CN112601884A - Method for controlling operation of exhaust gas recirculation device and exhaust gas recirculation device - Google Patents
Method for controlling operation of exhaust gas recirculation device and exhaust gas recirculation device Download PDFInfo
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- CN112601884A CN112601884A CN201980058353.8A CN201980058353A CN112601884A CN 112601884 A CN112601884 A CN 112601884A CN 201980058353 A CN201980058353 A CN 201980058353A CN 112601884 A CN112601884 A CN 112601884A
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- 238000000034 method Methods 0.000 title claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000004364 calculation method Methods 0.000 claims abstract description 17
- 238000004891 communication Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 description 100
- 238000002485 combustion reaction Methods 0.000 description 8
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 239000000446 fuel Substances 0.000 description 6
- 238000011144 upstream manufacturing Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- JEAQATRYHARRAU-UHFFFAOYSA-N 4-amino-3-pentadecylphenol Chemical compound CCCCCCCCCCCCCCCC1=CC(O)=CC=C1N JEAQATRYHARRAU-UHFFFAOYSA-N 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- 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]
- F02D41/0065—Specific aspects of external EGR control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0406—Layout of the intake air cooling or coolant circuit
- F02B29/0437—Liquid cooled heat exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0493—Controlling the air charge temperature
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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
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream 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
- F02M26/22—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
- F02M26/25—Layout, e.g. schematics with coolers having bypasses
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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
- F02M26/33—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
- 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]
- F02D41/0065—Specific aspects of external EGR control
- F02D2041/0067—Determining the EGR temperature
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Supercharger (AREA)
Abstract
The invention can ensure the target EGR flow rate reliably and restrain and prevent the generation of condensed water. In an electronic control unit (50), the temperature on the downstream side of an intercooler, which is a target temperature near the outlet of a water-cooled intercooler (14), is calculated, and the calculation result is used for controlling the exhaust gas recirculation amount of a low-pressure exhaust gas recirculation passage (6), while the dew point near the outlet of the water-cooled intercooler (14) is calculated, the calculated dew point and the temperature on the downstream side of the intercooler are compared, and the higher one is used as the target temperature near the outlet of the water-cooled intercooler (14), and the water amount adjustment of the water-cooled intercooler (14) is executed, thereby suppressing the generation of condensed water near the outlet of the water-cooled intercooler (14), preventing the occurrence of condensed water, and ensuring a target EGR amount.
Description
Technical Field
The present invention relates to an operation control method for an Exhaust Gas Recirculation (EGR) device and an exhaust gas recirculation device, and more particularly, to an operation control method for an Exhaust Gas Recirculation (EGR) device and an exhaust gas recirculation device that improve the operation efficiency of an exhaust gas recirculation device having a configuration with two exhaust gas recirculation passages of high pressure and low pressure.
Background
Conventionally, various exhaust gas recirculation apparatuses have been proposed and put into practical use in order to improve the emission characteristics of internal combustion engines.
Specifically, for example, a device having a structure in which two exhaust gas recirculation passages are provided, the high-pressure exhaust gas recirculation passage communicating an exhaust manifold and an intake manifold of an internal combustion engine, and the low-pressure exhaust gas recirculation passage communicating a downstream side of a turbine disposed in an exhaust pipe and an upstream side of a compressor disposed in an intake pipe, and the like are known (for example, see patent document 1 and the like).
The exhaust gas recirculation device having two exhaust gas recirculation passages can perform appropriate recirculation control of exhaust gas by using a high-pressure exhaust gas recirculation passage and a low-pressure exhaust gas recirculation passage separately in accordance with the operating state of the internal combustion engine.
However, in the above-described exhaust gas recirculation device having two exhaust gas recirculation passages of high pressure and low pressure, the exhaust gas containing more moisture than the fresh air on the intake pipe side is caused to flow back from the low pressure exhaust gas recirculation passage by the combustion of the fuel, and therefore condensation tends to occur on the downstream side of the intercooler provided in the intake pipe. When the condensed water is sucked into the internal combustion engine, a so-called water hammer phenomenon occurs, and the internal combustion engine may be damaged.
