CN113279883A - high-EGR-rate exhaust gas recirculation system and control method - Google Patents

high-EGR-rate exhaust gas recirculation system and control method Download PDF

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Publication number
CN113279883A
CN113279883A CN202110738960.8A CN202110738960A CN113279883A CN 113279883 A CN113279883 A CN 113279883A CN 202110738960 A CN202110738960 A CN 202110738960A CN 113279883 A CN113279883 A CN 113279883A
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China
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egr
exhaust gas
exhaust
heat exchanger
assembly
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CN202110738960.8A
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Chinese (zh)
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CN113279883B (en
Inventor
韩令海
张宇璠
王占峰
李春雨
马赫阳
黄平慧
李华
宫艳峰
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FAW Group Corp
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FAW Group Corp
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Priority to CN202110738960.8A priority Critical patent/CN113279883B/en
Publication of CN113279883A publication Critical patent/CN113279883A/en
Priority to PCT/CN2022/089177 priority patent/WO2023273567A1/en
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Publication of CN113279883B publication Critical patent/CN113279883B/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
    • F02M26/14—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F01M5/02—Conditioning lubricant for aiding engine starting, e.g. heating
    • F01M5/021—Conditioning lubricant for aiding engine starting, e.g. heating by heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
    • F01N5/025—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat the device being thermoelectric generators
    • 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
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • 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
    • F02M26/34—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with compressors, turbines or the like in the recirculation passage
    • 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
    • F02M26/37—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with temporary storage of recirculated exhaust gas
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/32—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from a charging set comprising a non-electric prime mover rotating at constant speed
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N11/00—Generators or motors not provided for elsewhere; Alleged perpetua mobilia obtained by electric or magnetic means
    • H02N11/002—Generators
    • 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
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Power Engineering (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

The invention belongs to the technical field of energy conservation and emission reduction of automobile engines, and particularly relates to a high EGR (exhaust gas recirculation) rate exhaust gas recirculation system and a control method. The exhaust means comprises a plurality of cylinders; the oil heating device includes an oil heat exchanger communicating with the drain assembly, and heating the oil using the exhaust gas; the recycling device comprises a recycling component and an electric storage component; the circulation assembly comprises an EGR storage tank and a plurality of air inlet pipelines; the power storage assembly comprises a power generation mechanism, a storage battery and an EGR pump, wherein the power generation mechanism charges the storage battery by using the energy of exhaust gas, and the storage battery and the power generation mechanism are electrically connected with the EGR pump to pressurize the exhaust gas in the EGR storage tank. According to the exhaust gas recirculation system with the high EGR rate and the control method, the engine cold start warm-up time is shortened, and the fuel economy of the whole vehicle is improved; the waste gas energy is used for charging the storage battery and driving the EGR pump, so that a larger EGR rate is realized, and the potential of saving oil is fully developed.

Description

high-EGR-rate exhaust gas recirculation system and control method
Technical Field
The invention relates to the technical field of energy conservation and emission reduction of automobile engines, in particular to a high EGR (exhaust gas recirculation) rate exhaust gas recirculation system and a control method.
Background
With the strictness of emission regulations and oil consumption regulations, the primary goal of automobile development is energy conservation and emission reduction. The EGR (exhaust gas recirculation) technology can reduce the knocking tendency and the exhaust gas loss and improve the fuel economy, and is an important development direction of an automobile fuel-saving technical route. In the cold starting stage of the automobile, because the water temperature of the engine is far lower than the temperature (90 ℃) during normal operation, the oil consumption and the emission of the engine are deteriorated in the process of slowly raising the temperature, so that the engine warming time is shortened, the rapid warming is realized, the fuel consumption rate of the engine can be obviously reduced, and the emission of harmful pollutants is improved. In addition, in the normal operation stage of the engine, the EGR rate of the exhaust gas recirculation system is limited due to overhigh exhaust gas temperature, the maximum EGR rate is usually not more than 25%, the energy of the exhaust gas cannot be fully utilized, and the oil saving potential needs to be further improved.
