PWM injector driver

[Brian Michalk]

Thanks for the excellent overview.

I have another question.

For regular EFI:

The Bosch books I have states that the injectors fire once per
crank revolution, therefore twice per power stroke.

Does the injector require synchronization with the crank?  It seems
like it would be much easier to just set up at a certain frequency
and then modulate the duty cycle.

I understand that at low RPMs, the injector might be to slow to 
open for a very short duration, and it would cause the engine to run
rich, so at low RPMs, keep the duty cycle fixed, and vary the 
frequency.  At higher RPMs, go up to a certain frequency, and then 
modulate the squirt time with duty cycle.

So my question is: do I really need a crank signal to synchronize
TDC with my injector firing?

 Brian Michalk  <http://www.awpi.com/michalk>
Life is what you make of it ... never wish you had done something.
Aviator, experimental aircraft builder, motorcyclist, SCUBA diver
musician, home-brewer, entrepreneur and SINGLE!
 

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