CN105649755B - A kind of method for determining Turbocharged Gasoline Engine scavenging ratio - Google Patents
A kind of method for determining Turbocharged Gasoline Engine scavenging ratio Download PDFInfo
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- CN105649755B CN105649755B CN201511026012.2A CN201511026012A CN105649755B CN 105649755 B CN105649755 B CN 105649755B CN 201511026012 A CN201511026012 A CN 201511026012A CN 105649755 B CN105649755 B CN 105649755B
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- 230000002000 scavenging effect Effects 0.000 title claims abstract description 102
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000001419 dependent effect Effects 0.000 claims abstract description 5
- 238000012360 testing method Methods 0.000 claims description 18
- 238000002485 combustion reaction Methods 0.000 abstract description 8
- 238000010276 construction Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B2037/122—Control of rotational speed of the pump
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Supercharger (AREA)
Abstract
The invention discloses a kind of method for determining Turbocharged Gasoline Engine scavenging ratio, gathers CO, CO2 value x of the Turbocharged Gasoline Engine under non-scavenging operating mode firsti、yiWith excess air coefficient value in engine exhaustThen willAs independent variable, ziCubic polynomial fitting is carried out as dependent variable, is obtained under non-scavenging operating modeThe functional relation between CO/CO2, then gather under scavenging operating mode excess air coefficient value in CO, CO2 value X, Y and engine exhaustX, Y are substituted into the functional relation and calculate out target operating conditionFinally, according toWithCalculate the scavenging ratio under scavenging operating mode.The present invention can quickly determine the scavenging ratio of Turbocharged Gasoline Engine, shorten the engine combustion construction cycle, improve operating efficiency.
Description
Technical Field
The invention relates to an engine scavenging technology, in particular to a method for determining the scavenging rate of a turbocharged gasoline engine.
Background
The scavenging technology is applied to the turbocharged gasoline engine, so that the residual waste gas in a cylinder can be reduced, the temperature of a combustion chamber can be reduced, the fresh charge can be increased, and the scavenging technology has obvious effects on improving the low-speed torque of the gasoline engine and improving the power lag phenomenon caused by the fact that the engine is provided with a turbocharger; on the other hand, however, the scavenging technique is harsh in use condition, and if the scavenging technique is not well used, serious adverse effects can be caused: if the scavenging rate is not controlled well, the oxidation reaction in the tail gas is difficult to be carried out smoothly, and the adverse effects of increased NOx emission, overhigh exhaust temperature, accelerated aging of the three-way catalyst and the like are caused.
The scavenging technology of the supercharged engine is a technology for accurately controlling the valve timing of a variable valve at a certain rotating speed and load; in the combustion development process, the scavenging of the engine is passively controlled based on the exhaust temperature or the exhaust air-fuel ratio, namely when the exhaust temperature or the exhaust air-fuel ratio exceeds a certain limit value, the valve overlap angle is adjusted to determine that the scavenging rate is in a control range; up to now, researchers at home and abroad have conducted extensive studies on scavenging, wherein the swiss invention discloses "a scavenging monitoring system and method for monitoring process parameters in a scavenging process", patent numbers: (ZL 200910134799.2), disclose a scavenge performance monitoring system and method for two-stroke diesel engine by installing two oxygen sensors on the cylinder wall, but this method cannot be applied to four-stroke gasoline engine; U.S. invention patent "method for determining and compensating for engine scavenging", patent No.: (ZL 201210428273.7) discloses a method for determining cylinder scavenging through volumetric efficiency of an engine, and the method can only test a stable working condition and cannot accurately reflect the change condition of the scavenging rate under a transient working condition; whereas in almost all papers the scavenging performance is passively evaluated in terms of exhaust temperature, NOx and CO content in the exhaust. Therefore, the prior art has the defects of passive control, low accuracy and the like in the prior art.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for determining the scavenging rate of a turbo-charged gasoline engine aiming at the defects in the background technology so as to quickly and accurately determine the scavenging rate of the turbo-charged gasoline engine.
