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My Prius comes out of EV mode at 30mph

Discussion in 'Gen 2 Prius Technical Discussion' started by prius2go, Aug 21, 2007.

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  1. prius2go

    prius2go Member

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    why?
    I thought it was supposed to be 34mph
    Is there a way of raising it to about 38mph B)
    I know about the MG1 rev issue
     
    #1 prius2go, Aug 21, 2007
  2. hybrid taxi

    hybrid taxi Junior Member

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    <div class='quotetop'>QUOTE(prius2go @ Aug 21 2007, 06:27 PM) [snapback]500001[/snapback]</div>
    the issue is what ?
     
    #2 hybrid taxi, Aug 21, 2007
  3. prius2go

    prius2go Member

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    or was it MG2 :p

    Due to the epicyclic gearbox the engine (ICE) has to start up to prevent one of the electric motors over revving above a certain speed
    which I thought was higher than 30mph
    I think its in the useful sticky stuff at the top of this forum
     
    #3 prius2go, Aug 21, 2007
  4. geodosch

    geodosch Member

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    <div class='quotetop'>QUOTE(prius2go @ Aug 21 2007, 07:27 PM) [snapback]500001[/snapback]</div>
    It's not just the MPH. If you accelerate too quickly, or if your SOC drops too low, it will exit EV mode.
     
    #4 geodosch, Aug 21, 2007
  5. philmcneal

    philmcneal Taxi!

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    <div class='quotetop'>QUOTE(GeoDosch @ Aug 21 2007, 05:32 PM) [snapback]500032[/snapback]</div>

    54 km/h is the max ev mode speed, you can engage ev at 55km/h but i find it sometimes kick me out so i use 54km/h as a safe bet.

    soc below 50% EV mode will not engage, lowest i've seen in ev mode is 48% (two pink bars).

    coolant must be above 40 degrees C and engine must be finished with "enrichment fuel mode" when starting the engine for the first time (anyone know how to bypass this stupid step please let me know since i use an engine block heater)
     
    #5 philmcneal, Aug 21, 2007
  6. ken1784

    ken1784 SuperMID designer

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    <div class='quotetop'>QUOTE(prius2go @ Aug 22 2007, 08:27 AM) [snapback]500001[/snapback]</div>
    Because UK Prius manual says the EV mode is canceled at 28 mph.
    Japaanese Prius manual says it is 55 km/h (34 mph).

    Ken@Japan
     
    #6 ken1784, Aug 21, 2007
  7. Wayne

    Wayne Active Member

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    You have to be reasonably gentle to get to 34 MPH. I typically exit in the high 20's... Acceleration matters.
     
    #7 Wayne, Aug 22, 2007
  8. prius2go

    prius2go Member

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    <div class='quotetop'>QUOTE(ken1784 @ Aug 22 2007, 03:30 AM) [snapback]500084[/snapback]</div>
    Ken that looks like the reason
    Is there different software for different markets?
    Or a config setting somehwere?
     
    #8 prius2go, Aug 22, 2007
  9. ken1784

    ken1784 SuperMID designer

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    <div class='quotetop'>QUOTE(prius2go @ Aug 22 2007, 04:30 PM) [snapback]500167[/snapback]</div>
    I believe so.
    I'm curious how they are wrriten on other EU/AU/NZ Prius manuals.
    I don't think the setting is configurable.

    Ken@Japan
     
    #9 ken1784, Aug 22, 2007
  10. T-spirit

    T-spirit New Member

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    Mine drops out at between 30mph and 32mph. UK Spec T-Spirit.

    Was quite surprised as the manual says 28mph (which is a bit annoying if that is the case)
     
    #10 T-spirit, Aug 23, 2007
  11. prius2go

    prius2go Member

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    I seem to drive in quite a bit of traffic which moves at around 30mph - dropping to 20-25mph - rising to 35mph.
    Before getting the car I thought it was all within the EV mode.

    Do you think they found excessive UK initial battery failures so backed off the setting?
     
