CN110486200A - Improved new-type EGR valve and its control method - Google Patents
Improved new-type EGR valve and its control method Download PDFInfo
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- CN110486200A CN110486200A CN201910855956.2A CN201910855956A CN110486200A CN 110486200 A CN110486200 A CN 110486200A CN 201910855956 A CN201910855956 A CN 201910855956A CN 110486200 A CN110486200 A CN 110486200A
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- 238000000034 method Methods 0.000 title claims abstract description 15
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- 230000005540 biological transmission Effects 0.000 claims abstract description 3
- 238000007789 sealing Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 5
- 238000004064 recycling Methods 0.000 claims description 4
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- 238000011897 real-time detection Methods 0.000 abstract description 4
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- 238000009792 diffusion process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
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- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
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Classifications
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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]
- F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
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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
- F02M26/45—Sensors specially adapted for EGR systems
- F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
- F02M26/47—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition the characteristics being temperatures, pressures or flow rates
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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
- F02M26/52—Systems for actuating EGR valves
- F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
- F02M26/54—Rotary actuators, e.g. step motors
-
- 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
- F02M26/66—Lift valves, e.g. poppet valves
- F02M26/67—Pintles; Spindles; Springs; Bearings; Sealings; Connections to actuators
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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
- Y02T10/40—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)
- Fluid Mechanics (AREA)
- Analytical Chemistry (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
The invention discloses a kind of improved new-type EGR valves, shell including being equipped with valve chamber, shell is equipped with the EGR cycle gas entrance being connected to respectively with valve chamber and the outlet of EGR cycle gas, valve body is movably installed in valve chamber, shell end is equipped with the valve drive device with valve body transmission connection, pressure test device is also equipped on shell, the test side of pressure test device is connected to valve chamber；Also disclose the control method of the valve, after EGR valve receives the open command that Engine ECU is assigned, valve drive device pushes valve rod first to generate quantitative displacement according to the start-up parameter demarcated in Engine ECU, then the pressure difference data in pressure test device real-time detection valve chamber, and feed back to Engine ECU, Engine ECU calculates the exhaust gas flow by EGR valve according to the pressure difference data of real-time detection, then real-time control valve drive device works, to change valve location, it realizes and the real-time closed-loop of exhaust gas flow is controlled, keep engine EGR rate control more accurate, keep engine performance more stable.
Description
Technical field
The present invention relates to technical field of engine control, more particularly to a kind of improved new-type EGR valve, further relate to the EGR
The specific control method of valve.
Background technique
As environment protection emission laws and regulations requirement is increasingly harsh, EGR valve (the exhaust gas recycling of emissions from engines can be effectively reduced
Valve) technology quickly grows, and effect is to lead to the portion of engine combustion discharge in inlet manifold again, is participated in again
Burning reduces the oxygen content in air inlet, to improve fire ring to reduce chamber temperature and improve engine operating efficiency
Border, to reduce the discharge amount of NOX, reduce pinking and extend the service life of engine.It can be seen that EGR valve is to reduce hair
The important means of motivation DS NOx Est, and egr system has at home and abroad been widely used in advanced engine at present, wherein EGR
Important component of the valve as egr system, structure type and position can all have an important influence on whole system.
There are two types of EGR valve used at present is mainly, i.e. butterfly valve and poppet, the two working principle is similar, all passes through
The adjustment of circulation area ratio in pipeline is realized in valve block position, to achieve the purpose that adjustment exhaust introduction volume.Wherein butterfly valve is by inside
Structure is limited, and can generate impact to valve block when air-flow passes through and valve block is caused to tremble, prevent it from accurately controlling exhaust gas flow；
And poppet due at single valve circulating face it is smaller, it is easy to form to shut off, so influence exhaust gas throughput, be equally difficult to essence
Exhaust gas introduction volume really is controlled, to reduce the stability and reliability of engine operation.
