CN109738197B - It takes gas angle setting unit and takes gas angle determination method - Google Patents
It takes gas angle setting unit and takes gas angle determination method Download PDFInfo
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- CN109738197B CN109738197B CN201910263935.1A CN201910263935A CN109738197B CN 109738197 B CN109738197 B CN 109738197B CN 201910263935 A CN201910263935 A CN 201910263935A CN 109738197 B CN109738197 B CN 109738197B
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Abstract
Gas angle setting unit is taken the present invention provides one kind and takes gas angle determination method, taking gas angle setting unit includes testing stand and exhaust pipe structure (1), the exhaust pipe structure (1) includes that exhaust manifold (1-1) and EGR take tracheae (1-3), the EGR takes one end of tracheae (1-3) and the position taken in gas junction of the exhaust manifold (1-1) to be provided with spherical interconnecting piece, another position is provided with the link slot with the spherical interconnecting piece rotation connection；The testing stand includes the first EGR flow meter (3) for providing the inlet duct of air inlet to the exhaust pipe structure (1) and taking the EGR flow of tracheae (1-3) for detecting the EGR.It is provided by the invention to take gas angle setting unit, it can determine that best EGR takes tracheae angle by any adjusting for taking air horn degree of exhaust pipe structure, realize the reasonable utilization of exhaust gas.
Description
Technical field
The present invention relates to engine apparatus technical field, in particular to one kind takes gas angle setting unit and takes air horn degree true
Determine method
Background technique
As engine emission regulation is increasingly stringenter, EGR(Exhaust Gas Recirculation, exhaust gas recycling
Technology) also become commonly used one of the technology of current engine.EGR technology can be divided into low pressure EGR technology and high pressure EGR skill
Art.Low pressure EGR technology, since EGR line takes gas on rear side of the whirlpool of turbine, when the output of engine large torque, engine
The pressure of air inlet pipe is much higher than the exhaust pipe pressure of engine, the influence of pressure difference, and exhaust gas spontaneous cannot be introduced from exhaust pipe
To air inlet pipe, to cannot achieve EGR rate, or even reflux can be generated.And high pressure EGR technology can avoid above situation.High pressure EGR
Technology is that exhaust gas is taken before engine supercharger turbine, i.e., gas is taken before whirlpool, exhaust gas is by components such as cooler for recycled exhaust gas and EGR valves
Engine air inlet tube is returned to, is mixed with air.Therefore, it is necessary to which EGR is arranged on exhaust manifold to take tracheae, it is made to form exhaust pipe
Structure.
EGR rate is defined as the EGR flow of recycling and sucks the ratio between the air inlet total amount of cylinder, and the reasonable control of EGR rate
System directly affects the performance and pollutant emission of engine.So the control of EGR rate is also just at control engine pollutant
The key of discharge.If the EGR on exhaust pipe structure takes tracheae angle, (angle that EGR takes tracheae relative to exhaust manifold) does not conform to
Suitable, exhaust energy enters EGR pipe too much, and EGR rate is more than target EGR value, but the energy for pushing turbine to do work just drops
It is low, cause engine consumption to be deteriorated.Conversely, EGR rate is not (being less than target EGR value) up to standard, then cause engine emission exceeded.
It therefore, it is necessary to balance energy before EGR rate and whirlpool, needs to make EGR rate close or equal to target EGR value, thus meeting discharge
Under the premise of, there is lower oil consumption.But since the form of exhaust pipe structure is more, EGR pipe is taken between air horn degree and EGR rate
Relationship is indefinite, air horn degree can not be taken to obtain target EGR rate according to fixed EGR pipe, influence the reasonable utilization of exhaust gas.
Therefore, the reasonable utilization of exhaust gas how is realized, it has also become those skilled in the art's urgent problem to be solved.
Summary of the invention
In view of this, the present invention provides one kind to take gas angle setting unit, to realize the reasonable utilization of exhaust gas.The present invention
It additionally provides one kind and takes gas angle determination method.
One kind taking gas angle setting unit, including testing stand and exhaust pipe structure, and the exhaust pipe structure includes exhaust discrimination
Pipe and EGR take tracheae, and the EGR takes one end of tracheae and the position of the exhaust manifold taken in gas junction to be provided with
Spherical interconnecting piece, another position are provided with the link slot with the spherical interconnecting piece rotation connection；
The testing stand includes providing the inlet duct of air inlet to the exhaust pipe structure and taking gas for detecting the EGR
First EGR flow meter of the EGR flow of pipe.
