US 12,345,220 B1
Air-handling system for fuel-efficient low load thermal promotion and high load operation for heavy duty engines
Praveen Kumar, New Hudson, MI (US); Yu Zhang, Novi, MI (US); and David Cleary, West Bloomfield, MI (US)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by ARAMCO SERVICES COMPANY, Houston, TX (US)
Filed on Dec. 29, 2023, as Appl. No. 18/400,474.
Int. Cl. F02M 26/01 (2016.01); F02B 37/00 (2006.01); F02B 37/12 (2006.01); F02B 37/22 (2006.01); F02M 26/04 (2016.01); F02M 26/05 (2016.01); F02M 26/00 (2016.01)
CPC F02M 26/04 (2016.02) [F02B 37/00 (2013.01); F02B 37/12 (2013.01); F02B 37/22 (2013.01); F02M 26/01 (2016.02); F02M 26/05 (2016.02); F01N 2260/14 (2013.01); F02M 2026/004 (2016.02)] 19 Claims
OG exemplary drawing
 
1. An exhaust gas rebreather system, comprising:
a main exhaust gas outlet configured to receive an exhaust gas from an engine, the engine having a plurality of cylinders, a camshaft having a single cam profile in the absence of a variable valvetrain mechanism, and a gas intake manifold for providing an air inlet to the engine;
an exhaust gas rebreather line configured to return at least a portion of the exhaust gas in the main exhaust gas outlet to the gas intake manifold;
a variable nozzle turbocharger in fluid connection with the main exhaust gas outlet, the variable nozzle turbocharger comprising one or more variable nozzle vanes;
an exhaust gas recirculation valve disposed in the exhaust gas rebreather line and in fluid connection with the main exhaust gas outlet;
a back pressure valve downstream of the variable nozzle turbocharger; and
at least one temperature sensor disposed proximate to the main exhaust gas outlet,
wherein the one or more variable nozzle vanes is configured to at least partially close in response to a temperature threshold indicated by the at least one temperature sensor.