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Re: what the heck is SkyActive?

having major resistance to research in general...


Interesting.


...and Mazda in particular since their beltlines+swooshes started making me seasick
Mazda's KODO design might not look good on small cars like the 3, but it works so well on the longer 6.
I think the 6 is one of the best looking mainstream mid-size sedans available today. It's up there with Ford's Fusion/Mondeo.
 

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Re: what the heck is SkyActive?

I agree on the 6, wonderful design!
 

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Mercury C557
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Discussion Starter #6
Re: what the heck is SkyActive?

just gonna leave this here...

Turbo Tech of the 2016 Mazda CX-9: Taking A Closer Look
Why the CX-9 Doesn’t Offer Engine Stop-Start, and More
MotorTrend

Frank Markus - May 23, 2016


Much of the magic in the 2016 Mazda CX-9’s 2.5-liter turbo-four engine happens in the exhaust manifold. Its first trick is to plumb two paths into the turbo, a big one with a flow-control shutoff valve, and a smaller one. Mazda tech guru and former Sport Compact Car colleague Dave Coleman explains that at low engine speeds the valve shuts so that the smaller amount of exhaust gets forced through the little opening and onto the turbine a whole lot faster. He likens it to holding your thumb over the garden hose to spin that paint roller you’re cleaning way faster than the open hose would.

Coleman describes the engine’s next trick with another paint metaphor. You know how compressed air is used to suck paint out of a reservoir when airbrushing that rainbow and unicorn onto your custom van? That same trick leverages the initial burst of high-velocity flow exiting a cylinder whose exhaust valve has just opened, to help suck the residual exhaust out of an adjacent intake runner serving the cylinder that fired immediately before it. It’s called the “ejector effect,” and a unique, ultra-short four-into-three-into-one “pulse converter” manifold makes it happen.

All of this helps boost efficiency and broaden the torque curve, but Mazda wanted to ensure the 2016 CX-9 would deliver on the fuel economy promised by the EPA’s gentle testing, something most downsized turbo engines have trouble doing. To do this, Mazda needed a better way of keeping the cylinders cool during hard use than spraying in extra fuel that can’t contribute to propulsion (most hard-working turbos do this). The answer? Route some exhaust up to an intercooler in front and pump this cooled EGR back into the intake. This greatly increases the load point where fuel enrichment is required for cooling. Mazda expects the 2016 CX-9 to earn 21-22/27-28 mpg city/highway.

Oh, and after spending all that money to add an EGR cooler that doesn’t help on the EPA cycle, why didn’t Mazda invest in engine stop-start tech? Not enough payoff. This 2.5-liter doesn’t burn enough fuel at idle, and because most Americans don’t idle their cars for very long, the tech doesn’t warrant the couple hundred dollar expense of doing auto stop-start right. Coleman’s list of what’s needed to do it right: an extra 12-volt battery and a fancy crankshaft-position sensor that knows precisely where the engine is, even when it’s not spinning. This allows the starter to get the crankshaft into precisely the ideal position so that a cylinder is ready to fire, assisting a faster, less noticeable restart.
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Mercury C557
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Discussion Starter #7
Re: what the heck is SkyActive?

Mazda faces fight to maintain mpg lead
AutomotiveNews

Sharon Silke Carty - July 18, 2016


Mazda may be leading the race toward the U.S. government’s more stringent fuel economy targets, but it’s about to hit a hard ceiling.

The Japanese automaker has no plans to fully electrify any of its models and is angling to sell more crossovers rather than the small models that now make up the bulk of its sales...


Mazda's Masahiro Moro during a roundtable with Automotive News.
“For 2021, we are very confident that we will meet the CAFE standards,”
he said. “2025 is another story.”
...This year, Mazda became the first non-electric vehicle maker to hit 100 percent compliance with the 2016 CAFE standards, which called for a fleet average of 34.1 mpg. Before that, Tesla was the only automaker to meet the regulations, but its fleet is all-electric. Mazda’s entire lineup in the U.S. is powered by gasoline engines and includes no hybrids.

Mazda credits its Skyactiv system, a bundle of platform technologies and engineering tweaks, for propelling it to the front of the fuel-economy pack. Skyactiv-tuned engines squeeze greater efficiency out of the standard internal combustion engine.

Moro said the second generation of Skyactiv, which should be unveiled in 2017, will be the main driver toward meeting 2021 standards. Skyactiv 2 will use homogenous-charge compression ignition combustion engines, a technology that mimics the compression in diesel engines, which should further improve efficiency in gasoline engines.

But HCCI engines are a “very difficult and delicate technology,” Moro said, so Mazda is working to ensure the engines are durable...

...Since it has had such success maximizing internal combustion engines, Mazda is under less pressure to pursue hybrids and electric cars, Moro said. The automaker has one hybrid, the Mazda3, for sale in Japan. That car uses Toyota hybrid technology, and Moro said Mazda has no plans to bring it to the U.S.

