CN105606764B - The measuring method and device of engine EGR waste gas mixture homogeneity - Google Patents
The measuring method and device of engine EGR waste gas mixture homogeneity Download PDFInfo
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- CN105606764B CN105606764B CN201510780077.XA CN201510780077A CN105606764B CN 105606764 B CN105606764 B CN 105606764B CN 201510780077 A CN201510780077 A CN 201510780077A CN 105606764 B CN105606764 B CN 105606764B
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Abstract
The invention discloses a kind of measuring method and device of engine EGR waste gas mixture homogeneity.The measuring method comprises the following steps：First, multiple measuring points of the inlet manifold porch of gas handling system and the gas concentration lwevel of the cylinder porch of multiple inlet manifold are measured respectively；Secondly, EGR rate is calculated according to the carbon dioxide concentration measured, the EGR rate is equal to the ratio of the gas concentration lwevel and exhaust gas concentration lwevel that measure；Again, the EGR exhaust uniformity of each measuring point in inlet manifold porch and the EGR exhaust uniformity of the cylinder porch of each inlet manifold are calculated.The measuring method of the engine EGR waste gas mixture homogeneity is by measuring concentration of the carbon dioxide in any section of gas handling system of EGR exhaust, its mixture homogeneity is calculated in the concentration of each opening position according to carbon dioxide, according to the mixture homogeneity of each opening position and diversity judgement blender mixing uniformity.
Description
Technical field
The present invention relates to engine EGR detection field, more particularly to a kind of measurement of engine EGR waste gas mixture homogeneity
Method and device.
Background technology
The noxious emission of engine is to cause one of important sources of atmosphere pollution, and its main exhaust pollutant is nitrogen oxygen
Compound, hydrocarbons and carbon monoxide, with increasing for vehicle, exhaust contaminant aggravates to the pollution level of air, therefore state
Limitation of the family to motor exhaust pollutant discharge amount is increasingly severe.Gas engine on sale at present is satisfied by the exhaust method of state five
The technical requirements of rule, it is increasingly severe with engine emission regulation, exploitation meet the gas engine of the Abgasgesetz of state six into
The task of top priority, the Abgasgesetz of state six are limited more NOx in tail gas (nitrogen oxides) discharge capacity relative to the Abgasgesetz of state five
Strictly, the burn technology path of+EGR (gas recirculation system)+post processing of equivalent is used further to reduce NOx discharge with full
The sufficient emission regulation demands of state six.A part of waste gas is caused gas handling system by EGR (gas recirculation system), is mixed with air and combustion gas
Enter cylinder combustion (fuel gas injection mode is single point injection, and combustion gas first mixes with air, then is mixed with EGR exhaust) after conjunction, by
Main component is the carbon dioxide and water of high specific heat capacity in waste gas, so as to reduce in-cylinder combustion temperature, enters NOx discharge
One step reduces (cylinder temperature reduces, and the chemical reaction rate for generating NOx is slack-off).
After adding waste gas in gas handling system, to each cylinder combustion stability of engine, detonation pressure and the warm uniformity of row have aobvious
Writing influences, it is therefore desirable to it is equal to measure waste gas and the mixed mixing of air fuel gas in gas handling system using a kind of apparatus and method
Evenness, to evaluate blender mixing uniformity, and foundation is provided to design, make burn cycle stability bandwidth, detonation pressure and row's temperature uneven
Evenness is controlled in rational scope.
After adding EGR exhaust in gas handling system, blender mixing uniformity can be had a certain impact, mainly passed through at present
The detonation pressure and instruction average pressure of each cylinder are gathered using Combustion tester, calculates detonation pressure and the instruction mean pressure of each cylinder
The power uniformity, spends evaluation blender mixing uniformity according to each cylinder, but its can only judge it is uniform between each cylinder of engine
Sex differernce, each cylinder combustion gas uniformity difference or EGR exhaust uniformity difference can not be isolated, can not be according to combustion gas and EGR
Waste gas mixture homogeneity comprehensive descision blender mixing uniformity, i.e., can not judge fuel gas mixer design it is unreasonable or
EGR mixer design is unreasonable.EGR exhaust and the device of the combustion gas mixing uniformity in a kind of measurement gas handling system of the present application
With method (device can not only measure EGR exhaust, can also measure gas component), EGR exhaust and air and combustion gas are judged
Mixture homogeneity (EGR exhaust and gas component volume content distribution consistency degree), is well mixed so as to evaluate blender after mixing
Property.
The information for being disclosed in the background section is merely intended to understanding of the increase to the general background of the present invention, without answering
It has been the prior art well known to persons skilled in the art when being considered as recognizing or implying the information structure in any form.
