WO2015066674A1 - Systèmes et procédés de commande de combustible d'un ou de plusieurs cylindres egr - Google Patents

Systèmes et procédés de commande de combustible d'un ou de plusieurs cylindres egr Download PDF

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Publication number
WO2015066674A1
WO2015066674A1 PCT/US2014/063806 US2014063806W WO2015066674A1 WO 2015066674 A1 WO2015066674 A1 WO 2015066674A1 US 2014063806 W US2014063806 W US 2014063806W WO 2015066674 A1 WO2015066674 A1 WO 2015066674A1
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WO
WIPO (PCT)
Prior art keywords
egr
dedicated
cylinders
fuelling
dedicated egr
Prior art date
Application number
PCT/US2014/063806
Other languages
English (en)
Inventor
Marten H. Dane
Original Assignee
Cummins Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cummins Inc. filed Critical Cummins Inc.
Publication of WO2015066674A1 publication Critical patent/WO2015066674A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/008—Controlling each cylinder individually
    • F02D41/0087—Selective cylinder activation, i.e. partial cylinder operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0065—Specific aspects of external EGR control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/42—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders
    • F02M26/43—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders in which exhaust from only one cylinder or only a group of cylinders is directed to the intake of the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • This invention relates to an internal combustion engine with at least one dedicated exhaust gas recirculation (EGR) cylinder, and more particularly to fuel control of the at least one dedicated EGR cylinder in response to cylinder deactivation conditions being present or absent.
  • EGR exhaust gas recirculation
  • One or more cylinders in an internal combustion engine can be disabled in order to reduce fuel consumption. This may be accomplished by disabling the cylinder valves, by mechanical disablement, or by modifying a variable timing/lift completely eliminate the lift of one exhaust valve.
  • Another method of cylinder disablement includes cutting off the supply of fuel to selected cylinders, particularly to save fuel under conditions of light load. The cylinder disablement increases the load on the other cylinders and reduces pumping losses.
  • these cylinder deactivation methods require complicated mechanical interfaces and controls to modify or disable the mechanical components of the cylinders. Complicated air handling plumbing and controls are required to re-direct the exhaust flow from the exhaust system to maintain proper catalyst functioning. Therefore, improvements in this technology area are needed.
  • One embodiment is a unique system that includes a multi-cylinder, divided exhaust engine configured to control fuelling to at least one dedicated EGR cylinder of the cylinders in response to the presence or absence of cylinder deactivation conditions.
  • the engine includes an exhaust system with an exhaust emission after-treatment device for treatment of exhaust gases from the other of the plurality of cylinders, an air supply system for supplying fresh air to the cylinders, and a fuel supply system for supplying fuel to each cylinder.
  • a controller is configured to cut off or terminate the fuel supply to deactivate the at least one dedicated EGR cylinder in response to EGR cylinder deactivation conditions being present, and to supply fuel to the at least one dedicated EGR cylinder in response to EGR cylinder deactivation conditions being absent.
  • FIG. 1 is a schematic depiction of a system having an internal combustion engine with at least one dedicated EGR cylinder and a fuelling system for providing fuel to the cylinders.
  • FIG. 2 is a flow diagram of a procedure for deactivating one or more dedicated EGR cylinders of an internal combustion engine.
  • a system 100 is depicted having an engine 102.
  • the engine 102 is an internal combustion engine of any type, and can include a stoichiometric engine, a diesel engine, a gasoline engine, and/or a natural gas engine.
  • the engine 102 includes a lean combustion engine such as a lean burn gasoline engine or a diesel cycle engine.
  • the engine 102 may be any engine type producing emissions that may include an exhaust gas recirculation (EGR) system in order to, for example, to reduce NO x emissions from the engine 102.
  • EGR exhaust gas recirculation
  • the engine 102 includes a number of cylinders a, b.
  • the number of cylinders may be any number suitable for an engine, including four or fewer cylinders and eight or more cylinders.
  • the illustrated system 100 includes an inline six cylinder arrangement for illustration purposes only, but other arrangements are also contemplated such as a V-shaped cylinder bank.
  • the engine 102 includes at least one dedicated EGR cylinder b, and other or remaining cylinders a that are non-dedicated EGR cylinders b.
  • Two dedicated EGR cylinders b are shown in Fig. 1.
