1. A method for controlling a percentage of exhaust gas recirculation in a turbocharged engine system, comprising: controlling an exhaust gas recirculation valve to: direct one portion of an exhaust flow from a set of predetermined cylinders among a plurality of cylinders of the engine through an exhaust gas recirculation system to an intake manifold of an engine; direct another portion of the exhaust flow from the set of predetermined cylinders among the plurality of cylinders of the engine through an exhaust gas recirculation system to an exhaust manifold of the engine; wherein a percentage of the other portion of the exhaust flow through the exhaust gas recirculation system is controlled via a controller as a function of pressure ratio of a turboexpander of the exhaust gas recirculation system, speed of the turboexpander, or combinations thereof detected via sensors.