Mazda Creates The Holy Grail Of Gasoline Engines – HCCI SkyActiv-X

Mazda Creates The Holy Grail Of Gasoline Engines – HCCI SkyActiv-X

Hello, everyone and welcome. In this video
we’re going to be talking about Skyactiv-X, Mazda’s revolutionary new engine which they say they’re going to be implementing in the year
2019 as a part of their overall vision looking out towards the year 2030 which they are calling “Sustainable Zoom-Zoom 2030”
(I’m not making that up.)
That’s the ridiculous name that they came up with but anyways the name is silly the technology is not the technology is very cool, so
The engine basically is running HCCI –
“Homogeneous Charge Compression Ignition”
and this is kind of the holy grail of
gasoline engines because it’s the best of both worlds
when comparing a gasoline and a diesel engine. So a quick overview of how this works I do have a separate video
Explaining HCCI engines, but what Mazda’s doing is a bit different so a gasoline engine has a homogeneous charge meaning
you’ve got air and fuel mixed in there
and you ignite that air and fuel with a spark
A diesel engine controls ignition by when it injects fuel so your using compression ultimately to ignite it
You inject in that fuel and the temperature and pressure is hot enough that that fuel ignites as it’s sprayed into the cylinder
now homogeneous charge compression ignition
engines have that mixture of air and fuel already in there of gasoline and as it’s compressing that pressure from
Compression is what ignites that Air & Fuel mixture
Now as you can imagine
timing is going to be more challenging with this because you can’t control timing with a spark or when you inject fuel it’s
Simply based on the temperature inside of this chamber when that temperature reaches the point that it can ignite everything everything ignites
you know mix with that pressure and so
The the challenge is of course controlling that internal temperature so you can use EGR to regulate it, there’s different methods
You can use valve timing
In order to regulate the temperature within there and make sure you have good timing to be able to use this feature
So the biggest challenge with HCCI engines is of course controlling that internal temperature and making sure you have the range
HCCI is possible if it’s too cold you run into ignition problems, cold starts are a great example
If it gets too hot you start to have engine knock unpredictable timing and you don’t want that to occur either
Now Mazda said “Wait a minute.” You know we don’t have to have this all-or-nothing engine. How do we fix this range?
Well, you throw in a spark plug
So you kind of go back to the old way of just a traditional gasoline engine
And that’s how they solve this issue of you know for example a cold start if you have super cold ambient temperatures
Which aren’t conducive to having this HCCI function running if you’re really high load high RPM
You can use a spark ignition
To you know make sure that your timing is perfect
When you’re cruising down the highway when you have Low load scenarios
And you want ultimate efficiency you can switch into this HCCI mode
Where now you have you know a much more efficient Mazda says that it’s twenty to thirty percent more fuel efficient than their current
Skyactiv Gasoline engines so a huge efficiency improvement
You know when they’re able to run this method this method of combustion
Now this is basically. What we know
And over here is more speculation on my part because Mazda hasn’t released all that much information about this engine
So take it with a grain of salt
But it’s kind of cool to think about the ways that they’re going to be controlling this engine some of this stuff
We do know some of it
We don’t know kind of works through it
But basically when this engine is running in a gasoline mode
What I would imagine they’re doing is lowering the effective compression ratio. So when you’re running the engine on compression ignition
You want a higher compression ratio to be able to ignite that air/ fuel mixture
Now they haven’t released what the compression ratio is there’s some sources out there saying it’s 18:1
Mazda doesn’t have it directly stated, but let’s just assume
It’s 18:1
When it’s running in this HCCI mode in the gasoline mode where you’re using a spark to ignite it
You’re going to lower the effective compression ratio by opening up that intake valve during the compression stroke
And this is what they do with their current Skyactiv engines
It’s called the Atkinson cycle, and so it allows you to have a lower compression ratio
And then a higher expansion ratio which is an efficient way to run it
but of course if you had for example an 18:1 compression ratio
You would have knock and pre ignition problems and so in order to mitigate those issues
You lower the effective compression ratio by leaving that intake valve open during compression
And then have less air and fuel overall to combust
And you’re also going to run at a richer or stoichiometric air fuel ratio and Mazda has announced that these engines will be supercharged
So you’re kind of going to get the best of both worlds
Where you can have power when you really want it
And then you can be super efficient when you don’t need that power and run it into this homogeneous charge compression ignition mode
Now one of the benefits of this compression ignition
Method is that you’re able to run Super Lean air/fuel ratios
Leaner than you otherwise
could run and ignite with a spark. A spark wouldn’t be enough to ignite it you need these higher temperatures and higher pressures from
Compression in order to ignite that Air fuel ratio and so this allows them to run
You know this is what gives you that major boost in efficiency
You’re running super lean you’ve got a high compression ratio and overall you’re going to get a twenty to thirty percent more
Fuel-efficient engine as a result. Now Mazda stated there are two major challenges
with this type of engine
The first is this range as we talked about earlier and the way they really address that is with a spark plug
but that introduces the second issue, which is how do you switch between spark and
Compression ignition and have that be seamless and smooth
and they haven’t really said how they’ve done this but they have stated that there is this method of
How this engine can run where you use the spark plug to control compression
And I’m guessing that that is part of how they’re addressing this seamless
Switch between when they’re running it on spark vs. when they’re running it on compression
So how this works is this kind of intermediary mode is when you’re compressing that air / fuel mixture
The spark is going to start the combustion
So you’re going to have you know a somewhat richer air / fuel mixture that can have a spark ignite it
The spark’s going to start the ignition
And then that flame front is going to start to expand out. So as that flame propagation is expanding Outward
It’s going to be increasing the pressure in the entire cylinder. As you increase pressure
In the entire cylinder you increase the temperature as well
And so all of the rest of the cylinder reaches a pressure in the temperature at which everything simultaneously
combusts and so the spark plug is
controlling the timing of compression-ignition
SPCCI. So that’s where SPCCI comes from. Ah-ha!
and I believe that that’s probably something to do with their switch between
Using compression to ignite versus using a spark to ignite it
So thank you guys for watching and if you have any questions or comments feel free to leave them below