Preferably, above-mentioned to take in gas angle setting unit, the exhaust pipe structure further includes clamp nut；
The outer wall of the link slot has the external screw thread matched with the internal screw thread of the clamp nut, the clamp nut
The spherical interconnecting piece is limited to be detached from by the link slot.
Preferably, above-mentioned to take in gas angle setting unit, the testing stand further include:
The outlet mouth structure that multiple air inlets for the exhaust manifold connect one to one, the outlet mouth structure
It is connect with the outlet end of the inlet duct；
Shaped experiment table, the gas outlet structure setting is on the shaped experiment table；
For controlling the switch valve of the outlet mouth structure on-off.
Preferably, above-mentioned to take in gas angle setting unit, the outlet mouth structure is movably arranged at the experimental bench
On table.
Preferably, above-mentioned to take in gas angle setting unit, it is provided on the shaped experiment table and is tied along multiple gas outlets
The through-hole structure that the orientation of structure extends, the through-hole structure, which extends along, has cascaded surface, institute on two hole walls in direction
Cascaded surface is stated towards the exhaust pipe structure；
The outlet mouth structure, which has, positions the bulge-structure contacted with the cascaded surface.
Preferably, above-mentioned to take in gas angle setting unit, the testing stand further includes connecting plate, is had on the connecting plate
Connect the connecting hole of the air inlet of the exhaust manifold and the outlet side of the outlet mouth structure；
The connecting plate is detachably connected with the shaped experiment table.
Preferably, above-mentioned to take in gas angle setting unit, the connecting plate is moveably secured on the shaped experiment table；
The moving direction of the connecting plate is identical as the extending direction of the through-hole structure.
Preferably, above-mentioned to take in gas angle setting unit, it further include the EGR for being connected to the other end that the EGR takes tracheae
Connecting tube；
The first EGR flow meter is fixed on the EGR flow on the shaped experiment table and in the detection EGR connecting tube.
Preferably, above-mentioned to take in gas angle setting unit, the EGR connecting tube is hose.
Preferably, above-mentioned to take in gas angle setting unit, the testing stand further include:
The connecting box being connect with the gas outlet of the inlet duct；
Multiple gas outlet connecting tubes, one end of the gas outlet connecting tube connect one to one with the outlet mouth structure,
The other end of the gas outlet connecting tube is connect with the connecting box, and the switch valve is set in the gas outlet connecting tube.
Preferably, above-mentioned to take in gas angle setting unit, the gas outlet connecting tube is hose.
Preferably, above-mentioned to take in gas angle setting unit, the outlet mouth structure is tapered configuration；
The big end of the outlet mouth structure be for being connect with the air inlet of the exhaust manifold, the outlet mouth structure
Small end is connect with the gas outlet connecting tube.
It is preferably, above-mentioned to take in gas angle setting unit, further includes:
For detecting the second EGR flow meter of the air inlet total amount of the inlet duct；
For adjusting the air inflow adjusting device of the air inflow of the inlet duct.
Preferably, above-mentioned to take in gas angle setting unit, the testing stand further include:
Connect the exhaust connection of the inlet duct Yu the exhaust pipe structure；
It is series at the first stable-pressure device and the second stable-pressure device of the exhaust connection, the second EGR flow meter is set
It is placed between first stable-pressure device and second stable-pressure device.
Preferably, above-mentioned to take in gas angle setting unit, further includes: with the air inflow adjusting device, the first EGR
Flowmeter and the second EGR flow meter communication connection, for controlling the Acquisition Instrument of signal input and output；
It is communicated to connect with the Acquisition Instrument, for monitoring and adjusting the computing unit of piping flow.
Preferably, above-mentioned to take in gas angle setting unit, it further include the admission pressure for detecting the inlet duct
Pressure value detection device；
The Acquisition Instrument and the pressure value detection device communicate to connect, the computing unit can be used in monitoring it is described into
Atmospheric pressure.
Preferably, above-mentioned to take in gas angle setting unit, the inlet duct includes blower and the driving fan operation
Motor；
The air inflow adjusting device is the frequency converter for controlling the motor speed.
The present invention also provides one kind to take gas angle determination method, takes air horn degree to determine using as described in any one of the above embodiments
Device, comprising:
1) target EGR rate is determined, to the inlet charge of exhaust manifold；
2) EGR flow value is detected, EGR is adjusted and takes tracheae angle and detect the flow that EGR takes tracheae, obtain EGR and take tracheae
Total EGR flow value；
3) by total EGR flow value compared with the target EGR flow value obtained according to target EGR rate, or, will be according to total EGR
The EGR rate that flow value obtains is compared with the target EGR rate；
4) it when comparison result is unsatisfactory for demand, enters step 2)；When comparison result meet demand, output EGR takes tracheae
Angle.
