Patent · US Expired

Method for checking analog sensors

US6421625B1 · kind B1 · utility

5Cited by

6References

7Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Wojciech Cianciara · Grünthal, DE
Ralph Mader · Bad Abbach, DE
Michael Stürtz · Regensburg, DE
Gerhard Fischer · Darmstadt, DE

Key dates

Filing date	Nov 1, 1999
Grant date	Jul 16, 2002
Priority date	—
Expiry date	Nov 1, 2019

Classification

Technology area (CPC G)Physics
CPC primaryG01D3/08
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

After the start of an internal combustion engine, a check is made to see whether a positive change in a measurement signal is established. A positive change is established if the measurement signal lies below a predetermined threshold value when the internal combustion engine is started. A fault entry is made if, within a predetermined time period, the positive change in the measurement signal, expressed as the difference between the measurement signal when the internal combustion engine is started and a present value of the measurement signal when the time period has elapsed, does not reach an expected value.

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