Patent ID: 7284545
Filing Date: 2007-10-23
Classification: F02D

Abstract:
1. A device for controlling an internal combustion engine, comprising: a plurality of cylinders and injection valves that meter fuel assigned to the cylinders; an exhaust gas probe arranged in an exhaust gas manifold and having a measurement signal that is characteristic of the air/fuel ratio in the respective cylinder; a first regulator is provided for regulating a difference that is the difference between an actual value and an estimated value of a cylinder-specific deviation of the air/fuel ratio from a predefinable air/fuel ratio that has an integral regulating parameter and a manipulated variable that is a first estimated value; a second regulator is provided for regulating a difference between the first estimated value and an air/fuel ratio and has a proportional regulating parameter and the manipulated variable that is a cylinder-specific lambda control factor; a PT1 filter is provided and a second estimated value is determined by PT1 filtering of the cylinder-specific lambda control factor; a unit is provided that determines the estimated value of the cylinder-specific deviation of the air/fuel ratio from the difference between the first and second estimated values; and an element is provided that determines a fuel mass to be supplied to the respective cylinder in the internal combustion engine as a function of a load variable and in which the fuel mass to be supplied is corrected as a function of the cylinder-specific lambda control factor and generates an actuating signal to control the injection valve as a function of the corrected fuel mass to be supplied.