As a measure for solving such a problem, a method of calculating the maximum allowable amount of reflux of the low-pressure exhaust gas recirculation passage in which the condensed water does not occur downstream of the intercooler by a predetermined arithmetic expression or the like, and preventing the occurrence of the condensed water by limiting the amount of reflux have been known.
Patent document 1: japanese patent laid-open No. 2007-126995.
Disclosure of Invention
However, limiting the amount of recirculation in the low-pressure exhaust gas recirculation passage may result in a possibility that the target EGR amount as the whole exhaust gas recirculation apparatus cannot be achieved, and as a result, NOxThis increases the number of exhaust gas recirculation devices, and thus the inherent significance of the provision of the exhaust gas recirculation devices is lost.
The present invention has been made in view of the above circumstances, and provides an operation control method for an exhaust gas recirculation device and an exhaust gas recirculation device, which can reliably ensure a target EGR flow rate and can suppress and prevent the generation of condensed water.
In order to achieve the above object of the present invention, an operation control method of an exhaust gas recirculation system according to the present invention is an exhaust gas recirculation operation control method of an exhaust gas recirculation system, wherein the exhaust gas recirculation system is provided with two exhaust gas recirculation passages, namely a high-pressure exhaust gas recirculation passage and a low-pressure exhaust gas recirculation passage, and a water-cooled intercooler is disposed in a gas intake pipe, and a temperature on a downstream side of the intercooler, which is a target temperature in the vicinity of an outlet of the water-cooled intercooler, is calculated by calculation and used for controlling an exhaust gas recirculation amount of the low-pressure exhaust gas recirculation passage, wherein a dew point in the vicinity of the outlet of the water-cooled intercooler is calculated, and a higher one of the dew point and the downstream side temperature of the intercooler is set as a target intake gas temperature in the vicinity of the outlet of the water-cooled intercooler, the water amount of the water-cooled intercooler is adjusted.
Further, in order to achieve the above object of the present invention, an exhaust gas recirculation device according to the present invention is an exhaust gas recirculation device including two exhaust gas recirculation passages, a high pressure exhaust gas recirculation passage and a low pressure exhaust gas recirculation passage, and a water-cooled intercooler disposed in an intake pipe, and an electronic control unit configured to control an exhaust gas recirculation amount of each of the high pressure exhaust gas recirculation passage and the low pressure exhaust gas recirculation passage, the electronic control unit calculating a temperature on a downstream side of the intercooler as a target temperature in a vicinity of an outlet of the water-cooled intercooler, and using a calculation result thereof for control of the exhaust gas recirculation amount of the low pressure exhaust gas recirculation passage, wherein the electronic control unit is configured to calculate a dew point in the vicinity of the outlet of the water-cooled intercooler, the water amount of the water-cooled intercooler is adjusted by setting the higher temperature as the target intake air temperature in the vicinity of the outlet of the water-cooled intercooler compared with the temperature on the downstream side of the intercooler.
Effects of the invention
The present invention can provide an exhaust gas recirculation device having a higher operation efficiency than the conventional device, by controlling the amount of water in the water-cooled intercooler on the downstream side of the variable compressor to suppress and prevent the occurrence of condensed water, and thereby controlling the amount of exhaust gas recirculation in the low-pressure exhaust gas recirculation passage without considering the occurrence of condensed water by the conventional control processing, and thus reliably ensuring the target EGR amount.
Drawings
Fig. 1 is a configuration diagram showing a configuration example of an exhaust gas recirculation device according to an embodiment of the present invention.
Fig. 2 is a subroutine flowchart showing the flow of the exhaust gas recirculation operation control process executed in the exhaust gas recirculation device according to the embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to fig. 1 and 2.
