CN114636561A - PEMS test method - Google Patents
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- CN114636561A CN114636561A CN202210229913.5A CN202210229913A CN114636561A CN 114636561 A CN114636561 A CN 114636561A CN 202210229913 A CN202210229913 A CN 202210229913A CN 114636561 A CN114636561 A CN 114636561A
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- 238000010998 test method Methods 0.000 title claims abstract description 18
- BUCXEFZXWKUCCY-UHFFFAOYSA-N 4-methyl-3-(2-phenylethyl)-1,2,4-oxadiazol-5-one Chemical compound O1C(=O)N(C)C(CCC=2C=CC=CC=2)=N1 BUCXEFZXWKUCCY-UHFFFAOYSA-N 0.000 title claims abstract 26
- 238000002229 photoelectron microspectroscopy Methods 0.000 title claims abstract 26
- 238000012360 testing method Methods 0.000 claims abstract description 61
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 27
- 231100000719 pollutant Toxicity 0.000 claims abstract description 27
- 238000005259 measurement Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000003556 assay Methods 0.000 claims description 3
- 239000002826 coolant Substances 0.000 claims description 3
- 239000000446 fuel Substances 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 4
- 238000004904 shortening Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000000746 purification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
- G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0037—NOx
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/004—CO or CO2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0047—Organic compounds
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Abstract
The invention belongs to the technical field of emission tests of a whole vehicle, and discloses a PEMS test method which mainly comprises the following steps: s100, setting road resistance; s200, compiling a custom PEMS test working condition curve; s300, performing PEMS test; s400, recording engine ECU data flow; s500, analyzing the concentration of the pollutants collected in the PEMS test; s600, measuring the exhaust flow of the engine; s700, obtaining the quality value of the exhaust pollutants; s800, calculating the instantaneous work of the engine by utilizing an engine ECU data flow; and S900, calculating a specific emission value of the work base window. The PEMS test method can flexibly cover the existing vehicle-enterprise self-accumulation working condition database by customizing the PEMS circulating working condition, and can realize all-weather PEMS test without being interfered by natural environment factors, thereby improving the test efficiency and shortening the development period of products.
Description
Technical Field
The invention relates to the technical field of vehicle emission tests, in particular to a PEMS test method.
Background
The testing of the pollutants discharged by the motor vehicle plays an important role in the research of exhaust gas purification, and the efficient and correct testing of the specific emission value of harmful emissions of the motor vehicle is an important prerequisite for the research of the emission formation and the control technology thereof. The emission test System based on the PEMS (Portable Emissions Measurement System) equipment can realize the Measurement of pollutant emission under the actual road condition of the vehicle and meet the requirements of the emission regulations, and embodies the development trend of emission standards from engine bench test to vehicle actual Measurement. The PEMS test on the actual road has obvious defects, is greatly influenced by environmental conditions and cannot be carried out in all weather. Different self-accumulation working condition databases of different vehicle enterprises are different, and the PEMS cycle working condition of the existing PEMS test method cannot be completely suitable for the databases of all the vehicle enterprises, so that the test result has errors.
Therefore, a PEMS test method is needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a PEMS test method which can flexibly cover the existing self-accumulation working condition database of vehicle enterprises by customizing the PEMS cycle working condition and can realize all-weather PEMS test without being interfered by natural environment factors, thereby improving the test efficiency and shortening the development period of products.
In order to achieve the purpose, the invention adopts the following technical scheme:
a PEMS assay method comprising:
s100, setting road resistance;
s200, compiling a custom PEMS test working condition curve;
s300, performing PEMS test;
s400, recording engine ECU data flow;
s500, analyzing the concentration of the pollutants collected in the PEMS test;
s600, measuring the exhaust flow of the engine;
s700, obtaining the quality value of the exhaust pollutants;
s800, calculating the instantaneous work of the engine by utilizing an engine ECU data flow;
and S900, calculating a specific emission value of the work base window.
