Mazda is a a lot smaller firm globally than fellow Japanese manufacturers Toyota, Nissan and Honda nevertheless it has a storied historical past, being initially based as a cork manufacturing unit in 1920 earlier than switching to automobile manufacturing in 1931.
Arguably extra so than its Japanese counterparts, Mazda is unafraid of taking dangers. A few of these, akin to the event of the MX-5, have paid off.
Others, such because the continuous funding in rotary engines, have been much less profitable, regardless of producing some iconic automobiles. Some have even introduced the corporate near chapter, akin to its over-investment within the Amati and Eunos luxurious marques in the course of the top of the Japanese financial growth within the 80s and early 90s.
Mazda’s most up-to-date long-term gamble has been the event of a brand new strategy to creating extra environment friendly automobiles with out compromising on efficiency, or the lauded ‘Zoom-Zoom’ and ‘jinba-ittai’ (unity of rider with horse) driving feeling that Mazda claims its automobiles are famend for.
This strategy is called SkyActiv, and represents a collection of applied sciences starting from engines to transmissions and chassis applied sciences.
Transient historical past
Components of Mazda’s SkyActiv philosophy have been in manufacturing for greater than a decade, and the primary automotive to be bought in Australia beneath the SkyActiv banner was the BL Sequence 2 (mid-life facelift) Mazda 3 hatch and sedan launched in late 2011.
These fashions had been outfitted with SkyActiv engines and transmissions solely, and whereas the ability and torque will increase of the two.0-litre SkyActiv-G engine had been modest in comparison with the previous MZR 2.0-litre engine, the automobiles did have a considerable 25.6 per cent enchancment in gas consumption.
At this time, your entire Mazda passenger automotive and SUV vary makes use of the total gamut of SkyActiv applied sciences. The one exception is Mazda’s BT-50 ute, based mostly on the Isuzu D-Max. Nonetheless, Mazda claims that, as the most recent BT-50 options considerably extra economical engines than its predecessor, it aligns with the general SkyActiv philosophy.
It’s essential to notice that whereas Mazdas on sale immediately share SkyActiv branding with fashions bought a decade in the past, this doesn’t imply that Mazda has been standing nonetheless, with Mazda repeatedly enhancing and refining SkyActiv know-how.
SkyActiv engines
Mazda’s SkyActiv engine household can greatest be considered a sequence of engineering rules and shared design parts, that span all kinds of naturally aspirated, turbocharged (each petrol and diesel) and hybrid powertrains.
These embrace comparatively excessive compression ratios for petrol engines, and relatively low compression ratios for diesel engines.
Mazda claims that for petrol engines, a excessive compression ratio improves thermal effectivity, resulting in larger gas economic system, while additionally enhancing low and mid-range torque for higher on a regular basis drivability.
Mazda’s naturally-aspirated petrol SkyActiv engines due to this fact typically use excessive compression ratios starting from 13.0:1 to fifteen.0:1 within the modern SkyActiv-X powertrain, whereas even turbocharged petrol SkyActiv engines undertake a ten.5:1 compression ratio, excessive in comparison with comparable powerplants.
One of many dangers with utilizing high-compression ratios is an elevated threat of engine knock, whereby the air-fuel combination combusts prematurely, and might trigger critical injury to the engine.
One frequent resolution to that is limiting the engine to solely settle for high-octane gas (akin to 98 RON), nevertheless, Mazda has designed a extra everlasting various by adopting a ‘4-2-1’ exhaust system. This bodily will increase the size of the exhaust manifold, and lowers the possibilities of sizzling residual fuel being pressured again into the combustion chamber and inducing engine knock.
For diesel engines, a low 14.0:1 compression ratio is used, which Mazda claims permits its engines to satisfy stringent Euro 6 emissions laws (particularly regarding nitrous oxide or NOx emissions) with out the necessity for AdBlue or different exhaust fuel remedies.
Just lately, SkyActiv know-how has moved into the mild-hybrid house, with the e-SkyActiv G engine making use of a 24V mild-hybrid system to enhance gas economic system.
Maybe essentially the most notable innovation within the SkyActiv engine lineup, nevertheless, has been the introduction of the SkyActiv-X engine. Mazda claims that this engine combines the very best facets of petrol and diesel engines by way of a course of generally known as Spark Managed Compression Ignition (SPCCI).