  • the term dedicated EGR, as utilized herein, should be read broadly. Any EGR arrangement where, during at least certain operating conditions, the entire exhaust output of certain cylinders is recirculated to the engine intake is a dedicated EGR cylinder.
  • a dedicated EGR cylinder typically, at least during certain EGR operations, includes exhaust divided from one or more of the remaining cylinders that are non-dedicated EGR cylinders, has its entire exhaust output recirculated to the intake system, is flow isolated from the exhaust passage, and provides the sole source for recirculated exhaust gas.
  • Non-dedicated EGR cylinders a can be completely flow isolated from the EGR system as shown in the illustrated embodiment, in other embodiments, non-dedicated EGR cylinders a are connected to provide at least some exhaust flow to the EGR system and/or to receive at least some exhaust flow from the EGR system.
  • the EGR flow 108 recirculates in an EGR passage 109 that connects dedicated EGR cylinders b to the intake of engine 102, such as to the intake passage 104, or directly to the intake manifold 105.
  • EGR flow 1 08 combines with intake flow 1 1 8 at a position upstream of an intake manifold 105 or at intake manifold 105 to form a charge flow that is provided to all cylinders a, b from intake manifold 105.
  • Intake manifold 105 is connected to intake passage 104, and intake passage 104 includes an intake throttle 1 07 to regulate the charge flow to both dedicated and non-dedicated cylinders a, b.
  • Intake passage 104 may also include a charge air cooler (not shown) to cool the charge flow provided to intake manifold 105.
  • Intake passage 104 may also include a compressor (not shown) to compress the intake air flow received from an intake air cleaner (not shown.) Embodiments without a compressor and/or charge air cooler are also contemplated.
  • the EGR flow 108 may combine with the intake flow 1 18 at an outlet of EGR passage 109, at a mixer (not shown) provided at the connection with intake passage 104, or by any other arrangement. In certain embodiments, the EGR flow 108 returns to the intake manifold 105 directly.
  • EGR flow 108 mixes with the intake flow 1 18 downstream of throttle 107 so the exhaust pressure on dedicated EGR cylinders b is closely aligned with the intake pressure, which reduces pumping losses on dedicated EGR cylinders b.
  • EGR passage 109 can include an EGR cooler (not shown) and a bypass (not shown) with a valve that selectively allows EGR flow 108 to bypass the EGR cooler. The presence of an EGR cooler and/or an EGR cooler bypass is optional and non-limiting.
  • Non-dedicated EGR cylinders a are connected to an exhaust system that includes an exhaust manifold 130 that receives exhaust gases in the form of an exhaust flow 134 from non-dedicated EGR cylinders a and an exhaust passage 132 that receives exhaust gas from exhaust manifold 130.
  • a turbine (not shown) in exhaust passage 132 is provided that is operable via the exhaust gases to drive a compressor in intake passage 104.
  • Exhaust passage 132 includes an aftertreatment system 138 in exhaust passage 132 that is configured to treat emissions in the exhaust gas.
  • aftertreatment system 138 includes a catalyst, such as a selective catalytic reduction catalyst or a three-way catalyst.
  • Other embodiments contemplate an exhaust throttle (not shown) in the exhaust passage 132.
  • System 100 further includes a fuel system 1 50 that is operable to provide fuel from a fuel storage source 152, such as a fuel tank, to cylinders a, b.
  • the fuel storage source 152 includes, for example, an onboard fuel pump 154 which delivers fuel from the source 152 via a conduit 156 through a filter (not shown) to a common supply rail 158.
  • the common rail 158 feeds fuel via respective fuel lines 160 to a plurality of fuel injectors 162, at least one per cylinder, and in this example, six direct fuel injectors 162.
  • the common rail 158 can also be connected via conduit 156 to a pressure regulator valve 164 which in turn is connected to conduit 166 to vent fuel vapor to the intake passage 104 when the pressure in the rail 158 exceeds a predetermined maximum pressure.
  • the fuel pump 154 is operated through a relay or other suitable connection to controller 140.
  • a direct fuel injector includes any fuel injection device that injects fuel directly into the cylinder volume, and is capable of delivering fuel into the cylinder volume in a desired quantity, rate and duration in response to a fuel injection command from controller 140.
  • the direct fuel injectors 162 may be structured to inject fuel at the top of the respective cylinder a, b.
