Pulsed injectors on/off times

[Brett Dikeman]

At 9:19 PM -0500 2/11/01, Ameer Antar wrote:


>  If it's too big, the injector might be so large that it can't turn 
>on for a short enough time to run the engine at idle, by flooding it 
>w/ too much fuel.

This usually isn't a problem if the car is equipped with a varying 
fuel pressure regulator; for example, the 200q20v regulator "matches" 
rail pressure with manifold pressure(not directly; fuel pressure is 
always at least 1bar above manifold.)  For example, at idle, the fuel 
rail pressure will be much lower than full throttle with 1.8bar in 
the manifold.  Best of both worlds.


>  So what's the standard figure for minimum injector output...5-10%? 
>Or can injectors be shut off completely by the ECU

Yes, they frequently are, during deceleration(driver's foot 
completely off the accelerator and hence idle switch closed.)  This 
is also true on CIS cars.

Brett
-- 
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Brett Dikeman				Systems Engineer
ProAct Technologies Corporation		914-872-8043
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