CN117989005A - Method and device for determining ignition temperature of catalytic oxidizer and electronic equipment - Google Patents
Method and device for determining ignition temperature of catalytic oxidizer and electronic equipment Download PDFInfo
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- CN117989005A CN117989005A CN202410242428.0A CN202410242428A CN117989005A CN 117989005 A CN117989005 A CN 117989005A CN 202410242428 A CN202410242428 A CN 202410242428A CN 117989005 A CN117989005 A CN 117989005A
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- 238000000034 method Methods 0.000 title claims abstract description 75
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 46
- 239000007800 oxidant agent Substances 0.000 title claims abstract description 46
- 230000001052 transient effect Effects 0.000 claims abstract description 138
- 239000000446 fuel Substances 0.000 claims description 58
- 238000002347 injection Methods 0.000 claims description 49
- 239000007924 injection Substances 0.000 claims description 49
- 229930195733 hydrocarbon Natural products 0.000 claims description 38
- 239000004215 Carbon black (E152) Substances 0.000 claims description 37
- 150000002430 hydrocarbons Chemical class 0.000 claims description 34
- 238000004590 computer program Methods 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000010586 diagram Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 53
- 239000000243 solution Substances 0.000 description 9
- 238000011156 evaluation Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- -1 hydrocarbon HC Chemical class 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
-
- 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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- 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
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention provides a method and a device for determining the ignition temperature of a catalytic oxidizer and electronic equipment, wherein the method comprises the following steps: acquiring a plurality of airspeeds and a plurality of inlet temperatures corresponding to a catalytic oxidizer DOC; the following operations are performed for each airspeed: determining transient operating points corresponding to a plurality of inlet temperatures respectively at airspeed; in the process of controlling the engine to run according to the target transient operating points, determining the thermal efficiency corresponding to each target transient operating point, determining the inlet temperature corresponding to the target thermal efficiency in all the thermal efficiencies as the ignition temperature of the DOC under the airspeed, and the target transient operating points belong to the transient operating points. According to the method, based on different DOC inlet temperatures at airspeed, a plurality of target transient operating points are determined, and then target thermal efficiency is determined, and the DOC inlet temperature corresponding to the target thermal efficiency is determined as the light-off temperature of the DOC at airspeed, wherein the light-off temperature is accurate, and the light-off capability of the DOC can be effectively represented.
Description
Technical Field
The invention relates to the technical field of exhaust emission aftertreatment of diesel engines, in particular to a method and a device for determining the ignition temperature of a catalytic oxidizer and electronic equipment.
Background
For an engine (such as a national six diesel engine) aftertreatment system, the catalytic oxidizer (Diesel Oxidation Catalyst, DOC) plays a key role in ignition in the active regeneration process, namely, the fuel injected into the exhaust pipe is ignited, so that the fuel injected into the exhaust pipe can be smoothly combusted. In order to ensure the light-off performance of the DOC, the light-off capability of the DOC needs to be tested on a bench.
The existing DOC ignition ability evaluation method comprises DOC steady-state point test evaluation and ignition time test evaluation. The former is to evaluate the DOC light-off capability based on the conversion efficiency of Hydrocarbon (HC), but the HC conversion efficiency is difficult to represent an effective temperature rise, so that the evaluation result of the DOC light-off capability is not accurate enough; the DOC ignition capability is evaluated according to the ignition time, but the ignition time is easily influenced by conditions of manually adjusting the oil injection step length, the airspeed and the like, and the DOC ignition capability is difficult to effectively characterize, so that the evaluation result of the DOC ignition capability is inaccurate.
In summary, the above methods have certain limitations, and it is difficult to accurately evaluate the light-off capability of the DOC.
Disclosure of Invention
The invention provides a method, a device and electronic equipment for determining the ignition temperature of a catalytic oxidizer, which are used for solving the defect that the existing DOC ignition capability test method has certain limitation and is difficult to accurately evaluate the ignition capability of a DOC.
The invention provides a method for determining the ignition temperature of a catalytic oxidizer, which comprises the following steps:
Acquiring a plurality of airspeeds and a plurality of inlet temperatures corresponding to a catalytic oxidizer DOC;
The following operations are performed for each airspeed: determining transient operating points corresponding to the inlet temperatures respectively at the airspeed; in the process of controlling the engine to run according to a plurality of target transient operating points, determining the thermal efficiency corresponding to each of the target transient operating points, and determining the inlet temperature corresponding to the target thermal efficiency in all the thermal efficiencies as the light-off temperature of the DOC under the airspeed, wherein the target transient operating points belong to the transient operating points.
According to the method for determining the ignition temperature of the catalytic oxidizer, provided by the invention, the plurality of airspeeds are positioned in a preset airspeed range; the plurality of inlet temperatures are within a preset temperature range and are ordered from low to high.
According to the method for determining the light-off temperature of the catalytic oxidizer provided by the invention, the determining the thermal efficiency corresponding to each of the target transient operating points comprises the following steps: and determining the thermal efficiency corresponding to each of the target transient operating points according to the fuel injection quantity and the exhaust gas flow corresponding to the DOC.
According to the method for determining the light-off temperature of the catalytic oxidizer provided by the invention, the transient operating points corresponding to the inlet temperatures respectively at the airspeed are determined, and the method comprises the following steps: determining a plurality of airspeed contours corresponding to the DOC according to the plurality of airspeeds and a universal characteristic diagram of the engine; determining a plurality of inlet temperature contour lines corresponding to the DOC according to the inlet temperatures and the universal characteristic curve graph; for each airspeed contour, determining a plurality of intersections of the airspeed contour and the plurality of inlet temperature contours as the plurality of transient operating points.
