GB 20071-2025 (English) The protection of the occupants in the event of a lateral collision
1 Scope
This document specifies the technical requirements, test methods, and judgment on the same type for the protection of the occupants in the event of a lateral collision for motor vehicle.
This document is applicable to Categories M1 and N1 motor vehicles, as well as multipurpose goods vehicles.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions 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 11551 The protection of the occupants in the event of a frontal collision for motor vehicle
GB 14166 Safety-belts and restraint systems for occupants of power-driven vehicles
GB 14167 Safety-belt anchorages and restraint systems anchorages for occupants of power-driven vehicles
GB 15086 Motor vehicles’ door locks and retention components performance requirements and test methods
GB/T 19596 Terminology of electric vehicles
GB/T 31498-2021 Post crash safety requirement for electric vehicle
ISO 6487 Road vehicles - Measurement techniques in impact tests - Instrumentation
ISO 15830 Road vehicles - Design and performance specifications for the WorldSID 50th percentile male side-impact dummy
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB 15086 and GB/T 19596 and the following apply.
3.1
multipurpose goods vehicle
vehicle with a conventional body and cab structure, an open cargo box (which may be equipped with a cargo box cover), a seating capacity of no more than 5 persons (including the driver), and a maximum design total mass not exceeding 3,500kg
Note: A conventional body refers to a design where more than half of the engine length is located ahead of the foremost point of the vehicle's front windshield (excluding battery electric vehicles and fuel cell electric vehicles), and the center of the steering wheel is located behind the front quarter of the vehicle's total length.
[Source: GB/T 3730.1-2022, 6.4]
3.2
passenger compartment
space for occupant accommodation, bounded by the roof, floor, side walls, doors, outside glazing, front bulkhead, rear bulkhead or the plane of the rear seat back support, and electrical protection barrier and outer shell for preventing occupants from contacting live components
[Source: GB/T 19596-2017, 3.1.2.2.5]
3.3
rechargeable electrical energy storage system; REESS
energy storage system that is rechargeable and capable of supplying electrical energy
Note: This does not include energy storage systems that supply power for engine start-up, lighting, or other vehicle auxiliary systems.
[Source: GB 18384-2020, 3.1, modified]
3.4
H point
reference point for each seat, determined in accordance with the confirmation procedures specified in GB 11551 for the H point and the actual seat back angle of the seating position
3.5
R point
reference point determined by the vehicle manufacturer based on the vehicle's structure
Note: It represents the theoretical position of the H point when the driver's seat is in its lowest and rearmost position, or the position specified by the vehicle manufacturer for each seating position.
3.6
fuel tank
independent tank assembly fixed on a vehicle for storing fuel, consisting of the fuel tank body, refueling pipe, refueling port, fuel tank cap, pipe connections, and other accessory devices
[Source: GB 18296-2019, 3.1, modified]
3.7
protective system
internally mounted components and devices for restraining occupants
3.8
kerb mass
mass of a vehicle in running order, excluding the driver, passengers, and cargo
Note: It includes the fuel tank (if present, filled to 90% of its total capacity) and/or on-board energy storage devices, with coolant and lubricant levels in accordance with the manufacturer's requirements, and equipped with the accompanied tools and spare wheel(s) (if provided by the vehicle manufacturer as standard outfits).
3.9
reference mass
kerb mass of the vehicle plus 100kg (that is the mass of the side-impact dummy and its measurement instrumentation)
3.10
trolley
wheeled frame designed to travel freely along its longitudinal axis towards the point of impact, with honeycomb aluminum barriers installed at the front end
3.11
honeycomb aluminum barrier
deformable section mounted on the front of trolley
3.12
mobile deformable barrier
device consisting of a trolley and honeycomb aluminum barriers for impacting the test vehicle
3.13
automatically activated door locking system
system that automatically locks the doors at the preset speed or other conditions set by the vehicle manufacturer
3.14
latch
device that keeps the door in a closed position relative to the vehicle body and can be intentionally opened (or operated)
[Source: GB 15086-2013, 2.7]
3.15
striker (or stop)
component engaged with the latch to keep the door in a secondary latched or fully latched position
[Source: GB 15086-2013, 2.8]
3.16
fully latched position
engaging position between latch and striker (or stop) when the door is fully closed
[Source: GB 15086-2013, 2.9]
3.17
secondary latched position
engaging position between latch and striker (or stop) when the door is not fully closed
[Source: GB 15086-2013, 2.10]
3.18
latched
engagement state of the door lock in either the fully latched position, secondary latched position, or any position between them
3.19
seat cushion reference point
reference point for adjusting the longitudinal (front and rear) and vertical travel of an adjustable seat cushion, which is located outside the seat cushion support structure
3.20
seat cushion reference line
plane curve passing through the seat cushion reference point on the outer surface of the seat cushion
Note: The projection of the seat cushion reference line in the median longitudinal vertical plane of the vehicle is a straight line and it forms an angle with the horizontal plane.
3.21
seat cushion reference line angle
angle formed by the projection of the seat cushion reference line in the median longitudinal vertical plane of the vehicle relative to the horizontal plane (or horizontal reference plane)
4 Technical requirements
4.1 General
The vehicle shall be tested in accordance with Clause 5. The test shall be carried out on the driver’s side, with a WorldSID 50th side-impact dummy or a EuroSID-2re side-impact dummy placed at the driver's seat. After the test, the vehicle shall meet the requirements of 4.2~4.4. If the vehicle's body structure or protective system is asymmetrical and the difference affects lateral collision performance, the test shall be carried out on the side most unfavorable to lateral collision performance, following the worst-case principle. The WorldSID 50th side-impact dummy or the EuroSID-2re side-impact dummy shall be placed in the front seat on the impact side.
4.2 Performance index requirements for dummies
4.2.1 WorldSID 50th side-impact dummy
4.2.1.1 The head injury criterion (HIC36) shall not be greater than 1,000. When there is no head contact, the HIC shall not be calculated, and the result shall be recorded as "No Head Contact".
4.2.1.2 The lateral shoulder peak force shall not be greater than 3kN.
4.2.1.3 The deformation of the chest ribs shall not be greater than 50mm.
4.2.1.4 The deformation of abdominal ribs shall not be greater than 65mm.
4.2.1.5 The public symphysis peak force shall not be greater than 2.8kN.
4.2.2 EuroSID-2re side-impact dummy
4.2.2.1 The head injury criterion (HIC36) shall not be greater than 1,000. When there is no head contact, the HIC shall not be calculated, and the result shall be recorded as "No Head Contact".
4.2.2.2 The deformation of the chest ribs shall not be greater than 44mm.
4.2.2.3 The abdomen peak force shall not be greater than 2.5kN internal force.
4.2.2.4 The public symphysis peak force shall not be greater than 6kN.
