Patent · US Expired

Method and apparatus for monitoring and adjusting .lambda.-probe-controlled catalytic exhaust gas emission control systems of internal combustion engines

US4622809A · kind A · utility

114Cited by

2References

10Claims

0Family size

Assignee

Daimler-Benz AG · DE

Inventors

Jorg Abthoff · Plüderhausen, DE
Hans-Dieter Schuster · Schorndorf, DE
Gottfried Wollenhaupt · Stuttgart, DE
Gunter Loose · Waiblingen, DE
Michael-Rainer Busch · Großenhain, DE

Key dates

Filing date	Apr 8, 1985
Grant date	Nov 18, 1986
Priority date	—
Expiry date	Apr 8, 2005

Classification

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

Abstract

A method for testing and adjusting catalytic exhaust gas emission control systems of internal combustion engines, in which the fuel-air-ratio is regulated by means of a .lambda.-probe (control-probe) arranged in the exhaust gas stream upstream of the catalyst, whereby the exhaust gas stream is measured downstream of the catalyst by means of a further .lambda.-probe (test-probe). The voltage average value and amplitude magnitude of the signal produced by the test-probe are determined and serve for adjusting the operating point of the control system and for the recognition of the catalyst efficiency.

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