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Why do hybrids use CVT transmission?

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Old 19 Jul 2010, 02:48 pm   #1 (permalink)
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Default Why do hybrids use CVT transmission?
Why do hybrids use CVT transmission?
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Old 19 Jul 2010, 02:51 pm   #2 (permalink)
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most quality new cars are switching to CVT tranmissions as they are very smooth and enjoyable to drive. consdiering hybrid cars are new and supposed to be enjoayble to drive, i guess they are all fitted with CVT transmission.
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Old 19 Jul 2010, 02:55 pm   #3 (permalink)
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Not all hybrids do. For instance the Honda IMA "Assist" hybrids have the single motor/generator integrated into the engine flywheel and as such can use any transmission type although the original Insight offered either a 5 speed manual or a cone-and-belt CVT.































Toyota, Nissan, and Ford series/parallel "full" hybrids all use "CVTs" which aren't really CVTs at all but just emulate one. This is so because unlike other types the hybrid and "transmission" functions are one in the same. CVTs use cones (pulleys, sheaves) and a belt or discs and rollers to control the effective ratio. Toyota's HSD and others like it use 2 motor/generators and a PSD to control the ratio. MG1 spinning free is neutral, MG1 turning fast with low torque and MG2 turning slow with high torque is equivalent to low gear, MG1 turning the same RPM as MG2 is direct drive, and MG1 turning slow either forward or backward with high torque and MG2 turning fast with low torque is overdrive.































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Old 19 Jul 2010, 02:58 pm   #4 (permalink)
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Short answer: to squeeze every bit of economy out of the engine. With a regular transmission you are limited to 5 or 6 gear ratios. With a CVT you can always be at the ratio for maximum efficiency, or performance. They are also a lot smoother than normal trannys because instead of shifting gears, there is a belt that slides up or down between two cones to change ratios . As a driving enthusiast I'm not entirely sold on them though. I think they're a bit boring, and I'd miss the sound and feel of going through the gears. Like if you floor it in a CVT the transmission just rolls up to whatever RPM and just sits there whining. They're less involving, but of course some people like that.
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