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VW engine will be the first 4-cylinder in the industry to use cylinder deactivation tech

With more stringent fuel economy standards looming in the U.S. and elsewhere, auto manufacturers are looking to pull out all the stops to improve economy as much as possible. Carmakers are turning to technology like direct injection and automatic start/stop. Several automakers are also using cylinder deactivation on their larger engines.

Cylinder deactivation is something that some carmakers in the U.S. and abroad have used for years. Chrysler has used the technology in its Hemi engines, Honda uses it on some of its V6 models, and Audi will use cylinder deactivation in its new line of “S” performance models.

VW is set to make a first in the automotive market by offering cylinder deactivation on its 4-cylinder models.

The VW tech will turn off two engine cylinders under certain conditions. The engine is called the 1.4L TSI and VW promises that it will offer a fuel savings of 0.4-liters/100km and when combined with start/stop technology the vehicle would save 0.6-liters of fuel. For those more familiar with U.S. mpg ratings, that works out to an improvement of in the range of 
3 to 4.5 mpg on average. 

The engine would turn off two of the cylinders under low to medium loads, and VW says that the tech will meet the future European EU6 emissions standards. The cylinders will be deactivated when the engine is operating between 1,400 and 4,000 rpm and the engine torque is in the range of 25 to 75Nm.

VW claims that operating range applies to about 70 percent of the driving distance in the EU fuel economy driving cycle. VW also points out that as soon as the driver presses the pedal the cylinders will reactivate without the driver being able to tell it happened. The cylinders also would not turn off if the vehicle were being driven in a sporty manner apparently. 

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RE: Really!?
By barturtle on 9/6/2011 4:54:00 PM , Rating: 2
Actually with modern engine control systems, this can be achieved with a bit of programming and engineering time. Quite inexpensive to accomplish.

At low load operation (cruise on on flat terrain) and 1400 rpm it should be as smooth as at low idle.

Looking at the image, they have 1-4 and 2-3 paired, so if you shut off 1-4 and leave 2-3 running you'll have even firing cycles on those two cylinders, and the same if you shut off 2-3 and leave 1-4 running. There would normally be a preference to shut off 2-3 and leave 1-4, as 1-4 are supported by completely separate main bearings, while 2-3 share one in common.

RE: Really!?
By YashBudini on 9/6/2011 10:47:05 PM , Rating: 2
Quite inexpensive to accomplish.

In 2011 the GTI Turbo accomplished traction control by applying brake pressure to individual wheels via computer control. Inexpensive to implement, but that's not the only cost for us.

German hardware has never had the kind of reliability in league with their reputation. Factor in what we'll see of this will be made in Mexico and it will be "Version 1.0" and you should ask yourself if you really want to rush into this.

Why kind of real life savings is Honda's V6 seeing with this technology?

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