Patent ID: 9181829
Filing Date: 2015-11-10
Classification: F01N,Y02T

Abstract:
1. An exhaust gas purification device of an internal combustion engine mounted on a vehicle, comprising: an exhaust gas after-treatment device provided in an exhaust gas passage of the internal combustion engine and having an oxidation catalyst and a filter, the filter to collect particulate matter contained in an exhaust gas, the oxidation catalyst being located upstream of the filter in a flow direction of the exhaust gas; an exhaust pipe injector to supply an amount of fuel to the oxidation catalyst; and an electronic controller configured to— control the exhaust pipe injector to supply the fuel to the oxidation catalyst to control regeneration of the filter, and to determine whether the filter has reached a regeneration-possible state, in which a temperature of the oxidation catalyst is maintained at a high temperature and the filter is ready for regeneration, halt the regeneration of the filter until the electronic controller determines that the regeneration-possible state is reached, if the electronic controller determines, during the filter regeneration control, that the filter is not in the regeneration-possible state, calculate a first traveling distance from a time of a start of the vehicle traveling until a time when the electronic controller determines that the amount of supplied fuel is sufficient for the regeneration of the filter during the filter regeneration control, calculate a second traveling distance from a time of the start of the vehicle traveling to a current time; calculate a relative traveling distance by subtracting the first traveling distance from the second traveling distance; determine that the filter is not in the regeneration-possible state, if the relative traveling distance does not reach a predetermined traveling distance determination threshold value, which can maintain the temperature of the oxidation catalyst at the high temperature for the regeneration of the filter; and determine that the filter is in the regeneration-possible state, if the relative traveling distance reaches the predetermined traveling distance determination threshold value.