Summary of the invention
Exhaust gas flow in valve can be accurately detected technical problem to be solved by the invention is to provide a kind of, and then is precisely controlled
Exhaust gas introduction volume processed improves the improved new-type EGR valve of engine performance.
In order to solve the above technical problems, the technical scheme is that improved new-type EGR valve, including being equipped with valve chamber
Shell, the shell are equipped with EGR cycle gas entrance and EGR cycle gas and export, the EGR cycle gas entrance and described
The outlet of EGR cycle gas is connected to setting with the valve chamber respectively, is movably installed in the valve chamber described for being connected to or separating
The valve body of EGR cycle gas entrance and EGR cycle gas outlet, the shell end, which is equipped with to be driven with the valve body, to be connected
The valve drive device connect is also equipped with pressure test device, the test side connection of the pressure test device on the shell
To the valve chamber.
The valve chamber is equipped with the cylindrical valve chamber being connected to the EGR cycle gas entrance as a preferred technical solution,
The internal diameter of entrance, the cylindrical valve chamber outlet section with the EGR cycle gas outlet, the valve chamber entrance is less than institute
The internal diameter of valve chamber outlet section is stated, is communicated between the valve chamber entrance and the valve chamber outlet section along gas direction of travel internal diameter
Gradually big valve chamber diffuser.
The pressure test device includes the pressure difference sensing being fixedly mounted on the housing as a preferred technical solution,
Device, the differential pressure pickup is set there are two pressure detecting end, wherein a pressure detecting end corresponds to the valve chamber diffuser
Portlet or the corresponding valve chamber entrance setting, another pressure detecting end corresponds at the large port of the valve chamber diffuser
Setting.
The valve body includes axially being set in the intracorporal valve rod of the shell, the valve rod one as a preferred technical solution,
End is connect with the valve drive device, is successively set with valve plate and guide runner along gas direction of travel on the valve rod, institute
It states the valve rod upper limit between valve plate and the guide runner and is set with secondary spring, the valve plate and the valve chamber are spread
It seals and is slidably matched at the portlet of section.
The outside limit sleeve in the valve chamber positioned at EGR cycle gas outlet is equipped with as a preferred technical solution,
Pilot sleeve, closed at one end setting of the pilot sleeve close to the EGR cycle gas outlet side, the guide runner sliding
It is matched in the pilot sleeve, the valve rod is fixedly connected through the closed end of the pilot sleeve with the guide runner.
The valve drive device includes the servo electricity for being fixedly installed in the shell end as a preferred technical solution,
Machine, the valve rod are connected to the power output end of the servo motor.
The shell end is located on the inside of the servo motor and is equipped with for blocking as a preferred technical solution,
The sealing blanking cover of cavity is stated, the valve rod is arranged through the sealing blanking cover, and the other end of the shell is detachably equipped with set
Cylinder door.
The EGR cycle gas entrance and EGR cycle gas outlet are set to the shell as a preferred technical solution,
The two sides of body, and the EGR cycle gas entrance is located between the servo motor and EGR cycle gas outlet.
