Adaptive individual-cylinder thermal state control using piston cooling for a GDCI engine

A control system for a multi-cylinder compression ignition engine, said engine defining a plurality of cylinders and having a plurality of pistons, each cylinder having a piston reciprocally movable in the cylinder, each piston having a top side and a bottom side, the top side of the piston partially defining a combustion chamber having an air intake port and an exhaust port, the system comprising:

• an oil path supplying oil to the engine;
• a nozzle means comprising a plurality of nozzles, each of the plurality of nozzles connected to said oil path and configured to spray oil onto the bottom side of one piston of the plurality of pistons;
• a valve means configured to control the flow of oil from the oil path to the nozzle means;
• a sensor means for sensing and/or calculating a combustion parameter for combustion occurring in each individual cylinder of the plurality of cylinders;
• and
• a controller means configured to calculate a desired oil flow from each nozzle of the plurality of nozzles based on the combustion parameter for combustion occurring in the cylinder containing the piston onto which the nozzle is configured to spray oil, said controller means further configured to control said valve means to adjust the flow rate from each nozzle of the plurality of nozzles based on the calculated desired oil flow from the nozzle.