But he admitted Mazda will probably have to embrace some kind of electrification plan to reach the 2025 CAFE goal of 54.5 mpg. Those hybrid systems will likely be small, used primarily to enhance the efficiency of gasoline engines, he said...

...The bigger looming issue is the zero-emission vehicles mandate that is baked into the 2025 regulations, Moro said. Nine states have adopted California’s mandate that 15 percent of new-vehicle sales be zero-emission vehicles.

“To me, the biggest regulatory headache right now is ZEV,” he said.
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Re: what the heck is SkyActive?

...This year, Mazda became the first non-electric vehicle maker to hit 100 percent compliance with the 2016 CAFE standards, which called for a fleet average of 34.1 mpg

They forgot to mention that Mazda is also NOT a full line manufacturer. No high volume full size pick-ups, SUVs or commercial trucks and vans. If Mazda could not meet a 34.1 mpg average with sub-compact, compact and midsize sedans and CUVs, they would be in serious trouble.
 

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Re: what the heck is SkyActive?

This 2.5-liter doesn’t burn enough fuel at idle, and because most Americans don’t idle their cars for very long, the tech doesn’t warrant the couple hundred dollar expense of doing auto stop-start right.

That just sounds like an excuse for not funding research and development. Same with why Mazda has no plug-in or electric vehicle in 2016.

...don't idle their cars for very long??? On my short commute, I have three lights that if missed, are all about 3 to 5 minutes long. Just going and coming, if lights are missed both ways, that's over 20 minutes of idling on a 11 mile round trip per day.
 

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Mercury C557
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Discussion Starter #10
Re: what the heck is SkyActive?

süpertitle: we don't need no stinkin' sparkplugs
Spark-free SkyActiv: Mazda Seems Well Prepared for the Future, Without Electricity’s Help

TTAC

By Matt Posky on January 16, 2017


...Mazda’s SkyActiv technology is well suited for squeezing out an engine’s true potential, but it doesn’t feel particularly quirky or unique.
That could change with the company’s second generation of SkyActiv engines. Mazda is one of only two automakers planning to introduce a motor with homogenous charge compression ignition (HCCI) sometime next year. If you’re unfamiliar, that’s a direct-injection gasoline-powered motor that uses compression, not spark, to ignite fuel — something typically reserved for diesel powerplants.

Mazda expects the HCCI engine to yield a 30 percent improvement in fuel economy...

...According to the Nikkei Asian Review, the second generation SkyActiv engines should give the Mazda3
{mce in 2018} fuel economy “approaching 30 km per liter.” While only a rough estimate, that equates to over 70 miles to the gallon — enough to put hyper-mile hybrids to shame and meet stringent CAFE standards...
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Mercury C557
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Discussion Starter #11
Re: we don't need no stinkin' sparkplugs

saw a post by a rocket scientist elsewhere about HCCI
that sounded like it'd mainly be for hyper-mpg on the highway
it also speculated about being turbo'ed for when Not in HCCI
imho
if HCCI needs help with city driving and accelerating, combining with hybrid-electric could be more likely
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Re: what the heck is SkyActive?

I wonder how many of these advanced technologies are more about achieving "wonderful" numbers that can't be fully
replicated in real world driving. The Mazdas with SkyActiv try hard but their compression is limited in Nth America
so their full worth is not realized. Also, if mazda doesn't advance beyond a fast lock up 6-speed auto, they'll get passed.
 

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Mercury C557
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Discussion Starter #13
Re: we don't need no stinkin' SkyActive! (whatev it was)

Mazda's new engine boosts fuel efficiency by 30%
Nikkei
- January 9, 2017 2:00 am JST

Automaker plans to offer cars with the new technology next year

TOKYO -- Japanese automaker Mazda Motor will introduce a new engine at the end of 2018 that offers 30% better fuel efficiency by using pressure, not spark plugs, to ignite fuel.

This will be the first practical application of the technology, called homogeneous charge compression ignition ( HCCI ). Though the automaker is developing environmentally friendly electric vehicles, Mazda thinks the internal combustion engine will continue to account for the majority of new-vehicle sales for the foreseeable future and that the company's technology will give it a leg up on the competition.

Mazda plans to incorporate the new engine in 2018 in the new Mazda3, dubbed Axela in Japan, which will undergo its first overhaul in five years. The engine then will be adopted gradually by other models. The automaker positions the engine as the second generation of its Skyactiv suite of environmentally friendly technologies, which were introduced in 2011.

The new engine ignites the mix of fuel and air by subjecting them to pressure, making combustion more efficient than conventional engines using spark plugs. This method also reduces exhaust emissions.

