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Charlie,
It would be easy enough to install redundant fuel pump controllers, but without overall reliability data and information as to failure modes, it would be hard to consider the controller flight-worthy.
Speeduino documentation states:
-
Fuel pump control is a simple but important function performed by the ECU. Currently Speeduino does not perform variable (PWM) pump control, but
and ends mid sentence.
The Speeduino likely has the necessary hardware since there is a closed loop PWM capability for boost control. That could probably be modified and used for fuel pump control. I haven't looked into that.
Would you consider his controller flight-worthy? I've had his website bookmarked for years, but couldn't convince myself on the wisdom of flying a product that, when I 1st discovered it, had only been installed on his bike. I still
love the idea; we'd never have vapor related fuel issues again.
Bummer that the Speeduino doesn't have the software & hardware to control the pump. You'd think they would do it, since just about every car includes pump control in the engine controller these days.
Charlie
On 6/27/2020 10:47 AM, Steven W. Boese
SBoese@uwyo.edu wrote:
Charlie,
The pump/filter unit is in a small header tank similar to the Vikingaircraftengines system. The controller is not part of the Speeduino system, but a separate unit from
madhu.com.
Steve Boese
Oooh...did I miss (or forget) a memo about the turbine pump/controller?
In-tank pump, or did you rig something external with positive delivery to its input?
Is the pump controller part of the Speeduino hardware/software, or a separate controller?
Thanks,
Charlie
Bobby,
I'm using only the MAP sensor on the Speeduino board. The fuel pressure sensor that is used with the turbine type pump and pump controller is MAP compensated.
Steve Boese
Thanks Steve. That clears up a few things. I came across posts on the SpeedUino forum discussing Table Blending had been added as a feature so I assumed two or more individual tables would be necessary. TPS, MAP, Flex Fuel sensor etc. Are you using two
MAP sensors for altitude fuel compensation?
Bobby
Sent from my iPad
Bobby,
With my Renesis dual wheel trigger setup, tooth #1 is the first tooth on the 12 tooth (crank) wheel after the signal from single tooth (cam) wheel. The crank and cam signals are actually generated by a single wheel on the E-shaft. The angle of this tooth
#1 relative to TDC can be specified in the setup.
The TPS input code has been changed to add or subtract from the pulse width after all other calculations are made in order have it act as a manual mixture control.
I also changed the VE table so the cells all are 100 initially rather than reflecting the MAP percent of the sea level pressure. The MAP percentage is now applied before the VE table values are applied. For example, the original table value would have
been 50 if MAP was half of sea level. This makes the VE table act like the EC2 mixture correction table. Changing the values in the VE table to values less or more than 100 delivers less or more fuel compared to what would be delivered as calculated from
the displacement, MAP, intake air temp, and desired AFR.
I'm not sure what table 1 and table 2 would refer to in the Speeduino - MSDruid cell phone app system I'm using.
Steve Boese
◆ This message was sent from a non-UWYO address. Please exercise caution when clicking links or opening attachments from external sources.
Another question Steve. When you switched the code for TPS are you using it in blended tables where table 2 is Alpha–N, TPS and table 1 is MAP based? Or are
you running pure Alpha–N? It appears a second MAP sensor can be wired in externally and left open to the atmosphere for altitude fuel compensation.
Thanks,
Bobby
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Friday, June 26, 2020 12:33 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: SpeedUino
I changed the code in the Speediuno to use the TPS input to give manual mixture control from a potentiometer and it works fine, both with a Speedysim board and with the actual running
engine.
◆ This message was sent from a non-UWYO address. Please exercise caution when clicking links or opening attachments from external sources.
Yes, my idea would be an opamp confgured as a summing amplifier, with the wideband on one input and biasing voltage on the other.
The TPS sounds simpler, if that will work.
On Jun 25, 2020, at 8:45 PM, "Steven W. Boese
SBoese@uwyo.edu" <flyrotary@lancaironline.net> wrote:
The O2 sensor outputs a voltage but very little current. That would make it difficult to bias it in a predictable way. Biasing a buffered output such as a wideband O2 unit output would probably work.
Steve Boese
Any reason (other than the need to run 'closed loop' all the time) to not use a bias voltage added/subtracted from the O2 sensor output, to control mixture?
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