Method of operating a hybrid ammonia-diesel compression ignition propulsion system and/or power generation system and controlling the power output and emissions thereof

A method of forming and using a compression ignition engine system, the method comprising the steps of:

• providing that the compression ignition engine system includes a compression ignition engine, which is configured for using ammonia as a primary fuel source and a compression ignition engine fuel as a secondary fuel source;
• operatively coupling a control system with the compression ignition engine;
• and
• controlling, at least partially, a use of the ammonia and the compression ignition engine fuel by the compression ignition engine, the compression ignition engine system having an absence of an exhaust gas recirculation system or an absence of an exhaust gas recirculation system that functions.