主题：【原创】自动挡和手动挡那个更省油？ -- Highway

欧系车，象奥迪、帕萨特、高尔夫的手排车，我半夜时开总要一脚踩到转速指针快进红线区时才升档，二档就轻松过百公里，爽啊。那种装了所谓“手自一体”的东西实在就是鸡肋，虽说也可调为所谓“运动模式”，但我开过的这些个车里没一辆能支持到4、5千转的。

再说了，没有了这个那个的机械装置，开车时候就是木噔噔地油门刹车，淌车河的时候让人家MM怎么对你产生景仰感啊？

所谓的Drive for fun。

美国84%的汽车现在都配备自动挡（如果我没有记错的话）。因为大多数人开车图省事。并且开自动挡的车，可以一边开车，一边吃东西。这点对于美国人来说非常重要。即使不吃东西，他们那只手还要打电话呢，所以手动档现在不是主流了。

油耗要比在高速路上要大.

喜欢。觉得Multitronic生猛不足，不如手挡“脆”，不如手挡“爽”。

现在大众/奥迪最牛的Transmission是所谓的DSG(Direct Shift Gearbox )，从技术上讲，可能是自动/手动的最佳组合了。

So, let's get technical. . . 

The box uses three shafts, but the secret (well, not really a secret but kept well hidden since 1940) is contained in the use of two clutches and two rows of gear ratios ?C 1, 3 and 5 on one shaft and 2, 4, and six on the other.

Throughout its operation two adjacent gears, one on each shaft (say 2 and 3), are meshed and turning but, as each shaft has its own clutch, only one is transmitting power to the final drive.

In essence, second gear is driving the car while third is pre-selected. When either the auto or manual shift does its job one multiplate clutch is instantly disengaged and the other takes the drive with the intervention of electro-hydraulic control.

The same thing happens during downshifts; so, you're not so much changing gear as swopping clutches. There is, Audi says, some overlap but slippage is anticipated and controlled.

In automatic mode, the driver can shift to the ultra-sporty 'S' programme in which upshifts are significantly retarded, downshifts advanced and the shifting process accelerated.

[IMGA]http://www.fast-autos.com/Assets/golftdi-dsg.jpg[/IMGA]

A remote, one-touch function accessed via the shift paddles on the steering wheel in addition temporarily calls up the manual mode, even in automatic modes D and S.

And a final touch to what is already a superb gearbox: the car comes with Formula 1-style launch control. It works like this. . .


While stationary, deactivate the traction control system that would normally reduce engine power as soon as a wheel starts to spin and slow the car.

Hold down the footbrake and simultaneously increase engine speed.

When the lights change, lift off the brake and press the accelerator hard.

All four wheels bite the tar and suddenly all other traffic is shrinking in the rearview mirror.

Hey, is this fun or what!