Missing teeth
Dave Johnson
dajohnson at dek.com
Thu Jun 27 08:04:15 GMT 1996
Is there anyone out there that can answer a question for me?
A lot of ECUs sense engine speed by measuring the time between pulses from a
toothed wheel on the crankshaft, fair enough, I understand that. But, to get
engine position they use a missing tooth to provide a datum mark.
What I want to know is how exactly do thay know when they are at that datum
mark? For instance, when first starting the engine do they compare the time
between pulses and when they get a much larger time compared to previous
ones they think oh I'm at the datum! I just can't quite get my head around
it at the moment.
It's probably quite staight forward and logical but I can't see it.
Thanks in advance,
Dave Johnson
email:- dajohnson at dek.com
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