CN110566380A - Controllable EGR system of integrated cold, hot EGR valve - Google Patents
Controllable EGR system of integrated cold, hot EGR valve Download PDFInfo
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- CN110566380A CN110566380A CN201910690011.XA CN201910690011A CN110566380A CN 110566380 A CN110566380 A CN 110566380A CN 201910690011 A CN201910690011 A CN 201910690011A CN 110566380 A CN110566380 A CN 110566380A
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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
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
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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
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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
- F02M26/21—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
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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
- F02M26/22—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
- F02M26/23—Layout, e.g. schematics
- F02M26/27—Layout, e.g. schematics with air-cooled heat exchangers
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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
- F02M26/22—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
- F02M26/23—Layout, e.g. schematics
- F02M26/28—Layout, e.g. schematics with 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/42—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders
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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
- F02M26/65—Constructional details of EGR valves
- F02M26/70—Flap valves; Rotary valves; Sliding valves; Resilient valves
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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
- F02M26/65—Constructional details of EGR valves
- F02M26/72—Housings
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
a controllable EGR system integrated with a cold EGR valve and a hot EGR valve comprises an engine, a gas compressor, a turbine, an integrated EGR valve, a cooler and a mixer, wherein two ends of the engine are respectively connected with an air inlet pipe and an exhaust pipe, the integrated EGR valve comprises an exhaust inlet, a hot EGR outlet and a cold EGR outlet which are communicated, the exhaust pipe is connected with the exhaust inlet and an air inlet end of the turbine, the cold EGR outlet is connected with an air inlet end of the cooler, an air outlet end of the cooler, the hot EGR outlet and an air outlet end of the gas compressor are connected with an air inlet end of the mixer, and an air outlet end of the mixer is connected with the engine through the air inlet pipe. The design not only has wider adjusting range for the EGR temperature and the EGR rate, but also has stronger regulation and control capability and higher structure simplicity.
Description
Technical Field
The invention relates to an EGR (exhaust gas recirculation) system, belongs to the technical field of engine exhaust gas recirculation, in particular to a controllable EGR system integrated with a cold EGR valve and a hot EGR valve, and is particularly suitable for improving the EGR rate and the adjustment range of EGR temperature.
Background
EGR, an exhaust gas recirculation system, is a system that introduces a portion of the exhaust gas of an engine into a cylinder to lower the in-cylinder combustion temperature and thereby reduce NOx emissions. EGR is divided into cold EGR and hot EGR, wherein the cold EGR refers to that partial exhaust gas is cooled by a cooler and then is introduced into a cylinder, the hot EGR refers to that the exhaust gas directly enters the cylinder without passing through the cooler, the temperature of the cold EGR is lower than that of the hot EGR, the lower in-cylinder combustion temperature can be realized, and the NOx emission is further reduced.
the invention discloses a controllable leading-in device for realizing cold and hot EGR, which is disclosed by the invention with the application publication number of CN105422323A and the application publication date of 2016, 3 and 23, and comprises an engine, a turbine, an EGR valve, a gas compressor, a cooler and a throttle valve, wherein the gas inlet end of the turbine is connected with the gas outlet end of an exhaust manifold in the engine through a pipeline, the gas inlet A of the EGR valve is connected with the gas outlet end of the engine through a pipeline, the gas outlet C of the EGR valve is connected with the gas inlet end of the cooler through a pipeline, the gas outlet end of the gas compressor is connected with the gas inlet end of the cooler through a pipeline, the gas outlet of the cooler is connected with one end of the throttle valve through a pipeline, the other end of the throttle valve is connected with the gas inlet end of the gas inlet manifold in the engine through a pipeline, the. Although the design has two EGR application modes of cold EGR and hot EGR, the design has the following defects:
Firstly, the design can only realize cold EGR or hot EGR, and cold EGR and hot EGR cannot be adopted at the same time, so that the adjusting range of the EGR temperature is limited;
Secondly, this design does not have a pre-vortex throttling function, and cannot adjust the EGR driving pressure difference, so that a higher EGR rate cannot be achieved.
