dumping invalid data - maths channels

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dr_jones
Posts: 162
Joined: Wed Jun 08, 2016 3:24 pm

dumping invalid data - maths channels

Post by dr_jones »

So sort of following up from my previous posts in relationship to base fuel mapping I'm now looking more seriously into interpreting logged data.

It's been mentioned by a few folks that it's a good idea to dump invalid data - in my example I'm only wanting to see lam1 when the throttle opening is changing at a low rate - it seems simple enough:

-I take the derivative of tps:

derivative(tps1)

-and apply to the lam1 data:

if(der_tps<10&&der_tps>-10,lam1,0)

This seems to roughly work - with one problem - where the lam1 reading is to be dumped I have to return a '0' value - I'd much rather return a null value and not plot at all - so far I've not found a way of achieving this - is there a way / is there a better approach.

Cheers,

-Ed.
RICE RACING
Posts: 448
Joined: Mon Feb 24, 2014 1:08 am

Re: dumping invalid data - maths channels

Post by RICE RACING »

This one works for me ;)
but the term you want is 'undefined()

if("derivative engine speed">0 & "derivative engine speed" <3000 & "derivative tps" < 25
& "derivative tps" > -15 & "derivative speed" > -1.5
& "derivative speed" < 50
& trqFuelSev<0.5 & tcSpinErr < tcSpinTarg,lam1,undefined())

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dr_jones
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Re: dumping invalid data - maths channels

Post by dr_jones »

Fab! Thanks!!!
RICE RACING
Posts: 448
Joined: Mon Feb 24, 2014 1:08 am

Re: dumping invalid data - maths channels

Post by RICE RACING »

dr_jones wrote:Fab! Thanks!!!
Not Sure if you have this already? http://www.liferacing.com/wp-content/do ... -08-12.pdf
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Read all that and you should be right, as Dr Lexus says......
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Learning all this can seem too much at first but after the major upgrayedd you will be feeling the love, opening up a whole new world to you.
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https://www.youtube.com/riceracingdonmega
Real turbo road cars fast > reliable > durable
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dr_jones
Posts: 162
Joined: Wed Jun 08, 2016 3:24 pm

Re: dumping invalid data - maths channels

Post by dr_jones »

LOL - and no I did not - thanks again!
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