100 Replies to “Mazda Creates The Holy Grail Of Gasoline Engines – HCCI SkyActiv-X”

  1. Good video but you do what too many amateurs do. You can't speak without waving your arms all over the place. Stop it!!!!! Put your hands in your pockets to wean yourself of this most annoying habit…. Watch a TV show where a speaker is presenting something. Are they as animated as you or do they sit quietly and just speak? Learn this bit about professionalism and better yourself. Try not to be insulted younger brother. You are just a kid and have a lot to learn.

  2. What a load of decadent BS. The fundamentals of this technology is over a century old and its days are numbered. All they are doing is moving deck chairs on the Titanic.

    Too many moving parts… too expensive to maintain compared to an electric motor that never needs servicing.

  3. 30 years ago may have been the right time for new ideas for petrol based combustion engines. Honda was developing the VTEC ideas in the 80s. Interestingly Mazda put out the Miller-Cycle engine back then and I was a huge fan of it but sadly that grand innovation was not received well by the public – and not progressed. If anything, this news just goes to re-affirm the mindset of a company that persisted (and succeeded) with the Rotary engine when others had given up.

  4. How is this different from just a normal gasoline engine which happens to have a really high compression ratio?

  5. Twin engines gas/electric are the future of motor designs not this garbage. Volvo is ahead of everyone by about 3 years. The T8 is the future

  6. Not really a vcr…but if this engine works, Mazda is the only company to take things further under the hood without going hybrid or electric.

  7. Interesting. For the new design, marketing will sell tens of thousands, and The nearest competent service technician to keep it at optimum is located where? Service & maintenance costs are reduced or higher? TCO comparing today's model to new one will be?

  8. Will electric cars ever be an appealing alternative to gearheads like me? Will they ever be Not looking like a lady-shave or jam packed with gadgetry and AI?
    I want something robust and basic that lets me do the driving and that doesn't have a touch-screen or WIFI.

  9. How is it that these people are not aware of the MYT Engine by Rafael Morgado.
    His engine makes reciprocating engines obsolete and completely 19th century.
    Think Power to weight ratio 20:1, 150 pounds. 12° dwell, 850 in.³ displacement, ergo 815~ horse power at idle speed of 800~ rpm. 4000 horses at 3000 RPM. Naturally aspirated
    Oil and air cooled with only 13 moving common automotive parts.
    And it’s only 14“ x 14“ cylindrical internal tyroid combustion chamber engine.

  10. Seems similar to Mitsubishi’s attempt with the GDI technology that allowed the engine to run lean in low speed operation and switch to homogeneous stoichiometric mode at higher loads, with resulting variable compression ratios that could run higher than 14.7:1…

  11. Here is the question no really. In a situation where it would be impossible to maintain these obviously elaborate electronic nannies how would this technology fare?

  12. You tube better be paying your ass good coin for teaching us these engine setups …. bless your heart for going out of your way to teach people about engines

  13. Huh? You said the diesel injects when the piston reaches the end, but that's very much not how everyone else I've seen explains diesel engines. The fuel-air mixture is injected before that, so that the compression can heat it up and ignite it. The kind of pressure you'd need to inject it when that piston is nearing the top is enough to ignite it, so in rushing to inform your viewers about this new engine type, you've misinformed them about diesel.

