CN205080121U - Measurement device for engine EGR waste gas mixture homogeneity - Google Patents
Measurement device for engine EGR waste gas mixture homogeneity Download PDFInfo
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- CN205080121U CN205080121U CN201520905956.6U CN201520905956U CN205080121U CN 205080121 U CN205080121 U CN 205080121U CN 201520905956 U CN201520905956 U CN 201520905956U CN 205080121 U CN205080121 U CN 205080121U
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Abstract
The utility model discloses a measurement device for engine EGR waste gas mixture homogeneity. This measuring device includes: the gauge head, it is a plurality of, sets up each measurement station in air intake system inlet manifold entrance and a plurality of air intake manifold's cylinder entrance respectively, the switching pipe, it includes: connection port, intervalve and gas analysis appearance connection port, this connection port's one end and the side of intervalve intercommunication, the other end with the gas mixture of gathering inlet manifold entrance and a plurality of air intake manifold is connected to the gauge head, gas analysis appearance connection port's one end and the side of intervalve intercommunication, and the gas analysis appearance, its with gas analysis appearance connection port's the other end is connected. The carbon dioxide of this measuring device through measuring EGR waste gas be in the concentration in the arbitrary cross -section of air intake system, calculates its mixture homogeneity in the concentration of each position department according to carbon dioxide, according to the mixture homogeneity and the difference judgement blender mixing uniformity of each position department.
Description
Technical field
The utility model relates to engine EGR detection field, particularly a kind of measurement mechanism of engine EGR waste gas mixture homogeneity.
Background technology
The noxious emission of engine is one of important sources causing atmospheric pollution, its main exhaust pollutant is oxides of nitrogen, hydrocarbons and carbon monoxide, along with increasing of vehicle, the pollution level of exhaust contaminant to air increases the weight of, and therefore country is increasingly severe to the restriction of motor exhaust pollutant discharge amount.Gas engine on sale at present all meets the technical requirement of state five Abgasgesetz, increasingly severe along with engine Abgasgesetz, the gas engine that exploitation meets state six Abgasgesetz has become the task of top priority, state six Abgasgesetz is more strict to the restriction of NOx in tail gas (oxides of nitrogen) discharge capacity relative to state five Abgasgesetz, adopts the technology path of equivalent burning+EGR (gas recirculation system)+aftertreatment to reduce NOx discharge further to meet state six emission regulation demands.A part of waste gas is caused gas handling system by EGR (gas recirculation system), (fuel gas injection mode is single point injection with entering cylinder combustion after air and combustion gas mixing, combustion gas first mixes with air, mix with EGR waste gas again), due to carbon dioxide and water that principal ingredient in waste gas is high specific heat capacity, thus reduce in-cylinder combustion temperature, NOx discharge is reduced (cylinder temperature reduces, and the chemical reaction rate generating NOx is slack-off) further.
After adding waste gas in gas handling system, to each cylinder combustion stability of engine, detonation pressure and the warm consistance of row have appreciable impact, therefore need to adopt a kind of apparatus and method to measure waste gas and the mixed mixture homogeneity of air fuel gas in gas handling system, to evaluate mixer mixing uniformity, and provide foundation to design, burn cycle stability bandwidth, detonation pressure and row's temperature unevenness are controlled in rational scope.
After adding EGR waste gas in gas handling system, can have a certain impact to mixer mixing uniformity, detonation pressure and instruction mean pressure at present mainly through adopting Combustion tester to gather each cylinder, calculate detonation pressure and the instruction mean pressure uniformity coefficient of each cylinder, all spend according to each cylinder and evaluate mixer mixing uniformity, but it can only judge the homogeneity difference between each cylinder of engine, each cylinder combustion gas homogeneity difference or EGR waste gas homogeneity difference cannot be isolated, cannot according to combustion gas and EGR waste gas mixture homogeneity comprehensive descision mixer mixing uniformity, namely cannot judge that fuel gas mixer design is unreasonable or EGR mixer design is unreasonable.The application's utility model is a kind of to be measured the apparatus and method of EGR waste gas and combustion gas mixing uniformity coefficient in gas handling system ((this device not only can measure EGR waste gas, also gas component can be measured), judge mixture homogeneity (EGR waste gas and gas component volume content distribution consistency degree) after EGR waste gas and air and combustion gas mixing, thus evaluate mixer mixing uniformity.
