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Mazda’s hotly advancing SKYACTIV-X Atom Controlled Compression Agitation agent has been declared as the “Holy Grail” of gasoline motors—something with diesel-like ammunition economy, but far bigger efficiency. I went to Germany to allocution to Mazda’s acutely banal engineers, and afore I absolutely collection the thing, here’s what I learned.

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(Full Disclosure: Mazda capital me to drive their SKYACTIV-X prototype, so the aggregation flew me to Frankfurt, Germany, put a nice roof over my head, and fed me adorable foods whose names had added umlauts and Scharfes S’s than I could count.)

Mazda brought authoritative officers, VPs and managers from its powertrain, agent development, and analysis and development teams to explain to journalists how the SKYACTIV-X Atom Controlled Compression Agitation agent works, and why it matters.

In addition, Mazda discussed its all-new platform, which is area we’ll alpha afore jumping into the agitative SPCCI agent goodness.

Despite accepting apprenticed some ancestor next-generation Mazda3s at the accident in Frankfurt, I can’t absolutely say abundant about its advance over the approachable bones. But the capital credibility authoritative administrator of agent development Hiroyuki Matsumoto fatigued aback talking about the new anatomy dealt with refinement.

Matsumoto said that, in its accomplishment to advance a active activity they alarm Jinba Ittai (“Connection amid horse and rider”), the aggregation advised the animal amble to authorize a “platform that optimizes animal adeptness to balance.”

Part of that complex designing the bench supports to “maintain accustomed S-curve of the analgesic cavalcade by the adjustment of the driver’s pelvis” (you can see that below). Mazda additionally advised a new bench anatomy that’s allegedly able to bound and “smoothly address the activity ascribe from agent anatomy to the driver’s pelvis.”

On top of that, Matsumoto told journalists that the anatomy has been stiffened to abate the brief acknowledgment time amid the ascribe bulk on one damper, and the acknowledgment bulk at the damper in the adverse corner. Mazda does this by application what it calls “ring structures” (shown in the dotted blooming circles below):

The architect additionally mentioned abeyance and annoy changes aimed at calmly authoritative activity alteration from the caster to the body, as able-bodied as NVH changes like the 16 locations outfitted with damping adhesive (the two baby squares apparent below), which is meant to allay exceptionable vibrations.

Ultimately, Mazda’s capital credibility aback discussing the new belvedere seemed to circumduct about disciplinarian comfort, with accent on ride quality, noise, and the way the car communicates inputs to the driver’s ass.

Unfortunately, I didn’t absorb abundant time in the ancestor to absolutely appraise how abundant bigger this belvedere is than the last. We’ll accept to adjournment for a abiding analysis for that.

To accept the accomplished point abaft Mazda’s new gasoline compression agent tech, let’s attending at the seven factors the aggregation works on to access centralized agitation agent adeptness (shown on the larboard of the clear below).

They are: compression ratio, specific calefaction ratio, agitation period, agitation timing, calefaction alteration to the wall, cogwheel burden amid assimilation and exhaust, and automated friction.

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Improving these attributes apparently leads appear the “ideal” centralized agitation engine, and SKYACTIV-X takes a cardinal of accomplish in the appropriate direction.

Higher Compression Arrangement And Specific Calefaction Ratio

Mazda mentions in its presentation that agitation agent adeptness is accompanying to compression arrangement and the assimilation charge’s specific calefaction arrangement via the blueprint above. In added words, cranking up compression arrangement and specific calefaction ratios yields bigger efficiency.

SKYACTIV-G, Mazda’s accepted bearing of gasoline agent technology, acclimated a able bankrupt system, a agent cavity, and a high-pressure ammunition arrangement with multi-hole injectors to anticipate animadversion and to acquiesce for a ridiculously aerial 14:1 compression ratio. SKYACTIV-X, a compression agitation engine, cranks that bulk up to amid 15:1 and 16:1.

As for bumping up that specific calefaction arrangement (“k”) value, Mazda says active the agent angular and abbreviating its agitation temperature takes affliction of that. We apperceive that k for air is about 1.4, and k for ammunition breath tends to be 1.33 or less. That agency the added air you can put into that air:fuel charge, the college that all-embracing k value, and appropriately the greater the efficiency.

Decreased agitation temperatures are a aftereffect of angular bake (and indeed, why NOx emissions are so low for this blazon of engine). The benefit, Mazda shows in the artifice above, is that the lower agitation temperatures beggarly beneath activity is absent “to atomic accordance and decomposition.” Thus, a lower agitation temperature yields a college k, which—again—means bigger efficiency.

Combustion Aeon And Timing

Aside from the college compression arrangement and specific calefaction arrangement it allows, compression agitation engines tend to bake their angular mixtures thoroughly and rapidly. This agency activity from agitation can be added calmly translated into assignment done on the piston, admitting atom agitation engines tend to absorb a cogent time adjournment associated with blaze propagation.

Pumping Losses And Calefaction Loss Through Cylinders

The added two areas area a angular compression agent can crop cogent adeptness allowances is in cooling losses and throttling losses. The aboriginal is adequately straightforward, as lower agitation temperatures beggarly beneath calefaction transferred to the butt walls.

The additional has to do with the actuality that a bacteria air/fuel admixture agency there’s added air appropriate for a accustomed torque level. This—along with cardinal use of EGR, capricious valve timing and a supercharger to ascendancy airflow into the cylinder— agency the burke bowl can be captivated absolutely accessible added generally than on a accepted gasoline engine.

So instead of aggravating to blot air through a akin burke plate, air can breeze calmly into the cylinders. Mazda says this additionally has the added account of bigger burke response, aback there’s no best a adjournment in aggravating to ample the assimilation plenum.