The components, arrangement, and the like described below are not limited to the present invention, and various changes can be made within the spirit and scope of the present invention.
First, a configuration example of an exhaust gas recirculation device according to an embodiment of the present invention will be described with reference to fig. 1.
The exhaust gas recirculation apparatus according to the embodiment of the present invention has a structure in which two exhaust gas recirculation passages, a high-pressure exhaust gas recirculation passage 5 and a low-pressure exhaust gas recirculation passage 6, are provided, and this structure is known per se.
In the exhaust gas recirculation system according to the embodiment of the present invention, the engine 1 as an internal combustion engine is, for example, a diesel engine.
An intake pipe 2 for taking in air necessary for combustion of fuel is connected to an intake manifold 4a of the engine 1, and an exhaust pipe 3 for exhausting is connected to an exhaust manifold 4 b.
A high-pressure exhaust gas recirculation passage 5 is provided between an appropriate portion in the vicinity of the intake manifold 4a of the intake pipe 2 and an appropriate portion in the vicinity of the exhaust manifold 4b of the exhaust pipe 3 to communicate with each other.
In the high-pressure exhaust gas recirculation passage 5, a high-pressure EGR valve 7 for adjusting a communication state of the high-pressure exhaust gas recirculation passage 5, in other words, for adjusting a recirculation amount of the exhaust gas, and a high-pressure EGR cooler 8 for cooling the passing exhaust gas are arranged in this order from the intake pipe 2 side.
Furthermore, bypass passages 9 that communicate the vicinities of both ends of the high-pressure EGR cooler 8 are provided in the high-pressure exhaust gas recirculation passage 5 near both ends of the high-pressure EGR cooler 8. A bypass valve 10 is provided at an end portion on the upstream side of the bypass passage 9, that is, on the exhaust manifold 4b side, and the bypass amount can be adjusted.
A variable swirler 11 having a known structure including a compressor 13 provided in the intake pipe 2 and a variable turbine 12 provided in the exhaust pipe 3 as main components is provided.
That is, the compressor 13 is provided at an appropriate position of the intake pipe 2 on the upstream side of the high-pressure exhaust gas recirculation passage 5, and the variable turbine 12 is provided at an appropriate position of the exhaust pipe 3 on the downstream side of the high-pressure exhaust gas recirculation passage 5.
The variable turbine 11 can rotate the compressor 13 by the rotational force obtained by the variable turbine 12, and send compressed air as intake air to the intake manifold 4 a.
Further, a water-cooled intercooler 14 for cooling intake air is provided in the intake pipe 2 at an appropriate position between the high-pressure exhaust gas recirculation passage 5 and the variable swirler 11 described above.
The water-cooled intercooler 14 can adjust the amount of water by a flow rate adjusting pump (indicated by "P" in fig. 1), and the water-cooled intercooler 14 itself is the same as the conventional one.
Further, an intake throttle valve 16 for adjusting the amount of intake air is provided between the water-cooled intercooler 14 and the high-pressure exhaust gas recirculation passage 5.
Further, a low-pressure exhaust gas recirculation passage 6 is provided at an appropriate position of the intake pipe 2 on the upstream side of the compressor 13 and the exhaust pipe 3 on the downstream side of the variable turbine 12 to communicate with each other.
In the low-pressure exhaust gas recirculation passage 6, a low-pressure EGR cooler 19 and a low-pressure EGR valve 20 are provided in this order from the exhaust pipe 3 side.
Further, in the exhaust pipe 3 between the low-pressure exhaust gas recirculation passage 6 and the variable turbine 12, a nitrogen oxide Storage reduction Catalyst (NOx Storage Catalyst)17 for exhaust gas purification, and a Diesel Particulate Filter (Diesel Particulate Filter)18 are provided in this order from the variable turbine 12 side to the downstream side.
