CN105445422B - The measurement method and device of engine gas mixture homogeneity - Google Patents
The measurement method and device of engine gas mixture homogeneity Download PDFInfo
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- CN105445422B CN105445422B CN201510777624.9A CN201510777624A CN105445422B CN 105445422 B CN105445422 B CN 105445422B CN 201510777624 A CN201510777624 A CN 201510777624A CN 105445422 B CN105445422 B CN 105445422B
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Abstract
The invention discloses the measurement methods and device of a kind of engine gas mixture homogeneity.The measurement method is the following steps are included: firstly, methane, ethane or the propane concentration of the cylinder inlet of multiple measuring points and multiple inlet manifold of the gas handling system inlet manifold inlet measured respectively；Secondly, calculating the combustion gas uniformity of the combustion gas uniformity of each measuring point of inlet manifold inlet and the cylinder inlet of each inlet manifold.The measurement method of the engine gas mixture homogeneity passes through the concentration of methane, ethane or propane in any section any position of gas handling system of measurement combustion gas, according to its mixture homogeneity of the concentration calculation of methane, ethane or propane at this location, according to each position (measuring point) mixture homogeneity and diversity judgement mixer mixing uniformity.
Description
Technical field
The present invention relates to engine gas mixture homogeneity detection field, in particular to a kind of engine gas is uniformly mixed
The measurement method and device of degree.
Background technique
The noxious emission of engine is to cause one of important sources of atmosphere pollution, and main exhaust pollutant is nitrogen oxygen
Compound, hydrocarbons and carbon monoxide, with increasing for vehicle, exhaust contaminant aggravates the pollution level of air, therefore state
Family is increasingly severe to the limitation of motor exhaust pollutant discharge amount.Gas engine on sale at present is all satisfied five exhaust method of state
The technical requirements of rule, it is increasingly severe with engine emission regulation, exploitation meet the gas engine of six emission regulation of state at
The task of top priority, six emission regulation of state limit more NOx in tail gas (nitrogen oxides) discharge amount relative to five emission regulation of state
Strictly, equivalent burning+EGR (gas recirculation system)+post-processing technology path is used to further decrease NOx discharge with full
Sufficient six emission regulation demands of state.A part of exhaust gas is caused gas handling system by EGR (gas recirculation system), 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 mixes with EGR exhaust) after conjunction, by
Main component makes NOx to reduce in-cylinder combustion temperature for methane, ethane or the propane and water of high specific heat capacity in exhaust gas
Discharge amount further decreases (cylinder temperature reduces, and the chemical reaction rate for generating NOx is slack-off).
After exhaust gas is added in gas handling system, to each cylinder combustion stability of engine, the warm consistency of detonation pressure and row has aobvious
Writing influences, it is therefore desirable to it is equal that exhaust gas and the mixed mixing of air fuel gas in gas handling system are measured using a kind of device and method
Evenness to evaluate mixer mixing uniformity, and provides foundation to design, makes burn cycle stability bandwidth, detonation pressure and row Wen Bujun
Evenness is controlled in reasonable range.
After EGR exhaust is added in gas handling system, it can have a certain impact to mixer mixing uniformity, mainly pass through at present
The detonation pressure and instruction average pressure that each cylinder is acquired using Combustion tester calculate detonation pressure and the instruction mean pressure of each cylinder
The power uniformity, according to each cylinder evenness evaluate mixer mixing uniformity, but its can only judge it is uniform between each cylinder of engine
Sex differernce can not isolate the uniform sex differernce of each cylinder combustion gas or the uniform sex differernce of EGR exhaust, can not be according to combustion gas and EGR
Exhaust gas mixture homogeneity comprehensive descision mixer mixing uniformity, i.e., can not judge fuel gas mixer design it is unreasonable or
EGR mixer design is unreasonable.The device of EGR exhaust and the combustion gas mixing uniformity in a kind of measurement gas handling system of the present application
((device can not only measure EGR exhaust, can also measure gas component), judges EGR exhaust and air and combustion gas with method
Mixture homogeneity (EGR exhaust and gas component volume content distribution consistency degree) after mixing is uniformly mixed to evaluate mixer
Property.