The information disclosed in this background section is only for enhancement of understanding of the general background of the patent application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
disclosure of Invention
The invention aims to solve the problem of small EGR temperature adjusting range in the prior art, and provides a controllable EGR system which integrates a cold EGR valve and a hot EGR valve and has wider EGR temperature adjusting range.
In order to achieve the above purpose, the technical solution of the invention is as follows: a controllable EGR system integrated with a cold EGR valve and a hot EGR valve comprises an engine, a gas compressor and a turbine, wherein a plurality of cylinders are arranged in the engine, the gas outlet end of the gas compressor is connected with one end of the engine through a gas inlet pipe, and the other end of the engine is connected with the gas inlet end of the turbine through a gas outlet pipe;
The controllable EGR system further comprises an integrated EGR valve, a cooler and a mixer, the integrated EGR valve comprises an exhaust inlet, a hot EGR outlet and a cold EGR outlet which are communicated with each other, the exhaust pipe is connected with the exhaust inlet and the air inlet end of the turbine, the cold EGR outlet is connected with the air inlet end of the cooler, the air outlet end of the cooler, the hot EGR outlet and the air outlet end of the air compressor are connected with the air inlet end of the mixer, and the air outlet end of the mixer is connected with the engine through an air inlet pipe.
The integrated EGR valve comprises a valve shell and a valve inner cavity arranged in the valve shell, wherein one end of the valve shell is provided with an exhaust inlet, the other end of the valve shell is provided with a hot EGR outlet and a cold EGR outlet which are arranged up and down, and the exhaust inlet, the hot EGR outlet and the cold EGR outlet are communicated with the valve inner cavity;
The valve comprises a valve inner cavity, a valve core, a valve cover, a valve core, a valve rod;
the area of the exhaust inlet is smaller than or equal to the coverage area of the outer end of the fan-shaped valve plate, the area of an area sandwiched between the upper edge of the opening of the hot EGR outlet and the lower edge of the opening of the cold EGR outlet is smaller than or equal to the coverage area of the outer end of the fan-shaped valve plate, the area of a hot clamping area sandwiched between the hot EGR outlet and the exhaust inlet is larger than or equal to the coverage area of the outer end of the fan-shaped valve plate, and the area of a cold clamping area sandwiched between the cold EGR outlet and the exhaust inlet is larger than or equal to the coverage area of the outer end of the fan-shaped valve.
the inner end of the fan-shaped valve plate is connected with the outer edge of the round rotating block, a rotating shaft is arranged inside the round rotating block, and the round rotating block, the rotating shaft and the valve inner cavity are coaxially arranged.
The left end of the valve shell is connected with the left end of the valve, a left end cavity communicated with the exhaust inlet is formed in the left end of the valve, the right end of the valve shell is connected with the upper right end of the valve and the lower right end of the valve, an upper right end cavity communicated with the hot EGR outlet is formed in the upper right end of the valve, and a lower right end cavity communicated with the cold EGR outlet is formed in the lower right end of the valve.
The gas outlet end of the cooler is connected with the gas inlet end of the mixer through a first check valve, and the hot EGR outlet is connected with the gas inlet end of the mixer through a second check valve.
The controllable EGR system also comprises a flow regulating valve, a radiator, a temperature regulator and a water pump, under the working condition of small circulation, the cooler takes water from a water sending and taking port through the flow regulating valve, and the outlet water of the cooler and the outlet water of the water sending port flow back to a water sending and returning port after passing through the temperature regulator and the water pump; under the working condition of large circulation, the cooler takes water from the water sending and taking port through the flow regulating valve, and the outlet water of the cooler and the outlet water of the water sending port flow back to the water sending and returning port after passing through the radiator, the temperature regulator and the water pump.
