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GB 24550-2024: Protection of motor vehicle for pedestrians in the event of a collision
GB 24550-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.020
CCS T 09
Replacing GB/T 24550-2009
Protection of motor vehicle for pedestrians in the event of a
collision
ISSUED ON: MAY 28, 2024
IMPLEMENTED ON: JANUARY 01, 2025
Issued by: State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Technical requirements ... 18
5 Test requirements ... 21
6 Test procedure ... 31
7 Calibration of impactor ... 38
8 Determination of the same type ... 51
9 Implementation of the standard ... 51
Protection of motor vehicle for pedestrians in the event of a
collision
1 Scope
This document specifies the technical requirements, test requirements, test procedures,
calibration of impactors, same type determination, implementation of standards for
protection of motor vehicle for pedestrians in the event of a collision.
This document is applicable to categories M1 and N1 vehicles. It does not include the
category M1 vehicles, which have a maximum total mass greater than 2500 kg, where
the driver's seat R point is in front of the front axle’s center transverse plane or the
horizontal distance between the driver's seat R point and the front axle center transverse
plane is not greater than 1100 mm; nor does it include category N1 vehicles with a
driver's seat R point in front of the front axle’s center transverse plane or the horizontal
distance between the driver's seat R point and the front axle’s center transverse plane is
not greater than 1100 mm.
2 Normative references
The contents of the following documents constitute essential clauses of this document
through normative references in the text. Among them, for dated references, only the
version corresponding to that date applies to this document; for undated references, the
latest version (including all amendments) applies to this document.
GB 15084 Motor vehicles - Devices for indirect vision - Requirements of
performance and installation
ISO 3784 Road vehicles - Measurement of impact velocity in collision test
ISO 6487 Road vehicles - Measurement techniques in impact tests - Instrumentation
3 Terms and definitions
The terms and definitions defined in GB 15084 and the following terms and definitions
apply to this document.
3.1
Normal ride attitude
The state of the vehicle when it is in normal driving at a speed of 40 km/h.
Note 1: The vehicle in the state of full vehicle curb weight is placed on a horizontal surface;
the counterweights simulating the driver and one passenger are placed on the driver's seat
and the front passenger seat, respectively. The front seat is placed in the middle position of
the front and rear travel or the first locking position after the middle position. The tire
pressure is the tire pressure specified by the manufacturer; the front wheels are in the straight
driving position; the vehicle suspension is in the state specified by the manufacturer.
Note 2: The curb weight of the vehicle is the weight of the vehicle with the body and all the
assembly equipment, electronic and auxiliary equipment (such as fluids, tools, fire
extinguishers, standard spare parts, wheel chocks, spare tires, etc.) required to ensure the
normal operation of the vehicle; the fuel tank (if any) is filled with fuel accounting for 90%
of the total capacity; other fluids are added to the capacity specified by the manufacturer.
The counterweight mass of the driver and passenger is 75 kg, consisting of 68 kg of
simulated human mass on the seat and 7 kg of simulated luggage mass, which is placed in
the rear luggage compartment (or placed in the front luggage compartment).
3.2
Ground reference plane
The horizontal plane passing through the lowest contact point of all tires of the
vehicle in the normal ride attitude of the vehicle.
Note: This plane is real or imaginary. If the vehicle is stationary on the ground, it is on the
same plane as the ground level; if the vehicle is lifted from the ground to obtain additional
clearance under the bumper, it is above the ground level.
3.3
Front structure
All front end external structures of the vehicle, excluding the front windscreen upper
crossbeam, A-pillar, structure behind the A-pillar.
Note: It includes but not limited to bumper, bonnet, fender, water channel, wiper shaft, front
windscreen, front windscreen lower beam, etc.
3.4
Bumper
External component located at the front of the vehicle with decorative, absorbing
and mitigating impact functions.
Note: It includes all structures and accessories that protect the vehicle in a low-speed frontal
collision.
3.28
Assessment interval
The specific time period -- from the moment when the lower leg form impactor first
contacts the vehicle to the moment when all leg bone bending moment curves of the
lower leg type reach the maximum value (exceeding 15 N·m) for the first time and
then drop to zero.
Note 1: The assessment interval of ligament extension is the same as that of leg bone
bending moment. If there is a leg bone bending moment curve that does not intersect with
zero during the time period when all leg bone bending moments intersect with zero, all leg
bone bending moment time history curves are moved up or down, until all leg bone bending
moment curves intersect with zero for the first time. The movement of the leg bone bending
moment time history curve is only used to determine the assessment interval.
Note 2: If the leg bone bending moment curves do not drop to zero at the same time, a
specific time period -- from the first contact between the lower leg form impactor and the
vehicle to the first intersection of all leg bone bending moment curves -- is selected; the
movement of the leg bone bending moment time history curve is only used to determine the
assessment interval.
3.29
Atypical windscreen fracture behavior
The fracture phenomenon that occurs during the test of the headform impactor
hitting the windscreen.
Note: Within the first 4 ms after the first contact between the headform and the windscreen,
the absolute value of the minimum value of the headform acceleration and the time
derivative is not greater than 180 g/ms; or the windscreen remains unbroken for more than
1 ms.
4 Technical requirements
4.1 Leg form test requirements
4.1.1 General
Vehicles with a lower bumper height of less than 425 mm shall comply with the
requirements of 4.1.2.
Vehicles with a lower bumper height of not less than 425 mm but less than 500 mm
shall comply with the requirements of 4.1.2 or 4.1.3.
Vehicles with a lower bumper height of not less than 500 mm shall comply with the
of each area shall not be greater than 1000; the HIC of the remaining area shall not be
greater than 1700.
4.3 Test requirements for vehicles with variable height
If the vehicle is equipped with a system that can change the body height during driving
on urban roads, meanwhile the change in the front axle height is greater than 25 mm
when the driving speed is within 25 km/h ~ 40 km/h, the measurement points of relevant
test area caused by the change in body height shall also comply with the provisions of
4.1 and 4.2. The impact speed of the impactor is the speed specified in Chapter 6 or the
driving speed corresponding to the vehicle height (the speed deviation is ±0.2 m/s).
When the driving speed...