The information disclosed in the background technology section is intended only to increase the understanding to general background of the invention, without answering
When being considered as recognizing or imply that the information constitutes the prior art already known to those of ordinary skill in the art in any form.
Summary of the invention
The purpose of the present invention is to provide a kind of measurement methods of the engine gas mixture homogeneity of simple and reasonable steps
And device, the measurement method of the engine gas mixture homogeneity is by methane, ethane or the propane of measurement combustion gas in air inlet system
The concentration for any section any position of uniting, the concentration calculation located at various locations according to methane, ethane or propane its be uniformly mixed
Degree, according to the mixture homogeneity and diversity judgement mixer mixing uniformity.
To achieve the above object, according to an aspect of the invention, there is provided a kind of engine gas mixture homogeneity
Measurement method and device, comprising the following steps: firstly, multiple measuring points of the gas handling system inlet manifold inlet measured respectively and
Methane, ethane or the propane concentration of the cylinder inlet of multiple inlet manifold；Secondly, calculating each survey of inlet manifold inlet
The combustion gas uniformity of the cylinder inlet of the combustion gas uniformity and each inlet manifold of point.
Preferably, in above-mentioned technical proposal, the combustion gas uniformity=1- (each survey of each measuring point of inlet manifold inlet
The methane of point, the multiple measuring point methane of measured value-of ethane or propane concentration, ethane or propane concentration average value)/multiple measuring points
The average value of methane, ethane or propane concentration.
Preferably, in above-mentioned technical proposal, the combustion gas uniformity=1- of the cylinder inlet of each inlet manifold (it is each into
The methane of the cylinder inlet of gas manifold, the multiple inlet manifold of measured value-of ethane or propane concentration cylinder inlet methane,
The average value of ethane or propane concentration) the cylinder inlet methane of/multiple inlet manifold, ethane or propane concentration average value.
According to another aspect of the present invention, a kind of measuring device of engine gas mixture homogeneity is provided, comprising:
Gauge head is separately positioned on each of the cylinder inlet of gas handling system inlet manifold inlet and multiple inlet manifold to be multiple
A measuring point, for acquiring the gaseous mixture of inlet manifold inlet and multiple inlet manifold；Transfer tube comprising: connectivity port, in
Between pipe and gas analyzer connectivity port, the connectivity port be it is corresponding with the gauge head multiple, each connectivity port is all provided with
It is equipped with the first switching switch；One end of the connectivity port is connected to the side of intermediate tube, and the other end connect to adopt with the gauge head
Collect the gaseous mixture of inlet manifold inlet and multiple inlet manifold；The both ends of the intermediate tube seal；The gas analyzer connects
The one end for connecing port is connected to the side of intermediate tube；And gas analyzer, it is another with the gas analyzer connectivity port
One end connection.
Preferably, in above-mentioned technical proposal, gauge head is mounted on the inlet manifold inlet by the way of being threadedly coupled
With the cylinder inlet of multiple inlet manifold.
Preferably, in above-mentioned technical proposal, the gauge head for being mounted on inlet manifold inlet is five.
Preferably, in above-mentioned technical proposal, the second switching switch is provided on gas analyzer connectivity port.
Compared with prior art, the invention has the following beneficial effects: the measurement sides of the engine gas mixture homogeneity
Method passes through the concentration of methane, ethane or propane in any section any position of gas handling system of measurement combustion gas, according to methane, ethane
Or concentration calculation its mixture homogeneity that propane is located at various locations, it is mixed according to the mixture homogeneity and diversity judgement mixer
Uniformity.
Detailed description of the invention
Fig. 1 is the schematic diagram of the measuring device of engine gas mixture homogeneity of the invention.
Specific embodiment
With reference to the accompanying drawing, specific embodiments of the present invention will be described in detail, it is to be understood that guarantor of the invention
Shield range is not limited by the specific implementation.
Unless otherwise explicitly stated, otherwise in entire disclosure and claims, term " includes " or its change
Changing such as "comprising" or " including " etc. will be understood to comprise stated element or component, and not exclude other members
Part or other component parts.
