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Hello,
I tried to create a duty cycle graph by making the channels and using the Math function to put a duty cycle in the graph area, but it does not plot a line in the timeline. Does anyone know how to do this. I followed the you tube videos, but all of them were for LS engines. Maybe diesel needs another item in the channels to calculate?Attachment 100663
Duty cycle of what?
Sorry Injector Duty Cycle.Quote:
Originally Posted by Jim P
I don't think I've ever seen anyone mention injector duty cycle when tuning a diesel application. This might be due to the fact that if you were to try tuning based off of the traditional gasoline application of running to a max duty cycle of say 85% or 90%, you'd have blown your diesel engine long before getting there.Quote:
Originally Posted by nbdiesel1
Your window for the injection event is much, MUCH shorter on a diesel than it is on a gasoline engine application. Typically, you won't see much beyond 3.2 ms (3,200 uSec) of injector pulsewidth on a diesel (and that's considered very heavy fueling) whereas you could see 30+ ms (30,000+ uSec) on injector pulse on a gas app.
So, I would suggest at least brushing up on the theory of diesel engine dynamics before attempting to tune one.
Thank you for the response. I do not plan on tuning anything yet, just data logging and seeing whats going on from there. Thats why I was asking. Thank you again.Quote:
Originally Posted by B00STJUNKY
Injector duty cycle definitely not worth mentioning on a diesel. Consider the 3200microsecond injector open time a rough ballpark of max effort on a stock 5.9L, turning 3000rpms at that pulsewidth is only 8% duty cycle.
That math PID in the above attached photo should be renamed to Main Injection Injector Duty Cycle %. It?s not factoring in pilot and post events.