Shutting fuel off whie driving.

[Greg Hermann]

>-----Original Message-----
>From: Greg Hermann <bearbvd at sni.net>
>To: diy_efi at esl.eng.ohio-state.edu <diy_efi at esl.eng.ohio-state.edu>
>Date: Wednesday, March 31, 1999 5:30 PM
>Subject: Re: Shutting fuel off whie driving.
>
>
>>>>Flashing at this rate would not appear as constant.  However, the pulse
>>>>width at idle would be so short that we might not even see it flicker.
>In
>>>>fact, the duty cycle will always be so low (12.5% max on 8 cyl) that the
>>>LED
>>>>will only ever appear dimly lit at best.
>>
>>>When we talk duty cycle on any engine's injectors, is it the percentage of
>>>open time to time between intake events or percentage of open time to
>closed
>>>time regardless of RPM etc...
>>-----------------------------------------------
>>>Reason I ask, is if my V6 is at 5200 RPM (see's it at least once a day!)
>>>then it is running 5200/60/2 43.3 intake cycles per second or intake
>events
>>>every 23.1ms.  With a 23.1ms injector PW, that would be 100% duty cycle
>>>correct?
>>
>>YES--Dave, you are correct with this statement!
>
>Uh, for SEFI, only right?.
>Batch fire 1/2 of that.
>Bruce

OK--but what Steve said is correct! Duty cycle (a %) is = [TIME ON/(TIME ON
+ TIME OFF)] * 100. This applies across MANY knids of things--for instance
lots of welders are rated at a given number of amps of welding current
based on a given duty cycle. The duty cycle % number has not a thing to do
with frequency of on and off!

Regards, Greg