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Mazda’s new technology additionally promises bargain emissions, which is a big deal, aback Dieselgate is putting a huge damper on compression engines. With centralized agitation engines, oxides of nitrogen tend to dispatch with a college air:fuel arrangement up to a point.

Above that point, NOx achievement drops (as you can see from this plot). Aback Mazda’s new agent usually runs at a lambda (fuel:air arrangement about to stoichiometric) of at atomic 1.5, its NOx achievement is rather low, and can accordingly abandon big-ticket emissions equipment. Carbon emissions, too, are bargain with SPCCI due to its college ammunition efficiency.

A gasoline compression agitation agent isn’t absolutely a new concept. In fact, if you go aback an absolute decade, you’ll see that General Motors alike had ancestor Constant Allegation Compression Agitation engines (with atom assist) accessible for journalists to drive about the analysis track. Why, then, is anybody accepting aflame about Mazda’s gasoline compression agent aback we’ve been audition about agnate technologies for years?

The acknowledgment comes bottomward to how Mazda’s authoritative combustion. The two capital issues that Mazda says accept impeded the admeasurement of gasoline compression engines are: 1. The bound area in which compression agitation is accessible and 2. The asperous alteration amid compression and atom ignition.

What Mazda has done to break these problems is devise a arrangement alleged Atom Controlled Compression Ignition, SPCCI, a action in which a atom bung creates a “fire ball,” which acts to abbreviate the constant admixture of air/inert EGR gases and ammunition to abet compression ignition.

Here’s addition attending from the top of the butt look:

The atom bung itself isn’t able to actualize this aggressive with a angular mixture. So what Mazda has done is positioned a ammunition injector abutting to the plug. That high-pressure injector initially shoots baby amounts of ammunition into the butt during the assimilation stroke.

That ammunition mixes with a cyclone of air from the assimilation (which is fed from a supercharger and cooled EGR—both of which can be absolutely controlled) to actualize a constant angular admixture about the periphery.

During the compression stroke, a assertive bulk of ammunition is injected into the “eye” of the angular amphitheater (an bulk based on agent load), and atom is absolutely timed to ablaze the affluent fireball, which again ignites the angular admixture about it—and voila! you accept compression ignition. (Note that this backward bang of ammunition during the compression achievement is Mazda’s way of preventing preignition; to accomplish this requires a high-pressure bang system.)


The admirable affair about SPCCI is that, because it relies on a atom to activate compression ignition—unlike constant allegation compression agitation engines we’ve apparent from added automakers, which await alone on automated compression—combustion can be adequately able-bodied controlled. Application a cardinal of sensors including in-cylinder burden sensors and assimilation temperature sensors, Mazda’s new agent can adviser anon or alongside things like assimilation temperature, butt pressures, humidity, coolant temperature, oil temperature, air:fuel ratio, and EGR percentage.

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The computer receives inputs from a cardinal of sensors every cycle, and uses them to accomplish absolute adjustments to things like bang timing, atom timing, valve timing (which can, for example, authority an bankrupt valve accessible during the assimilation achievement to act as “internal EGR” to balmy the agitation alcove during algid starts), cooled EGR achievement (which can absolutely air-conditioned the agitation alcove with its apathetic gas, and acclimatize the gas:fuel ratio), supercharger dispatch (the supercharger has an basic clutch), and alike Belt Starter Generator torque (a baby motor that could be acclimated to advice bland out the engine’s operation, abnormally in brief active conditions).

An archetype of how Mazda uses inputs to ascendancy agitation is apparent above. At the top left, you’ll see the ambition heat-release curves as a action of crankshaft angle.

Mazda uses inputs from in-cylinder burden sensors and assimilation air temperature sensors to accomplish adjustments to atom timing, advancing agitation of that aggressive (virtual piston) to accomplish compression agitation absolutely at the appropriate moment behindhand of assimilation air temperature to aerate the assignment done to advance bottomward the piston.

More Power and Torque, Bigger And Added Constant Ammunition Economy

Mazda’s ambition aiguille achievement abstracts for the new agent are 170 lb-ft or torque and 187 horsepower, both of which are college than today’s gasoline SKYACTIV-G agent of the aforementioned displacement. Mazda says its antecedence aloft aiguille abstracts is “a advanced and advantageous ambit of torque…to ensure the best accessible drivability.”

That drivability is aided by a adulate ammunition burning ambit that Mazda says allows the car to absorb a numerically college final drive ratio—which yields college agent speeds and appropriately bigger acknowledgment times—without annoying about above ammunition abridgement detriments.

The bargain acuteness of SKYACTIV-X’s ammunition ecoomy to RPM/load tradeoffs not alone promises bigger dispatch performance, but additionally bigger real-world ammunition abridgement figures.

As Mazda credibility out in the plots below, ammunition abridgement drive cycles conducted by agencies about the apple leave out a cogent cardinal of agent operating points. By accepting a collapsed ammunition adeptness curve, Mazda says its new agent is added acceptable to accomplish the ammunition abridgement apparent on the label.

The SKYACTIV-X agent represents Mazda’s “Quest to accomplish the best centralized agitation agent in the world.” Achieving that ambition is arguably impossible, but whether Mazda can appear abutting depends on how able-bodied its engineers able to banknote in on the promised allowances of the technology.

If this agent can absolutely accommodate over their accepted gas agent 20 percent bigger ammunition economy, a adulate and taller torque curve, added constant real-world ammunition economy, low emissions, and bigger agent response, all at a almost reasonable amount (since, afterwards all, the sensors and actuators are all absolute technologies), they’ll accept a above success on their hands.

I, for one, achievement they cull it off.

More SPCCI porn:

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