Patent ID: 7574857
Filing Date: 2009-08-18
Classification: F01N,F02B,F02D,F02M,Y02T

Abstract:
1. An exhaust emission control system for an internal combustion engine comprising: a particulate filter that collects particulate matters in an exhaust gas of the internal combustion engine; a filter regenerator that regenerates the particulate filter by burning the particulate matters accumulated in the particulate filter; a filter front clogging detector that determines whether a front end portion of the particulate filter is clogged by the particulate matters; and a filter regeneration controller that controls the filter regenerator to perform a front regeneration to remove the particulate matters accumulated in the front end portion of the particulate filter by raising a temperature of exhaust gas flowing into the particulate filter to be greater than a temperature in a normal regeneration, in response to determination of the filter front clogging detector that the front end portion of the particulate filter is clogged.