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I have pondered various fail safe strategies for this scenario (for example, make the B controller fixed at midrange mixture) but so far have not been satisfied with any of them. Anyone have other ideas to be considered?
On electric vehicle throttle potentiometers, the software looks for an out-of-range resistance. If an out-of-range resistance is detected, the controller shuts off. The standard throttle is 5000 ohms. Typically, the controller will shut down at ~6000 ohms. This keeps the car from running you over if a throttle wire breaks.
In the case of the mixture knob, you could look for a too large resistance and perhaps a too small resistance. If either is detected, the software could display an error and go to the 12 o'clock setting. If the proper resistance is subsequently detected, the software could go back to normal operation.
Bill Dube <LED@Killacycle.com>
http://www.killacycle.com/Lights.htm
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