Camshaft/crankshaft sense

[Edward C. Hernandez]

Kenton A. Hoover wrote:

> A second question is, does anyone sense crankshaft and camshaft 
> positioning separately?  This sounds silly, but it would let one sense
> timing belt/chain failure almost instantly, so one could inhibit plug
> firing which might save some bent valves.  In theory, you could sense
> belt/chain wear, but I don't think you'd want to spend the money on
> that level of precision.

Ford do it this way, ie, a cam sensor for TDC and crank sensor for
engine position.

Ed Hernandez
Ford Motor Company
ehernan3 at ed8719.pto.ford.com