초록 ▼

An internal combustion engine having a lean NOx catalyst is capable of relieving a load upon an engine fuel injection device by eliminating the use of sub-injection, and of well purifying an exhaust gas and recovering from S-poisoning even by eliminating the use of the sub-injection. The internal co

An internal combustion engine having a lean NOx catalyst is capable of relieving a load upon an engine fuel injection device by eliminating the use of sub-injection, and of well purifying an exhaust gas and recovering from S-poisoning even by eliminating the use of the sub-injection. The internal combustion engine has a combustion heater for allowing a flow of combustion gas through an engine intake passageway to raise temperatures of engine related elements, a lean NOx catalyst, provided in an engine exhaust passageway, for purifying an engine exhaust gas, and a combustion gas introducing passageway for introducing at least some proportion of a combustion gas emitted by the combustion heater, toward upstream of the lean NOx catalyst in the engine exhaust passageway from the engine intake passageway when making a request for a reproducing process of the lean NOx catalyst.

대표청구항 ▼

1. An internal combustion engine having a lean NOx catalyst, comprising:a combustion heater for raising temperatures of engine related elements; a lean NOx catalyst provided in an engine exhaust passageway for purifying an engine exhaust gas; and a combustion gas introducing passageway for introduci

1. An internal combustion engine having a lean NOx catalyst, comprising:a combustion heater for raising temperatures of engine related elements; a lean NOx catalyst provided in an engine exhaust passageway for purifying an engine exhaust gas; and a combustion gas introducing passageway for introducing a combustion gas emitted by the combustion heater upstream of said engine and said lean NOx catalyst when making a request for a reproducing process of said lean NOx catalyst; wherein the time when making the request for the reproducing process of said lean NOx catalyst is at least one of the conditions of a time when requiring a NOx reduction of said lean NOx catalyst, a time when requiring a recovery from S-poisoning of said lean NOx catalyst and a recovery from SOF-poisoning thereof, and a time when requiring a removal of particulate matters from said lean NOx catalyst, and wherein when requiring the NOx reduction of said lean NOx catalyst, and when requiring the recovery from the S-poisoning of said lean NOx catalyst, an air-fuel ratio of the combustion gas emitted by the combustion heater is enriched as in the case of said lean NOx catalyst being in the reduction atmosphere air.