Patent ID: 6829890
Filing Date: 2004-12-14
Classification: F01N,F02B,F02D,F02M,Y02T

Abstract:
A method of imposing a forced regeneration cycle on a diesel particulate filter that treats exhaust gas passing through an exhaustsystem of a turbocharged diesel engine to force regeneration of the filter, the method comprising:during engine running time, repeatedly processing data that represents engine speed, data that represents engine fueling, data that represents turbocharger boost, and data that represents exhaust gas recirculation (EGR) from the exhaust system back into the engine, through an engine emissions model to yield values representing rates at which diesel particulate matter (DPM) from the engine is entering the exhaust system and values for NOx concentration in the exhaust gas; repeatedly processing the values for NOx concentration in the exhaust gas, values representing concentration of O2 in the exhaust gas entering the filter, and values representing temperature of exhaust gas entering the filter through a DPM oxidation model to yield values of DPM oxidation rate data representing the rate at which DPM is being oxidized in the exhaust system; repeatedly processing the values of DPM oxidation rate data and the values representing a rate at which DPM from the engine is entering the exhaust system data through a DPM accumulation model to yield values of net DPM accumulation representing net accumulation of DPM in the filter at various points of time during engine running time; repeatedly processing accumulated engine running time through an ash accumulation model to yield data representing ash accumulation in the filter; repeatedly processing the values of net DPM accumulation and the data representing ash accumulation in the filter through regeneration initiating/terminating logic for commanding a forced regeneration cycle when a result of the latter processing calls for initiation of forced regeneration of the filter and for discontinuing the forced regeneration cycle when a subsequent result calls for termination of the forced regeneration cycle.