CN115059562A - EGR mixer, EGR system and control method thereof - Google Patents

EGR mixer, EGR system and control method thereof Download PDF

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Publication number
CN115059562A
CN115059562A CN202210579049.1A CN202210579049A CN115059562A CN 115059562 A CN115059562 A CN 115059562A CN 202210579049 A CN202210579049 A CN 202210579049A CN 115059562 A CN115059562 A CN 115059562A
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China
Prior art keywords
egr
temperature
engine
inlet
mixer
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Granted
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CN202210579049.1A
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Chinese (zh)
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CN115059562B (en
Inventor
王占峰
李春雨
宋敏
韩令海
李金成
宫艳峰
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FAW Group Corp
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FAW Group Corp
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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
    • F02M26/17—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
    • 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
    • F02M26/13—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
    • F02M26/20—Feeding recirculated exhaust gases directly into the combustion chambers or into the intake runners
    • 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
    • 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
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
    • 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
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • 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
    • F02M26/33—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 controlling the temperature of the recirculated gases
    • 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
    • F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
    • 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
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
    • 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
    • F02M26/65—Constructional details of EGR valves

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

Abstract

The invention discloses an EGR mixer, an EGR system and a control method thereof, wherein the EGR mixer comprises a shell, an air inlet and a waste gas inlet are arranged above the shell, a waste gas outlet is arranged at the bottom of the shell, an inlet guide vane is arranged at the waste gas inlet and is connected with a motor through a connecting rod, an inner cavity is arranged in the shell, a hole pattern matrix structure is arranged in the inner cavity, and air and waste gas form mixed gas in the inner cavity. According to the invention, the EGR mixer is arranged in the air inlet pipe of the engine, so that the uniformity and response speed of EGR are improved, the EGR rate is flexibly controlled, and meanwhile, the temperature of the mixed gas can be adjusted through the temperature adjusting device, so that the purposes of reducing oil consumption and improving emission are achieved.

Description

EGR mixer, EGR system and control method thereof
Technical Field
The invention relates to the technical field of EGR control of vehicles, in particular to an EGR mixer, an EGR system and a control method of the EGR system.
Background
With the development of internal combustion engine technology, the engine is developed towards high thermal efficiency and low emission under the large background of carbon neutralization. Exhaust Gas Recirculation (EGR) is an effective measure to reduce NOx Gas production in the engine cylinders. The working principle is as follows: part of the exhaust gas of the engine is cooled and then sent back to the engine cylinder to participate in the combustion process. The gas composition in the combustion chamber comes from two parts, one part is fresh air cooled by an intercooler, and the other part is exhaust gas cooled by an EGR cooler after gas is taken from an exhaust manifold.
The main way of introducing EGR in the air inlet pipe in the prior art is to adopt a three-way type, namely an EGR pipe is directly connected with a throat section of a Venturi mixer. However, the three-way mixer directly communicates the EGR pipe with the throat section, and only introduces EGR gas at one side of the intake pipe, which may cause too high concentration of local EGR gas in the cross section of the entire intake pipe, and may not achieve uniform mixing of exhaust gas and fresh air or fresh air mixture, resulting in non-uniform EGR distribution of each cylinder. EGR is unevenly distributed among the cylinders, which worsens the NOx and Particulate Matter (PM) tradeoff, i.e., reducing NOx as much results in more smoke, reduces EGR effectiveness in reducing emissions, and also results in increased fuel consumption.
In summary, one of the technical problems that needs to be urgently solved by those skilled in the art is: the EGR gas and the fresh air are uniformly mixed, the EGR is uniformly distributed in each cylinder, and the qualified EGR rate of the fuel engine can be achieved under the condition of high load.
Disclosure of Invention
The disclosure provides an EGR mixer, an EGR system and a control method thereof, which at least solve the technical problem that the existing EGR system can not realize uniform mixing of EGR gas and fresh air.
According to an aspect of an embodiment of the present invention, an EGR mixer is provided, which includes a housing, an air inlet and an exhaust gas inlet are disposed above the housing, an exhaust gas outlet is disposed at a bottom of the housing, an inlet guide vane is disposed at the exhaust gas inlet, the inlet guide vane is connected to a motor through a connecting rod, an inner cavity is disposed in the housing, a hole pattern matrix structure is disposed in the inner cavity, and air and exhaust gas form a mixture in the inner cavity.
