Author Topic: Jazz 1.5 i-MMD Muddle between e-CVT or e-HEV  (Read 711 times)

Whatsisname

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Jazz 1.5 i-MMD Muddle between e-CVT or e-HEV
« on: February 01, 2023, 08:30:47 PM »
The Mark 4 Jazz is properly an e-HEV ie Hybrid Electric Vehicle. What on earth is this crazy e-CVT
eg e electric CVT Continuously Variable Transmission, as in the old two opposed cone and belt drive. OK you argue that it is Variable, there is nothing variable in terms of drive, such as changeable gear ratios as in a shift gearbox. or belt and cone. The only variability is speed that it spins at. I had a garage mechanic tell me that it doesn't have gears, yes it does but in fixed gear train ratio's. One train from the engine through a multi-plate clutch hydraulically actuated and the other from an electric motor's rotor fixed directly in the train to the road wheels. The electric motor train also has a generator rotor on the same shaft, further away from the wheel drive. There is also a safety break away clutch and flywheel combined just before the differential drive output in case of dramatic torque shock.
Hence, the electric drive motor and generator are directly connected and acting in tandem with the road wheels at all times. When more power is required the engine is connected through the multi-plate clutch and both drives supply the wheels. Incidentally the electric motor/generator and petrol engine have their independent oil systems, oil pumps and water cooling systems. So Honda, please stop using the CVT label and perhaps e-Torque Hybrid, e-SpinnyThingummy, or something more suitable
This is a must if you want to see the trains being assembled as a teaching guide

cool video for gear ratio enthusiasts. Enjoy

Marco1979

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Re: Jazz 1.5 i-MMD Muddle between e-CVT or e-HEV
« Reply #1 on: February 01, 2023, 09:18:55 PM »
Very interesting video; clearly explained.
I think that names also have to do with marketing. People know CVT already, and now it is sort of an electronic version of that. They tried MMD for a short time but that didnít catch on. But indeed, mechanically it is not a CVT.

In NL the terms BEV, HEV and PHEV are now being used by nearly all manufacturers. I like it! Makes comparisons easier. So e:hev makes sense.

Whatsisname

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Re: Jazz 1.5 i-MMD Muddle between e-CVT or e-HEV
« Reply #2 on: February 02, 2023, 05:32:25 PM »
Marco1979 et al,
Yet more interesting stuff for logic control of eHEV

Kremmen

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Re: Jazz 1.5 i-MMD Muddle between e-CVT or e-HEV
« Reply #3 on: February 03, 2023, 04:52:09 AM »
I agree, it's basically electric drive and you never see any EV's being quoted as CVT
Let's be careful out there !

SebastianTR

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Re: Jazz 1.5 i-MMD Muddle between e-CVT or e-HEV
« Reply #4 on: February 03, 2023, 05:27:03 AM »
Good stuff I should whatch it asp

Whatched.

How?
« Last Edit: February 03, 2023, 07:59:40 AM by SebastianTR »
Cheers!

John Ratsey

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Re: Jazz 1.5 i-MMD Muddle between e-CVT or e-HEV
« Reply #5 on: February 03, 2023, 07:10:29 PM »
It's continuously variable in that the engine speed isn't a fixed proportion of the road speed (except when in the direct drive mode). However, I agree that the e-CVT description is misleading and is bad marketing as it has put off some people who have had negative experiences with real CVT transmissions.
2022 HR-V Elegance, previously 2020 Jazz Crosstar

Kremmen

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Re: Jazz 1.5 i-MMD Muddle between e-CVT or e-HEV
« Reply #6 on: February 04, 2023, 04:21:00 AM »
As far as I can tell that top CVT video isn't a Honda created one.
Let's be careful out there !

SebastianTR

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Re: Jazz 1.5 i-MMD Muddle between e-CVT or e-HEV
« Reply #7 on: February 04, 2023, 07:37:45 AM »
As far as I can tell that top CVT video isn't a Honda created one.

Probably but that's videos show something we talk about this topic.

Cheers!

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