[Pacific Automotive Network Technology Channel] As the definition of traditional cars is completely subverted, and car functions become more and more complex and diverse, safety standards also need to be continuously upgraded. The C-NCAP we are familiar with has also received its

[Pacific Automotive Network Technology Channel] As the definition of traditional cars is completely subverted, and car functions become more and more complex and diverse, safety standards also need to be continuously upgraded. The C-NCAP we are familiar with has also received its fifth update, making the test items more comprehensive and the difficulty level also increasing. Next, let’s take a look at the changes in the new version!

In the current crash test of the 2018 version of the regulations, there are more and more five-star evaluations. This does not have much promotion effect for car companies, so they have adopted a more stringent standard system. The 2021 version of C-NCAP is similar to the 2018 version of C-NCAP. The comprehensive score rate is still calculated by weighting the score rates of the three parts of occupant protection, pedestrian protection and active safety.

2021 version C-NCAP test project

1, the occupant protection part includes crash test , child protection static evaluation and low-speed rear collision neck protection test. Among them, three tests were conducted on traditional cars: frontal collision with a rigid barrier with 100% overlap, frontal collision with a moving progressively deformable barrier with 50% overlap, and side collision with a deformable moving barrier.

New energy vehicles (including pure electric vehicles and plug-in hybrid vehicles ) undergo three tests: frontal 100% overlap rigid barrier collision, frontal 50% overlap moving progressive deformation barrier collision and side pillar collision.

2. The pedestrian protection part includes head shape test and leg shape test.

3. The active safety part includes vehicle automatic emergency braking system (AEB), lane keeping assist system (LKA) and vehicle lighting system performance tests, as well as vehicle electronic stability control system (ESC), lane departure warning system ( Review of performance test reports for LDW), Blind Spot Monitoring System (BSD) and Speed ​​Assist System (SAS).

The main revised content of the new regulations

1. Occupant protection part

The revised content of occupant protection

1

uses a frontal 50% overlap moving progressively deformable barrier collision test, replacing the frontal 40% overlap deformable barrier collision test and evaluation method;

2

is for the new For energy vehicles, the side pillar impact test is used to replace the deformable movable barrier side impact test and evaluation method;

3

adds the collision safety performance risk evaluation requirements of the body and parts, reflected in the form of penalty points;

4

adds the deformable movable barrier The number of dummies carried in the barrier side impact test;

5

added the whiplash test and evaluation method for the second row seats on both sides;

6

added the second row child occupant protection evaluation method and the child occupant protection static evaluation method;

7

modified the technical requirements for side curtain air curtain extra points;

8

added technical requirements for accident emergency call system extra points;

9

seat belt reminder device was changed from extra points to penalty points;

10

modified the electrical safety in the occupant protection test Evaluation methods.

"Traditional models"

"New energy models"

Frontal 50% overlap moving progressive deformation barrier collision

The test vehicle and the MPDB trolley performed a frontal 50% offset collision at a speed of 50km/h, while in the front row Different types of dummies are placed at the driver and passenger positions, the leftmost seat in the second row, and the rightmost seat in the second row to measure injuries to personnel.

After the test, it is necessary to measure the deformation of the gradient barrier at the front end of the mobile trolley to evaluate the vehicle's attack performance.

[The picture shows the E-NCAP test chart, for illustration only]

Compared with the fixed frontal 40% offset collision, since the two vehicles are performing relative motion , the relative speed is as high as 100km/h, while the previous collision speed was only is 64km/h, the energy generated during the impact will also become larger. In addition, progressive deformation barriers are closer to the actual buffer structure of the vehicle than deformable barriers.

Side pillar collision test (new energy vehicle test project)

In the side pillar collision test, the collision speed of the vehicle was 32km/h. At the same time, the longitudinal center line of the vehicle formed a 75° collision angle with the direction of vehicle movement, and the driver was driving in the front row. A dummy is placed at the operator's position to measure personnel injuries.

[The picture shows the E-NCAP test chart, for illustration only]

Since the impact is on a pillar, the local area will bear a huge impact force. At the same time, it is directly close to the driver's position, and the driver's safety will be greatly threatened. In addition, the battery pack will withstand large impacts and extrusion forces, so it becomes extremely important to prevent the battery pack from deforming, causing electrolyte leakage and causing a fire.

