US 12,320,310 B2
Work vehicle compression ignition power system having thermally stratified engine combustion chambers
Craig W. Lohmann, Cedar Falls, IA (US)
Assigned to DEERE & COMPANY, Moline, IL (US)
Filed by Deere & Company, Moline, IL (US)
Filed on Oct. 31, 2022, as Appl. No. 17/977,016.
Prior Publication US 2024/0141844 A1, May 2, 2024
Int. Cl. F02D 41/00 (2006.01); F02D 13/02 (2006.01); F02M 26/00 (2016.01); F02M 26/01 (2016.01); F02M 26/03 (2016.01); F02M 26/04 (2016.01); F02M 26/10 (2016.01); F02M 26/30 (2016.01)
CPC F02D 41/006 (2013.01) [F02D 13/0269 (2013.01); F02D 13/0273 (2013.01); F02M 26/01 (2016.02); F02M 26/03 (2016.02); F02M 26/04 (2016.02); F02M 26/10 (2016.02); F02M 26/30 (2016.02); F01L 2800/10 (2013.01); F02M 2026/002 (2016.02); F02M 2700/31 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power system for a work vehicle, comprising:
an intake arrangement configured to intake charge air;
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, 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 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 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.