Method and apparatus for checking sensors

US4615321A · kind A · utility

Assignee

• Daimler-Benz AG · DE

Inventors

• Gunther Haefner · Stuttgart, DE
• Bernhard Bauer · Lebring, AT
• Ulrich Letsche · Stuttgart, DE
• Karl-Ernst Noreikat · Eßlingen, DE

Key dates

• Filing date: Aug 6, 1984
• Grant date: Oct 7, 1986
• Expiry date: Aug 6, 2004

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D18/00
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method and apparatus for checking sensors, in which the measurement signals, electrically detected in a checking unit and representative of the operating conditions of an internal combustion engine, are statically monitored. The measurement signals are checked with respect to whether their physical measured values are technically significant and lie within the permissible range and if an error is detected, a measure is initiated which counteracts this error; the cyclically detected measurement signals are thereby checked with respect to a change in their measured values from one sampling cycle to a successive one and are accepted only if the change in measured values is within permissible limits. Stochastic disturbances are gated out of the measurement signal and registered and tolerated up to a significant limit. If faulty measurement signals are detected, an emergency operating procedure is activated which counteracts this fault.