The controllable EGR system further comprises a fan and an air cooler, the air compressor is communicated with the air inlet end of the mixer through the air cooler, and the temperature regulator is located between the radiator and the water pump.
the air inlet end of the air compressor is connected with an air filter, and the air outlet end of the turbine is connected with an exhaust aftertreatment device.
compared with the prior art, the invention has the beneficial effects that:
1. In the controllable EGR system integrating the cold EGR valve and the hot EGR valve, the additionally arranged integrated EGR valve comprises two outlets, namely a hot EGR outlet and a cold EGR outlet, wherein the cold EGR outlet is connected with the air inlet end of a mixer through a cooler, and the hot EGR outlet is directly connected with the air inlet end of the mixer. Therefore, the invention can adopt a mode of combining cold EGR and hot EGR to adjust, and has wider adjusting range of EGR temperature and EGR rate.
2. In the controllable EGR system of the integrated cold and hot EGR valve, the integrated EGR valve comprises a valve shell and a valve inner cavity therein, one end of the valve shell is provided with an exhaust inlet, the other end of the valve shell is provided with a hot EGR outlet and a cold EGR outlet, a fan-shaped valve plate rotating along the wall of the cavity is arranged in the valve inner cavity, and along with the rotation of the fan-shaped valve plate, the opening/closing of each air port can be controlled, and the opening proportion of each air port can be controlled, and the design has the advantages that: firstly, the exhaust inlet can be controlled in proportion to adjust the integral EGR rate and EGR temperature, and the hot EGR outlet and the cold EGR outlet can be controlled in proportion to adjust the integral EGR rate and EGR temperature respectively, so that a larger EGR rate, a wider EGR temperature adjusting range and higher adjusting accuracy are obtained; secondly, three air ports are integrated on one valve body, so that the distribution and control of exhaust are facilitated, the arrangement is more convenient and simpler, the occupied space is saved, and the installation difficulty is reduced; and thirdly, the opening/closing control of the exhaust inlet, the hot EGR outlet and the cold EGR outlet by the fan-shaped valve plate belongs to online operation, has strong adjustability and can be adjusted according to various different conditions or requirements in practical application. Therefore, the EGR system and the EGR method can improve the EGR rate and the adjusting range of the EGR temperature, enhance the accuracy of regulation and control, and have higher simplicity and smaller occupied space.
3. In the controllable EGR system integrating the cold EGR valve and the hot EGR valve, the exhaust pipe comprises two gas flow directions, one gas flow direction enters the engine for reuse after flowing through the mixer and the air inlet pipe, and the other gas flow direction passes through the turbine and is exhausted as exhaust gas. Therefore, the driving pressure difference of the EGR can be adjusted to obtain better EGR driving capability and EGR rate.
4. In the controllable EGR system integrating the cold EGR valve and the hot EGR valve, the cold EGR outlet sequentially flows to the mixer through the cooler and the one-way valve, the hot EGR outlet also flows to the mixer through the two-way valve, the air sources of the cold EGR outlet and the hot EGR outlet are from the exhaust pipe, the exhaust pipe has pulse energy, and the one-way valve can prevent gas backflow, so that the combination of the pulse energy and the one-way valve can improve the EGR driving capability and increase the EGR rate, and simultaneously, the use frequency of the vortex front throttling technology can be reduced, the pumping loss can be reduced on the basis of improving the EGR rate, and the economy of an engine can be improved. Therefore, the invention not only can improve the EGR driving capability and the EGR rate, but also can reduce the pumping loss and improve the economy of the engine.
5. the invention relates to a controllable EGR system integrating a cold EGR valve and a hot EGR valve, which is additionally provided with a flow regulating valve, a radiator, a thermostat and a water pump, and a special cooling liquid loop is constructed among an engine, the flow regulating valve, the radiator, the thermostat and the water pump on the basis of the flow regulating valve, the radiator, the thermostat and the water pump. Therefore, the accuracy of the cold EGR control is higher.
