Patent · US Expired

Apparatus for monitoring leakage into exhaust lines

US5351526A · kind A · utility

7Cited by

3References

6Claims

0Family size

Assignee

Aft Atlas Fahrzeugtechnik GmbH · DE

Inventors

Harald Krohm · Bochum, DE
Ludger Holscher · Lüdenscheid, DE

Key dates

Filing date	Jun 11, 1993
Grant date	Oct 4, 1994
Priority date	—
Expiry date	Jun 11, 2013

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/40
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

Apparatus for monitoring suction leakage of external air into the exhaust gas path of an internal combustion engine during intermittent reduced pressure phases of engine running, includes two oxygen concentration sensing lambda probes arranged at a distance from one another along the path. The probes issue signals indicative of such oxygen concentration which are fed to a control device, such that an error signal is generated on deviation of the two probe signals from one another as caused by suction entry of external air into the path solely during a reduced pressure phase.

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