[Diy_efi] Injector duty cycle meter

[bcroe at juno.com]

31 Jan 04 mlschmidt at sprintmail.com writes:
> Does anyone know of any information on making a similar 
> meter for measuring injector duty cycle?

> Mike

If you only want duty cycle, a far simpler approach would 
work on saturated injectors.  Note the drive voltage (like 
12V), then filter the applied voltage into a dc meter (an 
analog might be better, since it will be changing a lot).  
If you get 3V average, your duty cycle is 3/12 = .25, or 
25%.  

A    P + H injector would need a buffer, or take your signal 
from the driver input, best of all.  

I wonder if a dwell meter would work, in reverse (reads 
off time).  Lets try it.

Bruce Roe
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