The invention adopts the following technical scheme for solving the technical problems:
a method of determining the scavenging rate of a turbocharged gasoline engine comprising the steps of:
step 1), collecting CO and CO2 values x of a turbocharged gasoline engine under the non-scavenging working conditions of the rotating speed of 1500rpm to 3000rpm and the load factor of 80 percent to 100 percent i 、y i Andvalue z i I =1,2, \ 8230, n is the number of working points,the excess air coefficient in the engine exhaust under the non-scavenging working condition;
step 2), mixingAs an independent variable, z i As dependent variable, a cubic polynomial fit is performedObtaining the working condition of non-scavengingAnd CO/CO2 as a function of the formula:
wherein z represents the in-cylinder excess air ratioA value;the ratio of CO and CO2 in the exhaust gas is expressed; a is a 0 、a 1 、a 2 、a 3 Respectively representing variable coefficients of the fitting function;
step 3) collecting values X, Y and Y of CO and CO2 under scavenging working conditionsThe value Z is a function of the measured value,the coefficient of excess air in the exhaust of the engine under the scavenging working condition;
step 4), substituting the values X and Y of CO and CO2 collected in the step 3) under the scavenging working condition into the fitting polynomial in the step 2)Obtaining a target working condition
Step 5) testing the values collected in the step 3) under the scavenging working conditionAnd the target working condition obtained in the step 4)Substituting the following formula to calculate the scavenging rate SR under the scavenging working condition:
as a further optimization scheme of the method for determining the scavenging rate of the turbocharged gasoline engine, the rotating speed interval in the step 1) is more than or equal to 200rpm, and the number n of working points is more than or equal to 5.
Parameters under scavenging conditionsBased on the fact that the ratio of CO to CO2 in the scavenging working condition is substituted into the non-scavenging working conditionAnd the ratio of CO to CO 2.
When the rotating speed of the engine is lower than 3000rpm and the excess air coefficient lambda is between 0.85 and 0.95, the ratio of CO and CO2 and lambda are in a linear relation, and the ratio of CO and CO2 under the scavenging working condition is substituted into the ratio of CO and CO2 and the ratio of CO and CO2 under the non-scavenging working conditionThe fitted formula can calculate the scavenging condition in the cylinder under the condition that the rotating speed of the engine is lower than 3000rpm and the excess air coefficient lambda is between 0.85 and 1.05Finally will calculateValue and test ventingAnd substituting the test into a scavenging rate calculation formula to obtain the scavenging rate under the scavenging working condition.
Compared with the prior art, the technical scheme adopted by the invention has the following technical effects:
1. the scavenging rate of the turbocharged gasoline engine can be quickly determined, and data can be quickly and accurately provided for engine research personnel;
2. the situation that scavenging is passively controlled according to parameters such as exhaust temperature, exhaust excess air coefficient and the like at present is changed, so that the combustion development period of the engine is shortened, and the working efficiency is improved.
Drawings
FIG. 1 is a schematic view of the installation location of the CO, CO2 tester and lambda tester of the present invention;
FIG. 2 is a flow chart of the working steps of the present invention.
In the figure, a 1-CO and CO2 tester, a 2-serial port RS 232-USB, a 3-steel pipe, a 4-PC, a 5-lambda tester, a 6-wide-range linear oxygen sensor, a 7-supercharger turbine, an 8-exhaust manifold and a 9-turbocharging gasoline engine are arranged.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings as follows:
referring to fig. 1, in order to determine the scavenging rate, the present invention collects data through a test device comprising a CO, CO2 tester, a wide-area linear oxygen sensor, a lambda tester, and a PC;
a gas collecting pipeline of the CO and CO2 tester is connected with a steel pipe welded on a front exhaust main pipe of the turbocharger turbine, and the CO and CO2 tester is connected with a PC (personal computer) through a serial port RS 232-USB (universal serial bus) port;
the wide-range linear oxygen sensor is arranged on the outer side of a front exhaust manifold of a turbine of the turbocharger, and is connected with a lambda tester which is electrically connected with a PC through a serial port RS 232-USB port;
the PC is electrically connected with the CO and CO2 tester and the lambda tester through the serial port RS 232-USB port respectively, receives data transmitted by the CO and CO2 tester and the lambda tester, performs processing operation, and displays the calculated scavenging rate.
