US 12,006,884 B1
Split cycle waste heat method for combustion initiation in gasoline compression ignition engine
Mark Shirley, Albion, MI (US); Nicholas Fantin, Ann Arbor, MI (US); Shengrong Zhu, Ann Arbor, MI (US); Kyoung Pyo Ha, Gyeonggi-do (KR); Jeffrey Hollowell, Commerce, MI (US); and Nahm Roh Joo, Gyeonggi-do (KR)
Assigned to Hyundai Motor Company, Seoul (KR); and Kia Corporation, Seoul (KR)
Filed by Hyundai Motor Company, Seoul (KR); and Kia Corporation, Seoul (KR)
Filed on Mar. 2, 2023, as Appl. No. 18/177,527.
Int. Cl. F02D 41/30 (2006.01); F02D 13/02 (2006.01); F02D 41/00 (2006.01); F02D 41/06 (2006.01)
CPC F02D 13/0215 (2013.01) [F02D 41/008 (2013.01); F02D 41/064 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for transitioning an engine from a Low temperature Combustion (LTC) mode to a Gasoline Compression Ignition (GCI) mode, comprising:
performing a cold start on an engine, wherein:
the engine comprises at least two sets of cylinders, wherein each set of cylinders comprises a two-cylinder pair of cylinders, and
each pair of cylinders is capable of differing camshaft operating points, consisting of identical cam lob shapes with discrete control mechanisms consisting of a CVVD mechanism on each discrete pair of cylinders, and a discrete CVVT system on each discrete pair of cylinders,
performing the cold start comprises running all of the at least two sets of cylinders in a Spark Ignition (SI) mode; and
using a discrete camshaft operation for a different pair of combustion cylinders to run all of the at least two sets of cylinders in a LTC mode:
when a load operation point of the engine increases:
transitioning a first set of cylinders, of the at least two sets of cylinders, to run in a SI mode; and
after the first set of cylinders is transitioned to run in the SI mode, transitioning a second set of cylinders, of the at least two sets of cylinders, to run in the GCI mode; and
after the second set of cylinders are transitioned to run in the GCI mode:
transitioning the first set of cylinders to run in a GCI mode.