The invention further relates to the control method of the new-type EGR valve, the valve drive device and the differential pressure pickup point
It is not connected to Engine ECU, is included the following steps,
Step 1: bench test
Start engine, tests the engine in each temperature environment under corresponding each power operating states, the EGR
The corresponding Theoretical gas flow q of valve, and the theoretical parameter table of formation temperature, power and Theoretical gas flow q, store to the hair
In motivation ECU；
Determine Step 2: valve plate start bit installs
In the Engine ECU, the start-up parameter of the valve drive device when engine start is demarcated in advance,
The valve rod or the valve plate and the start-up parameter are corresponding with quantitative displacement parameter；
When the valve drive device receives the enabled instruction that the Engine ECU is sent, the valve body driving dress
It sets and starts and run according to the start-up parameter demarcated in the Engine ECU, drive the valve rod or the valve plate to generate quantitative
Displacement, the valve plate is mobile towards the valve chamber outlet section, the EGR cycle gas entrance, the valve chamber entrance, the valve
Chamber outlet section and the EGR cycle gas outlet, the portion of engine discharge is entered to by the EGR valve to be started
The inlet manifold of machine realizes exhaust gas recycling；
Step 3: pressure difference detection
After the valve rod or the valve plate generate quantitative displacement, a pressure detecting end detect the valve chamber diffuser into
The gas pressure of valve chamber diffuser outlet side, the pressure difference are detected in the gas pressure at gas end, another pressure detecting end
Sensor determines pressure difference △ p according to pressure value at two detected, and pressure difference △ p is sent to the Engine ECU；
Step 4: gas flow calculates
The Engine ECU calculates the real gas flow of the EGR valve, calculation formula according to pressure difference is received are as follows:
Wherein,
qm- mass flow passes through the real gas quality of the EGR valve in the unit time；
C-efflux coefficient；
The ratio between the β-valve chamber diffuser discharge area and entrance section product；
ε-the coefficient of expansion；
The discharge area of the S-EGR valve；
△ p-pressure difference, the pressure difference between the valve chamber diffuser entrance and outlet；
ρ-density, the gas density of the EGR valve inlet；
The calculation formula of coefficient of expansion ε are as follows:
Wherein,
The ratio between the β-valve chamber diffuser discharge area and entrance section product；
κ-isentropic index；
τ-pressure ratio, the ratio between the EGR valve inlet pressure and outlet pressure；
Step 4: comparison adjustment
Step 3 is calculated to the real gas flow q obtainedm, with the relevant temperature and phase stored in the Engine ECU
The Theoretical gas flow q under power is answered to be compared；
As real gas flow qmWhen < Theoretical gas flow q, the Engine ECU controls the valve drive device band
It moves the valve plate to move along gas direction of travel, increases the valve plate aperture, until real gas flow qm=Theoretical gas
Flow q；
As real gas flow qmWhen=Theoretical gas flow q, the Engine ECU controls the valve drive device and protects
Current state is held, that is, keeps the aperture of presently described valve plate；
As real gas flow qmWhen > Theoretical gas flow q, the Engine ECU controls the valve drive device band
It moves the valve plate to move along gas direction of travel, reduces the valve plate aperture, until real gas flow qm=theoretical
Gas flow q.
As improvement to above-mentioned technical proposal, the value range of the efflux coefficient c are as follows: efflux coefficient c < described in 0 <
2。
By adopting the above-described technical solution, the present invention has following technology effective: being driven by valve drive device
Valve body generates linear displacement, carrys out the gap size of application valve body and valve chamber, thus the flow of control loop exhaust gas, while passing through pressure
Pressure difference in poor detection device detection valve chamber, calculating pass through the exhaust gas flow of EGR valve in real time.Detailed process is when EGR valve receives
After the open command assigned to Engine ECU, valve drive device pushes valve rod according to the start-up parameter demarcated in Engine ECU
Quantitative displacement is first generated, then the pressure difference data in pressure test device real-time detection valve chamber, and feed back to Engine ECU, sent out
Motivation ECU calculates the exhaust gas flow by EGR valve according to the pressure difference data of real-time detection, then real-time control valve drive device
Work is realized and is controlled the real-time closed-loop of exhaust gas flow to change valve location, is kept engine EGR rate control more accurate, is made
Engine performance is more stable.
Detailed description of the invention
The following drawings are only intended to schematically illustrate and explain the present invention, not delimit the scope of the invention.Wherein:
Fig. 1 is the structural schematic diagram of the embodiment of the present invention；
Fig. 2 is the top view of the embodiment of the present invention；
Fig. 3 is the side view of the embodiment of the present invention；
Fig. 4 is the schematic diagram of the section structure of the embodiment of the present invention；
In figure: 1- shell；2- valve chamber entrance；3- valve chamber outlet section；4- valve chamber diffuser；5-EGR cycle gas entrance；
The outlet of 6-EGR cycle gas；7- valve rod；8- valve plate；9- guide runner；10- secondary spring；11- pilot sleeve；12- servo electricity
Machine；13- seals blanking cover；14- sleeve door；15- differential pressure pickup；16- pressure detecting end.
