Switching from EV to Hybrid in Cold Weather

Discussion in 'Prime Main Forum (2017-Current)' started by YarSher, Dec 21, 2018.

  1. YarSher

    YarSher New Member

    Joined:
    Dec 21, 2018
    1
    0
    0
    Location:
    Rochester
    Vehicle:
    2018 Prius Prime
    Model:
    Plug-in Advanced
    Hello,
    I'm new to EVs. Just bought my first Prius Prime a month ago.
    Living in upstate NY the weather is pretty cold. I was wondering if switching to a hybrid will affect the gas engine?
    On a few occasions, I was driving my car in EV mode, then the car run out of charge so it switched automatically to the gas engine. Is it ok to suddenly start the gas engine? I know it's recommended to warm up the engine in cold weather.

    Please advise
     
  2. Salamander_King

    Salamander_King Senior Member

    Joined:
    Nov 8, 2015
    8,753
    7,022
    0
    Location:
    New England
    Vehicle:
    2021 Prius Prime
    Model:
    Limited
    Welcome to PC. No need to worry. This is a very smart car, it decides when it's time to change over to HV, or you can switch to HV any time if you so desire. AFAIK, even pure gasoline cars do not require an engine warm up.
     
    jerrymildred and breakfast like this.
  3. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    94,639
    42,898
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    congrats and welcome!
    probably fine, but i like to do it ahead of time when there won't be much engine needed, avoiding a start at high speed, uphill, or hard acceleration.

    you can't always know, but usually can judge that you won't have enough ev to complete your trip when there's only a mile or two left.

    all the best with your new prime!(y)
     
  4. bwilson4web

    bwilson4web BMW i3 and Model 3

    Joined:
    Nov 25, 2005
    24,624
    14,012
    0
    Location:
    Huntsville AL
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Plus
    When the engine first comes on, the car continues to run on electricity until the engine has warmed enough, ~45 seconds, for the catalytic converter to start working. In effect the engine is idle and then it takes over the load. You'll see this as a 1-3% decrease in battery SOC until it takes on the load. Then the car will add enough charge to come close to the original SOC.

    If you have a choice, put the car in hybrid mode when beginning a descent. This will ensure the car does not see a high power requirement before the catalytic converter is running. It minimizes the initial 'warm-up' fuel burn.

    Bob Wilson
     
    heiwa and jerrymildred like this.
  5. john1701a

    john1701a Prius Guru

    Joined:
    Jan 6, 2004
    12,218
    4,898
    57
    Location:
    Minnesota
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    Not sure where you came across that. It's a misconception.

    5 winters in Minnesota with my Prius PHV confirmed it was a non-issue. As mentioned, the system goes out of its way to prevent stress on the engine while warm-up is taking place, even if you are accelerating onto a highway at the time... which I did routinely, living just 3 blocks from one on my commute. Here's a real-world example the other direction, with the engine firing up while on the highway:



    Last year was my first winter in Minnesota with Prius Prime. This video shows the warm-up process taking place, triggered while driving in conditions below the heat-pump threshold... complete with ODB-II data. So, it's a sweet example of what you want to know more detail about:

     
  6. jerrymildred

    jerrymildred Senior Member

    Joined:
    Oct 28, 2016
    10,031
    12,294
    0
    Location:
    Tampa, FL
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    Gotta love how you can get 50+mpg with a stone cold engine in a PiP or a Prime. Well, really any Prius. Granted, you have to put that back into the battery when the engine warms up, but it's still amazing. Thanks for the vids, @john1701a.
     
Loading...