Patent ID: 11959435
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A method, comprising:
operating an engine in a first engine operating map region and a second engine operating map region by performing passive jet ignition combustion with a first stoichiometric fuel mixture and a first volume of residual gas;
operating the engine in a mode transition region by performing passive jet ignition combustion with a second stoichiometric fuel mixture and a second volume of residual gas,
wherein the second volume of residual gas is controlled by an ignition timing chosen to meet a target engine load;
operating the engine in a third engine operating map region by performing turbulent jet controlled compression ignition (TJCCI) with an ultra lean fuel mixture and a first volume of cooled exhaust gas recirculation;
operating the engine in the mode transition region;
operating the engine in a fourth engine operating map region by performing passive jet ignition combustion with a third stoichiometric fuel mixture and a second volume of cooled exhaust gas recirculation; and
operating the engine in a fifth engine operating map region, wherein the fifth engine operating map region is characterized by shutting off the engine,
wherein the engine has a cycle spanning two revolutions of a piston within the engine, and
wherein the cycle comprises:
an exhaust stroke, an intake stroke, a compression stroke, and an expansion stroke;
a gas exchange top dead center piston position located between the exhaust stroke and the intake stroke;
a firing top dead center piston position located between the compression stroke and the expansion stroke; and
a bottom dead center piston position located between the intake stroke and the compression stroke and between the expansion stroke and the exhaust stroke.