On the other hand, an air cleaner 21, an air mass sensor 22 for measuring an intake air amount, and a low-pressure throttle valve 23 are provided in the intake pipe 2 in order from the upstream side to the downstream side of a communication portion communicating with the low-pressure exhaust gas recirculation passage 6. The air quality sensor 22 incorporates a temperature sensor, and can measure the intake air temperature.
The exhaust gas recirculation device according to the embodiment of the present invention is provided with various sensors described below.
First, a humidity sensor 31 is provided between the air filter 21 and the air quality sensor 22 of the intake pipe 2.
Further, an intake pressure sensor 32 and an intercooler downstream temperature sensor 33 are provided in the intake pipe 2 between the connection portion between the intake throttle valve 16 and the high-pressure exhaust gas recirculation passage 5. The intake pressure of the engine 1 can be detected by an intake pressure sensor 32, and the temperature on the downstream side of the water-cooled intercooler 14 can be detected by an intercooler downstream side temperature sensor 33.
Further, in the exhaust pipe 3, a 1 st exhaust gas temperature sensor 34 and a 1 st oxygen sensor 36 are provided in this order from the upstream side between the variable turbine 12 and a nitrogen oxide storage reduction catalyst (hereinafter referred to as "NSC") 17.
Further, a 2 nd exhaust gas temperature sensor 35 is provided between the NSC17 and the diesel particulate filter (hereinafter referred to as "DPF") 18, and a 2 nd oxygen sensor 37 is provided between a connection portion of the exhaust pipe 3 to the low-pressure exhaust gas recirculation passage 6 and the DPF "18.
Further, an exhaust differential pressure sensor 38 is provided at a position where the DPF18 is provided, and can detect a pressure difference before and after the DPF 18.
Further, a low-pressure differential pressure sensor 39 is provided in the low-pressure EGR valve 20 of the low-pressure exhaust gas recirculation passage 6, and can detect the pressure difference between the front and rear of the low-pressure EGR valve 20.
The operations of the high-pressure EGR valve 7, the bypass valve 10, the flow rate adjusting pump 15, the intake throttle valve 16, the low-pressure EGR valve 20, the low-pressure throttle valve 23, and the like described above can be controlled by the electronic control unit 50. The operation of the variable turbine 12 and the like described above can also be controlled by the electronic control unit 50.
The electronic control unit 50 includes a storage element (not shown) such as a Random Access Memory (RAM) or a Read Only Memory (ROM) as a center, for example, a microcomputer having a known and publicly known configuration, and is configured with an input/output interface circuit (not shown) as a main component.
The electronic control unit 50 receives various signals necessary for controlling the operation of the vehicle, such as the atmospheric pressure, the engine speed, the accelerator opening, and the engine coolant water temperature, which are detected by sensors not shown, together with detection signals of the air mass sensor 22, the humidity sensor 31, the intake pressure sensor 32, the intercooler downstream side temperature sensor 33, the 1 st exhaust gas temperature sensor 34, the 1 st oxygen sensor 36, the 2 nd exhaust gas temperature sensor 35, the 2 nd oxygen sensor 37, the exhaust differential pressure sensor 38, and the low pressure differential pressure sensor 39.
The various detection signals input to the electronic control unit 50 as described above are used for fuel injection control processing of a fuel injection valve (not shown), exhaust gas recirculation operation control in an embodiment of the present invention described later, and the like.
Next, an exhaust gas recirculation operation control process according to an embodiment of the present invention executed by the electronic control unit 50 will be described with reference to fig. 2.
First, the electronic control unit 50 according to the embodiment of the present invention is premised on a configuration in which operation control of the engine 1 such as fuel injection control of a fuel injection valve (not shown) and rotation control of the engine 1 can be executed as in the conventional case.
When the control of the electronic control unit 50 is started, various calculation elements necessary for calculating the dew point, which will be described later, are first input (see step S100 in fig. 2).