In an exemplary embodiment, a temperature adjusting channel is arranged on the inner wall of the shell, the temperature adjusting channel is connected with a temperature adjusting and heat preserving cavity positioned outside the shell, and a heating device is arranged in the temperature adjusting and heat preserving cavity.
In an exemplary embodiment, the temperature-regulating passage has a water inlet end and a water outlet end, the water inlet end is located above the water outlet end, and the temperature-regulating warm-keeping chamber is connected with the water inlet end of the temperature-regulating passage through a water outlet pipeline and connected with the water outlet end of the temperature-regulating passage through a water inlet pipeline.
In an exemplary embodiment, an outlet water control valve is provided on the outlet line and/or an inlet water control valve is provided on the inlet line.
In an exemplary embodiment, the temperature-regulating passage is arranged in a serpentine shape on the inner wall.
In one exemplary embodiment, the housing has a shape that is wide at the top and narrow at the bottom.
In a second aspect, the present disclosure provides an EGR system, which includes an engine and the EGR mixer in any one of the above technical solutions, wherein the EGR mixer is disposed on an intake pipeline of the engine, and the EGR mixer is connected with an exhaust pipeline of the engine through an exhaust pipeline.
In an exemplary embodiment, an EGR valve and an EGR cooler are provided on the exhaust gas line.
In a third aspect, the present disclosure also provides a control method of an EGR mixer that is provided on an intake line of the engine and is connected to an exhaust line of the engine through a pipe, air and exhaust gas forming a mixture in the EGR mixer, the control method comprising: acquiring the operating temperature of the engine; cooling the mixture when the operating temperature is above a first threshold and/or heating the mixture when the operating temperature is below a second threshold.
In a fourth aspect, the present disclosure further provides a control method of an EGR mixer in any one of the above technical solutions, the EGR mixer being disposed on an intake pipe of the engine and connected to an exhaust pipe of the engine through a pipeline, the control method comprising: determining an EGR condition of the engine; when the EGR working condition is the condition that the EGR increases the working condition, the opening degree of the inlet guide vane is increased and/or when the EGR working condition is the condition that the EGR decreases the working condition, the opening degree of the inlet guide vane is decreased and/or when the EGR working condition is the condition that the EGR stops the working condition, the vanes are controlled to be closed.
From the above, in the present disclosure, by providing the EGR mixer in the intake pipe of the engine, the uniformity and response speed of the EGR are improved, the EGR rate is flexibly controlled, and meanwhile, the temperature of the mixture can be adjusted by the temperature adjusting device, so as to achieve the purposes of reducing the oil consumption and improving the emission.
In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic illustration of an EGR mixer of an engine EGR system provided by the present disclosure;
FIG. 2A is a schematic view of a fully open condition of an inlet guide vane provided by the present disclosure;
FIG. 2B is a schematic view of a fully closed condition of the inlet guide vanes provided by the present disclosure;
FIG. 3 is a schematic block diagram of an EGR system for use in an engine provided by the present disclosure;
FIG. 4 is a control flow diagram of a control method of an EGR mixer provided by the present disclosure;
fig. 5 is a control flowchart of a control method of an EGR mixer according to another embodiment provided by the present disclosure.
Detailed Description
Specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, but the present disclosure is not limited thereto.
It will be understood that various modifications may be made to the embodiments disclosed herein. Accordingly, the foregoing description should not be construed as limiting, but merely as exemplifications of embodiments. Other modifications will occur to those skilled in the art within the scope and spirit of the disclosure.
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the disclosure and, together with a general description of the disclosure given above, and the detailed description of the embodiments given below, serve to explain the principles of the disclosure.
These and other characteristics of the present disclosure will become apparent from the following description of preferred forms of embodiment, given as non-limiting examples, with reference to the attached drawings.
It should also be understood that, although the present disclosure has been described with reference to some specific examples, a person of skill in the art shall certainly be able to achieve many other equivalent forms of the disclosure, having the characteristics as set forth in the claims and hence all coming within the field of protection defined thereby.
