Maxium injector duty cycle - OBD-2 software
11-18-2003, 02:48 PM
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EFILive V6 has this calculation built in, too.
But you have to select the pulse width param
to be logged, and you're probably best off
doing the calc afterward to free up resources
if your computer is slow.
But you have to select the pulse width param
to be logged, and you're probably best off
doing the calc afterward to free up resources
if your computer is slow.
11-18-2003, 09:15 PM
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Duty cycle %= inj.PW(mS)/(RPM/30000)
This is electrical duty cycle - remember your actual mechanical open time will be shorter. General target is not to exceed 80% DC Jason
this is from a guy at www.mototron.com i think he knows what's up. check this out too http://www.ecanfix.com/~mdhamilton/dutycycle1.html
This is electrical duty cycle - remember your actual mechanical open time will be shorter. General target is not to exceed 80% DC Jason
this is from a guy at www.mototron.com i think he knows what's up. check this out too http://www.ecanfix.com/~mdhamilton/dutycycle1.html
11-18-2003, 10:06 PM
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Originally Posted by Texas Terminator
Duty cycle %= inj.PW(mS)/(RPM/30000)
This is electrical duty cycle - remember your actual mechanical open time will be shorter. General target is not to exceed 80% DC Jason
this is from a guy at www.mototron.com i think he knows what's up. check this out too http://www.ecanfix.com/~mdhamilton/dutycycle1.html
This is electrical duty cycle - remember your actual mechanical open time will be shorter. General target is not to exceed 80% DC Jason
this is from a guy at www.mototron.com i think he knows what's up. check this out too http://www.ecanfix.com/~mdhamilton/dutycycle1.html
For example, if RPM=4000 and pulse width=24ms the duty cycle should be 80%
That formula gives: 24/(4000/30000) = 180%
The table that you linked to is correct though.
The correct formula for duty cycle is the one ChrisB posted.
Regards
Paul
11-19-2003, 06:16 PM
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Originally Posted by EFIliveV5
Are you sure that formula is for duty cycle?
For example, if RPM=4000 and pulse width=24ms the duty cycle should be 80%
That formula gives: 24/(4000/30000) = 180%
The table that you linked to is correct though.
The correct formula for duty cycle is the one ChrisB posted.
Regards
Paul
For example, if RPM=4000 and pulse width=24ms the duty cycle should be 80%
That formula gives: 24/(4000/30000) = 180%
The table that you linked to is correct though.
The correct formula for duty cycle is the one ChrisB posted.
Regards
Paul
anybody else have any input here?
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11-20-2003, 09:40 AM
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Originally Posted by robertbartsch
Question:
so is this formula correct:
inj.ms x rpm/1200 = duty cycle?
Thanks..
so is this formula correct:
inj.ms x rpm/1200 = duty cycle?
Thanks..
11-20-2003, 11:46 AM
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ok, he screwed up. that was an injector timing table of some sort that he sent me. the other one is right on. he says just a shorter version of this
Duty cycle %= inj.PW(mS)/(1/(RPM/60000)2)*100
Duty cycle %= inj.PW(mS)/(1/(RPM/60000)2)*100
11-20-2003, 12:58 PM
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Right on, here's the simplification...
dc = (pw/((1/(rpm/60000))*2))*100
dc = (pw/(2/(rpm/60000)))*100
dc = (pw*((rpm/60000)/2))*100
dc = (pw*(rpm/120000))*100
dc = pw*(rpm/1200)
dc = pw*rpm/1200
(Hope that's right - been a long time since I did algebra at school.)
Paul
dc = (pw/((1/(rpm/60000))*2))*100
dc = (pw/(2/(rpm/60000)))*100
dc = (pw*((rpm/60000)/2))*100
dc = (pw*(rpm/120000))*100
dc = pw*(rpm/1200)
dc = pw*rpm/1200
(Hope that's right - been a long time since I did algebra at school.)
Paul
11-20-2003, 01:01 PM
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Originally Posted by EFIliveV5
Right on, here's the simplification...
dc = (pw/((1/(rpm/60000))*2))*100
dc = (pw/(2/(rpm/60000)))*100
dc = (pw*((rpm/60000)/2))*100
dc = (pw*(rpm/120000))*100
dc = pw*(rpm/1200)
dc = pw*rpm/1200
(Hope that's right - been a long time since I did algebra at school.)
Paul
dc = (pw/((1/(rpm/60000))*2))*100
dc = (pw/(2/(rpm/60000)))*100
dc = (pw*((rpm/60000)/2))*100
dc = (pw*(rpm/120000))*100
dc = pw*(rpm/1200)
dc = pw*rpm/1200
(Hope that's right - been a long time since I did algebra at school.)
Paul
11-20-2003, 02:22 PM
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Terminator:
...that is a simple equation posted by EFLive:
the last line is the same formula given to me in the first post
duty cycle = injector pulse in milliseconds x RPM/1200
...that is a simple equation posted by EFLive:
the last line is the same formula given to me in the first post
duty cycle = injector pulse in milliseconds x RPM/1200