Preferably, above-mentioned to take in gas angle determination method, in the step 1), the single air inlet of Xiang Suoshu exhaust manifold
Air inlet；In the step 2, the EGR takes the EGR flow of tracheae, total EGR flow when detecting the single inlet charge
The EGR flow summation that magnitude detects when being whole inlet charges.
Preferably, above-mentioned to take in gas angle determination method, described to take gas angle setting unit further include for detecting air inlet
The pressure value detection device of the admission pressure of device；
In the step 2, to pressure value detection device institute measuring pressure value stabilization and then start to detect EGR flow
Value.
It can be seen from the above technical scheme that provided by the invention take gas angle setting unit, since EGR takes tracheae
One end and the position of exhaust manifold taken in gas junction are provided with spherical interconnecting piece, another position is provided with and spherical shape
The link slot of interconnecting piece rotation connection, so that link slot and spherical interconnecting piece form the structure of universal joint.That is, EGR takes tracheae
It is connect with exhaust manifold by the structure of universal joint, in order to which allow exhaust pipe structure takes air horn degree arbitrarily to adjust,
In order to take adjusting of the tracheae relative to exhaust manifold by EGR, realize that EGR takes the adjusting of tracheae angle.The air inlet of testing stand
Device provides air inlet to exhaust pipe structure, is examined in the adjustment process that EGR takes tracheae angle by the first EGR flow meter
It surveys, obtains and flow through the EGR flow that EGR takes tracheae, and the EGR flow that the detection obtains is compared with target EGR flow.
When the EGR flow that detection obtains is closest or equal with target EGR flow, then EGR at this time takes tracheae angle to be in best
EGR takes tracheae angle.It is provided by the invention to take gas angle setting unit, any of air horn degree can be taken by exhaust pipe structure
It adjusts, in order to which the EGR flow and target EGR flow that will test in adjustment process compare, and then determines that best EGR takes
Tracheae angle realizes the reasonable utilization of exhaust gas.
The present invention also provides one kind to take gas angle determination method, takes gas angle setting unit to have above-mentioned skill due to above-mentioned
There is the above-mentioned engine for taking gas angle setting unit should also have similarly technical effect, no longer tire out one by one herein for art effect
It states.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the flow diagram provided by the invention for taking gas angle setting unit；
Fig. 2 is the structural schematic diagram provided by the invention for taking gas angle setting unit；
Fig. 3 is the partial schematic diagram provided by the invention for taking gas angle setting unit；
Fig. 4 is the partial sectional view provided by the invention for taking gas angle setting unit；
Fig. 5 is the first extreme position schematic diagram of exhaust pipe structure provided by the invention；
Fig. 6 is the second extreme position schematic diagram of exhaust pipe structure provided by the invention.
Specific embodiment
The invention discloses one kind to take gas angle setting unit, to realize the reasonable utilization of exhaust gas.The present invention also provides
One kind taking gas angle determination method.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1-Fig. 6 is please referred to, the embodiment of the invention provides one kind to take gas angle setting unit, including testing stand and exhaust
Pipe structure 1, exhaust pipe structure 1 include that exhaust manifold 1-1 and EGR take tracheae 1-3, EGR to take one end and the exhaust manifold of tracheae 1-3
The position of 1-1 taken in gas junction is provided with spherical interconnecting piece, another position is provided with to be rotated with spherical interconnecting piece
The link slot of connection；Testing stand includes providing the inlet duct of air inlet to exhaust pipe structure 1 and taking tracheae 1-3 for detecting EGR
EGR flow the first EGR flow meter 3.
It is provided in an embodiment of the present invention to take gas angle setting unit, since EGR takes one end and the exhaust manifold 1- of tracheae 1-3
1 position taken in gas junction is provided with spherical interconnecting piece, another position is provided with to be connected with spherical interconnecting piece rotation
The link slot connect, so that link slot and spherical interconnecting piece form the structure of universal joint.That is, EGR takes tracheae 1-3 and exhaust manifold
1-1 is connected by the structure of universal joint, in order to which allow exhaust pipe structure 1 takes air horn degree arbitrarily to adjust, in order to
It takes tracheae 1-3 relative to the adjusting of exhaust manifold 1-1 by EGR, realizes that EGR takes the adjusting of tracheae angle.The air inlet of testing stand
Device provides air inlet to exhaust pipe structure 1, is examined in the adjustment process that EGR takes tracheae angle by the first EGR flow meter 3
It surveys, obtains and flow through the EGR flow that EGR takes tracheae 1-3, and the EGR flow that the detection is obtained and target EGR flow carry out pair
Than.When the EGR flow that detection obtains is closest or equal with target EGR flow, then EGR at this time takes tracheae angle to be in most
Good EGR takes tracheae angle.It is provided in an embodiment of the present invention to take gas angle setting unit, gas can be taken by exhaust pipe structure 1
Any adjusting of angle, in order to which the EGR flow and target EGR flow that will test in adjustment process compare, and then really
Fixed best EGR takes tracheae angle, realizes the reasonable utilization of exhaust gas.