The above and other aspects, features and advantages of the present disclosure will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.
Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are merely examples of the disclosure that may be embodied in various forms. Well-known and/or repeated functions and structures have not been described in detail so as not to obscure the present disclosure with unnecessary or unnecessary detail. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure in virtually any appropriately detailed structure.
It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein are capable of operation in other sequences than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may each refer to one or more of the same or different embodiments in accordance with the disclosure.
The present disclosure is further described with reference to the following figures and specific examples.
Example 1
A first aspect of the present disclosure provides an EGR mixer for use in an engine intake system with EGR. EGR here refers to a process in which a part of exhaust gas of an engine is cooled and then returned to an engine cylinder through an engine intake system to participate in a combustion process, thereby reducing the combustion temperature and suppressing the generation of NOx.
If the mixing is uneven during the mixing process of the combusted exhaust gas and the fresh air, the EGR distribution of each cylinder is uneven, the effect of EGR on reducing the emission is reduced, and the fuel consumption is increased. The purpose of the disclosed embodiment is to promote the combusted exhaust gas and fresh air to be uniformly mixed, and ensure that EGR is uniformly distributed in each cylinder.
To promote uniformity in mixing of combusted exhaust gas with fresh air, embodiments of the present disclosure provide an EGR mixer. As shown in fig. 1, fig. 1 is a schematic structural diagram of an EGR mixer of an EGR system of an engine in an embodiment of the present disclosure, the EGR mixer includes a housing 1, the housing 1 is used for providing a space for mixing combusted exhaust gas with fresh air, an air inlet 2 and an exhaust gas inlet 3 are arranged above the housing 1, the fresh air enters the housing through the air inlet 2, the exhaust gas exhausted from a cylinder after combustion enters the housing through the exhaust gas inlet 3, an exhaust gas outlet 4 is arranged at the bottom of the housing 1 for exhausting a fully mixed mixer from the housing 1, an inlet guide vane 5 is arranged at the exhaust gas inlet 3, the inlet guide vane 5 is connected with a motor 7 through a connecting rod 6, the motor can adjust the opening degree of the inlet guide vane through the connecting rod, an inner cavity 8 is arranged in the housing 1, a hole-type matrix structure 9 is arranged on the inner cavity 8, and air and waste gas form mixed gas in the inner cavity 8.
Generally, the housing 1 of the mixer is used for accommodating the internal components of the mixer and providing a space for fully mixing the fresh air and the combusted exhaust gas entering the mixer, the housing 1 may be configured to be wide at the top and narrow at the bottom, and the air inlet 2 and the exhaust gas inlet 3 are respectively located at the upper wide side of the housing 1, and may be configured to be arranged at the upper part of the housing 1 in a Y-shaped structure, or may be arranged at an angle of 90 degrees at the upper part of the housing 1. The exhaust gas outlet 4 is disposed at the lower narrow-mouth side of the housing 1. The inside of casing 1 is provided with inner chamber 8 set up pass type matrix structure 9 on the inner chamber 8, follow air inlet 2 with waste gas air inlet 3 gets into fresh air and exhaust in the casing 1 are in mix the back in the inner chamber 8, pass through pass type structure 9 get into by casing 1 with in the passageway that the inner chamber is constituteed, via again waste gas air outlet 4 discharges the blender. Through pass structure 9, can make the gas mixture mix more evenly, further ensure EGR at each jar evenly distributed.
In order to improve the uniformity of the mixer, the hole array structure 9 may be configured as a rectangle formed by uniformly arranging a plurality of holes, or may be configured as a symmetrical structure or an asymmetrical structure arranged at intervals, and the sizes of the holes may be the same or different. In some embodiments, elongated slot structures may also be used in place of the hole array structures.