The content of the invention
It is an object of the invention to provide a kind of measurement side of the engine EGR waste gas mixture homogeneity of simple and reasonable steps
Method and device, the measuring method of the engine EGR waste gas mixture homogeneity is by measuring the carbon dioxide of EGR exhaust in air inlet system
Unite the concentration in any section, its mixture homogeneity is calculated in the concentration of each opening position according to carbon dioxide, according to each position
The mixture homogeneity and diversity judgement blender mixing uniformity at place.
To achieve the above object, according to an aspect of the invention, there is provided a kind of engine EGR waste gas mixture homogeneity
Measuring method and device, comprise the following steps：First, measure respectively gas handling system inlet manifold porch multiple measuring points and
The gas concentration lwevel of the cylinder porch of multiple inlet manifold；Secondly, EGR is calculated according to the carbon dioxide concentration measured
Rate, the EGR rate are equal to the ratio of the gas concentration lwevel and exhaust gas concentration lwevel that measure；Again, inlet manifold is calculated to enter
The EGR exhaust uniformity of the cylinder porch of the EGR exhaust uniformity of each measuring point and each inlet manifold at mouthful.
Preferably, in above-mentioned technical proposal, the EGR exhaust uniformity=1- of each measuring point of inlet manifold porch is (each
The average value of the EGR rate of individual measuring point-multiple measuring points EGR rate)/multiple measuring point EGR rates average value.
Preferably, in above-mentioned technical proposal, the EGR exhaust uniformity=1- of the cylinder porch of each inlet manifold is (each
The average value of the cylinder porch EGR rate of the EGR rate of the cylinder porch of individual inlet manifold-multiple inlet manifold)/multiple air inlets
The average value of the cylinder porch EGR rate of manifold.
According to another aspect of the present invention, there is provided a kind of measurement apparatus of engine EGR waste gas mixture homogeneity, bag
Include：Gauge head, it is separately positioned on gas handling system inlet manifold porch and the cylinder porch of multiple inlet manifold to be multiple
Each measuring point, for gathering the gaseous mixture of inlet manifold porch and multiple inlet manifold；Transfer tube, it includes：Connectivity port,
Intervalve and gas analyzer connectivity port, the connectivity port are corresponding with the gauge head multiple, and each connectivity port is equal
It is provided with the first switching switch；One end of the connectivity port is connected with the side of intervalve, and the other end is connected with the gauge head to be come
Gather the gaseous mixture of inlet manifold porch and multiple inlet manifold；The both ends sealing of the intervalve；The gas analyzer
One end of connectivity port connects with the side of intervalve；And gas analyzer, itself and the gas analyzer connectivity port
The other end connects.
Preferably, in above-mentioned technical proposal, gauge head is arranged on the inlet manifold porch by the way of threaded connection
With the cylinder porch of multiple inlet manifold.
Preferably, in above-mentioned technical proposal, the gauge head at gas manifold entrance is five.
Preferably, in above-mentioned technical proposal, the second switching switch is provided with gas analyzer connectivity port.
Compared with prior art, the present invention has the advantages that：The measurement of the engine EGR waste gas mixture homogeneity
Method is by measuring concentration of the carbon dioxide in any section of gas handling system of EGR exhaust, according to carbon dioxide in each position
The concentration at place calculates its mixture homogeneity, is well mixed according to the mixture homogeneity of each opening position and diversity judgement blender
Property.
Brief description of the drawings
Fig. 1 is the schematic diagram of the measurement apparatus of the engine EGR waste gas mixture homogeneity of the present invention.
Embodiment
Below in conjunction with the accompanying drawings, the embodiment of the present invention is described in detail, it is to be understood that the guarantor of the present invention
Shield scope is not limited by embodiment.
Explicitly indicated that unless otherwise other, otherwise in entire disclosure and claims, term " comprising " or its change
Change such as "comprising" or " including " etc. and will be understood to comprise stated element or part, and do not exclude other members
Part or other parts.
According to the specific steps bag of the measuring method of the engine EGR waste gas mixture homogeneity of the specific embodiment of the invention
Include：
First, the multiple measuring points of gas handling system inlet manifold porch and the cylinder of multiple inlet manifold measured respectively enter
Gas concentration lwevel at mouthful；
The gas handling system of engine includes：Air inlet pipe, fuel gas mixer, EGR mixer, air inlet tube, inlet manifold and
Inlet manifold, air enter gas handling system from air inlet pipe, respectively in fuel gas mixer, EGR mixer with combustion gas and EGR exhaust
Mixing, gaseous mixture is through air inlet tube, inlet manifold finally from multiple each cylinders of inlet manifold air inlet engine.
