Patent ID: 8919106
Filing Date: 2014-12-30
Classification: F01N,Y02A,Y02T

Abstract:
1. A method for operating a motor vehicle internal combustion engine with an exhaust system branch in which a wall-flow exhaust particle filter with inlet and outlet channels that are alternately closed at opposing ends and are separated from each other by porous channel walls is arranged, the method comprising: continuously determining an amount of ash and an amount of soot accumulated in the exhaust particle filter; determining an ash increase value that characterizes an increase in the amount of ash; and if pre-set conditions are present, changing over the operation of the internal combustion engine to a special operating mode for performing an ash detachment and transportation operation, the special operating mode comprising wherein the pre-set conditions for changing over the internal combustion engine operation comprises dropping below a pre-settable soot amount limit value for the amount of soot and exceeding a pre-settable ash increase limit value for the ash increase value.