It is understood that spherical interconnecting piece and link slot are rotatablely connected, fit structure meets sealing requirements.Fig. 5
And Fig. 6 is extreme position angle, EGR takes tracheae 1-3 relative to the angle of exhaust manifold 1-1 it can be seen from Fig. 5 and Fig. 6
It is adjustable.Fig. 5 is the schematic diagram that EGR takes tracheae 1-3 and exhaust manifold 1-1 in greatest limit angle；Fig. 6 is that EGR takes tracheae
1-3 and exhaust manifold 1-1 is in the schematic diagram of least limit angle.
Preferably, exhaust pipe structure further includes clamp nut 1-2；The outer wall of link slot have in clamp nut 1-2
The external screw thread that screw thread matches, clamp nut 1-2, which has, limits the through-hole that spherical interconnecting piece is detached from by link slot.It is pressed by setting
Both tight nut 1-2 effectively increases EGR and takes tracheae 1-3 relative to the stability in exhaust manifold 1-1 adjustment process, avoid
Separation.
In the present embodiment, link slot is provided on exhaust manifold 1-1, EGR, which takes, is provided with spherical interconnecting piece on tracheae 1-3.
Wherein, sealing ring is provided between clamp nut 1-2 and exhaust manifold 1-1.
In the present embodiment, testing stand further include: what multiple air inlets for exhaust manifold 1-1 connected one to one goes out
Port configurations 5, outlet mouth structure 5 are connect with the outlet end of inlet duct；Shaped experiment table 4, outlet mouth structure 5 are set to experimental bench
On table 4.For controlling the switch valve 15 of 5 on-off of outlet mouth structure.By above-mentioned setting, in order to realize to individual exhaust discrimination
The adjusting of the inlet charge of pipe 1-1.Inlet duct is preferably blower 13.
Therefore, in the actual operation process, target EGR rate, target excess air coefficient lambda, target rate of fuel consumption are defined
BSFC, target power P.Following formula is needed to be derived.
Target EGR rate calculation formula:
(1)
In formula,For target EGR rate；
For EGR quality；
For air quality.
Fuel oil quality can be calculated by target rate of fuel consumption and target power and be obtained:
(2)
In formula,For fuel oil quality.
And air quality and fuel oil quality are in following relationship:
(3)
So air inlet gross mass is the sum of air quality and fuel oil quality.When test, each air inlet of exhaust manifold according to
Secondary air inlet, and air mass is equal:
(4)
In formula, n-cylinder number.
So matter is flowed out in gas outlet of the air mass that the air inlet of exhaust manifold 1-1 is flowed into equal to exhaust manifold 1-1
Amount flows out quality sum with EGR air hatch:
(5)
Wherein,When for the n-th inlet charge, the mass flow that EGR takes tracheae is flowed through；For the n-th air inlet
When mouth air inlet, the mass flow of the gas outlet exhaust manifold 1-1.
By taking four-cylinder as an example, as shown in Figures 4 and 5, testing stand is built, realizes the air inlet to single exhaust manifold 1-1
Carry out air inlet.Air inlet on exhaust manifold 1-1 is the first air inlet 1-1-1, the second air inlet 1-1-2, third air inlet 1-
1-3 and the 4th air inlet 1-1-4.A certain operating condition is set, total air-mass flow as obtained by the above-mentioned calculation formula calculating of formula, input foundation is provided for measurement.The exhaust after burning is replaced with air, EGR is defined and takes tracheae 1-3 and exhaust manifold 1-1
Angle is θ (EGR takes tracheae angle).Mono- value of θ given first, the first air inlet 1-1-1 air inlet first, air-mass flow are, other air inlets are in off state.After steady air current, flowed through using flowmeter measurement
EGR takes the mass flow of tracheae.Then the second air inlet 1-1-2 air inlet, air-mass flow, other inlet closes.Equally after steady air current, measurement flows through EGR and takes tracheae
Mass flow.And so on, it completesWithMeasurement, will、、AndThe total EGR quality flow surveyed is obtained after accumulation summation, by itself and target EGR quality flow
It compares, judges whether θ is suitable.
