Method and device for operating an internal combustion engine

Abstract

The invention relates to a method for operating an internal combustion engine (106) of a motor vehicle with at least two cylinders (102, 103, 104, 105), the method comprising: - knowing said cylinders (102, 103, 104, 105) corresponding torque outputs of the respective cylinders (102, 103, 104, 105) based on the injection of fuel into the respective said cylinders (102, 103, 104, 105), - knowing the difference of said torque outputs, - said torque outputs The difference is compared with a predetermined threshold value for said torque output, - the corresponding injection quantity of the corresponding injection in the corresponding said cylinder (102, 103, 104, 105) is known, - the injection quantity is known difference, - compares the difference of the injection quantity with a predetermined threshold value for the injection quantity, and, when the detected difference exceeds the associated threshold value, - it is determined whether the corresponding torque output corresponds to the associated and, when the corresponding said torque output is outside the predetermined tolerance range for the corresponding, agreed injection quantity, - at least in said cylinders (102, 103, 104, 105) to change the injection timing (T) in one of the cylinders.

Description

technical field [0001] The invention relates to a method for operating an internal combustion engine. The invention also relates to a device for operating an internal combustion engine, which is designed to carry out the method. Background technique [0002] In motor vehicles with a so-called common rail injection system (also called accumulator injection system), several injectors, typically all injectors, are connected to a common fuel distributor (common rail) under high pressure coupled. The fuel injection quantities to be injected into the cylinders of the internal combustion engine in each case within a cylinder stroke (also referred to as a working stroke) are typically initially metered in such a way that with a selected shorter or longer actuation duration to drive the corresponding injectors to inject fuel into the corresponding cylinders. During the actuation duration, the injectors are respectively opened. [0003] Due to manufacturing tolerances and aging ph...

AI Technical Summary

Problems solved by technology

This can lead to torque differences between cylinders, which can adversely affect the smooth running or emissions performance of the internal combustion engine

Wear phenomena or deposits can therefore in particular lead to changes in the actual opening duration or actual opening degree of the injector for a given fuel pressure and actuation duration over the life of the injector

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