Patent Number: 9,970,344

Title: Method of evaluating a soot quantity accumulated in a selective catalytic reduction washcoated particulate filter (SDPF)

Abstract: A method is disclosed for evaluating a soot quantity accumulated in a Selective Catalytic Reduction wash-coated particulate filter of an internal combustion engine. The internal combustion engine is equipped with an exhaust gas aftertreatment system including an urea injector. Using a map correlating a urea quantity value, a NOx quantity value, a temperature value and a mass flow value to a correction value of a soot quantity is used to correct an estimated value of the soot quantity in order to obtain an evaluated value of the soot quantity.

Inventors: Ricci; Isadora (Turin, IT), Aceto; Alessandra (Turin, IT), Pellegrino; Stefano (Trofarello, IT), Bologna; Giuseppe Mazzara (Nicosia, IT)

Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC

International Classification: F01N 3/00 (20060101); F01N 3/035 (20060101); F01N 9/00 (20060101); F01N 3/021 (20060101); F01N 3/20 (20060101)

Expiration Date: 2022-05-15 0:00:00