Specific embodiment
With reference to the accompanying drawings and examples, the present invention is further explained.In the following detailed description, only pass through explanation
Mode describes certain exemplary embodiments of the invention.Undoubtedly, those skilled in the art will recognize, In
In the case where without departing from the spirit and scope of the present invention, described embodiment can be repaired with a variety of different modes
Just.Therefore, attached drawing and description are regarded as illustrative in nature, and are not intended to limit the scope of the claims.
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, improved new-type EGR valve, the shell 1 including being equipped with valve chamber, specifically, institute
It states valve chamber and is equipped with the cylindrical valve chamber entrance 2 being connected to the EGR cycle gas entrance 5, exported with the EGR cycle gas
The cylindrical valve chamber outlet section 3 of 6 connections, the internal diameter of the valve chamber entrance 2 is less than the internal diameter of the valve chamber outlet section 3, described
It is communicated between valve chamber entrance 2 and the valve chamber outlet section 3 along gas direction of travel internal diameter gradually big valve chamber diffuser 4, by
This is as it can be seen that the valve chamber overall structure is arranged by the valve chamber diffuser 4 of variable-diameter structure, is convenient for similar to Venturi tube
Pressure signal in the valve chamber is detected, and realizes being precisely controlled for EGR valve flow.
The shell 1 is equipped with EGR cycle gas entrance 5 and EGR cycle gas outlet 6, the EGR cycle gas entrance
5 and EGR cycle gas outlet 6 be connected to setting with the valve chamber respectively.The EGR cycle gas entrance 5, which is connected to, to be started
The exhaust pipe of machine, the EGR cycle gas outlet 6 are connected to the inlet manifold of engine, pass through the EGR cycle gas entrance
5 and EGR cycle gas outlet 6 realize that the connection of EGR valves and engine pipelines is installed, the portion that engine is discharged
It is introduced in the gas handling system of engine by EGR valve, recirculates and utilize, to improve chamber temperature environment.
It is movably installed in the valve chamber useless for being connected to or separating the EGR cycle gas entrance 5 and EGR circulation
The valve body of gas outlet 6,1 end of shell are equipped with the valve drive device with valve body transmission connection.Specifically, described
Valve body includes the axial valve rod 7 being set in the shell 1, and described 7 one end of valve rod is connect with the valve drive device, described
Valve drive device can drive the valve rod 7 to move back and forth along the axis direction of the shell 1, with control the valve chamber with
The connection and cut-off of the EGR cycle gas entrance 5 and EGR cycle gas outlet 6 are realized described in transmitting power and control
The effect of valve chamber breathing area.
Successively be set with valve plate 8 and guide runner 9 along gas direction of travel on the valve rod 7, the valve plate 8 with it is described
7 upper limit of the valve rod between guide runner 9 is set with secondary spring 10, and the valve plate 8 is small with the valve chamber diffuser 4
Sealing is slidably matched at port, therefore the valve plate 8 is truncated cone-shaped structure.The valve drive device drives the valve body to open
When, the side that the valve rod 7 drives the valve plate 8 and the guide runner 9 to be directed away from the valve drive device is mobile, pressure
Contract the secondary spring 10, and gap is formed between the valve plate 8 and the valve chamber diffuser 4, and exhaust gas passes through the valve chamber entrance
Section 2 and the valve chamber diffuser 4 enter to the valve chamber outlet section 3, and are delivered to and are started by EGR cycle gas outlet 6
In the inlet manifold of machine, in the process, the secondary spring 10 can play certain damping action, while accumulation of energy；Engine
When stopping, under the action of the valve drive device, the valve rod 7 drives the valve plate 8 and the guide runner 9 towards leaning on
The side of the nearly valve drive device is mobile, and the secondary spring 10 discharges, and expands until the valve plate 8 is resetted with the valve chamber
Palette at the portlet of section 4 is dissipated, EGR valve is turned off, in the process, the secondary spring 10 discharges the gesture of its storage
Can, play the role of 8 return of valve plate described in boosting, and guarantee the leakproofness after the closing of valve plate 8.
