[ar5boosted]

Originally Posted by Stacygifford

I have had idea floating around for a while.
Im not sure if there has been a thread on it....
The thought is to have an arduino as the output to simulate an oxygen sensor using a few input parameters. (rpm via the injector and TPS via the factory sensor 0-5v)

My wideband has a linar voltage output of 0-5v for a 7.4-22.1 AFR value.
V=(50/147x)- 370/147) x being AFR

or .5-1.5λ or V=5λ-5/2
lambda is much easier lol

My thinking is if the rpm is below 1200 or above 3500 lean burn is not really needed so have the o2 sensor output equal to the factory switching point of 14.7:1

In regards to the throttle position
If <5% run at the normal afr.
If 5-11% run the switching-point at 17.5:1 afr
If12-20% run the switching-point at 16.5 afr
if 21-30% run the switching-point at 15.5 afr
If>30% run the switching-point at the normal 14.7 to help avoid detonation
(possibly wright a formula to make it more linear as apposes to having 3 steps)

Obviously these ranges will need to be adjusted with further testing.

Just an idea I'm throwing out there. I just ordered my Mega 2560 and should be in pretty soon.

If anyone has any ideas/suggestions feel free to comment.

I believe the standard O2 sensors generate a sine-wave.

You'll need a DAC or the ghetto-DAC (PWM+Resistor+DAC) to get a sine-wave off and arduino if I understand correctly.

I'm really interested in having the same thing. As now I want to achieve something similar as well. I know that wideband-o2 sensor -> narrowband-o2-sensors convertors can be bought off-the-shelf for hundreds of dollars but where's the fun in that.

Nice work.