Abstract: Operating a gaseous fuel engine system includes opening and closing two intake valves for each of a plurality of intake ports to fluidly connect the intake ports to cylinders in an engine via two intake valve openings. Pressurized intake air is fed through each of the intake ports so as to define flow streamlines extending to inward sides of the respective two intake valve openings. Gaseous fuel admitted to each of the plurality of intake ports is advanced into cylinders in an engine in a manner proportionally concentrated around the respective flow streamlines. When advanced into the cylinders the gaseous fuel may be biased in distribution away from cylinder walls thereof. In an embodiment the gaseous fuel includes a gaseous hydrogen fuel. Related apparatus is also disclosed.

Abstract: Operating an engine includes energizing an electrical actuator for a valve in a fuel injector according to a waveform alternating a plurality of on-times with a plurality of dwell times, and outputting a pulsed injection of a gaseous hydrogen fuel from the fuel injector entraining air between pulses of the gaseous hydrogen fuel. Entrainment breaks are produced between the plurality of pulses in a spray cone of the pulsed injection. The gaseous hydrogen fuel and air experience enhanced in-cylinder mixing based upon the air entrainment. Related apparatus is also disclosed.

Abstract: An engine system includes an engine housing including a plurality of intake valve openings, an intake port extending to the plurality of intake valve openings and an injector bore extending to the intake port. The engine system also includes a fuel system having a port fuel injector, and a fuel distributor having a baffle wall. The baffle wall extends into the intake port and extends at least partially around a fuel spray axis, forming a fuel channel and having at least one of a circumferentially varied porosity or an axially varied cross sectional area. The baffle wall shields fuel spray of an injected fuel such as methanol to limit a bias in distribution of fuel among the plurality of intake valve openings.

Abstract: An engine system includes an engine housing having an intake port to convey an incoming flow of intake air to a first intake valve opening and a second intake valve opening located downstream of the first intake valve opening. A port fuel injector assembly is supported in the engine housing and includes a fuel injector within a sleeve and an outwardly opening fuel injection valve. The sleeve includes a fuel-directing cap extending into the intake port and forming a fuel injection opening defining an outgoing fuel path axis oriented at a fuel exit angle, to improve distribution of a gaseous fuel such as a gaseous hydrogen fuel to the respective intake valve openings for mixing and combustion in an engine cylinder. Related apparatus of a port fuel injector assembly and methodology is also disclosed.

Abstract: Operating an engine includes energizing an electrical actuator for a valve in a fuel injector according to a waveform alternating a plurality of on-times with a plurality of dwell times, and outputting a pulsed injection of a gaseous hydrogen fuel from the fuel injector entraining air between pulses of the gaseous hydrogen fuel. Entrainment breaks are produced between the plurality of pulses in a spray cone of the pulsed injection. The gaseous hydrogen fuel and air experience enhanced in-cylinder mixing based upon the air entrainment. Related apparatus is also disclosed.

Abstract: A dual fuel, internal combustion engine system is described herein. The system uses in-cylinder pressure detectors to determine the combustion quality in a particular cylinder. The fuel controller commences a remediation process when a detected pressure indicates or is calculated indicating that an out-of-range pressure-based combustion characteristic is present. A remediation process may be to change the timing of the fuel injectors. The fuel controller can increase or decrease the time a fuel injector for a primary fuel or a pilot fuel is open, making adjustments until the out-of-range pressure-based combustion characteristic is cleared. In another example, the fuel controller can modify the amount of pilot fuel produced and/or the ratio of the pilot fuel to methanol/water in the reactor product can be modified to attempt to clear the out-of-range pressure-based combustion characteristic.