Drawings
Fig. 1 is a schematic structural view of the present invention.
fig. 2 is a schematic view of the structure of the integrated EGR valve of the present invention.
FIG. 3 is a first operational schematic of the present invention for adjusting hot and cold EGR outlets.
FIG. 4 is a second operational schematic of the present invention for adjusting hot and cold EGR outlets.
FIG. 5 is a schematic diagram of the operation of the present invention to regulate the exhaust gas inlet.
FIG. 6 is another operational schematic of the present invention for regulating the exhaust gas inlet.
In the figure: the system comprises a compressor 1, an engine 2, a cylinder 21, a water sending and returning port 22, a water sending and returning port 23, an air inlet pipe 24, an exhaust pipe 25, a water sending and taking port 26, a turbine 3, a cooler 4, a mixer 5, a first check valve 51, a second check valve 52, an integrated EGR valve 8, a valve inner cavity 80, an exhaust gas inlet 81, a hot EGR outlet 83, an upper port edge 831, a hot clamping area 832, a cold EGR outlet 84, a lower port edge 841, a cold clamping area 842, a valve housing 85, a valve left end 851, a valve left end cavity 852, a valve right upper end 854, a valve right lower end 855, a valve right upper end cavity 856, a valve right lower end cavity 857, a fan-shaped valve sheet 86, a circular rotation block 87, a rotation shaft 88, a radiator 9, a water dispersing inlet 91, a water discharging and discharging port 92, a flow regulating valve 10, a temperature regulator 11, a water pump 12, a fan 13, an air cooler 14, an air.
Detailed Description
The present invention will be described in further detail with reference to the following description and embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 to 6, a controllable EGR system integrating a cold EGR valve and a hot EGR valve comprises an engine 2, a compressor 1 and a turbine 3, wherein a plurality of cylinders 21 are arranged in the engine 2, an air outlet end of the compressor 1 is connected with one end of the engine 2 through an air inlet pipe 24, and the other end of the engine 2 is connected with an air inlet end of the turbine 3 through an air outlet pipe 25;
the controllable EGR system further comprises an integrated EGR valve 8, a cooler 4 and a mixer 5, wherein the integrated EGR valve 8 comprises an exhaust inlet 81, a hot EGR outlet 83 and a cold EGR outlet 84 which are communicated with each other, the exhaust pipe 25 is connected with the exhaust inlet 81 and the air inlet end of the turbine 3, the cold EGR outlet 84 is connected with the air inlet end of the cooler 4, the air outlet end of the cooler 4, the hot EGR outlet 83 and the air outlet end of the compressor 1 are connected with the air inlet end of the mixer 5, and the air outlet end of the mixer 5 is connected with the engine 2 through an air inlet pipe 24.
The integrated EGR valve 8 comprises a valve housing 85 and a valve inner cavity 80 arranged in the valve housing 85, one end of the valve housing 85 is provided with an exhaust inlet 81, the other end of the valve housing 85 is provided with a hot EGR outlet 83 and a cold EGR outlet 84 which are arranged up and down, and the exhaust inlet 81, the hot EGR outlet 83 and the cold EGR outlet 84 are communicated with the valve inner cavity 80;
A fan-shaped valve plate 86 with a wide outer part and a narrow inner part is arranged in the valve inner cavity 80, the outer end of the fan-shaped valve plate 86 rotates along the cavity wall of the valve inner cavity 80, the inner end of the fan-shaped valve plate 86 is arranged close to the circle center of the valve inner cavity 80, and the length of the fan-shaped valve plate 86 is smaller than the radius of the cross section of the valve inner cavity 80;
The area of the exhaust inlet 81 is smaller than or equal to the coverage area of the outer end of the fan-shaped valve plate 86, the area of the area sandwiched between the upper port edge 831 of the hot EGR outlet 83 and the lower port edge 841 of the cold EGR outlet 84 is smaller than or equal to the coverage area of the outer end of the fan-shaped valve plate 86, the area of the hot clamping area 832 formed by the hot EGR outlet 83 and the exhaust inlet 81 is larger than or equal to the coverage area of the outer end of the fan-shaped valve plate 86, and the area of the cold clamping area 842 formed by the cold EGR outlet 84 and the exhaust inlet 81 is larger than or equal to the coverage area of the outer end of the fan-shaped valve plate 86.