Optionally, the following steps are performed simultaneously with step S100:
and fixing the vehicle on a chassis dynamometer.
Optionally, the method for setting the road resistance in step S100 includes: the actual coasting resistance value and the calculated resistance value of the vehicle.
Optionally, the customized PEMS test condition in step S200 includes: urban working conditions, suburban working conditions and high-speed working conditions, or any combination of the urban working conditions, the suburban working conditions and the high-speed working conditions.
Optionally, after step S200, the PEMS device is calibrated, the measurement function of the PEMS device is started, the engine of the test sample vehicle is started, and the vehicle speed of the test sample vehicle is controlled to drive according to the user-defined PEMS test condition selected in step S200.
Alternatively, the engine ECU data stream in step S400 includes the engine speed, the engine reference torque, the engine fuel consumption rate, the engine actual torque percentage, the engine friction torque percentage, the engine coolant temperature, and the test sample vehicle running speed.
Optionally, in step S700, the quality value of the exhaust pollutants is calculated according to the following formula:
in the formula: noxt、COtAnd THCtInstantaneous discharge of each gaseous pollutant; noxconc、COconcAnd THCconcInstantaneous wet basis concentration of each gaseous pollutant in original exhaust gas; gexhIs the instantaneous exhaust flow.
Alternatively, in step S800, the engine instantaneous work is calculated according to the following formula:
Wt＝π×Tt×ntdiv (1.08X 108) (two)
In the formula: wtIs instantaneous work; t istIs a momentTime torque; n istIs the instantaneous rotational speed.
Optionally, the power base window calculation is performed before step S900.
Optionally, the power-base window calculation is performed according to the following formula:
the ith power base window period, i.e., t2,i-t1,iDetermined by the following formula:
W(t2,i)-W(t1,i)≥Wref(III)
In the formula: w (t)j,i) From the beginning to tj,iEngine cycle work over a period of time; wrefCycle work for the test cycle; t is t2,iIs determined by the following formula:
W(t2，i-Δt)-W(t1，i)<Wref≤W(t2，i)-W(t1，i) (IV)
In the formula: delta t refers to the test data acquisition period and does not exceed 1 second; w (t)2,i- Δ t) is from t1,iTo t2,i-engine cycle work over a time period of at.
Alternatively, in step S900, the specific emission value of the work base window is calculated according to the following formula:
in the formula: m is the emission quality of various pollutants in the power base window; w (t)2,i)-W(t1,i) Is the engine cycle work for the ith window during the test.
The invention has the beneficial effects that:
the invention realizes covering the existing self-accumulation working condition database of the vehicle and enterprise by compiling the self-defined PEMS test working condition curve, realizes all-weather PEMS test without being interfered by natural environmental factors by recording the ECU data flow of the engine, analyzing the pollutant concentration acquired by the PEMS test, measuring the exhaust flow of the engine, solving the quality value of the exhaust pollutant, calculating the instantaneous work of the engine by utilizing the ECU data flow of the engine and calculating the specific emission value of a power base window, thereby improving the test efficiency and shortening the development period of products.
Drawings
FIG. 1 is a flow chart of a PEMS test method according to an embodiment of the present invention;
FIG. 2 is a graph of operating conditions of a class N3 non-urban vehicle according to an embodiment of the present invention;
fig. 3 is a graph of a function basis method in step S900 of the PEMS testing method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Referring to fig. 1, the PEMS testing method provided in this embodiment includes the following steps:
step S100, road resistance is set.
Specifically, the following steps are performed simultaneously with step S100: and fixing the vehicle on a chassis dynamometer. This step may be performed simultaneously with step S100, or the road resistance may be set after the vehicle is fixed to the chassis dynamometer as shown in fig. 1.
The method of setting the road resistance in step S100 includes: the actual coasting resistance value and the calculated resistance value of the vehicle.
