[YesAuto Technology] The new E-NCAP crash results have been announced, and we have released the relevant results earlier (click for details). Among all tested models, the BMW i3 (with four-star results) looks a bit special , On the one hand, it is an electric car, on the other hand, the body (passenger compartment) of the BMW i3 uses a different material-CFRP (carbon fiber reinforced composite material). Based on these two points, we pay particular attention to the performance of this car in the crash test.
Before entering the collision analysis, let's briefly understand the general situation of this car and the problems that may be faced in the collision test. Of course, if you want to fully understand the information of the BMW i3, you can click on “Full Carbon Body! Review the article “BMW i3 LifeDrive Structure Analysis”.
● Interpretation of collision scores
(Project score/% of total project score: 31/86%)
Note: All scores and percentages are directly derived from the E-NCAP report.
Frontal collision with 40% overlapping deformable barrier
Deformable mobile barrier side impact
Whipping test score
(Project score/% of total project score: 40/81%)
Child protection status
18 months child
Child safety seat function
Evaluate how the child seat is installed
(Project score/% of total project score: 21/57%)
Active safety technology
(Project score/% of total project score: 5/55%)
Speed limit (active control/reminder)
Electronic Stability System (ESC)
Seat belt reminder
★ Frontal collision with 40% overlapping deformable barrier
★ Side collision with deformable mobile barrier
★ Side column collision test
For the BMW i3, the side-pillar impact test is not only a test of the vehicle’s ability to protect the driver, on the other hand, the body structure is also a test for the protection of the battery assembly that is laid down on the bottom of the car, but unfortunately, E- NCAP's crash test did not specifically explain this. In the future, this link needs to be improved in the crash test of new energy vehicles.
★ Whiplash test
In the above article, we mentioned that the battery laid on the bottom of the car can keep the center of gravity of the vehicle in a low position. In the event of a frontal collision, the rear of the car will not rise significantly, but from the front of the video. The 40% overlapping deformable barrier crash test can see the posture of the rear of the vehicle, which is related to the weight of the vehicle and the length of the body. The side-column collision test that started at 1 minute and 26 seconds in the video resulted in a “weak” evaluation of the dummy's chest. From the perspective of the car, it can be seen that the door trim panel squeezed the dummy's chest during the collision. Pressure, which also directly leads to the risk of chest injury.
★ Pedestrian protection
In the previous test, the performance of the BMW i3 was relatively stable. If this state can be continued in the two tests of pedestrian protection and active safety system, then it should not be a problem to get a five-star score. Let’s see what it is. In which details are points lost.
★ Active safety system
The BMW i3 only got a four-star score, largely because this car lost more points in the evaluation of pedestrian protection and active safety system. Among them, the evaluation of pelvis and active safety in the pedestrian protection test In the system test, there was no score for the evaluation of the speed assist system, which resulted in only half of the total score for the two tests.
The carbon fiber body and battery that we were concerned about before performed well in the crash test, and the vehicle's protection of the dummy is also relatively comprehensive. We also found that the thermoplastic body cover used in the BMW i3 has good toughness. Even if it is a strong impact like a side collision of a deformable mobile barrier, there will be no obvious wrinkles on the surface, which will be seen in the future. In the process of using the vehicle, it can reduce the maintenance cost of the vehicle.
Although the BMW i3 successfully passed the E-NCAP crash test, we still hope that a special test system can be introduced for a new energy vehicle. After all, the problems faced by the new power system in a collision still need to be targeted. The verification can avoid accidents to the greatest extent. (Photo / Li Boxu, the home of the car)