"Peak Efficiency" Control Mode?

General topics and discussions about the VESC and its development.
devin
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Re: "Peak Efficiency" Control Mode?

Postby devin » 30 Oct 2017, 16:51


Addy
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Re: "Peak Efficiency" Control Mode?

Postby Addy » 01 Nov 2017, 16:34


rew
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Re: "Peak Efficiency" Control Mode?

Postby rew » 03 Nov 2017, 08:02

Devin, your calculations/simulations of a while back show your "max efficiency" method reducing the throttle value at certain points in the trip. Thus the guy riding "your algorithm" will be at work later than the guy riding "full trhottle". I propose adding a third virtual rider to the comparison. Mine gets a reduced "full throttle" (i.e. max motor amps) setting, so that in the end he arrives at the next stop sign at the same time as your "max efficiency" rider.

Intuition tells me that he'll use only very little more juice than your rider, or even less.

devin
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Re: "Peak Efficiency" Control Mode?

Postby devin » 03 Nov 2017, 10:20


rew
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Re: "Peak Efficiency" Control Mode?

Postby rew » 11 Nov 2017, 09:38


devin
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Re: "Peak Efficiency" Control Mode?

Postby devin » 11 Nov 2017, 12:54

Last edited by devin on 11 Nov 2017, 13:42, edited 3 times in total.

ThierryGTLTS
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Re: "Peak Efficiency" Control Mode?

Postby ThierryGTLTS » 11 Nov 2017, 13:35

I would be curious to test your algorithm on a real track.

Have a Nice Day.

Thierry

devin
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Re: "Peak Efficiency" Control Mode?

Postby devin » 19 Dec 2017, 18:15

Last edited by devin on 21 Dec 2017, 10:10, edited 1 time in total.

devin
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Re: "Peak Efficiency" Control Mode?

Postby devin » 20 Dec 2017, 04:05


devin
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Re: "Peak Efficiency" Control Mode?

Postby devin » 22 Apr 2018, 16:27

Here's a new comparison between the "classical algorithm" (bldc current control) and hypothetical "efficiency control" @ 100% throttle... notice both boards are capable of 85mph (bottom left chart)... this chart assumes the vesc hardware is modded to allow 300a motor amps, 300a battery amps per motor and max 100% duty cycle.

classical settings: 300a battery amp limit, 300a motor amp limit, 33.2v battery, 850kv 0.0135ohm motor, 120mm tire diamter, 4:1 gear reduction, 2 motors

efficiency control settings: 300a battery amp limit, 300a motor amp limit, 87.5% desired efficiency setting, 200w minimum electrical wattage setting, 9960w maximum electrical wattage setting, 33.2v battery, 850kv 0.0135ohm motor, 120mm tire diamter, 4:1 gear reduction, 2 motors

Image

with efficiency control I observe the electrical to mechanical conversion efficiency is greatly increased while accelerating (green line top left chart) and the ohmic heating is greatly reduced (red line, top middle chart).

ohmic motor heating full throttle at 10mph drops from 1215w to 33.4w per motor...

electrical to mechanical conversion efficiency full throttle at 10mph jumps from 45.2% to 83.2%...

Image


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