In the present embodiment, the test vehicle is tested within a range of 10% to 100% of the maximum load, and the road running resistance setting is designed with reference to GB 27840-2011.
And S200, compiling a custom PEMS test working condition curve.
Specifically, the customized PEMS test condition in step S200 includes: urban working conditions, suburban working conditions and high-speed working conditions, or any combination thereof.
More specifically, in this example, the test sample vehicle is a non-urban N3 vehicle, that is, a truck with at least 4 wheels or 3 wheels and a maximum total mass greater than 12 tons is selected, and the vehicle operating condition graph is shown in fig. 2. In this embodiment, the test condition of the test sample car constitutes to be in proper order: 20% of urban roads, 25% of suburban roads and 55% of highways, the test condition distribution being expressed in percentage of the total travel time.
More specifically, the dividing principle of urban working conditions, suburban working conditions and high-speed working conditions is to divide the attributes of vehicle running roads according to the running speed of the vehicle, wherein the average running speed of the vehicle on the urban roads is 15-30 km/h; the average vehicle speed of the vehicles running on suburb roads is 45-70 km/h; the average vehicle speed of the vehicles on the expressway is more than 70 km/h.
After step S200, the PEMS device is calibrated, the measurement function of the PEMS device is started, the engine of the test sample vehicle is started, and the vehicle speed of the test sample vehicle is controlled to drive according to the user-defined PEMS test condition selected in step S200.
And step S300, performing a PEMS test.
And step S400, recording the data flow of the engine ECU.
Specifically, in step S400, the engine ECU data stream includes the engine speed, the engine reference torque, the engine specific fuel consumption, the engine actual torque percentage, the engine friction torque percentage, the engine coolant temperature, and the test sample vehicle travel speed.
And step S500, analyzing the concentration of the pollutants collected by the PEMS test.
Specifically, in step S500, the main control integration program of the PEMS device is used to collect and analyze the tail gas of the test sample car.
Step S600, measuring the exhaust flow of the engine.
Specifically, in step S600, the exhaust flow of the engine is obtained through a PEMS exhaust flow meter test.
Step S700, obtaining a quality value of the exhaust pollutants;
specifically, in step S700, aftertreatment software of the PEMS device is invoked to calculate a quality value of exhaust pollutants.
More specifically, in step S700, the mass value of the exhaust pollutants is calculated according to the following formula, assuming that the density of the exhaust pollutants is 1.293kg/m3 at 273K (0 ℃) and 101.3 kpa:
in the formula:NOxt、COtand THCtThe unit is g/s for the instantaneous discharge amount of each gaseous pollutant; NOxconc, COconc and THCconc are instantaneous wet basis concentrations of each gaseous pollutant in the original exhaust gas, and the unit is ppm; gexh is the instantaneous exhaust flow, and the unit is kg/h.
Step S800, calculating the instantaneous work of the engine by using the data flow of the engine ECU. The value of the engine instantaneous work can be used for work base window to emission value calculation of subsequent pollutants.
Specifically, in step S800, the engine instantaneous work is calculated according to the following formula:
Wt＝π×Tt×ntdiv (1.08X 108) (two)
In the formula: wtIs instantaneous work in kWh; t istInstantaneous torque in Nm; n istIs the instantaneous speed in r/min.
Step S900, calculate the specific emission value of the work base window, as shown in fig. 3.
Specifically, the power base window calculation is performed before step S900. The power base window calculation is performed according to the following formula:
the ith power base window period, i.e., t2,i-t1,iIs determined by the following formula:
W(t2,i)-W(t1,i)≥Wref(III)
In the formula: w (t)j,i) From the beginning to tj,iThe engine cycle work over a period of time, in kWh; wrefThe cycle work for the test cycle is reported in kWh;
t2,iis determined by the following formula:
W(t2,i-Δt)-W(t1,i)<Wref≤W(t2,i)-W(t1,i) (IV)
In the formula: delta t refers to the test data acquisition period and does not exceed 1 second; w (t)2,i- Δ t) is from t1,iTo t2,i-engine cycle work in kWh over a period of Δ t.