Disclosure of Invention
The invention aims to provide the exhaust gas recirculation system with the high EGR rate and the control method, the exhaust gas recirculation system with the high EGR rate breaks through the limitation of the maximum EGR rate of the conventional exhaust gas recirculation system, can realize the larger EGR rate, and fully excavates the oil saving potential of the exhaust gas recirculation system; meanwhile, the energy of exhaust gas is fully utilized, the cold start warming-up time of the engine is shortened, and the actual operation fuel economy of the whole vehicle is improved; the control method controls the exhaust gas recirculation system with high EGR rate according to the running condition of the engine in the actual running process of the vehicle, controls the flow direction of the exhaust gas, adjusts the flow rate of the exhaust gas and realizes the intelligent controllable circulation of the exhaust gas.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, a high EGR rate exhaust gas recirculation system is provided, comprising:
an exhaust device including a plurality of cylinders and an exhaust assembly in communication with exhaust ports of the cylinders, the exhaust assembly configured to exhaust gases produced by the cylinders;
an oil heating device including an oil heat exchanger in communication with the drain assembly, the oil heat exchanger configured to heat oil using the exhaust gas; and
a recirculation device, the recirculation device comprising:
the circulating assembly comprises an EGR storage tank and a plurality of air inlet pipelines, an air inlet of the EGR storage tank is communicated with the discharge assembly, an air outlet of the EGR storage tank is communicated with one ends of the air inlet pipelines respectively, and the other ends of the air inlet pipelines are communicated with air inlets of the cylinders respectively;
an electrical storage assembly including a power generation mechanism, a battery, and an EGR pump, the power generation mechanism in communication with the exhaust assembly, the power generation mechanism configured to charge the battery using energy of the exhaust gas, the battery and the power generation mechanism electrically connected to the EGR pump, the EGR pump in communication with the EGR storage tank, the EGR pump configured to pressurize the exhaust gas in the EGR storage tank.
As a preferable structure of the present invention, the power generation mechanism includes:
an EGR heat exchanger in communication with the exhaust assembly;
a thermoelectric generator in communication with the EGR heat exchanger and electrically connected to the battery, the thermoelectric generator configured to convert energy of the exhaust gas to electrical energy.
As a preferable configuration of the present invention, the power storage module further includes a parallel switch and a series switch, both ends of the parallel switch are electrically connected to the battery and the EGR pump, respectively, and both ends of the series switch are electrically connected to the thermoelectric generator and the EGR pump, respectively.
As a preferable structure of the present invention, the engine oil heating device further includes an engine oil heating exhaust line valve, and both ends of the engine oil heating exhaust line valve are respectively communicated with the drain assembly and the engine oil heat exchanger.
As a preferable structure of the invention, the recycling device further includes an energy conversion tank, one end of the energy conversion tank is communicated with the discharging component, and the other end of the energy conversion tank is connected in parallel with the circulating component and the power storage component.
As a preferable structure of the present invention, the recirculation apparatus further includes an EGR exhaust line valve, and both ends of the EGR exhaust line valve communicate with the exhaust assembly and the energy conversion tank, respectively.
As a preferable structure of the present invention, the recirculation device further includes an EGR valve, and both ends of the EGR valve communicate with the energy conversion tank and the EGR storage tank, respectively.
As a preferable structure of the present invention, the circulation module further includes a plurality of cylinder intake pipe valves, one ends of the plurality of cylinder intake pipe valves are each communicated with the EGR storage tank, and the other ends are respectively communicated with the plurality of cylinders.
In another aspect, a control method for controlling the above-described high EGR rate exhaust gas recirculation system is provided, including the steps of:
step S1, starting the cold start of the automobile, starting the engine, opening the engine oil heating exhaust pipeline valve, closing the EGR exhaust pipeline valve, operating the engine oil heat exchanger, and completely heating the engine oil by the exhaust gas discharged by the discharge assembly;
step S2, detecting the oil temperature of the engine oil, and when the actual oil temperature of the engine oil is higher than the lower limit of the engine oil temperature, opening the EGR exhaust pipeline valve and enabling the engine oil heat exchanger to work continuously;
step S3, when the actual oil temperature of the engine oil is higher than the upper limit of the engine oil temperature, the engine oil heating exhaust pipeline valve is closed, and the engine oil heat exchanger stops working; the EGR heat exchanger works, the EGR valve is closed, and the thermoelectric generator charges the storage battery by using the energy of all the waste gas;
step S4, when the electric quantity of the storage battery is larger than or equal to the lower charging limit of the storage battery, the EGR heat exchanger continuously works, the thermoelectric generator continuously charges the storage battery, the EGR valve is opened, and part of waste gas enters an EGR storage tank for circularly entering a plurality of cylinders;
step S5, when the electric quantity of the storage battery is larger than or equal to the upper charging limit of the storage battery, the EGR heat exchanger stops working, and all the waste gas enters the EGR storage tank and is used for circularly entering the plurality of cylinders;
and step S6, when the electric quantity of the storage battery is reduced to the lower charging limit of the storage battery, repeating the step S4 to the step S5.
