Eco score - blue line disappears

Discussion in 'Prime Fuel Economy & EV Range' started by benagi, Oct 18, 2019.

  1. benagi

    benagi Active Member

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    Anyone else seeing this? When driving in EV mode at a steady 30 mph after leaving a stop sign or light, the blue line disappears for about 5 to 10 seconds. My eco score was 99, then when the blue just all of sudden disappears, the score tanked quickly. Anyway to keep the blue line visible while trying to get the best out of your Eco score ?
     
  2. DavidA

    DavidA Prius owner since July 2009

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    A photo would help.
     
  3. benagi

    benagi Active Member

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    We’ll see if I can get a photo tomorrow.
     
  4. meeder

    meeder Member

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    Did you activate the cruise control? When the cruise control is on the blue line disappears as well.
     
  5. benagi

    benagi Active Member

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    Not using cruise control.
     
  6. Tideland Prius

    Tideland Prius Moderator of the North
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    B mode or PWR mode?
     
  7. jerrymildred

    jerrymildred Senior Member

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    I might be mixed up because I haven't paid specific attention to it, but it seems like my blue line disappears once I hit a steady speed.
     
  8. Salamander_King

    Salamander_King Senior Member

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    Are you talking about the "ECO Accelerator Guidance" bar in HSI (arrow in the pic)?

    eco accelerator guidance.png
     
    #8 Salamander_King, Oct 23, 2019
    Last edited: Oct 23, 2019
  9. benagi

    benagi Active Member

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    Yes. When that line disappears, I can go from a 99 to a 60 on the eco score in less than 5 secs. How do I prevent that?
     
  10. Salamander_King

    Salamander_King Senior Member

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    I don't usually keep HSI on my MID, but this morning I have kept it and observed the following facts. The "ECO Accelerator Guidance" bar disappears when you come to a complete stop and reset the Eco Score. After starting the car it reappears. However, if you are not on an incline (uphill) or no longer accelerating, it seems to decrease. And if you are decelerating or come to a decline (downhill), the blue bar disappears as the car goes into regen. Somehow I feel that is not what you are describing in your situation, or is it???

    HSI.png
     
    #10 Salamander_King, Oct 24, 2019
    Last edited: Oct 24, 2019
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  11. jerrymildred

    jerrymildred Senior Member

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    I stand corrected. I paid attention yesterday and the only times the blue line went away were when I set the cruise control or under the conditions @Salamander_King just noted.
     
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  12. benagi

    benagi Active Member

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    Finally got a good photo of what was happening. 448D0C48-3862-4218-8768-30FE23AF072E.jpeg
     
    #12 benagi, Oct 25, 2019
    Last edited: Oct 25, 2019
  13. vvillovv

    vvillovv Active Member

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    I'm not sure I'll be able to write this up so it makes sense to anyone other than me, but I've been noticing it in the Prime and other computerized controls and graphs and stats.
    Many times programs will take averages and display them. We all get that part. But how the programs are written is more often than not, not the same or standardized. So how the averages are computed varies widely. The gauges in the prime do this too and most of the time it's so subtle it's unnoticeable. Other times like in your case (at least in my mind anyways) it's noticeable and very confusing.
    And I'm not saying I know for a fact that that is whats happening, I'm throwing it out there to see if it makes sense to anyone else and possibly reduces some of the confusion with how the prime calculates all the sensor data it processes.
     
  14. Tideland Prius

    Tideland Prius Moderator of the North
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    Looks like you’re heading downhill?
     
  15. benagi

    benagi Active Member

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    Flat Road with my foot on the Excelerator holding 32 miles an hour
     
  16. Tideland Prius

    Tideland Prius Moderator of the North
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    Was the Eco accelerator guide there before you got to 32mph? I’m wondering if the car thinks you’re able to glide so it reduces the EAG line.
     
  17. benagi

    benagi Active Member

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    Yes. What I did was the following:
    Start from a dead stop, accelerate to 30 mph (score 99 on accelerate), then let off (score 99) then try to hold a steady speed of 30 mph (blue line still in background) less than a minute later the blue instantly disappears and doesn’t return again for another 5 sec. or so. If I leave my foot on the gas during that time my score goes from 99 to 50 or less in those 5 sec’s. Some times, I let off the gas right away and wait for the blue line to come back, so I can get my scare back up. Of course I don’t try that with traffic behind me, because I would be going less than the speed limit.
     
  18. vvillovv

    vvillovv Active Member

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    Does it only happen at 30 mph?
    If there is no traffic to deal with have you tried the same at 25 mph and/or 35 mph etc?
     
  19. Salamander_King

    Salamander_King Senior Member

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    I think I have observed similar behavior on my PRIME but can't say at what speed and if I was on a level road. I thought it was the way for the car to indicate I should "coast" rather than keeping the foot on the pedal as @Tideland Prius mentioned, but I don't know for sure. I lost interest in Eco Score after doing a small sampling and discovered that the higher eco score displayed at the end of each trip does not always correspond with a higher average mpg. I did this under HV only for if I did it under EV, the mpg would be 199.9 no matter what the Eco Score was. I have not tried correlating the Eco Score with EV range, but my feeling is it also has no strong positive correlation.
     
  20. benagi

    benagi Active Member

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    I know it’s happened at any speeds 40 or under. Don’t know for sure at higher speeds.
     
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