And testing a CO and CO2 value machine and an excess air coefficient lambda value of the supercharged engine at the rotating speed of less than 3000rpm by using a CO and CO2 tester and a lambda tester, wherein the CO and CO2 tester and the lambda tester respectively convert the serial port RS232 into a USB port and transmit test data to a PC. In a PC (personal computer), MATLAB (matrix laboratory) software is used for firstly fitting the ratio of CO and CO2 under the non-scavenging working condition and the excess air coefficient under the non-scavenging working conditionAnd (3) substituting the ratio of CO and CO2 tested under the scavenging working condition into the fitted formula to calculate the excess air coefficient in the cylinder under the scavenging working conditionWill finally calculateAnd testingSubstituting the scavenging rate into a scavenging rate calculation formula to obtain the scavenging rate, and displaying the scavenging rate on a PC display screen to provide help for combustion developers of the supercharged engine.
As shown in FIG. 2, in combination with the supercharged engine scavenging rate testing device, the method for determining the scavenging rate of the turbocharged gasoline engine provided by the invention specifically comprises the following steps:
step 1) of performing a step of, CO, CO2 and CO2 under non-scavenging working conditionData acquisition, firstly, testing the values x of CO and CO2 of the turbocharged gasoline engine under the non-scavenging working conditions of the rotating speed of 1500rpm to 3000rpm and the load rate of 80 percent to 100 percent by a CO and CO2 tester and a lambda tester i 、y i Andvalue z i N, the tested data are respectively transmitted into a PC machine from a serial port RS232 to USB ports 2 and 7, and the number n of the suggested working condition points is more than or equal to 5 in order to ensure the measurement precision;the excess air ratio in the exhaust gas of the engine under the non-scavenging working condition.
Under the non-scavenging working condition, because the scavenging phenomenon does not exist in the combustion chamber of the engine, the excess air coefficient in the combustion chamber is equal to the excess air coefficient in the front exhaust pipe of the three-way catalystThus there are Is the excess air ratio in the engine combustion chamber.
Step 2), calibrating a PC program, and convertingAs the independent variable, there is a variable,i =1,2, \ 8230n as dependent variable, a cubic polynomial fit is performedObtaining the working condition of non-scavengingAnd CO/CO2 as a function of the formula:
in the formula: z represents the in-cylinder excess air ratioA value;representing the ratio of CO and CO2 in the exhaust gas; a is a 0 、a 1 、a 2 、a 3 Respectively representing the variable coefficients of the fitting function;
performing a cubic polynomial fit may utilize MATLAB software.
Step 3), collecting the values X, Y and of CO and CO2 under the scavenging working conditionValue of,testing X, Y and Y of the turbocharged gasoline engine under the scavenging working condition by using a CO and CO2 tester and a lambda meter 5The value, and transmit the data gathered to PC synchronously; wherein,the coefficient of excess air in the exhaust of the engine under the scavenging working condition; at this time, because the engine adopts scavenging technology, the excess air coefficient in the cylinder
Step 4) under the scavenging working conditionCalculating, substituting the test data X and Y in the step three into the fitting polynomial in the step twoObtaining a target operating conditionNamely:
step 5), calculating the scavenging rate under the scavenging working condition, and testing the value under the scavenging working conditionAnd a calculated valueSubstituting into a scavenging rate calculation formula:
and calculating to obtain the scavenging rate SR under the scavenging working condition.
Determining parameters under scavenging working conditions in calculation of scavenging rate of turbocharged gasoline engineBased on the fact that the ratio of CO to CO2 in the scavenging working condition is substituted into the non-scavenging working conditionFitting multiple functions with the ratio of CO and CO 2.
