For example, in the United States, the front bumper casing is not a safe configuration, and the United States only uses it as an accessory to reduce low-speed collision losses, so the front bumper is only tested at low speeds, including frontal collisions (10km/h) and sides. Collision (5km/h).
On September 1, 2013, China's "Automobile Protection Bar" industry standard will be formally implemented. The "Standard" mentioned that the collision performance of products should meet the relevant requirements of GB17354-1998.
However, unlike the foreign countries, the pendulum test is used in the country. The estimated collision speed is 4km/h and the side collision is 2.5km/h. Domestic speed measurement requirements are relatively low, perhaps related to the front bumper casing is more likely to be damaged.
In addition to the safety perspective, the development of the front bumper system is now related to air resistance. Studies have shown that for every 0.04 reduction in drag coefficient, it can reduce fuel consumption by 0.5 liters at 130 km/h.
Nowadays, this model will be more conducive to the integration of the front bumper and the body. For example, the drag coefficient of the Mercedes-Benz IAA concept car is reduced to an astonishing 0.19Cd. The new Mercedes-Benz A-class drag coefficient recently listed is only 0.22Cd. The area is also only 2.19 square meters.
However, it should be noted that there are still many solutions to reduce fuel consumption at that time. Although the design of popular cars began to be highly respected in the 1930s, people did not consider changing the structure of anti-collision beams, such as the first streamlined in history. The car's Chrysler airflow still retains the front and rear exposed front bumper design.
As mentioned above, the idea of imprisonment in car design began to be liberated because of the need to promote pedestrian safety. So this transition did not begin until the 80s, such as the Porsche 911. From the early 964s of the early 1990s, the front bumper of the same color as the body was used, and the bumper of the 993 was integrated with the body.
The development of the car front bumper system to this day is directly related to lightweighting, but if we trace the history, we will find that the cause is pedestrian safety protection. The car's anti-collision beam gradually shifts from the exposed mode to the built-in mode, and the outer enveloping gradually changes from a metal material to a plastic material.
For our consumers, the drawback is that it is more vulnerable, but the emergence of multi-level protection systems makes it more secure than ever. Of course, another major benefit of this is that it improves the overall feel of the car design and reduces the drag coefficient.