Patent · US Active

Method for monitoring a broadband lambda probe

US9500152B2 · kind B2 · utility

1Cited by

2References

8Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Bernhard Ledermann · Weil der Stadt, DE
Claudius Bevot · Stuttgart, DE
Rolf Reischl · Stuttgart, DE

Key dates

Filing date	Nov 15, 2012
Grant date	Nov 22, 2016
Priority date	—
Expiry date	Aug 18, 2033

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/40
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A method for determining a polarization of a pump cell and/or a Nernst cell of a lambda probe for the diagnosis of the broadband lambda probe. A voltage or current pulse is applied to the pump/Nernst cell in a first method task, and, in a second method task, a voltage at the pump cell and/or the Nernst cell, or a variable that is related to the polarization or its time characteristic is determined and used as a measure of the polarization, and the function of the broadband lambda probe is monitored via the ascertained polarization. The determination of the polarization may be performed as a voltage measurement performed once or multiple times, or by determining the effect of the polarization in an associated controller, such as a pump current controller of an engine control unit. The variable associated with the polarization may be the reaction of the pump current control.

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