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gen 3 engine vs hv battery switching speed

Discussion in 'Gen 3 Prius Main Forum' started by freebird1, Jan 21, 2022.

  1. freebird1

    freebird1 Junior Member

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    is there any speed at which engine starts to kick in vs HV battery
    like 15m or 20mph
    no codes on HV but its greenbean battery
    its random when gas engine uses gas to power hv battery,drive sometimes even 10mph
    could be the HV battery is not strong ?
     
    #1 freebird1, Jan 21, 2022
  2. bisco

    bisco cookie crumbler

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    anything is possible with any rebuilt battery, you'd have to put a scanner on it. but if you're not getting any trouble lights, or even the fluctuating battery gauge, it probably isn't too bad.
    engine firing is based on acceleration and other externals like ambient temp and hvac use.
    that being said, there is an ev limit of 43mph iirc.
     
    #2 bisco, Jan 21, 2022
    freebird1 and Henrik Helmers like this.
  3. freebird1

    freebird1 Junior Member

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    thx bisco ,the engine is replaced jdm ,current bmp 25mpg ,looking to see how the mpg on the new engine adjust to ev and fuel use vs ev use
     
    #3 freebird1, Jan 23, 2022
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  4. CharlesPrius

    CharlesPrius Member

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    I wonder this too. Mine is oem battery replaced under warranty 110k miles ago, and i still get 47-49mpg. But the ICE start is a bit rough sometimes. I guess it's just general wear of the gears. I mean, it does have 225k miles now.
     
    #4 CharlesPrius, Jan 24, 2022
  5. fuzzy1

    fuzzy1 Senior Member

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    If you are trying to use the EV button for electric propulsion, with the ICE warmed up, it will cancel EV mode and fire up the ICE at 25 mph. Though when gliding and under some other circumstances, the ICE may not be forced to spin until about 46 mph in a Gen3 Liftback (slightly different on other bodies and vintages).

    If the ICE is not warmed up, but engine coolant is above 68 F (on U.S. models), then EV cancels at 10 mph. When that coolant is below 68 F, EV mode is not available, and the ICE will turn on regardless.

    But as Bisco mentioned, there are other factors that can kick on the ICE earlier.
     
    #5 fuzzy1, Jan 24, 2022
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  6. AzusaPrius

    AzusaPrius Senior Member

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    Although I have the aftermarket lithium pack from Dr. Prius.
    I can get over 50mph before the ICE kicks on.

    Also the ICE will remain on during warm up until 104F.

    I have been on the freeway at over 70mph with just the HV.
    ICE is off at that time until I push the gas harder.
     
    #6 AzusaPrius, Jan 24, 2022
  7. fuzzy1

    fuzzy1 Senior Member

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    By "ICE is off", do you mean just no fuel burn, or not even spinning? On unmodified Gen3 Liftbacks, the ICE is spun at 46+ mph to prevent MG1 overspeed, even if no fuel is being burned (i.e. ICE is driven by MG1, not by gasoline).
     
    #7 fuzzy1, Jan 24, 2022
  8. AzusaPrius

    AzusaPrius Senior Member

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    I believe it spins still at just under 1000 rpms.
    What I was talking about is power with arrows from the ICE.

    So when I would travel at those speeds, the power arrows are coming only from the HV battery not the ICE.
     
    #8 AzusaPrius, Jan 24, 2022
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  9. privilege

    privilege Active Member

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    nimh battery :
    ev mode- accelerates fine until 24 mph, then switches on the gas engine
    eco/regular/power mode- accelerates much softer but can go over 40 mph n electric only, if you're careful about how much you press

    the state of charge, engine temperature, and acceleration requested all play a role
     
    #9 privilege, Jan 24, 2022
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