Dynamic Cylinder Deactivation

[Heihetech]

Shovel,

Thanks for the correct guess, and fully understand DCD into the inner core.
DCD does Has "AIR-HYBRID" Function to Recover Residual Heat in the Cylinder.
I name such function as "AIR-HYBRID", which is a special function of DCD ----
Implementation of “Air-Hybrid” with cylinder residual heat recovery.

Under the control of the DCD product, cold inlet air will become the
working fluid of the engine under DCD control, absorbing residual heat inside
the cylinders, thus expanding and contributing positive engine work, at least
some less negative work from compression that causes thermodynamic loss
(Note that traditional "air spring" is never an idea one.). Such an innovative
“Air-Hybrid” mechanism would not only increase engine efficiency, recover
residual heat and obtain extra power, but also could implement forced internal
air-cooling result inside the cylinders, avoiding engine knocking and partial
overheating, and reducing the heat loss from the radiator.

In just one word, the overall result of DCD is quite positive and effective.

[kurzer]

i still want to buy it. can u say when and where it will be possible?

[euromodder]

Originally Posted by Heihetech

No! Something you have posted belongs to 30+ years old traditional cylinder
deactivation, nothing new, just the VW product is new. How much would you
expect to pay for such outdated technology?

Why would you call it outdated technology ?
There aren't or weren't many cars with this feature - certainly not in its displacement range.

It goes well beyond switching off injectors while keeping the rest of the engine operating normally and calling the result an air-hybrid.

VW could have done that in the blink of an eye.

You must pay some $16,000, or $2000 to trade-in your used car to get it, not cheap.

The rest of the car will also be new

Technically, it's 50% deactivation is the number that always trend to over-
deactivation, making engine power too weak to do regular driving.

Apparently, it works just fine with half the cylinders out of action.
1250-4000 rpm is in the pretty useful range, and 100 Nm torque should be enough to accelerate a compact car when you're not pushing it.

It effectively turns the 1.4L into a tiny 0.7L engine, which should be powerful enough to keep the compact car rolling.

Does it deactivate 25%???

No.
Doe we need that ?
The savings would be less, and imbalance could occur - though VW has plenty of expertise with triples .

The range where 25% deactivation would be useful is likely pretty small.
When accelerating swiftly, it'll need all four pots.
Cruising, it only needs 2 to sustain speed.
When and how long would it need to use 3 cylinders ?

Does it deactivate every cylinder alternatively??? NO! It only shut down 2 fixed inner cylinders, making them over cooled and suffering abnormal wear

.
The 2 inner pots also run the hottest in normal operation.

I'm pretty sure this is what VW came up with after thorough research into the mechanical and thermal stresses of different possible configurations for cylinder deactivation - they've got to warranty it for a couple of years.

[t vago]

Originally Posted by Heihetech

Shovel,

Thanks for the correct guess, and fully understand DCD into the inner core.
DCD does Has "AIR-HYBRID" Function to Recover Residual Heat in the Cylinder.
I name such function as "AIR-HYBRID", which is a special function of DCD ----
Implementation of “Air-Hybrid” with cylinder residual heat recovery.

Under the control of the DCD product, cold inlet air will become the
working fluid of the engine under DCD control, absorbing residual heat inside
the cylinders, thus expanding and contributing positive engine work, at least
some less negative work from compression that causes thermodynamic loss
(Note that traditional "air spring" is never an idea one.). Such an innovative
“Air-Hybrid” mechanism would not only increase engine efficiency, recover
residual heat and obtain extra power, but also could implement forced internal
air-cooling result inside the cylinders, avoiding engine knocking and partial
overheating, and reducing the heat loss from the radiator.

In just one word, the overall result of DCD is quite positive and effective.

If you're not deactivating at least the intake valve, you're not going to see much of an increase in fuel economy.

