CN110566379A - EGR cooler capable of observing boiling of cooling liquid and control method thereof - Google Patents
EGR cooler capable of observing boiling of cooling liquid and control method thereof Download PDFInfo
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- CN110566379A CN110566379A CN201910952282.8A CN201910952282A CN110566379A CN 110566379 A CN110566379 A CN 110566379A CN 201910952282 A CN201910952282 A CN 201910952282A CN 110566379 A CN110566379 A CN 110566379A
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- 238000009835 boiling Methods 0.000 title claims abstract description 43
- 239000000110 cooling liquid Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 169
- 230000001105 regulatory effect Effects 0.000 claims abstract description 47
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 4
- 239000002826 coolant Substances 0.000 claims description 14
- 238000012360 testing method Methods 0.000 claims description 11
- 230000001276 controlling effect Effects 0.000 claims description 9
- 238000012937 correction Methods 0.000 claims description 6
- 238000013139 quantization Methods 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000004519 grease Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 12
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 238000002485 combustion reaction Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000012780 transparent material Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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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
- F02M26/29—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
Landscapes
- 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
The invention discloses an EGR cooler capable of observing boiling of cooling liquid, which comprises: a support frame, one side of which is provided with an observation window for observing the boiling condition of the cooling liquid in the EGR cooler; the shell is detachably and fixedly arranged in the support frame and is provided with a cooling liquid accommodating channel; the shell is made of transparent high-temperature-resistant materials, so that the cooling liquid accommodating channel is in a visible state; the liquid inlet is communicated with one side of the cooling liquid accommodating channel; the liquid inlet regulating valve is arranged at the liquid inlet; a liquid outlet which is communicated with the other side of the cooling accommodating channel; a plurality of air guide passages spaced in parallel through the housing; and the cooling radiating fins are respectively and correspondingly arranged in the air guide channels. The invention also discloses a control method of the EGR cooler capable of observing the boiling of the cooling liquid.
Description
Technical Field
the invention relates to an engine cooling system, in particular to an EGR cooler capable of observing boiling of cooling liquid and a control method thereof.
Background
An Exhaust Gas Recirculation (EGR) system is used to reduce the amount of Nitrogen Oxide (NOX) emitted from exhaust gas. Nitrogen and oxygen react chemically only at high temperatures and pressures, which are met by the temperature and pressure in the engine combustion chamber, especially during forced acceleration. When the engine is running under load, the EGR valve is opened, allowing a small amount of exhaust gas to enter the intake manifold, along with the combustible mixture, and into the combustion chamber. At idle the EGR valve is closed and little exhaust gas is recirculated to the engine. Automobile exhaust is a non-combustible gas (free of fuel and oxidant) that does not participate in combustion in the combustion chamber. It reduces the combustion temperature and pressure by absorbing part of the heat generated by combustion to reduce the amount of nitrogen oxides produced. The amount of exhaust gas entering the combustion chamber increases with increasing engine speed and load. The EGR valve is normally open under the following conditions: 1. the engine is warmed up. 2. The rotational speed exceeds the idle speed. The ECM controls the EGR system based on an engine cooling water temperature sensor, a throttle position sensor, and an air flow sensor.
disclosure of Invention
the invention designs and develops an EGR cooler capable of observing the boiling of cooling liquid, and aims to solve the problem that the cooling liquid can be observed in the test process by preparing a cooler shell made of transparent materials and arranging an observation window.
The invention designs and develops a control method of an EGR cooler capable of observing the boiling of cooling liquid, and aims to control a liquid inlet regulating valve according to the air inlet temperature of an air guide channel, the air outlet temperature of the air guide channel, the liquid inlet temperature, the liquid outlet temperature and the boiling liquid ratio condition so as to effectively avoid the boiling of the liquid.
The technical scheme provided by the invention is as follows:
an EGR cooler with observable coolant boiling, comprising:
a support frame, one side of which is provided with an observation window for observing the boiling condition of the cooling liquid in the EGR cooler;
the shell is detachably and fixedly arranged in the support frame and is provided with a cooling liquid accommodating channel;
The shell is made of transparent high-temperature-resistant materials, so that the cooling liquid accommodating channel is in a visible state;
The liquid inlet is communicated with one side of the cooling liquid accommodating channel;
The liquid inlet regulating valve is arranged at the liquid inlet;
A liquid outlet which is communicated with the other side of the cooling accommodating channel;
A plurality of air guide passages spaced in parallel through the housing;
and the cooling radiating fins are respectively and correspondingly arranged in the air guide channels.