The information being disclosed in this background technology part is only intended to increase the understanding to general background of the present utility model, and should not be regarded as admitting or imply in any form that this information structure has been prior art that persons skilled in the art are known.
Utility model content
The purpose of this utility model is the measurement mechanism of the engine EGR waste gas mixture homogeneity providing a kind of advantages of simple, the measurement mechanism of this engine EGR waste gas mixture homogeneity is by measuring the concentration of carbon dioxide in the arbitrary cross section of gas handling system of EGR waste gas, its mixture homogeneity is calculated in the concentration of each position, according to mixture homogeneity and the diversity judgement mixer mixing uniformity of each position according to carbon dioxide.
For achieving the above object, a kind of measurement mechanism of engine EGR waste gas mixture homogeneity is provided according to the utility model, comprise: gauge head, it is multiple, be separately positioned on each measuring point of the cylinder porch of gas handling system inlet manifold porch and multiple inlet manifold, for gathering the combination gas of inlet manifold porch and multiple inlet manifold; Transfer tube, it comprises: connectivity port, intervalve and gas analyzer connectivity port, and described connectivity port is corresponding with described gauge head multiple, and each connectivity port is provided with the first change-over switch; One end of this connectivity port is communicated with the side of intervalve, and the other end is connected with described gauge head the combination gas gathering inlet manifold porch and multiple inlet manifold; The two ends sealing of described intervalve; Described one end of gas analyzer connectivity port is communicated with the side of intervalve; And gas analyzer, it is connected with the other end of described gas analyzer connectivity port.
Preferably, in technique scheme, gauge head adopts the mode be threaded to be arranged on the cylinder porch of described inlet manifold porch and multiple inlet manifold.
Preferably, in technique scheme, the described gauge head being arranged on gas manifold entrance place is five.
Preferably, in technique scheme, gas analyzer connectivity port is provided with the second change-over switch.
Compared with prior art, the utility model has following beneficial effect: the measurement mechanism of this engine EGR waste gas mixture homogeneity is by measuring the concentration of carbon dioxide in the arbitrary cross section of gas handling system of EGR waste gas, its mixture homogeneity is calculated in the concentration of each position, according to mixture homogeneity and the diversity judgement mixer mixing uniformity of each position according to carbon dioxide.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the measurement mechanism of engine EGR waste gas mixture homogeneity of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, but is to be understood that protection domain of the present utility model not by the restriction of embodiment.
Clearly represent unless otherwise other, otherwise in whole instructions and claims, term " comprise " or its conversion as " comprising " or " including " etc. by be understood to include the element of stating or ingredient, and do not get rid of other element or other ingredient.
Concrete steps according to the measuring method of the engine EGR waste gas mixture homogeneity of the utility model embodiment comprise:
First, the multiple measuring point of gas handling system inlet manifold porch measured respectively and the gas concentration lwevel of the cylinder porch of multiple inlet manifold;
The gas handling system of engine comprises: draft tube, fuel gas mixer, EGR mixer, air inlet tube, inlet manifold and inlet manifold, air enters gas handling system from draft tube, mix with combustion gas and EGR waste gas in fuel gas mixer, EGR mixer respectively, combination gas through air inlet tube, inlet manifold finally from multiple each cylinder of inlet manifold air inlet engine.
This gas concentration lwevel is gas concentration lwevel in combination gas.The cylinder porch in inlet manifold porch and multiple inlet manifold can be selected in the cross section of carrying out the gas handling system of carbon dioxide concentration measurement, the multiple measuring points going deep into inlet manifold are set in inlet manifold porch, multiple measuring point gathers the combination gas of inlet manifold porch, sends into through switching device the gas concentration lwevel that inlet manifold's entrance measured by gas analyzer; In the cylinder porch of multiple inlet manifold, the measuring point going deep into multiple inlet manifold is respectively set, each manifold arranges that a measuring point gathers the combination gas of each manifold respectively, sends into through switching device the gas concentration lwevel that the cylinder porch of multiple inlet manifold measured by gas analyzer.
