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Author Topic:   Yamaha Command Link Fuel Flow Computation
number9 posted 10-24-2008 06:09 PM ET (US)   Profile for number9   Send Email to number9  
How is the fuel flow is [data computed] into the [Yamaha Command Link] system? Reading a recent rigging guide and information on the Yamaha leaves me puzzled. The [unclear acronym] doesn't call anything out and the only optional fuel management system sensors are for speed and quantity. Any info will be greatly appreciated.

number9 posted 10-24-2008 07:20 PM ET (US)     Profile for number9  Send Email to number9     
After a couple of hours searching found it is based upon the number of injector pulses.
jimh posted 10-24-2008 10:48 PM ET (US)     Profile for jimh  Send Email to jimh     
It is fairly typical that in a modern outboard motor with a precisely controlled fuel injection system the fuel flow data is computed from the injector duration and total time. This imputed fuel flow data tends to be quite accurate because the whole basis of the injector control system is founded on knowing how much fuel is provided with each pulse of the injector. Computing the total is just a problem in multiplication and summing.
number9 posted 10-28-2008 01:27 AM ET (US)     Profile for number9  Send Email to number9     
Thanks for a precise explanation, now it makes sense, using the digital gauges. If a mechanical fuel flow sensor was in the system it would require a analog/digital converter at some point in the system.

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