Preferably, the method further comprises the following steps: the air inlet connecting flange is detachably connected with the air inlet of the air guide channel;
the air outlet connecting flange is detachably connected with an air outlet of the air guide channel;
The liquid inlet connecting flange is detachably connected with the liquid inlet; and
And the liquid outlet connecting flange is detachably connected with the liquid outlet.
Preferably, the method further comprises the following steps: an intake valve disposed at the intake connection flange.
Preferably, the method further comprises the following steps: and the temperature sensors are respectively arranged at the liquid inlet, the liquid outlet, the air inlet of the air guide channel and the air outlet of the air guide channel.
preferably, the housing is a quartz glass plate and is sealed by a high temperature resistant sealing grease.
a control method of an EGR cooler in which boiling of coolant is observable, using the EGR cooler in which boiling of coolant is observable according to claims 1-5, comprising the steps of:
step one, collecting the air inlet temperature T of an air guide channel after the EGR cooler starts to workGIAir outlet temperature T of air guide channelGOtemperature T of the liquid inletLItemperature T of liquid outletLOand the intake flow rate Q of the air guide passageG；
Step two, observing the liquid inlet through the observation window, determining a test area from the liquid inlet of the cooling liquid accommodating channel, and determining the volume ratio Z of the liquid boiling condition in the area1、Z2、Z3；
Wherein Z is1volume fraction for generating small bubbles of liquid in said zone, Z2volume fraction for generating large bubbles of liquid in said zone, Z3Generating a volume fraction of continuous large bubbles for the liquid in said region;
Step three, when observing from the observation window that the inlet begins to generate the small bubble, and when the temperature of the inlet reaches the critical temperature of the small bubble, the inlet regulating valve begins to be controlled, and the control opening delta of the inlet regulating valve at the moment is:
When observing the big bubble that begins to produce at the inlet from the observation window, the control aperture to the inlet regulator valve is:
when continuous large bubbles are generated at the liquid inlet from the observation window, the liquid inlet regulating valve is controlled by adopting fuzzy control;
In the formula, λ1Is a first correction coefficient with a value range of 0.86-0.91 and lambda2The value range of the second correction coefficient is 0.81-0.87;
And step four, observing the liquid inlet through an observation window until the liquid stops boiling in the region and then stops controlling the liquid inlet regulating valve, and adjusting the liquid inlet regulating valve to the minimum opening degree.
Preferably, in the third step, the controlling the liquid inlet regulating valve by using fuzzy control comprises the following processes:
respectively converting the volume ratio of the continuous large bubbles generated by the liquid in the region, the relative change rate of the volume ratio of the continuous large bubbles generated by the liquid in the region and the opening of the liquid inlet regulating valve into a quantization grade in a fuzzy domain;
inputting the volume ratio of the continuous large bubbles generated by the liquid in the region and the relative change rate of the volume ratio of the continuous large bubbles generated by the liquid in the region into a fuzzy control model, and equally dividing into 5 grades;
The output of the fuzzy control model is the opening degree of the liquid inlet regulating valve, and the opening degree is divided into 5 grades;
Controlling the cooling liquid according to the opening degree of the liquid inlet regulating valve;
The argument of the volume ratio of the continuous large bubbles generated by the liquid in the region is [0, 1], the argument of the relative change rate of the volume ratio of the continuous large bubbles generated by the liquid in the region is [0, 1], the argument of the opening degree of the liquid inlet regulating valve is [0.3, 0.8], and the quantization factors are all set to be 1.
Preferably, the fuzzy set of the volume ratio of the continuous large bubbles generated by the liquid in the region is { ZO, PS, PM, PB, PVB }, the fuzzy set of the relative change rate of the volume ratio of the continuous large bubbles generated by the liquid in the region is { N, NM, M, ML, L }, and the fuzzy set of the opening degree of the liquid inlet regulating valve is { S, SM, M, MB, B }; the membership functions are all trigonometric functions.
