Dynamic Cylinder Deactivation

[Heihetech]

Originally Posted by deathtrain

All this talk and we have yet to see a product.

Good idea! Without DCD product, DCD dream could not become true. DCD
concept has been made into the first product these days. It is called
"DCD-440" DCD Control System Kit. Here 440 means 4-cylinder and 4th
generation. The kit is composited by several PCBs and cable harnesses that
connect PCBs together and to engine control circuit.

DCD-440 System Kit is suitable for 4-cylinder engine with SFI and regular
heated O2 sensor. Its engineering sample is available now. Road driving test
on a 1.6L AT vehicle results a 9.8% fuel saving at 30 MPH cruise speed.
Stop-and-go test around the city block could go up to 13% savings. I think
I need to find some other vehicles to repeat the tests, thus to verify the
nice fuel saving result. Trying is believing. Is anybody interested in installing
and playing with this magic gadget?

[Heihetech]

Originally Posted by Heihetech

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.

I still want to add something into my DCD TEST SCHEDULE -----

To be as accuracy as possible during the test, cruise control must be always
used to maintain the constant speeds. Once the cruise speed is set, it is not
allowed to change and adjust during the whole test group, cancel and resume
will be used to turn the preset speed OFF and ON after and before each
individual test trip. The only limit is the lowest speed of cruise control, which
is around 28 MPH. So for 20 MPH test, the foot must work hard to keep the
speed constant. Who has a better and more steady solution than foot?
because 20 MPH test is important and could save over 10%.

[deathtrain]

What search engine should we use to find it this product? I just used everyone I could think of and came up with Pixie Farts and Unicorn Milk.

[Heihetech]

Originally Posted by deathtrain

What search engine should we use to find it this product? I just used everyone I could think of and came up with Pixie Farts and Unicorn Milk.

Sorry, DCD Product has not been released yet, so it can not be find by any
search engine. Its engineering sample is available now. But the related
documents need to be prepared, like user manual and installation manual.
I'll get you guys updated. If it's allowed, I can post the picture of DCD
controller system kit here online.

Please contact with me at heihetech@gmail.com if you have specific
question to ask, or would like to install and try DCD engineering sample.

[ghostwalker]

What search engine should we use to find it this product? I just used everyone I could think of and came up with Pixie Farts and Unicorn Milk.-deathtrain

roflmao

Heihetech,
There is a post on this forums regarding how to properly pimp your product on this site. I'm not an admin here but I thought I would point it out. I understand that you are not currently selling them but it still applies IMO.

That said if your product works. I think your test scheme is incorrect. That is using a four cylinder which requires the a significant amount of it's power for normal operation (yes hypermiling reduces needed power in most situations). To me it would better suited to a vehicle/engine combo that was generally overpowered in most situations but occasionally needs full power available. A work truck or a street/strip performance vehicle would be good examples. I think one of those would best show off your product. If you split a V8 in half you get a 4 cylinder (yes that a gross oversimplification) and 4 cylinders push vehicles around everyday. Not so much with 2 cylinders.

While all this arguing does provoke thoughts on the subject until you can provide a test product or a third party documented test it's really academic. Your pimping/defending a product that doesn't exist as far as an end consumer is concerned.

My suggestion would be to donate a prototype (with the understanding that it's a prototype and may be refined further later) to a member (no not me) of this forum or at least make one available at cost to a member. This would be the equivalent of beta test and could provide valuable research for you at a low cost. If members are willing the unit could be swap between member vehicles to try it on a wide variety of platforms.

If your product proves out I'm sure you would find a lot people interested in it here. Don't take this post as bashing I would very much like to see your product proved out. That's my two cents.-GW

[Frank Lee]

Originally Posted by Frank Lee
DCD sounds an awful lot like "limp home mode" but that doesn't save any gas...

Originally Posted by Heihetech

"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.

Am I in error in understanding what this system proposal is and how it works?

Did someone comment on my comment and I missed it?

Alternate cylinder disabling via ignition and fuel cut-offs, in a rotating pattern (not the same cylinders being deactivated all the time), and without valve deactivation... did I just describe limp-home mode or hei's proposal?

I did both. Unless I missed it, this proposal functions the same as limp-home mode. Limp home mode saves NO fuel. Limp-home mode still has pumping losses. That seems to be a difficult concept for many to get.