As a preferred embodiment of the present invention, in parallel with the step S4 and the step S5, the method further includes the steps of:
SS1, an EGR pump works, exhaust gas in the EGR storage tank is pressurized, and the flow rate of the exhaust gas entering the cylinders is adjusted through a plurality of cylinder inlet pipe valves according to the target EGR rate of the cylinders; when the required power of the EGR pump is larger than the power of the thermoelectric generator, a parallel switch and a series switch are communicated, and the storage battery and the thermoelectric generator jointly drive the EGR pump; and when the required power of the EGR pump is less than or equal to the power of the thermoelectric generator, the parallel switch is switched off, and the thermoelectric generator drives the EGR pump.
The invention has the beneficial effects that: the high EGR rate exhaust gas recirculation system provided by the invention divides a pipeline connected with the discharge device into two parts, so that the discharge assembly is connected with the engine oil heating device and the recirculation device in parallel, the exhaust gas energy is fully utilized, the warm-up time of the cold start of the engine is shortened, the rapid warm-up is realized, the fuel consumption rate of the engine can be obviously reduced, the emission of harmful pollutants is improved, and the fuel economy of the actual operation of the whole vehicle is improved; the pipeline of the recirculation device is also divided into two parts, energy recovery is carried out on part of waste gas through the power generation mechanism, the waste gas is converted into electric energy to charge the storage battery, on one hand, after the EGR waste gas is subjected to energy recovery, the temperature is reduced, and the large EGR rate can be realized and can reach 50%; on the other hand, the charged storage battery can drive the EGR pump to pressurize the exhaust gas in the EGR storage tank, so that the energy of the exhaust gas is more fully utilized, and the controllable circulation of the energy of the exhaust gas is formed. The control method controls the exhaust gas recirculation system with high EGR rate according to the running condition of the engine in the actual running process of the vehicle, controls the flow direction and application of the exhaust gas, and realizes intelligent controllable circulation of the exhaust gas.
Drawings
FIG. 1 is a schematic diagram of a high EGR rate EGR system according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method according to a second embodiment of the present invention.
In the figure:
1. a discharge device; 11. a cylinder; 111. a first cylinder; 1111. a first exhaust gas sensor; 112. a second air cylinder; 1121. a second exhaust gas sensor; 113. a third air cylinder; 1131. a third exhaust gas sensor; 114. a cylinder IV; 1141. a fourth exhaust gas sensor; 12. a discharge assembly; 13. an exhaust manifold; 14. an emissions sensor;
2. an engine oil heating device; 21. an engine oil heat exchanger; 22. the engine oil heats the exhaust pipeline valve; 23. the engine oil heats the exhaust pipeline; 24. a temperature sensor;
3. a recirculation device; 31. a circulation component; 311. an EGR storage tank; 312. an air intake line; 3121. a first air inlet pipeline; 3122. an air inlet pipeline II; 3123. an air inlet pipeline III; 3124. an air inlet pipeline IV; 313. a cylinder intake pipe valve; 3131. a first air inlet pipe valve; 3132. a second air inlet pipe valve; 3133. a third air inlet pipe valve; 3134. a fourth air inlet pipe valve; 314. a first EGR sensor; 315. a second EGR sensor; 316. an EGR sensor III; 317. an EGR sensor IV; 32. an electricity storage module; 321. a power generation mechanism; 3211. an EGR heat exchanger; 3212. a thermoelectric generator; 322. a storage battery; 323. an EGR pump; 324. a parallel switch; 325. a series switch; 33. an energy conversion tank; 34. an EGR exhaust line valve; 35. an EGR valve; 36. an EGR exhaust line; 37. an EGR gas outlet pipeline;
4. an air cleaner;
5. an air intake device; 51. a first intake manifold; 52. a second intake manifold; 53. an intake manifold III; 54. an intake manifold four;
6. tail pipe device.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example one
As shown in fig. 1, the embodiment of the present invention provides a high EGR rate exhaust gas recirculation system including an exhaust device 1, an oil heating device 2, and a recirculation device 3. The exhaust apparatus 1 includes a plurality of cylinders 11 and an exhaust assembly 12, the exhaust assembly 12 communicating with exhaust ports of the cylinders 11, the exhaust assembly 12 being configured to exhaust gas generated by the cylinders 11. In the embodiment of the present invention, the plurality of cylinders 11 are a cylinder one 111, a cylinder two 112, a cylinder three 113, and a cylinder four 114, respectively. An exhaust sensor I1111, an exhaust sensor II 1121, an exhaust sensor III 1131 and an exhaust sensor IV 1141 are respectively arranged on an air outlet pipeline of each cylinder. An exhaust gas sensor is used to monitor the exhaust gas displacement of the cylinders. In other embodiments, other numbers of cylinders and exhaust sensors may be provided according to the requirements of the entire vehicle system, which is not limited to this embodiment. The exhaust assembly 12 further includes an exhaust manifold 13 and an exhaust sensor 14, the plurality of cylinders 11 and the exhaust assembly 12 are connected to each other through both ends of the exhaust manifold 13, and the flow rate of the exhaust gas entering the exhaust assembly 12 from the exhaust manifold 13 is monitored in real time through the exhaust sensor 14.
