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

US6505505B1 · kind B1 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Ronald Henzinger · Regensburg, DE
• Harald Leiderer · Geesthacht, DE
• Hermann Leiderer · Geisingen, DE
• Andreas Wildgen · Nittendorf, DE

Key dates

• Filing date: Aug 17, 2000
• Grant date: Jan 14, 2003
• Expiry date: Aug 17, 2020

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2200/704
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

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.