Repost from Reddit; and then a question

Discussion in 'Gen 5 Prius Technical Discussion' started by Paul Gregory, Jul 19, 2025 at 9:43 PM.

  1. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Nor the level of vitriol. :rolleyes:
     
  2. Paul Gregory

    Paul Gregory Senior Member

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    So why have you engaged?
     
  3. bisco

    bisco cookie crumbler

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    because i was confused by your question in your first post, and thought it was regarding putting a prius in neutral.
     
  4. Paul Gregory

    Paul Gregory Senior Member

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    The point of my post was to show that based on the quoted anecdote, "neutral" in a Prius is unlikely to be just simply allowing the transmission to freewheel. I think it more likely that the traction control computer is actively achieving zero torque to the drive wheels by manipulating the electric motors.

    At least that's how it struck me. Apparently, my POV is considered some sort of aberrant behavior in the forum. Apparently, I'm supposed to "listen" to those who know better. I'd be surprised if I haven't been reported.
     
  5. ChapmanF

    ChapmanF Senior Member

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    I kinda wonder if there's anyone else reading this thread who has failed to notice that the 'quoted anecdote' was simply a story about a Prius that didn't get shifted into neutral, because the driver didn't hold the lever as required to shift into neutral.

    When bisco thought that was what the anecdote was, it's because that's what the anecdote was.


    Paul's questions, as seen reiterated in #3 (independently, one observes, of the reddit anecdote), are familiar from other threads where Paul has raised them. Where bisco wonders about understanding the Prius drivetrain in sufficient detail, it's those questions that require that kind of technical depth. Understanding the reddit anecdote does not. You gotta hold the lever till N shows up on the dash, that's the moral of the reddit anecdote.

    It's quite possible in this thread to recognize that Paul's reiterated questions aren't related to the reddit anecdote, without otherwise taking a position on them here. A reader interested in those questions would miss less of the already existing discussion by looking in the threads where they've already been discussed:

    https://priuschat.com/search/758973844/?q=neutral&t=post&o=date&g=1&c[user][0]=203815
     
    #45 ChapmanF, Jul 20, 2025 at 10:45 PM
    Last edited: Jul 20, 2025 at 10:51 PM
  6. Paul Gregory

    Paul Gregory Senior Member

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    You're just a mad strawman builder aren't you?
     
  7. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Have we reached the inevitable “irreconcilable differences” phase?
     
  8. Paul Gregory

    Paul Gregory Senior Member

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    If it's come to ignoring or dismissing what someone says, just because "we must oppose,"
    they you may be correct.

    I'm prepared to admit that the issue no longer matters; it's just a trolling battle. I withdraw.
     
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  9. bisco

    bisco cookie crumbler

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    thanks, i had totally missed your point. my bad
     
  10. ChapmanF

    ChapmanF Senior Member

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    Or, that could be the point if the reddit post had been about anything that happened when a Prius was put in neutral.

    Only, the reddit post was about a Prius that wasn't put in neutral. It went forward in D because it was in D and the driver didn't know how to put it in neutral. It went backward in R because it was in R and the driver didn't know how to put it in neutral.

    The driver did eventually figure out how to put it in neutral, but then included no further description of what the car did. Which means the reddit post contains zero words having anything to do with anything any Prius ever did in neutral.

    The questions Paul asked (and reiterated in #3) are familiar questions Paul has posed before about what happens in neutral. Those other threads are still around and the questions have been discussed there.

    There just isn't anything new about those questions that can be mined from a reddit post that says nothing about anything a Prius ever did in neutral.
     
  11. rjparker

    rjparker Tu Humilde Sirviente

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    It seems Paul is using conventional wisdom and his "common sense" to reach his assumptions on how planetary gears, power electronics, programmed logic and electric motors in the transaxle work.

    Weber State's Toyota sanctioned ecvt transaxle classes can provide a new perspective for someone's conventional wisdom and "common sense". It takes hours to digest and perhaps repeated viewings but the student learns the Toyota ecvt transaxle was a patented breakthrough technology in a cost effective package. With neutral achievable without a running engine or a functioning inverter.

    Some of these things are not decided by consensus; they don't need a vote. Can a typical owner be expected to truly understand the details? Not likely, which leaves room for conventional wisdom and "common sense".
     
    #51 rjparker, Jul 21, 2025 at 3:38 PM
    Last edited: Jul 21, 2025 at 3:57 PM
    Trollbait and Brian1954 like this.
  12. Trollbait

    Trollbait It's a D&D thing

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    How the system works, with evidence, has been explained to you multiple times. You refuse to except it, and continue to bring the topic back up elsewhere. Here you posted a story that has nothing to do with how the system works to get back on your repeated questions.

    There are no clutches, nor torque converter, in the Prius drivetrain. Free wheeling is the only possibility when in neutral. The M/Gs are perfectly fine spinning without electricity going in or out. Since M/G 2 is already spinning with the wheels when neutral coasting, there is no 'bump' when the car is put back in drive. M/G 1 spins the engine up matching revs before starting, so no 'bump' there.