Secondly, the carbon dioxide concentration according to recording calculates EGR rate;
Gas concentration lwevel/exhaust gas concentration lwevel that EGR rate equals to record is (because in exhaust, principal ingredient is carbon dioxide, therefore gas concentration lwevel is adopted to substitute EGR exhaust gas concentration, exhaust gas concentration lwevel is measured by discharging instrument), wherein, the gas concentration lwevel recorded is the gas concentration lwevel of each measuring point of the cylinder porch going deep into inlet manifold porch and multiple inlet manifold respectively.The EGR rate of each measuring point can be calculated again according to the exhaust gas concentration lwevel recorded.
Again, the EGR waste gas uniformity coefficient of each measuring point of inlet manifold porch and the EGR waste gas uniformity coefficient of each cylinder (the cylinder porch of each inlet manifold) is calculated;
First obtain the mean value of multiple measuring point EGR rate of inlet manifold porch, obtain the EGR waste gas unevenness of each measuring point by the mean value of (mean value of EGR rate-multiple measuring point EGR rate of each measuring point)/multiple measuring point EGR rate again, then obtain the EGR waste gas uniformity coefficient of each measuring point by (1-EGR waste gas unevenness).Use the same method and calculate each cylinder EGR waste gas uniformity coefficient, by mixture homogeneity and the difference evaluation mixer mixing uniformity of each measuring point.
As shown in Figure 1, measurement mechanism according to the engine EGR waste gas mixture homogeneity of the utility model embodiment comprises: gauge head, transfer tube and gas analyzer, wherein, gauge head is multiple, be separately positioned on each measuring point of the cylinder porch of gas handling system inlet manifold porch and multiple inlet manifold, for gathering the combination gas of inlet manifold porch and multiple inlet manifold, send into through switching device the gas concentration lwevel that the cylinder porch of inlet manifold's entrance and multiple inlet manifold measured by gas analyzer.Gauge head adopts the mode be threaded to be arranged on the cylinder porch of inlet manifold porch and multiple inlet manifold, the gauge head being wherein arranged on gas manifold entrance place is five, called after first measuring point, the second measuring point, the 3rd measuring point, the 4th measuring point, the 5th measuring point respectively, first measuring point, the second measuring point, the 3rd measuring point, the 4th measuring point become even circumferential to distribute, its degree of depth going deep into inlet manifold is 1-3mm, 5th measuring point becomes miter angle with the 3rd measuring point and gos deep into the center of inlet manifold, each measuring point center and inlet manifold's entrance distance 10-20mm.
Be arranged on the gauge head corresponding engine 1-6 cylinder respectively of the cylinder porch of multiple inlet manifold, with the distance 5-10mm of the cylinder entrance of inlet manifold, it gos deep into inlet manifold center, symmetrical with upper and lower tube wall.
Transfer tube comprises: connectivity port 1, intervalve 2 and gas analyzer connectivity port 3, and wherein, connectivity port 1 is corresponding with gauge head multiple, and each connectivity port 1 is provided with change-over switch 4; One end of connectivity port 1 is communicated with the side of intervalve 2, and the other end is connected the combination gas gathering inlet manifold porch and multiple inlet manifold with gauge head, is imported intervalve 2.The two 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 communicated with the side of intervalve 2, and the other end is connected with gas analyzer.Gas analyzer connectivity port 3 is provided with change-over switch 5.Engine is adjusted to the required operating mode measured, first the change-over switch of the connectivity port 1 be connected with the first measuring point is opened, record gas analyzer is from the gas concentration lwevel of the gas handling system inlet manifold porch measured by connectivity port, in conjunction with exhaust gas concentration lwevel, then obtain the first measuring point EGR rate with gas handling system gas concentration lwevel/exhaust gas concentration lwevel.In like manner, measurement second measuring point that uses the same method is to the 5th measuring point, and the gas handling system gas concentration lwevel of 1 to 6 cylinder and the exhaust gas concentration lwevel corresponding to each measuring point, calculate the EGR rate of each measuring point.In whole measuring process, the change-over switch of connectivity port is opened all the time.Obtain the EGR rate mean value of the first measuring point to the 5th measuring point, obtain the EGR waste gas unevenness of the first measuring point to the 5th measuring point by (measured value-mean value)/mean value, then obtain the EGR waste gas uniformity coefficient of the first measuring point to the 5th measuring point by (1-EGR waste gas unevenness).Use the same method each cylinder EGR waste gas uniformity coefficient of calculating 1 to 6 cylinder, evaluates mixer mixing uniformity by the EGR waste gas mixture homogeneity of each measuring point and difference.
