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Neil,
If I understand correctly it’s the same methodology. Main fuel table is based on MP. Secondary fuel table is based to TPS. Trim pot is used in place of TPS. Tune with the trim pot at the 50% setting and provide
a smooth fuel transition for rich or lean within a percentage you are comfortable with.
Bobby
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Friday, July 30, 2021 5:07 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] FW: FW: [FlyRotary] Re: Fuel Tech
Dave and Bobby,
Below is response from my bloke in OZ who is the expert in Fueltech. So looks like I now just need the trim knob and not the TPS. What do you think?
Neil.
From: Nathaniel @ FuelTech <nathaniel@fueltech.net>
Sent: Friday, July 30, 2021 9:44 AM
To: 12348ung@gmail.com
Subject: Re: FW: [FlyRotary] Re: Fuel Tech
Hey Neil
The way they have done it on the microsquirt is to really overcomplicate something that doesn't need to be done. The way that was mentioned first is going to be the easiest way to do it.
We make a main fuel table that is based off the manifold vacuum/boost, then apply a % correction based off the TPS. Which in this case will just be a trim knob. The good thing as well is we can have fuel enrichment based off manifold pressure
change which will allow for the change in throttle if there is ever enough of a change that it requires extra enrichment. This is all delta changes, so if manifold vacuum/boost changes in a slow manner then there is no need for extra fuel, but if the delta
is high because of a rapid change it will compensate.
So I would do as suggest and fit the trim knob and wire it to the ECU as a TPS
Nathaniel
Alt Phone: 678-493-FUEL (3835)
Dave,
Last year a purchased a Microsquirt to play with on the bench. I managed to get a working manual mixture control. It uses two blended fuel tables. The
Fueltech may have a similar way to modify the fuel formula. I like the build in screen of the Fueltech.
VE1 – Speed Density – Primary Fuel Load
VE2 – Alpha –N - Secondary Fuel Load - 10K trim pot
(all tuning done at 50% TBS position / center of trim pot)
Secondary fuel - multiplicative
Multiply MAP – don’t multiply
VE2 – test values. TPS position moves vertically within the column.
Bobby
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Tuesday, July 27, 2021 5:14 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Fuel Tech
No, the EC2 does not use a TPS and I don't have one mounted. A TPS is not really necessary in aviation use because we don't have a lot of big rapid throttle changes or throttle-RPM
mismatch situations.
This is the TPS adjustment table that I am going to try to start with. Fine adjustment in the middle and larger adjustments at the extremes of travel on the knob. Super easy to
change the table based on what I find works best.
Dave, you are a cunning boy! Do you still use one on the throttle, I suspect not?
Neil.
The fueltech has a programmable mixture table table to be used with a throttle position sensor(TPS) which is simply a potentiometer. So simply mount a potentiometer, tell the
fueltech it is a TPS, and adjust the TPS mixture adjustment map to your liking. There you have a manual mixture knob.
In fact, the EC-2's Control board returns the voltage of its 5K ohm potentiometer so I hope to simply use that one which is already mounted.
It is also possible to use the micro switches in the EC2's control module to activate almost anything you want through the fueltech.
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