CN105445422A - Method and device for measuring fuel gas mixing uniformity of engine - Google Patents
Method and device for measuring fuel gas mixing uniformity of engine Download PDFInfo
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- CN105445422A CN105445422A CN201510777624.9A CN201510777624A CN105445422A CN 105445422 A CN105445422 A CN 105445422A CN 201510777624 A CN201510777624 A CN 201510777624A CN 105445422 A CN105445422 A CN 105445422A
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Abstract
The invention discloses a method and a device for measuring the fuel gas mixing uniformity of an engine. The measurement method comprises the following steps: firstly, measuring the concentration of methane, ethane or propane at a plurality of measurement points at the inlet of an air intake header pipe of an air intake system and at air cylinder inlets of a plurality of air intake manifolds respectively; and, secondly, calculating the fuel gas uniformity at each measurement point at the inlet of the air intake header pipe and the fuel gas uniformity at the air cylinder inlets of each air intake manifold. According to the measurement method of the fuel gas mixing uniformity of the engine, the concentration of methane, ethane or propane of fuel gas at any part of any cross section of the air intake system is measured, the mixing uniformity is calculated according to the concentration of methane, ethane or propane at the corresponding part, and the mixing uniformity of a mixer is judged according to the mixing uniformity and differences at each point (measurement point).
Description
Technical field
The present invention relates to engine gas mixture homogeneity detection field, particularly a kind of measuring method of engine gas mixture homogeneity and device.
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), because principal ingredient in waste gas is the methane of high specific heat capacity, ethane or propane and water, 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 present application 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 invention, 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.
Summary of the invention
The object of the present invention is to provide a kind of measuring method and device of engine gas mixture homogeneity of simple and reasonable steps, the measuring method of this engine gas mixture homogeneity is by measuring the methane of combustion gas, ethane or the propane concentration in gas handling system arbitrary cross section any position, its mixture homogeneity is calculated in the concentration of each position, according to this mixture homogeneity and diversity judgement mixer mixing uniformity according to methane, ethane or propane.
For achieving the above object, according to an aspect of the present invention, provide a kind of measuring method and device of engine gas mixture homogeneity, comprise the following steps: first, the multiple measuring point of gas handling system inlet manifold porch measured respectively and the methane of the cylinder porch of multiple inlet manifold, ethane or propane concentration; Secondly, the combustion gas uniformity coefficient of each measuring point of inlet manifold porch and the combustion gas uniformity coefficient of the cylinder porch of each inlet manifold is calculated.
Preferably, in technique scheme, the mean value of the combustion gas uniformity coefficient=1-of each measuring point of inlet manifold porch (mean value of the measured value of the methane of each measuring point, ethane or propane concentration-multiple measuring point methane, ethane or propane concentration)/multiple measuring point methane, ethane or propane concentration.
Preferably, in technique scheme, the mean value of the cylinder porch methane of the combustion gas uniformity coefficient=1-of the cylinder porch of each inlet manifold (mean value of the cylinder porch methane of measured value-multiple inlet manifold of the methane of the cylinder porch of each inlet manifold, ethane or propane concentration, ethane or propane concentration)/multiple inlet manifold, ethane or propane concentration.
According to another aspect of the present invention, provide a kind of measurement mechanism of engine gas mixture homogeneity, 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 inlet manifold porch is five.
Preferably, in technique scheme, gas analyzer connectivity port is provided with the second change-over switch.
Compared with prior art, the present invention has following beneficial effect: the measuring method of this engine gas mixture homogeneity passes through the methane of measurement combustion gas, ethane or the propane concentration in gas handling system arbitrary cross section any position, its mixture homogeneity is calculated in the concentration of each position, according to this mixture homogeneity and diversity judgement mixer mixing uniformity according to methane, ethane or propane.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the measurement mechanism of engine gas mixture homogeneity of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention 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 gas mixture homogeneity of the specific embodiment of the invention comprise:
First, the multiple measuring point of gas handling system inlet manifold porch measured respectively and the methane of the cylinder porch of multiple inlet manifold, ethane or propane concentration;
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.
Carry out the cylinder porch that the cross section of gas handling system that methane, ethane or propane concentration measure can be selected in inlet manifold porch and multiple inlet manifold, 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 gas analyzer measure the methane of inlet manifold's entrance, ethane or propane concentration through switching device; The single measuring point going deep into multiple inlet manifold is respectively set in the cylinder porch of multiple inlet manifold, single measuring point gathers the combination gas of multiple inlet manifold, sends into gas analyzer measure the methane of the cylinder porch of multiple inlet manifold, ethane or propane concentration through switching device.