  • the direct fuel injectors 162 may be structured to inject fuel into a combustion pre-chamber associated with cylinders a, b, although in certain embodiments the dedicated EGR cylinders b do not include a combustion pre-chamber.
  • Each dedicated EGR cylinder b may include one or more direct fuel injectors 162.
  • the direct fuel injectorsl 62 may be the primary or the only fueling device for the dedicated EGR cylinders b, or alternatively the direct fuel injectors 162 may be an auxiliary or secondary fueling device for the dedicated EGR cylinders b.
  • the direct fuel injectors 162 are capable of providing all of the designed fueling amount for the dedicated EGR cylinders b at any operating condition.
  • the direct fuel inj ectors 162 may be only partially capable, for example the direct injectors 162 may be capable of providing a designated amount of fuel for a specific purpose.
  • dedicated EGR cylinders b include a port injector (not shown) in addition to or alternatively to direct fuel injectors 162.
  • the intake manifold 105 may be divided (not shown), or the port fuel injectors may be positioned such that no other cylinder in the system 100 is downstream of the port fuel injector, i.e. only the target cylinder is downstream of its respective port fuel injector.
  • the fuel supply to the combustion chamber of each cylinder a, b is controlled by a fuel control module 142 that is a separate controller or a part of controller 140.
  • Fuel control module 142 operates the direct fuel injectors 162 according to a fuel command determined or output by controller 140 in response to engine operating conditions.
  • the controller 140 is connected to the fuel pump 154 and to a plurality of other engine condition sensors shown schematically as sensors 170.
  • the engine condition sensors 170 may include, but are not limited to, sensors which monitor engine position, engine speed, manifold static pressure, mass air flow into the manifold, engine temperature, air temperature, cam shaft position (inlet and exhaust), inlet manifold tuning valves, barometric pressure, EGR amount, VGT position, torque demand, gear position, etc.
  • the system 100 includes controller 140 structured to perform certain operations to control a primary EGR engine.
  • the controller 140 forms a portion of a processing subsystem including one or more computing devices having memory, processing, and communication hardware.
  • the controller 140 may be a single device or a distributed device, and the functions of the controller 140 may be performed by hardware or via instructions stored on a computer readable storage medium.
  • the controller 140 may be included within, partially included within, or completely separated from an engine controller (not shown) such as an engine control module.
  • the controller 140 is in communication with any sensor or actuator throughout the system 100, including through direct communication, communication over a datalink, and/or through communication with other controllers or portions of the processing subsystem that provide sensor and/or actuator information to the controller 140.
  • the controller 140 is described as functionally executing certain operations.
  • the descriptions herein including the controller operations emphasizes the structural independence of the controller, and illustrates one grouping of operations and responsibilities of the controller. Other groupings that execute similar overall operations are understood within the scope of the present application.
  • Aspects of the controller may be implemented in hardware and/or by a computer executing instructions stored in non- transient memory on one or more computer readable media, and the controller may be distributed across various hardware or computer based components.
  • Example and non-limiting controller implementation elements include sensors providing any value determined herein, sensors providing any value that is a precursor to a value determined herein, datalink and/or network hardware including communication chips, oscillating crystals, communication links, cables, twisted pair wiring, coaxial wiring, shielded wiring, transmitters, receivers, and/or transceivers, logic circuits, hard-wired logic circuits, reconfigurable logic circuits in a particular non-transient state configured according to the module specification, any actuator including at least an electrical, hydraulic, or pneumatic actuator, a solenoid, an op-amp, analog control elements (springs, filters, integrators, adders, dividers, gain elements), and/or digital control elements.
  • datalink and/or network hardware including communication chips, oscillating crystals, communication links, cables, twisted pair wiring, coaxial wiring, shielded wiring, transmitters, receivers, and/or transceivers, logic circuits, hard-wired logic circuits, reconfigurable logic circuits in a particular non-transient
  • controllers, control systems and control methods disclosed herein are structured to perform operations that improve various technologies and provide improvements in various technological fields.
  • example and non-limiting technology improvements include improvements in combustion performance of internal combustion engines, improvements in emissions performance, aftertreatment system regeneration, engine torque generation and torque control, engine fuel economy performance, improved durability of exhaust system components for internal combustion engines, and engine noise and vibration control.
  • example and non-limiting technological fields that are improved include the technological fields of internal combustion engines and related apparatuses and systems as well as vehicles including the same.
