Patent ID: 6386180
Filing Date: 2002-05-14
Classification: F02D

Abstract:
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.