Graham Rudd Posted March 17, 2002 Share Posted March 17, 2002 I want to make a device to measure the duty cycle of an injector but I'm not 100% certain of how the duty cycle is measured, I *think* I know, but lets make sure. To get the duty cycle percentage is it as simple as measuring the pulse width and dividing by the pulse width + the time until the next pulse? Or is there some subtlety I'm missing? i.e. pulse width duty cycle% = --------------- pulse width + time measured until next pulse Any help would be much appreciated. If anyone has any good links to technical articles on this kind of thing then that would be fantastic. Many thanks, Graham Quote Link to comment Share on other sites More sharing options...
Rich J Posted March 17, 2002 Share Posted March 17, 2002 Pretty sure Pete Betts already makes one (or it is in development) may be worth asking him. Quote Link to comment Share on other sites More sharing options...
Graham Rudd Posted March 17, 2002 Author Share Posted March 17, 2002 Yep, Pete already does one, so I'm hoping he wanders into this thread and has the patience to answer. I don't really want to ask him directly as he might find these questions (very simple questions from his perspective) a little tedious. Graham Quote Link to comment Share on other sites More sharing options...
Alex Posted March 17, 2002 Share Posted March 17, 2002 Does this site help?? http://www.rceng.com/technical.htm Quote Link to comment Share on other sites More sharing options...
THOR Racing Posted March 18, 2002 Share Posted March 18, 2002 Duty Cycle = Pulse Width on ON period (s) --------------------------------- X 100% Period (s) Where Period is the time between two +ve rising edges (or two -ve falling edges, either will do) Duty cycle is the ratio of the ON period with respect to the total period of the waveform. So if the injectors are being pulsed at 1000Hz then the period is 1/1000 = 1ms and if they are on for 0.5ms then the Duty Cycle is obviously 0.5ms /1ms *100% = 50% Similarly if they are on for 0.20ms and the period is 0.5ms ( then the duty cycle is 40%) See http://www.trlperformance.com/afri.html regards Pete Quote Link to comment Share on other sites More sharing options...
Graham Rudd Posted March 18, 2002 Author Share Posted March 18, 2002 Thanks Pete, thats exactly what I wanted to know, and what I was trying to say.. in a cak handed way. Graham Quote Link to comment Share on other sites More sharing options...
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