Method of monitoring the operational state of a particulate filter based on the comparison between an estimated value and a calibrated value

摘要

The system is for monitoring the working of a particle filter (3) for the exhaust gases from an internal combustion motor (1), where the filter has an upstream inflow (3a) from a turbo-compressor (2) and downstream outflow (3b), separated by porous walls. In the initial stage, an estimation is made of the filter condition at the inflow using a turbulence parameter, together with the pressure and temperature for the construction of a model for a number of dynamic physical values. In an iterative stage, the estimated values are evaluated for calculation together with known values to show the state of the filter with an adaptive iterative observation for diagnosis. The measurements upstream and downstream of the filter are passed through links (4) to the motor control unit (5).