2010 Prius 2ZR-FXE engine efficiency map

Discussion in 'Gen 3 Prius Technical Discussion' started by ken1784, Jun 1, 2009.

  1. ken1784

    ken1784 SuperMID designer

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    Hello all,
    One of Japanese Prius enthusiasts posted following charts on our community.
    He agreed to post them here on PriusChat.

    edit: the charts source: Toyota's article titled "Development of New 1.8-Liter Engine for Hybrid Vehicles" which was published at JSAE academic conference in May 2009.

    The new 1.8L 2ZR-FXE engine is much more efficient than the previous 1.5L 1NZ-FXE engine.

    Both engines trace most efficient area depending on power demand, and the 1.8L engine runs very efficient 220g/kWh area in the most useful medium rpm range.

    Please note that the 1.8L engine's rpm number, for the 40kW output, is lower (3650rpm & within 230g/kWh area) than 1.5L's (4000rpm & out of 230g/kWh area).
    I believe the vehicle cruising speed by 40kW is approx 95mph, and we can see the turning point at 3650rpm to get more torque than efficiency for higher speed.
    It looks Toyota is trying to compete European diesels on 90mph cruising German autobahn. :)

    Enjoy,
    [email protected]

    [​IMG]

    [​IMG]
     
  2. DaveSheremata

    DaveSheremata New Member

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    It's starting to boggle my mind a bit whenever I try to bounce the scalars around! (I'm probably not supposed to do that...

    It looks a lot more efficient across the board - when you count out the circle to the 190g/kWh, the 2010 covers a lot more ground!
     
  3. FireEngineer

    FireEngineer Active Member

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    Ken,

    Thank you and the Japenese Prius community for sharing this with us. Though not as pretty as Bob Wilson's charts.

    Wayne
     
  4. bwilson4web

    bwilson4web 03 and 10 Prius

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    I'm trying to get excel to 'do the right thing' and it is ugly what I have to do. But I am intrigued by 1NZ-FXE chart and what I measured in the field. Hobbit may have some insights to share but I'm finding anything over 2,600 rpm and we start to see a fall off and it is most evident from 3,200 and above. The crash at 4,150 and above is evident in both of our charts. It is the low rpm area that has me scratching my head.

    I'll take the charts home and load them into excel to see if I can provide more rpm scale points. It is the low rpm side that has me curious.

    Do our Japanese Prius friends with NHW20s and NHW11s try to keep their engine rpm in the region of the peak BSFC chart or lower than 2,600 rpm?

    Thanks,
    Bob Wilson
     
  5. jprates

    jprates http://prius-pt.com - Portugal

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    Bob, this seems to show that the improvement from the classic to 3G is well over 5% as you had reported at PTS isn't?

    I hesitated to reply to your post back then, but I did thought it was too low of an improvement to be right.

    On the other hand, one has to consider at which rpm we are talking about, and what load, don't we? Simply stating an x% value is too vague, or at least this is what I feel about it.

    By what Ken as reported, we conclude that at least for 40kW generated output level the efficiency of the new engine is up by 9% compared to 2G.

    Just out of curiosity, do you know what rpm would be needed to generate those same 40kW on the classic?
     
  6. bwilson4web

    bwilson4web 03 and 10 Prius

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    The 2010 is also about 300 lbs, 136 kg., 10% heavier and I did not adjust for the different vehicle weights. I was trying to report the "net" improvement of the vehicle in a hill climb. The engine is superior.
    It looks to be about 4,000 rpm in my NHW11.

    Bob Wilson
     
  7. jprates

    jprates http://prius-pt.com - Portugal

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    Thanks for the clarification Bob.
     
  8. jprates

    jprates http://prius-pt.com - Portugal

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    Ken, can I ask you the favor to ask your friend permission to post these same pics on my Portuguese speaking site Prius-PT.com?
     
  9. usbseawolf2000

    usbseawolf2000 HSD PhD

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    Wow, another thread to bookmark. :)
     
  10. efusco

    efusco Moderator Emeritus
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    It was an instant sticky!
     
  11. usbseawolf2000

    usbseawolf2000 HSD PhD

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    Heck, even 50kW (1.5L's max) is still in the 230g/kWh region. Look at the torque boost at 4k RPM. I wonder if that can be felt like when V-Tec kicks in. :D
     
  12. ken1784

    ken1784 SuperMID designer

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    Hi João,
    He agreed to post them on your site.

    FYI,
    The charts came from Toyota's article titled "Development of New 1.8-Liter Engine for Hybrid Vehicles" which was published at JSAE academic conference in May 2009.
    Maybe, we'll see them on some of the US SAE papers.

    [email protected]
     
  13. ken1784

    ken1784 SuperMID designer

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    Hi Bob,

    Our hypermilers never drive highway (above 42mph). :)
    I believe they rarely see above 2,300rpm on the pulse portion of P&G. ;)

    [email protected]
     
  14. Tideland Prius

    Tideland Prius Moderator of the North
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    wow... that is a "weak" pulse. I'm sure my pulsing isn't below 2,300rpm... uh oh haha. Should I keep it below 2,300rpm?
     
  15. ken1784

    ken1784 SuperMID designer

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    I think it's on you. Drive your Prius on your traffic environment.

    Anyway, following is some data collected by one of Japanese hypermilers driving his training road, 20 mile loop (no altitude change between start and goal points).

    pulse: 20% of total distance, up to 45km/h, 2,000-2,200rpm, 26mpg
    glide: 80% of total distance, down to 35km/h, using N shift gliding :)
    results: 130mpg on his 20mile training road

    [email protected]
     
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  16. FireEngineer

    FireEngineer Active Member

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    And I thought I was a bad driver when my pulses went above 1800 RPM.

    Wayne
     
  17. bwilson4web

    bwilson4web 03 and 10 Prius

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    Got it! Thanks!

    The paper identifier: 2009-01-1061

    Good read although I have some questions.

    Bob Wilson
     
  18. Tideland Prius

    Tideland Prius Moderator of the North
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    mmm ok... yeah I P&G from 60-40km/h (the speed limit is 50km/h). Maybe that's why.
     
  19. jprates

    jprates http://prius-pt.com - Portugal

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    I wonder how people have patience and time do do this. :eek:

    I also wonder how busy that train road is... I bet it is a desert... Driving like that would be a tremendous hazard for traffic, no doubt I would be crucified (rightly so!) by the other drivers on the road!
    [​IMG]
     
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  20. Tideland Prius

    Tideland Prius Moderator of the North
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    depends on the road. I've done 65-45 on a 70km/h road. The only reason why I could do it was because it was just before rush hour so the road is fairly empty and any traffic could use the left lane to overtake me (it's two lanes each way).
     
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