[Diy_efi] wide band O2's

[Gianmarco Rizzo BE/EAS]

Adam

as far as i understand, the WBO2 sensors do indeed outputs an analog signal, but this signal must be processed in order to get rid of the "kink" in the afr curve (it is not linear) and to generate a linear V output. also processing is necessary to control the heater and to correct the sensor output for temperature, and other parameters. i think it is explained much better on the wbo2 website.

my wbo2 also simulates a ego sensor voltage, and all the output Voltage curves can be reprogrammed at will, giving me the chance to use a uego sensor and "trick" the ECU into thinking that there is a EGO sensor installed and run a ego based closed loop ECU to any afr i want, which i think is an interesting feature. remove ego sensor, install uego, collect the NB voltage output to the ecu and program the wbo2 controller to a suitable 0-1V curve to mach the wanted afr.

my particular wbo2 controller can be calibrated in free air. i think the innovate also has this feature.

i reckon all these tasks can be done analogically but it will be probably complex. 

gm
> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org 
> [mailto:diy_efi-bounces at diy-efi.org]On
> Behalf Of Adam Wade
> Sent: Mittwoch, 6. Juli 2005 05:44
> To: diy_efi at diy-efi.org
> Subject: RE: [Diy_efi] wide band O2's
> 
> 
> --- "Daniel R. Nicoson" <A6intruder at myo-p.com> wrote:
> 
> > I don't know what the commercial WB units are like
> > but my DIY-WB has an output that moves very quickly,
> > my TwEECer samples somewhere around 10-15 times each
> > second.  I do a very SIMPLE form of DP in that I
> > graph the data on spreadsheet, the results are
> > represented in a very analog graph.
> 
> > A WB with real DP would have a processor actually
> > following a very mathematical process to give a very
> > usable signal on the fly.
> 
> Are you saying that the signal is significantly
> unstable?  Obviously there will be transients under
> normal operation, as many parameters change fairly
> rapidly when driving a vehicle on the road.
> 
> Just trying to understand why an analog unit would be
> "less accurate" than a digital one (for varying values
> of "digital").
> 
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