    #11 prius2go, Aug 23, 2007
  12. hobbit

    hobbit Senior Member

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    If you start accelerating gently in EV and just lock your foot at
    that position, you're demanding a steady amount of torque but over
    an increasing range of RPM. *Power* is torque * RPM. Power is also
    volts * amps. So even with your foot steady, battery current tends
    to climb since its voltage is essentially constant. Once you're
    asking for 10 kilowatts, poof, that's the engine turn-on threshold
    [at nominal six-bars SOC]. To stay EV-only right up to 40 mph,
    you'd have to keep feathering your foot back and back and accelerate
    less hard as you approached it, which generally doesn't work mixed
    up in today's traffic -- you'd also be using a lot of battery, which
    hurts overall MPG.
    .
    So don't worry about it...
    .
    _H*
     
    #12 hobbit, Aug 23, 2007
  13. ken1784

    ken1784 SuperMID designer

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    <div class='quotetop'>QUOTE(T-Spirit @ Aug 23 2007, 08:00 PM) [snapback]500900[/snapback]</div>
    The speedometer dispaly is intentionally biased to meet "UN-ECE Regulation No. 39".
    http://priuschat.com/index.php?showtopic=37586&st=1

    Japanese manual says it is 55 km/h, but my speedometer reading is 61 km/h when the EV mode is canceled. :rolleyes:

    Ken@Japan
     
    #13 ken1784, Aug 23, 2007
  14. prius2go

    prius2go Member

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    that spec only says the speed should read fast
    i.e between 0% fast
    and 10% +4kph fast
    it doesnt say it should be that fast!

    I thought manufacturers aimed at 3% fast to allow for tyre wear

    are you really saying the Prius is set to be 10% fast :unsure:
    if so that would mean choosing tyre size with a 10% bigger rolling radius to bring it back into line

    If I have that the right way around
     
    #14 prius2go, Aug 23, 2007
  15. ken1784

    ken1784 SuperMID designer

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    <div class='quotetop'>QUOTE(prius2go @ Aug 24 2007, 02:39 AM) [snapback]501079[/snapback]</div>
    I believe our passenger cars are categories M, so the upper limit is 10% +6km/h fast.
    IMHO, it says the speed should not read below actual.
    Yes, my 2004 Japanese Prius tells me +6 km/h fast.
    The later Japanese model tells us +3 km/h fast.

    Ken@Japan
     
    #15 ken1784, Aug 24, 2007
  16. Doc Willie

    Doc Willie Shuttlecraft Commander

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    <div class='quotetop'>QUOTE(prius2go @ Aug 23 2007, 01:39 PM) [snapback]501079[/snapback]</div>
    My ScanGauge reading is presently half fast.

    Still working on the calibration.
     
    #16 Doc Willie, Aug 24, 2007
  17. prius2go

    prius2go Member

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    If I buy a US ECU will that set it back to 34mph?
     
    #17 prius2go, Sep 17, 2007
  18. wiiprii

    wiiprii New Member

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    Our 2007 Prius can drive in EV mode up to 40mph. Once it turns to 41mph the engine will turn on no matter what.

    I drive 35-40mph with the engine off all the time. I don't think 34mph is the limit.
     
    #18 wiiprii, Sep 17, 2007
  19. prius2go

    prius2go Member

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    <div class='quotetop'>QUOTE(ken1784 @ Aug 22 2007, 03:30 AM) [snapback]500084[/snapback]</div>
    Does it say 34mph in US manual? - anyone?

    Checking realtionship between value in manual and actual :huh:
     
    #19 prius2go, Sep 17, 2007
  20. ken1784

    ken1784 SuperMID designer

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    <div class='quotetop'>QUOTE(wiiprii @ Sep 18 2007, 05:55 AM) [snapback]513892[/snapback]</div>
    We are talking about EV switch cancel speed, not pure EV drive mode up to 40 mph.
    <div class='quotetop'>QUOTE(prius2go @ Sep 18 2007, 06:06 AM) [snapback]513895[/snapback]</div>
    No description because the US Prius does not have the EV switch.

    Ken@Japan
     
    #20 ken1784, Sep 18, 2007
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