CN112211759A - Gas engine detonation suppression device and suppression method thereof - Google Patents

Gas engine detonation suppression device and suppression method thereof Download PDF

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Publication number
CN112211759A
CN112211759A CN202011095640.7A CN202011095640A CN112211759A CN 112211759 A CN112211759 A CN 112211759A CN 202011095640 A CN202011095640 A CN 202011095640A CN 112211759 A CN112211759 A CN 112211759A
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China
Prior art keywords
working fluid
gas
control valve
gas engine
turbine
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Pending
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CN202011095640.7A
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Chinese (zh)
Inventor
赵建辉
刘伟龙
陈修旻
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Harbin Engineering University
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Harbin Engineering University
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Priority to CN202011095640.7A priority Critical patent/CN112211759A/en
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    • 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
    • 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
    • F02D41/0002—Controlling intake air
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • 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]
    • F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
    • 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
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
    • 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
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/07—Mixed pressure loops, i.e. wherein recirculated exhaust gas is either taken out upstream of the turbine and reintroduced upstream of the compressor, or is taken out downstream of the turbine and reintroduced downstream of the compressor
    • 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
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/16—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system with EGR valves located at or near the connection to the exhaust system
    • 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
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/19—Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system
    • 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
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/21—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system with EGR valves located at or near the connection to the intake system
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10255—Arrangements of valves; Multi-way valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
    • F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids

Abstract

The invention aims to provide a gas engine knock suppression device and a suppression method thereof, and the device comprises a gas engine and a turbocharger, wherein an exhaust pipe of the gas engine is respectively connected with an EGR passage and a turbine of the turbocharger, the EGR passage is connected with a first inlet of a mixer, an outlet of the mixer is connected with an air inlet pipe of the gas engine, an outlet of the turbine is respectively connected with an atmosphere and an injection fluid inlet pipe, the injection fluid inlet pipe is connected with an ejector through an injection fluid control valve, an air compressor outlet of the turbocharger is respectively connected with a working fluid inlet pipe and a mixed fluid exhaust pipe, the working fluid inlet pipe is connected with the ejector through the working fluid control valve, an outlet of the ejector is connected with a mixed fluid exhaust pipe, and the mixed fluid exhaust pipe is connected with a second inlet of the. On the premise of not influencing the power output of the gas engine, the low-pressure waste gas at the rear end of the turbine can be injected into the air inlet pipe of the gas engine, so that the gas engine obtains higher EGR rate, and the knocking suppression of the gas engine under a large-load working condition is realized.