A specific example is given below according to the above steps:
step 1), testing a non-scavenging working condition by combining an experimental device, selecting two working conditions, testing CO, CO2 and excess air coefficients at 2000rpm/100N.m and 1500rpm/80N.m, and obtaining data shown in table 1:
step 2), calibrating a PC program, and convertingAs the independent variable, there is a variable,as a dependent variable, a cubic polynomial fit was performed using MATLAB software — -Namely:
>>z i ＝0.99,0.98,0.96,0.94,0.92,0.9,0.85；
as a result: -0.1652 0.4587-0.5374 1.0233
Then not scavenging conditionAnd CO/CO2 as a function of the formula:
step 3), collecting the values X, Y and of CO and CO2 under the scavenging working conditionThe values of the CO and the CO2 under the scavenging working condition of the turbocharged gasoline engine are tested by a CO and CO2 tester and a lambda meterThe value is obtained, and the acquired data is synchronously transmitted to a PC; wherein,a value representing the excess air factor in the engine exhaust under scavenging conditions; at this time, since the engine adopts the scavenging technique, the excess air coefficient in the cylinder
Step 4), under the scavenging working conditionCalculating, substituting the test data X and Y in the step three into the fitting polynomial in the step twoObtaining a target operating conditionTo obtain
Step 5), calculating the scavenging rate under the scavenging working condition, and testing the value under the scavenging working conditionAnd the calculated valueSubstituting into a scavenging rate calculation formula:
obtaining:
it will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A method of determining the scavenging rate of a turbocharged gasoline engine comprising the steps of:
step 1), collecting CO and CO2 values x of a turbocharged gasoline engine under the non-scavenging working conditions of the rotating speed of 1500rpm to 3000rpm and the load factor of 80 percent to 100 percent i 、y i Andvalue z i I =1,2, \ 8230, n is the number of working points,the excess air coefficient in the engine exhaust under the non-scavenging working condition;
step 2) of mixingAs an independent variable, z i As dependent variable, a cubic polynomial fit is performedObtaining the working condition of non-scavengingAnd CO/CO2 as a function of the formula:
wherein z represents the in-cylinder excess air ratioA value;the ratio of CO and CO2 in the exhaust gas is expressed; a is a 0 、a 1 、a 2 、a 3 Respectively representing the variable coefficients of the fitting function;
step 3), collecting the values X, Y and of CO and CO2 under the scavenging working conditionThe value of Z is such that,the excess air coefficient in the engine exhaust under the scavenging working condition;
step 4), substituting the values X and Y of CO and CO2 collected in the step 3) under the scavenging working condition into the fitting polynomial in the step 2)Obtaining a target operating condition
Step 5) testing the values collected in the step 3) under the scavenging working conditionAnd the target working condition obtained in the step 4)Substituting the following formula to calculate the scavenging rate SR under the scavenging working condition:
2. the method for determining the scavenging rate of the turbocharged gasoline engine according to claim 1, wherein the rotational speed interval in step 1) is greater than or equal to 200rpm, and the number of operating points n is greater than or equal to 5.
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| CN109883719B (en) * | 2019-02-27 | 2021-01-08 | 中国第一汽车股份有限公司 | Scavenging amount measuring method for supercharged direct injection gasoline engine |
| CN111140351A (en) * | 2019-12-13 | 2020-05-12 | 天津大学 | Two-stroke engine scavenging efficiency testing system and method adopting in-cylinder sampling method |
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| CN103348117A (en) * | 2011-02-07 | 2013-10-09 | 日产自动车株式会社 | Control device for internal combustion engine equipped with turbocharger |
| CN105121242A (en) * | 2013-03-07 | 2015-12-02 | 大众汽车有限公司 | Method for operating a hybrid vehicle |
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| JP2013024203A (en) * | 2011-07-25 | 2013-02-04 | Toyota Motor Corp | Control device of direct injection internal combustion engine with supercharger |
| JP2013031407A (en) * | 2011-08-02 | 2013-02-14 | Kurei Okinawa:Kk | Refined soy sauce vinegar and method of manufacturing the same |
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| CN103348117A (en) * | 2011-02-07 | 2013-10-09 | 日产自动车株式会社 | Control device for internal combustion engine equipped with turbocharger |
| CN105121242A (en) * | 2013-03-07 | 2015-12-02 | 大众汽车有限公司 | Method for operating a hybrid vehicle |
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