The inner end of the fan-shaped valve plate 86 is connected with the outer edge of the round rotating block 87, a rotating shaft 88 is arranged inside the round rotating block 87, and the round rotating block 87, the rotating shaft 88 and the valve inner cavity 80 are coaxially arranged.
The left end of the valve housing 85 is connected with the valve left end portion 851, the valve left end portion 851 is internally provided with a valve left end cavity 852 communicated with the exhaust gas inlet 81, the right end of the valve housing 85 is connected with a valve right upper end portion 854 and a valve right lower end portion 855, the valve right upper end portion 854 is internally provided with a valve right upper end cavity 856 communicated with the hot EGR outlet 83, and the valve right lower end portion 855 is internally provided with a valve right lower end cavity 857 communicated with the cold EGR outlet 84.
the air outlet end of the cooler 4 is connected with the air inlet end of the mixer 5 through a first check valve 51, and the hot EGR outlet 83 is connected with the air inlet end of the mixer 5 through a second check valve 52.
The controllable EGR system also comprises a flow regulating valve 10, a radiator 9, a temperature regulator 11 and a water pump 12, under the working condition of small circulation, the cooler 4 takes water from a water sending and taking port 26 through the flow regulating valve 10, and the outlet water of the cooler 4 and the outlet water of the water sending port 23 flow back to a water sending and returning port 22 after passing through the temperature regulator 11 and the water pump 12; under the large circulation working condition, the cooler 4 takes water from the water sending and taking port 26 through the flow regulating valve 10, and the outlet water of the cooler 4 and the outlet water of the water sending and taking port 23 flow back to the water sending and returning port 22 after passing through the radiator 9, the temperature regulator 11 and the water pump 12.
The controllable EGR system further comprises a fan 13 and an air cooler 14, the compressor 1 is communicated with the air inlet end of the mixer 5 through the air cooler 14, and the temperature regulator 11 is located between the radiator 9 and the water pump 12.
The air inlet end of the compressor 1 is connected with an air filter 15, and the air outlet end of the turbine 3 is connected with an exhaust gas post-treatment device 16.
The principle of the invention is illustrated as follows:
The invention aims to provide a controllable EGR system integrating a cold EGR valve and a hot EGR valve so as to meet the requirement of different working conditions on adjustable EGR temperature, and the controllable EGR system is characterized in that when the post-treatment working temperature is lower, hot EGR can be adopted, so that the working temperatures of an engine and post-treatment are quickly increased, the post-treatment conversion efficiency is improved, and the emission performance is improved; when the post-treatment working temperature is higher, cold EGR and hot EGR can be adjusted, so that the accurate adjustment of the EGR temperature and the EGR rate is realized, and the purpose of optimally controlling the performance and the emission of the engine is achieved.
through an integrated EGR valve, the control of the engine on cold EGR and hot EGR is realized, the structure of the engine EGR system is simplified, and the requirements of different working conditions of the engine on the cold EGR and the hot EGR are realized. When the engine works only by single cold EGR and hot EGR, different EGR rates can be controlled by adjusting the fan-shaped valve plates; when the engine simultaneously requires cold EGR and hot EGR, the cold EGR and the hot EGR are fully opened or one is fully opened to carry out proportion adjustment on the other. The following is a description of a specific working process, and the angle of the fan-shaped valve plate 86 in the initial state is set to 0 °, and the opening degrees of the cold EGR outlet 84 and the hot EGR outlet 83 are both 0.
