Patent · US Expired

Method for determining the atmospheric pressure on the basis of the pressure in the intake line of an internal combustion engine

US6834542B2 · kind B2 · utility

3Cited by

5References

9Claims

0Family size

Assignee

Daimlerchrysler AG · US

Inventors

Werner Aschner · Ulm, DE
Ulrich Engel · Schlangenbad, DE
Hans Fausten · Bad Sobernheim, DE
Juergen Muenzenmaier · Stuttgart, DE

Key dates

Filing date	Feb 19, 2003
Grant date	Dec 28, 2004
Priority date	—
Expiry date	Feb 19, 2023

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02D2200/704
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A method for determining the atmospheric pressure on the basis of the intake pressure measured downstream of an air filter in an intake line of an internal combustion engine, and of the air mass flow rate measured downstream of the air filter, and optionally of the intake air temperature. The calculation of the atmospheric pressure and the calculation of a degree of contamination of the air filter are separated by standardizing the measured air mass flow rates at two predefined values. Furthermore, during the calculation a characteristic curve for the degree of contamination of the air filter as a function of the determined pressure difference at the predefined air mass flow rates is used, and a characteristic diagram for the degree of contamination of the air filter as a function of the standardized air mass flow rate and of the determined pressure difference is used.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.