Logging Air/Fuel ratio (Lambda)

[TCR]

Can I log an air/fuel ratio (Lambda) with a DL1 data logger?

Paul.

[RTUSA]

Absolutely, yes.

We sell a compatible wide band sensor / controller, or you can use any system. You just need to feed the DL1 a 0-12V signal on one of the analog channels. There is a preset calibration for our sensor, or you can obtain the calibration curve from another manufacturer.

Our sensor actually has two outputs - one is a linear 0-10V wideband output for logging. The other is a narrow band emulation to feed into an existing ECU that is expecting a narrow band response curve.

Regards,

[idol]

Absolutely, yes.
... There is a preset calibration for our sensor, or you can obtain the calibration curve from another manufacturer.

....

Where can I find the preset calibration?

[RTUSA]

Oops, my mistake.

If it were there, it would be under Data > Variable Manager > External Inputs > Sensor Type / Units > Standard (under the pulldown). Many, but not all, of the sensors we sell have the calibration already entered there, but not the wideband O2.

Another thing for the to do list!

[targa tom]

Can I log an air/fuel ratio (Lambda) with a DL1 data logger?

Paul.

If it is linear Paul, no dramas. AFR=(V*2)+9 when your scaling is 0~5 and 9-19AFR. If your ECU requires different scaling, and you wish your log to be comparable, then try this. Take the difference between your AFR limits, and divide by 5 for your factror. ie AFR range 10-30. 0~5v Diff = 20/5=4 equation is the AFR = (V*4)+10. 10 being the lower end of scale

No garantee, but this is what I am doing in tandem with Autronic ECU

TT

[Ground Loop]

For the Innovate LC-1, set the Lambda to be 0.5 = 0v and 1.5 = 5v.
0.5 + (X / 5)

Then the math becomes pretty simple, and you take advantage of the whole 5v input range for maximum resolution. Air/Fuel for gasoline:

VAR_29 * 14.7

It's working great here.

[scorpia]

okay - im new to this variable equations thing - im guessing i put the equation in data/variable manager/sensor type/units: ?


i've put the '0.5+(X/5) in there and the numbers look meaningful - how do i go about changing this to read AFR so it looks the same as what I see on my AFR gauge, and on the workshop machine?

cheers