1. Attachments are working again! Check out this thread for more details and to report any other bugs.

Simple quaestion turning off gas engine

Discussion in 'Gen 2 Prius Main Forum' started by IABoy, Feb 14, 2011.

  1. IABoy

    IABoy Junior Member

    Joined:
    Aug 4, 2010
    36
    0
    0
    Location:
    Iowa
    Vehicle:
    2011 Prius
    Model:
    N/A
    How does Prius turn off gas engine when not needed? Turns off ignition, stops gas supply, or does both?

    Second, how does Prius get the engine to start so quickly and smoothly first thing in morning, unlike my van engine that you have to crank for 5 seconds to get it going?
     
    #1 IABoy, Feb 14, 2011
  2. fotomoto

    fotomoto Senior Member

    Joined:
    Apr 22, 2009
    5,608
    3,788
    0
    Location:
    So. Texas
    Vehicle:
    Other Hybrid
    EV mode in the gen III prius can keep the gas engine (ICE) off under certain conditions but it's pretty limited in stock form.

    The ICE in the hybrid system doesn't use or have a conventional starter motor. Instead it capitalizes on the high voltage electric motor side of the hybrid design which can spin up the ICE nearly effortlessly.
     
    #2 fotomoto, Feb 14, 2011
  3. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    110,144
    50,053
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    a) good question
    b) how old is your van? i havn't had a car with efi and ei take longer that a second or two to start under the worst conditions.
     
    #3 bisco, Feb 14, 2011
  4. magic-man

    magic-man New Member

    Joined:
    Aug 23, 2010
    31
    6
    0
    Location:
    Trinidad
    Vehicle:
    2009 Prius
    Model:
    N/A
    It turns off the signal to the injectors and stops the signal to the coils.
    The smooth startup is because it uses the propulsion motor to spin up the engine to idle speed, then turns on the injectors and coils(spark).

    The older engines start rougher since they must dump in fuel, spin the engine a LOT slower than idle speed, then ignite the gasoline, which speeds up the engine.
     
    #4 magic-man, Feb 14, 2011
  5. uart

    uart Senior Member

    Joined:
    Sep 7, 2009
    4,215
    1,202
    0
    Location:
    Australia
    Vehicle:
    2005 Prius
    Because the Prius has an 11kW (15 HP) starter motor! That is, the motor/generator MG1.
     
    #5 uart, Feb 14, 2011
(You must log in or sign up to post here.)