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Averaging MAP and MAF for input to controller
I run a liner progressive controller in my car. I was thinking that because I run the stock turbo and need more cooling in the upper RPM range where the turbo blows the hottest air. I could just use the MAF voltage and that would follow RPM closely. But then I though about averaging MAP and MAF. That way I can run more boost through the whole RPM range and have more water when and where it is needed.
Am I insane? Or would this be a good idea? One big problem I can think of is isolation of the MAP and MAF signal lines. TMS |
#2
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I think you are very sensible, the intercooler efficient will also drop as well at high flow promoting more heat.
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Richard L aquamist technical support |
#3
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Do you think I should weight one more than the other?
TMS |
#4
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Quote:
Is it possible to incorporate a temperature sensor to modify the MAF sensor output?
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Richard L aquamist technical support |
#5
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Quote:
I was looking a a microcontroller for this, but then I found a passive circuit to average the voltages. I like to keep thing simple. How would you intergrate the temp sensor? Would you average all three MAP, MAF, and IAT after the IC? If it would be a straight average of the three the passive circuit could be used. |
#6
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Here is a circuit you can rig up yourself for less than 5 dollars.
You need to find a temperture to suit your operating range.
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Richard L aquamist technical support |
#7
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That is the active one that I found. My only concern is that there will be cross talk between the signal lines. I tried to set up the passive version of that circuit today using 2 DC power supplies and a volt meter but the voltage readings did not jive with the average I should be getting.
I am leaning towards using a microcontroller like a STAMP that would allow me to give a weight to each input and would isolate each one from the other signals. TMS |
#8
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Try this one, no cross talk:
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Richard L aquamist technical support |
#9
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That was my next idea. Now I just need a quad opamp. I will see what I have at work tomorrow.
TMS |
#10
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Slight improvement, you can switch off the sensors you don't need.
The LM324 shouldn't cost you more than 20 cent each.
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Richard L aquamist technical support |
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