The specific steps of the measurement method of the engine gas mixture homogeneity of specific embodiment include: according to the present invention
Firstly, the multiple measuring points of gas handling system inlet manifold inlet and the cylinder of multiple inlet manifold that measure respectively enter
Methane, ethane or propane concentration at mouthful；
The gas handling system of engine include: 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 section for carrying out the gas handling system of methane, ethane or propane concentration measurement can choose in inlet manifold inlet and
The cylinder inlet of multiple inlet manifold, in inlet manifold inlet, multiple measuring points of inlet manifold, multiple measuring points are goed deep into setting
The gaseous mixture for acquiring inlet manifold inlet is sent into methane, the second of gas analyzer measurement inlet manifold's entrance through switching device
Alkane or propane concentration；In the cylinder inlet of multiple inlet manifold, the single measuring point of multiple inlet manifold is goed deep into setting respectively, single
A measuring point acquires the gaseous mixture of multiple inlet manifold, is sent into the cylinder that gas analyzer measures multiple inlet manifold through switching device
Methane, ethane or the propane concentration of inlet.
Secondly, calculating the combustion gas uniformity of each measuring point of inlet manifold inlet and the cylinder entrance of each inlet manifold
The combustion gas uniformity at place；
The average value of multiple measuring point methane of inlet manifold inlet, ethane or propane concentration is first found out, then by (each
The methane of measuring point, the multiple measuring point methane of measured value-of ethane or propane concentration, ethane or propane concentration average value)/multiple surveys
The average value of point methane, ethane or propane concentration obtains the combustion gas unevenness of each measuring point, then by the way that (1- combustion gas is uneven
Degree) obtain the combustion gas uniformity of each measuring point.Each cylinder (the cylinder inlet of each inlet manifold) is calculated with same method
The combustion gas uniformity evaluates fuel gas mixer mixing uniformity by the mixture homogeneity and difference of each measuring point.
As shown in Figure 1, the measuring device of the engine gas mixture homogeneity of specific embodiment includes: according to the present invention
Gauge head, transfer tube and gas analyzer, wherein gauge head be it is multiple, be separately positioned on gas handling system inlet manifold inlet and more
Each measuring point of the cylinder inlet of a inlet manifold, for acquiring the mixing of inlet manifold inlet and multiple inlet manifold
Gas is sent into methane, ethane or the propane concentration that gas analyzer measures the cylinder inlet of multiple inlet manifold through switching device.
Gauge head is mounted on the cylinder inlet of inlet manifold inlet and multiple inlet manifold by the way of being threadedly coupled, wherein installing
Gauge head at gas manifold entrance is five, is respectively designated as the first measuring point, the second measuring point, third measuring point, the 4th measuring point, the 5th
Measuring point, the first measuring point, the second measuring point, third measuring point, the 4th measuring point are distributed at even circumferential, and the depth for going deep into inlet manifold is
1-3mm, the 5th measuring point and third measuring point are at 45 degree angles and go deep into the center of inlet manifold, each measuring point center and inlet manifold's entrance
Distance 10-20mm.
The gauge head for being mounted on the cylinder inlet of multiple inlet manifold respectively corresponds engine 1-6 cylinder, with inlet manifold
The distance 5-10mm of cylinder entrance, gos deep into inlet manifold center, symmetrical with upper and lower tube wall.
Transfer tube includes: connectivity port 1, intermediate tube 2 and gas analyzer connectivity port 3, wherein connectivity port 1 be with
Gauge head is corresponding multiple, and each connectivity port 1 is provided with switching switch 4；One end of connectivity port 1 and the side of intermediate tube 2
Connection, the other end connect to acquire the gaseous mixture of inlet manifold inlet and multiple inlet manifold with gauge head, are conducted into centre
Pipe 2.The both ends of intermediate tube 2 seal, and connectivity port 1 can be expanded, to meet difference cylinder number engine calls.
One end of gas analyzer connectivity port 3 is connected to the side of intermediate tube 2, and the other end is connect with gas analyzer.