Secondly, the combustion gas uniformity coefficient of each measuring point of inlet manifold porch and the combustion gas uniformity coefficient of the cylinder porch of each inlet manifold is calculated;
First obtain the mean value of multiple measuring point methane of inlet manifold porch, ethane or propane concentration, obtain the combustion gas unevenness of each measuring point by the mean value of (mean value of the measured value of the methane of each measuring point, ethane or propane concentration-multiple measuring point methane, ethane or propane concentration)/multiple measuring point methane, ethane or propane concentration again, then obtain the combustion gas uniformity coefficient of each measuring point by (1-combustion gas unevenness).Use the same method and calculate the combustion gas uniformity coefficient of each cylinder (the cylinder porch of each inlet manifold), by mixture homogeneity and the difference evaluation fuel gas mixer mixing uniformity of each measuring point.
As shown in Figure 1, measurement mechanism according to the engine gas mixture homogeneity of the specific embodiment of the invention 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, sending into gas analyzer through switching device and measuring the methane of the cylinder porch of multiple inlet manifold, ethane or propane concentration.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 methane of the gas handling system inlet manifold porch measured by connectivity port, ethane or propane concentration, in like manner, use the same method measurement second measuring point to the 5th measuring point, the gas handling system methane of 1 to 6 cylinder, ethane or propane concentration.In whole measuring process, the change-over switch of connectivity port is opened all the time.Obtain the first measuring point 1 to the methane of the 5th measuring point, ethane or propane concentration mean value, obtain the combustion gas unevenness of the first measuring point to the 5th measuring point by (measured value-mean value)/mean value, then obtain the combustion gas uniformity coefficient of the first measuring point to the 5th measuring point by (1-combustion gas unevenness).Use the same method each cylinder combustion gas uniformity coefficient of calculating 1 to 6 cylinder, evaluates mixer mixing uniformity by the mixture homogeneity of each measuring point and difference.
To sum up, the measuring method of this engine gas mixture homogeneity is by measuring the methane of combustion gas, ethane or the propane concentration in gas handling system arbitrary cross section any position, its mixture homogeneity is calculated in the concentration of each position, according to each position mixture homogeneity and diversity judgement mixer mixing uniformity according to methane, ethane or propane.
The aforementioned description to concrete exemplary of the present invention is to illustrate and the object of illustration.These descriptions not want the present invention 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 invention and practical application thereof, thus those skilled in the art can be realized and utilize various different exemplary of the present invention and various different selection and change.Scope of the present invention is intended to limited by claims and equivalents thereof.
Claims (7)
1. a measuring method for engine gas mixture homogeneity, is characterized in that, comprises the following steps:
First, the multiple measuring point of gas handling system inlet manifold porch measured respectively and the methane of the cylinder porch of multiple inlet manifold, ethane or propane concentration;
Secondly, the combustion gas uniformity coefficient of each measuring point of inlet manifold porch and the combustion gas uniformity coefficient of the cylinder porch of each inlet manifold is calculated.
2. the measuring method of engine gas mixture homogeneity according to claim 1, it is characterized in that, the mean value of the combustion gas uniformity coefficient=1-of each measuring point of described inlet manifold porch (mean value of the measured value of the methane of each measuring point, ethane or propane concentration-multiple measuring point methane, ethane or propane concentration)/multiple measuring point methane, ethane or propane concentration.
3. the measuring method of engine gas mixture homogeneity according to claim 1, it is characterized in that, the mean value of the cylinder porch methane of the combustion gas uniformity coefficient=1-of the cylinder porch of each inlet manifold described (mean value of the cylinder porch methane of measured value-multiple inlet manifold of the methane of the cylinder porch of each inlet manifold, ethane or propane concentration, ethane or propane concentration)/multiple inlet manifold, ethane or propane concentration.
4. a measurement mechanism for engine gas mixture homogeneity, is characterized in that, comprising:
Gauge head, it is multiple, is 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.
5. the measurement mechanism of engine gas mixture homogeneity according to claim 4, 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.
6. the measurement mechanism of engine gas mixture homogeneity according to claim 4, is characterized in that, the described gauge head being arranged on gas manifold entrance place is five.
7. the measurement mechanism of engine gas mixture homogeneity according to claim 4, is characterized in that, described gas analyzer connectivity port is provided with the second change-over switch.
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| CN201510777624.9A CN105445422B (en) | 2015-11-13 | 2015-11-13 | The measurement method and device of engine gas mixture homogeneity |
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| CN201510777624.9A CN105445422B (en) | 2015-11-13 | 2015-11-13 | The measurement method and device of engine gas mixture homogeneity |
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| CN105445422A true CN105445422A (en) | 2016-03-30 |
| CN105445422B CN105445422B (en) | 2019-02-26 |
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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 |
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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 |
| US20150184607A1 (en) * | 2011-09-13 | 2015-07-02 | 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 |
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