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AndrewCologne AndrewCologne is offline
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Join Date: Aug 2015
Location: Cologne / Germany
Posts: 85

So I would need

- a temp sensor or even using the existing 15c and 35c temp switches
- a narrowband- or even a Bosch LSU 4.9 wideband oxygene sensor
- a Raspberry Pi
- an A/D and D/A converter

And a code which reads the input voltage of the sensor where a controlled 12v PWM duty cycle would be provided to the frequency valve brining/keeping the AFR to stoich.

Beside this, if the the Throttle switch is beyond 30% or/and the temp sensor provides below 15c the duty cycle provided to the FV would be 65%. And if the temp is below 35c, then when passing the 5 angle on hitting the gas pedal the duty cycle to the FV would be 75% for 3 Secs.

So using C or C++ there would be an if/then Loop where all the input from the switches and sensors would be read out which affects the PWM voltage duty cycle provided to the FV.

So ... someone has skills on how to attach an A/D converter to the Raspberry Pi which provides the sensor voltage and the position of the switches at the throttle body?
And also attaching a D/A converter providing the correct 12v PWM based duty cycle to the FV.
911 SC 3.0, 1982, black, US model
Old 07-04-2018, 03:42 PM
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