Spend any time within the automotive fanatic nook of the web, and you will shortly study that nothing might presumably be worse than a constantly variable transmission. They’re all horrible, any automaker that places them in its automobiles is a big, dumb fool, and solely a moron would really purchase a kind of automobiles. But when it is so apparent that CVTs are actually the worst, why do automakers proceed to make use of them? Do they only hate their prospects or one thing?
Effectively, in the event you ask Jason Fenske from Engineering Defined, the reason being that CVTs aren’t really unhealthy, and in actuality, they’re fairly nice. No less than if we’re speaking in regards to the fashionable eCVTs that so many automakers have moved to. Had been the early CVTs that we noticed in automobiles, particularly in Nissans within the early 2000s, unreliable and bizarre to drive? Certain. However the eCVTs you see at this time do not use the belts and pulleys that earned Nissan’s early CVTs their horrible reputations.
As a substitute, these new transmissions use a single planetary gearset paired with two electrical motors, fully eliminating the necessity for belts and pulleys. So, whereas an previous CVT and a brand new eCVT share the truth that they’re each constantly variable, the methods they make that occur are about as totally different as may be. The analogy is not good, however in some methods, it is rather a lot like projecting your complaints about previous four-speed automatics onto a contemporary dual-clutch transmission. In spite of everything, neither one requires you to function a clutch pedal to shift, proper?
Let an engineer clarify
Sadly, our favourite engineer (go Pack!) would not get away the whiteboard for this explicit video, which is a disgrace. Who would not love studying from a superb, old style whiteboard? However I assume we are able to all most likely forgive Jason for that one, since he as an alternative borrowed an eCVT coach unit so you possibly can really see how a contemporary eCVT works in motion, as an alternative of getting to think about it your self primarily based on some whiteboard drawings.
Apparently, the corporate that despatched it is not a sponsor and simply needed to do its half to silence the haters educate the plenty. Because of the demonstration unit, it is really fairly simple to wrap your thoughts round how an eCVT really works, which actually is fairly cool. Perhaps a whiteboard actually is not the reply to all the pieces.
That mentioned, the much-hated “rubberband” impact you skilled in Nissan’s early CVTs is not essentially the results of its selection to make use of belts and pulleys. As a substitute, that is as a result of there is no direct hyperlink between engine RPM and wheelspeed. Making a automotive outfitted with an eCVT really feel extra pure to drive then turns into a matter of tuning greater than a problem inherent to constantly variable transmissions.
Did Nissan’s unreliable transmissions have loads of issues that damage the CVT’s fame? Certain. Are you going to mechanically love each single new automotive with an eCVT? Most likely not. But it surely’s nonetheless essential to recollect we’re coping with fully totally different expertise right here, and no matter points you had with that previous Murano most likely aren’t related once we’re discussing fashionable automobiles with fashionable eCVTs.
