Ign Advance on MR-2

[Rich M]

> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of Les Newell
> Sent: 12 August 2001 11:28
> To: diy_efi at diy-efi.org
> Subject: Re: Ign Advance on MR-2
>
>
>The only way to make sense of these messy signals is to detect
> the zero crossings as they will always be at the leading and
> trailing edges
> of the tooth.

All reluctor systems will indeed detect the zero crossing of the voltage
signal - but just as a point of fact, the zero crossing of voltage output
will always be in the centre of the tooth, which corresponds to zero rate of
change of flux in the reluctor coil while the target is right in front of
the sensor.
The voltage output is generated in response to a rate of change of flux in
the reluctor coil.
The voltage will swing one way as the target approaches (as the flux  starts
changing), it will reach a peak at the edge of the tooth and start reducing,
reaching zero as the target covers the sensor. The opposite polarity voltage
occurs in the same way as the target leaves proximity to the sensor. Once
the target leaves the face of the sensor, the voltage again returns to zero
as there is no rate of change of flux in the reluctor coil.

Cheers
Rich


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