Description

Gas engine detonation suppression device and suppression method thereof
Technical Field
The invention relates to an engine, in particular to a gas engine.
Background
With the increase of environmental pollution and the exhaustion of fossil resources, the gas engine can achieve the best economy and emission performance by burning hydrogen or natural gas, and thus is widely used. In order to improve the power and efficiency of natural gas engines, natural gas engines are usually matched with turbocharging systems, but this can lead to the occurrence of gas engine knocking, which can lead to drastic deterioration of gas engine performance and reduced engine life and reliability, so that a greater degree of knocking is strictly not allowed on gas engines. German MAN company detects and controls knocking by means of a cylinder pressure sensor installed on the gas engine along with the main engine.
The knock suppression can be realized by adding hydrogen with a faster combustion speed into natural gas, but the method needs to add a set of hydrogen supply system on the host machine, which not only increases the manufacturing cost of the host machine, but also has the problem of hydrogen safety. Currently, the more common technical means for gas engines is Exhaust Gas Recirculation (EGR), which reduces the knocking of the gas engine to some extent by redirecting a portion of the exhaust gas back into the cylinder, but this technique has certain limitations, especially for heavy load conditions. This is because, in order to achieve a large power demand, the gas engine needs to apply more exhaust gas to the turbocharger system to compress more fresh air, but at this time, the high-temperature and high-pressure gas in the cylinder increases, the tendency of occurrence of knocking increases, the exhaust gas needs to be recirculated by the EGR system to reduce the thermal state in the cylinder, but the exhaust gas cannot be bypassed to the EGR system because of driving the turbine, which makes it impossible to achieve a technical means of achieving knock suppression by EGR under a heavy load condition.
Disclosure of Invention
The invention aims to provide a gas engine knock suppression device and a suppression method thereof, which are used for solving the problem that the prior art cannot effectively suppress engine knock under a large-load working condition.
The purpose of the invention is realized as follows:
the invention relates to a gas engine knock suppression device, which is characterized in that: the exhaust pipe of the gas machine is respectively connected with the turbine of an EGR passage and the turbine of the turbocharger, the EGR passage is connected with a first inlet of a mixer, an outlet of the mixer is connected with an air inlet pipe of the gas machine, an outlet of the turbine is respectively connected with the atmosphere and an injection fluid air inlet pipe, the injection fluid air inlet pipe is connected with an ejector through an injection fluid control valve, a gas compressor outlet of the turbocharger is respectively connected with a working fluid air inlet pipe and a mixed fluid exhaust pipe, the working fluid air inlet pipe is connected with the ejector through the working fluid control valve, an outlet of the ejector is connected with a mixed fluid exhaust pipe, and the mixed fluid exhaust pipe is connected with a second inlet of the mixer.
The knock suppressing apparatus for a gas engine according to the present invention may further include:
1. the ejector comprises an inlet shell, a mixing chamber and a diffusion chamber which are sequentially connected, a working fluid channel is arranged in the inlet shell, a working fluid inlet and a nozzle are respectively arranged at two ends of the working fluid channel, the working fluid inlet is connected with a working fluid control valve, an ejection fluid inlet is arranged on the inlet shell and is connected with the ejection fluid control valve, a mixed fluid outlet is arranged at the end part of the diffusion chamber, and the mixed fluid outlet is connected with a mixed fluid exhaust pipe.
2. The diameter of the working fluid channel decreases toward the nozzle from the working fluid inlet.
The invention discloses a method for suppressing gas engine detonation, which is characterized by comprising the following steps:
under the working condition of small load, the injection fluid control valve and the working fluid control valve are kept closed, part of the waste gas discharged from the cylinder of the gas engine flows through the EGR control valve and the cooler, enters the mixer, is mixed with air and then enters the cylinder again to participate in the combustion process, and the other part of the waste gas flows through the turbine of the turbocharger, works on the turbine and then is discharged from an exhaust pipe at the rear end of the turbine;
under the working condition of large load, the injection fluid control valve and the working fluid control valve are both in an open state, part of pressurized air at the rear end of the air compressor enters the injector from the working fluid inlet, the pressurized air flows out of the nozzle at high speed and then enters the mixing chamber, the diameter of a pipeline is reduced when the pressurized air flows through the nozzle, the cross-sectional area of gas circulation is reduced, the flow rate of the gas is increased, a low-pressure area is formed at the outlet of the nozzle, a pressure difference is formed between the low-pressure area and low-pressure waste gas at the rear end of the turbine, the low-pressure waste gas is sucked into the injector through the injection fluid inlet of the injector, the low-pressure waste gas and the pressurized air flow through the diffusion chamber after mixing and energy exchange are completed in the mixing chamber, the low-pressure waste gas.
The invention has the advantages that: on the premise of not influencing the power output of the gas engine, the gas engine knock suppression device can inject low-pressure waste gas at the rear end of the turbine into the air inlet pipe of the gas engine, so that the gas engine obtains higher EGR rate, and the knock suppression of the gas engine under a large-load working condition is realized.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of the ejector of the present invention.
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
referring to fig. 1-2, the engine knock suppression device of the present invention includes an injection fluid control valve 7, a working fluid control valve 8, an injector 9, an injection fluid intake pipe 101, a working fluid intake pipe 102, and a mixed fluid exhaust pipe 103.
As shown in fig. 2, the ejector 9 includes a working fluid inlet 10, a nozzle 11, a mixing chamber 12, an ejector fluid inlet 13, a diffusion chamber 14, and a mixed fluid outlet 15.
An injection fluid inlet 13, a working fluid inlet 10 and a mixed fluid outlet 15 of the ejector 9 are respectively connected with the injection fluid module, the working fluid module and the mixed fluid module.
The injection fluid module comprises an injection fluid air inlet pipe 101 and an injection fluid control valve 7, one end of the injection fluid air inlet pipe 101 is connected with an exhaust pipe at the rear end of the turbine, the other end of the injection fluid air inlet pipe 101 is connected with an injection fluid inlet of the injector 9, and the injection fluid control valve 7 is installed on the injection fluid air inlet pipe 101 and is installed in front of the injection fluid inlet of the injector 9.
The working fluid module comprises a working fluid inlet pipe 102 and a working fluid control valve 8, one end of the working fluid inlet pipe 102 is connected with an air inlet pipe at the rear end of the air compressor, the other end of the working fluid inlet pipe 102 is connected with a working fluid inlet of the ejector 9, and the working fluid control valve 8 is installed on the working fluid inlet pipe 102 and is installed in front of the working fluid inlet of the ejector 9.
The mixed fluid module comprises a mixed fluid exhaust pipe 103, and two ends of the mixed fluid exhaust pipe 103 are respectively connected with a mixed fluid outlet of the ejector 9 and an air inlet pipe in front of the intercooler 6.
Under the working condition of small load, the injection fluid control valve 7 and the working fluid control valve 8 are kept closed, and the injection fluid module and the working fluid module are not communicated with the injector 9. A part of the exhaust gas discharged from the cylinder of the gas engine 1 flows through the EGR control valve 3 and the cooler 4, enters the mixer 5, is mixed with air and then enters the cylinder again to participate in the combustion process, and the other part of the exhaust gas flows through the turbine of the turbocharger 2, works on the turbine and then is discharged from an exhaust pipe at the rear end of the turbine.
Under the working condition of large load, the injection fluid control valve 7 and the working fluid control valve 8 are both in an open state, and the injection fluid module and the working fluid module are communicated with the injector 9. Part of pressurized air at the rear end of the air compressor enters the ejector 9 from the working fluid inlet 10 at a certain pressure, the pressurized air flows out from the nozzle 11 at a high speed and enters the mixing chamber 12, the diameter of a pipeline is reduced when the pressurized air flows through the nozzle 11, the cross-sectional area for gas circulation is reduced, the flow rate of the gas is increased, a low-pressure area appears at the outlet of the nozzle 11, a huge pressure difference is formed between the low-pressure area and low-pressure waste gas at the rear end of the turbine, the low-pressure waste gas is sucked into the ejector 9 through the injection fluid inlet 13 of the ejector 9, the low-pressure waste gas and the pressurized air flow through the diffusion chamber 14 after uniform mixing and energy exchange are completed in the mixing chamber 12, the low-pressure waste gas and the pressurized air are discharged out of the ejector 9 from the.