Varied configurations among models make simple comparisons difficult, but the new engine would give the current Mazda3 mileage approaching 30km per liter, according to estimates. ( just over 70MPG )

Mazda will start mass-producing electric vehicles by 2019 and plans to have a plug-in hybrid as of 2021. The automaker is targeting the U.S. and European markets, where environmental regulations are becoming stronger, but the company plans to incorporate the engine in autos built for the global market, including developing nations, by at least 2030.
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Discussion Starter #15
Re: what the heck is SkyActive? (HCCI update)

Mazda could have the tech to save the internal combustion engine
Compression ignition boosts efficiency up to 30 percent...claimed

TheVerge.com
- Zac Estrada - Aug 8, 2017


...Mazda announced on Tuesday that it would introduce a gasoline engine that doesn’t always need spark plugs to ignite the fuel and air mixture and promises greater efficiency along the lines of a diesel engine. Instead, it finds the most efficient way to operate depending on driver demands, various settings in the car, and external conditions. Spark Controlled Compression Ignition**, as Mazda calls its proprietary system, works because it behaves more like a traditional gasoline engine despite the diesel-like technology and having a supercharger to boost power, the company said...
( ** guess it could be pronounced "SKY" :angel )

...The setup is basically what’s known as homogenous charge compression ignition, and it’s based off of lots of existing technology that other companies have long looked into. Ford and General Motors are just two companies that have been experimenting with it in the last decade or so, but haven’t been able to put it into production yet.

Mazda released few other details about the engine other than it would be released in 2019, likely in the new Mazda 3. It’s expected the compression ignition engines will replace most, if not all, of the company’s internal combustion engines around the start of the next decade...
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Re: what the heck is SkyActive? (HCCI update)

Ford, PSA Developing HCCI Diesel
Oct 11, 2006 William Diem | WardsAuto
PARIS – Ford Motor Co. engineers in Europe are developing a V-6 diesel aimed at meeting rigid nitrogen oxide emissions rules in Europe and North America without expensive exhaust aftertreatment.
http://wardsauto.com/news-analysis/ford-psa-developing-hcci-diesel

The experimental diesel, based on the 2.7L V-6 engine Ford manufactures with PSA Peugeot Citroen in Dagenham, U.K., uses a combination of Homogeneous Charge Combustion Ignition (HCCI) cold combustion as well as ordinary diesel combustion.

But its real innovation is a new strategy for controlling combustion. Instead of adjusting the oxygen intake to match the demand for fuel, Ford has developed an engine controller that adapts the fuel injection to the oxygen available.

Changing the amount of air that reaches the combustion chamber is a slower process than altering the amount and timing of the fuel injection, says Christian Vigild, engineer at Ford’s diesel powertrain research center in Aachen, Germany.

Vigild presented research on the diesel engine, which is being developed by Ford and PSA under their Gemini project, at a 2-day academic conference here.

More than 100 international engineers and scientists attended presentations on how to better design electronic controls, mainly for HCCI engines and hybrids.

HCCI is a system that works at lower temperatures – 3,452° F (1,900° C) – than either gasoline or diesel combustion. Lower temperatures mean less NOx emissions.

By “putting the rabbit on the back of the turtle,” Vigild says low-temperature combustion is more complete even when accelerating in the HCCI mode.

One approach to getting better combustion is to measure the pressure inside an engine cylinder so the engine control unit knows what is happening. However, such sensors are expensive.

Vigild says Gemini's approach of adjusting the fuel injection to match the oxygen available provides better control during transitions.

“We tried to keep it simple from the start,” he says. “We wanted a design that did not require a pressure sensor in each cylinder.”

Without giving numbers, Vigild indicates the experimental engine had "very low" NOx output in a midsize car such as the Ford Mondeo.

But the project is unlikely to see production before 2012, when Euro VI rules are expected to be in place.

And if a cheaper system of aftertreatment for diesel NOx production is invented, it could prove to be a better economic alternative, Ford engineer Charles Tumelaire concedes.
 

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Re: what the heck is SkyActive? (HCCI update)

Now with diesel being banned in many European cities, my guess is that the HCCI diesel plan has been canned.
 

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Mercury C557
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Discussion Starter #18
Re: what the heck is SkyActive? (HCCI update)

^ :thumb: I was thinking earlier today
"too bad Yurpland already decided on legislation outlawing diesels...
...and even petrol"

WardsAuto said:
...The experimental diesel, based on the 2.7L V-6 engine Ford manufactures with PSA Peugeot Citroen in Dagenham, U.K., uses a combination of Homogeneous Charge Combustion Ignition (HCCI) cold combustion as well as ordinary diesel combustion...

...Without giving numbers, Vigild indicates the experimental engine had "very low" NOx output in a midsize car such as the Ford Mondeo...
unless it's an extremely SHRUNK variant of the 2.7
this HCCI process must really kill the power
cuz
there's No Way they'd put a 2.7 DIESEL in a Mondeo ... except for a superHPO

...afaik :angel
 

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Re: what the heck is SkyActive? (HCCI update)

This certainly has Ford’s attention, who has been working toward HCCI for decades now. Very curious what it will look like, and their claims are 20-30% btw. But again, that’s all relative. A 20% gain, for example, relative to their NA engine is of course impressive, but a bit less so relative to a GTDI engine, that is already seeing it’s own substantial gains over NA.

Like Trump likes to say, we shall see what we see.
 
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