Preferably, the control rule of the fuzzy control model is as follows:
volume fraction Z of liquid in zone generating continuous large bubbles3Is extremely large, and the liquid in the area generates the relative change rate Delta Z of the volume ratio of continuous large bubbles3When the opening degree delta is larger, the opening degree delta of the liquid inlet regulating valve is larger; and
When liquid is generated in the areaVolume fraction Z of continuous large bubbles3is small or zero, and the relative rate of change of the volume fraction Δ Z of the liquid in the zone to form continuous large bubbles3if the opening is small, the opening delta of the liquid inlet regulating valve is small.
preferably, the temperature at the liquid inlet reaches the critical temperature T for small bubbles to appearLI_0Is 120 ℃; and
λ1A value of 0.88, λ2the value is 0.83.
Compared with the prior art, the invention has the following beneficial effects:
1. According to the invention, the cooler shell is made of transparent materials, the observation window is arranged, so that the boiling condition of the cooling liquid in the test process can be observed at any time, and the opening of the liquid inlet regulating valve can be controlled according to the boiling condition of the cooling liquid, so that the boiling of the cooling liquid is avoided;
2. The liquid inlet regulating valve can be controlled according to the air inlet temperature of the air guide channel, the air outlet temperature of the air guide channel, the liquid inlet temperature, the liquid outlet temperature and the boiling liquid proportion condition, and liquid boiling is effectively avoided.
Drawings
Fig. 1 is a schematic view of an EGR cooler according to the present invention.
Fig. 2 is a schematic diagram of an EGR cooler according to the present invention.
Fig. 3 is a plan view of the EGR cooler structure according to the present invention.
Fig. 4 is a schematic view of a connection structure of a housing of an EGR cooler of the present invention with an air inlet connection flange, an air outlet connection flange, a liquid inlet connection flange, and a liquid outlet connection flange.
Fig. 5 is a schematic view of a connection structure of a housing of an EGR cooler of the present invention with an air inlet connection flange, an air outlet connection flange, a liquid inlet connection flange, and a liquid outlet connection flange.
Fig. 6 is a schematic view of a connection structure of the housing of the EGR cooler of the present invention with the inlet connection flange and the outlet connection flange.
Fig. 7 is a top view of a connection structure of a housing of an EGR cooler according to the present invention with an inlet connection flange and an outlet connection flange.
Fig. 8 is a schematic view of the housing structure of the EGR cooler according to the present invention.
Fig. 9 is a schematic view of the housing structure of the EGR cooler according to the present invention.
Fig. 10 is a schematic view of the housing structure of the EGR cooler according to the present invention.
FIG. 11 is a graph showing a comparison of the bulk temperature of the liquid side of a selected small bubble of liquid in a defined area in accordance with the present invention.
FIG. 12 is a graph showing a comparison of the bulk temperature of the liquid side of a selected large bubble of liquid in a defined area in accordance with the present invention.
FIG. 13 is a graph showing the comparison of the overall temperature of the liquid side of a selected liquid in a certain area to generate continuous large bubbles according to the present invention.
FIG. 14 is a comparison of the total area of the liquid side of the present invention selected to generate small bubbles in a certain area of liquid.
FIG. 15 is a comparison of the overall area of the liquid side of the present invention selected to generate large bubbles of liquid in a certain area.
FIG. 16 is a comparison of the whole area of the liquid side of the liquid generating continuous large bubbles in a certain area according to the present invention.
FIG. 17 is a membership function of the volume fraction of continuous large bubbles generated by a liquid in a zone according to the present invention.
FIG. 18 is a membership function of the relative rate of change of the volume fraction of continuous large bubbles generated by a liquid in a zone according to the invention.
fig. 19 is a membership function of the opening degree of the feed regulating valve according to the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
as shown in fig. 1 to 10, the present invention provides an EGR cooler capable of observing coolant boiling, the main structure of which includes a support frame 100 and a cooler main body 200; the cooler main body 200 includes: a housing 210, an inlet 221, an outlet 222, a plurality of gas guide channels 230, and a plurality of cooling fins 240; an observation window 110 is arranged on one side of the support frame 100 and is used for observing the boiling condition of the cooling liquid in the EGR cooler, a shell 210 is detachably and fixedly arranged in the support frame 100, and the shell 210 is provided with a cooling liquid accommodating channel; the housing 210 is made of transparent high-temperature-resistant material, so that the cooling liquid accommodating channel is in a visible state; the liquid inlet 221 is communicated with one side of the cooling liquid accommodating channel, and the liquid outlet 222 is communicated with the other side of the cooling liquid accommodating channel; a plurality of air guide channels 230 are spaced in parallel through the casing 210, and a plurality of cooling fins 240 are respectively and correspondingly disposed in the air guide channels 230.
