同级别SUV车顶安全系数比较-用数据说话

为什么要谈车顶安全系数？最近，一辆奔驰C顶翻了奥迪Q3的案例可以说明：因为SUV底盘比轿车高，因此在过弯时或受到外力冲击时，更容易发生侧翻从而会四脚朝天，这时车顶的安全就会保护里面的人员的生存空间。

什么是车顶安全系数？以下是来自于IIHS的说明，大意就是在车顶用一个金属块慢速均匀增加与车重相关的力量，直至车顶出现5英寸（12.7CM）的裂缝为止，记录下出现的峰值。

In the test, the strength of the roof is determined by pushing a metal plate against one side of it at a slow but constant speed. The force applied relative to the vehicle"s weight is known as the strength-to-weight ratio. This graph shows how the ratio varied as the test of this vehicle progressed. The peak strength-to-weight ratio recorded at any time before the roof is crushed 5 inches is the key measurement of roof strength.

为什么IIHS发傻要测这个车顶安全系数？因为原因如下,大意是：每年有几千人因为车辆翻滚而死亡，因此当现现车辆翻滚的时候，车顶要足够强度才能维持人员的生存空间，车顶强度越大，人员因碰到车顶伤害的风险就越小（注：如果车顶破损，人员碰到车顶会被划到）；此外，车顶强度越大，越能减少人员被甩出车外的风险，因为车顶的扭曲会导致车窗，前档或车门的毁坏。

Thousands of people are killed each year in rollovers. The best way to prevent these deaths is to keep vehicles from rolling over in the first place. Electronic stability control is significantly reducing rollovers, especially fatal single-vehicle ones. When vehicles do roll, side curtain airbags help protect the people inside, and belt use is essential. However, for these safety technologies to be most effective, the roof must be able to maintain the occupant survival space when it hits the ground during a rollover. Stronger roofs crush less, reducing the risk that people will be injured by contact with the roof itself. Stronger roofs also can prevent occupants, especially those who aren"t using safety belts, from being ejected through windows, windshields or doors that have broken or opened because the roof has deformed.

以下是常见同级别车辆的车顶安全系数：

SUV             车顶安全系数

Q5                       4.41

GLK                     6.41

QX50                   4

RX350                 4.27

X3                       4.69

XC60                   5.23

对比结果：GLK>XC60>X3>Q5>RX350>QX50