Specific various calculation elements of the embodiment of the present invention are the relative humidity, the intercooler downstream side supercharging pressure, the intercooler downstream side temperature, the atmospheric pressure, the outside air temperature, the excess air ratio, the intake air amount, and the low-pressure communication passage air amount.
The calculation element used for calculating the dew point is a minimum required calculation element. Therefore, the accuracy of the calculated dew point can be improved by further adding a new calculation element to these calculation elements as appropriate.
The relative humidity is detected by the humidity sensor 31.
The intercooler downstream side boost pressure is the boost pressure on the downstream side of the water-cooled intercooler 14. In the embodiment of the present invention, a value calculated by calculation based on a supercharging model conventionally used in supercharging pressure control is used.
The intercooler downstream side temperature is detected by an intercooler downstream side temperature sensor 33.
The atmospheric pressure is detected by an atmospheric pressure sensor, not shown, and the outside air temperature is detected by an outside air temperature sensor, also not shown.
The excess air ratio is detected by the 2 nd oxygen sensor 37.
The intake air amount is detected by the air quality sensor 22.
The low-pressure communication passage air amount is an exhaust gas amount passing through the low-pressure exhaust gas recirculation passage 6, and is a calculated value calculated by calculation. The calculation for obtaining the calculated value of the low-pressure communication passage air amount requires using the intake air amount detected by the air mass sensor 22 and the differential pressure between the front and rear of the low-pressure EGR valve 20 detected by the low-pressure differential pressure sensor 39 as one parameter.
Next, the dew point at the downstream of the water-cooled intercooler 14, that is, in the vicinity of the outlet is calculated based on a calculation formula preset by the above-mentioned various calculation elements (see step S200 in fig. 2).
The calculation formula for determining the dew point in the vicinity of the outlet of the water-cooled intercooler 14 is preferably determined based on the test results, simulation results, and the like in consideration of the optimum formula, which differs depending on the exhaust gas recirculation device, the specific specifications of the vehicle, and the like.
Next, it is determined whether or not the dew point calculated as described above exceeds a target temperature on the downstream side of the water-cooled intercooler 14 (hereinafter, referred to as "intercooler downstream side target temperature" for convenience of description) (see step S300 in fig. 2).
Here, the target temperature on the downstream side of the intercooler is calculated by arithmetic processing in order to control the exhaust gas recirculation amount of the exhaust gas recirculation passage on the low pressure side in the exhaust gas recirculation device having a configuration with two exhaust gas recirculation passages of high pressure and low pressure.
This arithmetic processing is not specific to the present invention but has been conventionally performed.
The exhaust gas recirculation device according to the embodiment of the present invention is premised on the basic exhaust gas recirculation control such as the above-described arithmetic processing being executed in the same manner as in the conventional art.
Then, in step S300, when it is determined that the dew point exceeds the target temperature on the intercooler downstream side (in the case of yes), the dew point is selected as the target intake air temperature in the vicinity of the outlet of the water-cooled intercooler 14 (see step S400 in fig. 2).
On the other hand, when it is determined in step 300 that the dew point does not exceed the target temperature on the intercooler downstream side (in the case of no), the target intercooler downstream side temperature is selected as the target intake air temperature in the vicinity of the outlet of the water-cooled intercooler 14 (see step S500 in fig. 2). Here, the "target intake air temperature" means a target temperature of air to be supercharged to the intake manifold 4 a.
Next, in step S600, the drive control of the flow rate adjusting pump 15 of the electronic control unit 15 is performed, and the water amount of the water-cooled intercooler 14 is adjusted so that the target intake air temperature in the vicinity of the outlet of the water-cooled intercooler 14 becomes a certain temperature selected as described above.
As a result, the exhaust gas recirculation amount of the low-pressure exhaust gas recirculation passage 6 can be controlled by the conventional control process without considering the occurrence of condensed water near the outlet of the water-cooled intercooler 14, and the target EGR amount can be reliably secured.
