CN112360636A - GPF service station regeneration point selection calibration method under different environments - Google Patents
GPF service station regeneration point selection calibration method under different environments Download PDFInfo
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- CN112360636A CN112360636A CN202011295141.2A CN202011295141A CN112360636A CN 112360636 A CN112360636 A CN 112360636A CN 202011295141 A CN202011295141 A CN 202011295141A CN 112360636 A CN112360636 A CN 112360636A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
- F02D31/001—Electric control of rotation speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
- F02D37/02—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for one of the functions being ignition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
- F02D41/1475—Regulating the air fuel ratio at a value other than stoichiometry
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
- F02P5/15—Digital data processing
- F02P5/1502—Digital data processing using one central computing unit
- F02P5/1504—Digital data processing using one central computing unit with particular means during a transient phase, e.g. acceleration, deceleration, gear change
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
- F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
-
- 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
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention discloses a method for calibrating regeneration point selection of a GPF service station in different environments, which comprises the following steps: step 1) carrying out a no-load service station regeneration experiment in plain areas, directly carrying out service station regeneration at different air-fuel ratios, rotating speeds and ignition efficiencies, and selecting a qualified regeneration temperature; step 2) carrying out a no-load service station regeneration experiment in a high-temperature area, and selecting a qualified regeneration temperature; step 3) carrying out a no-load service station regeneration experiment in a high altitude area, setting a certain altitude gradient, respectively carrying out experiments with corresponding regeneration temperature, air-fuel ratio, rotating speed and ignition efficiency, and selecting qualified regeneration temperature corresponding to the altitude; and 4) carrying out a no-load service station regeneration experiment in a high and cold area, and selecting a regeneration temperature which is qualified corresponding to the air-fuel ratio, the rotating speed and the ignition efficiency.
Description
Technical Field
The invention relates to a calibration method of a GPF service station, in particular to a regeneration point selection calibration method of the GPF service station in different environments.
Background
Since 7 months 2019, GB 18352.6-2016 "(limit for light-duty emission of automotive pollutants) and methods for measuring the same (sixth stage of china) were implemented in advance in some areas of china, and the emission limit thereof is more stringent, and the particulate emissions of gasoline engines are formally brought into the monitoring range, and in the face of more stringent emission regulations, gasoline direct injection engines are generally subjected to aftertreatment evolution by using gasoline engine particulate traps.
After a particle trap (GPF) is used for a period of time, soot particles can be accumulated on the surface of the GPF to form a coating, so that the amount of the soot particles collected by the GPF is reduced, the exhaust resistance is increased, the output power of an engine is reduced, the oil consumption is increased, and the GPF is required to be regenerated to reduce the soot particles. The active regeneration of the GPF usually needs to judge whether the active regeneration needs to be performed currently according to the carbon loading inside the current GPF. The service station regeneration is one of active regeneration, which needs to actively adjust an engine operation mode to increase exhaust temperature so as to increase the temperature of the GPF, and meanwhile, adopts a lean air-fuel ratio to enable the interior of the GPF to reach a high-temperature oxygen-rich condition. Generally, the exhaust temperature is increased by increasing the engine speed and retarding the ignition. The regeneration calibration point selection of the service station relates to the condition that a plurality of parameters including air-fuel ratio, engine rotating speed, ignition efficiency and the like are influenced by the environment, the influence factors are more, the calibration process is more complex, and aiming at the regeneration point selection calibration of the service station of the gasoline engine particle trap, a quick and effective calibration method is not available in each host factory at present.
Disclosure of Invention
The invention aims to provide a method for calibrating regeneration selection points of GPF service stations in different environments, which solves the problem of difficult calibration of optimal regeneration temperature in the prior art and is suitable for regeneration of GPFs in different environments.