Referring to FIG. 3, the present design provides for a first operation of adjusting hot EGR outlet 83, cold EGR outlet 84:
The sector valve plate 86 rotates counterclockwise by 0-36 degrees, the opening degree of the cold EGR outlet 84 is 0-100%, and the opening degree of the hot EGR outlet 83 is 0; the sector valve plate 86 is 70-106 degrees anticlockwise, the opening degree of the cold EGR outlet 84 is 100%, and the opening degree of the hot EGR outlet 83 is 0-100%; the sector valve plate 86 rotates anticlockwise to 106 degrees, and the opening degrees of the cold EGR outlet 84 and the hot EGR outlet 83 are both 100 percent.
Referring to FIG. 4, the present design provides a second operation for adjusting hot EGR outlet 83 and cold EGR outlet 84:
the sector valve plate 86 is clockwise 0-36 degrees, the opening degree of the hot EGR outlet 83 is 0-100%, and the opening degree of the cold EGR outlet 84 is 0; the fan-shaped valve plate 86 is 70-106 degrees clockwise, the opening degree of the hot EGR outlet 83 is 100 percent, and the opening degree of the cold EGR outlet 84 is 0-100 percent; when the fan-shaped valve plate 86 is rotated to 106 degrees clockwise, the openings of the cold EGR outlet 84 and the hot EGR outlet 83 are both 100 percent.
referring to fig. 5 and 6, the design performs two operations on the exhaust inlet 81 as follows:
The fan-shaped valve plate 86 is 106-146 degrees clockwise or 106-146 degrees anticlockwise, the cold EGR outlet 84 and the hot EGR outlet 83 achieve fixed proportion, and the EGR opening degree (namely the opening degree of the exhaust inlet 81) can achieve 0-100%.
Example 1:
referring to fig. 1 to 6, a controllable EGR system integrating a cold EGR valve and a hot EGR valve comprises a compressor 1, an engine 2, a turbine 3, a cooler 4, a mixer 5 and an integrated EGR valve 8, wherein a plurality of cylinders 21 are arranged inside the engine 2, an air outlet end of the compressor 1 is connected with one end of the engine 2 through an air inlet pipe 24, and the other end of the engine 2 is connected with an air inlet end of the turbine 3 through an air outlet pipe 25; the integrated EGR valve 8 comprises an exhaust inlet 81, a hot EGR outlet 83 and a cold EGR outlet 84 which are communicated with each other, the exhaust pipe 25 is connected with the exhaust inlet 81 and the air inlet end of the turbine 3, the cold EGR outlet 84 is connected with the air inlet end of the cooler 4, the air outlet end of the cooler 4, the hot EGR outlet 83 and the air outlet end of the compressor 1 are connected with the air inlet end of the mixer 5, and the air outlet end of the mixer 5 is connected with the engine 2 through the air inlet pipe 24.
Example 2:
The basic contents are the same as example 1, except that:
The integrated EGR valve 8 comprises a valve housing 85 and a valve inner cavity 80 arranged in the valve housing 85, one end of the valve housing 85 is provided with an exhaust inlet 81, the other end of the valve housing 85 is provided with a hot EGR outlet 83 and a cold EGR outlet 84 which are arranged up and down, and the exhaust inlet 81, the hot EGR outlet 83 and the cold EGR outlet 84 are communicated with the valve inner cavity 80; a fan-shaped valve plate 86 with a wide outer part and a narrow inner part is arranged in the valve inner cavity 80, the outer end of the fan-shaped valve plate 86 rotates along the cavity wall of the valve inner cavity 80, the inner end of the fan-shaped valve plate 86 is arranged close to the circle center of the valve inner cavity 80, and the length of the fan-shaped valve plate 86 is smaller than the radius of the cross section of the valve inner cavity 80; the area of the exhaust inlet 81 is smaller than or equal to the coverage area of the outer end of the fan-shaped valve plate 86, the area of the area sandwiched between the upper port edge 831 of the hot EGR outlet 83 and the lower port edge 841 of the cold EGR outlet 84 is smaller than or equal to the coverage area of the outer end of the fan-shaped valve plate 86, the area of the hot clamping area 832 formed by the hot EGR outlet 83 and the exhaust inlet 81 is larger than or equal to the coverage area of the outer end of the fan-shaped valve plate 86, and the area of the cold clamping area 842 formed by the cold EGR outlet 84 and the exhaust inlet 81 is larger than or equal to the coverage area of the outer end of the fan-shaped valve plate 86. Preferably, the inner end of the fan-shaped valve plate 86 is connected with the outer edge of the circular rotating block 87, the rotating shaft 88 is arranged inside the circular rotating block 87, and the circular rotating block 87, the rotating shaft 88 and the valve inner cavity 80 are coaxially arranged.
