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公开(公告)号：US11815054B2
公开(公告)日：2023-11-14
申请号：US17831668
申请日：2022-06-03
申请人： Caterpillar Inc.
CPC分类号： F02M43/04 , F02D19/0694 , F02D19/0649 , F02D19/10 , F02M47/027 , F02M2200/46
摘要： A dual fuel system for an internal combustion engine includes a first fuel supply of a liquid pilot fuel, a primary fuel supply of a liquid primary fuel, and a dual fuel injector. The dual fuel injector includes a spill valve fluidly connected with a plunger cavity and movable to control a start of injection and an end of injection, and an admission valve. The admission valve is movable to admit a pilot fuel into the fuel injector, such that the pilot fuel is conveyed through an outlet check to form, within a primary fuel passage fluidly connected to the plunger cavity, a segmented fuel charge of leading pilot fuel and trailing primary fuel by displacing some of the primary fuel. The liquid pilot fuel may be a higher cetane/lower octane liquid fuel, and the primary fuel may be a lower cetane/higher octane liquid fuel.
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公开(公告)号：US11454179B2
公开(公告)日：2022-09-27
申请号：US16990075
申请日：2020-08-11
申请人： Caterpillar Inc.
摘要： An engine brake controller may obtain a performance characteristic of an engine. The engine brake controller may determine, based on the performance characteristic of the engine, that engine braking is enabled to control the engine. The engine brake controller may monitor a set of operating parameters of the engine. The engine brake controller may determine that operating values of the set of operating parameters satisfy corresponding thresholds of the set of operating parameters. The engine brake controller may determine, based on the operating values satisfying the corresponding thresholds, an engine braking configuration associated with activating engine braking of a set of cylinders of the engine. The set of cylinders may be a proper subset of a total quantity of cylinders of the engine. The engine brake controller may cause the engine braking to be applied to the set of cylinders to increase a temperature of exhaust gas from the engine.
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公开(公告)号：US12129807B2
公开(公告)日：2024-10-29
申请号：US17737528
申请日：2022-05-05
申请人： Caterpillar Inc.
CPC分类号： F02D41/0027 , F02D19/0644 , F02D19/081 , F02D41/1452 , F02D41/1406
摘要： Operating an engine system includes combusting a gaseous hydrogen fuel (H2) and a gaseous hydrocarbon fuel (HC) at a first substitution ratio in a cylinder in an engine, determining at least one of an H2 fueling command or an HC fueling command based on an H2 availability input and an H2 cost, and outputting the H2 fueling command and the HC fueling command to an H2 injector and an HC admission valve, respectively. Operating the engine system further includes combusting H2 and HC at a varied substitution ratio based on the H2 fueling command and the HC fueling command. At least one of the H2 fueling command or the HC fueling command may be based on a monitored CO2 exhaust level which may be used to populate a stored history of CO2 output.
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公开(公告)号：US20240141857A1
公开(公告)日：2024-05-02
申请号：US18049719
申请日：2022-10-26
申请人： Caterpillar Inc.
CPC分类号： F02M55/025 , F02D19/0613 , F02D19/0694
摘要： An internal combustion engine system is described herein. The system uses a switching rail in combination with a first fuel rail to operate the internal combustion engine of the system. The first fuel rail receives the first fuel for combustion within one or more of the combustion cylinders of the internal combustion engine. The switching rails are configured to receive either the first fuel or a second fuel. A controller is used to operate a switching valve that, depending on the position of the switching valve, routes or directs either the second fuel or the first fuel from their respective fuel tanks. In a switching condition, such as startup, shutdown, or when the second fuel is not available, the controller can use the first fuel as the alternate source of fuel provided through the switching rail.
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5.发明公开公开(公告)号：US20240044296A1
公开(公告)日：2024-02-08
申请号：US17879978
申请日：2022-08-03
申请人： Caterpillar Inc.
CPC分类号： F02D19/021 , F02D41/30
摘要： Operating a gaseous fuel engine system includes controlling at least one of a delivery location, a delivery timing, or in situ mixing of a gaseous fuel with air, based on at least one engine system parameter upon the basis of which a blowby amount of a gaseous fuel to a crankcase varies. Crankcase accumulation of the gaseous fuel is maintained below a flammability limit. Related apparatus and control logic is also disclosed.
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公开(公告)号：US20230265777A1
公开(公告)日：2023-08-24
申请号：US17675151
申请日：2022-02-18
申请人： Caterpillar Inc.