The gas concentration lwevel is gas concentration lwevel in gaseous mixture.Carry out the gas handling system of carbon dioxide concentration measurement
Section can select the cylinder porch in inlet manifold porch and multiple inlet manifold, be set in inlet manifold porch deep
Enter multiple measuring points of inlet manifold, the gaseous mixture of multiple measuring point collection inlet manifold porch, gas point is sent into through switching device
Analyzer measures the gas concentration lwevel of inlet manifold's entrance；In the cylinder porch of multiple inlet manifold, setting is goed deep into multiple respectively
The measuring point of inlet manifold, each manifold arrange that a measuring point gathers the gaseous mixture of each manifold respectively, and gas is sent into through switching device
Body analyzer measures the gas concentration lwevel of the cylinder porch of multiple inlet manifold.
Secondly, EGR rate is calculated according to the carbon dioxide concentration measured；
EGR rate is equal to the gas concentration lwevel/exhaust gas concentration lwevel measured (because main component is dioxy in exhaust
Change carbon, therefore EGR exhaust concentration substituted using gas concentration lwevel, exhaust gas concentration lwevel is measured by discharge instrument), wherein,
The gas concentration lwevel measured is each measuring point for going deep into inlet manifold porch and the cylinder porch of multiple inlet manifold respectively
Gas concentration lwevel.The EGR rate of each measuring point can be calculated further according to the exhaust gas concentration lwevel measured.
Again, the EGR exhaust uniformity and each cylinder (each inlet manifold of each measuring point of inlet manifold porch are calculated
Cylinder porch) the EGR exhaust uniformity；
The average value of multiple measuring point EGR rates of inlet manifold porch is first obtained, then passes through the (EGR rate of each measuring point-more
The average value of individual measuring point EGR rate)/multiple being averaged for measuring point EGR rate is worth to the EGR exhaust unevenness of each measuring point, then leads to
Cross (1-EGR waste gas unevenness) and obtain the EGR exhaust uniformity of each measuring point.Each cylinder EGR exhaust is calculated with same method
The uniformity, blender mixing uniformity is evaluated by the mixture homogeneity and difference of each measuring point.
As shown in figure 1, the measurement apparatus bag according to the engine EGR waste gas mixture homogeneity of the specific embodiment of the invention
Include：Gauge head, transfer tube and gas analyzer, wherein, gauge head to be multiple, be separately positioned on gas handling system inlet manifold porch and
Each measuring point of the cylinder porch of multiple inlet manifold, for gathering the mixing of inlet manifold porch and multiple inlet manifold
Gas, the titanium dioxide of the cylinder porch of gas analyzer measurement inlet manifold's entrance and multiple inlet manifold is sent into through switching device
Concentration of carbon.Gauge head is arranged on inlet manifold porch and the cylinder porch of multiple inlet manifold by the way of threaded connection,
The gauge head being wherein arranged at gas manifold entrance is five, is respectively designated as the first measuring point, the second measuring point, the 3rd measuring point, the 4th
Measuring point, the 5th measuring point, the first measuring point, the second measuring point, the 3rd measuring point, the 4th measuring point are distributed into even circumferential, and it is total that it gos deep into air inlet
The depth of pipe is 1-3mm, and the 5th measuring point and the 3rd measuring point into 45 degree of angles and go deep into the center of inlet manifold, and each measuring point center is with entering
Gas manifold entrance distance 10-20mm.
Gauge head installed in the cylinder porch of multiple inlet manifold corresponds to engine 1-6 cylinders respectively, with inlet manifold
The distance 5-10mm of cylinder entrance, it gos deep into inlet manifold center, symmetrical with upper and lower tube wall.
Transfer tube includes：Connectivity port 1, intervalve 2 and gas analyzer connectivity port 3, wherein, connectivity port 1 be with
Multiple corresponding to gauge head, each connectivity port 1 is provided with switching switch 4；One end of connectivity port 1 and the side of intervalve 2
Connection, the other end are connected with gauge head to gather the gaseous mixture of inlet manifold porch and multiple inlet manifold, are conducted into centre
Pipe 2.The both ends sealing of intervalve 2, connectivity port 1 can be expanded, to meet difference cylinder number engine calls.
One end of gas analyzer connectivity port 3 is connected with the side of intervalve 2, and the other end is connected with gas analyzer.
