An exhaust gas recirculation system. A water jacket in a cylinder block is
configured for coolant to flow therein. A cylinder head is attached to
the cylinder block. A cylinder is disposed in the cylinder block and the
cylinder head. An intake manifold runner is connected to an intake hole
of the cylinder. An exhaust manifold runner is connected to an exhaust
hole of the cylinder. A first recirculation gas pathway is disposed in
the cylinder block, and receives recirculated exhaust gas from the
exhaust manifold runner. A second recirculation gas pathway is disposed
in the cylinder head, and has a first end connected to the first
recirculation gas pathway and a second end connected to the intake
manifold runner. A recirculation valve, mounted at the second
recirculation gas pathway, controls supply of the recirculated exhaust
gas to the intake manifold runner. An engine control unit controls the
recirculation valve.