CONTROL DEVICE FOR EXHAUST GAS FLOW TO TURBO-CHARGER

摘要

PURPOSE:To discharge exhaust gas from a half number of cylinders to the open air without guiding it to a turbocharger in order to prevent any adverse influence from being exercised on an engine by the increase of an exhaust pressure during high load running of a multicylinder engine having a turbocharger. CONSTITUTION:Exhaust gas from two cylinders of an engine 1 is fed to a turbocharger 3 through an exhaust flow passage 11 to cause a compressor 32 to perform compression operation. Exhaust gas from other two cylinders is guided to an exhaust gas flow passage 12 having first and second valves 4 and 5, being a flow passage switching means. During high load and high rotation operation of an engine, air is not fed to the turbocharger 3 but fed to an exhaust port 33 to discharge it to the open air.