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Engine cycling rapidly/delayed rev

Discussion in 'Gen 2 Prius Technical Discussion' started by Cessna157, Nov 13, 2007.

  1. Cessna157

    Cessna157 Junior Member

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    Vehicle:
    2010 Prius
    Model:
    II
    2 items I have noticed Ruby doing occasionally:

    1) Upon first start, as I power the system up, the ICE does its normal startup and warmup. It usually runs at idle as I back out of the driveway and accelerate. But as I gently accelerate, the ICE does not gradually join in the accel until reaching about 20MPH or so, then it jumps in revs rapidly. Has anyone else observed this delayed engine acceleration.

    2) On very cold days (usually below freezing), with the heater on, the ICE will cycle on and off rapidly. I may pull up to a stop light, the ICE will stop for less than a second, start back up for 1-2 secs, then shut back down, and keep repeating this cycle. Anyone else expereiced this little cold weather quirk?
     
    #1 Cessna157, Nov 13, 2007
  2. wb9tyj

    wb9tyj 2017 Prius Prime Advanced

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    <div class='quotetop'>QUOTE(Cessna157 @ Nov 13 2007, 07:50 PM) [snapback]539143[/snapback]</div>

    Its Normal...mine has been doing that for almost 4 years...
     
    #2 wb9tyj, Nov 13, 2007
  3. bestmapman

    bestmapman 04, 07 ,08, 09, 10, 16, 21 Prime

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    Hi from Cincinnati,

    This seems normal. When the car first starts up it goes into Phase 1. In this phase the car wants to use the battery for acceleration.

    Here is a description of the phases. Phases Description

    Good to see another Cincinnati Priuschatter. Where did you purchase your Prius?
     
    #3 bestmapman, Nov 13, 2007
  4. Cessna157

    Cessna157 Junior Member

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    Vehicle:
    2010 Prius
    Model:
    II
    <div class='quotetop'>QUOTE(bestmapman @ Nov 13 2007, 07:41 PM) [snapback]539169[/snapback]</div>
    This is my 2nd car purchased from Performance Toyota on Rt. 4 in Fairfield. I previously owned a 2000 Corolla. Performance is one of the best dealerships I've been to in terms of service, customer satisfaction, etc.

    From what dealership does your Prius hail?
     
    #4 Cessna157, Nov 13, 2007
  5. qbee42

    qbee42 My other car is a boat

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    Before the engine warms up, the Prius tries to mostly use the electric motor (MG2) and keep the engine at low revs. If you push it, it will draw more power from the engine, and when it does, it really tachs up. Try to go easy on the gas until the engine warms up.

    As for cycling on and off, this sounds like a situation where the state of charge (SOC) is high. When the battery SOC is overly high, the control system spins the engine without gas to burn off some of the excess charge. Driving down long hills can cause a high SOC, as well as the engine running a lot to keep the cabin warm.

    Tom
     
    #5 qbee42, Nov 13, 2007
  6. 9G-man

    9G-man Senior Member

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    Good to know! I've experience this since it's cooled down lately, the rapid shut-down/restart after having run only briefly.
     
    #6 9G-man, Nov 14, 2007
  7. bestmapman

    bestmapman 04, 07 ,08, 09, 10, 16, 21 Prime

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    <div class='quotetop'>QUOTE(Cessna157 @ Nov 13 2007, 09:29 PM) [snapback]539212[/snapback]</div>
    Beechmont Toyota. I've had it sence March.
     
    #7 bestmapman, Nov 14, 2007
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