Outside limit sleeve in valve chamber described in the present embodiment positioned at EGR cycle gas outlet 6 is equipped with pilot sleeve 11,
The pilot sleeve 11 exports the setting closed at one end of 6 sides close to the EGR cycle gas, and the guide runner 9 is slidably matched
In in the pilot sleeve 11, the valve rod 7 is through the closed end of the pilot sleeve 11 and the fixed company of the guide runner 9
It connects.The pilot sleeve 11 can form mobile guide to the valve rod 7 when the valve plate 8 is opened, and make described in movement
Valve plate 8 does not generate offset and abrasion.In addition, described 10 one end of secondary spring is resisted against the outer of 11 closed end of pilot sleeve
Side, 10 other end of secondary spring are resisted against on the end face of the valve plate 8, realize the limit installation of the secondary spring 10.
The valve drive device includes the servo motor 12 for being fixedly installed in 1 end of shell, and the valve rod 7 connects
In the power output end of the servo motor 12, and the servo motor 12 is micro-machine, becomes the dynamic of the valve body movement
Power source drives the valve rod 7 to rotate while generating linear displacement, and the servo motor 12 has high-precision regulating power, can
To improve accurate control of the EGR valve to exhaust gas flow.The inside installation that 1 end of shell is located at the servo motor 12 is useful
In the sealing blanking cover 13 for blocking the cavity, the valve rod 7 is arranged through the sealing blanking cover 13, the other end of the shell 1
Sleeve door 14 is detachably installed, the sealing blanking cover 13 cooperates with the sleeve door 14, realizes the valve chamber both ends
Sealing, while the sleeve door 14 cooperates with the annular protrusion being set in the valve chamber, also plays to the pilot sleeve 11
Limit fixed effect.
The present embodiment is also equipped with pressure test device on the shell 1, and the test side of the pressure test device connects
Pass to the valve chamber.Specifically, the pressure test device includes the differential pressure pickup 15 being fixedly mounted on the shell 1,
The differential pressure pickup 15 is set there are two pressure detecting end 1616, wherein the corresponding valve chamber diffusion in a pressure detecting end 16
The portlet of section 4 or the corresponding valve chamber entrance 2 are arranged, another corresponding valve chamber diffuser 4 in the pressure detecting end 16
Large port at be arranged.The differential pressure pickup 15 is used to detect the gas pressure at 4 two-port of valve chamber diffuser, and counts
Pressure difference is calculated, Engine ECU is sent to, the control by the Engine ECU to the servo motor 12 is formed after pressure difference processing
Signal processed realizes the left and right displacement adjustment of the valve plate 8, achievees the purpose that adjust EGR valve gas flow, run on engine
Optimum state.For the ease of the connection of each pipeline in EGR valve and engine, the EGR cycle gas entrance 5 and the EGR are followed
Ring waste gas outlet 6 be set to the shell 1 two sides, and the EGR cycle gas entrance 5 be located at the servo motor 12 with it is described
Between EGR cycle gas outlet 6.
When the present embodiment is in use, the valve drive device and the differential pressure pickup 15 are respectively connected to engine
ECU, specific control method the following steps are included:
Step 1: bench test
Start engine, tests the engine in each temperature environment under corresponding each power operating states, the EGR
The corresponding Theoretical gas flow q of valve, and the theoretical parameter table of formation temperature, power and Theoretical gas flow q, store to the hair
In motivation ECU.
