Re: Asynch vs Synch Injection

["nacelp" <nacelp@bright.net>]

Sync   normal fueling
Async extra fueling
Quasisync lean fueling
Grumpy

> > 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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