The application's motion can measure gas handling system EGR waste gas waste gas mixture homogeneity, thus evaluates EGR mixer mixing uniformity, for the engine EGR of equivalent burning+EGR+ post-processing technology and the design of fuel gas mixer provide foundation.Can also by EGR waste gas mixture homogeneity engine evaluated each cylinder combustion stability, arrange gentle pinking border consistance, thus can go from many aspects to evaluate mixer mixing uniformity to the impact of engine performance, farthest reduce mixer design defect.
To sum up, (gas handling system can be divided into N number of cross section by concentration in the arbitrary cross section of gas handling system of the carbon dioxide of measuring EGR waste gas for the measurement mechanism of this engine EGR waste gas mixture homogeneity, N number of measuring point can be arranged in each cross section), its mixture homogeneity is calculated in the concentration of each position, according to mixture homogeneity and the diversity judgement mixer mixing uniformity of each position according to carbon dioxide.
The aforementioned description to concrete exemplary of the present utility model is to illustrate and the object of illustration.These descriptions not want the utility model to be defined as disclosed precise forms, and obviously, according to above-mentioned instruction, can much change and change.The object selected exemplary embodiment and describe is to explain certain principles of the present utility model and practical application thereof, thus those skilled in the art can be realized and utilize various different exemplary of the present utility model and various different selection and change.Scope of the present utility model is intended to limited by claims and equivalents thereof.
Claims (4)
1. a measurement mechanism for engine EGR waste gas mixture homogeneity, is characterized in that, comprising:
Gauge head, it is multiple, is separately positioned on each measuring point place of the cylinder porch of gas handling system inlet manifold porch and multiple inlet manifold, for gathering the combination gas of inlet manifold porch and multiple inlet manifold;
Transfer tube, it comprises: connectivity port, intervalve and gas analyzer connectivity port, and described connectivity port is corresponding with described gauge head multiple, and each connectivity port is provided with the first change-over switch; One end of this connectivity port is communicated with the side of intervalve, and the other end is connected with described gauge head the combination gas gathering inlet manifold porch and multiple inlet manifold; The two ends sealing of described intervalve; Described one end of gas analyzer connectivity port is communicated with the side of intervalve; And
Gas analyzer, it is connected with the other end of described gas analyzer connectivity port.
2. the measurement mechanism of engine EGR waste gas mixture homogeneity according to claim 1, is characterized in that, described gauge head adopts the mode be threaded to be arranged on the cylinder porch of described inlet manifold porch and multiple inlet manifold.
3. the measurement mechanism of engine EGR waste gas mixture homogeneity according to claim 1, is characterized in that, the described gauge head being arranged on gas manifold entrance place is five.
4. the measurement mechanism of engine EGR waste gas mixture homogeneity according to claim 1, is characterized in that, described gas analyzer connectivity port is provided with the second change-over switch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520905956.6U CN205080121U (en) | 2015-11-13 | 2015-11-13 | Measurement device for engine EGR waste gas mixture homogeneity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112649042A (en) * | 2020-11-27 | 2021-04-13 | 嵊州市浙江工业大学创新研究院 | Experimental measurement device for urban natural gas hydrogen-doped mixing effect |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112649042A (en) * | 2020-11-27 | 2021-04-13 | 嵊州市浙江工业大学创新研究院 | Experimental measurement device for urban natural gas hydrogen-doped mixing effect |
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