Determine Step 2: valve plate start bit installs
In the Engine ECU, the start-up parameter of the valve drive device when engine start is demarcated in advance,
The valve rod 7 or the valve plate 8 and the start-up parameter are corresponding with quantitative displacement parameter.
When the valve drive device receives the enabled instruction that the Engine ECU is sent, the valve body driving dress
It sets and starts and run according to the start-up parameter demarcated in the Engine ECU, drive the valve rod 7 or the valve plate 8 to generate fixed
Amount displacement, the valve plate 8 is mobile towards the valve chamber outlet section 3, the EGR cycle gas entrance 5, the valve chamber entrance 2,
The valve chamber outlet section 3 and the EGR cycle gas outlet 6 be connected to, the portion that engine is discharged by the EGR valve into
Enter to the inlet manifold of engine, realizes exhaust gas recycling.
Step 3: pressure difference detection
After the valve rod 7 or the valve plate 8 generate quantitative displacement, the valve chamber diffusion is detected at a pressure detecting end 16
The gas pressure of 4 outlet side of valve chamber diffuser is detected at the gas pressure of 4 inlet ends of section, another pressure detecting end 16,
The differential pressure pickup 15 determines pressure difference △ p according to pressure value at two detected, and pressure difference △ p is sent to described
Engine ECU.
Step 4: gas flow calculates
The Engine ECU calculates the real gas flow of the EGR valve, calculation formula according to pressure difference is received are as follows:
Wherein,
qm- mass flow passes through the real gas quality of the EGR valve in the unit time；
C-efflux coefficient indicates the coefficient of relationship between actual flow and theoretical flow by device, the outflow system
The specific value range of number c are as follows: efflux coefficient c < 2 described in 0 <；
The ratio between the β-valve chamber diffuser discharge area and entrance section product, wherein the entrance of the valve chamber diffuser 4
Sectional area is definite value, and the discharge area of the valve chamber diffuser 4 is changing value, and the occurrence of the area is by the valve plate 8
It is determined in the specific location of the valve chamber diffuser 4.It is specific to determine method are as follows: the valve chamber expands at 8 large end face of valve plate
The area for dissipating section 4 subtracts the area of 8 large end face of valve plate, i.e., valve chamber diffuser 4 and institute described in described 7 moving process of valve rod
State the gap sectional area generated between 8 large end face of valve plate, the value can the Engine ECU and the servo motor 12 cooperation
Lower automatic measurement & calculation goes out；
ε-the coefficient of expansion；
The discharge area of the S-EGR valve；
△ p-pressure difference, the pressure difference between the valve chamber diffuser entrance and outlet；
ρ-density, the gas density of the EGR valve inlet, specific value can be by technical field of engines routine techniques
Means obtain.
The calculation formula of coefficient of expansion ε are as follows:
Wherein,
The ratio between β -4 discharge area of valve chamber diffuser and entrance section product；
κ-isentropic index, and be constant, it defaults in the Engine ECU；
τ-pressure ratio, the ratio between the EGR valve inlet pressure and outlet pressure, i.e., described 5 pressure of EGR cycle gas entrance
The ratio between 6 pressure are exported with the EGR cycle gas.
Step 4: comparison adjustment
Step 3 is calculated to the real gas flow q obtainedm, with the relevant temperature and phase stored in the Engine ECU
The Theoretical gas flow q under power is answered to be compared.
As real gas flow qmWhen < Theoretical gas flow q, the Engine ECU controls the valve drive device band
It moves the valve plate 8 to move along gas direction of travel, increases 8 aperture of valve plate, until real gas flow qm=theory gas
Body flow q.
As real gas flow qmWhen=Theoretical gas flow q, the Engine ECU controls the valve drive device and protects
Current state is held, that is, keeps the aperture of presently described valve plate 8.
