US 12,215,639 B1
Dual fuel operating strategy for engine based on expected in-cylinder temperature progression
Kenth I. Svensson, Peoria, IL (US); Jonathan W. Anders, Peoria, IL (US); and Yongli Qi, Peoria, IL (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Peoria, IL (US)
Filed on Nov. 20, 2023, as Appl. No. 18/513,760.
Int. Cl. F02D 19/06 (2006.01); F02D 13/02 (2006.01); F02D 41/00 (2006.01)
CPC F02D 19/0602 (2013.01) [F02D 13/0242 (2013.01); F02D 19/0689 (2013.01); F02D 41/0002 (2013.01); F02D 41/009 (2013.01); F02D 2041/001 (2013.01); F02D 2200/023 (2013.01); F02D 2200/024 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of operating an engine system comprising:
injecting a first fuel in a first fuel injection at a first injection location of an engine system into a feed of pressurized intake air;
injecting a second fuel in a second fuel injection at a second injection location of the engine system into a mixture of the first fuel and the pressurized intake air;
calculating a crank angle timing term corresponding to an in-cylinder temperature sufficient for autoignition of the first fuel;
calculating, based on the crank angle timing term, at least one of an injection amount or an injection duration of the first fuel injection, to increase the in-cylinder temperature sufficiently via burning of the first fuel to ignite the second fuel; and
combusting the first fuel and the second fuel in a combustion cylinder in the engine system in an engine cycle.