Engine exhaust gas recirculation system

An exhaust gas recirculation system for a multi-cylinder engine, comprising:

• an exhaust manifold connected to a cylinder head of the engine and configured to collect exhaust gas discharged from each cylinder of the engine;
• a catalyst connected to a downstream end of the exhaust manifold with respect to an exhaust gas flow and configured to purify the exhaust gas;
• an exhaust gas recirculation (EGR) gas outlet provided downstream of the catalyst and configured to take out part of the exhaust gas as EGR gas to be recirculated to an intake side of the engine;
• an in-head EGR passage penetrating the cylinder head and through which the EGR gas passes;
• and
• an EGR pipe extending from the EGR gas outlet and configured to lead the EGR gas to the in-head EGR passage,
• wherein the catalyst is disposed so that the exhaust gas flows inside the catalyst from a first side to a second side in a cylinder lined-up direction of the engine,
• wherein the EGR gas outlet is located on the second side with respect to the center of the engine in the cylinder lined-up direction,
• wherein an inlet of the in-head EGR passage is located in the first side with respect to the center of the engine in the cylinder lined-up direction, and
• wherein the EGR pipe extending from the EGR gas outlet is directly connected to the inlet of the in-head EGR passage.