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Method and device for operating an internal combustion engine

  • US 6,386,180 B1
  • Filed: 11/09/2000
  • Issued: 05/14/2002
  • Est. Priority Date: 01/12/1999
  • Status: Expired due to Term
First Claim
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1. A method for operating an internal combustion engine which is operated in at least one operating state with a lean air/fuel mixture, the method comprising the steps of:

  • determining the fuel mass as a first quantity, which is to be injected, in dependence upon a desired value;

    determining an injection time as a second quantity, which is to be outputted, and outputting the injection time;

    determining an actual torque of the engine from at least one of said quantities and comparing to a permissible torque;

    initiating a fault reaction when the actual torque is greater than the permissible torque;

    making a check as to whether a quantity, which represents the oxygen concentration of the exhaust gas, exceeds a predetermined limit value; and

    , initiating a fault reaction when a measured value of said oxygen concentration does not exceed the limit value.

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