Switching switch 5 is provided on gas analyzer connectivity port 3.By engine be adjusted to needed for measure operating condition, be first turned on
First measuring point connection connectivity port 1 switching switch, record gas analyzer from gas handling system measured by connectivity port into
Methane, ethane or propane concentration at gas manifold entrance, similarly, with same method measure the second measuring point to the 5th measuring point, 1 to
Gas handling system methane, ethane or the propane concentration of 6 cylinders.In entire measurement process, the switching switch of connectivity port is opened always.
Methane, ethane or the propane concentration average value for finding out 1 to the 5th measuring point of the first measuring point pass through (measured value-average value)/average value
The combustion gas unevenness of the first measuring point to the 5th measuring point is obtained, then the first measuring point is obtained to the 5th by (1- combustion gas unevenness)
The combustion gas uniformity of measuring point.Each cylinder combustion gas uniformity that 1 to 6 cylinder is calculated with same method passes through being uniformly mixed for each measuring point
Degree and difference evaluate mixer mixing uniformity.
To sum up, the measurement method of the engine gas mixture homogeneity is existed by methane, ethane or the propane of measurement combustion gas
The concentration of any section any position of gas handling system, it is mixed for the concentration calculation located at various locations according to methane, ethane or propane
The uniformity is closed, according to mixture homogeneity at each position and diversity judgement mixer mixing uniformity.
The aforementioned description to specific exemplary embodiment of the invention is in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to the above instruction, can much be changed
And variation.The purpose of selecting and describing the exemplary embodiment is that explaining specific principle of the invention and its actually answering
With so that those skilled in the art can be realized and utilize a variety of different exemplary implementation schemes of the invention and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (1)
1. a kind of measuring device of engine gas mixture homogeneity characterized by comprising
Gauge head is separately positioned on the cylinder inlet of gas handling system inlet manifold inlet and multiple inlet manifold to be multiple
Each measuring point, for acquiring the gaseous mixture of inlet manifold inlet and multiple inlet manifold；The gauge head is using threaded connection
Mode be mounted on the cylinder inlet of the inlet manifold inlet and multiple inlet manifold；
Transfer tube comprising: connectivity port, intermediate tube and gas analyzer connectivity port, the connectivity port are and the survey
Corresponding multiple, each connectivity port is provided with the first switching switch；One end of the connectivity port and the side of intermediate tube
Connection, the other end connect to acquire the gaseous mixture of inlet manifold inlet and multiple inlet manifold with the gauge head；The centre
The both ends of pipe seal；One end of the gas analyzer connectivity port is connected to the side of intermediate tube；And
Gas analyzer is connect with the other end of the gas analyzer connectivity port；The gas analyzer connectivity port
On be provided with the second switching switch.
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| Application Number | Priority Date | Filing Date | Title |
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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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| Application Number | Priority Date | Filing Date | Title |
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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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| Publication Number | Publication Date |
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| CN105445422A CN105445422A (en) | 2016-03-30 |
| CN105445422B true CN105445422B (en) | 2019-02-26 |
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Citations (3)
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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 |
| 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 |
| CN104879227A (en) * | 2015-05-29 | 2015-09-02 | 潍柴动力股份有限公司 | Diesel engine EGR (Exhaust Gas Recirculation) control system and control method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8977470B2 (en) * | 2011-09-13 | 2015-03-10 | Ford Global Technologies, Llc | Method and system for sampling intake manifold pressure |
| CN105606764B (en) * | 2015-11-13 | 2018-03-16 | 广西玉柴机器股份有限公司 | The measuring method and device of engine EGR waste gas mixture homogeneity |
-
2015
- 2015-11-13 CN CN201510777624.9A patent/CN105445422B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7921704B2 (en) * | 2008-09-30 | 2011-04-12 | Visteon Global Technologies, Inc. | Virtual flex fuel sensor for spark ignition engines using ionization signal |
| 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 |
| CN104879227A (en) * | 2015-05-29 | 2015-09-02 | 潍柴动力股份有限公司 | Diesel engine EGR (Exhaust Gas Recirculation) control system and control method |
Non-Patent Citations (1)
| Title |
|---|
| 废气再循环对各缸进气均匀性的影响;孙哲 等;《2008年中国汽车工程学会年会论文集》;20081107;第1、2.2、3节，第91页右栏最后一段 |
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