[Diy_efi] Info on how to make crank position sensor circuit?
bcroe at juno.com
bcroe at juno.com
Wed Jun 5 14:05:30 GMT 2002
If I wanted to resolve between teeth, I would keep track of the
time between the last 2 teeth passing. I would divide the time
since the last tooth by the time between 2 teeth to find out how
far past the last tooth I am.
Phase locked loops are a tricky business, esp for widely
varing frequencies. Bruce Roe
On Tue, 04 Jun 2002 14:49:53 -0700 David Gravereaux
<davygrvy at pobox.com> writes:
> bcroe at juno.com wrote:
>
> >Just how much more accuracy than individual flywheel teeth
> >is really useful? Bruce Roe
>
> Whether I infer in hardware (integration in the loop filter
> of the PLL), or infer by time in between teeth, it's the
> same result (hopefully). As I have no idea how to do a
> DPPL, I'll start with a 4046 and a timer used a
> programmable counter and see where it gets me. A
> quarter of a degree
> resolution seems like a good starting point.
>
> If I can get it to pass the strobe test with a gear on a
> drill jacking the rpm all around, i'll be pleased. From
> the archives, someone advised a DPPL to be more
> adjustable with regards to noise rejection because
> all the math is right in front of you.
> David Gravereaux
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