Bayerische Motoren Werke Aktiengesellschaft

Gert Rekewitz

Gerd Kraemer

Georg Meder

Tim Beattie

In a process and a device for electronically controlling actuators of a combustion engine with variable gas exchange control using a suction pipe pressure model where the connection between the cylinder filling level and the suction pipe pressure is described by a straight line with gradient and offset, the gradient and/or offset are determined as a function of the valve overlap surface. Preferably, the gradient and/or the offset are also determined as a function of the position of the valve overlap surface. The position of the valve overlap surface can be determined by the interval between the center of gravity of the valve overlap surface and a reference crankshaft angle. This improves the control of a combustion engine in motor vehicles with a gas exchange control (for example, with variable cam shaft rotation and/or cam shaft switchover to phaseless change of the valve control time and/or the valve stroke) with a view to accuracy and flexibility.

Process and device for electronically controlling actuators of a combustion engine with variable gas exchange control

A method and apparatus is provided for correcting the airflow in a combustion engine drawn in through an induction pipe and measured in the induction pipe. The measured airflow is multiplied by a correction factor which is formed as a function of a value expressing the degree of the measurement error and a value expressing the direction of the measurement error. Preferably, the value expressing the degree of the measurement error is obtained by calculating the standard deviation or the variance of the measured airflow. The value expressing the direction of the measurement error is determined with at least one additional operating value of the internal combustion engine.

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Holzkirchen, Germany

Gert Rekewitz