Furthermore, an inlet guide vane 5 with adjustable opening degree is installed in the waste gas inlet 3, the opening degree of the inlet guide vane 5 is different, and the gas quantity and the gas flow direction entering the EGR mixer shell are also different. The inlet guide vanes 5 may include a plurality of blades, each of which is adjustable in opening degree. Referring to fig. 2A, the guide vanes are fully closed, and referring to fig. 2B, the guide vanes are fully open, i.e., the opening degree is 0 degrees. The inlet guide vane 5 is connected to the motor through a connecting rod, and the motor and the connecting rod form a guide vane adjusting mechanism to control the opening degree of the guide vane. The motor controls the rotation angle of the connecting rod to drive the opening of the inlet guide vane 5 to change, the actual flow area is adjusted, and then the amount of waste gas entering the EGR mixer is adjusted, so that the EGR rate is adjusted. For example, when the engine needs to reduce the EGR rate, the flow area of the exhaust gas inlet can be reduced by reducing the guide vane opening degree, thereby reducing the amount of exhaust gas entering the EGR mixer, and finally reducing the EGR rate of the engine.
Of course, the adjusting mode of the inlet guide vane 5 may also adopt other modes in the prior art, as long as the opening degree of the inlet guide vane 5 can be adjusted. Such as the guide vanes and their manner of adjustment provided in CN 201475041U.
In order to avoid the internal icing of the EGR mixer, and simultaneously improve the cold start performance of the engine, a temperature adjusting channel 10 is arranged on the inner wall of the shell 1, the temperature adjusting channel 10 is connected with a temperature adjusting and heat preserving cavity 11 positioned outside the shell 1, a heating device 12 is arranged at the bottom of the temperature adjusting and heat preserving cavity 11, and the heating device is powered by a battery system 19 to heat water in the heat preserving cavity. The temperature adjusting channel 10 is provided with a water inlet end 13 and a water outlet end 14, the water inlet end 13 is positioned above the water outlet end 14, the temperature adjusting and heat preserving cavity 11 is connected with the water inlet end 13 of the temperature adjusting channel 10 through a water outlet pipeline 15 and is connected with the water outlet end 14 of the temperature adjusting channel 10 through a water inlet pipeline 16, and the temperature adjusting channel 10 and the temperature adjusting and heat preserving box form a circulating water path through the water outlet pipeline 15 and the water inlet pipeline 16. Through the water outlet pipeline 15, water in the temperature-adjusting and heat-preserving cavity can enter the temperature-adjusting channel 10 to exchange heat with the mixed gas in the shell 1, the water after heat exchange enters the water inlet pipeline 16 from the water outlet end 14 and finally returns to the temperature-adjusting and heat-preserving cavity, and a water pump is further arranged on the water outlet pipeline 15.
In some embodiments, an outlet control valve 17 is further disposed on the outlet pipe 15, and an inlet control valve 18 is further disposed on the inlet pipe 16, and the flow rates of the outlet pipe 15 and the inlet pipe can be controlled by the outlet control valve 17 and the inlet control valve 18.
In order to control the temperature of the water in the temperature-adjusting heat-preserving chamber 11, a temperature sensor may be further disposed in the temperature-adjusting heat-preserving chamber 11, the temperature of the water in the temperature-adjusting heat-preserving chamber is obtained through the temperature sensor, and the heating device 12 is controlled to heat the water in the temperature-adjusting heat-preserving chamber 11 based on the temperature of the water.
In order to further improve the heat exchange effect between the water and the mixed gas in the temperature adjusting channel, the temperature adjusting channel is arranged on the inner wall in a snake shape or a spiral shape or a labyrinth shape.
The operation principle and process of the EGR mixer will be described with reference to fig. 3. Fig. 3 is a schematic structural diagram of an EGR system used in an engine, as shown in the figure, the engine includes a cylinder 21, and an intake manifold 22 and an exhaust manifold 23 connected to the cylinder 21, the intake manifold 22 and the exhaust manifold 23 are respectively connected to an intake pipe and an exhaust pipe of the engine, the intake pipe is sequentially connected to an air filter 25, an EGR mixer 20 and a throttle valve 32, the exhaust pipe is provided with a three-way catalyst 24, and the EGR mixer 20 is connected to the exhaust pipe by a bypass through an exhaust gas pipe 26. The engine is also provided with an air inlet temperature sensor 29, a rotating speed sensor 30 and a load sensor 31, wherein the air inlet temperature sensor 29, the rotating speed sensor 30 and the load sensor 31 are connected with a signal processor 27 in a wiring harness mode, the signal processor 27 transmits signals to a controller 28, and the controller 28 controls the EGR mixer 20 to work based on the signals.