The purpose of the invention is realized as follows: a GPF service station regeneration point selection calibration method under different environments comprises the following steps:
step 1) carrying out a no-load service station regeneration experiment in plain areas, wherein the contents are as follows: the method comprises the steps that carbon accumulation is not carried out on GPF, service station regeneration is directly carried out at different air-fuel ratios, rotating speeds and ignition efficiencies by using a variable control method, and regeneration temperatures corresponding to the air-fuel ratios, the rotating speeds and the ignition efficiencies are selected under the condition that the service station regeneration is at the current selected point according to collected data analysis;
step 2) carrying out a no-load service station regeneration experiment in a high-temperature area, wherein the contents are as follows: carrying out a no-load service station regeneration experiment on the basis of the air-fuel ratio, the rotating speed and the ignition efficiency corresponding to the qualified regeneration temperature in the step 1), and selecting the regeneration temperature corresponding to the qualified air-fuel ratio, the rotating speed and the ignition efficiency;
step 3) carrying out a no-load service station regeneration experiment in the high altitude area, wherein the contents are as follows: carrying out a no-load service station regeneration experiment on the basis of the air-fuel ratio, the rotating speed and the ignition efficiency corresponding to the qualified regeneration temperature in the step 2), setting a certain altitude gradient, respectively testing the air-fuel ratio, the rotating speed and the ignition efficiency corresponding to the regeneration temperature, and selecting the qualified regeneration temperature corresponding to the altitude;
step 4) carrying out a no-load service station regeneration experiment in the alpine region, wherein the contents are as follows: and 3) carrying out a no-load service station regeneration experiment on the basis of the altitude, the air-fuel ratio, the rotating speed and the ignition efficiency corresponding to the qualified regeneration temperature in the step 3), and selecting the regeneration temperature corresponding to the qualified air-fuel ratio, the rotating speed and the ignition efficiency.
As a further limitation of the present invention, if the acceptable regeneration temperatures obtained in step 4) exceed two, the regeneration temperatures having a high air-fuel ratio and a high ignition efficiency are sequentially selected with priority.
As a further limitation of the present invention, the temperature of the support in the regeneration experiment of step 1) is 650 ℃ or higher and 750 ℃ or lower. The temperature of the GPF carrier is too high or too low, the too high temperature can cause the GPF carrier to be over-heated and further burnt out due to the fact that the service station regeneration is triggered when the carbon loading is high, the too low temperature can cause the carrier temperature to be too low and the carbon burning rate to be extremely low, the inbound service station regeneration triggering time is too long, the user waiting time is too long, complaints are caused, or the temperature is too low and the carbon cannot be burnt out at all, so that the GPF is directly blocked and damaged.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention adopts a control variable method, carries out zero-load service station regeneration point selection experiment in each region, selects parameters which can be smoothly carried out by service station regeneration in each region, has simple and convenient method, and adopts the selection sequence principle of plain = > high temperature = > high altitude = > alpine as follows: the plain satisfies the most points, the high temperature satisfies the point one time, and high altitude and high cold are analogized in turn; if the data are not in sequence, more test points need to be made, so that the most accurate data can be obtained through the selection sequence by using as few tests as possible;
2) according to the method, the high-altitude area is used as a judgment basis for the lowest temperature of the regeneration point selection of the service station, so that the obtained temperature data has higher adaptability and universality;
3) the principle followed by the regeneration setpoint of the service station has the following effects: the air-fuel ratio is as large as possible, the oxygen content is increased by increasing the air-fuel ratio, and the regeneration efficiency of the service station is facilitated; the target ignition efficiency is as large as possible, and too low ignition efficiency may cause misfire in a low temperature environment.
Detailed Description
The present invention is further illustrated by the following specific examples.
