Chevy Bolt transmission/motor

billr

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I watched a good video today (1 hr!) on complete disassembly of that; just for learning about it. I hope I never have to go that deep into one. The unit is quite simple to understand except for the "transmission mode actuator". What does that do? There is talk (in the video) about it controlling P/N/D/R operation. It can obviously drop a pawl into place for P, but there is no way the gearing can change; either to disconnect or N or reverse for R. The motor is direct-coupled to the diff with D/N/R all being set by how the motor is driven electrically. Any guesses?
 

billr

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"...simple to understand except for the "transmission mode actuator". What does that do?"

Got it? What does the trans mode actuator actually do, besides set the pawl for P?
 

nickb2

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damn, I knew my engilish was ok, but here, must be me or my incomprehension.

Ok screw it, the pdf for some reason won't work

So I will f ing screen it. Computer bug right now I really don't need to fix. There is absolutley no hybrib control module in a bolt, catch 22 they used the volt module to cheap out, so have to deal with that also. Screenshot (17).png
 

nickb2

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So, when u use the "not used" assignation, there is still a connectivity issue, codes you have to ignore for some lazy ass guy at gm. If the module ain't used in circuit, why is even there in first place?

That wiring is more than enough to send a young buck into weeds.

BTW, I was down time, from c6 to c7 sectional. :eek:
 

billr

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No pawl??? I think there is. Take a peek at any picture of the gears, there is a coarse cog-wheel on the end of the "countershaft". Also, go to about minute 19 in the video below; the cog-wheel and pawl that drops into it are obvious to me.

insideevs.com/news/341631/chevrolet-bolt-ev-traction-motor-deep-dive-video/

Thanks for the recent schematic, that is showing the drive motor and its sine/cosine resolver.

I am discouraged to see the Volt's hybrid controller and stuff seems to be being "re-purposed". I understand the necessity, to keep development cost down, but it sure makes the BEV Bolt system more complicated than it needs to be. It also looks like there are redundant serial comm lines between all the modules. Again, I understand why, to ensure highest reliability, but it makes it more complicated to understand or trouble-shoot.
 
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