EGR blender 20 air inlet 2 with air cleaner 25's air outlet connects, waste gas air inlet 3 with exhaust gas line connects, gas mixture export 4 and the intake-tube connection of engine, follow through the exhaust of burning exhaust gas line gets into the EGR blender, with follow the fresh air that air inlet 2 got into mixes, and the gas mixture is in after mixing in EGR blender's the inner chamber 8, process pass type structure 9 get into by casing 1 with in the passageway that the inner chamber is constituteed, through with water in the passageway 10 that adjusts the temperature carries out the heat exchange back, via waste gas outlet 4 gets into in the intake pipe of engine, finally get into burn in the cylinder 21.
The EGR mixer provided by the embodiment of the disclosure is characterized in that an air inlet and an exhaust gas inlet are arranged above the shell, an exhaust gas outlet is arranged at the bottom of the shell, blades are arranged at the exhaust gas inlet, an inner cavity with a hole pattern matrix structure is arranged in the shell, air and exhaust gas are enabled to be fully mixed in the inner cavity to form uniform mixed gas, the uniformity and the response speed of EGR are improved, the EGR rate can be flexibly controlled through the opening degree of the adjusting blades, the temperature of the mixed gas can be adjusted through a temperature adjusting device, and the purposes of reducing oil consumption and improving emission are achieved.
Example 2
The second aspect of the present disclosure also provides an EGR system, which is applied to an intake system of an engine, and includes the engine and the EGR mixer described in any one of the above embodiments.
Specifically, the EGR mixer 20 is provided on an intake air line of the engine, the air intake port 2 of the EGR mixer 20 is connected to an air outlet of an air filter 25 of the engine, the exhaust gas intake port 3 of the EGR mixer is connected to an exhaust gas line of the engine, and the mixture outlet 4 of the EGR mixer is connected to an intake air line of the engine. The combusted exhaust enters the EGR mixer 20 from the exhaust gas pipeline 26, is mixed with fresh air entering from the air inlet 2, is mixed in the inner cavity 8 of the EGR mixer 20, enters a channel consisting of the shell 1 and the inner cavity 8 through the hole-shaped structure 9, exchanges heat with water in the temperature adjusting channel 10, enters an air inlet pipe of the engine through the exhaust gas outlet 4, and finally enters the cylinder 21 for combustion.
In an exemplary embodiment, an EGR valve is provided on the exhaust gas line, by means of which EGR valve the flow of exhaust gas into the EGR mixer can be regulated in the event of a failure of the guide vanes.
Optionally, the EGR system further comprises an EGR cooler disposed in the exhaust line.
The EGR mixer provided by the embodiment of the disclosure is characterized in that an air inlet and an exhaust gas inlet are arranged above the shell, an exhaust gas outlet is arranged at the bottom of the shell, blades are arranged at the exhaust gas inlet, an inner cavity with a hole pattern matrix structure is arranged in the shell, air and exhaust gas are enabled to be fully mixed in the inner cavity to form uniform mixed gas, the uniformity and the response speed of EGR are improved, the EGR rate can be flexibly controlled through the opening degree of the adjusting blades, the temperature of the mixed gas can be adjusted through a temperature adjusting device, and the purposes of reducing oil consumption and improving emission are achieved.
Example 3
In order to secure a mixing effect of exhaust gas and exhaust gas in the EGR mixer, a third aspect of the present disclosure also provides a control method of an EGR mixer that is provided on an intake line of the engine and connected to an exhaust line of the engine through a line, and in which air and exhaust gas form a mixture, as shown in the drawing, the control method comprising:
and S101, acquiring the running temperature of the engine.
In this step, the operating temperature of the engine is obtained. The engine temperature here refers to the temperature of the engine intake system, which is collected by an intake air temperature sensor 29 provided in the engine intake pipe.
S102, cooling the mixed gas under the condition that the operation temperature is higher than a first threshold value and/or heating the mixed gas under the condition that the operation temperature is lower than a second threshold value.