The oil heating device 2 includes an oil heat exchanger 21, the oil heat exchanger 21 communicating with the drain assembly 12, the oil heat exchanger 21 being configured to heat oil using exhaust gas. When the automobile is started in a cold state, because the temperature of the engine water is far lower than the temperature (90 ℃) during normal operation, the oil consumption and the emission of the engine are deteriorated in the process of slowly raising the temperature, and at the moment, the engine oil of the engine is heated by using the energy of the exhaust gas emitted by the emission component 12, so that the quick warming-up is realized, and the fuel consumption and the emission are reduced. Preferably, the oil heating device 2 further comprises an oil heating exhaust pipeline 23, an oil pan and a temperature sensor 24; two ends of the engine oil heating exhaust pipeline 23 are respectively communicated with the exhaust assembly 12 and the engine oil heat exchanger 21 and used for conveying exhaust gas exhausted by the exhaust assembly 12; the oil heat exchanger 21 heats the oil in the oil pan using the energy of the exhaust gas, and measures the real-time temperature of the oil by the temperature sensor 24 for monitoring.
The recirculation device 3 includes a circulation module 31 and an electricity storage module 32. The circulation assembly 31 includes an EGR storage tank 311 and a plurality of intake pipes 312, an intake port of the EGR storage tank 311 communicates with the exhaust assembly 12, an outlet port of the EGR storage tank 311 communicates with one ends of the plurality of intake pipes 312, respectively, and the other ends of the intake pipes 312 communicate with intake ports of the plurality of cylinders 11, respectively. The electric storage assembly 32 includes an electric power generation mechanism 321, a battery 322, and an EGR pump 323, the electric power generation mechanism 321 is communicated with the exhaust assembly 12, the electric power generation mechanism 321 is configured to charge the battery 322 using the exhaust gas, the battery 322 and the electric power generation mechanism 321 are both electrically connected to the EGR pump 323, the EGR pump 323 is communicated with the EGR tank 311, and the EGR pump 323 is configured to pressurize the exhaust gas in the EGR tank 311. In the embodiment of the present invention, the recirculation device 3 further includes an EGR exhaust line 36 and an EGR gas outlet line 37, one end of the EGR exhaust line 36 is communicated with the exhaust assembly 12 for delivering the exhaust gas discharged from the exhaust assembly 12 to the circulation assembly 31 and the storage assembly 32; two ends of the EGR outlet pipeline 37 are respectively communicated with the EGR storage tank 311 and the EGR outlet pipeline 36, and the EGR outlet pipeline 37 is used for conveying exhaust gas for the EGR storage tank 311.
In the embodiment of the present invention, the high EGR rate exhaust gas recirculation system further includes an air cleaner 4, an intake device 5, and a tail pipe device 6. The air filter 4 is communicated with an air inlet device 5 and used for filtering gas which is about to enter the cylinder; the intake device 5 includes a first intake manifold 51, a second intake manifold 52, a third intake manifold 53 and a fourth intake manifold 54, and the four intake manifolds are respectively communicated with a first cylinder 111, a second cylinder 112, a third cylinder 113 and a fourth cylinder 114. The tail pipe device 6 is connected to the oil heat exchanger 21 for discharging excess exhaust gas to the outside of the system.
According to the high EGR rate exhaust gas recirculation system provided by the embodiment of the invention, a pipeline connected with the exhaust device 1 is divided into two parts, so that the exhaust component 12 is connected with the engine oil heating device 2 and the recirculation device 3 in parallel, the exhaust gas energy is fully utilized, the warm-up time of the cold start of an engine is shortened, the rapid warm-up is realized, the fuel consumption rate of the engine can be obviously reduced, the emission of harmful pollutants is improved, and the fuel economy of the actual operation of the whole vehicle is improved; the pipeline of the recirculation device 3 is also divided into two parts, energy recovery is carried out on part of exhaust gas through the power generation mechanism 321, the exhaust gas is converted into electric energy to charge the storage battery 322, on one hand, after the EGR exhaust gas is subjected to energy recovery, the temperature is reduced, and a large EGR rate can be realized and can reach 50%; on the other hand, the charged battery 322 can drive the EGR pump 323 to pressurize the exhaust gas in the EGR tank 311, and a controlled circulation of the exhaust gas energy is formed by more fully utilizing the exhaust gas energy.