Abstract: An engine system operating and control strategy includes autoigniting a directly injected pilot fuel to ignite a primary fuel in a cylinder in a first engine cycle. The strategy further includes comparing data indicative of a heat release in a cylinder in the first engine cycle to phasing error criteria for an earlier pilot shot of the pilot fuel and a later shot of the pilot fuel. A quantity of one or more pilot shots in a subsequent engine cycle is varied, based on the comparison. Pilot shot quantity can be varied closed loop to obtain desired combustion phasing characteristics, such as when a characteristic of a primary fuel is changed during operation. Related apparatus and control logic is also disclosed.

Abstract: An engine system includes an engine housing forming a plurality of intake ports, and a plurality of fuel admission tubes each forming a fuel passage and at least one mixing air opening fluidly connected to the fuel passage between a first tube end and a terminal end surface of a second tube end. The mixing air opening may be formed in an end cap of the fuel admission tube. A plurality of mixing air openings in a fuel admission tube may have at least one of a circumferential distribution or an axial distribution that is biased in a direction of an incoming flow of intake air. Related apparatus and methodology is also disclosed.

Abstract: An engine system includes an engine housing forming a plurality of intake ports, and a plurality of fuel admission tubes each forming a fuel passage and at least one mixing air opening fluidly connected to the fuel passage between a first tube end and a terminal end surface of a second tube end. The mixing air opening may be formed in an end cap of the fuel admission tube. A plurality of mixing air openings in a fuel admission tube may have at least one of a circumferential distribution or an axial distribution that is biased in a direction of an incoming flow of intake air. Related apparatus and methodology is also disclosed.

Abstract: An internal combustion engine system is described herein. The system uses a pilot fuel to assist in the ignition of the primary fuel or uses a pilot fuel rather than a primary fuel in some instances. The pilot fuel is stored in one or more pilot fuel storage tanks that are actively managed to maintain a desired physical state of the pilot fuel stored in the one or more storage tanks. A controller detects conditions within the one or more pilot fuel storage tanks and issues control commands depending on the detected conditions. The conditions can include a temperature, a pressure, or a level of the pilot fuel stored in the pilot fuel storage tanks.

Abstract: An engine system includes an engine housing having an intake port to convey an incoming flow of intake air to a first intake valve opening and a second intake valve opening located downstream of the first intake valve opening. A port fuel injector assembly is supported in the engine housing and includes a fuel injector within a sleeve and an outwardly opening fuel injection valve. The sleeve includes a fuel-directing cap extending into the intake port and forming a fuel injection opening defining an outgoing fuel path axis oriented at a fuel exit angle, to improve distribution of a gaseous fuel such as a gaseous hydrogen fuel to the respective intake valve openings for mixing and combustion in an engine cylinder. Related apparatus of a port fuel injector assembly and methodology is also disclosed.

Abstract: An engine system operating and control strategy includes autoigniting a directly injected pilot fuel to ignite a primary fuel in a cylinder in a first engine cycle. The strategy further includes comparing data indicative of a heat release in a cylinder in the first engine cycle to phasing error criteria for an earlier pilot shot of the pilot fuel and a later shot of the pilot fuel. A quantity of one or more pilot shots in a subsequent engine cycle is varied, based on the comparison. Pilot shot quantity can be varied closed loop to obtain desired combustion phasing characteristics, such as when a characteristic of a primary fuel is changed during operation. Related apparatus and control logic is also disclosed.

Abstract: An engine system includes an engine housing including a plurality of intake valve openings, an intake port extending to the plurality of intake valve openings and an injector bore extending to the intake port. The engine system also includes a fuel system having a port fuel injector, and a fuel distributor having a baffle wall. The baffle wall extends into the intake port and extends at least partially around a fuel spray axis, forming a fuel channel and having at least one of a circumferentially varied porosity or an axially varied cross sectional area. The baffle wall shields fuel spray of an injected fuel such as methanol to limit a bias in distribution of fuel among the plurality of intake valve openings.