In the traditional car side impact test, a dummy is added to the front seat position on the non-impact side to collect collision data for the occupants on that side, but it is not currently involved in the evaluation. The

2021 version of the evaluation procedures also strengthens the protection evaluation of child members, including dynamic tests and static evaluations. In the dynamic evaluation, the Q10 child dummy was added to the frontal 50% MPDB crash test, and its damage was quantitatively evaluated to improve the protection performance of child members; the static evaluation mainly emphasized the applicability of the vehicle to the child restraint system, Installation, and communication between the vehicle and the child restraint system.

2. Pedestrian protection part

Pedestrian protection revision content

1

Modified the pedestrian protection test and evaluation method, using the Advanced Pedestrian Legform Impactor (aPLI) instead of the traditional FLEX-PLI and TRL upper leg impactors for pedestrian leg collisions Protection test evaluation;

2

expanded the pedestrian protection head type test area.

Since FLEX-PLI lacks a module to replace the upper limb movement, the APLI leg type adds a module to represent the upper limb movement in the study, and at the same time improves the weight distribution of muscles and bones, which helps to improve the degree of biological simulation.

3. Active safety part

Active safety revision content

1

adds the test scenario of the vehicle automatic emergency braking system (AEB);

2

adds the lane keeping assist system (LKA) test and evaluation method;

3

adds the lane departure warning system (LDW), Blind Spot Monitoring System (BSD), and Speed ​​Assist System (SAS) review items and technical requirements;

4

added vehicle lighting performance testing and evaluation methods;

5

modified the scoring system, and the active safety weight increased from 15% 25%.

The active safety part has been more comprehensively and carefully assessed. Among them, the vehicle lighting performance test and evaluation methods have been included in the new vehicle evaluation procedures for the first time. This is also the first time that lighting safety evaluation has been introduced in global NCAP.

According to CIDAS statistics, 45% of fatal accidents and 60% of pedestrian fatal accidents occur under poor lighting conditions, including scenes such as early morning, dusk or night, which shows the importance of automobile lighting systems for driving safety.

What is the difference in scoring between the 2021 version and the 2018 version?

C-NCAP performs star evaluation based on the comprehensive score rate of the three parts of occupant protection, pedestrian protection and active safety. The scores of each part are as follows:

In the 2021 version of C-NCAP, only traditional cars are subject to side collisions, and the side collision scores are multiplied by a factor of 1.2 and then included in the total score of the occupant protection part; only new energy vehicles are subject to side pillar collisions, and the side pillar collision scores are multiplied A coefficient of 1.5 is used to calculate the total score for the occupant protection part; the optional audit items for the ADAS part only examine the vehicle being tested, and can score up to 7 points.

2021 version score rate calculation for each part

1

Passenger protection part score rate = actual score of the passenger protection part / full score of the passenger protection part

2

Pedestrian protection part score rate = actual score of the pedestrian protection part / 15

3

Active safety part score rate = ADAS actual score / 56 x 80% + actual lighting score / 10 Rate

written at the end

The upgrade of collision standards continues to promote the progress of automobile safety, and in the five-star exam-oriented education, the upgrade of standards must keep pace with the times.It is learned from the research report of China Automotive Evaluation that the new car-car collision scene in the 2021 version has become the main loss point, including the poor avoidance effect of the AEB function at night and the glare of the low beam on the oncoming vehicle. The points lost also indicate the current weak links in the automotive industry.

As the 2021 version of C-NCAP becomes more stringent, it also places higher requirements on car companies. However, only the right level of difficulty will play a more positive role in the automotive industry. Standards that cannot differentiate between levels are meaningless.

Star Yue L collision test preview

Pacific Automotive will also exclusively witness the "Star Yue L collision test". There will be two live crash test broadcasts, the side impact test at 14:00 on July 19 and the side impact test at 16:00 on July 21 Crash test for MPDB - this is the first public collision in China, it’s so exciting!

What questions do you have about the 2021 version of C-NCAP regulations and collisions? You can leave a message in the comment area and download the Pacific Automotive APP, and we will answer your questions in the live broadcast room. (Text: Pacific Automotive Network Yayong)