As real gas flow qmWhen > Theoretical gas flow q, the Engine ECU controls the valve drive device band
It moves the valve plate 8 to move along gas direction of travel, reduces 8 aperture of valve plate, until real gas flow qm=reason
By gas flow q.
By the system building of Engine ECU, make EGR valve that the closed-loop control to exhaust gas flow be integrally formed, makes to enter
The exhaust gas flow of engine is more accurate, regulates the speed faster in real time, so that it is guaranteed that the performance of engine is more reliable and more stable.
The above shows and describes the basic principle, main features and advantages of the invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (10)
1. improved new-type EGR valve, the shell including being equipped with valve chamber, it is characterised in that: the shell is equipped with EGR cycle gas
Entrance and EGR cycle gas outlet, the EGR cycle gas entrance and the EGR cycle gas outlet respectively with the valve chamber
Connection is arranged, and is movably installed in the valve chamber useless for being connected to or separating the EGR cycle gas entrance and EGR circulation
The valve body of gas outlet, the shell end are equipped with the valve drive device with valve body transmission connection, go back on the shell
Pressure test device is installed, the test side of the pressure test device is connected to the valve chamber.
2. improved new-type EGR valve as described in claim 1, it is characterised in that: the valve chamber is equipped with useless with EGR circulation
The cylindrical valve chamber entrance of gas entrance connection, the cylindrical valve chamber outlet section with the EGR cycle gas outlet are described
The internal diameter of valve chamber entrance is less than the internal diameter of the valve chamber outlet section, connects between the valve chamber entrance and the valve chamber outlet section
It is connected with along gas direction of travel internal diameter gradually big valve chamber diffuser.
3. improved new-type EGR valve as claimed in claim 2, it is characterised in that: the pressure test device includes fixed peace
The differential pressure pickup of dress on the housing, the differential pressure pickup are set there are two pressure detecting end, wherein a pressure inspection
Portlet or the corresponding valve chamber entrance setting that end corresponds to the valve chamber diffuser are surveyed, another pressure detecting end corresponds to
It is arranged at the large port of the valve chamber diffuser.
4. improved new-type EGR valve as claimed in claim 3, it is characterised in that: the valve body includes described in axial be set in
The intracorporal valve rod of shell, described valve rod one end are connect with the valve drive device, on the valve rod successively along gas direction of travel
It is set with valve plate and guide runner, the valve rod upper limit between the valve plate and the guide runner is set with auxiliary bullet
It seals and is slidably matched at spring, the valve plate and the portlet of the valve chamber diffuser.
5. improved new-type EGR valve as claimed in claim 4, it is characterised in that: it is useless to be located at EGR circulation in the valve chamber
The outside limit sleeve of gas outlet is equipped with pilot sleeve, an end seal of the pilot sleeve close to the EGR cycle gas outlet side
Setting is closed, the guide runner is snug fit in the pilot sleeve, and the valve rod runs through the closed end of the pilot sleeve
It is fixedly connected with the guide runner.
6. improved new-type EGR valve as claimed in claim 4, it is characterised in that: the valve drive device includes fixed peace
Servo motor loaded on the shell end, the valve rod are connected to the power output end of the servo motor.
7. improved new-type EGR valve as claimed in claim 6, it is characterised in that: the shell end is located at the servo electricity
Sealing blanking cover for blocking the cavity is installed, the valve rod is arranged through the sealing blanking cover, the shell on the inside of machine
The other end of body is detachably equipped with sleeve door.
8. improved new-type EGR valve as claimed in claim 6, it is characterised in that: the EGR cycle gas entrance and described
EGR cycle gas outlet be set to the shell two sides, and the EGR cycle gas entrance be located at the servo motor with it is described
Between the outlet of EGR cycle gas.