  14. Efficiency is 20-30% more but when the valve is open to reduce compression ratio wouldn't the air fuel mixture just escape or reducing the efficiency in term of fuel consumption?

  15. Biodiesel doesn't spew toxic fumes like conventional diesel. Traditional diesel engines create combustion thru compression.

  16. Cars in India are running on 'air,'….airliners are now running on compressed air (Over Unity ??), The Merlin engine in the WWII P-51's ran on water…..only using gas to keep the Rothschilds, et al, rich and countries like Saudi Arabia viable.

  17. Commentators say that these engines will be prone to failure and wear. Be sure that Mazda found solutions and made a lot of testing to ensure that their technology is reliable…

  18. I'm guessing if the had YouTube just after the ICE was invented someone would be pushing this new "Holy Grail" of Horse Technology.

  19. Toyota's New Dynamic force vs Mazda's Skyactive which engine is better in power, torque, fuel economy, maintenance, and long life ?

  20. That's a bet on fossil fuel remaining the primary energy source for automobiles. Emerging highway technologies – contactless mobile re-charging – graphene batteries – induction motors…etc. HCCI may well be the Betamax of combustion engines – and we know how that fared in the video world.

  21. i guess gas prices are certainly going to shoot through the roof for the next 10 years then! Good buy currency, hello war

  22. Why can't we just inject the petrol at the ignition phase, like at diesel cars? Because that way you wouldn't need to worry about the timing. Does it have to do something with the fuel?

  23. Lean burn mixtures generally result in extremely HOT combustion chambers, 'over-fueling' reduces combustion temperatures via the expulsion of 'unburned' fuel gases … any idea on the internal cooling requirements of the HCCI engine?

  24. Many years ago BMW made a 3 cylinder engine diesel that got a hundred 134 miles a gallon the technologies always been out there but the people that run the world just want to bleed the working-class dry

  25. Anyone remember Mazda's rotary engine that was supposed to be cleaner, quieter and get better fuel economy than the piston engine ?I would avoid cars powered by these engines at least until it's proven reliable and inexpensive to maintain.

  26. Nothing new, but good vid. Pv= n rt. Study helhomlz thermodynamic entropy engine. At least this mazda motor wont give you cancer like those electric ones!

  27. When a battery has 10% of the energy density of a fossil fuel we may see practical electric cars in any real world application.

  28. Engines sleeves will be thicker and heavier to withstand higher temperature and pressure which may be more than Diesel engines.Otherwise,there could be explosion!.

  29. I can see a lot of early compression ignition before top dead center happening with that engine. Or at least some.

  30. I see abundant problems, cost, maintenance, and durability issues. Stronger engine, supercharger, and mild hybrid components required. At the end of the day negligible savings.

  31. It be an awesome idea if Mazda uses this same engine in a pick up truck. Offer it with either manual or automatic transmission

  32. Hi guy I have confused about high compression ratio. Is it mazda give any detail about how to get it? Since I think about improve high stroke or volume.

  33. The more efficient ICE technology becomes, the less practical electric vehicles will be. Don't forget the upcoming mileage tax on EVs!

  34. This engine is a combination of many known working engineering principles. Direct fuel injection, forced induction, variable valve timing and multi spark ignition systems aren’t new or rocket science. Mazda just put in all in one package. VCR is not difficult to achieve when using forced induction in the first place,it’s all about boost control. You’ve already answered your own questions about this engine in your other videos,don’t overthink it (like Nissan did with their VCR engine)

  35. This system really reminds me of an Advanced primer ignition (API) blowback action. The results and mechanics are different, but it is about pre-igniting the action to achieve efficiency. In firearms the input is always the same (hopefully; it is really bad if the ammo is inconsistent with this system) which means the limitation of such a system is that the RPM varies dramatically with the size and pressure of the round, but it makes the cannon smaller, lighter, and reduces perceived recoil. API blowback fires the round as it is being chambered and is a careful match of chamber pressure to springs and inertia, get this wrong and you fire out of battery which will wreck the gun and can be very dangerous.

  36. I suspect head gasket and heat issues with super high compression and lean mixtures. I hope it works and is proven reliable.

  37. On the one hand, I’m glad Mazda seems to be funding its engineering department so well, but guys, throw your marketing team a bone. Sustainability Zoom Zoom? Skyactive? Are the engineers’ kids in charge of naming their projects?


  39. Reliability is ecological. Pretty much everything to improve MPG or reduce emissions is always done at the expense of added complexity ie. less reliability. The owner will pick up the bill. So, no thank you. Everything needs to be reliable, repairable and recyclable. Small gasoline turbo won't use any less fuel, but will be less reliable.

  40. Can you please say how and when the spark ignition will take place ? How spark plug knows that its time to spark?

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