example 3:
the basic contents are the same as example 1, except that:
The air outlet end of the cooler 4 is connected with the air inlet end of the mixer 5 through a first check valve 51, and the hot EGR outlet 83 is connected with the air inlet end of the mixer 5 through a second check valve 52.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but equivalent modifications or changes made by those skilled in the art according to the present disclosure should be included in the scope of the present invention as set forth in the appended claims.
Claims (8)
1. The utility model provides an integrated cold, controllable EGR system of hot EGR valve, includes engine (2), compressor (1) and turbine (3), the inside of engine (2) is provided with a plurality of cylinders (21), and the end of giving vent to anger of compressor (1) is connected with the one end of engine (2) through intake pipe (24), and the other end of engine (2) is connected with the inlet end of turbine (3) through blast pipe (25), its characterized in that:
The controllable EGR system further comprises an integrated EGR valve (8), a cooler (4) and a mixer (5), the integrated EGR valve (8) comprises an exhaust inlet (81), a hot EGR outlet (83) and a cold EGR outlet (84), the exhaust pipe (25) is connected with the exhaust inlet (81) and the air inlet of the turbine (3), the cold EGR outlet (84) is connected with the air inlet of the cooler (4), the air outlet of the cooler (4), the hot EGR outlet (83) and the air outlet of the compressor (1) are connected with the air inlet of the mixer (5), and the air outlet of the mixer (5) is connected with the engine (2) through an air inlet pipe (24).
2. A controllable EGR system incorporating a cold and hot EGR valve according to claim 1 wherein: the integrated EGR valve (8) comprises a valve shell (85) and a valve inner cavity (80) arranged in the valve shell, one end of the valve shell (85) is provided with an exhaust inlet (81), the other end of the valve shell (85) is provided with a hot EGR outlet (83) and a cold EGR outlet (84) which are arranged up and down, and the exhaust inlet (81), the hot EGR outlet (83) and the cold EGR outlet (84) are communicated with the valve inner cavity (80);
A fan-shaped valve plate (86) with a wide outer part and a narrow inner part is arranged inside the valve inner cavity (80), the outer end of the fan-shaped valve plate (86) rotates along the cavity wall of the valve inner cavity (80), the inner end of the fan-shaped valve plate (86) is arranged close to the circle center of the valve inner cavity (80), and the length of the fan-shaped valve plate (86) is smaller than the radius of the cross section of the valve inner cavity (80);
the area of the exhaust inlet (81) is smaller than or equal to the coverage area of the outer end of the fan-shaped valve plate (86), the area of a region sandwiched between an upper port edge (831) of the hot EGR outlet (83) and a lower port edge (841) of the cold EGR outlet (84) is smaller than or equal to the coverage area of the outer end of the fan-shaped valve plate (86), the area of a hot clamping area (832) sandwiched between the hot EGR outlet (83) and the exhaust inlet (81) is larger than or equal to the coverage area of the outer end of the fan-shaped valve plate (86), and the area of a cold clamping area (842) sandwiched between the cold EGR outlet (84) and the exhaust inlet (81) is larger than or equal to the coverage area of the outer end of the fan-shaped valve plate (86).
