The World's First CVVD Engine - Genius!

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Hyundai's brilliant engine technology continuously varies valve duration!

The world’s first production CVVD engine! CVVD stands for continuously variable valve duration. This technology is currently used in the 1.6L turbo engine of the 2020 Hyundai Sonata. In order to understand it we need to understand how valves work on an engine. Of course, you have the four engine strokes: intake, compression, power, and exhaust. Intake you have the intake valve open, obviously, and your exhaust stroke has the exhaust valve open. On the most basic of engines, everything about how these valves operate is fixed, because those valves follow the cam profile of a fixed camshaft.

On modern car engines, there are variables we can change; three of them, as it relates to valves. First, there’s variable valve lift. This means you can change how far down the valve travels allowing for more or less airflow into the engine. Second, you have variable valve timing, this means you can change when you actually open this valve, you can open it sooner, or open it later, relative to its standard timing. And third, and this is what Hyundai is adding into the mix, is variable valve duration. This is controlling how long you actually leave the valve open. You could have it open and close very quickly, you could have it remain open for a longer duration, or anything between.

Up until this point, no mass produced engines have actually been able to vary how long a valve remains open, relative to the engine speed. If you’re wondering about Koenigsegg’s freevalve, and we’ll discuss that in the video as well. So, how does Hyundai do it? Check it out!

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*UPDATE!* There was another engine which had variable valve duration (Rover, 1995). I asked Hyundai about this, and from one of their presentations: "Such method, which allows change in valve actuation by altering the rotational speed of cam, is thought to be devised by Mitchell [2, 3]. The Rover first launched the engine to the market in 1995 [4]. The Rover’s VVC (Variable Valve Control) system was applied to 1.8L inline 4-cylinder engine in order to change the intake valve’s timing and duration. VVC system requires four camshafts to drive the intake valve; two of the camshafts are driven by timing belt at the front of the engine, while the other two is driven at the rear of the engine by the exhaust camshaft. Because of such feature, VVC system cannot be used with CVVT simultaneously, impeding the independent control of the valve opening and closing timing."
So in this case, the "world first" is the fact that it is the first production engine to combine CVVT with CVVD, as the Rover mechanism did not allow for variable timing. Thanks for commenting about the Rover engine - fascinating to learn about!

EngineeringExplained

As a Hyundai technician, I can say that by far this has been the best explanation of how this system works, even surpassing that of the manufacturer training module. Kudos to you sir

ponyboy

My old Hyundai actually had CVVD: Continuously Variable Valve Destruction. Of course, this was because the timing belt broke, but still...pretty impressive.

richdelgado

This reminds me of how clarkson described the turbo: "exhausts gases go in, witchcraft happens, and you go faster."

joshlong

This is a pretty ingenious bit of mechanical engineering. Alright, Hyundai, I'm impressed.

rylian

I am not an auto mechanic but I do understand the basics. This presentation is so well done that I picked up the concept and theory-of-operation on my first run through the video. I didn't have to pause/rewind/re-view any portion of it. Cu-do's to Jason for such a well done presentation!

curtiskemmerle

Who's here after James May called Jason "a clever bloke." Congrats mate, you deserved to be praised by one of the world's best!

mog

It's actually amazing, not the variable duration. But the fact that the heat treating processes for these parts has finally been dialed in to such accuracy and repeatability that they are able to mass produce.

auto

That’s really a genius design. I can imagine the pride those engineers feel knowing they’ve created something so complex yet entirely mechanical.

FOXTRT

Can i just take a minute to appreciate how well this has been described in perfect detail 👌

leighgray

it's so beautiful to see a Mechanical advance in 2020, nowadays everything is digital and electronic

carlitoxb

Thank you for a well-rehearsed lecture. That confident, enthusiastic, non-redundant explanation ensures that comprehension lag coincides nicely with attention-span interruption: the brain shifts from listening to understanding, hits eureka, then enthusiastically shifts to listening again. That actually parallels the intake/exhaust valve cycles.
I have heard lectures where a person spoke without rehearsal, and either his technical knowledge outpaced the comprehension delay of the audience, or his tedium got outstripped by attention span. You have most excellently explained in such a way that an engineer would not get bored, and a non engineer would not be overwhelmed.

mightymystery