Industrial applicability
The present invention can be applied to an exhaust gas recirculation device that is desired to ensure a target EGR flow rate and suppress and prevent the generation of condensed water.
Description of the reference numerals
An engine
High pressure exhaust gas recirculation passage
A low pressure exhaust gas recirculation passage
A water cooled intercooler
An electronic control unit.
Claims (4)
1. An exhaust gas recirculation operation control method for an exhaust gas recirculation device,
the exhaust gas recirculation device is provided with two exhaust gas recirculation passages of a high pressure exhaust gas recirculation passage and a low pressure exhaust gas recirculation passage, and a water-cooled intercooler is disposed in the intake pipe, and a temperature on the downstream side of the intercooler, which is a target temperature in the vicinity of the outlet of the water-cooled intercooler, is calculated by calculation and used for controlling the exhaust gas recirculation amount in the low pressure exhaust gas recirculation passage, and the method for controlling the exhaust gas recirculation operation is characterized in that,
the dew point near the outlet of the water-cooled intercooler is calculated, and the higher dew point is set as a target intake air temperature near the outlet of the water-cooled intercooler as compared with the temperature on the downstream side of the intercooler, thereby adjusting the water amount of the water-cooled intercooler.
2. The exhaust gas recirculation action control method according to claim 1,
the dew point is calculated by using at least the relative humidity, the supercharging pressure on the downstream side of the water-cooled intercooler, the temperature on the downstream side of the water-cooled intercooler, the atmospheric pressure, the outside air temperature, the excess air ratio in the vicinity of the inlet of the low-pressure exhaust gas recirculation passage, the intake air amount, and the air amount of the low-pressure communication passage.
3. An exhaust gas recirculation device provided with two exhaust gas recirculation passages, a high pressure exhaust gas recirculation passage and a low pressure exhaust gas recirculation passage, and a water-cooled intercooler in an intake pipe, and an electronic control unit configured to be able to control the respective exhaust gas recirculation amounts of the high pressure exhaust gas recirculation passage and the low pressure exhaust gas recirculation passage, the electronic control unit calculating a temperature on a downstream side of the intercooler as a target temperature in the vicinity of an outlet of the water-cooled intercooler, and using the calculation result for control of the exhaust gas recirculation amount of the low pressure exhaust gas recirculation passage,
the electronic control unit is configured to calculate a dew point in the vicinity of the outlet of the water-cooled intercooler, and adjust the water amount of the water-cooled intercooler by setting a higher dew point as a target intake air temperature in the vicinity of the outlet of the water-cooled intercooler as compared with a temperature downstream of the intercooler.
4. The exhaust gas recirculation apparatus according to claim 3,
the electronic control unit is configured to calculate the dew point using at least a relative humidity, a boost pressure on a downstream side of the water-cooled intercooler, a temperature on the downstream side of the water-cooled intercooler, an atmospheric pressure, an outside air temperature, an excess air ratio in the vicinity of an inlet of the low-pressure exhaust gas recirculation passage, an intake air amount, and an air amount of the low-pressure communication passage.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-167306 | 2018-09-06 | ||
| JP2018167306A JP2020041435A (en) | 2018-09-06 | 2018-09-06 | Operation control method for exhaust gas recirculation device, and exhaust gas recirculation device |