First of all, traditional cylinder deactivation schemes do contribute to overall engine efficiency in that the firing cylinders in a variable displacement engine have higher peak compression pressures than with a similar engine with no variable displacement scheme in place. This is in contrast to this item: link

Second, pumping losses are less with a traditional cylinder deactivation scheme than with this DCD gimmick because the deactivated cylinders do not pump air. Therefore, they, unlike DCD, do not contribute to forming economy-robbing engine vacuum, nor do they contribute to economy-robbing exhaust flow.

Third, since there is no airflow through the deactivated cylinders in a traditional cylinder deactivation scheme, the deactivated cylinders will approach average coolant temperature. This is in contrast to this DCD gimmick, where airflow through deactivated cylinders will actually cool the cylinders below average coolant temperature, and will cause increased wear of piston rings. This is the so-called "thermodynamic expansion" mentioned with DCD.

[t vago]

Originally Posted by Heihetech

Kitteh head, you always sounds awful that no one is willing to hear from you!
Please get out of DCD THREAD that introduces nice affordable fuel saving
technology. Even you don't like, hate, don't understand it, DCD skill works in its
way, not the way you imagine. DCD is always effective even you feel not.

Why can't you answer the questions? These things I speak of are MANDATED by Federal Law.

In fact, OBD II misfires are rather well described in automotive engineering textbooks.. This DCD thingy is designed to deliberately cause what would appear to be "Type A" misfires to the engine computer.

Originally Posted by Heihetech

Those stupid questions should go to ask the car manufacturer themselves. I
just want to tell you that they are NOT licensed to use DCD patent yet. The
patent means I have but others include you don't have. Wish you will not so
jealous to it.

Anyway... How do your device somehow not throw OBD-II misfire codes or fuel injector malfunction codes or catalytic converter monitor fail codes?

[t vago]

Originally Posted by Heihetech

Does it deactivate every cylinder alternatively??? NO! It only shut down 2
fixed inner cylinders, making them over cooled and suffering abnormal wear.

Uhm... How does stopping all airflow within a cylinder cause it to abnormally cool, while allowing airflow at ambient temperature to flow through the cylinder not cause it to abnormally cool?

Originally Posted by Heihetech

Does it deactivate every cylinder alternatively??? NO! It DCD controls vary from cycle to cycle, while mechanical control can not
act very fast. Or it would wear out soon. Yet electronics based DCD lasts
almost forever, at lease the life time of vehicle.

Prove it. Show something other than marketing hype or your own anecdotal experiences.

[Heihetech]

"Why would you call it outdated technology ?"

Because it's over 30 years old and there's some newer advanced technology
called DCD.

"There aren't or weren't many cars with this feature - certainly not in its displacement range."

This might be true in Europe. But in US, it started in 1980 from GM. Nowadays
there are at least 20 to 30 products by GM and Chrysler, most of them belong
to V8 products. Did any of them claim some significant fuel savings? NO! AND
WHY? Most of time the nice function is OFF, NOT USEFUL. Hope VW's
4-cylinder solution will fall into such case due to even less engine power. The
benefit of VW's new product may not come to the user, but come to promote
its product sales and stock price.

So if you really like this "new" technology, why not buy one and try it? and let
all of us know your test result. Before you spend some $16,000 to try it, or spend an EXTRA (I missed this last time!) $2000 to trade-in, you may wish to
try DCD with only $500 to retrofit your existing vehicle, with more effective
result. From its first day, DCD works on 4-cylinder engine.

[Heihetech]

marketing post removed by admin

[Heihetech]

Originally Posted by t vago

Uhm... How does stopping all airflow within a cylinder cause it to abnormally cool, while allowing airflow at ambient temperature to flow through the cylinder not cause it to abnormally cool?

Prove it. Show something other than marketing hype or your own anecdotal experiences.

Sorry, no time to answer you due to busy DCD product development.

[marketing language removed by admin]

Please don't forget all the engines are designed to intake cold air, it happens
all the time unless you intentionally block it!

[MetroMPG]

Heiheitech:

You appear to be ignoring a potentially critical question (asked several times) regarding the impact your product will have on OBD-II engine management.

It seems reasonable to expect the car's stock computer will not like what is being done under your approach.

Have you registered your product with the U.S. EPA?