In another embodiment, the method further comprises: an air inlet connection flange 231 detachably connected to an air inlet of the air guide passage 230;
An air outlet connecting flange 232 detachably connected to the air outlet of the air guide passage 230;
the liquid inlet connecting flange 221a is detachably connected with the liquid inlet 221;
The liquid outlet connecting flange 222a is detachably connected to the liquid outlet 222.
in another embodiment, the method further comprises: and a liquid inlet regulating valve disposed at the liquid inlet 221.
In another embodiment, the method further comprises: an intake valve provided at the intake connection flange 231.
in another embodiment, the method further comprises: and a plurality of temperature sensors respectively disposed at the liquid inlet 221, the liquid outlet 222, the gas inlet of the gas guide channel 230, and the gas outlet of the gas guide channel 230.
In another embodiment, the casing 210 is a quartz glass sheet, and is sealed by high temperature resistant sealing grease, and the boiling condition of the cooling liquid can be observed at any time in the test process through the arrangement of the quartz glass sheet, and the opening of the liquid inlet regulating valve can be controlled according to the boiling condition of the cooling liquid, so that the boiling of the cooling liquid is avoided.
The invention also provides a control method of the EGR cooler capable of observing the boiling of the cooling liquid, which comprises the following steps:
the method comprises the following steps of firstly, confirming that the air tightness of a test piece of the EGR cooler is good, connecting a test tool, and fixing a gas circuit tool and the test piece; then, connecting a waterway tool, carrying out air tightness detection on the whole test pipeline again, adjusting equipment parameters according to given test conditions, and immediately carrying out a test;
Step two, collecting the air inlet temperature T of the air guide channel after the EGR cooler starts to workGIAir outlet temperature T of air guide channelGOTemperature T of the liquid inletLITemperature T of liquid outletLOAnd the intake flow rate Q of the air guide passageG；
Observing the liquid inlet through an observation window, and selecting the volume ratio Z of the liquid boiling condition in a certain area in the area from the liquid inlet of the cooling liquid accommodating channel1、Z2、Z3；
Wherein Z is1Volume fraction for generating small bubbles of liquid in said zone, Z2volume fraction for generating large bubbles of liquid in said zone, Z3Generating a volume fraction of continuous large bubbles for the liquid in said region;
Step four, when observing from the observation window that the inlet begins to generate the small bubbles, and when the temperature of the inlet reaches the critical temperature of the small bubbles, the inlet regulating valve begins to be controlled, and the control opening delta of the inlet regulating valve at the moment is:
when observing the big bubble that begins to produce at the inlet from the observation window, the control aperture to the inlet regulator valve is:
When continuous large bubbles are generated at the liquid inlet from the observation window, the liquid inlet regulating valve is controlled by adopting fuzzy control;
In the formula, λ1Is a first correction coefficient with a value range of 0.86-0.91 and lambda2The value range of the second correction coefficient is 0.81-0.87; as a preference, in the present embodiment,Preferably, the temperature at the inlet reaches the critical temperature T for the occurrence of small bubblesLI_0At 120 ℃ and lambda1A value of 0.88, λ2the value is 0.83.
And step five, observing the liquid inlet through the observation window until the liquid stops boiling in a certain area, and then stopping controlling the liquid inlet regulating valve, and adjusting the liquid inlet regulating valve to the minimum opening.
in another embodiment, as shown in FIGS. 11-16, in step three, the volume fraction Z of the boiling condition of the liquid in a certain area is determined by CFD simulation analysis1、Z2、Z3。
in another embodiment, in the fourth step, the controlling the liquid inlet regulating valve by using fuzzy control comprises the following processes:
volume ratio Z of liquid in the area to generate continuous large bubbles3The volume ratio relative change rate Delta Z of the liquid in the area to generate continuous large bubbles3Converting the opening delta of the liquid inlet regulating valve into a quantization grade in a fuzzy domain; volume ratio Z for generating continuous large bubbles from liquid in area3And the relative rate of change Δ Z of the volume fraction of the liquid in the zone to form large continuous bubbles3And inputting a fuzzy control model, wherein the output of the fuzzy control model is a liquid inlet regulating valve opening delta, and controlling the cooling liquid according to the liquid inlet regulating valve opening delta.
