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Active Wide-band Air Fuel Ratio Indicator

  • US 20110043349A1
  • Filed: 08/24/2010
  • Published: 02/24/2011
  • Est. Priority Date: 08/24/2009
  • Status: Abandoned Application
First Claim
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1. An apparatus for protecting an engine of a vehicle, the apparatus comprising:

  • one or more processors;

    one or more memory units coupled to the one or more processors; and

    a visual indicator coupled to the one or more processors;

    the apparatus being configured to;

    read a throttle position voltage, an engine RPM voltage, and a voltage from an air fuel ratio (AFR) system comprising a wide-band oxygen sensor;

    convert the voltage from the AFR system to an AFR value;

    determine whether the throttle position voltage exceeds a preset threshold throttle position voltage;

    in response to determining that the throttle position voltage exceeds the preset threshold throttle position voltage, determine whether the AFR value exceeds a preset safe lower AFR limit or a preset safe upper AFR limit and whether the engine RPM voltage exceeds a preset threshold RPM voltage;

    in response to determining that the AFR value exceeds the preset safe lower AFR limit or the preset safe upper AFR limit and the engine RPM voltage exceeds the preset threshold RPM voltage, turn on the visual indicator.

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