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

A work vehicle, comprising:

• a chassis;
• a drive assembly supported on the chassis;
• a power system supported on the chassis and configured to power the drive assembly, the power system comprising:
• an intake arrangement configured to intake charge air;
• and
• a compression ignition engine including a plurality of piston-cylinder sets configured to receive, ignite, and combust intake gas that includes the charge air from the intake arrangement to generate mechanical power and exhaust gas, wherein each of the piston-cylinder sets includes:
• a cylinder defining an intake port and an exhaust port;
• a piston positioned at least partially within the cylinder to form a combustion chamber in between, the combustion chamber being in fluid communication with the intake port and the exhaust port;
• an intake valve configured to open and close the intake port;
• an exhaust valve configured to open and close the exhaust port;
• and
• a fuel injector configured to inject fuel into the combustion chamber;
• and
• a controller coupled 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 the 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 in order to create thermally stratified layers of intake gas and exhaust gas within the combustion chamber.