Method and device for determining the ambient pressure in an internal combustion engine, and air mass meter therefor

It is possible to dispense with a separate ambient pressure sensor. For that purpose, the ambient pressure pu is determined from the absolute pressure ps in the intake tract of an internal combustion engine, the intake air mass flow rate Q and the air temperature T, as well as a pressure loss coeffi...

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Bibliographische Detailangaben
Hauptverfasser:	HENZINGER RONALD, LEIDERER HERMANN, LEIDERER HARALD, WILDGEN ANDREAS
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING COMBUSTION ENGINES CONTROLLING COMBUSTION ENGINES HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MEASURING MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL MECHANICAL ENGINEERING METERING BY VOLUME PHYSICS TESTING WEAPONS
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Beschreibung
Zusammenfassung:	It is possible to dispense with a separate ambient pressure sensor. For that purpose, the ambient pressure pu is determined from the absolute pressure ps in the intake tract of an internal combustion engine, the intake air mass flow rate Q and the air temperature T, as well as a pressure loss coefficient Cb. Calibration of the value for the ambient pressure pu determined in this way when the internal combustion engine is idling or at a standstill makes it possible to diagnose an impermissibly contaminated air filter by deducing from the change in the pressure loss coefficient Cb.