volume fraction Z of liquid in zone generating continuous large bubbles3Has a variation range of [0, 1]]The relative rate of change of volume fraction Δ Z of the liquid in the zone to form large continuous bubbles3has a variation range of [0, 1]]The quantitative factors are all set to 1, so that the volume ratio Z of the liquid in the region to generate the continuous large bubbles3And the relative rate of change Δ Z of the volume fraction of the liquid in the zone to form large continuous bubbles3Respectively of [0, 1]]And [0, 1]]The argument range of the opening delta of the liquid inlet regulating valve is [0.3, 0.8]](ii) a In order to ensure the control precision and ensure that the liquid can be well controlled under different environments, the volume of the liquid in the area which generates continuous large bubbles finally occupiesratio Z3the variation range of (2) is divided into 5 levels, the fuzzy set is { ZO, PS, PM, PB, PVB }, ZO represents zero, PS represents small, PM represents medium, PB represents large, and PVB represents maximum; relative rate of change of volume to volume ratio Δ Z for forming large continuous bubbles in liquid in zone3the variation range of the fuzzy set is divided into 5 levels, the fuzzy set is { N, NM, M, ML, L }, N represents small, NM represents small, M represents medium, ML represents large, and L represents large; the opening delta of the output liquid inlet regulating valve is divided into 5 grades, a fuzzy set is { S, SM, M, MB, B }, S represents small, SM represents small, M represents medium, MB represents large, and B represents large; the membership functions are all triangular membership functions, as shown in fig. 17, 18 and 19.
The control rule selection experience of the fuzzy control model is as follows:
volume fraction Z of continuous large bubbles if liquid in the zone is generated3For maximum, the relative rate of change of volume fraction Δ Z of the liquid in the zone to form continuous large bubbles3if the opening degree delta is larger, the opening degree delta of the liquid inlet regulating valve is larger;
Volume fraction Z of continuous large bubbles if liquid in the zone is generated3Small or zero, volume-to-volume ratio of relative change Δ Z of the liquid in the zone to form continuous large bubbles3If the opening is small, the opening delta of the liquid inlet regulating valve is small.
specific fuzzy control rules are shown in table 1.
TABLE 1 fuzzy control rules
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (10)
1. An EGR cooler in which boiling of coolant is observed, comprising:
A support frame, one side of which is provided with an observation window for observing the boiling condition of the cooling liquid in the EGR cooler;
the shell is detachably and fixedly arranged in the support frame and is provided with a cooling liquid accommodating channel;
the shell is made of transparent high-temperature-resistant materials, so that the cooling liquid accommodating channel is in a visible state;
the liquid inlet is communicated with one side of the cooling liquid accommodating channel;
The liquid inlet regulating valve is arranged at the liquid inlet;
A liquid outlet which is communicated with the other side of the cooling accommodating channel;
a plurality of air guide passages spaced in parallel through the housing;
And the cooling radiating fins are respectively and correspondingly arranged in the air guide channels.
2. An EGR cooler with observable boiling of coolant as recited in claim 1, further comprising: the air inlet connecting flange is detachably connected with the air inlet of the air guide channel;
The air outlet connecting flange is detachably connected with an air outlet of the air guide channel;
The liquid inlet connecting flange is detachably connected with the liquid inlet; and
And the liquid outlet connecting flange is detachably connected with the liquid outlet.
3. an EGR cooler with observable boiling of coolant as recited in claim 1 or 2, further comprising: an intake valve disposed at the intake connection flange.
4. An EGR cooler with observable boiling of coolant as recited in claim 3, further comprising: and the temperature sensors are respectively arranged at the liquid inlet, the liquid outlet, the air inlet of the air guide channel and the air outlet of the air guide channel.
5. an EGR cooler with observable boiling of coolant as recited in claim 4 wherein said housing is a quartz glass sheet and is sealed with a high temperature resistant sealing grease.
