Prius e-CVT in action: A view of gas engine RPM at 65 MPH

Discussion in 'Gen 2 Prius Technical Discussion' started by usbseawolf2000, Feb 26, 2007.

  1. usbseawolf2000

    usbseawolf2000 HSD PhD

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    How does Prius achieve great mileage (about 50 MPG) on the highway? What RPM does the ICE run at?

    To answer those questions for owners and non-owners, I hooked up my Palm M130 with Auterra Dyna Scan to the ODBII connector. I set the cruise control at 65 MPH and watch the RPM. Gas Engine RPM is the second number from top. The top most number is the coolant temp in deg F. Sorry about the quality on the Palm screen. The camera lacks optical zoom feature during video mode.

    The RPM ranges from 1,200 RPM to 3,000 RPM depending on the slope of the highway. If I put it into warp stealth (arrow from battery to wheel only - not shown in this video), the RPM drops to around 980 RPM.

    What is really cool about HSD e-CVT is that, the RPM just change while maintaining at 65 mph. The only change is the power load due to the gradient of the highway. Enjoy!

    http://video.google.com/videoplay?docid=3834454834833982503

    Dennis
     
    #1 usbseawolf2000, Feb 26, 2007
  2. D0li0

    D0li0 New Member

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    Similar, here are some logs from some PHEV trips using the CAN-View, I've plotted a few of them:
    * http://www.eaa-phev.org/wiki/PiPrius#Logs

    Here's one of the plots, you can see the Tach as the blue line;
    You can see a few extended "warp stealth" instances, which I've labeled.
    * http://www.eaa-phev.org/wiki/Image:Capture0060.png
    Most of the other items listed here are electrical, but you can get the whole
    .zip of the spreadsheet with many more of the items which were logged.

    L8r
    Ryan
     
    #2 D0li0, Feb 26, 2007
  3. usbseawolf2000

    usbseawolf2000 HSD PhD

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    Nice graphs. I assume those were capture with extra battery pack? I don't see coolant temp in the graph.

    My coolant temp went as high as 199 deg F with blocked grills and outside temp was 30's deg F.

    Dennis
     
    #3 usbseawolf2000, Feb 27, 2007
  4. DougSlug

    DougSlug Member

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    Thanks for introducing me to the Auterra Dyno Scan tool with your video. I checked out their web page. Does the 2006 Prius require the (more expensive) CAN version? Does this system work well? I am seriously considering purchasing one to use with the Palm m500 that's been lying around unused.

    Thanks in advance for your feedback.

    - Doug
     
    #4 DougSlug, Mar 1, 2007
  5. usbseawolf2000

    usbseawolf2000 HSD PhD

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    <div class='quotetop'>QUOTE(DougSlug @ Mar 1 2007, 08:32 PM) [snapback]398797[/snapback]</div>
    Auterra Dyno Scan (just realized I've been spelling it wrong with "dyna") works pretty well with Prius. It can monitor ICE RPM, Coolant temp, Lead Acid voltage, In-take air temp and many other traditional car components. I have the version with CAN but I am unable to get the Hybrid specific components. I can't read HV battery SOC, HV Voltage, HV Amp, etc...

    I bought it to monitor fuel economy for my previous car (Celica 2000). I picked Auterra over AutoEnginuity product because AE does not have MPG feature. I emailed AE and they said they didn't plan on including the MPG feature in the future.

    Now that I own Prius, oh boy... do I regret my decision! AutoEnginuity updates their software more often and supports Toyota hybrid component. Just read and compare their software release notes. If I were you, I would get the AutoEnginuity product because the features are better for Prius. Auterra works as advertise and the screen refresh rate (update speed) is pretty fast. I have no experience with AE. I have a little trouble with the connector to the Palm. It does not seat well with my M130. If the Palm doesn't connect, I have to wiggle the connector.

    Darn... only if Auterra update their software to support Toyota Hybrid components....

    Dennis
     
    #5 usbseawolf2000, Mar 1, 2007
  6. Tideland Prius

    Tideland Prius Moderator of the North
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    wow, sweet video!

    Most cars are closer to 2,500 at 65mph aren't they?
     
    #6 Tideland Prius, Mar 2, 2007
  7. Trevor

    Trevor Member

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    Nice work. I recently got a bluetooth OBD II module, but I haven't been able to get the pocketpc software to function correctly yet.
     
    #7 Trevor, Mar 2, 2007
  8. DougSlug

    DougSlug Member

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    <div class='quotetop'>QUOTE(usbseawolf2000 @ Mar 1 2007, 09:09 PM) [snapback]398812[/snapback]</div>
    I really appreciate this feedback. My interest was definitely in the hybrid-specific components. As you said, I didn't see MPG monitoring on the web page, but the car displays that already, so it seems less important. The AE list of supported sensors is quite impressive. Unfortunately, to get the full-blown Toyota package it costs $400! I'm definitely going to consider the AE product. Maybe I'll wait to see how much of the 2006 tax credit I can actually take before I peel all that lettuce.

    - Doug
     
    #8 DougSlug, Mar 2, 2007
  9. hobbit

    hobbit Senior Member

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    What you're not seeing that is a beautiful part of the picture is
    engine *torque*. Which is almost dead-flat constant across the band
    from 1300 RPM on up, with minor variance as you go way higher.
    _ http://techno-fandom.org/~hobbit/cars/sweet/
    AE can now read the "actual engine torque" PID in enhanced mode,
    which is kind of instructive, but then again I really like my
    ol' vacuum gauge because it's instant feedback and can't lie.
    .
    _H*
     
    #9 hobbit, Mar 3, 2007
  10. usbseawolf2000

    usbseawolf2000 HSD PhD

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    #10 usbseawolf2000, Mar 4, 2007
  11. usbseawolf2000

    usbseawolf2000 HSD PhD

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    <div class='quotetop'>QUOTE(hobbit @ Mar 3 2007, 01:21 AM) [snapback]399418[/snapback]</div>
    I can confirm your theory. A few moths after getting the Prius, I tried to achieve highest highway mileage by backing off the accelerator pedal and slowly pushing back so I stay at the speed I desired. The best I got was 54 MPG for that tank with 90% highway mileage. I found driving this way was very boring and took plenty of patience. The improvement was about 10% and I thought the trade off wasn't worth it.
     
    #11 usbseawolf2000, Mar 4, 2007
  12. Tideland Prius

    Tideland Prius Moderator of the North
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    #12 Tideland Prius, Mar 4, 2007
  13. Rest

    Rest Active Member

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    If only I could get that software to work with my PSP.
     
    #13 Rest, Mar 5, 2007
  14. cireecnop1

    cireecnop1 New Member

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    That video was cool! nice RPM's for the Prius

    my old dumb car with a 6speed ran at 3000-3500 rpm's at 60-70mph.
     
    #14 cireecnop1, Mar 5, 2007
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