Patent ID: 7930880
Filing Date: 2011-04-26
Classification: F01N

Abstract:
1. A method for triggering a new regeneration event in a soot-trapping device disposed in an exhaust gas stream of an internal combustion engine, comprising the steps of: a) determining instantaneous engine speed and engine load; b) determining instantaneous mass fractions for wet soot and for dry soot in said exhaust gas stream for said instantaneous engine speed and load; c) determining instantaneous concentrations of wet and dry soot particles in said exhaust gas; d) determining the rates of accumulation of wet soot and dry soot in said soot-trapping device; e) determining the total amounts of wet soot and dry soot accumulated in said soot-trapping device during all engine operation conditions since the latest previous regeneration event; and f) triggering said new regeneration event when said total amounts of wet soot and dry soot exceed a permissible value.