  • Certain operations described herein include operations to interpret or determine one or more parameters.
  • Interpreting or determining includes receiving values by any method known in the art, including at least receiving values from a datalink or network communication, receiving an electronic signal (e.g. a voltage, frequency, current, or PWM signal) indicative of the value, receiving a software parameter indicative of the value, reading the value from a memory location on a non-transient computer readable storage medium, receiving the value as a run-time parameter by any means known in the art, and/or by receiving a value by which the interpreted or determined parameter can be calculated, and/or by referencing a default value that is interpreted or determined to be the parameter value.
  • an electronic signal e.g. a voltage, frequency, current, or PWM signal
  • the controller 140 interprets an EGR cylinder deactivation condition, and in response to the EGR cylinder deactivation condition the controller 140 provides an EGR cylinder deactivation command that cuts fuelling to one or more of dedicated EGR cylinders b.
  • the EGR cylinder deactivation condition includes any condition understood in the art.
  • an EGR cylinder deactivation produces favorable operating conditions, such as at low load or torque request conditions for engine 102 where the remaining cylinders can satisfy the load or torque request requirements, and fuel efficiency can be achieved by cutting fuelling to one or more of the dedicated EGR cylinders b.
  • an EGR cylinder deactivation condition produces favorable operating conditions to increase a temperature of the exhaust flow 134 that is received in exhaust passage 132 in order to, for example, warm-up engine 102, warm-up or provide thermal management of one or more aftertreatment components of aftertreatment system 138, and/or for improving a transient response, such as spooling up a turbine.
  • the direct fuel injectors 162 may inject the fuel supply directly into each respective cylinder a, b or may supply fuel to the inlet valve ports, the injection timing being controlled the controller 140.
  • the engine 102 has cylinder deactivation operable for one or more of the dedicated EGR cylinders b. During cylinder deactivation the supply of fuel to the one or more of the dedicated EGR cylinders b is terminated or cut off by individually disabling the respective fuel injector 162 with the disablement being controlled by the controller 140 with a fuelling command which disables the fuel injection to one or more of the dedicated EGR cylinders b while the other cylinders fire normally.
  • Controller 140 is connected to the fuel injectors 162, either indirectly as shown through fuel control module 142, or directly, to control the injector operation.
  • the controller 140 can determine the injection timing and the injection period or pulse width. Under normal engine operating conditions, fuel is provided to all cylinders a, b and exhaust gases from dedicated EGR cylinders b are recirculated to intake passage 104 and exhaust gases from non-dedicated EGR cylinders a are provided to the after-treatment device 138 by exhaust passage 132.
  • the controller 140 controls operation of the direct injectors 162 (or port injectors) in response to the EGR cylinder deactivation conditions being present to output a fuel command that cuts or terminates fuelling to one or more of dedicated EGR cylinders b.
  • the dedicated EGR cylinders b that are deactivated by terminating fuelling thereto receive and return the charge flow to intake passage 104 through EGR passage 109. This maintains the exhaust flow over the aftertreatment device 138 at a high temperature and at a
  • Procedure 200 for deactivating one or more of the dedicated EGR cylinders b.
  • Procedure 200 beings at operation 202 in which engine 102 is operated by a fuel command that provides fuelling to all of the cylinders a, b.
  • Conditional 204 determines if conditions for deactivation of one or more the dedicated EGR cylinders b are present. If conditional 204 is negative, procedure 200 returns to operation 202.
  • procedure 200 continues at operation 206 to cut or terminate fuelling to all or a portion of dedicated EGR cylinders b, providing a cylinder deactivation in which the charge flow is circulated through the deactivated dedicated EGR cylinder(s) b and returned to the intake.
  • Procedure 200 continues after operation 206 at conditional 208, where it is determined if EGR cylinder activation conditions are present. If conditional 208 is negative, procedure 200 continues to operate with fuelling to one or more of dedicated EGR cylinders b terminated. If conditional 208 is positive, fuelling is restored to the dedicated EGR cylinder(s) b at operation 210.
