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Output torque control apparatus and method for an internal combustion engine

  • US 5,660,157 A
  • Filed: 06/16/1995
  • Issued: 08/26/1997
  • Est. Priority Date: 06/17/1994
  • Status: Expired due to Term
First Claim
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1. An output torque control apparatus for an internal combustion engine comprising:

  • a data processor unit programmed to perform the following functions;

    an air fuel ratio controlling function for controlling an air fuel ratio of said internal combustion engine;

    a lean limit air fuel ratio determining function for determining a lean limit air fuel ratio by detecting variation of an output torque of the internal combustion engine; and

    a limit air fuel ratio comparing function for comparing the lean limit air fuel ratio with a limit air fuel ratio corresponding to a predetermined emission amount of a nitrogen oxide component in an exhaust gas from the internal combustion engine;

    wherein said air fuel ratio controlling function controls the air fuel ratio based on a result of comparing the lean limit air fuel ratio with the air fuel ratio corresponding to said predetermined emission amount of a nitrogen oxide component.

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