Abstract: Operating a hybrid power system for a machine includes combusting a direct injected gaseous hydrogen fuel in an engine operating an electrical generator, and increasing a load demand of the hybrid power system. Operating the hybrid power system further includes operating an electrical-assist compressor to supply an increased airflow into the engine based on an increased engine power demand to satisfy the increased load demand. Air-fuel equivalence ratio of the engine (so-called “lambda”) is maintained at a ratio of about 2 or greater to limit NOx emissions, and between a hydrogen fuel misfire limit and a hydrogen fuel preignition limit. Related apparatus and control logic is also disclosed.

Abstract: Operating an engine system includes calculating a crank angle timing term corresponding to an in-cylinder temperature sufficient for autoignition of a first fuel injected at a first injection location. Operating an engine system further includes calculating, based on the crank angle timing term, at least one of an injection amount or an injection duration, to increase the in-cylinder temperature sufficiently via burning of the first fuel to ignite a second fuel injected into a mixture of the first fuel and pressurized intake air. The first fuel may include a blend of dimethyl ether (DME), methanol (MeOH), and water. Based on expected progression of in-cylinder temperatures, and fuel injection amount and/or duration based thereon, desirable controllability of combustion phasing and/or other combustion properties may be realized.

Abstract: Operating a hybrid power system for a machine includes combusting a direct injected gaseous hydrogen fuel in an engine operating an electrical generator, and increasing a load demand of the hybrid power system. Operating the hybrid power system further includes operating an electrical-assist compressor to supply an increased airflow into the engine based on an increased engine power demand to satisfy the increased load demand. Air-fuel equivalence ratio of the engine (so-called “lambda”) is maintained at a ratio of about 2 or greater to limit NOx emissions, and between a hydrogen fuel misfire limit and a hydrogen fuel preignition limit. Related apparatus and control logic is also disclosed.

Abstract: An engine includes a piston movable in a cylinder and having a combustion bowl, and an annular rim forming a scoop extending axisymmetrically around a piston center axis. A fuel injector tip extends into the cylinder and includes a first orifice set and a second orifice set offset from one another and offset from the piston center axis. A plurality of orifice-rim distances are defined between orifices in the second orifice set and an annular rim of the piston. The orifices in the second orifice set having a range of orifice sizes varied in direct relation to the respective orifice-rim distances. Related methodology is also disclosed.

Abstract: A gaseous fuel engine includes an engine housing having a cylinder block with a combustion cylinder therein, and an engine head including an intake port, an exhaust port, a fuel port, and an igniter bore, each extending to a fire deck. The gaseous fuel engine includes a fuel admission valve movable to close and open the fuel port. A non-axisymmetric clearance is defined between an inner port surface and the fuel admission valve and directionally biases a flow of gaseous fuel from the fuel port. Related methodology is also disclosed.

Abstract: Operating an engine system includes autoigniting a first fuel including a plurality of liquid fuels premixed with air, to trigger ignition of a direct-injected main fuel in a first engine cycle, and receiving data indicative of an undesired heat release of combustion of the first fuel. The undesired heat release may include an undesired heat release rate (HRR) modality such as a multistage combustion. Relative amounts of the plurality of the liquid fuels are varied and admitted to the cylinder in a second engine cycle, and the first fuel having the varied relative amounts autoignited to trigger ignition of the direct-injected main fuel in the second engine cycle. The undesired heat release can be limited in the second engine cycle based on the varied relative amounts of the liquid fuels. The first fuel may include a blend of dimethyl ether (DME), methanol (MeOH), and water. The direct-injected main fuel may include MeOH and water. Related apparatus and control logic is also disclosed.

Abstract: An engine includes a piston movable in a cylinder and having a combustion bowl, and an annular rim forming a scoop extending axisymmetrically around a piston center axis. A fuel injector tip extends into the cylinder and includes a first orifice set and a second orifice set offset from one another and offset from the piston center axis. A plurality of orifice-rim distances are defined between orifices in the second orifice set and an annular rim of the piston. The orifices in the second orifice set having a range of orifice sizes varied in direct relation to the respective orifice-rim distances. Related methodology is also disclosed.