GB/T 37437-2019 English PDF (GBT37437-2019)

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GB/T 37437-2019: Frontal airbag -- Technical requirements of protection for out of position occupant
GB/T 37437-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.60
T 26
Frontal airbag - Technical requirements of protection
for out of position occupant
ISSUED ON: MAY 10, 2019
IMPLEMENTED ON: DECEMBER 01, 2019
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Technical requirements ... 5 
5 Test methods ... 12 
Frontal airbag - Technical requirements of protection
for out of position occupant
1 Scope
This Standard specifies test methods and technical requirements of protection
for out of position occupant of frontal airbag.
This Standard is applicable to frontal airbag system with function of protecting
out of position occupants.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB 4094, Motor vehicles - Symbols for controls, indicators and tell-tales
GB 27887, Restraining devices for child occupants of power-driven vehicles
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 out of position occupant
an occupant in an abnormally designed riding posture
3.2 point A
the point 114mm ± 3mm down from the top along the midline of the front of the
chest of the 3-year-old child's dummy
3.3 point B
the point 139mm ± 3mm down from the top along the midline of the front of the
chest of the 6-year-old child's dummy
3.4 point C
the geometric center of the front airbag module of the front row outer occupant
is connected to the geometric center of the static fully deployed airbag; point C
refers to the intersection of the connection and the instrument panel
3.5 plane A
a vertical plane passing through the longitudinal centerline of the child restraint
system
3.6 plane B
for a single seat, it is a vertical plane that passes through the longitudinal
centerline of the right front outer seat cushion and is parallel to the longitudinal
centerline of the vehicle; for bench seats, it is a vertical plane parallel to the
longitudinal centerline of the vehicle that passes the right front seat and has the
same distance from the centerline of the steering wheel to the longitudinal
centerline of the vehicle
3.7 plane C
a horizontal plane passing point C
3.8 plane D
a vertical plane passing through point C and parallel to the longitudinal center
plane of the vehicle
3.9 plane E
a vertical plane that passes the geometric center of the fully deployed state of
the driver's frontal airbag and is parallel to the longitudinal center plane of the
vehicle
4 Technical requirements
4.1 Protection provided to infants in child restraint systems or portable
cots after use
4.1.1 General requirements
Carry out the test in accordance with the test method specified in 5.1 and meet
the requirements of 4.1.2 or 4.1.3.
4.1.2 Automatic suppression function
4.1.2.1 The vehicle is equipped with a front passenger side airbag system with
automatic suppression function. In each static test specified in 5.1.2, prevent
force and neck torque are both filtered using CFC600.
4.2 Protection of mixed type III 3-year-old child dummy
4.2.1 General requirements
The test is carried out in accordance with the test method specified in 5.2 and
shall meet the requirements of 4.2.2 or 4.2.3.
4.2.2 Automatic suppression function
4.2.2.1 The vehicle is equipped with a front passenger side airbag system with
automatic suppression function. In each static test specified in 5.2.2, prevent
the front passenger side airbag system from being activated. In each static test
specified in 5.2.3, the front passenger side airbag system is activated.
4.2.2.2 The vehicle is equipped with at least one luminous signal device. The
signal device meets the requirements of 4.1.2.2.
4.2.2.3 Regardless of whether the front outer passenger seat is occupied or not,
the vehicle needs to have the function of indicating whether the airbag system
is suppressed. In addition to the signal device described in 4.2.2.2, the device
does not need to be located in the passenger compartment.
4.2.3 Low-risk deployment of front passenger side airbags
4.2.3.1 All parts of the dummy and child restraint system are contained in the
passenger compartment of the vehicle.
4.2.3.2 For the dummy head injury evaluation index, the calculated maximum
value of HIC15 is not more than 570. For any two moments t1 and t2, the time
interval between the two in the collision is not more than 15ms and t1 is less
than t2, the head injury evaluation index (HIC15) is determined by the
acceleration a measured at the center of gravity of the dummy's head,
expressed by g. Use formula (1) to calculate.
4.2.3.3 The time when the synthetic acceleration of the dummy's chest is
greater than 55g shall not exceed 3ms.
4.2.3.4 The compression of the dummy's chest is not more than 34mm.
4.2.3.5 For the upper neck injury index of the dummy, during the collision, the
axial force (Fz) may be the tensile force or the compressive force. At the same
time, the bending moment (Mocy) of the occipital condyle may be bending or
extension. This makes Nij [see formula (3)] produce four possible load
conditions: tension-extension (Nte), tension-bending (Ntf), compression-
extension (Nce), or compression-bending (Ncf). At any time during the collision,
5 Test methods
5.1 Test method for infant protection of child restraint system or portable
bed after use
5.1.1 General test conditions
5.1.1.1 The child restraint system used in the test shall meet the requirements
of GB 27887.
5.1.1.2 The outer front passenger seat is tested separately in the last position,
middle position, and most front position in the front and rear direction. If the
child restraint system or dummy comes into contact with the vehicle interior
parts, move the seat back to a fixed position from the contact position. If it is an
electric seat, move the seat backward to a position where there is a maximum
clearance of 5mm.
5.1.1.3 If the rear-facing child restraint system or portable bed is equipped with
a handle, the handle is located in the position recommended by the
manufacturer of the child restraint system and the handle is in an upright
position for testing.
5.1.1.4 If the rear-facing child restraint system or the portable bed is equipped
with an awning, the awning is in a fully open position and a fully closed position
for testing.
5.1.1.5 The rearward child restraint system or the portable bed is not covered
and the 1.0kg towel or blanket is tested separately. The towel or blanket is
placed in a way to cover the child restraint system or from the top of the seat
back to the frontmost position of the restraint system.
5.1.1.6 If the rear-facing child restraint system or the portable bed has an
ISOFIX fixing system and the vehicle's front outer passenger seat is equipped
with ISOFIX fixing points, then in the test of securing with a seat belt, under the
condition of using the child restraint system ISOFIX fixing system and not using
the vehicle seat belt, as well as under the condition of usin...