Injector Dynamic Range

[Peter Wales]

At 01:43 PM 3/17/95 EST-11, DIY_EFI at coulomb.eng.ohio-state.edu wrote:
>I have been thinking about some of the issues regarding EFI, and I 
>was wondering if anyone has some ideas about the dynamic range of 
>fuel injectors:  If it is around 48dB (ie. 256:1) 


Thats an unusual approach! 

The answer is that under 1.5 mS opening time the fuel flow is undefinable
and conversely it takes 1.5 mS to shut and during that time the fuel fuel is
undefinable. At 1 mS the injector does not open at all and if the close
pulse is 1 mS or less the injector won't close. The dynamic range depends
upon the PRF or engine speed. An 8 bit counter would work satisfactorily and
most early computers used 8 bits but as 16 bits is almost as easy to get and
use, more is better

Peter