  • the cut of fuelling for EGR cylinder deactivation is provided in a stepwise manner so that the fuelling of the dedicated EGR cylinders b is cut or terminated sequentially in response to operating conditions. For example, when deactivation conditions are present that allow fuelling to be cut to one dedicated EGR cylinder b, fuel flow is cut to a first dedicated EGR cylinder b while fuelling of the remaining dedicated EGR cylinders b continues. When operating conditions are present that allow fuel flow to be cut to a second EGR cylinder, fuelling is then cut or terminated to a second dedicated EGR cylinder b in addition to the first dedicated EGR cylinder b.
  • the sequential termination of fuelling to the dedicated EGR cylinders b is determined at least in part in response to a torque request to engine 102. For example, when the torque request is below a first threshold, fuelling to all dedicated EGR cylinders b is terminated. When the torque request is above the first threshold and below a second threshold, fuelling of at least one dedicated EGR cylinder is terminated while the remaining dedicated EGR cylinders b are fuelled. Additional dedicated EGR deactivation thresholds could be provided depending on the number of dedicated EGR cylinders b that are provided.
  • the sequential termination of fuelling to the dedicated EGR cylinders b is determined at least in part in response to a temperature of the exhaust flow 134, a temperature of an aftertreatment component, a speed of a turbine, or other aftertreatment and/or exhaust system temperature being less than a threshold temperature determined in response to operating conditions.
  • the restoration of fuelling to multiple deactivated dedicated EGR cylinders could similarly be accomplished in a step-wise manner in response to operating conditions. For example, while multiple dedicated EGR cylinders are deactivated, fuelling is restored to a first dedicated EGR cylinder b in response to engine operating conditions while the remaining dedicated EGR cylinders b are deactivated. When operating conditions require additional power output, fuelling is restored the next dedicated EGR cylinder b.
  • a system includes an internal combustion engine having at least one dedicated EGR cylinder connected to an EGR passage and a plurality of non-dedicated EGR cylinders connected to an exhaust passage.
  • the EGR passage is connected to an intake to provide an EGR flow from the at least one dedicated EGR cylinder to the intake wherein the EGR flow is combined with an intake flow to provide a charge flow to each of the dedicated and non-dedicated EGR cylinders.
  • the system also includes a fuel system operable to provide fuel to the at least one dedicated EGR cylinder and each of the plurality of non-dedicated EGR cylinders.
  • the system further includes a controller structured to interpret an EGR cylinder deactivation condition, and in response to the EGR cylinder deactivation condition, to terminate fuelling to the at least one dedicated EGR cylinder while fuelling the plurality of non-dedicated EGR cylinders and circulating the charge flow through the at least one dedicated EGR cylinder to the intake.
  • a controller structured to interpret an EGR cylinder deactivation condition, and in response to the EGR cylinder deactivation condition, to terminate fuelling to the at least one dedicated EGR cylinder while fuelling the plurality of non-dedicated EGR cylinders and circulating the charge flow through the at least one dedicated EGR cylinder to the intake.
  • the intake includes an intake passage and an intake manifold connected to each of the dedicated and non-dedicated EGR cylinders.
  • the system includes an intake throttle in the intake passage and the EGR passage is connected to the intake passage downstream of the intake throttle.
  • the at least one dedicated EGR cylinder includes at least two dedicated EGR cylinders.
  • the controller is configured to terminate fuelling to a portion of the dedicated EGR cylinders in response to the EGR cylinder deactivation condition.
  • the controller in response to a first torque request between a first threshold and a second threshold, the controller is configured to terminate fuelling to a portion of the dedicated EGR cylinders, and in response to a torque request that is below the first threshold, the controller is configured to terminate fuelling to each of the dedicated EGR cylinders.
  • the controller is configured to provide fuel to the at least one dedicated EGR cylinder in response to the deactivation condition no longer being present.
  • the fuel system includes a fuel storage tank and each of the at least one dedicated EGR cylinder and the plurality of non-dedicated cylinders includes a direct injector to inject fuel received from the fuel storage tank into the respective cylinder.
  • the at least one dedicated EGR cylinder is flow isolated from the exhaust passage.
  • a method includes operating an internal combustion engine having at least one dedicated EGR cylinder connected to an EGR passage and a plurality of non-dedicated EGR cylinders connected to an exhaust passage; providing an EGR flow from the at least one dedicated EGR cylinder to an intake while fuelling the at least one dedicated EGR cylinder and the plurality of non-dedicated EGR cylinders;
  • EGR flow with an intake flow to provide a charge flow to each of the dedicated and non-dedicated EGR cylinders from the intake; determining an EGR cylinder deactivation condition; and in response to the EGR cylinder deactivation condition, terminating fuelling of the at least one dedicated EGR cylinder while fuelling the plurality of non-dedicated EGR cylinders and circulating the charge flow through the at least one dedicated EGR cylinder to the intake.
