这类变速箱的主要挑战在于一个智能控制换档的软件。如果换档过于频繁,驾驶者可能感觉得到,认为发动机运行不够平滑顺畅。如果换档过少,燃油经济性的好处就不能得以体现。
Michael Ebenhoch, director of ZF's front-drive transmission development, says that with nine speeds, 'we are getting closer to the maximum' for a passenger car. On the other hand, he says, 'the guy who developed the five speed said we don't need six.'
采埃孚公司前轮驱动变速箱研发组的负责人迈克尔??艾本诺克(Michael Ebenhoch)说,九速变速箱“已接近乘用车变速箱的档位极限”,但从另一方面来说,“当年开发五速变速箱的人也说过今后不再需要六速变速箱”。
Drive by Computer
电脑自动驾驶
Traditionally, steering a car has involved a series of mechanical connections that allow the wheel in your hands to guide the four wheels on the road. Infiniti's new Q50 sedan -- which replaces the current G series in the Nissan Motor Corp. luxury brand's lineup -- boasts the industry's first so-called steer-by-wire system, which swaps out those mechanical elements with an all-electronic system.
以往,汽车转向涉及一系列机械传动,让驾驶者通过手中的方向盘指引汽车的四个轮子。英菲尼迪(Infiniti)新款Q50轿车旨在替代日产汽车公司(Nissan Motor Corp.)高端的G系列车型,宣称其在行业内率先使用了所谓的线控转向系统(steer-by-wire system),将转向过程中的机械环节全部替换为电子系统。
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