After the completion of the above step S101, the EGR mixer is controlled to operate based on the obtained operating temperature of the engine. In particular, the mixture is cooled when the operating temperature is higher than a first threshold value and/or heated when the operating temperature is lower than a second threshold value.
When the operating temperature is higher than the first threshold value, the engine works under a high-temperature working condition or a normal working condition, and at the moment, in order to reduce the temperature of exhaust gas entering an engine cylinder, the mixed gas entering an engine air inlet pipe through the EGR mixer is cooled.
At this time, the normal temperature water in the temperature-adjusting and heat-preserving cavity of the EGR mixer enters the temperature-adjusting passage 10 from the water inlet end 14 of the temperature-adjusting passage 10 through the water inlet pipeline 16 under the action of the water pump, and after absorbing the heat of the air-fuel mixture in the EGR mixer in the temperature-adjusting passage 10, the normal temperature water flows out from the water outlet end 14 of the temperature-adjusting passage 10 and returns to the temperature-adjusting and heat-preserving cavity through the water inlet pipeline 16. At the moment, the heating device does not work, and the temperature-adjusting and heat-preserving cavity does not start the heat-preserving function after the engine is stopped.
Alternatively, the effect of the cold zone on the exhaust gas can also be intensified by an EGR cooler arranged in the exhaust line.
When the operating temperature is lower than a second threshold value, the engine works in a cold start stage or in a low-temperature working condition. In order to avoid icing of the EGR mixture, the engine is assisted in starting, in which case the mixture entering the EGR mixer is heated.
Specifically, water in the temperature-adjusting and heat-preserving chamber of the EGR mixer enters the temperature-adjusting channel 10 from the water inlet end 14 of the temperature-adjusting channel 10 through the water inlet pipeline 16 under the action of the water pump, and after the mixture in the EGR mixer is heated in the temperature-adjusting channel 10, the water flows out from the water outlet end 14 of the temperature-adjusting channel 10 and returns to the temperature-adjusting and heat-preserving chamber through the water inlet pipeline 16. At the moment, the heating device heats water in the temperature-adjusting and heat-preserving cavity, and the temperature-adjusting and heat-preserving cavity starts a heat-preserving function after the engine is shut down, so that the water in the temperature-adjusting and heat-preserving cavity is at a fixed temperature, for example, 50 ℃.
The EGR mixer provided by the embodiment of the disclosure is characterized in that an air inlet and an exhaust gas inlet are arranged above the shell, an exhaust gas outlet is arranged at the bottom of the shell, blades are arranged at the exhaust gas inlet, an inner cavity with a hole pattern matrix structure is arranged in the shell, air and exhaust gas are enabled to be fully mixed in the inner cavity to form uniform mixed gas, the uniformity and the response speed of EGR are improved, the EGR rate can be flexibly controlled through the opening degree of the adjusting blades, the temperature of the mixed gas can be adjusted through a temperature adjusting device, and the purposes of reducing oil consumption and improving emission are achieved.
Example 4
In a fourth aspect, the present disclosure further provides a control method of an EGR mixer, where the EGR mixer is the EGR mixer described in any one of the above embodiments, and the EGR mixer is disposed on an intake pipe of an engine and connected to an exhaust pipe of the engine through a pipeline, and the control method includes:
s201, determining an EGR working condition of the engine.
In this step, an EGR condition of the engine is determined. Where EGR conditions refer to a demand for EGR from the engine, i.e., a need to increase or decrease an EGR rate, the step of determining the EGR conditions for the engine includes:
the rotating speed and the load of the engine are obtained, and in the disclosure, the rotating speed value and the load value of the engine are obtained through a rotating speed sensor and a load sensor.
And after the rotating speed value and the load value of the engine are obtained, the EGR working condition of the engine is obtained by inquiring an EGR strategy table.
S202, when the EGR working condition is the EGR increasing working condition, the opening degree of the inlet guide vane is increased, and/or when the EGR working condition is the EGR decreasing working condition, the opening degree of the inlet guide vane is decreased, and/or when the EGR working condition is the EGR stopping working condition, the vanes are controlled to be closed.
After the EGR condition is determined, in this step, the opening degree of the vanes is controlled according to the EGR condition so as to obtain the required EGR rate.