Also six cylinder machines be can be applied to, it is, of course, also possible to suitable for the engine of other cylinder numbers.Above-mentioned first air inlet
1-1-1, the second air inlet 1-1-2, third air inlet 1-1-3 and the 4th air inlet 1-1-4, the air inlet for not limiting air inlet are suitable
Sequence, can also be first to the 4th air inlet 1-1-4 or third air inlet 1-1-3 air inlet.
To sum up, using the above method, θ value is constantly adjusted, until surveying total EGR quality in the unit time under a certain θ value
FlowWith target EGR quality flowEqual, then the EGR takes the EGR flow detected under tracheae angle
Amount is closest or equal with target EGR flow, determines that θ value is best at this time, i.e., EGR at this time takes tracheae 1-3 and exhaust manifold 1-1
Angle (EGR takes tracheae angle) be best EGR take air horn degree, at this time exhaust system meet demarcate EGR rate under the premise of, whirlpool
Preceding energy reaches maximum value, realizes the reasonable utilization of exhaust gas.
Wherein, above-mentioned mass flow refers to that fluid passes through closed conduct or the fluid of open channel effective cross-section in the unit time
Amount.
It is of course also possible to make the air inlet air inlet simultaneously of exhaust manifold 1-1, what the first EGR flow meter 3 detection at this time obtained
Numerical value is total EGR quality flow that EGR takes tracheae 1-3.
In order to improve versatility, outlet mouth structure 5 is movably arranged on shaped experiment table 4.It, can be with by above-mentioned setting
According to the adjusting of 5 position of outlet mouth structure, the connection of the exhaust manifold 1-1 suitable for different cylinder centre line spacings, in order to different rows
Air pipe structure 1 is detected.
As shown in Figures 4 and 5, the through-hole of the orientation extension along multiple outlet mouth structures 5 is provided on shaped experiment table 4
Structure 4-1, through-hole structure 4-1, which are extended along, has cascaded surface on two hole walls in direction, cascaded surface is towards exhaust pipe structure 1；
Outlet mouth structure 5, which has, positions the bulge-structure contacted with cascaded surface.By above-mentioned setting, outlet mouth structure 5 is slided
It is set in through-hole structure 4-1 dynamicly.
In the present embodiment, in the considerations of facilitating connection and improving sealing effect, testing stand further includes connecting plate 16, connection
There is the connecting hole of the air inlet of connection exhaust manifold 1-1 and the outlet side of outlet mouth structure 5 on plate 16；Connecting plate 16 and experiment
Table 4 is detachably connected.It should be noted that connecting plate 16 needs to set from the exhaust manifold 1-1 of different cylinder centre line spacings one-to-one correspondence
It sets.In turn, the air inlet of exhaust manifold 1-1 and the outlet of outlet mouth structure 5 can be realized by replacing different connecting plates 16
The connection at end.
Preferably, the outlet side of outlet mouth structure 5 is provided with seal groove structure, when connecting plate 16 is pressed onto test table 4 simultaneously
After being firmly connected with it, the connecting hole of outlet side and connecting plate 16 that outlet mouth structure 5 may be implemented reliably is sealed.
Further, in order to reduce mobile limitation of the outlet mouth structure 5 relative to shaped experiment table 4, connecting plate 16 is removable
Ground is fixed on shaped experiment table 4；The moving direction of connecting plate 16 is identical as the extending direction of through-hole structure 4-1.As shown in figure 3,
Strip-shaped hole is provided on shaped experiment table 4, the extending direction of strip-shaped hole is identical as the extending direction of through-hole structure 4-1, connecting plate 16
It is installed in strip-shaped hole by bolt, therefore, connecting plate 16 can be moved along the extending direction for being identical to through-hole structure 4-1.
It is provided in this embodiment to take in gas angle setting unit, it further include the other end for being connected to EGR and taking tracheae 1-3
EGR connecting tube 2；First EGR flow meter 3 is fixed on shaped experiment table 4 and detects the EGR flow in EGR connecting tube 2.By upper
Setting is stated, facilitates and the first EGR flow meter 3 is fixed on shaped experiment table 4, and then ensure the structure for taking gas angle setting unit
Stability.
The angular adjustment of tracheae 1-3 is taken for the ease of EGR, EGR connecting tube 2 is hose.
Further, testing stand further include: connecting box 21 and multiple gas outlet connecting tubes 6, connecting box 21 and air inlet fill
The gas outlet connection set；One end of gas outlet connecting tube 6 connects one to one with outlet mouth structure 5, gas outlet connecting tube 6 it is another
One end is connect with connecting box 21.Wherein, switch valve 15 is set in gas outlet connecting tube 6.Pass through above-mentioned setting, it is only necessary to use one
A inlet duct can carry out conveying gas to multiple outlet mouth structures 5.
