[Diy_efi] DIY-WBO2 circuit improvement suggestion (Greg Hermann)

[Chad Clendening]

I PWM'ed a UEGO heater once, the thing started making noise.
Noise = vibration, I figured ceramic and vibration probably don't mix.

I didn't try adding an inductor in the circuit, that would keep the current continuous.

The real issue gets down to how much heat / voltage is actually needed when connected to a running enigne?  If it is simply a lower voltage, then the voltage limit could be reduced to the appropriate level.  However,I found with less
voltage applied, the ip cell woudn't pump enough to stabilize the vs cell at 0.45 v in free air.  On the bench you don't have 1000 deg air warming the sensor up and may need additional power in the heater.  If the voltage limit is not
desired, it should be quite simple to remove the voltage limitations and just use the current regulation portion.


Chad






> Message: 6
> Date: Wed, 19 Jun 2002 07:26:40 -0700
> To: diy_efi at diy-efi.org
> From: bearbvd at mindspring.com (Greg Hermann)
> Subject: Re: [Diy_efi] DIY-WBO2 circuit improvement suggestion
> Reply-To: diy_efi at diy-efi.org
>
>  The 24v could then be dropped and
> >regulated and smoothed/"un-noised" to whatever the heater requires. May not
> >be very power-efficient, and might not be the cheapest (you could design
> >your own convertor for example), but it'd be "simple", "brutal", but
> >"effective". doh - sounding like a Land-Rover again! ;-)
>
> I didn't realize that step-up converters had axles of the same consistency
> as used Tootsie Roll !
>
> :-)
>
> Greg
> >
> >Marko
>


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