Abstract: A method for operating an internal combustion engine having a motor with cylinder and an injection system having a common rail and injectors for the cylinders. Each injector has an accumulator for holding fuel from the common rail. A multiple injection of fuel is performed during each working cycle of a cylinder, including injecting a first amount in a first injection and injecting a second amount in a second injection, and determining fuel pressure for the common rail and/or the accumulator. A fuel injection amount parameter is determined for the first injection; an individual accumulator pressure and/or a common rail pressure is determined for the second injection; and a fuel injection amount parameter is determined for the second injection. The individual accumulator pressure and/or the common rail pressure are/is considered for determining the injection amount parameter of the fuel for the second injection.

Abstract: A method for operating an internal combustion engine having a motor with cylinder and an injection system having a common rail and injectors for the cylinders. Each injector has an accumulator for holding fuel from the common rail. A multiple injection of fuel is performed during each working cycle of a cylinder, including injecting a first amount in a first injection and injecting a second amount in a second injection, and determining fuel pressure for the common rail and/or the accumulator. A fuel injection amount parameter is determined for the first injection; an individual accumulator pressure and/or a common rail pressure is determined for the second injection; and a fuel injection amount parameter is determined for the second injection. The individual accumulator pressure and/or the common rail pressure are/is considered for determining the injection amount parameter of the fuel for the second injection.

Abstract: A method for correcting the start of injection of injectors of an internal combustion engine, including the following steps: determining a target start of current application depending on at least one parameter of the internal combustion engine; detecting a pressure in an individual accumulator of an injector and determining a measured start of injection on the basis of the pressure; determining a target injection delay depending on at least one parameter of the internal combustion engine; calculating an actual injection delay from the target start of current application and the measured start of injection; comparing the target injection delay and the actual injection delay; and calculating a start-of-current-application correction variable on the basis of the comparison and correcting the target start of current application by the start-of-current-application correction variable.