Preferably, switch valve 15 is ball valve.
For the ease of the adjusting of 5 position of outlet mouth structure, gas outlet connecting tube 6 is hose.Preferably, gas outlet connecting tube
6 be plasticity bellows.
In the present embodiment, outlet mouth structure 5 is tapered configuration；The big end of outlet mouth structure 5 be for exhaust manifold 1-1
Air inlet connection, the small end of outlet mouth structure 5 connect with gas outlet connecting tube 6.It is understood that outlet mouth structure 5 is gradually
Pipeline size after contracting is identical, that is, the size of multiple gas outlet connecting tubes 6 is identical.By above-mentioned setting, facilitate control gas outlet
The big end outlet section of structure 5, in order to be adapted to from different exhaust pipe structures.The big end outlet section of outlet mouth structure 5 can be with
For rectangle, round or ellipse etc..
For the ease of adjust inlet duct air-entry value, take gas angle setting unit further include the second EGR flow meter 8 and into
Air volume regulating device 19.Second EGR flow meter 8 is used to detect the air inlet total amount of inlet duct；Air inflow adjusting device 19 is used for
Adjust the air inflow of inlet duct.
If actual flow is less than target flow, frequency converter frequency value is automatically with the increase of preset step-length, until real
Border flow is equal to target flow, and frequency converter frequency is fixed at this time.Conversely, when actual flow is greater than target flow, frequency converter frequency
Value is automatically with the reduction of preset step-length, until actual flow is equal to target flow, frequency converter frequency is fixed at this time.
In the present embodiment, testing stand further include: the exhaust connection 10 of connection inlet duct and exhaust pipe structure 1；For
Detect the second EGR flow meter 8 of the air inlet total amount of inlet duct；It is series at the first stable-pressure device 9 and of exhaust connection 10
Two stable-pressure devices 7, the second EGR flow meter 8 are set between the first stable-pressure device 9 and the second stable-pressure device 7.Wherein, when second
After EGR flow meter 8 is stablized, the first EGR flow meter 3 starts to detect, and can effectively improve detected value.
Second EGR flow meter 8 is preferably connect by flange bolt with the second stable-pressure device 7 and the first stable-pressure device 9.
In the present embodiment, the second stable-pressure device 7 is an integral structure with connecting box 21.Then pressure stabilizing barrel structure is formed.
Preferably, taking gas angle setting unit further includes Acquisition Instrument 17 and computing unit 18.Acquisition Instrument 17 and air inflow tune
Regulating device 19, the first EGR flow meter 3 and the communication connection of the second EGR flow meter 8, for controlling signal input and output；It calculates single
Member 18 is communicated to connect with Acquisition Instrument 17, for monitoring and adjusting piping flow.That is, by control air inflow adjusting device 19 into
The adjusting of the air inflow of device of air controls the flow in exhaust connection 10, and the flow in exhaust connection 10 is by the second EGR flow
The detection of meter 8 obtains.
The considerations of for factors such as safety further includes the pressure value detection device for detecting the admission pressure of inlet duct
20；Acquisition Instrument 17 and pressure value detection device 20 communicate to connect, and computing unit 18 can be used in monitoring admission pressure.
In the present embodiment, inlet duct includes the motor 12 that blower 13 and driving blower 13 are run；Air inflow adjusting device
19 be the frequency converter for controlling 12 revolving speed of motor.That is, by the revolving speed of fan blade in control blower 13, to control inlet duct to row
The air inflow that air pipe structure 1 conveys.It is of course also possible to be set as other kinds of inlet duct.That is, blower 13 be it is above-mentioned into
Device of air.
Inlet duct further includes pedestal 11, and blower 13 and motor 12 are both secured on pedestal 11.
Preferably, above-mentioned connecting tube (EGR connecting tube 2, gas outlet connecting tube 6 and exhaust connection 10) preferably passes through clip
Or circlip is connect with component, in order to ensure sealing performance.
The present embodiment additionally provides one kind and takes gas angle determination method, using such as it is above-mentioned it is any take air horn degree determine dress
It sets, comprising:
S1: determining target EGR rate, to the inlet charge of exhaust manifold 1-1；
S2: detection EGR flow value adjusts EGR and takes tracheae angle and detect the flow that EGR takes tracheae 1-3, obtains EGR and take
Total EGR flow value of tracheae 1-3；
S3: by total EGR flow value compared with the target EGR flow value obtained according to target EGR rate, or, will be according to total EGR
The EGR rate that flow value obtains is compared with the target EGR rate；
S4: when comparison result is unsatisfactory for demand, 2 are entered step；When comparison result meet demand, output EGR takes tracheae
Angle.
