Mg1/mg2 renamed?

Discussion in 'Gen 3 Prius Technical Discussion' started by Yippeekyaa, Aug 21, 2017.

  1. Yippeekyaa

    Yippeekyaa Active Member

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    IMG_6289.PNG IMG_6290.PNG
    I use an iPhone app to monitor temps while on road trips. On my gen 3 the electric motors were called mg1 and mg2. When I set up the app on the gen4 the naming appears to be different. They are now called the "motor generator" and the "inverter generator". This still has me confused.

    Photos are of the various options I have available to view and you can see the different naming used.
     
  2. Yippeekyaa

    Yippeekyaa Active Member

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    Oops. Got the names backwards. Sorry
     
  3. Trollbait

    Trollbait It's a D&D thing

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    I've heard nothing of an official change.
    Based on how the respective M/G are used most of the time. I'd same M/G1 is the generator, and M/G2 the motor.
     
  4. CooCooCaChoo

    CooCooCaChoo Active Member

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    Pretty sure they still both do the same thing. They've been redesigned and moved around is all.
     
  5. Prodigyplace

    Prodigyplace Senior Member

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    I was thinking the software vendor did not know the Prius MG1 & MG2 terminology.
     
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  6. Elektroingenieur

    Elektroingenieur Senior Member

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    The parameter names in the app, with “Generator” or “Motor” rather than “MG1” or “MG2,” appear to be the same as those used in Toyota’s Techstream diagnostic software. For example, “Generator Inverter Calculated Temperature just after IG ON,” from @Yippeekyaa's second screen shot, appears in the Hybrid Control Data List in Techstream with exactly the same spelling and capitalization.

    Toyota’s Repair Manual and New Car Features books still refer to the two※ synchronous machines in the fourth-generation Prius as the “Motor Generator No. 1 (MG1),” “Generator (MG1),” or “MG1” and “Motor Generator No. 2 (MG2),” “Motor (MG2),” or “MG2.”

    ※ Except Prius with E-Four (ZVW55; Japan only), which also has “MGR (Motor Generator Rear).”
     
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  7. Yippeekyaa

    Yippeekyaa Active Member

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    That makes sense as the app searches for all available pids from the cars CPU. Only costs 10$ for the full diagnostic suite on the app plus 3.99 for the app itself. Finding it very useful and customizable.
     
  8. Prodigyplace

    Prodigyplace Senior Member

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    What is the app name? Inquiring minds want to know...
    Does it just display data or can you set things like the reverse alert?
     
  9. Yippeekyaa

    Yippeekyaa Active Member

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    It's called obd fusion. I'll do a full write up about it tonight. Been playing with the app for a year now. Does basically everything techstream does. You can customize gauges for everything, as many pages of gauges you want. I disabled the reverse beeps on both prii with it and the rear passenger seat belt in the new Prius. Dog kept setting it of which was rather annoying.
     
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  10. Prodigyplace

    Prodigyplace Senior Member

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    @Tideland Prius may want to add this information to the PC Glossary. Perhaps Toyota is moving away from the MG1 / MG2 naming.
     
  11. Prodigyplace

    Prodigyplace Senior Member

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    So, if we have a Generator, how long until somebody wants to "upgrade" from a Generator to an Alternator? :eek:
    I see discussions like that on older tractor forums.
     
  12. Tideland Prius

    Tideland Prius Moderator of the North
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    Done.

    So what happens in the Prime when the clutch is disengaged and MG1 and MG2 work together? :D
     
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  13. CooCooCaChoo

    CooCooCaChoo Active Member

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    With their powers combined, they become MG3!
     
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  14. Prodigyplace

    Prodigyplace Senior Member

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    I guess then we have motor + generator just to confuse things further. :eek:
     
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  15. Yippeekyaa

    Yippeekyaa Active Member

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    There are a few other pids in the list and I don't have a clue what they are. Hang on I'll grab some screenshots. Something about boosting invertor and boosting controller.

    IMG_4577.JPG IMG_4578.JPG IMG_4579.JPG IMG_4580.JPG

    First photo, is boosting converter vacuum boost? Second photo, insulation resistance on the various motors? Third photo, short wave values? Fourth photo, v phase current? I'm cluless what those are or mean.
     
    #15 Yippeekyaa, Aug 27, 2017
    Last edited: Aug 27, 2017
  16. Elektroingenieur

    Elektroingenieur Senior Member

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    Toyota’s Repair Manual explains each parameter in the Data List/Active Test section for the relevant system.
    No, the boost converter is part of the inverter with converter assembly in the hybrid system. As Toyota’s New Car Features book explains, it “Boosts the HV battery nominal voltage of DC 201.6 V / DC 207.2 V up to a maximum voltage of DC 600 V and vice versa (steps down DC 600 V to DC 201.6 V / DC 207.2 V).”
    From the New Car Features book: “The leak detection circuit constantly monitors that the insulation resistance between high-voltage circuits and body ground is maintained. [...] The leak detection circuit has an AC source and causes a small amount of AC to flow to the high-voltage circuit (positive and negative). The more insulation resistance decreases, the more voltage steps down at the detection resistor and the lower the waves of AC. The insulation resistance value is detected based on the amplitude of AC waves.”

    In the parameter names, “short wave” refers to the AC source in the leak detection circuit; “MG Inv,” motor and generator inverter; “A/C Inv,” air conditioning inverter; and “SMR,” system main relays.

    The Repair Manual section for DTC P0AA649, “Hybrid/EV Battery Voltage System Insulation Resistance Decreased,” and its unsavory associates, P1C7C49, P1C7D49, P1C7E49, and P1C7F49, has more about this.
    MG1 and MG2 are three-phase machines, and Toyota uses the letters U, V, and W to identify the three phases.
     
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  17. Yippeekyaa

    Yippeekyaa Active Member

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    Thanks so much for that info. Very helpful.
     
  18. kalamazandy

    kalamazandy New Member

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    I purchased that app already, but I am having troubles finding the right PID for the backup beeps. I was wondering if you had any resources to point me in the right direction. I learned Charista has it built in, but that's another 20 bucks. I'll spend it if I have to, but since I already have another, seemingly capable app, I'd like to just figure that out.
    I found another page using Torque, but I think that's specifically using Android (which I don't have). But that one was cool because you can send different terminal instructions to do things like change the beep to One beep instead of continuous, or turn it off completely.
    I'd love some help if you could.
     
  19. alanclarkeau

    alanclarkeau Senior Member

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    If you're about to buy a Gen 4, insist on the dealer removing the backup beeps before delivery - they should do it for free.
     
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  20. kalamazandy

    kalamazandy New Member

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    No, I bought a used 2011. I already used the ODB Fusion app, so I was just trying to figure out how to get the PID for it.