Method for the diagnosis of a continuous-action lambda probe

US6287453A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Gerd Rösel · Dresden, DE
• Hong Zhang · Tegernheim, DE

Key dates

• Filing date: Sep 30, 1999
• Grant date: Sep 11, 2001
• Expiry date: Sep 30, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G05B23/024
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Periodic forced stimulations are asserted on setpoint values for a lambda control and a system response of a lambda control loop is simulated by a model that includes a sensor delay time as the model parameter. Amplitude gains of the model and the system are compared with each other and adapted according to the result of the comparison of the model parameters. If the adaptation value lies above a threshold, a lambda probe is classified as defective.