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Re: Asynch vs Synch Injection
In a message dated 4/20/00 4:26:45 PM Eastern Daylight Time,
jws6367@mailcity.com writes:
> Just to add some confusion, back when I was studing the P4 doc. I thought
> that sync/async refered to how the computer triggered the injectors.
Because
> at idle with the small PW the spray pattern was not great, it went into
> another mode that would skip each cycle, but when it did fire would spray
> twice as much.
>
I was going to keep-a-my-mouth-shut, but that is the way I read it also..
Synchronous=evry revolution, Asych=every-other revolution.
When the pulse width requirement gets too low to reliably meter fuel,
the system has a lower most point at which the pulse with is doubled,
then the injector is fired *every other* revolution, instead of every
revolution.
then, as a result, the <new> pulse width (which occurs half as often)
is still great enough to be reuced even further while still providing
accurate fuel delivery. (in thoery).
Mike V
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