Further, the power generation mechanism 321 includes an EGR heat exchanger 3211 and a thermoelectric generator 3212. The EGR heat exchanger 3211 communicates with the exhaust assembly 12; the thermoelectric generator 3212 communicates with the EGR heat exchanger 3211 and is electrically connected to the battery 322, and the thermoelectric generator 3212 is configured to convert energy of exhaust gas into electric energy. The energy of the exhaust gas is converted by the EGR heat exchanger 3211 and the thermoelectric generator 3212, and the heat energy is converted into electric energy to charge the battery 322.
The power storage module 32 further includes a parallel switch 324 and a series switch 325, both ends of the parallel switch 324 are electrically connected to the battery 322 and the EGR pump 323, respectively, and both ends of the series switch 325 are electrically connected to the thermoelectric generator 3212 and the EGR pump 323, respectively. When the required power of the EGR pump 323 is larger than the power of the thermoelectric generator 3212, the parallel switch 324 and the series switch 325 are communicated, and the storage battery 322 and the thermoelectric generator 3212 jointly drive the EGR pump 323; when the required power of the EGR pump 323 is less than or equal to the power of the thermoelectric generator 3212, the parallel switch 324 is turned off, and the thermoelectric generator 3212 drives the EGR pump 323. Through the parallel switch 324 and the series switch 325, the mode that the storage battery 322 and the thermoelectric generator 3212 drive the EGR pump 323 can be selected according to the requirement of the exhaust pressure in the system, and the energy of the exhaust is utilized more efficiently.
Further, the oil heating apparatus 2 further includes an oil heating exhaust line valve 22, and both ends of the oil heating exhaust line valve 22 communicate with the drain assembly 12 and the oil heat exchanger 21, respectively. The oil heating exhaust line valve 22 is used to control whether the oil heating exhaust line 23 is connected or not. After the temperature of the heated engine oil reaches the upper limit of the engine oil temperature, the engine oil heating exhaust pipeline valve 22 is closed, waste gas is not used for heating the engine oil, and the engine oil temperature of the engine is prevented from being too high.
Further, the recycling device 3 further comprises an energy conversion tank 33, one end of the energy conversion tank 33 is communicated with the discharging assembly 12, and the other end of the energy conversion tank 33 is connected with the circulating assembly 31 and the storage assembly 32 in parallel. The energy conversion tank 33 is configured to receive exhaust gas from the exhaust assembly 12, and preferably, the EGR heat exchanger 3211 is disposed within the energy conversion tank 33.
Further, the recirculation apparatus 3 further includes an EGR exhaust line valve 34, and both ends of the EGR exhaust line valve 34 communicate with the exhaust assembly 12 and the energy conversion tank 33, respectively. Preferably, the EGR valve 34 is disposed on the EGR valve 36 for controlling the communication of the EGR valve 36. In the cold start stage of the engine, when the actual temperature of the engine oil does not reach the lower limit of the temperature of the engine oil, the EGR exhaust pipeline valve 34 needs to be closed, and all waste gas is used for heating the engine oil through the engine oil heat exchanger 21, so that the purpose of quickly warming up the engine oil is achieved. When the actual temperature of the engine oil reaches the lower limit of the engine oil temperature, the EGR exhaust pipe valve 34 is opened.
Further, the recirculation device 3 further includes an EGR valve 35, and both ends of the EGR valve 35 communicate with the energy conversion tank 33 and the EGR storage tank 311, respectively. Preferably, the EGR valve 35 is disposed on the EGR outlet line 37 for controlling communication of the EGR outlet line 37. In the normal operation stage of the engine, when the electric quantity of the battery 322 is less than the lower charge limit of the battery 322, the EGR valve 35 needs to be closed, and the thermoelectric generator 3212 charges the battery 322 by using the energy of all the exhaust gases.
Further, the circulation assembly 31 further includes a plurality of cylinder intake pipe valves 313, and one ends of the plurality of cylinder intake pipe valves 313 are communicated with the EGR storage tank 311, and the other ends are communicated with the plurality of cylinders 11, respectively. In the present embodiment, circulation assembly 31 further includes a first intake conduit 3121, a second intake conduit 3122, a third intake conduit 3123, and a fourth intake conduit 3124; the four intake pipelines are respectively provided with an EGR sensor I314, an EGR sensor II 315, an EGR sensor III 316 and an EGR sensor IV 317. Cylinder intake pipe valve 313 includes intake pipe valve one 3131, intake pipe valve two 3132, intake pipe valve three 3133, and intake pipe valve four 3134, which respectively control whether intake conduit one 3121, intake conduit two 3122, intake conduit three 3123, and intake conduit four 3124 communicate with cylinder one 111, cylinder two 112, cylinder three 113, and cylinder four 114, respectively, and EGR sensor one 314, EGR sensor two 315, EGR sensor three 316, and EGR sensor four 317 respectively monitor the flow and pressure of exhaust gas entering cylinder one 111, cylinder two 112, cylinder three 113, and cylinder four 114. According to the running condition of an engine in the actual running process of the vehicle, the cylinder air inlet pipe valve 313 can intelligently adjust the proportion of waste gas and air entering each cylinder 11, so that the unevenness of the waste gas of each cylinder is reduced, the optimal economic matching is achieved, the oil saving potential of the system is fully developed, and the limitation of the maximum EGR rate of a conventional waste gas recirculation system is broken.
