Abstract: A method for determining the quality of the fuel for an internal combustion engine, in particular a direct-injection internal combustion engine in a vehicle, which is characterized by the following be performed: the internal combustion engine is operated in idle mode under predefinable operating conditions, the curve of the injection quantity, necessary for idling, over the engine temperature is determined, and the fuel quality is inferred from the curve of the injection quantity over the engine temperature.

Abstract: A method for determining the quality of the fuel for an internal combustion engine, in particular a direct-injection internal combustion engine in a vehicle, which is characterized by the following be performed: the internal combustion engine is operated in idle mode under predefinable operating conditions, the curve of the injection quantity, necessary for idling, over the engine temperature is determined, and the fuel quality is inferred from the curve of the injection quantity over the engine temperature.

Abstract: A method for ascertaining a quality characteristic of a Diesel fuel for a Diesel internal combustion engine, having a device for determining the cylinder pressure curve of at least one cylinder, a process variable of the combustion being ascertained from the cylinder pressure curve, which characterizes the fuel quality.

Abstract: A method and a device for controlling an internal combustion engine are provided, in which method and device a deviation value is determined based on the comparison of a variable characterizing the combustion process in at least one cylinder with a corresponding setpoint value for this variable. Based on the determined deviation value, a first manipulated variable of a first actuator for influencing the start of activation is adjusted. Furthermore, based on the first manipulated variable, a second manipulated variable of a second actuator for influencing the air mass is adjusted.

Abstract: A method and a device for controlling an internal combustion engine are provided, in which method and device a deviation value is determined based on the comparison of a variable characterizing the combustion process in at least one cylinder with a corresponding setpoint value for this variable. Based on the determined deviation value, a first manipulated variable of a first actuator for influencing the start of activation is adjusted. Furthermore, based on the first manipulated variable, a second manipulated variable of a second actuator for influencing the air mass is adjusted.