Method and device for regenerating a particle sensor

摘要

A method for regenerating a particle sensor, which comprises a ceramic base body, in the exhaust gas duct of an internal combustion engine for driving a motor vehicle, wherein a particle loading of the particle sensor is determined by applying an electrical voltage between at least two electrodes with interdigital arrangement, a temperature of the particle sensor is determined with a temperature sensor mounted to the ceramic base body or from the electrical resistance of a heating element and said particle sensor is regenerated by means of heating with the electrical heating element.

主权项

1. A method for regenerating a particle sensor (20), which comprises a ceramic base body, in an exhaust gas duct of an internal combustion engine (10) for driving a motor vehicle, comprising
(a) determining a particle loading of the particle sensor (20), (b) determining a temperature of the particle sensor (20), (c) regenerating said particle sensor by heating with an electrical heating element (26), (d) after a water crossing operation of the motor vehicle with the heating element (26) switched off and the electrodes (22, 23) free of voltage, determining the temperature of the particle sensor (20), an exhaust gas temperature (34) and/or a pipe wall temperature (35) as a release condition that must be fulfilled before initiating regeneration of the particle sensor (20), and (e) considering the release condition fulfilled if the temperature determined in step (d) exceeds a predetermined release temperature (36).