Patent Number: 6,254,765

Title: Method of regulating the temperature of a sensor

Abstract: A method for regulating the temperature of a sensor for determining an oxygen concentration in gas mixtures, in particular in exhaust gases of internal combustion engines, where a detection voltage that corresponds to the oxygen concentration and is supplied by a Nernst measurement cell is analyzed, the sensor is adjusted to an operating temperature by a heating device, and the instantaneous operating temperature is determined from a measurement of an internal a.c. resistance of the Nernst measurement cell. In starting and/or restarting operation of the sensor, an internal a.c. resistance of a lead of electrodes of the Nernst measurement cell is determined, and the instantaneous internal a.c. resistance thus determined is taken into account in determining the operating temperature.

Inventors: Diehl; Lothar (Stuttgart, DE)

Assignee: Robert Bosch GmbH

International Classification: G01N 27/406 (20060101); G01N 027/409 ()

Expiration Date: 07/03/2018