Exhaust gas purifying device for internal combustion engine with auxiliary combustion chamber

摘要

A recirculating and recombustion type of exhaust gas purification system for a compression ignition engine includes an expansion manifold communicating with auxiliary combustion chambers of each cylinder through separate passages. Cam operated valves are located in each of the separate passages. The exhaust gas in an auxiliary combustion chamber is expanded into the manifold through one of the cam operated valves and is then drawn into the auxiliary combustion chamber of another cylinder whose piston is near the bottom of its intake or suction stroke via another open cam operated valve. The thus recirculated or transferred exhaust gas is cooled by its expansion into the manifold, water jacketing within the cylinder head and air surrounding the exposed periphery. Further, in high load operation of the engine, a single butterfly valve disposed midway of the expansion manifold can control the amount of the exhaust gas circulation to improve the engine operation.