Formula help for Calculated Pid

[vetteboy2k]

What I meant by that is the sensor doesn't care what fuel your using or what % ethanol you have in your fuel, Its always going to read stoich of that particular fuel at 1.0 lambda.

[joecar]

Yes, but what is the BEN for serial LAMBDA?

You could use this (like Mr.Prick suggested): 14.7 / {GM.AFR} * {EXT.WO2LAM1}

Or you could instead log GM.EQIVRATIO and use this: {GM.EQIVRATIO} * {EXT.WO2LAM1}

And I would display WBO2EQ1 = 1 / {EXT.WO2LAM1} on the dash/chart to avoid confusion...

After using EQ units for a while you get used to them, you'll like EQ better than AFR.

[mr.prick]

Personally I use BEN as a reference,
I don't care what the AFR is at the moment as much as I care if it is what it should be.
I don't worry about this anymore.

[vetteboy2k]

Has anyone ever got a FJO wideband to read serial into the V2? I bought a universal cable from taq and hooked up the wires tonight but I get Controller not found.

I swapped Tx and Rx and still the same Controller not found message.

I thought I read somewhere that FJO's serial would not work, yet I see that its supported in the V2 for serial WB02 and Paul said it is supported as well ?

[vetteboy2k]

The FJO serial wide band protocol is supported on FlashScan. Make sure you have the latest firmware. A new firmware version (V2.06.01) will be available soon. It contains some small display fix-ups that may affect the serial data display.

Page 15 of the FJO Installation and User Manual shows a wiring diagram.

Regards
Paul

http://forum.efilive.com/showpost.ph...2&postcount=11

[vetteboy2k]

Measuring the analog voltage not connected = 4.41 and connected = 4.11 therefor the offset 4.11/4.41=.931973 How would I enter that into my calc pid. It keeps coming up as an invalid. Below is the error. How should I have this calculated or written in the calc pid to show properly?

FJO Analog AFR {CALC.AFR_FJO}

Expression:
AFR = ({EXT.AD1} / .931973) * 2.5 + 8.75
is NOT valid because:
Syntax error: ".", position 14.

PID value cannot be determined because
the following error would occur:
Expression not valid: Syntax error: ".", position 14.

***Looks like I got it, it needed a 0 in front of the decimal AFR = ({EXT.AD1} / 0.931973) * 2.5 + 8.75

[mr.prick]

You may want to calibrate your AD's or at least check them,
you shouldn't need to add an offset for the V2.

[whackem04]

can somebody make a sticky about how to edit the Calcuated.Pids the right way and how to write formulas.
thanks

[joecar]

can somebody make a sticky about how to edit the Calcuated.Pids the right way and how to write formulas.
thanks

Calculated PIDs:
showthread.php?t=132
showthread.php?t=130
showthread.php?t=10

[Arash]

Measuring the analog voltage not connected = 4.41 and connected = 4.11 therefor the offset 4.11/4.41=.931973 How would I enter that into my calc pid. It keeps coming up as an invalid. Below is the error. How should I have this calculated or written in the calc pid to show properly?

FJO Analog AFR {CALC.AFR_FJO}

Expression:
AFR = ({EXT.AD1} / .931973) * 2.5 + 8.75
is NOT valid because:
Syntax error: ".", position 14.

PID value cannot be determined because
the following error would occur:
Expression not valid: Syntax error: ".", position 14.

***Looks like I got it, it needed a 0 in front of the decimal AFR = ({EXT.AD1} / 0.931973) * 2.5 + 8.75

Based on the formula för a liear equation (y = kx + n), in this case, I would use "n" to adjust for any offset.

So the equation in your case would translate into:

y = lambda
k = line slope
x = voltage
n = vertical offset = the point at the y-axis where the line crosses it

So by adjusting the n-number, you could offset the whole line up or down.

If you have an analog voltage number from the manufacturer for e.g. not connected/connected, I would just compare it with your current reading and insert that offset on to the n-value that was current for you base line lambda calibration.

Is that making any sense?