[California98Civic]

Originally Posted by Heihetech

Good idea! Without DCD product, DCD dream could not become true. DCD
concept has been made into the first product these days. It is called
"DCD-440" DCD Control System Kit. Here 440 means 4-cylinder and 4th
generation. The kit is composited by several PCBs and cable harnesses that
connect PCBs together and to engine control circuit.

DCD-440 System Kit is suitable for 4-cylinder engine with SFI and regular
heated O2 sensor. Its engineering sample is available now. Road driving test
on a 1.6L AT vehicle results a 9.8% fuel saving at 30 MPH cruise speed.
Stop-and-go test around the city block could go up to 13% savings. I think
I need to find some other vehicles to repeat the tests, thus to verify the
nice fuel saving result. Trying is believing. Is anybody interested in installing
and playing with this magic gadget?

Many of us have cars that fit this description. I believe "Christ" said above that he would like to test it. So did "Frank Lee." I have read the whole forum, and from my perch--no expert to say the least--it looks interesting. I'm impressed with the debate. I don't have the AT you refer to here. I have a 1.6L MT four banger. I would be interested in aiding a test, but I'd like to know what you propose and if you are expecting test subjects to accept costs. Not certain I want to saddle any costs other than my time and my vehicle.

[texanidiot25]

Originally Posted by Heihetech

Good idea! Without DCD product, DCD dream could not become true. DCD
concept has been made into the first product these days. It is called
"DCD-440" DCD Control System Kit. Here 440 means 4-cylinder and 4th
generation. The kit is composited by several PCBs and cable harnesses that
connect PCBs together and to engine control circuit.

DCD-440 System Kit is suitable for 4-cylinder engine with SFI and regular
heated O2 sensor. Its engineering sample is available now. Road driving test
on a 1.6L AT vehicle results a 9.8% fuel saving at 30 MPH cruise speed.
Stop-and-go test around the city block could go up to 13% savings. I think
I need to find some other vehicles to repeat the tests, thus to verify the
nice fuel saving result. Trying is believing. Is anybody interested in installing
and playing with this magic gadget?

If you have an example for 8 cylinders, I'm interested.

[Heihetech]

Originally Posted by ghostwalker

What search engine should we use to find it this product? I just used everyone I could think of and came up with Pixie Farts and Unicorn Milk.-deathtrain

roflmao

Heihetech,
There is a post on this forums regarding how to properly pimp your product on this site. I'm not an admin here but I thought I would point it out. I understand that you are not currently selling them but it still applies IMO.

That said if your product works. I think your test scheme is incorrect. That is using a four cylinder which requires the a significant amount of it's power for normal operation (yes hypermiling reduces needed power in most situations). To me it would better suited to a vehicle/engine combo that was generally overpowered in most situations but occasionally needs full power available. A work truck or a street/strip performance vehicle would be good examples. I think one of those would best show off your product. If you split a V8 in half you get a 4 cylinder (yes that a gross oversimplification) and 4 cylinders push vehicles around everyday. Not so much with 2 cylinders.

While all this arguing does provoke thoughts on the subject until you can provide a test product or a third party documented test it's really academic. Your pimping/defending a product that doesn't exist as far as an end consumer is concerned.

My suggestion would be to donate a prototype (with the understanding that it's a prototype and may be refined further later) to a member (no not me) of this forum or at least make one available at cost to a member. This would be the equivalent of beta test and could provide valuable research for you at a low cost. If members are willing the unit could be swap between member vehicles to try it on a wide variety of platforms.

If your product proves out I'm sure you would find a lot people interested in it here. Don't take this post as bashing I would very much like to see your product proved out. That's my two cents.-GW

Thanks for the good suggustion. I had only 4-cylinder vehicles when I start
to play with DCD. So my first DCD PRODUCT, "DCD-440 Sytem Kit", is designed
for 4-cylinder engine. Who would like to try, in case you are willing to do
some ABA tests under various speeds, and have a good digital fuel
consumption meter?

[Heihetech]

Originally Posted by texanidiot25

If you have an example for 8 cylinders, I'm interested.

Please wait for a while, sooner or later we will have 8-cylinder DCD product.