Slipping like sound when accelerating

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by PriuSocal, Mar 31, 2023.

  1. PriuSocal

    PriuSocal Member

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    Im wondering if this is normal or not as mentioned new to certain functions of the hybrids. So when accelerating it almost feels like when a slipping transmission occurs on a normal non-hybrid car and takes much longer to catch up speed. I notice the more bars the hybrid battery has or closer to the green, the less the acceleration slip is felt so is this because of the electric assist or could there be a lingering transmission issue.

    Heard these transmissions are an "electric" CVT and not like normal mechanical CVT's which I haven't gotten to that in my research list and prefer to ask the experts.

    No CEL's, 12v battery or HV battery issues.
     
    #1 PriuSocal, Mar 31, 2023
  2. bisco

    bisco cookie crumbler

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    i think what you're feeling/hearing is the engine wind up vs acceleration. with more battery charge, the engine doesn't have to work as hard.
    undoubtedly, your 15 year old has some wear as well.

    it's normal, and if you're new to hybrids, the best thing you can do is find a model for sale to see if it feels the same.
     
    #2 bisco, Mar 31, 2023
  3. jdenenberg

    jdenenberg EE Professor

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    There are no clutches in your drivetrain and therefore nothing that can slip. (other than the torque limiters which are there to protect the drivetrain from sudden changes in traction). The little engine (76 HP) needs to rev up to provide HP if you are asking for acceleration, especially if the traction battery charge is low and cannot provide the extra power needed.

    JeffD
     
    #3 jdenenberg, Mar 31, 2023
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  4. PriuSocal

    PriuSocal Member

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    Looks like that answers my questions lol.
    Now I know why prius drivers are always slow to take off lmao.
     
    #4 PriuSocal, Mar 31, 2023
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  5. bisco

    bisco cookie crumbler

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    the new one is much faster, but only because of a larger engine.

    however, some of us are trying to accelerate in a way that uses no energy at all :)
     
    #5 bisco, Mar 31, 2023
  6. PriuSocal

    PriuSocal Member

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    Yeah I test drove a 2011 before getting this one and that PWR mode sure does kick. I honestly prefer the body style of the 3rd gen but the reliability and mpg of these 2nd gens.
     
    #6 PriuSocal, Mar 31, 2023
  7. Tombukt2

    Tombukt2 Senior Member

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    Just imagine driving the new Corolla GR what's that the 3 cylinder turbo that makes 268 horsepower and is having all kinds of failures right now It's in all the news feeds It's the same mention that went in the hyped up Yaris which I don't think ever came to this country ......talk about winding up
     
    #7 Tombukt2, Apr 1, 2023
  8. mr_guy_mann

    mr_guy_mann Senior Member

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    There is no "slip" with this powertrain design. There is no real direct correlation between engine RPM and vehicle speed.

    There are three elements to the planetary gearset inside the transmission. 1)the engine (aka Internal Combustion Engine), 2)MG1, 3)MG2 (connected to the wheels). Controlling any two will determine the speed of the third.

    Example- when you "start" the car up (go Ready), MG2 is fixed because the parking pawl "locks" the drive wheel output. MG1 is powered which forces the ICE to spin and start.

    The hybrid control ecu can blend all 3 continuously to achieve its primary "goals"- moving the car while keeping the HV battery charged.

    The ecu can increase engine RPM and use that to spin MG1 and charge the battery. Or it can "hold" MG1 and send the torque to MG2 and the drive wheels. Or a combination of both.

    Here's a post that goes into the Prius system design.
    https://priuschat.com/index.php?posts/376040

    Posted via the PriusChat mobile app.
     
    #8 mr_guy_mann, Apr 1, 2023
    Last edited: Apr 1, 2023
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