Claims (4)

1. A gas engine knock suppression device is characterized in that: the exhaust pipe of the gas machine is respectively connected with the turbine of an EGR passage and the turbine of the turbocharger, the EGR passage is connected with a first inlet of a mixer, an outlet of the mixer is connected with an air inlet pipe of the gas machine, an outlet of the turbine is respectively connected with the atmosphere and an injection fluid air inlet pipe, the injection fluid air inlet pipe is connected with an ejector through an injection fluid control valve, a gas compressor outlet of the turbocharger is respectively connected with a working fluid air inlet pipe and a mixed fluid exhaust pipe, the working fluid air inlet pipe is connected with the ejector through the working fluid control valve, an outlet of the ejector is connected with a mixed fluid exhaust pipe, and the mixed fluid exhaust pipe is connected with a second inlet of the mixer.
2. The gas engine knock suppression device of claim 1, further comprising: the ejector comprises an inlet shell, a mixing chamber and a diffusion chamber which are sequentially connected, a working fluid channel is arranged in the inlet shell, a working fluid inlet and a nozzle are respectively arranged at two ends of the working fluid channel, the working fluid inlet is connected with a working fluid control valve, an ejection fluid inlet is arranged on the inlet shell and is connected with the ejection fluid control valve, a mixed fluid outlet is arranged at the end part of the diffusion chamber, and the mixed fluid outlet is connected with a mixed fluid exhaust pipe.
3. The gas engine knock suppression device of claim 2, further comprising: the diameter of the working fluid channel decreases toward the nozzle from the working fluid inlet.
4. A gas engine knock suppression method is characterized by comprising the following steps:
under the working condition of small load, the injection fluid control valve and the working fluid control valve are kept closed, part of the waste gas discharged from the cylinder of the gas engine flows through the EGR control valve and the cooler, enters the mixer, is mixed with air and then enters the cylinder again to participate in the combustion process, and the other part of the waste gas flows through the turbine of the turbocharger, works on the turbine and then is discharged from an exhaust pipe at the rear end of the turbine;
under the working condition of large load, the injection fluid control valve and the working fluid control valve are both in an open state, part of pressurized air at the rear end of the air compressor enters the injector from the working fluid inlet, the pressurized air flows out of the nozzle at high speed and then enters the mixing chamber, the diameter of a pipeline is reduced when the pressurized air flows through the nozzle, the cross-sectional area of gas circulation is reduced, the flow rate of the gas is increased, a low-pressure area is formed at the outlet of the nozzle, a pressure difference is formed between the low-pressure area and low-pressure waste gas at the rear end of the turbine, the low-pressure waste gas is sucked into the injector through the injection fluid inlet of the injector, the low-pressure waste gas and the pressurized air flow through the diffusion chamber after mixing and energy exchange are completed in the mixing chamber, the low-pressure waste gas.
CN202011095640.7A 2020-10-14 2020-10-14 Gas engine detonation suppression device and suppression method thereof Pending CN112211759A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112933866A (en) * 2021-03-22 2021-06-11 哈尔滨工程大学 Gas-liquid two-phase ejector capable of being used for purifying harmful gas
CN114183278A (en) * 2021-12-07 2022-03-15 潍柴动力股份有限公司 EGR ejector pipeline system and EGR control method

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JPH10131742A (en) * 1996-10-29 1998-05-19 Yanmar Diesel Engine Co Ltd Exhaust gas recirculating type gas engine
EP0969186A2 (en) * 1998-07-03 2000-01-05 Toyota Jidosha Kabushiki Kaisha A device for purifying the exhaust gas of an internal combustion engine
EP2392802A2 (en) * 2010-07-06 2011-12-07 BorgWarner, Inc. Controlling Exhaust Gas Recirculation in a Turbocharged Engine System
WO2012102467A1 (en) * 2011-01-24 2012-08-02 두산인프라코어 주식회사 Method for controlling an exhaust gas recirculation apparatus for heavy construction equipment
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