Power mode DMD and DMI

Discussion in 'Prime Main Forum (2017-Current)' started by Henrik Helmers, Jul 4, 2020.

  1. Henrik Helmers

    Henrik Helmers New Member

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    I found a Toyota page online where it says:

    Power mode gives a higher throttle response to accelerator pedal inputs, boosting power to improve acceleration and increase driving pleasure. Once in Power mode the car also engages a new DMD (Driver’s Mind Logic) drive assist system to provide more responsive performance. DMD uses a Driver Monitoring Index (DMI) system which continuously monitors vehicle G-forces to understand driver behaviour and habits. Thus it will recognise a desire for sportier performance, adjusting engine braking and throttle response accordingly.​

    I know about throttle remapping, and after reading on these forums it seems the consensus is that it is all that is taking place. Does anyone know what the Driver’s Mind Logic and Driver Monitoring Index are? Any experiences with this? It sounds like fun on paper. :)
     
  2. m8547

    m8547 Senior Member

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    I think it's a fancy way of saying, the car looks for patterns in you driving habits. It's been done for a while, and particularly noticeable in cars with a regular automatic transmission. If you call for an above average amount of acceleration a few times, the transmission will be quicker to downshift after that. If you're driving for maximum efficiency, it will stay in higher gears longer.

    I think it's related to the transmission's ability to automatically downshift on long downhills and to hold lower gears longer when climbing long hills or towing a trailer.

    I haven't noticed any clear changes in the Prime based on how I drive (which varies greatly depending on if I have EV range to spare or if I'm trying to stretch it). The only thing I've noticed is, it I'm accelerating onto the highway, the car seems to "help" and continue accelerating more quickly as I get up to highway speed, than the accelerator position would call for.

    It's a little hard to explain in words. But normally at higher speeds the accelerator pedal needs to be pressed more, because there is more drag. If the accelerator pedal was exactly linearly mapped to engine power, if you held a constant accelerator position the rate of acceleration would slow down as you approach highway speed. But the Prime seems to notice that I start accelerating quicker and longer than usual when I'm about to merge into the highway, and as speed increases it seems to increase the power output to maintain a constant rate of acceleration.

    The result is, if I start out accelerating briskly, but maintain a constant accelerator pedal position, by the time I'm at highway speed the power indicated on the hybrid system indicator is almost all the way to the maximum (it won't cross the PWR line in EV mode)

    Or it could all be in my head (or foot). Also, I use eco mode 100% of the time, so I haven't experienced the "new" DMD in power mode. I assume there is also a DMD program active in eco mode with different parameters.
     
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  3. bisco

    bisco cookie crumbler

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    power of suggestion?
     
  4. Tideland Prius

    Tideland Prius Moderator of the North
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    This means we have to keep it in PWR mode for the entire drive lol. Most users here will be in normal or ECO mode. I have read about it in the Japanese press release (in English) for the regular 4th gen Prius but I haven't actually tried it myself.
     
  5. Henrik Helmers

    Henrik Helmers New Member

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    It would be interesting to see data from the DMI. Maybe that's what is used for the eco score?
     
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