CPC分类号： F01P3/08 , F02B43/12 , F01M1/02 , F01P7/14 , F01P2003/006
摘要： Operating a gaseous fuel engine system includes combusting a mixture containing a gaseous hydrogen fuel and air in a cylinder of an engine, varying an operating parameter of the engine to which a crown surface temperature of a piston within the cylinder is responsive, and populating a temperature model based on a value of the varied operating parameter. Operating a gaseous fuel engine system further includes operating an oil spray apparatus to spray oil onto the piston based on the populated temperature model, and maintaining the crown surface temperature of the piston between a high temperature limit and a pre-ignition mitigation temperature limit based on the operating of the oil spray apparatus. Related apparatus and control logic is also disclosed.
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公开(公告)号：US11480115B1
公开(公告)日：2022-10-25
申请号：US17494099
申请日：2021-10-05
申请人： Caterpillar Inc.
摘要： A method of operating a dual fuel engine includes conveying intake air, and a first fuel as a vapor and as a liquid, into a combustion cylinder in an engine, and directly injecting a second fuel into the combustion cylinder to form a first combustion charge of the first fuel as a vapor and as a liquid, the second fuel, and intake air. The second fuel is ignited to initiate combustion of the first combustion charge. Operating the dual fuel engine further includes varying at least one of, a vapor proportion of the first fuel or a total proportion of the first fuel, in a subsequent combustion charge to mitigate undesired combustion. The first fuel can include a liquid alcohol fuel. The second fuel can include a liquid compression-ignition fuel. Related apparatus and control logic is also disclosed.
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公开(公告)号：US12085050B2
公开(公告)日：2024-09-10
申请号：US18049719
申请日：2022-10-26
申请人： Caterpillar Inc.
CPC分类号： F02M55/025 , F02D19/0613 , F02D19/0694
摘要： An internal combustion engine system is described herein. The system uses a switching rail in combination with a first fuel rail to operate the internal combustion engine of the system. The first fuel rail receives the first fuel for combustion within one or more of the combustion cylinders of the internal combustion engine. The switching rails are configured to receive either the first fuel or a second fuel. A controller is used to operate a switching valve that, depending on the position of the switching valve, routes or directs either the second fuel or the first fuel from their respective fuel tanks. In a switching condition, such as startup, shutdown, or when the second fuel is not available, the controller can use the first fuel as the alternate source of fuel provided through the switching rail.
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公开(公告)号：US12006856B1
公开(公告)日：2024-06-11
申请号：US18319239
申请日：2023-05-17
申请人： Caterpillar Inc.
发明人： Joshua Lynn Ratts , Abhay Gupta , Arnold Myoungjin Kim , Eric Lee Schroeder , Kenth I. Svensson
CPC分类号： F01N3/208 , B01D53/9431 , B01D53/9477 , B01D53/9495 , F01N3/106 , F01N3/2803 , F01N3/2892 , B01D2251/2062 , B01D2255/102 , B01D2255/904 , F01N2370/02 , F01N2610/03 , F01N2610/05 , F01N2900/1402
摘要： An internal combustion engine system is described herein. The system uses an additive added to the exhaust of the internal combustion engine to maintain a range of NO2 to NO within a range that provides for a fast SCR reaction in a selective catalyst reduction unit. The additive and the exhaust enter a diesel oxidation catalyst (DOC), whereby the NO2 undergoes a two-stage process. In the first stage, the NO2 from the exhaust is adsorbed onto the precious metal catalyst of the DOC and an atomic oxygen is removed from the NO2, reducing the NO2 to NO. Because of the higher reactivity of the additive, the additive scavenges a portion of the atomic oxygen from the catalyst. During the second stage of the DOC process, the NO is oxidized over the catalyst to form NO2.
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公开(公告)号：US20220243691A1
公开(公告)日：2022-08-04
申请号：US17167211
申请日：2021-02-04
申请人： Caterpillar Inc.
摘要： A dual fuel system for an internal combustion engine includes a first fuel supply of a liquid pilot fuel, a primary fuel supply of a liquid primary fuel, and a dual fuel injector. The dual fuel injector includes a spill valve fluidly connected with a plunger cavity and movable to control a start of injection and an end of injection, and an admission valve. The admission valve is movable to admit a pilot fuel into the fuel injector, such that the pilot fuel is conveyed through an outlet check to form, within a primary fuel passage fluidly connected to the plunger cavity, a segmented fuel charge of leading pilot fuel and trailing primary fuel by displacing some of the primary fuel. The liquid pilot fuel may be a higher cetane/lower octane liquid fuel, and the primary fuel may be a lower cetane/higher octane liquid fuel.
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