| PCT/IB2019/057178 WO2020049406A1 (en) | 2018-09-06 | 2019-08-27 | Operation control method of exhaust gas recirculation device and exhaust gas recirculation device |
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| CN112601884A true CN112601884A (en) | 2021-04-02 |
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| CN201980058353.8A Pending CN112601884A (en) | 2018-09-06 | 2019-08-27 | Method for controlling operation of exhaust gas recirculation device and exhaust gas recirculation device |
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| Country | Link |
|---|---|
| JP (1) | JP2020041435A (en) |
| KR (1) | KR20210033539A (en) |
| CN (1) | CN112601884A (en) |
| DE (1) | DE112019004483T5 (en) |
| WO (1) | WO2020049406A1 (en) |
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| CN112211756A (en) * | 2020-09-26 | 2021-01-12 | 昆明云内动力股份有限公司 | Low-pressure EGR system and gas flow control method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050103014A1 (en) * | 2003-11-19 | 2005-05-19 | Shizuo Sasaki | Dual loop exhaust gas recirculation system for diesel engines and method of operation |
| JP2012163082A (en) * | 2011-02-09 | 2012-08-30 | Toyota Motor Corp | Exhaust gas recirculation device of internal combustion engine |
| US20140046511A1 (en) * | 2012-08-08 | 2014-02-13 | Electro-Motive Diesel, Inc. | System for controlling engine inlet air temperature |
| CN204200405U (en) * | 2014-10-16 | 2015-03-11 | 潍柴动力股份有限公司 | EGR constituent |
| US20150089941A1 (en) * | 2013-09-30 | 2015-04-02 | Mazda Motor Corporation | Exhaust gas recirculation control device of engine |
| WO2015071723A2 (en) * | 2013-11-12 | 2015-05-21 | Toyota Jidosha Kabushiki Kaisha | Control device for internal combustion engine |
| CN106471240A (en) * | 2014-06-20 | 2017-03-01 | 丰田自动车株式会社 | Control system for internal combustion engine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4670592B2 (en) | 2005-11-01 | 2011-04-13 | トヨタ自動車株式会社 | Exhaust gas recirculation system for internal combustion engines |
| US9650946B2 (en) * | 2013-08-15 | 2017-05-16 | Ford Global Technologies, Llc | Method for estimating charge air cooler condensation storage and/or release with two intake oxygen sensors |
| US9416740B2 (en) * | 2014-02-27 | 2016-08-16 | Ford Global Technologies, Llc | Method for estimating charge air cooler condensation storage with an intake oxygen sensor while exhaust gas recirculation is flowing |
-
2018
- 2018-09-06 JP JP2018167306A patent/JP2020041435A/en active Pending
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2019
- 2019-08-27 DE DE112019004483.4T patent/DE112019004483T5/en active Pending
- 2019-08-27 KR KR1020217006499A patent/KR20210033539A/en not_active Application Discontinuation
- 2019-08-27 WO PCT/IB2019/057178 patent/WO2020049406A1/en active Application Filing
- 2019-08-27 CN CN201980058353.8A patent/CN112601884A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050103014A1 (en) * | 2003-11-19 | 2005-05-19 | Shizuo Sasaki | Dual loop exhaust gas recirculation system for diesel engines and method of operation |
| JP2012163082A (en) * | 2011-02-09 | 2012-08-30 | Toyota Motor Corp | Exhaust gas recirculation device of internal combustion engine |
| US20140046511A1 (en) * | 2012-08-08 | 2014-02-13 | Electro-Motive Diesel, Inc. | System for controlling engine inlet air temperature |
| US20150089941A1 (en) * | 2013-09-30 | 2015-04-02 | Mazda Motor Corporation | Exhaust gas recirculation control device of engine |
| WO2015071723A2 (en) * | 2013-11-12 | 2015-05-21 | Toyota Jidosha Kabushiki Kaisha | Control device for internal combustion engine |
| CN106471240A (en) * | 2014-06-20 | 2017-03-01 | 丰田自动车株式会社 | Control system for internal combustion engine |
| CN204200405U (en) * | 2014-10-16 | 2015-03-11 | 潍柴动力股份有限公司 | EGR constituent |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020049406A1 (en) | 2020-03-12 |
| DE112019004483T5 (en) | 2021-07-08 |
| JP2020041435A (en) | 2020-03-19 |
| KR20210033539A (en) | 2021-03-26 |
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