Dynamic Cylinder Deactivation
 

Dynamic Cylinder Deactivation has been made into aftermarket engine
retrofitting products ----- "DCD Air-Hybrid Controller".

DCD stands for Dynamic Cylinder Deactivation, the latest fuel saving
technology invented in 2008. Traditional cylinder deactivation started
in 1980s, and has been verified and proven over 30 years. But it has
never been made into aftermarket retrofitting kit until now.

"DCD Air-Hybrid Controller" is an electronic control kit for automotive
engine retrofitting. It will bring us 10% to 18% fuel economy gain.
Payback time after installation will be less than one year*. First Prize
winner of "Rev Up Fuel Efficiency" design contest in Detroit. It is the
Most affordable and most effective fuel saving solution.

are you selling something? is this and advertisement? Any more info ?

well that was weird.

Dynamic Cylinder Deactivation
 

A good technology must be turned to good product. Then Dynamic
Cylinder Deactivation technology must be made into DCD Controller.
That's our effort during the past 2 years.... Now we almost get the
engineering sample ready. The post is intended to see if any one likes
it and willing to play this kind of new gadget for fuel saving.

DCD Controller
 

DCD Controller is designed for general drivers who wants to save fuel
but don't have hypermiler skill, or for hypermilers who have to drive
in stop-and-go city traffic.

An actual brochure would be great.

Here's da link:

Dynamic Cylinder Deactivation with Residual Heat Recovery

It doesn't mess with the valves like all other DOD; it cuts injectors BUT not like we tried with switches or unplugging them.

I dunno, I want to believe, but I have to wait until it has been tested. You could always send me a unit to test. :thumbup:

Dynamic Cylinder Deactivation
 

:thumbup: Thanks! Frank,

You not only understand "Dynamic Cylinder Deactivation" as a technical term,
but also its technical details and background. So you may be quanlified to try
our product once it comes out.

I think "Dynamic Cylinder Deactivation" is very important to all of DIYers and Ecomodders. That's why I started this thread.:thumbup:

Dynamic Cylinder Deactivation
 

Sorry! There's no product to sell this time. But the great idea of "Dynamic
Cylinder Deactivation" is worth to be sold to Ecomodders, letting everyone
enjoy the benefit of fuel savings from "Dynamic Cylinder Deactivation".:thumbup:

Dynamic Cylinder Deactivation
 

Nothing weird with "Dynamic Cylinder Deactivation" itself. Something weird is
it has been invented over 2 years ago after winning the First Prize in 2008,
but still has less people get to know it. I think "Dynamic Cylinder Deactivation"
is the technology every DIYer and Ecomodder need to know. Everybody is
welcome to explore the fuel saving benefit of DCD.

Just read the link Frank posted. I thought about this idea one time, but didn't have a good answer for the O2 sensor problem--looks like you figured it out, using a Wideband O2 sensor and skewing the value as needed to provide a typical O2 sensor output the ECU will understand. Very cool.

I'd love to see some real numbers behind this. I bet adding a port-by-port Water Injection system would substantially improve the workability of the offline cylinders (from steam vaporization). The use of microprocessor is good too, I was dreaming about using an Arduino (8-bit, can have similar # of digital I/O ports if you use the ATmega2560) due to the open-source community surrounding it.

Wow, guys really good at repeating key search terms multiple times in every post.
Your SEO skills are impressive.

That said, I've also thought a processor skipping every X number of injections would still run smoth at hwy speed but save fuel. An open source / arduino version would be thoroughly ABA tested here.

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

This website has a number of factual mistakes in it.

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 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 may actually cool the cylinders below average coolant temperature. This is the so-called "thermodynamic expansion" mentioned with DCD.

I'll leave it up to Mr. DCD there to explain how his electronic gadget is going to fool the engine computer from sensing the extra oxygen in the exhaust stream from his DCD algorithm, and fooling the engine computer from applying extra fuel to compensate for that sensed extra oxygen.

You'd be better off checking for correct tire pressure, than with experiementing with cylinder deactivation schemes that do not shut off airflow to the deactivated cylinders.

Dynamic Cylinder Deactivation
 

:thumbup:That's great! Your deep understanding has reached the key point -----
Windband oxygen sensor will guide ECU to close the fuel control loop at
higher Lambda points (Normolized air-fuel ratio). This means less fuel
will be burnt when DCD is on, the reason of fuel saving.

