In article ,
NY wrote:
I'm not sure how fuel injection works. Obviously you can vary the amount
of fuel admitted by varying the length of time that an injector valve
is open, but is any attempt made to vary the pressure and therefore the
fuel flow rate, to avoid having to inject for longer to get more fuel
in, as opposed to keeping a more constant injection period but varying
the flow rate?

Not absolutely certain of all the latest techniques, but at one time fuel
pressure to the injectors was compensated for against 'suck' with high
cylinder vacuum by having the pressure regulator referenced to vacuum. So
it dropped the pressure under high vacuum conditions.

In other words the amount of fuel injected was basically controlled by the
length of time the injector was open. This being the common way with port
injection petrol engines.

--
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Dave Plowman London SW
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