Re: Automatic Weighing dosing control?

Well it aint rocket science. Working in percentages of the total weight is
very dumb. If the important stuff happens in the last half kilo having
filled 1, 10 or 1000 kilos previously makes sod all difference.

The important thing is the fill rate and how long it takes to switch to a
lower fill rate (including 0) and how much is in flight at whatever fill
rate.

If you are really writing software to control the machine then just make a
guess at how much is in flight when you cut off the slow speed fill - you
will know how far out you were after the first fill so you can improve your
guess and carry on modifying your guess to compensate for variation in the
machine and product.

For the high speed fill guess the same erring on the short side then use
the duration of the low speed fill to adjust your guess. Aim for minimum
duration of the low speed fill which is long enough to correct the worst
variation in the high speed fill.

I did systems like this 30 years ago without any software.  A big auger did
the bulk fill counting auger turns, the container then indexed to a small
top up auger and load cell. The operator manually set the cut off weight
for the top up fill. A timer was triggered with the top up fill. If the top
up fill finished before the timer the bulk fill count was nudged down, if
it finished after the timer it was nudged up. The operator tweaked the
timer downwards to optimise speed while ensuring at least a bit of top up
always occurred.

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