Calculated parameters based on extended parameters?

nsfw · **Joined:** Wed Nov 22, 2006 10:23 pm **Posts:** 2565

From a post in an SD thread:

CarverHouseRally wrote:

What is the difference between an ecuparameter and a parameter? Can you use ecuparameters in calculations?

I tried adding this in the derived parameters section but it did not work.

<parameter id="p204" name="SD Output Error" desc="SD MAF From Sensor minus SD Output.">
<depends>
<ref ecuparam="E1005" />

<ref ecuparam="E1000" />

</depends>
<conversions>
<conversion units="g/s" expr="E1005-E1000" format="0.00" />
</conversions>

I would assume you can't reference ecuparams in parameter calculations

Seems to me that this is a reasonable thing, but apparently it doesn't work...

Is that something that can be fixed without too much effort?

dschultz · **Posted:** Wed Oct 10, 2012 11:08 pm

The parameter section is parsed before the Logger knows what car it is talking to so there will not be any E# parameters to derive from. And most likely they are not updated after the connection.

I'd have to take a look to see how much work is required to add this feature. I know there's a bug in the derived parameter section that will double register a P# item even if it is already selected separately, such as RPM. So maybe these two can be worked in together as an update.

CarverHouseRally · **Joined:** Mon Aug 20, 2012 5:42 pm **Posts:** 27

Thanks for looking into this guys! Using excel provides a decent workaround and I won't need it once my VE table is squared away. Its up to you if you think its worth implementing, might be useful for other functions.

RomRaider

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