Specifically, when the EGR working condition is the EGR increasing working condition, the opening degree of the blade is increased, and the effective sectional area of the exhaust gas inlet is enlarged, so that the amount of exhaust gas entering the EGR mixer is increased, and the EGR rate of the engine is increased.
When the EGR working condition is the EGR reduction working condition, the opening degree of the blade is reduced, and the effective sectional area of the waste gas inlet is reduced, so that the amount of waste gas entering the EGR mixer is reduced, and the EGR rate of the engine is reduced.
And when the EGR working condition is the EGR stop working condition, controlling the blades to be closed, and no longer providing exhaust gas for an air inlet system of the engine.
The EGR mixer provided by the embodiment of the disclosure is characterized in that an air inlet and an exhaust gas inlet are arranged above the shell, an exhaust gas outlet is arranged at the bottom of the shell, blades are arranged at the exhaust gas inlet, an inner cavity with a hole pattern matrix structure is arranged in the shell, air and exhaust gas are enabled to be fully mixed in the inner cavity to form uniform mixed gas, the uniformity and the response speed of EGR are improved, the EGR rate can be flexibly controlled through the opening degree of the adjusting blades, the temperature of the mixed gas can be adjusted through a temperature adjusting device, and the purposes of reducing oil consumption and improving emission are achieved.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may also be oriented 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.
In addition to the foregoing, it should be noted that reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally throughout this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a EGR blender, its includes the casing the top of casing sets up air inlet and waste gas air inlet the bottom of casing sets up the waste gas outlet, its characterized in that waste gas air inlet department sets up the import stator, the import stator passes through the connecting rod and is connected with the motor set up the inner chamber in the casing set up the pass matrix structure in the inner chamber, air and waste gas are in form the gas mixture in the inner chamber.
2. The EGR mixer of claim 1, wherein a temperature-regulating passage is provided on an inner wall of the housing, the temperature-regulating passage being connected to a temperature-regulating warm-keeping chamber located outside the housing, and a heating device is provided in the temperature-regulating warm-keeping chamber.
3. The EGR mixer of claim 2 wherein the temperature-regulating passage has an inlet end and an outlet end, the inlet end being positioned above the outlet end, and the temperature-regulating warm-keeping chamber is connected to the inlet end of the temperature-regulating passage by an outlet conduit and to the outlet end of the temperature-regulating passage by an inlet conduit.
4. The EGR mixer of claim 3 wherein an outlet control valve is provided on the outlet line and/or an inlet control valve is provided on the inlet line.
5. The EGR mixer of claim 2 wherein the attemperation channel is serpentine in arrangement on the inner wall.
6. The EGR mixer of claim 1 wherein the housing has a shape that is wide at the top and narrow at the bottom.
7. An EGR system, characterized in that it comprises an engine and an EGR mixer according to any of claims 1-6, which EGR mixer is arranged in the intake line of the engine, which EGR mixer is connected to the exhaust line of the engine by means of an exhaust line.
8. The EGR system of claim 7 wherein an EGR valve and an EGR cooler are disposed on the exhaust gas conduit.
9. A control method of an EGR mixer that is provided on an intake line of an engine and is connected to an exhaust line of the engine through a line, air and exhaust gas forming a mixture in the EGR mixer, the control method comprising:
acquiring the operating temperature of the engine;
cooling the mixture when the operating temperature is above a first threshold value and/or heating the mixture when the operating temperature is below a second threshold value.
10. A control method of an EGR mixer that is the EGR mixer according to any one of claims 1 to 8, provided on an intake line of the engine and connected to an exhaust line of the engine through a line, the control method comprising:
determining an EGR condition of the engine;
when the EGR working condition is the condition that the EGR increases the working condition, the opening degree of the inlet guide vane is increased and/or when the EGR working condition is the condition that the EGR decreases the working condition, the opening degree of the inlet guide vane is decreased and/or when the EGR working condition is the condition that the EGR stops the working condition, the vanes are controlled to be closed.
CN202210579049.1A 2022-05-25 2022-05-25 EGR (exhaust gas recirculation) mixer, EGR system and control method of EGR system Active CN115059562B (en)

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