.5KN @Max. Bending Moment 510Nm

or

Practically 120mm Energy Absorbing bumper needed

Typical passenger cars can meet the angle requirement, because they can have lower load path at the skirt. However, SUV cannot have such lower load path and have difficulties to meet the angle requirement.

conclusions
Conclusions
  • SUV, because of their basic design, cannot include a lower load path for the lower leg test
  • SUV therefore need the option of the upper leg bumper test
  • Typical Lower Bumper Reference Line for SUV start at 340 mm up to 500 mm
  • In order to cover a representative portion of existing SUV’s, such option (lower or upper leg to bumper test) should therefore be possible for LBRL between around 400 and 500 mm
slide6

LEGFORM IMPACT TEST

&

HIGH BUMPER IMPACT TEST

Bending Angle

Shear Displacement

Load

Acceleration

BendingMoment

slide7

Comparison of Both Tests

Red = Over

Blue = Meet

High Bumper Test Results (Upper Leg Impactor)

Close to 80%

TRL Leg Form Impactor Test Results

Counter measure for high bumper test could not largely reduce the bending angle, but reduce acceleration and shear displacement up to the required level by LFI test.

slide8

Leg Injury Distribution

JAPAN

Fibula+ Ligament Laceration 2%

Patella 2%

Femur + Tibia

2%

Ligament Laceration 2%

Femur 5%

Tibia 28%

・Tibia, Fibula, Tibia + Fibula 87%

・Femur 5%

・Femur + Tibia 2%

・Ligament Laceration, Ligament Laceration + Fibula 4 %

Tibia+Fibula35%

Bone name shows fracture

Fibula 24%

At least, tibia, fibula or femur fractures which share large part of AIS2+ leg injuries could be expected to be reduced by the high bumper test application.

Distribution of AIS 2+ Leg Injuries

by ITARDA report issued 2005

117 pedestrian accidents in 1993-2003, bonnet type passenger car

slide9

Conclusions

@ The lower leg to bumper test is not feasible for high bumper vehicles.

@ High bumper vehicles need to have energy absorbing bumpers in order to meet the upper leg to bumper test.

@ Energy absorbing bumpers will reduce real world leg injuries as also seen in the lower leg acceleration criterion.

END