3. A controllable EGR system incorporating a cold and hot EGR valve according to claim 2 wherein: the inner end of the fan-shaped valve plate (86) is connected with the outer edge of the round rotating block (87), a rotating shaft (88) is arranged inside the round rotating block (87), and the round rotating block (87), the rotating shaft (88) and the valve inner cavity (80) are coaxially arranged.
4. A controllable EGR system incorporating a cold and hot EGR valve according to claim 2 wherein: the left end of valve case (85) is connected with valve left end portion (851), and the inside of valve left end portion (851) is seted up and is had the communicating valve left end chamber (852) of exhaust inlet (81), the right-hand member of valve case (85) is connected with valve right upper end portion (854), valve right lower extreme (855), has seted up in valve right upper end portion (854) and has linked together with communicating valve right upper end chamber (856) of hot EGR export (83), has seted up in valve right lower extreme (855) and has linked together with cold EGR export (84) communicating valve right lower extreme chamber (857).
5. A controllable EGR system integrating cold and hot EGR valves according to any of claims 1-4, characterized in that: the air outlet end of the cooler (4) is connected with the air inlet end of the mixer (5) through a first check valve (51), and the hot EGR outlet (83) is connected with the air inlet end of the mixer (5) through a second check valve (52).
6. A controllable EGR system integrating cold and hot EGR valves according to any of claims 1-4, characterized in that: the controllable EGR system further comprises a flow regulating valve (10), a radiator (9), a temperature regulator (11) and a water pump (12), under the working condition of small circulation, the cooler (4) takes water from a water sending and taking port (26) through the flow regulating valve (10), and water outlet of the cooler (4) and water outlet of a water sending port (23) flow back to a water sending and returning port (22) after passing through the temperature regulator (11) and the water pump (12); under the working condition of large circulation, the cooler (4) takes water from the water sending and taking port (26) through the flow regulating valve (10), and the outlet water of the cooler (4) and the outlet water of the water sending port (23) flow back to the water sending and returning port (22) after passing through the radiator (9), the temperature regulator (11) and the water pump (12).
7. a controllable EGR system integrating cold and hot EGR valves according to claim 6, wherein: the controllable EGR system further comprises a fan (13) and an air cooler (14), the air compressor (1) is communicated with the air inlet end of the mixer (5) through the air cooler (14), and the temperature regulator (11) is located between the radiator (9) and the water pump (12).
8. a controllable EGR system integrating cold and hot EGR valves according to any of claims 1-4, characterized in that: the air inlet end of the air compressor (1) is connected with an air filter (15), and the air outlet end of the turbine (3) is connected with an exhaust aftertreatment device (16).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910690011.XA CN110566380A (en) | 2019-07-29 | 2019-07-29 | Controllable EGR system of integrated cold, hot EGR valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910690011.XA CN110566380A (en) | 2019-07-29 | 2019-07-29 | Controllable EGR system of integrated cold, hot EGR valve |
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| CN204082391U (en) * | 2014-09-30 | 2015-01-07 | 四川田奥环保科技有限公司 | A kind of electric control EGR valve |
| CN108252829A (en) * | 2018-04-04 | 2018-07-06 | 吉林大学 | A kind of binary channels EGR regulating devices and its control method |
| US20190072057A1 (en) * | 2017-09-05 | 2019-03-07 | Hyundai Motor Company | Exhaust gas recirculation valve for vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102010006038A1 (en) * | 2010-01-27 | 2011-07-28 | Pierburg GmbH, 41460 | Device for regulating a fluid flow |
| CN103775252A (en) * | 2014-01-22 | 2014-05-07 | 东风商用车有限公司 | Supercharged diesel engine EGR (Exhaust Gas Recirculation) system intelligent cooling device |
| CN204082391U (en) * | 2014-09-30 | 2015-01-07 | 四川田奥环保科技有限公司 | A kind of electric control EGR valve |
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Application publication date: 20191213 |