Exhaust gas sensor

A method of determining a mass of particles or a particle mass flow in an exhaust gas system, of an internal combustion engine, having at least one resistive particle sensor, the method comprising:

• comparing a measured signal change of the particle sensor to a predicted signal change of the particle sensor;
• and
• correcting the measured signal change or the predicted signal change while taking into account influencing variables on transverse sensibilities of the particle sensor;
• wherein a predicted, accumulated particle mass flow at the particle sensor is ascertained in an accumulation model from a particle mass flow predicted from the engine model while taking into account the influencing variables on the transverse sensibilities:
• temperature of the particle sensor, exhaust gas temperature, or exhaust gas volume flow;
• and in that a predicted, accumulated mass and a predicted signal change of the particle sensor by way of a conductivity model are ascertained by means of integration from the predicted, accumulated particle mass flow.

A method of determining a mass of particles or a particle mass flow in an exhaust gas system, of an internal combustion engine, having at least one resistive particle sensor, the method comprising:

• comparing a measured signal change of the particle sensor to a predicted signal change of the particle sensor;
• and
• correcting the measured signal change or the predicted signal change while taking into account influencing variables on transverse sensibilities of the particle sensor;
• wherein a predicted, differential signal change of the particle sensor is ascertained in the accumulation model from the particle mass flow predicted from the engine model while taking into account the influencing variables on the transverse sensibilities of the particle sensor:
• temperature of the particle sensor, exhaust gas temperature, or exhaust gas volume flow;
• and in that the predicted signal change of the particle sensor is determined by means of integration of the predicted, differential signal change.

A method of determining a mass of particles or a particle mass flow in an exhaust gas system, of an internal combustion engine, having at least one resistive particle sensor, the method comprising:

• comparing a measured signal change of the particle sensor to a predicted signal change of the particle sensor;
• and
• correcting the measured signal change or the predicted signal change while taking into account influencing variables on transverse sensibilities of the particle sensor;
• wherein an influence of a current temperature of the particle sensor on the conductivity of the particle sensor is taken into account in a conductivity model or in a first temperature correction stage in order to determine the predicted signal change, or in that the influence of the current temperature is taken into account in a second temperature correction in order to determine the measured signal change.

A method of determining a mass of particles or a particle mass flow in an exhaust gas system, of an internal combustion engine, having at least one resistive particle sensor, the method comprising:

• comparing a measured signal change of the particle sensor to a predicted signal change of the particle sensor;
• correcting the measured signal change or the predicted signal change while taking into account influencing variables on transverse sensibilities of the particle sensor;
• and
• correcting a predicted, accumulated particle mass flow or the predicted, differential signal change using a weighting factor determined as a function of a particle mass accumulated on the particle sensor, a exhaust gas temperature, a temperature of the particle sensor, a exhaust gas volume flow, a predicted particle mass flow, or a measured particle mass flow.