[Gasification] Automatic/Manual Luft Controller

[andy schofield]

Dear Gordon,

   What is needed is some type of feedback controller. However the oxygen sensor signal sometimes is quite noisy. If the sensor is not hot enough, the signal goes away, even when using a heated type. Ford calls these HEGO or "Heated Exhaust Gas Oxygen" sensor. 

  When coasting down a hill, or changing gears The signal goes all over the scale. Only when continuous shaft-power is being developed, can a good voltage be read, and acted upon. When Ford finally abandoned using "variable venturi" and began using liquid fuel injectors, the fuel map became reliable.

  I would agree that using a second computer is a good plan. Not to look at the noisy signal from an O2 sensor directly, but to see what  duty-cycle commands the engine control sends to actuate the injectors. This pulsed-signal may more closely reflect what the engine needs in real time.  The OEM has already done much good thinking on this. In my system I de-energize the in-tank electric fuel pump when the gasifier is up to operating temperature. This generally takes 1.5 miles after gasifier light-off.

   Now spending more time chopping wood than welding.

Andy Schofield 
Great Lakes Renewable Fuels

   

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