Global and individual cylinder control in engine system

A method of operating a reciprocating engine system, comprising:

• adjusting a pilot fuel injection timing through a fuel injector based on a heat release rate of a cylinder of the reciprocating engine system;
• adjusting an exhaust gas recirculation (EGR) flow to the cylinder based on a NOx level as measured in an exhaust line of the reciprocating engine system with a NOx/O2 sensor;
• and
• adjusting an air-to-fuel equivalence ratio based on one or more of:
• a fuel dilution;
• or
• the pilot fuel injection timing.

A dual fuel engine system comprising:

• a fuel supply;
• an engine including one or more cylinders configured to receive fuel from the fuel supply;
• an engine position sensor;
• an exhaust including:
• an exhaust gas recirculation (EGR) line for adjusting an EGR flow to the one or more cylinders;
• a NOx/O2 sensor;
• an exhaust temperature sensor;
• and
• an air supply configured to supply air to the one or more cylinders;
• and
• a controller comprising a processor and one or more memories storing instructions that, when executed by the processor, cause the system to:
• adjust pilot fuel injection timing to maintain a target heat release rate from each of the one or more cylinders individually based on a heat release rate of the one or more cylinders;
• adjust an EGR flow to the one or more cylinders based on NOx measured with the NOx/O2 sensor;
• adjust an air-to-fuel equivalence ratio based on one or more of:
• a fuel dilution;
• or
• the pilot fuel injection timing.