[Diy_efi] DIY-WBO2 circuit improvement suggestion

[Bernd Felsche]

md4etal tapped away at the keyboard with:

> piezoelectric effect???

If the heater's driven by PWM, that's electrically nowhere near a
piezo element.

If the vibration is severe enough, you may however be able to detect
it at the sensor's other terminals.

> ----- Original Message -----
> From: "Chad Clendening" <clendenc at execpc.com>

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

May have been exciting it near a resonant frequency. If the heater
is a winding (as I presume it is), then the possibility of
induced magnetic effects can result in vibration of the sensor's
outer shell. i.e. it becomes a "speaker"

Vibration and shock specifications are available for some of the
Bosch sensors. The exhaust manifold isn't exactly vibration-free.

-- 
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