Mitsubishi Outlander rear axle

Mitsubishi hybrid drive unit hacking
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aot93
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Re: Mitsubishi Outlander rear axle

Post by aot93 »

Yep the mini installation is mine, the motor is effectively upside down, it spins quite happily like this, no nasty noises from the reduction gear / diff.
Not sure how it will affect cooling etc in the longer term, but it seems happy.

Finished making the shafts last night so the real drive tests will start soon!
arber333
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Re: Mitsubishi Outlander rear axle

Post by arber333 »

aot93 wrote: Mon Jul 26, 2021 11:33 am Yep the mini installation is mine, the motor is effectively upside down, it spins quite happily like this, no nasty noises from the reduction gear / diff.
Not sure how it will affect cooling etc in the longer term, but it seems happy.

Finished making the shafts last night so the real drive tests will start soon!
What are you using for inverter? Is is original mitsubishi inverter via CAN? I wonder how it would behave if we commanded 200Nm in reverse.
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aot93
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Re: Mitsubishi Outlander rear axle

Post by aot93 »

Stock inverter with can control.

It's hard to tell until I get it on the road, but I did some tests with some high values for regen and it worked as expected.
I've had it spin in reverse at 10k RPM so there is no speed control in the inverter that I can see.
It seems to me it's a fairly dumb system and will just do what you ask.

I limit the reverse speed to -1500 RPM in code.
arber333
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Re: Mitsubishi Outlander rear axle

Post by arber333 »

aot93 wrote: Mon Jul 26, 2021 1:01 pm Stock inverter with can control..

I limit the reverse speed to -1500 RPM in code.
How do you limit speed, just by Hz or did you find a CAN report for RPM?

Tnx
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aot93
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Re: Mitsubishi Outlander rear axle

Post by aot93 »

RPM is available from the rear inverter on 0x289 bytes 2 & 3

Code: Select all

motorRPM = (msg.buf[2] * 256 + msg.buf[3] - 20000)
Then I just hard cut the torque to 0

Code: Select all

      if (motorRPM < -1500)
      {
        torqueRequest = 0;
      }
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aot93
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Re: Mitsubishi Outlander rear axle

Post by aot93 »

Big moment last night, the mini moved for the first time :D

https://youtu.be/JnUx1pAPPKg

Of course with a proper load on the motor I find new problems.
My big one being I can't seem to get much power from the motor before it shuts down.
Seems to be more than a few amps and I get a hard cut.
CAN bus commands look good, and I have by-passed the BMS limits for now.
I'm thinking possibly a problem with the inverter or maybe there is something I'm missing on the CAN side.


Edit - Found the problem, byte 6 of 0x287 should be set to 0x03
I had previously been sending the torque request on all bytes, a throw back to tracking down another problem.
So when the HI byte was at x27 it was working, but going to x28 caused it to stop.

So now we know there is another way to cut the rear inverter along with the RSDN signal!

Thanks to Damien Maguire, I was looking at the code he posted and saw it well commented in there.
MattsAwesomeStuff
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Re: Mitsubishi Outlander rear axle

Post by MattsAwesomeStuff »

aot93 wrote: Sun Aug 29, 2021 4:06 pmBig moment last night, the mini moved for the first time :D
Fuck yeah!

*pumps fist*

I was half-considering abandoning my gargantuan forklift motor and going with the Lexus MGR, seemed less likely considering the added complications, but it's good to see how fast you're progressing with the Outlander back end, especially on a skinny vehicle (so's mine).

Congrats on the milestone. You no longer have a car-shaped project, you have a car-project-that-just-needs-finishing now. Big difference. Until you get the motor moving the vehicle, it's never really a car yet, and you've progressed past that :)
Ctwidle
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Joined: Wed Jan 06, 2021 9:44 pm

Re: Mitsubishi Outlander rear axle

Post by Ctwidle »

I originally started with a Toyota MGR and a Yaris/Auris inverter. Having come to the conclusion that the MGR might not give an adequate performance for my 72’ superbug I bought and installed an Outlander rear drive. I should have read the small print first! The Outlander seems to be a permanent magnet synchronous motor and the FOC software guide states that this control system “...will not drive PMSM motors in an efficient manner.”
Could someone please clarify for me if this is a ‘do not proceed’ or ‘it’s just not the best method’.
Thanks,
Chris
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johu
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Re: Mitsubishi Outlander rear axle

Post by johu »

Maybe that note is a bit misleading. I'd be surprised if this motor wasn't an IPM, which confusingly is an abbreviation of an abbreviation and means "Interior Permanent Magnet Synchronous Motor"
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