Patent · US Expired

Method and arrangement for checking the operational capability of an exhaust-gas probe heater and the supply system thereof

US5090387A · kind A · utility

18Cited by

14References

8Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Rudi Mayer · Lambach, DE
Helmut Denz · Stuttgart, DE
Ernst Wild · Oberriexingen, DE
Rainer Frank · Sachsenheim, DE

Key dates

Filing date	Apr 30, 1991
Grant date	Feb 25, 1992
Priority date	—
Expiry date	Apr 30, 2011

Classification

Technology area (CPC G)Physics
CPC primaryG01N27/4067
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A method and an arrangement for carrying out the method are proposed whose fundamental concept is to perform a diagnosis of the heating device of an exhaust-gas probe, which emits a control signal for closed-loop controlling the air/fuel mixture of an internal combustion engine. The diagnosis is based on that the exhaust-gas probe is heated more rapidly because of the switching-in of the heating device than by mere heating by the exhaust gases which flow past the exhaust-gas probe. The heating device includes at least the probe heater, devices which supply the probe heater with the necessary heating power, and the supply leads therefor.

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