Method and device for measuring the soot load in the exhaust gas systems of diesel engines

摘要

A method and device for measuring the soot load in the exhaust gas systems of diesel engines using a sensor which is mounted downstream of a particulate filter and comprises a sensor element, to measure the operability of the particulate filter. According to the method, the soot load of the sensor element is measured resistively or capacitively using electrodes. The measuring voltage of the sensor element is controlled depending on at least one actual operating parameter of the diesel engine.

主权项

1. A method for measuring a soot load of an exhaust gas in an exhaust gas system of a diesel engine as a measure of functional capability of a particle filter using a sensor having a sensor element connected downstream of the particle filter, the method comprising:
measuring the soot load one of resistively and capacitively using the sensor element, wherein electrodes are formed on the sensor element; applying a measurement voltage between the electrodes; and controlling the measurement voltage applied between the electrodes as a function of at least one instantaneous operating parameter of the diesel engine; and calculating at least one of a moisture of the exhaust gas and a temperature of the exhaust gas as the at least one instantaneous operating parameter of the diesel engine; and acquiring an optimum measurement voltage of the sensor element from the at least one of the moisture of the exhaust gas and the temperature of the exhaust gas.