Work vehicle compression ignition power system having thermally stratified engine combustion chambers

A work vehicle, comprising:

• a chassis;
• a compression ignition engine supported by the chassis and including a plurality of piston-cylinder sets with an intake port and intake valve and with an exhaust port an exhaust valve and a piston positioned at least partially within a cylinder to form a combustion chamber in communication with the intake port and the exhaust port;
• and
• an engine control system for the compression ignition engine, the engine control system having processing architecture executing programmed instructions to selectively command the intake valve and the exhaust valve such that:
• during an exhaust stroke of the piston, the exhaust valve is opened to enable exhaust gas to flow out of the combustion chamber;
• during an initial portion of an intake stroke of the piston, the intake valve is opened to enable intake air to flow into the combustion chamber;
• and
• during a further portion of the intake stroke of the piston, the intake valve is closed and the exhaust valve is opened to enable a portion of the exhaust gas to flow back into the combustion chamber to create thermally stratified layers of intake gas and exhaust gas within the combustion chamber.