hall sensor simple questions

[Bernd Felsche]

Swayze writes:

>> ??. Accuracy (at least in the mechanical sense), is a function of the
>number
>> of references, not number of sensors.  You can do equally well with crank
>or
>> cam, the only time you need both is in SEFI (meaning timing or fuel).  If
>> you want to measure crankshaft accleration rates accurately then you need
>a
>> crank sensor, since there is always "gearing" for the distributor, and
>that
>> alllows for slow, and erratic signaling for that level of resolution,
>> needed.  You can get by with dissy, but the resolution of input, and
>> filtering gets more complex, and hence more room for error.

>so, if using a dissy for the timing pulse, you would still need a TDC
>reference (either missing or extra tooth(notch)  or extra
>sensor(crankshaft?)

No. The position signal from the distributor is sufficient. It can
provide a reliable "TDC" reference.  You can run an engine well on that.

You can run an engine _better_ with higher resolution sensing via
crank/cam position.

-- 
Real Name: Bernd Felsche
    Email: nospam.bernie at perth.DIALix.com.au
     http://www.perth.dialix.com.au/~bernie - Private HP
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