METHOD AND SYSTEMS FOR EGR CONTROL

Various methods and systems are provided for controlling exhaust gas recirculation in an engine 104. One embodiment for a system comprises an engine having first and second cylinder groups 105,107, and an exhaust gas recirculation (EGR) passage 162 coupled between the first cylinder group and an intake manifold of the engine, flow of EGR through the EGR passage 162 controlled by one or more EGR exhaust valves 163, and a controller 180 configured to maintain a target intake gas concentration by adjusting the one or more EGR exhaust valves 163 and adjusting fuel injection amounts to the first cylinder group differently than the second cylinder group.