Patent ID: 8974563
Filing Date: 2015-03-10
Classification: B01D,F01N,F02D,Y02T

Abstract:
1. An exhaust gas purification system comprising: a diesel particulate filter provided in an exhaust pipe of a diesel engine and which collects particulate matter in exhaust gas; an exhaust pipe injector provided in the exhaust pipe upstream of the diesel particulate filter to perform exhaust pipe injection into the exhaust pipe; and a diesel particulate filter regeneration control unit configured to perform temperature rise control of an exhaust gas temperature by the exhaust pipe injection to regenerate the diesel particulate filter when the particulate matter collected by the diesel particulate filter exceeds a fixed amount and which, during the regeneration, integrates an amount of time during which the exhaust gas temperature exceeds a particulate matter combustion temperature and completes the regeneration when an integrated value thereof reaches a set regeneration completion value, wherein, during the regeneration, the diesel particulate filter regeneration control unit determines an injection amount of the exhaust pipe injection that brings the exhaust gas temperature to a predetermined temperature that is higher than the particulate matter combustion temperature, integrates the injection amount of the exhaust pipe injection, and aborts the exhaust pipe injection, when a total amount of the exhaust pipe injection exceeds an exhaust pipe injection upper limit, and wherein the diesel particulate filter regeneration control unit is configured to change the particulate matter combustion temperature to a high temperature-side when the particulate matter collected by the diesel particulate filter has been removed by combustion down to or below the fixed amount.