9. the control method of improved new-type EGR valve as claimed in claim 4, the valve drive device and the pressure difference pass
Sensor is respectively connected to Engine ECU, it is characterised in that: includes the following steps,
Step 1: bench test
Start engine, tests the engine in each temperature environment under corresponding each power operating states, the EGR valve phase
The Theoretical gas flow q answered, and the theoretical parameter table of formation temperature, power and Theoretical gas flow q, store to the engine
In ECU；
Determine Step 2: valve plate start bit installs
In the Engine ECU, the start-up parameter of the valve drive device when engine start is demarcated in advance, it is described
Valve rod or the valve plate and the start-up parameter are corresponding with quantitative displacement parameter；
When the valve drive device receives the enabled instruction that the Engine ECU is sent, the valve drive device is pressed
Start and run according to the start-up parameter demarcated in the Engine ECU, the valve rod or the valve plate is driven to generate quantitative displacement,
The valve plate is mobile towards the valve chamber outlet section, and the EGR cycle gas entrance, the valve chamber entrance, the valve chamber go out
The portion of mouth section and the EGR cycle gas outlet, engine discharge enters to engine by the EGR valve
Inlet manifold realizes exhaust gas recycling；
Step 3: pressure difference detection
After the valve rod or the valve plate generate quantitative displacement, the valve chamber diffuser inlet end is detected at a pressure detecting end
Gas pressure, the gas pressure of valve chamber diffuser outlet side, the pressure difference sensing are detected in another pressure detecting end
Device determines pressure difference △ p according to pressure value at two detected, and pressure difference △ p is sent to the Engine ECU；
Step 4: gas flow calculates
The Engine ECU calculates the real gas flow of the EGR valve, calculation formula according to pressure difference is received are as follows:
Wherein,
qm- mass flow passes through the real gas quality of the EGR valve in the unit time；
C-efflux coefficient；
The ratio between the β-valve chamber diffuser discharge area and entrance section product；
ε-the coefficient of expansion；
The discharge area of the S-EGR valve；
△ p-pressure difference, the pressure difference between the valve chamber diffuser entrance and outlet；
ρ-density, the gas density of the EGR valve inlet；
The calculation formula of coefficient of expansion ε are as follows:
Wherein,
The ratio between the β-valve chamber diffuser discharge area and entrance section product；
κ-isentropic index；
τ-pressure ratio, the ratio between the EGR valve inlet pressure and outlet pressure；
Step 4: comparison adjustment
Step 3 is calculated to the real gas flow q obtainedm, with the relevant temperature and corresponding power stored in the Engine ECU
Under Theoretical gas flow q be compared；
As real gas flow qmWhen < Theoretical gas flow q, the Engine ECU controls the valve drive device and drives institute
It states valve plate to move along gas direction of travel, increases the valve plate aperture, until real gas flow qm=Theoretical gas flow
q；
As real gas flow qmWhen=Theoretical gas flow q, the Engine ECU controls the valve drive device holding and works as
Preceding state keeps the aperture of presently described valve plate；
As real gas flow qmWhen > Theoretical gas flow q, the Engine ECU controls the valve drive device and drives institute
It states valve plate to move along gas direction of travel, reduces the valve plate aperture, until real gas flow qm=Theoretical gas
Flow q.
10. the control method of improved new-type EGR valve as claimed in claim 9, it is characterised in that: the efflux coefficient c's
Value range are as follows: efflux coefficient c < 2 described in 0 <.
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| CN112361040A (en) * | 2021-01-13 | 2021-02-12 | 潍柴动力股份有限公司 | Check valve |
| CN114992005A (en) * | 2022-05-12 | 2022-09-02 | 东风汽车股份有限公司 | Mounting structure and mounting method of plug-in EGR valve and intake manifold |
| CN115142995A (en) * | 2022-07-13 | 2022-10-04 | 联合汽车电子有限公司 | Monitoring method, device and system of exhaust gas recirculation system and storage medium |
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Application publication date: 20191122 |