6. A control method of an EGR cooler in which boiling of coolant is observed, characterized by using the EGR cooler in which boiling of coolant is observed according to any one of claims 1 to 5, comprising the steps of:
Step one, collecting the air inlet temperature T of an air guide channel after the EGR cooler starts to workGIAir outlet temperature T of air guide channelGOtemperature T of the liquid inletLITemperature T of liquid outletLOand the intake flow rate Q of the air guide passageG；
step two, observing the liquid inlet through the observation window, determining a test area from the liquid inlet of the cooling liquid accommodating channel, and determining the volume ratio Z of the liquid boiling condition in the area1、Z2、Z3；
Wherein Z is1Volume fraction for generating small bubbles of liquid in said zone, Z2Volume fraction for generating large bubbles of liquid in said zone, Z3Generating a volume fraction of continuous large bubbles for the liquid in said region;
Step three, when observing from the observation window that the inlet begins to generate the small bubble, and when the temperature of the inlet reaches the critical temperature of the small bubble, the inlet regulating valve begins to be controlled, and the control opening delta of the inlet regulating valve at the moment is:
when observing the big bubble that begins to produce at the inlet from the observation window, the control aperture to the inlet regulator valve is:
when continuous large bubbles are generated at the liquid inlet from the observation window, the liquid inlet regulating valve is controlled by adopting fuzzy control;
in the formula, λ1is a first correction coefficient with a value range of 0.86-0.91 and lambda2The value range of the second correction coefficient is 0.81-0.87;
And step four, observing the liquid inlet through an observation window until the liquid stops boiling in the region and then stops controlling the liquid inlet regulating valve, and adjusting the liquid inlet regulating valve to the minimum opening degree.
7. The control method of an EGR cooler with observable coolant boiling of claim 6, wherein in the third step, the controlling of the intake adjusting valve by fuzzy control comprises the following processes:
respectively converting the volume ratio of the continuous large bubbles generated by the liquid in the region, the relative change rate of the volume ratio of the continuous large bubbles generated by the liquid in the region and the opening of the liquid inlet regulating valve into a quantization grade in a fuzzy domain;
inputting the volume ratio of the continuous large bubbles generated by the liquid in the region and the relative change rate of the volume ratio of the continuous large bubbles generated by the liquid in the region into a fuzzy control model, and equally dividing into 5 grades;
The output of the fuzzy control model is the opening degree of the liquid inlet regulating valve, and the opening degree is divided into 5 grades;
Controlling the cooling liquid according to the opening degree of the liquid inlet regulating valve;
The argument of the volume ratio of the continuous large bubbles generated by the liquid in the region is [0, 1], the argument of the relative change rate of the volume ratio of the continuous large bubbles generated by the liquid in the region is [0, 1], the argument of the opening degree of the liquid inlet regulating valve is [0.3, 0.8], and the quantization factors are all set to be 1.
8. The control method for an EGR cooler with observable coolant boiling of claim 7, wherein the fuzzy set of volume fractions of continuous large bubbles generated by the liquid in the region is { ZO, PS, PM, PB, PVB }, the fuzzy set of volume fractions of continuous large bubbles generated by the liquid in the region is { N, NM, M, ML, L }, and the fuzzy set of opening degrees of the intake regulating valves is { S, SM, M, MB, B }; the membership functions are all trigonometric functions.
9. The control method of an EGR cooler with observable coolant boiling of claim 8, characterized in that the control rule of the fuzzy control model is:
Volume fraction Z of liquid in zone generating continuous large bubbles3is extremely large, and the liquid in the area generates the relative change rate Delta Z of the volume ratio of continuous large bubbles3When the opening degree delta is larger, the opening degree delta of the liquid inlet regulating valve is larger; and
volume fraction Z of liquid in zone generating continuous large bubbles3Is small or zero, and the relative rate of change of the volume fraction Δ Z of the liquid in the zone to form continuous large bubbles3If the opening is small, the opening delta of the liquid inlet regulating valve is small.
10. The method of claim 9, wherein the inlet temperature reaches a critical temperature at which small bubbles appear, TLI_0Is 120 ℃; and
λ1A value of 0.88, λ2The value is 0.83.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108973595A (en) * | 2018-09-03 | 2018-12-11 | 辽宁工业大学 | A kind of utilizing exhaust gas from coach residual heat heating device and its control method |
Citations (4)
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| CN108973595A (en) * | 2018-09-03 | 2018-12-11 | 辽宁工业大学 | A kind of utilizing exhaust gas from coach residual heat heating device and its control method |
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