Starter Tooth Sensor Question

[Carter Shore]

The number of teeth vs the number of cylinders need
not be a limitation. There are at least two ways to
go:

1) Hardware: use a Phase Locked Loop to generate the
pulses that correspond to the individual cylinders.

2) Software: use the ECU, or a dedicated PIC, to
derive the cylinder timing from the tooth and TDC
signals. The number teeth and the number of cylinders
are known. Tracking elapsed time from tooth to tooth
allows you to determine accelleration, so that any
interpolation between tooth signals can be as accurate
as possible.

Of the two, the software method would probably be the
most accurate. 

It's also posible with ECU or PIC, to create a virtual
PLL, using programmable timers in place of the VCO.
This allows you to implement some sophisticated loop
filter strategies that overcome the limitations of a
purely hardware PLL, settling time, loop stability,
damping factors, etc.

Carter Shore

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