Name: 英菲尼迪驚人的新發動機--可變壓縮和渦輪增壓。 (Infiniti's Amazing New Engine - Variable Compression & Turbocharged)
Uploaded: 2021-01-14T07:03:35.000Z
Duration: 6 min 27 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

In this video we're going to be talking about

but that's besides the point and not my decision to make.

So the reason why this engine has gotten so much media hype lately

So traditionally you can have an engine that's really

or you can have an engine that's very efficient but it won't be very powerful.

is allow you to choose between both of those options

You're not going to have both at the same time

or you can choose to run it with a lot of power

depending on where that foot is on that gas pedal.

by incorporating this variable compression ratio.

or it can be as high as 14:1 for a very efficiency operating condition

which it kind of is but we're going to break this down,

simply so that we can understand what's going on.

which is just going to be like a normal engine

which is going to be used to adjust the compression ratio.

So for now, let's just ignore everything below this

and look at what we've got going on up top.

So here we have our piston, the connecting rod, the cylinder, everything like usual.

so you can see there's this rectangular piece called the multilink.

and that's going to be linking up these two sections.

And so your crankshaft, is going to be right here,

So, to give you an understanding of what this looks like

and then the center, this axis which it rotates about

is of course right there, so looking at this

this crankshaft right here how this will be oriented

with the center right here and this will rotate around

This piston will come down and up and down and up

And now important thing you need to understand  is that this multi link right here this rectangular piece

maintains this orientation as it goes
around the crankshaft it doesn't rotate

it maintains that orientation and so
that's what we're gonna be using

to change the compression ratio
is changing the angle of this

rectangular piece right here so you can
see if you were to tilt it up that would

cause this piston to move up increasing
the compression ratio and if you were to

tilt it down that would decrease the
compression ratio pulling the piston

down so what we're looking at right here
is top dead center the crankshaft

oriented like that so you've got the top
of it right here and then the center of

it right there and it's about to rotate
down like that. So how this works on the

compression ratio adjustment system
basically all you need to know about

this side of the system the most
important piece is that what you're

trying to do is to move this lower link
up and down because as you move this

lower link up and down you change the
orientation of this rectangular piece

this multi link and so if you were to
pull it down you can see it increase the

compression ratio because it pivots
about this point pushes the piston up

and if you were to push it up you would
pull the piston down decreasing the

compression ratio at top dead center
Okay great so how does it do this?

Well, the magic of it really comes down to
this central shaft right here but

basically we have a harmonic drive right
here you can just think of this as a

device which rotates clockwise or
counterclockwise and then you have this

actuator arm which rotates this central
shaft. So the central shaft rotates about

this pivot point right here so you can
see if this central shaft were to rotate

downward if it were to rotate down that
direction it's going to pull this lower

link down and by pulling that lower link
down it's pushing the piston up

increasing the compression ratio. I f it
were to rotate upward if this piece were

to rotate up like that it's going to
push up on here and then that's going to

pull this down and that's going to
decrease your compression ratio so it's

all dependent on which way you turn this
actuator arm it's linked up and it's

going to cause this to pivot about this
point right here so you can see

currently this is the state it's in if
you were to rotate it using this linkage

you could rotate it down and you would
increase your compression ratio to 14:1

or you could turn it all the way up
and that would push this up pivot this

down and that would decrease your
compression ratio down to 8:1 so you

know once you kind of see all of this
work together it's really not that

complicated but it is kind of a mess
looking at all of it together

and so the important thing to
just kind of see is that it can rotate

this rectangular piece rotates around
the crankshaft about this point right

here and then these two pieces right
here these two links keep this

rectangular piece in that orientation as
it goes around and you can change that

by changing the height of this lower
link using that central shaft great

that's all clear right? And so you know
why do you want to do this? Well as I

mentioned you kind of remove that
compromise so you can use a low

compression ratio you can put in tons of
boost and so why do you need a low

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英菲尼迪驚人的新發動機--可變壓縮和渦輪增壓。 (Infiniti's Amazing New Engine - Variable Compression & Turbocharged)

compromise

eliminate

basically

improve