Water injection is also a cool idea, but please be careful don't make the
cylinders too cold. Because intake air already has cooling effect to cylinder,
water injection may cause over-cooling. I think the best way to inject
water is to inject into the hot expanded exhaust, absorbing residual heat
energy from hot exhaust, and then, let the mutilple fluids expand in a
secondary compound cylinder ----- this has become my HEIHE invention
which has been patented.

DCD = Dynamic Cylinder Deactivation
 

Your dream will become true once DCD Controller is installed onto your
vehicle. ABA tests have been done under steady speed mode and stop-
and-go mode around the city block, yielding 8% to 15% fuel savings. At
idle, the savings may go up to 18%.

Yes, its a bit overkill. Give us some hard data (actual numbers) and testing procedures and we may be interested.

Fuel savings form dcd
 

Just see the data posted above. Steady speed is 30 mph, using triplecate
2-way drivings. So each data is an average of 6 single trips. Stop-and-
go test is driving around a retangular street block, start from one corner
and keep tuning right until you go back to starting point, slow down before
each right turn, and speed up after each right turn, keep steady speed
when it reaches 25 mph.

The guage used for test is DFC-1 digital fuel consumption meter, similar
to MPGuino, directly sampling signal from fuel injectors.:thumbup:

If you have just the one O2 sensor controlling all the cylinders, won't the injectors still be squirting fuel into the deactivated cylinders, just less of it? Wouldn't this would cause the active cylinders to run lean?
Should you not have the computer cut fuel & spark to individual cylinders on a rotating basis?

DonR you have it backwards if the O2 sensor is seeing extra air it will add fuel making it rich. Shutting the injectors off no fuel will be injected, if a controller is used it can simulate the correct O2 reading allowing for a switch to skew the results for the extra air. It would be easy to calibrate by running with all cylinders firing get an even reading shut off half see the change in O2 adjust then repete a few times till the change in O2 is ~1-2%.

(O2 mentioned above is not actual O2 but the reading the stock O2 sensor gives.)

Windband oxygen sensor
 

As I have posted, o2 sensor is a WINDBAND OXYGEN SENSOR, it will
cheat ECU to close fuel loop at higher Lambda point, thus less fuel will
be injected. Regular o2 sensor is no longer operable under DCD control,
it must be replaced into WINDBAND OXYGEN SENSOR.:thumbup:

Wideband oxygen sensor
 

As I have posted, the o2 sensor is a WIDEBAND OXYGEN SENSOR. It will
cheat ECU to close fuel loop at higher Lambda point, resulting less fuel
injected. The regular o2 sensor no longer works under DCD control. It
must be replaced with a WIDEBAND OXYGEN SENSOR.:thumbup:

DCD Controller Kit Must be Fully Installed
 

DCD Controller will function to cut the fuel injections first according to DCD
control pattern, then wideband oxygen sensor must be used to close fuel
loop in higher lambda point, or no fuel can be saved.

All in all, DCD Controller will bring DCD technology and its benefit onto any
vehicle once the full DCD Controller kit is installed.:thumbup:

So you're still cutting fuel & spark to individual sensors, but you found a way to keep the other cylinders running correctly by using the wideband O2 to fool the OE computer?

Dynamic Cylinder Deactivation (DCD) and its Controller
 

Sure, I patented Dynamic Cylinder Deactivation (DCD) technology, and
implemented it with affordable electronic retrofitting kit called "DCD
Controller". Cutting fuel according to DCD pattern is the main task, next
task is to close fuel control loop at higher lambda point. I don't care
sparks and ignitions. Waste-sparks will make no problem, right?

You will find "DCD Controller" is the most affordable and most effective
fuel saving gadget. It brings DCD concept into reality.

Traditional Cylinder Deactivation vs Dynamic Cylinder Deactivation
 

To reply "t vago"'s comments below ----

Heat transfer is always bi-directional, so if you think cylinders will be heated
up by coolant, then the heat generated from compression will be transfered
into coolant. This means energy loss into the coolant. In case of Traditional
Cylinder Deactivation, compression happens TWICE in One ENGINE cycle, so
the energy loss will be doubled.