Example two
As shown in fig. 2, the embodiment of the present invention provides a control method for a high EGR rate EGR system in the first embodiment, including the following steps:
step S1, starting the cold start of the automobile, enabling the engine to work, starting the engine oil heating exhaust pipeline valve 22, closing the EGR exhaust pipeline valve 34, enabling the engine oil heat exchanger 21 to work, and enabling all waste gas discharged by the discharge assembly 12 to be used for heating the engine oil;
when the automobile is started in a cold state, because the temperature of the engine water is far lower than the temperature during normal operation, the exhaust pipeline valve 34 is closed, so that the exhaust gas exhausted by the exhaust component 12 is heated for engine oil through the engine oil heating exhaust pipeline 23, the purpose of quickly warming is achieved, and the fuel consumption and the emission are reduced. Preferably, before the step S1, it is determined whether the engine is operating, and the step S1 is started when the engine is operating normally.
Step S2, detecting the oil temperature of the engine oil, and after the real-time oil temperature of the engine oil is higher than the lower limit of the engine oil temperature, opening the EGR exhaust pipeline valve 34 and continuously operating the engine oil heat exchanger 21;
according to the real-time monitoring temperature of the temperature sensor 24, the temperature of the engine oil rises to the lower limit T of the temperature of the engine oilWLThereafter, the EGR exhaust line valve 34 is opened to reduce the exhaust gas entering the engine oil heating exhaust line 23. As shown in FIG. 2, TWIndicating the real-time temperature, T, of the engine oilWLIndicates the lower limit of the temperature of the engine oil, TWHIndicating the upper limit of the oil temperature.
Step S3, when the real-time oil temperature of the engine oil is higher than the upper limit of the engine oil temperature, the engine oil heating exhaust pipeline valve 22 is closed, and the engine oil heat exchanger 21 stops working; the EGR heat exchanger 3211 works, the EGR valve 35 is closed, and the thermoelectric generator 3212 charges the storage battery 322 by using the energy of all the exhaust gases;
the temperature is monitored in real time according to the temperature sensor 24, and the temperature of the engine oil rises to the upper limit T of the temperature of the engine oilWHAfter that, the cold start phase is finished, the engine enters a normal operation phase, at this time, exhaust gas is no longer required for engine oil heating, at this time, the engine oil heating exhaust pipe valve 22 is closed, and the engine oil heat exchanger 21 stops working. The exhaust gas exhausted from the exhaust assembly 12 enters the recirculation device 3 through the EGR exhaust line 36, the EGR valve 35 is closed, the EGR heat exchanger 3211 is operated, and the thermoelectric generator 3212 charges the battery 322 by using the energy of the entire exhaust gas, so as to reach the target charge of the battery 322 as soon as possible.
Step S4, when the electric quantity of the storage battery 322 is larger than or equal to the lower charging limit of the storage battery, the thermoelectric generator 3212 continuously works to charge the storage battery 322, the EGR valve 35 is opened, and part of the exhaust gas enters the EGR storage tank 311 for circulating into the plurality of cylinders 11;
when the electric energy in the battery 322 reaches the battery lower charge limit SOCLAt times when the full exhaust energy is no longer needed, the EGR valve 35 is opened to allow a portion of the exhaust gas to enter the EGR storage tank 311 for recirculation into the plurality of cylinders 11. As shown in FIG. 2, the actual state of charge percentage of the battery 322 is SOC, and the battery lower charge limit SOC isLUpper limit of battery charge SOCH。
Step S5, when the electric quantity of the storage battery 322 is larger than or equal to the upper charging limit of the storage battery, the EGR heat exchanger 3211 stops working, and all the exhaust gas enters the EGR storage tank 311 for circulating to the plurality of cylinders 11;
during the continuous charging of the battery 322, when the actual charge SOC of the battery 322 reaches the upper limit SOC of the battery chargeHAt this time, the battery 322 does not need to be charged continuously, so that damage to the battery 322 and energy waste caused by overcharging are avoided. The EGR heat exchanger 3211 is deactivated and all exhaust gas enters the EGR storage tank 311 for circulation into the plurality of cylinders 11.
And step S6, when the electric quantity of the storage battery 322 is reduced to the lower charging limit of the storage battery, repeating the step S4 to the step S5. Through the real-time monitoring to battery 322 electric quantity, can realize the intelligent management to waste gas energy.
