GB 20071-2025The protection of the occupants in the event of a lateral collision (English PDF)

1 Scope

GB 20071-2025 is the Chinese mandatory standard for occupant protection in a side impact, and it is a type approval requirement for every passenger car and light goods vehicle sold in China. Side impact is the hardest crash mode to protect against, because there is almost no structure between the occupant and the striking vehicle, and the whole discipline rests on the fidelity of the dummy used to measure it. That is what makes this revision significant: the 2025 edition brings in the WorldSID 50th percentile dummy and the EuroSID-2re, each with a full normative specification and positioning procedure, in place of the dummies of the 2006 text, and it adds electrical safety requirements for vehicles with a rechargeable energy storage system, that is for electric and hybrid vehicles after the impact. The document sets the technical requirements including the general requirements, the dummy performance criteria and the special requirements, the test methods and crash test procedure, the rules for determining whether a vehicle is of the same type, and the implementation of the standard. Normative annexes cover the mobile deformable barrier in detail, the two dummies and the partial tests. It replaces GB 20071-2006, which is superseded, applies to M1 and N1 category vehicles and to multi-purpose goods vehicles, and takes effect on 1 July 2026.

This document specifies the technical requirements, test methods and type identification for the protection of the occupants in the event of a lateral collision. This document applies to M1 and N1 vehicles as well as multipurpose goods vehicles.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. 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

4 Technical requirements

4.1 General The vehicle is tested in accordance with the provisions of Chapter

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 position. After the test, the vehicle shall comply with the requirements of 4.2 ~ 4.4.If the vehicle body structure or protection system is asymmetrical and the difference affects the side impact performance, the test shall be carried out on the side that is most unfavorable for the side impact performance according to the most unfavorable principle, and the WorldSID 50th side-impact dummy or EuroSID-2re side-impact dummy shall be placed in the front impact side position.

5 Test methods

5.1 Test site The size of the test site shall be able to accommodate the collision device propulsion system, the movement of the collided vehicle after collision, and the installation of the test equipment. The site where vehicles collide and move shall be level and flat, and the road friction coefficient shall be no less than 0.5.

Appendix A

(Normative) Mobile deformable barrier A.1 General requirements A.1.1 The mobile deformable barrier consists of a trolley and a honeycomb aluminum barrier, in which the honeycomb aluminum barrier is installed at the front end of the trolley. A.1.2 The mobile deformable barrier shall be equipped with a braking system to avoid secondary collision with the test vehicle. A.1.3 The total mass of the mobile deformable barrier shall be 1 400 kg ± 20 kg. A.1.4 The center of gravity of the mobile deformable barrier shall be within 10 mm of the longitudinal mid-vertical plane, 1 000 mm ± 30 mm from the front axle, and 500 mm ± 30 mm from the ground. A.1.5 The distance from the front surface of the honeycomb aluminum barrier to the center of gravity of the mobile deformable barrier shall be 2 000 mm ± 30 mm. A.1.6 In the static state before collision, the height of the intersection of the upper and lower groups of honeycomb aluminum barriers from the ground plane shall be 550 mm ± 5 mm. A.1.7 The front and rear wheel space of the trolley shall be 1 500 mm ± 10 mm. A.1.8 The wheel space of the trolley shall be 3 000 mm ± 10 mm, and the tire pressure of all tires of the trolley shall be adjusted to the same. A.2 Honeycomb aluminum barrier and mounting plate A.2.1 Honeycomb aluminum barrier A.2.1.1 Geometric characteristics A.2.1.1.1 The honeycomb aluminum barrier consists of six parts (blocks A, B, C, D, E, and F) connected together. The shape and distribution of the parts are shown in Figures A.1 and A.2.The dimensions of blocks B and E in width and height are (500±5) mm and (250±3) mm respectively, and the dimensions of blocks A, C, D, and F in width and height are (600±5) mm and (250±3) mm, respectively. A.3.2.1 Install the ventilation device on the front panel of the trolley. A.3.2.2 Ensure that a

0.5 mm thick standard feeler gauge cannot be inserted between the ventilation device and the trolley surface at any point. If a gap greater than

0.5 mm appears, the ventilation system frame needs to be replaced or adjusted so that the gap is no greater than

0.5 mm. A.3.2.3 Remove the ventilation device from the front panel of the trolley. A.3.2.4 Fix a

1.0 mm thick cork padding to the front panel of the trolley. A.3.2.5 Reinstall the ventilation device on the front of the trolley and tighten it until there are no gaps. A.4 Static test A.4.1 For samples taken from each batch of processed aluminum honeycomb barriers (blocks A, B, C, D, E and F), the sample size shall be 250 mm × 500 mm × 440 mm. A.4.2 The sample shall be compressed between two parallel loading plates, with the loading plates at least 20 mm beyond the edge of the cross-section of the honeycomb aluminum barrier aluminum block. A.4.3 The compression speed is 100 mm/min ± 5 mm/min. A.4.4 The minimum sampling frequency for static compressed data is

5 Hz. A.4.5 Continue the static test until the compressibility of the honeycomb aluminum barrier samples (blocks A, B, C, D, E, and F) is at least 300 mm. A.5 Dynamic test A.5.1 Test site The test site shall be large enough to accommodate the runway with a movable deformable barrier, the fixed barrier and the equipment necessary for the test. In the last part of the runway, there shall be at least 5 m of level, smooth road surface in front of the rigid barrier. A.5.2 Rigid barrier and force measuring wall A.5.2.1 The rigid barrier is made of reinforced concrete, with a front width of not less than 3 m and a height of not less than

1.5 m. Its thickness shall ensure that its mass is not less than 70 000 kg. A.5.2.2 The front plane of the force measuring wall shall be vertical and perpendicular to the center axis of the runway. The surface shall be equipped with load sensors to measure the load on each aluminum block on the mobile deformable barrier at the moment of collision. The center of the force measuring wall shall be aligned with the center of the mobile deformable barrier. The installation and surface of the sensor shall comply with ISO 6487. A.5.2.3 For every 200 aluminum blocks of honeycomb aluminum barrier produced, the manufacturer shall conduct a dynamic test using a force measuring wall fixed on the rigid barrier. The load sensor of the force measuring wall shall consist of at least 6 force sensors, covering the blocks A, C, D and F of the honeycomb aluminum barrier. Among them, the surface area of the central load sensor is 500 mm × 250 mm, and the surface area of other load sensors is 600 mm × 250 mm. A.5.2.4 The dimensions of the area surrounding the load sensor shall extend at least 150 mm above the impact surface of the force measuring wall. If the barrier is not perfectly aligned for impact, ensure that the honeycomb barrier surface is crushed evenly and does not wrap around the edge of the load sensor. A.5.2.5 The load sensor surface is equipped with a protective device consisting of plywood with a thickness of 18 mm ± 5 mm to avoid reducing the sensitivity of the sensor. A.5.2.6 The rigid barrier may be fixed or placed on the ground, but shall be fixed with additional fixing devices. A.5.3 Driving of the mobile deformable barrier At the moment of impact, the mobile deformable barrier shall not be affected by the steering and driving devices. The movable deformable barrier shall collide with the force measuring wall vertically, and the collision position deviation shall be within ±15 mm. A.5.4 Measuring devices A.5.4.1 Speed The collision speed shall be 35 km/h ±

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