It is provided by the invention to take gas angle determination method, have and takes the identical technology of gas angle setting unit to imitate with above-mentioned
Fruit is no longer tired in detail herein to state.Wherein, above-mentioned flow value can be mass flow, or volume flow, according to volume flow
The product of amount and fluid density obtains mass flow.
In the present embodiment, by total EGR flow value compared with the target EGR flow value obtained according to target EGR rate, work as unit
Total EGR flow value (total mass flow rate is surveyed in time) and target EGR flow value (target EGR quality flow) it is equal or closest to when, comparison result meet demand.
By the EGR rate obtained according to total EGR flow value compared with target EGR rate, total EGR flow is surveyed when working as in the unit time
Magnitude (total mass flow rate) EGR rate is converted into according to EGR rate calculation formula, and compared with target EGR rate, when two
Person it is equal or closest to when, comparison result meet demand.
Further, in the step S1, to the single inlet charge of exhaust manifold；In step S2, detection individually into
EGR takes the EGR flow of tracheae 1-3 when port air inlet, total EGR flow value all the inlet charge when detect to obtain
EGR flow summation.Wherein, in the present embodiment, aforesaid operations are completed by the on-off of switch valve 15.Also multiple air inlets can be set
Device is arranged in a one-to-one correspondence the air inlet of itself and exhaust manifold 1-1, by starting corresponding inlet duct, to exhaust manifold
The air inlet of 1-1 carries out gas conveying.
Further, taking gas angle setting unit further includes the pressure value detection for detecting the admission pressure of inlet duct
Device 20.It is provided in this embodiment to take in gas angle determination method, in step s 2, to 20 measuring pressures of pressure value detection device
Value is stablized and then starts to detect EGR flow value.The preferred pressure sensor of pressure value detection device 20.
Gas angle setting unit is taken to be described in detail to provided by the invention above.Specific case used herein
Principle and implementation of the present invention are described, the above embodiments are only used to help understand side of the invention
Method and its core concept.It should be pointed out that for those skilled in the art, not departing from the principle of the invention
Under the premise of, it can be with several improvements and modifications are made to the present invention, these improvement and modification also fall into the claims in the present invention
In protection scope.
Claims (17)
1. one kind takes gas angle setting unit, including testing stand and exhaust pipe structure (1), which is characterized in that the exhaust pipe knot
Structure (1) includes that exhaust manifold (1-1) and EGR take tracheae (1-3), and the EGR takes one end of tracheae (1-3) and the exhaust manifold
The position taken in gas junction of (1-1) is provided with spherical interconnecting piece, another position is provided with to be connect with the spherical shape
The link slot of portion's rotation connection；
The testing stand includes: to provide the inlet duct of air inlet to the exhaust pipe structure (1)；Gas is taken for detecting the EGR
Manage the first EGR flow meter (3) of the EGR flow of (1-3)；Multiple one a pair of air inlet for the exhaust manifold (1-1)
The outlet mouth structure (5) that should be connected, the outlet mouth structure (5) connect with the outlet end of the inlet duct；Shaped experiment table
(4), the outlet mouth structure (5) is set on the shaped experiment table (4)；For controlling outlet mouth structure (5) on-off
Switch valve (15)；The connecting box (21) being connect with the gas outlet of the inlet duct；Multiple gas outlet connecting tubes (6), it is described go out
One end of port connecting tube (6) connects one to one with the outlet mouth structure (5), the gas outlet connecting tube (6) it is another
End is connect with the connecting box (21), and the switch valve (15) is set on the gas outlet connecting tube (6)；
The outlet mouth structure (5) is tapered configuration；The big end of the outlet mouth structure (5) be for the exhaust manifold
The air inlet of (1-1) connects, and the small end of the outlet mouth structure (5) is connect with the gas outlet connecting tube (6).
2. according to claim 1 take gas angle setting unit, which is characterized in that the exhaust pipe structure further includes compressing
Nut (1-2)；
The outer wall of the link slot has the external screw thread matched with the internal screw thread of the clamp nut (1-2), the compression spiral shell
Female (1-2) limitation spherical interconnecting piece is detached from by the link slot.
3. according to claim 1 take gas angle setting unit, which is characterized in that the outlet mouth structure (5) is removable
Ground is set on the shaped experiment table (4).
