PLL on crank angle sensor input

[G.Buckle]

At 10:20 4/03/97 -0700, you wrote:
>I thought of using a PLL to phase lock a higher frequency clock to crank, or
>cam sensor to allow more resolution in developing ignition and fuel timing.
>The problem I see is the very large dynamic range required.   We have
>programmable on chip PLLs that would require software intervention to change
>the feedback as the frequency approaches range boundaries.  me

Perhaps using more pickups might be an answer.

Instead of the 4 mentioned used to clock a PLLed oscillator, why not use
many more sensors or triggers...maybe an optical pickup with a 180 or 360
segmented disk? You could mount the transmitter - receiver side by side and
have a segmented reflective band on the crank..Then you could make up a
counter circuit to give the intervals you need.

That way you would have a fine "clock" of the crank position. Just an idea.....





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