Patent ID: 8122711
Filing Date: 2012-02-28
Classification: F01N,G01M,G01N,Y02T

Abstract:
1. A method of ascertaining a sooty particle concentration with a collecting particle sensor in an exhaust gas system of an internal combustion engine and a depletion of an emission purification system of the internal combustion engine due to a loading of sooty particles, the method comprising: accepting a sensor signal as an electrical current through the collecting particle sensor and developing a current gradient from the sensor signal by a signal smoothing and a formation of gradients; determining the sooty particle concentration by a sensor signal emitted by the collecting particle sensor and the current gradient; determining the depletion of the emission purification system from the sooty particle concentration; and correcting the sensor signal through predetermined corrections of at least one of: a sensor temperature, an exhaust gas temperature, a flow velocity of the exhaust gas, and a voltage applied at the collecting particle sensor.