Switching switch 5 is provided with gas analyzer connectivity port 3.By engine be adjusted to needed for measurement operating mode, be first turned on
The switching switch of the connectivity port 1 of first measuring point connection, records the gas handling system measured by gas analyzer from connectivity port and enters
Gas concentration lwevel at gas manifold entrance, with reference to exhaust gas concentration lwevel, then with gas handling system gas concentration lwevel/exhaust
Gas concentration lwevel obtains the first measuring point EGR rate.Similarly, the second measuring point to the 5th measuring point, 1 to 6 cylinder are measured with same method
Gas handling system gas concentration lwevel and each measuring point corresponding to exhaust gas concentration lwevel, calculate the EGR of each measuring point
Rate.In whole measurement process, the switching switch of connectivity port is opened all the time.The first measuring point is obtained to the EGR rate of the 5th measuring point
Average value, by (measured value-average value)/be averagely worth to the first measuring point to the EGR exhaust unevenness of the 5th measuring point, then lead to
Cross (1-EGR waste gas unevenness) and obtain the first measuring point to the EGR exhaust uniformity of the 5th measuring point.1 is calculated with same method
To each cylinder EGR exhaust uniformity of 6 cylinders, it is equal that blender mixing is evaluated by the EGR exhaust mixture homogeneity and difference of each measuring point
Even property.
The application motion can measure gas handling system EGR exhaust waste gas mixture homogeneity, so as to evaluate EGR mixer mixing
Uniformity, the design for the engine EGR and fuel gas mixer of equivalent burning+EGR+ post-processing technologies provide foundation.Can be with
By each cylinder combustion stability of EGR exhaust mixture homogeneity engine evaluated, row gentle pinking border uniformity, so as to from
Many-side goes to evaluate influence of the blender mixing uniformity to engine performance, farthest reduces blender design defect.
To sum up, the measuring method of the engine EGR waste gas mixture homogeneity is being entered by measuring the carbon dioxide of EGR exhaust
The concentration (gas handling system can be divided into N number of section, and each section can arrange N number of measuring point) in any section of gas system, according to titanium dioxide
Carbon calculates its mixture homogeneity in the concentration of each opening position, is mixed according to the mixture homogeneity of each opening position and diversity judgement
Device mixing uniformity.
The description of the foregoing specific illustrative embodiment to the present invention is to illustrate and the purpose of illustration.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to above-mentioned teaching, can be much changed
And change.The purpose of selecting and describing the exemplary embodiment is that explain that the certain principles of the present invention and its reality should
With so that those skilled in the art can realize and utilize the present invention a variety of exemplaries and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (1)
- A kind of 1. measurement apparatus of engine EGR waste gas mixture homogeneity, it is characterised in that including：Gauge head, it is multiple, is separately positioned on gas handling system inlet manifold porch and the cylinder porch of multiple inlet manifold Each measuring point at, for gathering the gaseous mixture of inlet manifold porch and multiple inlet manifold；The gauge head is connected using screw thread The mode connect is arranged on the inlet manifold porch and the cylinder porch of multiple inlet manifold；Enter installed in inlet manifold The gauge head at mouthful is five；Transfer tube, it includes：Connectivity port, intervalve and gas analyzer connectivity port, the connectivity port are and the survey Multiple corresponding to head, each connectivity port is provided with the first switching switch；One end of the connectivity port and the side of intervalve Connection, the other end are connected with the gauge head to gather the gaseous mixture of inlet manifold porch and multiple inlet manifold；The centre The both ends sealing of pipe；One end of the gas analyzer connectivity port connects with the side of intervalve；The gas analyzer connects Connect and the second switching switch is provided with port；AndGas analyzer, it is connected with the other end of the gas analyzer connectivity port.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105445422A (en) * | 2015-11-13 | 2016-03-30 | 广西玉柴机器股份有限公司 | Method and device for measuring fuel gas mixing uniformity of engine |
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| CN113834901A (en) * | 2020-06-23 | 2021-12-24 | 拓荆科技股份有限公司 | Gas mixing effect detection device and detection method |
| CN112431695A (en) * | 2020-12-15 | 2021-03-02 | 广西玉柴机器股份有限公司 | Measuring system for EGR rate of gas engine cylinder |
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| US7921704B2 (en) * | 2008-09-30 | 2011-04-12 | Visteon Global Technologies, Inc. | Virtual flex fuel sensor for spark ignition engines using ionization signal |
| US8977470B2 (en) * | 2011-09-13 | 2015-03-10 | Ford Global Technologies, Llc | Method and system for sampling intake manifold pressure |
| CN204575308U (en) * | 2015-04-11 | 2015-08-19 | 成都陵川特种工业有限责任公司 | Exhaust manifold quality detection device |
| CN104879227B (en) * | 2015-05-29 | 2017-07-28 | 潍柴动力股份有限公司 | diesel engine EGR control system and control method |
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| CN105445422A (en) * | 2015-11-13 | 2016-03-30 | 广西玉柴机器股份有限公司 | Method and device for measuring fuel gas mixing uniformity of engine |
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