초록 ▼

According to the invention, there is provided an exhaust gas purification device for purifying an exhaust gas discharged from an engine having cylinders including first and second cylinders. An exhaust stroke in the first cylinder is carried out next to an exhaust stroke in the second cylinder. The

According to the invention, there is provided an exhaust gas purification device for purifying an exhaust gas discharged from an engine having cylinders including first and second cylinders. An exhaust stroke in the first cylinder is carried out next to an exhaust stroke in the second cylinder. The exhaust gas purification device comprises exhaust branch passages which are connected to the cylinders, respectively. The exhaust branch passages include first and second exhaust branch passages which are connected to the first and second cylinders, respectively. The exhaust gas purification device comprises a common exhaust passage connected to the exhaust branch passages, a catalyst positioned in the common exhaust passage for purifying an exhaust gas, and an exhaust gas recirculation passage connected to the first exhaust branch passage. The exhaust gas recirculation passage introduces the exhaust gas from the first exhaust branch passage into an intake passage which is connected to the cylinders. According to the invention, a reducing agent is fed to only the second cylinder during the power or the exhaust stroke in the second cylinder to promote the purifying operation of the catalyst when the exhaust gas is introduced into the intake passage via the exhaust gas recirculation passage.

대표청구항 ▼

[ We claim:] [1.] An exhaust gas purification device for purifying an exhaust gas discharged from an engine having a plurality of cylinders including first and second cylinders, an exhaust stroke in said first cylinder being carried out next to an exhaust stroke in said second cylinder, comprising:e

[ We claim:] [1.] An exhaust gas purification device for purifying an exhaust gas discharged from an engine having a plurality of cylinders including first and second cylinders, an exhaust stroke in said first cylinder being carried out next to an exhaust stroke in said second cylinder, comprising:exhaust branch passages which are connected to said cylinders, respectively, said exhaust branch passages including first and second exhaust branch passages which are connected to said first and second cylinders, respectively;a common exhaust passage connected to said exhaust branch passages;a catalyst positioned in said common exhaust passage for purifying an exhaust gas;reducing agent feeding means for feeding reducing agent to said second cylinder to promote the purifying operation of said catalyst;an exhaust gas recirculation passage for introducing the exhaust gas from said first exhaust branch passage into an intake passage which is connected to said cylinders; andcontrol means for controlling said reducing agent feeding means to feed the reducing agent to only said second cylinder during one of the power and the exhaust strokes in said second cylinder when the exhaust gas is introduced into said intake passage via said exhaust gas recirculation passage.