Further, simultaneously with the above step S4 and step S5, the method further includes the steps of:
the SS1 and the EGR pump 323 operate to pressurize the exhaust gas in the EGR tank 311, and regulate the flow rate of the exhaust gas entering the cylinders 11 through the cylinder intake pipe valves 313 according to the target EGR rates of the cylinders 11; when the required power of the EGR pump 323 is larger than the power of the thermoelectric generator 3212, the parallel switch 324 and the series switch 325 are communicated, and the storage battery 322 and the thermoelectric generator 3212 jointly drive the EGR pump 323; when the required power of the EGR pump 323 is less than or equal to the power of the thermoelectric generator 3212, the parallel switch 324 is turned off, and the thermoelectric generator 3212 drives the EGR pump 323.
When the charge of the battery 322 reaches the battery charge lower limit, the EGR pump 323 starts to pressurize the exhaust gas in the EGR tank 311, and the exhaust gas is circulated. Through intake pipe valve one 3131, intake pipe valve two 3132, intake pipe valve three 3133 and intake pipe valve four 3134 on intake pipe one 3121, intake pipe two 3122, intake pipe valve three 3123 and intake pipe valve four 3124, the flow rate of exhaust gas into cylinder one 111, cylinder two 112, cylinder three 113 and cylinder four 114, respectively, is intelligently and precisely adjusted, and EGR sensor one 314, EGR sensor two 315, EGR sensor three 316 and EGR sensor four 317 monitor the flow rate and pressure of exhaust gas into cylinder one 111, cylinder two 112, cylinder three 113 and cylinder four 114, respectively, and perform feedback. According to the real-time combustion stability and the air-fuel ratio in the cylinders, the proportion of the waste gas and the air of each cylinder is intelligently and accurately controlled, the target EGR rate is achieved, the maximum EGR rate can reach 50%, and the problem of uneven EGR rate of each cylinder is solved. As shown in FIG. 2, CY1 represents cylinder one 111, CY2 represents cylinder two 112, CY3 represents cylinder three 113, and CY4 represents cylinder four 114, and the system adopts PID control, so that the accuracy is higher. How to realize the PID control by the sensor and the pipe valve is the prior art in the field, and the description of the embodiment is omitted here.
According to the power required by the EGR pump 323, the parallel switch 324 and the series switch 325 can intelligently control the mode that the storage battery 322 and the thermoelectric generator 3212 drive the EGR pump 323, so that the energy of the exhaust gas can be more efficiently utilized. As shown in FIG. 2, P is the power demand of the EGR pump 323, PWGenerating power for the temperature difference; when the required power of the EGR pump 323 is larger than the power of the thermoelectric generator 3212, the parallel switch 324 and the series switch 325 are communicated, and the storage battery 322 and the thermoelectric generator 3212 jointly drive the EGR pump 323; when the required power of the EGR pump 323 is less than or equal to the power of the thermoelectric generator 3212, the parallel switch 324 is turned off, and the thermoelectric generator 3212 drives the EGR pump 323.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A high EGR rate exhaust gas recirculation system, comprising:
an exhaust device (1), the exhaust device (1) comprising a plurality of cylinders (11) and an exhaust assembly (12), the exhaust assembly (12) communicating with exhaust ports of the cylinders (11), the exhaust assembly (12) being configured to exhaust gas generated by the cylinders (11);
an oil heating device (2), the oil heating device (2) including an oil heat exchanger (21), the oil heat exchanger (21) communicating with the drain assembly (12), the oil heat exchanger (21) being configured to heat oil using the exhaust gas; and
a recirculation device (3), the recirculation device (3) comprising:
the circulation assembly (31) comprises an EGR storage tank (311) and a plurality of air inlet pipelines (312), wherein an air inlet of the EGR storage tank (311) is communicated with the discharge assembly (12), an air outlet of the EGR storage tank (311) is communicated with one ends of the plurality of air inlet pipelines (312) respectively, and the other ends of the plurality of air inlet pipelines (312) are communicated with air inlets of the plurality of cylinders (11) respectively;
an electric storage assembly (32), the electric storage assembly (32) comprising a power generation mechanism (321), a storage battery (322), and an EGR pump (323), the power generation mechanism (321) communicating with the exhaust assembly (12), the power generation mechanism (321) configured to charge the storage battery (322) using energy of the exhaust gas, the storage battery (322) and the power generation mechanism (321) electrically connected to the EGR pump (323), the EGR pump (323) communicating with the EGR storage tank (311), the EGR pump (323) configured to pressurize the exhaust gas within the EGR storage tank (311).
