Patent ID: 9097150
Filing Date: 2015-08-04
Classification: F01N,F02D,Y02T

Abstract:
1. A method of estimating a variation of a quantity of soot accumulated in a diesel particulate filter for initiating active regeneration of the diesel particulate filter coupled to an internal combustion engine having an engine control unit, wherein the method comprises: a passive-regeneration check for checking whether a passive regeneration of the diesel particulate filter is occurring and, when the passive-regeneration check yields that a passive regeneration is actually occurring, the method further comprises the steps of: storing an initial quantity of soot accumulated in the diesel particulate filter when the passive regeneration began in a memory system; determining a rough variation of the quantity of soot accumulated in the diesel particulate filter; determining an engine speed and an engine load of the internal combustion engine; determining a correction factor to account for passive regeneration using the engine speed, the engine load and the initial quantity of soot, and calculating with the engine control unit, a variation of the quantity of soot accumulated in the diesel particulate filter as a function of the rough variation and the correction factor; wherein the variation of the quantity of soot accumulated in the diesel particulate filter is used to compute a current quantity of accumulated soot in the diesel particulate filter for triggering an active regeneration thereof when the current quantity of accumulated soot exceeds a predetermined threshold value.