Patent · US Expired

Method for monitoring a secondary air system in associated with the exhaust system of a vehicle

US6497094B1 · kind B1 · utility

3Cited by

12References

14Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Wilfried Tuleweit · Schwieberdingen, DE
Joerg Lange · Eberdingen, DE
Klaus Hirschmann · Leonberg, DE

Key dates

Filing date	Jun 29, 2001
Grant date	Dec 24, 2002
Priority date	—
Expiry date	Jun 29, 2021

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/40
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

A method for monitoring a secondary air system in combination with the exhaust-gas system of a motor vehicle is described. The method includes the steps of: providing a probe downstream of the junction of a secondary air line into the exhaust-gas channel; obtaining an air/fuel ratio (&lgr;exhaust gas) utilizing the probe; obtaining a signal for the intake air flow (massintake air); arithmetically determining the secondary air mass (masssecondary air) in dependence upon (a) the ratio of intake air flow to fuel (&lgr;engine), which is metered per unit of time; (b) the air/fuel ratio (&lgr;exhaust gas); and, (c) the signal for the intake air flow (massintake air); and, evaluating the operability of the secondary air system in dependence upon the secondary air mass (masssecondary air).

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