A GPF service station regeneration point selection calibration method under different environments comprises the following steps:
step one, carrying out a regeneration experiment of an unloaded service station in a plain area, wherein the experiment contents are as follows: carbon accumulation is not carried out on GPF, the service station regeneration is directly carried out at different rotating speed air-fuel ratios, rotating speeds and ignition efficiencies by using a variable control method, and the data are collectedAnalyzing whether the regeneration temperature and the regeneration efficiency of the service station regeneration are met or not under the condition of the current point selection; the following table, in which N1、 N2 、N3For selecting points for rotation speed, λ1、λ2Selecting points for air-fuel ratio, ∈1、ε2、ε3、ε4The selection point is selected for the ignition efficiency (the selection is not limited to the above selection points, and the more the selection points are, the more accurate the temperature data is theoretically, the several selection points are taken as an example in the present embodiment for explanation). Using control variable method to measure regenerated carrier temp. T of service station under different parameters1~T24Representing the measured temperature regenerated by the idle service station under the currently selected parameters. E.g. T1At a rotation speed N1, an air-fuel ratio lambda1Ignition efficiency ε1Under the condition, the carrier temperature when the GPF service station is regenerated; the carrier temperature of GPF in the regeneration process of the service station should be more than 600 ℃, and 650-700 ℃ can be taken as qualified temperature in order to ensure sufficient reaction and no overtemperature phenomenon. If the rough part in the table is the qualified temperature, eliminating the corresponding parameter of the unqualified temperature, thus obtaining 18 combination grid data;
and step two, carrying out a regeneration experiment of the no-load service station in a high-temperature area, and carrying out the regeneration experiment of the no-load service station on the basis of the rotating speed air-fuel ratio, the rotating speed and the ignition efficiency corresponding to the qualified temperature obtained in the step one. The following table, wherein Ta1-Ta18Regenerating the carrier temperature for the service station corresponding to the current parameters of the high-temperature area, corresponding to 18 groups of qualified temperature data in the step one, and eliminating the corresponding parameters of unqualified temperature if the thickened part in the table is qualified temperature, thus obtaining 12 combined grid data;
step three, carrying out the no-load service station regeneration experiment in the high altitude area, and carrying out the step twoCarrying out a no-load service station regeneration experiment on the basis of the rotating speed air-fuel ratio, the rotating speed and the ignition efficiency corresponding to the qualified temperature; simultaneously, a certain altitude gradient is set, and a certain altitude gradient H is set1、H2，H2>H1And setting a temperature gradient for judging the current parameter, performing normal service station regeneration under the environment of the altitude, and selecting the expected altitude as a judgment standard. The following table, wherein Tb1- Tb24Regenerating the carrier temperature for the service station corresponding to the current parameter of the high altitude area, and respectively corresponding 12 combination grid data in the second step and the altitude gradient H1、H2And comparing, and eliminating corresponding parameters of unqualified temperature if the rough part in the table is qualified temperature. For example, at altitude H2For the desired altitude, then only ε4、λ1、N3And ε4、λ2、N3Meets the requirements. The regeneration temperature of the service station is much lower in the high-altitude area compared with that of other areas under the same parameter, and the high-altitude area is generally used as the judgment basis of the lowest regeneration point selection temperature of the service station, so that the high-altitude H is selected22 groups of data of the region are used as qualified data;
step four, performing a no-load service station regeneration experiment in a high and cold area, and performing the no-load service station regeneration experiment on the basis of the rotating speed air-fuel ratio, the rotating speed and the ignition efficiency corresponding to the qualified temperature of the step three; the following table, where Tc1-Tc2And (3) the regeneration carrier temperature of the service station corresponding to the current parameters of the alpine region corresponds to 2 groups of qualified regeneration temperature data in the third step, and if the coarse part in the table is qualified temperature, the corresponding parameters of unqualified temperature are eliminated. To this end, the setpoint can be obtained as ε4、λ1、N3And ε4、λ2、N3In time, the service station regeneration can be smoothly carried out in the different environmental areas;
step five, if the two conditions are met, for example, the situation that epsilon is supposed at this time4、λ1、N3And ε4、λ2、N3The conditions are met, the point selection follows the following principle (1) that the air-fuel ratio is as large as possible, the air-fuel ratio is increased, the oxygen content is increased, and the regeneration efficiency of the service station is facilitated. (2) The target ignition efficiency is as large as possible, and too low ignition efficiency may cause misfire in a low temperature environment.
