Method and apparatus for adapting air values from a performance graph

US5546916A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Michael Sudholt · Rosenheim, DE
• Manfred Wier · Wenzenbach, DE
• Stephan Krebs · Eschborn, DE
• Bernhard Bauer · Lebring, AT
• Wolfgang Reupke · Regensburg, DE

Key dates

• Filing date: Jan 30, 1995
• Grant date: Aug 20, 1996
• Expiry date: Jan 30, 2015

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F1/6965
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method and an apparatus are provided for adapting air values from a substitute performance graph to currently prevailing variables of state of ambient air. The air values are used for controlling mixture preparation if pulsations of air occur in an intake tube of an internal combustion engine instead of using measured values supplied by an air meter. The air values are adapted by multiplying the air values by an adaptation factor. In one embodiment the adaptation factor is calculated by dividing a measured value supplied by the air meter in the intake tube of the internal combustion engine by an air value taken from the substitute performance graph and subjecting the adaptation factor to sliding averaging, at times when no pulsations are present; and using a lambda-control-average value as the adaptation factor and subjecting the adaptation factor to sliding averaging, at times when pulsations are present. In another embodiment the adaptation factor is calculated by taking a substitute air value from the substitute performance graph, multiplying the substitute air value by a temperature value, multiplying a reciprocal value of the multiplication by a measured value supplied by th…