Specifically, in step S900, the specific emission value of the work base window is calculated according to the following formula:
in the formula: m is the emission mass of a certain pollutant in the work base window, and the unit is mg; w (t)2,i)-W(t1,i) The engine cycle work for the ith window during the test is in kWh. The specific emission values are in mg/kWh.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (11)
1. A PEMS assay method, comprising:
s100, setting road resistance;
s200, compiling a custom PEMS test working condition curve;
s300, performing PEMS test;
s400, recording engine ECU data flow;
s500, analyzing the concentration of the pollutants collected in the PEMS test;
s600, measuring the exhaust flow of the engine;
s700, obtaining the quality value of the exhaust pollutants;
s800, calculating the instantaneous work of the engine by utilizing an engine ECU data flow;
and S900, calculating a specific emission value of the work base window.
2. The PEMS test method according to claim 1, further comprising the step of, in parallel with step S100:
and fixing the vehicle on a chassis dynamometer.
3. The PEMS test method according to claim 1, wherein the method for setting the road resistance in step S100 comprises: the method comprises the steps of calculating the actual coasting resistance value of the vehicle and calculating the actual coasting resistance value of the vehicle.
4. The PEMS test method of claim 1, wherein said custom PEMS test condition of step S200 includes: urban working conditions, suburban working conditions and high-speed working conditions, or any combination of the urban working conditions, the suburban working conditions and the high-speed working conditions.
5. The PEMS test method according to claim 1, wherein after step S200, the PEMS device is calibrated, the measurement function of the PEMS device is started, the engine of the test sample vehicle is started, and the vehicle speed of the test sample vehicle is controlled to drive according to the custom PEMS test condition selected in step S200.
6. The PEMS test method according to claim 1, wherein the engine ECU data stream in step S400 includes engine speed, engine reference torque, engine specific fuel consumption, percent actual engine torque, percent engine friction torque, engine coolant temperature and test sample vehicle travel speed.
7. The PEMS test method according to claim 1, wherein the mass value of exhaust pollutants is calculated in step S700 according to the following equation:
in the formula: noxt、COtAnd THCtInstantaneous discharge of each gaseous pollutant; noxconc、COconcAnd THCconcInstantaneous wet basis concentration of each gaseous pollutant in original exhaust gas; gexhIs the instantaneous exhaust flow.
8. The PEMS test method according to claim 1, wherein the engine instantaneous work is calculated in step S800 according to the following formula:
Wt＝π×Tt×ntdiv (1.08X 108) (two)
In the formula: wtIs instantaneous work; t is a unit oftIs the instantaneous torque; n istIs the instantaneous rotational speed.
9. The PEMS test method of claim 1, wherein a work base window calculation is performed prior to step S900.
10. The PEMS assay of claim 9, wherein the power-based window calculation is performed according to the following equation:
the ith power base window period, i.e., t2,i-t1,iIs determined by the following formula:
W(t2,i)-W(t1,i)≥Wref(III)
In the formula: w (t)j，i) From the beginning to tj,iEngine cycle work over a period of time; w is a group ofrefCycle work for a test cycle; t is t2,iIs determined by the following formula:
W(t2，i-Δt)-W(t1,i)<Wref≤W(t2,i)-W(t1,i) (IV)
In the formula: delta t refers to the test data acquisition period and does not exceed 1 second; w (t)2,i- Δ t) is from t1,iTo t2,i-engine cycle work over a time period of at.
11. The PEMS test method according to claim 1, wherein in step S900, the specific emission value of the work base window is calculated according to the following formula:
in the formula: m is merit base windowThe discharge quality of various pollutants in the mouth; w (t)2,i)-W(t1,i) Is the engine cycle work for the ith window during the test.
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