No manual tranny??

[PriusSport]

Originally Posted by john1701a

Other than the name, absolutely nothing is in common. The components are different and they operate different.

Cone & Belt type CVTs are used for non-hybrid vehicles and some "assist" hybrids.

Planetary type CVTs are used for "full" hybrid vehicles.

Refer to the PSD documents on my website for illustrations & descriptions of how the system in Prius works.

.

Thanks. Does the Prius CVT feel smoother than the others? I assume it isn't either Cone & Belt or Planetary.

[patsparks]

I'm not sure what you mean by tranny, this is a tranny


The Prius has something looks more like this

under the bonnet.

[patsparks]

Originally Posted by PriusSport

Thanks. Does the Prius CVT feel smoother than the others? I assume it isn't either Cone & Belt or Planetary.

Neither, it is all electric and there fore is as smooth as an electric car.
There are no variable ratios just 2 electric motor/generators and some fixed ration gears.
Have a look in the tech section for more.

[patsparks]

Sorry about this everyone I can't help myself.
Little redneck humour.
What is the difference between a transexual man and a Prius?







One is gay and the other ...





... is a transexual man.

I don't agree with this but I had to post it. and I thought of it myself.

[Bill Merchant]

One of the great things about John's site, as well as PriusChat, is that there is so much information if you care to learn.

The Prius Hybrid Synergy Drive uses a planetary gear power-split device to blend the power of the electric motors and gasoline engine. There is only one gear ratio. The gears are always engaged, so there really is no neutral.

Have you found your Prius to accelerate smoothely? Smoother than any other? Efficiently going from 0 to 65 mph (or over if you don't pay attention)?

[Sheepdog]

Pat, you gotta get out and dance more! You came up with the picture and jokes waay too quickly!!

Olivia Newton John would be shocked!

[YoungOrganist]

Originally Posted by patsparks

I'm not sure what you mean by tranny, this is a tranny

That looks more like a Transaxle...

[MagneticGrayIndy]

the Civic hybrid was offered in a manual transmission... I just can't go there with the tranny jokes, sorry.. But it is not in the present model.

er.. Civic... that is

[Patrick Wong]

Originally Posted by Bill Merchant

...The Prius Hybrid Synergy Drive uses a planetary gear power-split device to blend the power of the electric motors and gasoline engine. There is only one gear ratio. The gears are always engaged, so there really is no neutral.

It is true that the gearing between the ICE, MG1 and MG2 is fixed and in that sense there is only one physical gear ratio. There exist an almost infinite number of "logical" gear ratios, hence the Prius transaxle emulates a conventional CVT.

MG1 spins clockwise and counterclockwise as needed, based upon hybrid vehicle ECU control, so that the ICE can run at the most efficient speed given the driver's demand for power, while MG2 runs at the speed required to move the car at the desired mph. MG1's ability to be flexible and rotate in either direction enables the variety of logical gear ratios mentioned above.

The traction battery provides the necessary power to supplement the ICE when the driver demands substantial power. The battery also serves as a reservoir when the ICE produces more power than required to move the car, as well as when regen braking is in effect.

[ZC1]

Originally Posted by qbee42

As Patrick states above, it's not possible in the Prius. Another way to look at it is that the Prius transmission is manual, but it only has one gear and no clutch, so there is nothing to operate when it comes to shifting. It's a completely unique system.
Tom

Not so fast. There has been one other vehicle that has had a planetary gearset with a CVT, the Prius is not unique.

This vehicle has been available since early 1980s and is still selling today.
I should know, I rode in it, worked with it and was officially trained for its repair.
Not everyone can afford or purchase it, but it was/is the M1 Abrams Tank.

The driver sits in a tight, almost claustrophobic, compartment with a shortened pair of motorcycle grips as an accelerator. If I remember correctly, no shifting necessary, except reverse and neutral. I had dissected the CVT transmission which needed an overhead crane to move it around since it weighed as much as an old Volkswagen Beetle (around 2,000 lbs). The planetary gearset was huge.

ZC1