  • the EGR flow is provided to the intake downstream of an intake throttle.
  • the at least one dedicated EGR cylinder includes two or more dedicated EGR cylinders.
  • terminating fuelling includes terminating fuelling to a portion of the dedicated EGR cylinders in response to the EGR cylinder deactivation condition while fuelling a remaining portion of the dedicated EGR cylinders.
  • terminating fuelling includes terminating fuelling to all of the dedicated EGR cylinders in response to the EGR cylinder deactivation condition corresponding to a torque request to the internal combustion engine that is below a first threshold, and terminating fuelling to a first portion of the dedicated EGR cylinders in response to the torque request to the internal combustion engine being between the first threshold and a second threshold while fuelling a remaining portion of the dedicated EGR cylinders, where the second threshold is greater than the first threshold.
  • the method includes fuelling the at least one dedicated EGR cylinder in response to the deactivation condition no longer being present.
  • determining the EGR cylinder deactivation condition includes determining a torque request to the internal combustion engine is less than an EGR cylinder deactivation threshold. In yet another embodiment, determining the EGR cylinder deactivation condition includes determining a temperature associated with an exhaust system of the internal combustion engine is less than an EGR cylinder deactivation threshold.
  • a method includes producing an exhaust flow by combustion of a fuel in a charge flow to a plurality of cylinders of an internal combustion engine; recirculating a first portion of the exhaust flow produced by at least one dedicated EGR cylinder to an intake of the internal combustion engine; passing a second portion of the exhaust flow produced by remaining ones of the plurality of cylinders through an exhaust passage including an aftertreatment system; terminating fuelling of the at least one dedicated EGR cylinder while fuelling the remaining ones of the plurality of cylinders, and, while the fuelling is terminated to the at least one dedicated EGR cylinder and the remaining ones of the plurality of cylinders are fuelled, circulating the charge flow from the at least one dedicated EGR cylinder to the plurality of cylinders.
  • the method includes terminating fuelling in response to a torque request to the engine that is less than a first threshold. In another embodiment, terminating the fuelling occurs in response to a temperature of associated with the exhaust flow is less than a first threshold. In another embodiment, the at least one dedicated EGR cylinder includes at least two dedicated EGR cylinders. In a refinement of this
  • terminating fuelling includes terminating fuelling to a portion of the dedicated EGR cylinders while fuelling a remaining portion of the dedicated EGR cylinders.
  • terminating fuelling includes terminating fuelling to all of the dedicated EGR cylinders in response to a torque request to the internal combustion engine that is below a first threshold, and terminating fuelling to a first portion of the dedicated EGR cylinders in response to the torque request to the internal combustion engine being between the first threshold and a second threshold while fuelling the remaining portion of the dedicated EGR cylinders, wherein the second threshold is greater than the first threshold.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

La présente invention concerne des systèmes, un appareil et des procédés qui comprennent un moteur à combustion interne à échappement divisé possédant une pluralité de cylindres comprenant au moins un cylindre EGR dédié, un système d'échappement doté d'un dispositif de post-traitement d'émissions d'échappement pour les gaz d'échappement provenant des autres cylindres de la pluralité de cylindres, un système d'alimentation en air destiné à acheminer de l'air frais jusqu'aux cylindres et un système d'alimentation en combustible destiné à acheminer du combustible jusqu'à chaque cylindre. Un dispositif de commande est conçu pour interrompre l'alimentation en combustible et pour désactiver le ou les cylindres EGR dédiés en réaction aux conditions de désactivation de cylindre EGR présentes.
PCT/US2014/063806 2013-11-04 2014-11-04 Systèmes et procédés de commande de combustible d'un ou de plusieurs cylindres egr WO2015066674A1 (fr)

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CN110691899A (zh) * 2017-06-02 2020-01-14 卡明斯公司 专用egr发动机的火花塞配置
US20200256261A1 (en) * 2019-02-11 2020-08-13 Cummins Inc. Systems and methods for cylinder deactivation in dedicated egr engine
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