Nothing is perfect in this world, so my online article and DCD itself is not so
perfect, but it does save with very high utilization. Theoratically, as you
have analyzed, Traditional Cylinder Deactivation (TCD) seems more perfect
than Dynamic Cylinder Deactivation (DCD), but it suffers utilization as one
of its killing factors. TCD disables 50% cylinders in the engine, left a power
output of 45%. Such power can't be used under most of driving modes. As
a resullt, TCD has be off most of the time, becoming useless. There seems
always NO sunshine on TCD's "solar panel", where's the benefit?

In contrast, DCD can be turned on most of time, resulting high utilization.
The resulted power level will be from 50% to 100% in multiple stages, based
on the driving need. It makes a good match between engine power and the
load, yeilding maximum savings. There's always sunshine on DCD's "solar
panel".

Further, TCD WON'T be applied to general vehicles on the road by
aftermarket retrofitting. How does it save fuel in no where? NO WAY！

DCD sounds an awful lot like "limp home mode" but that doesn't save any gas...

Got a patent number?

regards
Mech

So I can simply spoof the low coolant/temp sensors and voila! controlled limp home mode?

There is a 2009 patent application...

Dynamic Cylinder Deactivation with Residual Heat Recovery - Patent Application 20100050993

I still dont see how this is going to be plug and play or universal.

By not altering the valves opening with the cylinders being deactivated you are going to screw up the ratio the exhaust gasses being fed through the catalytic converter. This device would lead to operating in a permanent lean mode from the catalytic converters point of view. A large number of catalytic converters need alternating cycles of lean and rich mixtures to operate correctly and avoid fowling. (Note some o2 sensors have their lifespan reduced by operating in excessive lean conditions for an extended period of time as well).

How do you intend to address this and still be able to pass an emissions check?

Could be manufactured as a piggy back device that intercepts signals from the ecm and adjusts them according to it's own programming, making it plug and play.

Wouldn't be a first, by any means.

Dcd controller
 

I think you have got the very point. DCD CONTROLLER has been designed
to work like what you said. That's the way to do aftermarket retrofitting, the
way to introduce DCD into regular engine driven vehicles.:thumbup:

Awesome. Where's my test unit, "for purposes of evaluation"?

Wideband oxygen sensor & DCD Controller
 

ConnClark,

Wideband oxygen sensor will always be operating in excessive lean
conditions, or even in pure air. It is designed like this. Don't worry.

To pass smog check, just switch OFF DCD control, then everything will go
back to it was when DCD has not yet been installed. You may also choose
to physically remove it by reversed "plug and play". DCD Controller can be
bypassed in seconds from its circuit.:thumbup:

Here we may introduce a new term to reflect the feature of DCD Controller
----- “unplug-and-noplay".

plug and play or universal
 

plug and play is not practical bacause regular vehicles have not designed
DCD Controller interface in advance. So 1 to 3 hours of installation work is
required to hook up the connector into ECU control circuit. Totally there are
some 14 wires to connect for 4-cylinder engine. Then, plug-and-play begins,
and one time installation will last forever.

universal problem ----- This is just like the size of T-shirt, one size can't
fit all the market, but 3 to 5 sizes will fit everyone in the market, becoming
universal. DCD Controllers can be made to fit engines with different number
of cylinders and configurations.:thumbup:

Your test unit
 

Please wait until the DCD product comes out. But the fitness from your
diesel vehicle will be a problem, in case it's mechanically injected.

Dcd is intentionally under control
 

"limp home mode" is a trouble that everybody don't want it. BUT DCD IS
INTENTIONALLY UNDER CONTROL, is man-made, is what we want. why?
for fuel saving, in case you don't have a better solution like electric-gas
hybrid. Trying is believing. Be sure you ALWAYS turn DCD function ON,
or you don't save any gas.

If you ever get a patent (not a provisional application) the next step will be EPA certification of your device and it must pass all applicable emission tests or anyone who installs one on their car could face serious fines and penalties.

That is exactly what Virginia told the HHO installers.

I noticed how you answered every other question but managed to avoid the one about a patent number.

regards
Mech

DCD Patent Number
 

I didn’t want to avoid the one about DCD patent number, just because
someone has find it out and posted it before I read your message, no
need to repeat the same number, which I still need to find it out.

Because DCD control will not be always on, I think emission certification
could be optional, not a must. Just switch DCD control OFF, everything
will come back to normal. I passed emission test twice like this.