2. The high EGR rate exhaust gas recirculation system of claim 1, wherein the power generation mechanism (321) comprises:
an EGR heat exchanger (3211), the EGR heat exchanger (3211) communicating with the exhaust assembly (12);
a thermoelectric generator (3212), the thermoelectric generator (3212) being in communication with the EGR heat exchanger (3211) and electrically connected to the battery (322), the thermoelectric generator (3212) being configured to convert energy of the exhaust gas into electric energy.
3. The high EGR rate exhaust gas recirculation system of claim 2, wherein the electrical storage assembly (32) further comprises a parallel switch (324) and a series switch (325), wherein two ends of the parallel switch (324) are electrically connected to the battery (322) and the EGR pump (323), respectively, and two ends of the series switch (325) are electrically connected to the thermoelectric generator (3212) and the EGR pump (323), respectively.
4. The high EGR rate exhaust gas recirculation system according to claim 3, wherein the oil heating device (2) further comprises an oil heating exhaust line valve (22), and both ends of the oil heating exhaust line valve (22) communicate with the drain assembly (12) and the oil heat exchanger (21), respectively.
5. The high EGR rate exhaust gas recirculation system according to claim 4, wherein the recirculation device (3) further comprises an energy conversion tank (33), one end of the energy conversion tank (33) is communicated with the exhaust component (12), and the other end is connected in parallel with the circulation component (31) and the electricity storage component (32).
6. The high EGR rate exhaust gas recirculation system according to claim 5, wherein the recirculation device (3) further comprises an EGR exhaust line valve (34), both ends of the EGR exhaust line valve (34) respectively communicating the exhaust assembly (12) and the energy conversion tank (33).
7. The high EGR rate exhaust gas recirculation system of claim 6, wherein the recirculation device (3) further comprises an EGR valve (35), and both ends of the EGR valve (35) communicate with the energy conversion tank (33) and the EGR storage tank (311), respectively.
8. The high EGR rate exhaust gas recirculation system of claim 7, wherein the circulation assembly (31) further comprises a plurality of cylinder intake pipe valves (313), one end of each of the plurality of cylinder intake pipe valves (313) communicating with the EGR storage tank (311) and the other end communicating with the plurality of cylinders (11), respectively.
9. A control method for controlling the high EGR rate exhaust gas recirculation system according to claim 1, characterized by comprising the steps of:
step S1, starting cold start of the automobile, enabling the engine to work, starting the engine oil heating exhaust pipeline valve (22), closing the EGR exhaust pipeline valve (34), enabling the engine oil heat exchanger (21) to work, and enabling all exhaust gas discharged by the discharge assembly (12) to be used for heating the engine oil;
step S2, detecting the oil temperature of the engine oil, and when the actual oil temperature of the engine oil is higher than the lower limit of the engine oil temperature, opening the EGR exhaust pipeline valve (34), so that the engine oil heat exchanger (21) continuously works;
step S3, when the actual oil temperature of the engine oil is higher than the upper limit of the engine oil temperature, the engine oil heating exhaust pipeline valve (22) is closed, and the engine oil heat exchanger (21) stops working; the EGR heat exchanger (3211) works, the EGR valve (35) is closed, and the thermoelectric generator (3212) charges the storage battery (322) by using the energy of all the exhaust gas;
step S4, when the electric quantity of the storage battery (322) is larger than or equal to the lower charging limit of the storage battery, the EGR heat exchanger (3211) works continuously, the thermoelectric generator (3212) charges the storage battery (322) continuously, the EGR valve (35) is opened, and part of exhaust gas enters an EGR storage tank (311) for circulating to a plurality of cylinders (11);
step S5, when the electric quantity of the storage battery (322) is larger than or equal to the upper charging limit of the storage battery, the EGR heat exchanger (3211) stops working, and all the exhaust gas enters the EGR storage tank (311) for circulating to a plurality of cylinders (11);
and step S6, when the electric quantity of the storage battery (322) is reduced to the lower charging limit of the storage battery, repeating the step S4 to the step S5.
10. The control method according to claim 9, further comprising, simultaneously with the step S4 and the step S5, the steps of:
SS1, an EGR pump (323) works, exhaust gas in the EGR storage tank (311) is pressurized, and the flow rate of the exhaust gas entering a plurality of cylinders (11) is adjusted through a plurality of cylinder inlet pipe valves (313) according to the target EGR rate of the cylinders (11); when the required power of the EGR pump (323) is larger than the power of the thermoelectric generator (3212), connecting a parallel switch (324) and a series switch (325), and driving the EGR pump (323) by the storage battery (322) and the thermoelectric generator (3212) together; when the required power of the EGR pump (323) is less than or equal to the power of the thermoelectric generator (3212), the parallel switch (324) is opened, and the thermoelectric generator (3212) drives the EGR pump (323).
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