The invention carries out the regeneration experiment of the no-load service station in different areas, the regeneration experiment of the no-load service station does not need to accumulate carbon compared with the regeneration experiment of real carbon, the steps are simple and convenient, the control variable method experiment can be carried out quickly, meanwhile, the method carries out the experiment in each area, ensures that the regeneration of the service station can be carried out normally in each area under the parameter after the point selection, and ensures certain combustion efficiency, and the principle is as follows: select a suitable operating mode, if all according to tired carbon state down the selection point, can need to spend a large amount of resources, select no-load operating mode after, only need verify tired carbon, because the speed of burning carbon is everywhere unanimous basically, and secondly no-load can not realize, just can not realize under that tired carbon state more.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (3)
1. A GPF service station regeneration point selection calibration method under different environments is characterized by comprising the following steps:
step 1) carrying out a no-load service station regeneration experiment in plain areas, wherein the contents are as follows: the method comprises the steps that carbon accumulation is not carried out on GPF, service station regeneration is directly carried out at different air-fuel ratios, rotating speeds and ignition efficiencies by using a variable control method, and regeneration temperatures corresponding to the air-fuel ratios, the rotating speeds and the ignition efficiencies are selected under the condition that the service station regeneration is at the current selected point according to collected data analysis;
step 2) carrying out a no-load service station regeneration experiment in a high-temperature area, wherein the contents are as follows: carrying out a no-load service station regeneration experiment on the basis of the air-fuel ratio, the rotating speed and the ignition efficiency corresponding to the qualified regeneration temperature in the step 1), and selecting the regeneration temperature corresponding to the qualified air-fuel ratio, the rotating speed and the ignition efficiency;
step 3) carrying out a no-load service station regeneration experiment in the high altitude area, wherein the contents are as follows: carrying out a no-load service station regeneration experiment on the basis of the air-fuel ratio, the rotating speed and the ignition efficiency corresponding to the qualified regeneration temperature in the step 2), setting a certain altitude gradient, respectively testing the air-fuel ratio, the rotating speed and the ignition efficiency corresponding to the regeneration temperature, and selecting the qualified regeneration temperature corresponding to the altitude;
step 4) carrying out a no-load service station regeneration experiment in the alpine region, wherein the contents are as follows: and 3) carrying out a no-load service station regeneration experiment on the basis of the altitude, the air-fuel ratio, the rotating speed and the ignition efficiency corresponding to the qualified regeneration temperature in the step 3), and selecting the regeneration temperature corresponding to the qualified air-fuel ratio, the rotating speed and the ignition efficiency.
2. The method for calibrating the regeneration point selection of the GPF service station under different environments as claimed in claim 1, wherein if the qualified regeneration temperatures obtained in step 4) exceed two regeneration temperatures, the regeneration temperatures with higher air-fuel ratio and higher ignition efficiency are selected in turn.
3. The method for calibrating the regeneration setpoint of the GPF service station under different environments as claimed in claim 1, wherein the temperature of the carrier in the regeneration experiment of step 1) is above 650 ℃, below 750 ℃, neither too high nor too low, too high may cause the GPF carrier to be over-heated and then burn out the GPF carrier due to the regeneration of the service station triggered by a high carbon loading, and too low may cause the GPF carrier to be over-heated and thus burn out the GPF carrier due to too low temperature of the carrier and an extremely low carbon burning rate, which may cause the regeneration time of the service station triggered by the entering station to be over-long and thus cause complaints due to an excessively long waiting time of a user or cause the GPF to be directly blocked and damaged due to too low temperature and no carbon burning out.
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| CN113464341A (en) * | 2021-06-28 | 2021-10-01 | 东风汽车集团股份有限公司 | Method for calculating basic ignition efficiency of engine, computer device and storage medium |
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