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Old 09-06-2008, 07:28 PM   #11 (permalink)
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I would not use a large sample pool. that was just a reasoning for not doing it. I did not realize that a 'last 1/2 second' solution was in the works. (too large a data set imo, and it seems to me that you would loose data intregrity for the mpg reading.)
I was merely showing an algorithm for screening out single anomylous readings. (Tossing out the signal would be bad, causing dropped counts for total miles.)
Using the min vss pulse for a time frame seems like it would show a little high for the speed if you have a glitch.

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Old 09-06-2008, 07:30 PM   #12 (permalink)
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of course, if we had a trace output of the anomalous pulses it would be easy to determine the easy way to screen them out.
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Old 09-07-2008, 04:32 AM   #13 (permalink)
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Collecting data for a half second is entirely appropriate for display purposes, because that happens to be the display refresh rate. I have not suggested anything that would interfere with the accuracy of the trip accumulators, those are more important than the instant display. And yes, you need a "slop factor", as mentioned, my metro looks like 1.6.

re: traces, Here are a couple pulses (pm'd you the link):
http://ecomodder.com/forum/showthrea...html#post50053

The problem comes in when you want to do something like an accurate coast down test to determine your cda/crr. cda/crr doesn't exist yet, but 1/2 a second resolution is less than ideal for that task, more than one pulse is also less than ideal too, the signal on the metro itself is far from ideal, there's only so much you can do with it.

The nice thing about the "slop theory" and tracking the min and/or max vss pulses per 1/2 second in the interrupt handler is that it is based on a physical limit of the existing system, i.e. the min or max should be mostly those readings where most/all the slop was at it's maximum extents, and thus we have a reference point, sort of
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Old 09-07-2008, 04:15 PM   #14 (permalink)
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The signal is very noisy on first look.

A little filtering would go a long way.

A simple circuit called a "Window Detector" will do this. Waiting for a specific value to turn on, and waiting for a lower value to turn off.
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Old 09-07-2008, 04:17 PM   #15 (permalink)
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Nasa guys huh?

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