4. according to claim 3 take gas angle setting unit, which is characterized in that be provided on the shaped experiment table (4)
The through-hole structure (4-1) that orientation along multiple outlet mouth structures (5) extends, the through-hole structure (4-1) are prolonged along it
Stretching has cascaded surface on two hole walls in direction, the cascaded surface is towards the exhaust pipe structure (1)；
The outlet mouth structure (5), which has, positions the bulge-structure contacted with the cascaded surface.
5. according to claim 4 take gas angle setting unit, which is characterized in that the testing stand further includes connecting plate
(16), there is going out for the air inlet and the outlet mouth structure (5) that connect the exhaust manifold (1-1) on the connecting plate (16)
The connecting hole at gas end；
The connecting plate (16) is detachably connected with the shaped experiment table (4).
6. according to claim 5 take gas angle setting unit, which is characterized in that the connecting plate (16) is movably solid
Due on the shaped experiment table (4)；
The moving direction of the connecting plate (16) is identical as the extending direction of the through-hole structure (4-1).
7. according to claim 1 take gas angle setting unit, which is characterized in that further include being connected to the EGR to take gas
Manage the EGR connecting tube (2) of the other end of (1-3)；
The first EGR flow meter (3) is fixed on the EGR on the shaped experiment table (4) and in the detection EGR connecting tube (2)
Flow.
8. according to claim 7 take gas angle setting unit, which is characterized in that the EGR connecting tube (2) is hose.
9. according to claim 1 take gas angle setting unit, which is characterized in that the gas outlet connecting tube (6) is soft
Pipe.
10. -9 described in any item taking gas angle setting unit according to claim 1, which is characterized in that further include:
For detecting the second EGR flow meter (8) of the air inlet total amount of the inlet duct；
For adjusting the air inflow adjusting device (19) of the air inflow of the inlet duct.
11. according to claim 10 take gas angle setting unit, which is characterized in that the testing stand further include:
Connect the exhaust connection (10) of the inlet duct Yu the exhaust pipe structure (1)；
The first stable-pressure device (9) and the second stable-pressure device (7) being series on the exhaust connection (10), the 2nd EGR
Flowmeter (8) is set between first stable-pressure device (9) and second stable-pressure device (7).
12. according to claim 10 take gas angle setting unit, which is characterized in that further include: with the air inflow tune
Regulating device (19), the first EGR flow meter (3) and the second EGR flow meter (8) communication connection, it is defeated for controlling signal
The Acquisition Instrument (17) for entering and exporting；
It is communicated to connect with the Acquisition Instrument (17), for monitoring and adjusting the computing unit (18) of piping flow.
13. according to claim 12 take gas angle setting unit, which is characterized in that further include for detect it is described into
The pressure value detection device (20) of the admission pressure of device of air；
The Acquisition Instrument (17) and the pressure value detection device (20) communicate to connect, and the computing unit (18) can be used in supervising
Control the admission pressure.
14. according to claim 10 take gas angle setting unit, which is characterized in that the inlet duct includes blower
(13) and the motor (12) of the driving blower (13) operation；
The air inflow adjusting device (19) is the frequency converter for controlling motor (12) revolving speed.
15. one kind takes gas angle determination method, which is characterized in that application takes air horn degree as claim 1-14 is described in any item
Determining device, comprising:
1) target EGR rate is determined, to the inlet charge of exhaust manifold (1-1)；
2) EGR flow value is detected, EGR is adjusted and takes tracheae angle and detect the flow that EGR takes tracheae (1-3), obtain EGR and take tracheae
Total EGR flow value of (1-3)；
3) by total EGR flow value compared with the target EGR flow value obtained according to target EGR rate, or, will be according to total EGR flow
The EGR rate that value obtains is compared with the target EGR rate；
4) it when comparison result is unsatisfactory for demand, enters step 2)；When comparison result meet demand, output EGR takes tracheae angle.
16. according to claim 15 take gas angle determination method, which is characterized in that in the step 1), to the row
The single inlet charge of gas manifold (1-1)；In the step 2, the EGR takes gas when detecting the single inlet charge
Manage the EGR flow of (1-3), the EGR flow summation that total EGR flow value detects when being whole inlet charges.
17. according to claim 15 or 16 take gas angle determination method, which is characterized in that described that air horn degree is taken to determine dress
Setting further includes pressure value detection device (20) for detecting the admission pressure of inlet duct；
In the step 2, to pressure value detection device (20) institute measuring pressure value stabilization and then start to detect EGR flow
Value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910263935.1A CN109738197B (en) | 2019-04-03 | 2019-04-03 | It takes gas angle setting unit and takes gas angle determination method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910263935.1A CN109738197B (en) | 2019-04-03 | 2019-04-03 | It takes gas angle setting unit and takes gas angle determination method |
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