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Old 09-05-2011, 08:04 AM   #1
AVANTI R5
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Default Volkswagen Brings Cylinder Deactivation Technology to the 4-Cylinder Engine






http://www.autoguide.com/auto-news/2...er-engine.html

Quote:
Cylinder shut off technology has been a staple in fuel-saving technology for many years now but until now it has yet to make its way into a four cylinder engine. At least not until now.

Volkswagens 1.4 liter TSI engine will be the very first four cylinder to feature cylinder deactivation as two of its cylinders will shut off when operating at low to moderate rev ranges, resulting to a decrease in average consumption by 0.4 liters/100 km, or 2 mpg. In the illustration provided above, the left half shows all cylinders in operation, while in the right side, we see a diagram of cylinders 2 and 3 deactivated. Cylinder shut off is activated when engine revolutions are between 1400 to 4000 rpm while torque is between 25 to 75 Nm, or between 20 to 50 pound feet. Upon urgent acceleration, cylinders 2 and 3 will wake up from its nap to give the car its oomph.

If the 1.4 TSI is coupled with a start/stop system to prevent consumption during idling, fuel economy is expected to improve by another 0.6 liters/100 km, or 3 mpg.

Expect these engines to debut by the beginning of 2012.




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Old 09-05-2011, 08:17 AM   #2
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Volkswagen will introduce cylinder shut-off technology to its new 1.4-litre TSI engine from 2012.
VW is the first manufacturer to implement the fuel-saving technology in a mass-produced TSI engine, a system that shuts off two of the four cylinders under low to medium loads, between 1400 and 4000rpm.
Volkswagen claims that the EU6-compliant unit saves 0.4 litres (0.09 gallons) of fuel per 100km, rising to 0.6 litres (0.13 gallons) per 100km when combined with VWs stop-start system.
VW also says that the benefits become more obvious when driven smoothly and slowly: At 50 km/h, in third or fourth gear, savings amount to nearly one litre per 100km.
If driving style is deemed by the system to be too aggressive, the shut-off functionality is automatically suppressed.
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Old 09-06-2011, 10:12 AM   #3
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Interesting. VW has been studying this for a long time. They initially resisted it because of the complexity of balancing the engine. Instead VW was one of the first manufacturers to adopt direct injection based on the cost-benefit analysis of both approaches. Here's some data from a study they did about 10 years ago:

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Old 09-06-2011, 10:16 AM   #4
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it made sense on a v8, not as much on an i4.

i'd rather see start/stop (which i know they're capable of because the new 911 has it) than cylinder deactivation.
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Old 09-06-2011, 10:24 AM   #5
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Originally Posted by nhat View Post
it made sense on a v8, not as much on an i4.

i'd rather see start/stop (which i know they're capable of because the new 911 has it) than cylinder deactivation.
Good call. I see you have spent thousands of hours with modeling software, research labs, and proprietary data to make these statements. You might want to call up VW and let them know that they've made a bad decision.

You don't know what you're talking about, but in your defense it's not really your fault because you aren't privy to their internal R&D or knowledge of their cost structure.
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Old 09-06-2011, 10:47 AM   #6
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Quote:
Originally Posted by arghx7

Good call. I see you have spent thousands of hours with modeling software, research labs, and proprietary data to make these statements. You might want to call up VW and let them know that they've made a bad decision.

You don't know what you're talking about, but in your defense it's not really your fault because you aren't privy to their internal R&D or knowledge of their cost structure.
i never said it was a bad decision, i only stated that cylinder deactivation makes more sense on a v8 in my opinion.
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Old 09-06-2011, 11:22 AM   #7
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Originally Posted by nhat View Post
i never said it was a bad decision, i only stated that cylinder deactivation makes more sense on a v8 in my opinion.
To which, you are correct. Don't mind arghx7.
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Old 09-06-2011, 12:26 PM   #8
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Cool! Yet another system to fail in your VW.

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Old 09-06-2011, 12:36 PM   #9
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Edit: Meh, not worth it.
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Old 09-06-2011, 12:41 PM   #10
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......
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Old 09-06-2011, 01:00 PM   #11
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Huh, I thought VW's randomly deactivated cylinders all the time? The 1.8t guys call it a "blown coil pack".
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Old 09-06-2011, 01:17 PM   #12
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Quote:
Originally Posted by NemesisWRX View Post
Huh, I thought VW's randomly deactivated cylinders all the time? The 1.8t guys call it a "blown coil pack".
Actually I think that's the difference between "cylinder deactivation" and "zylinderabshaltung".
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Old 09-06-2011, 01:33 PM   #13
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Originally Posted by Einzelherz View Post
To which, you are correct. Don't mind arghx7.
correct based on what data? shutting down 4 out of 8 cylinders must be better than shutting down 2 out of 4? because 4 is a bigger number than 2? without data on the fuel economy improvements vs the cost of each system, there's really nothing to support that overgeneralized claim. It might be "better." It might not. It probably depends on the application.
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Old 09-06-2011, 02:59 PM   #14
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Originally Posted by NemesisWRX View Post
Huh, I thought VW's randomly deactivated cylinders all the time? The 1.8t guys call it a "blown coil pack".
QFTMFT!
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