Abstract: A method for coupling a control unit, in particular an engine control unit, for controlling a system, especially an engine, to a program for modeling an active chain diagnosis or to other programs for error analysis, having the following steps: within the scope of a first run, starting up an operating point of the system, generating an error and computing an intervention using a program for modeling the active chain diagnosis or the other programs for the error analysis, within the scope of a second run, resetting the control unit and deleting the error memory in the control unit, renewed starting up of the operating point, renewed applying of the error from the first run, carrying out the first intervention computed using the active chain diagnosis in the first run, and computing a second intervention using the program for modeling the active chain diagnosis, and within the scope of at least one additional run, resetting the control unit and deleting the error memory, renewed starting up the operating point,

Abstract: A method for determining a state of at least one component of a control unit, in which a temperature of the at least one component is determined, a type of temperature change being detected and recorded for a number of temperatures which are determined over a time period, recorded temperature changes being used to determine the state. Also described is a system for determining a state of at least one component of the control unit, a control unit, a computer program and a computer program product.

Abstract: The invention relates to a method for operating a combustion engine (1) comprising a fuel-driven heat engine (5), which permits a differentiation of faults during the supply of fuel. To this end, the fuel is supplied under pressure to the heat engine (5) via a fuel supply (10). A pressure reduction speed in the fuel supply (10) is determined, and a fault is inferred based on a comparison of the pressure reduction speed with a predetermined threshold value.

Abstract: A method for coupling a control unit, in particular an engine control unit, for controlling a system, especially an engine, to a program for modeling an active chain diagnosis or to other programs for error analysis, having the following steps: within the scope of a first run, starting up an operating point of the system, generating an error and computing an intervention using a program for modeling the active chain diagnosis or the other programs for the error analysis, within the scope of a second run, resetting the control unit and deleting the error memory in the control unit, renewed starting up of the operating point, renewed applying of the error from the first run, carrying out the first intervention computed using the active chain diagnosis in the first run, and computing a second intervention using the program for modeling the active chain diagnosis, and within the scope of at least one additional run, resetting the control unit and deleting the error memory, renewed starting up the operating point,

Abstract: A method for operating an internal combustion engine having a fuel-driven combustion motor, making possible a differentiation of faults in the fuel delivery system. Fuel is delivered under pressure to the combustion motor via a fuel delivery system. A pressure decay rate in the fuel delivery system is determined, and a fault is inferred as a function of a comparison of the pressure decay rate with a predefined threshold value.