DDL (was: DIY-GOR ideas)

[Bernd Felsche]

944Technologist tapped away at the keyboard with:
> > Not everyone feels comfortable with analog electronics, at least I don't!
> > That is why I want to go digital imediately.

> > Jorgen

> A digital EGOR will work better than an analog EGOR? No! Never
> happen. It will just cost more.

You've made two unsubstantiable suppositions.

> If you feel the need to add hundreds of dollars to the design and
> hundreds of hours of your time to the design go ahead. When you

The cost point for the components on the PCB is about US$20.

> are done, it won't work any better than a purely analog design
> does. It won't change the fact that it is an analog sensor and
> requires analog buffers to make it work.  Adding digital controls

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?

> because you don't understand analog makes no sense and you don't
> have a chance to make anything work. You are still going to have
> to learn some analog in order to modify someone else's analog
> design to make it digital.

DDL isn't a derivation of DIY EGOR. It's a "blank slate" design from
first principles.

> When you are done with  the digital version, all you can say is
> you "understand it better". It is not going to work any
> better....... So why bother.

DDL is capable of measuring and controlling the cell temperatures,
not just the heater's. That ensures firstly that the measurement
cell is operating at a temperature above the exhaust gas sample's
(measured via pump-cell temperature) for improved accuracy; and that
the heater is driven accordingly.

-- 
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