"Noisy" tpsDOT

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JasonC SBB
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Re: "Noisy" tpsDOT

Post by JasonC SBB »

Nice. "Cycle average" takes several samples at the same points, per engine cycle and averages them?
jsmcortina
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Re: "Noisy" tpsDOT

Post by jsmcortina »

JasonC SBB wrote:Nice. "Cycle average" takes several samples at the same points, per engine cycle and averages them?
It is an average of many points (at 0.128ms intervals) between ignition events.

This should (and has been shown to) give a repeatable result.

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Peter Florance
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Re: "Noisy" tpsDOT

Post by Peter Florance »

Perhaps we need a new thread for mapDot?

Seems like the tpsDOT problem has been resolved through grounding.
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robs
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Re: "Noisy" tpsDOT

Post by robs »

I agree that this deserves a new topic -- but something more general than MAP sampling. With the MAP averaging improvement, MAP is my cleanest AD input. Even with sanitised grounding, I still see occasional spikes in other inputs which might benefit from smarter sample timing.

That said, I think Jason has set an ambitious task. To get a quiet peek in at each input channel amongst all the mechanical and electrical activity would be quite a trick. If I found that the spikes in MAT (say) could not be adequately dealt with using a low lag factor, my first software approach would be to set a bound -- i.e. that MAT cannot possibly change by more than x degrees between samples, so just continue using the last trusted sample until we get another that can be trusted.

Still, it's nice to see the old thread doing a Lazarus.

Have fun,

Rob.
luftvagon
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Re: "Noisy" tpsDOT

Post by luftvagon »

Cross-posting a bit.. I just replaced my LowZ+resistor pack for HighZ injectors, and now I am getting TPS noise. I dont even have a TPS. My TPS-signal goes directly to ground as recommended .
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