SPCCI combines the very best parts of spark ignition, as utilized in petrol engines, with compression ignition, as utilized in diesel engines.
An preliminary spark is used to generate a fireball to start the combustion course of, much like a petroleum engine. Nonetheless, the precise combustion of the air-fuel combination happens quickly and constantly, much like compression ignition, fairly than the gradual combustion of a typical petrol engine.
Mazda claims that this know-how permits it to ship 30 per cent extra torque than a normal SkyActiv G 2.0-litre engine, whereas additionally besting the SkyActiv D diesel in gas economic system.
Actual-world testing of the Mazda 3 with this powertrain has proven its mixed economic system to be barely higher than that of the extra highly effective 2.5-litre engine, if not as frugal as, for instance, a Toyota Corolla hybrid. It’s additionally provided within the associated CX-30.
SkyActiv transmissions
Mazda has additionally utilized SkyActiv rules to the transmissions it makes use of, together with each handbook and automated transmissions.
Handbook transmissions have had greater than a century of refinement, but the handbook transmission in Mazda’s MX-5 is extensively lauded as the most effective obtainable within the business no matter worth.
With its new SkyActiv-MT, Mazda aimed to copy the shift really feel of the MX-5 throughout manuals used all through its lineup, facilitating a discount in transmission weight of 16 per cent, by way of developments such because the elimination of the reverse idle shaft.
Computerized transmissions have lengthy overtaken manuals in recognition in markets akin to Australia and the US, and maybe the extra spectacular growth is Mazda’s SkyActiv-Drive automated transmission, which it claims combines the very best parts of normal torque converter, CVT and dual-clutch transmissions utilized in different automobiles.
Virtually, SkyActiv-Drive works as a traditional automated transmission. Usually, these transmissions characteristic a lock-up clutch that matches transmission pace to engine pace, however solely function 50 per cent of the time to keep up low ranges of noise, vibration and harshness (NVH).
With its SkyActiv-Drive transmission, Mazda makes use of a lock-up clutch that may function 80 per cent of the time and, with the addition of a vibration damper, doesn’t trigger any loss in refinement.
Mazda claims this allows its transmission to have the graceful takeoff and creeping of a conventional automated, with among the responsiveness and direct driving really feel of a dual-clutch, and not one of the slippage or droning noises generally skilled in CVT transmissions.
SkyActiv physique and chassis
Physique and chassis constructions are key contributors to the load and security of a automobile, and Mazda claims it has made important enhancements beneath its SkyActive philosophy.
The general strategy right here was to coordinate the varied disparate constructions which might be mixed to kind a monocoque, with a concentrate on load switch and rigidity. This meant that, the place potential, beforehand curved facets of the monocoque would get replaced with a extra inflexible, straight half, whereas extra superior welding and bonding methods could be used to create a repeatedly bonded framework.
These developments allowed Mazda to enhance security by making a extra refined multi-path load construction such that within the occasion of a collision, forces are distributed in a number of instructions fairly than by way of a single a part of the physique.
Supplies-wise, Mazda claims that automobiles with a SkyActiv physique additionally incorporate a larger proportion of high-tensile metal, bringing advantages to each physique energy and weight.
Whereas suspension and steering methods can fluctuate based mostly on mannequin (e.g. the Mazda 3 makes use of a less expensive torsion-beam rear suspension, fairly than an unbiased setup just like the Mazda 6 and CX-5), Mazda claims it has revised its strategy to suspension growth, and has additionally launched a brand new electrical energy steering system that provides higher high-speed stability and low pace agility.
Different automobile dynamics
Alongside enhancements to the bodily physique and chassis, Mazda has additionally launched extra superior digital automobile dynamics applied sciences, that intention to enhance cornering at pace. Referred to as G-Vectoring Management and G-Vectoring Management Plus (GVC and GVC Plus), these can successfully be considered Mazda’s tackle torque vectoring.
The unique GVC minutely modulated engine torque output based mostly on the driving force’s steering and acceleration inputs, aiming to handle the forces that act on the automobile and supply refined enhancements to automobile turn-in.
The most recent system, GVC Plus, extra carefully mimics the brake-based torque vectoring methods utilized by different carmakers, in including momentary braking, in an try to enhance automobile stability and improve dealing with.