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Charlie,
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.
Steve Boese
From: Rotary motors in aircraft <flyrotary@lancaironline.net> on behalf of Charlie England ceengland7@gmail.com <flyrotary@lancaironline.net>
Sent: Thursday, June 25, 2020 10:21 PM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: SpeedUino
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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.
Charlie
On Jun 25, 2020, at 8:45 PM, "Steven W. Boese SBoese@uwyo.edu" < flyrotary@lancaironline.net> wrote:
Charlie,
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?
Charlie
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