EXHAUST GAS CONTROL APPARATUS AND EXHAUST GAS CONTROL METHOD FOR ENGINE

摘要

An exhaust gas control apparatus for an engine, the exhaust gas control apparatus includes a filter, a selective reduction catalyst, a reducing agent supply device and an electronic control unit. The filter is provided in an exhaust passage, and collects particulate matter. The selective reduction catalyst is provided downstream of the filter in the exhaust passage, and reduces a nitrogen oxide. The reducing agent supply device is configured to supply the ammonia to the selective reduction catalyst. The electronic control unit is configured to perform filter regeneration processing of regenerating the capability of the filter to collect the particulate matter, and continue the filter regeneration processing in a case where an integrated value of time when a bed temperature of the selective reduction catalyst during execution of the filter regeneration processing exceeds a certain value is less than or equal to a default value.