DIY_EFI Digest V5 #397

[kb4mxo]

>

This DDL pwming  a constant current source should work but some  analog circuits
are needed. I have seen some resistance change in ion pump as temps go up. I have
not used a controlled oven to verify this or the amount resistance change per
degree C at this point in time so this may not be totally true.  I would think
building a unit and playing with the sensor and learning  it's quirks is a first
step on this project like this.

Steve


> Date: Thu, 23 Nov 2000 22:29:23 -0800
> From: "944Technologist" <f_wilk at hotmail.com>
> Subject: Re: DDL (was: DIY-GOR ideas)
>
> From: "Bernd Felsche" <bernie at innovative.iinet.net.au>
> > Where is the data to support that those sensors can't be driven
> > pulse-mode? Is there a published paper/patent on the effect of
> > ion-diffusion in pump cells somewhere which examines the effect?
>
> Sorry Bernd....... Pulse width modulation is an analog process. Not digital.
> Hanging digital controls on another analog process does not make it a
> digital process.
>
> Good luck with your design. For your information, it is impossible to
> measure voltage, resistance and current with a computer. You need precision
> resistors, constant current sources, op amps, and analog to digital
> conversion (A/D). You will need a shit load of A/D and D/A converters to
> make this work. When it is done, you will still have a computer interfaced
> to a whole lot of analog circuitry. If you can design this without a single
> op amp or a single A/D converter, I will be the first to say I was wrong.
>
> FR Wilk
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