EXHAUST SYSTEM OF INTERNAL COMBUSTION ENGINE

摘要

In an exhaust system of an internal combustion engine having a plurality of cylinders (Ia, Ib) , a control valve (9a) is disposed downstream of a junction point (7a) of one of two exhaust passages (3a, 3b) of the engine, and a control valve (9b) and a catalytic converter are disposed downstream of a junction point (7b) of the other of the exhaust passages (3a, 3b) . The control valves (9a, 9b) of the two exhaust passages (3a, 3b) are controlled so that exhaust gas of all of the cylinders (Ia, Ib) mainly passages the catalytic converter (6b) of the other exhaust passage (3b) during startup of the engine.