According to the method for determining the light-off temperature of the catalytic oxidizer provided by the invention, the thermal efficiency corresponding to each of the target transient operating points is determined according to the fuel injection quantity and the exhaust gas flow corresponding to the DOC, and the method comprises the following steps: determining the fuel injection quantity according to the predicted concentration corresponding to the hydrocarbon at the DOC inlet and the exhaust gas flow; the following operations are performed for each target transient operating point: and determining the thermal efficiency corresponding to the target transient operating point according to the fuel injection quantity, the exhaust gas flow and the inlet temperature corresponding to the target transient operating point.
According to the method for determining the light-off temperature of the catalytic oxidizer provided by the invention, the determining the thermal efficiency corresponding to the target transient operating point according to the fuel injection quantity, the exhaust gas flow and the inlet temperature corresponding to the target transient operating point comprises the following steps: determining a first thermal coefficient based on the inlet temperature; determining a second thermal coefficient according to the outlet temperature of the DOC; and determining the thermal efficiency corresponding to the target transient operating point according to the fuel injection quantity, the exhaust gas flow, the inlet temperature, the outlet temperature, the first thermal coefficient, the second thermal coefficient and the low heat value of the fuel.
According to the method for determining the light-off temperature of the catalytic oxidizer provided by the invention, after the fuel injection quantity is determined, the method further comprises the following steps: acquiring a first measured concentration corresponding to the hydrocarbon at the outlet of the DOC acquired by the sampling instrument; determining a second measured concentration corresponding to the hydrocarbon at the DOC inlet according to the fuel injection quantity and the exhaust gas flow; and determining the conversion efficiency corresponding to the hydrocarbon according to the first measured concentration and the second measured concentration.
The invention also provides a device for determining the ignition temperature of the catalytic oxidizer, which comprises:
The acquisition module is used for acquiring a plurality of airspeeds and a plurality of inlet temperatures corresponding to the catalytic oxidizer DOC;
The processing module is used for executing the following operations for each airspeed: determining transient operating points corresponding to the inlet temperatures respectively at the airspeed; in the process of controlling the engine to run according to a plurality of target transient operating points, determining the thermal efficiency corresponding to each of the target transient operating points, and determining the inlet temperature corresponding to the target thermal efficiency in all the thermal efficiencies as the light-off temperature of the DOC under the airspeed, wherein the target transient operating points belong to the transient operating points.
The invention also provides electronic equipment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the ignition temperature determining method of the catalytic oxidizer when executing the program.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of determining the light-off temperature of a catalytic oxidizer as described in any one of the above.
The invention also provides a computer program product comprising a computer program which, when executed by a processor, implements a method of determining the light-off temperature of a catalytic oxidizer as described in any one of the above.
According to the method and the device for determining the ignition temperature of the catalytic oxidizer and the electronic equipment, the multiple airspeeds and the multiple inlet temperatures corresponding to the DOC of the catalytic oxidizer are obtained; the following operations are performed for each airspeed: determining transient operating points corresponding to a plurality of inlet temperatures respectively at airspeed; in the process of controlling the engine to run according to the target transient operating points, determining the thermal efficiency corresponding to each target transient operating point, determining the inlet temperature corresponding to the target thermal efficiency in all the thermal efficiencies as the ignition temperature of the DOC under the airspeed, and the target transient operating points belong to the transient operating points. According to the method, based on different DOC inlet temperatures at airspeed, a plurality of target transient operating points are determined, the thermal efficiencies corresponding to the target transient operating points are further determined, the target thermal efficiency is determined from all the thermal efficiencies, the DOC inlet temperature corresponding to the target thermal efficiency is determined to be the ignition temperature of the DOC at airspeed, the ignition temperature is accurate, the ignition capability of the DOC can be effectively represented, and the accurate assessment of the ignition capability of the DOC is facilitated.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for determining the light-off temperature of a catalytic oxidizer provided by the invention;
FIG. 2 is a schematic diagram of a second objective universal characteristic provided by the present invention;
FIG. 3 is a schematic representation of the light-off curve at a certain airspeed provided by the present invention;
FIG. 4 is a schematic view of the structure of the device for determining the light-off temperature of the catalytic oxidizer according to the present invention;
fig. 5 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
For a better understanding of the embodiments of the present invention, first, the background art will be described in detail:
In an engine (e.g., a state six diesel engine) aftertreatment system, DOC plays three main roles:
In the first aspect, when the gas after engine combustion passes through the DOC honeycomb carrier, the gas is adsorbed by platinum group metal coated on the surface of the carrier, and meanwhile, the platinum group metal is used as a catalyst to oxidize and burn carbon monoxide and hydrocarbon in the engine tail gas together with the adsorbed oxygen to generate carbon dioxide and water which have little influence on the environment;
In the second aspect, the DOC plays a key role of ignition in the active regeneration process, and the fuel injected into the exhaust pipe is ignited to ensure that the fuel injected into the exhaust pipe can be smoothly combusted;
In a third aspect, the DOC may oxidize nitric oxide generated after engine combustion to nitrogen dioxide, increasing the reaction rate of Selective Catalytic Reduction (SCR), while nitrogen dioxide may react with particulates in a diesel particulate trap (Diesel Particulate Filter, DPF), increasing the ability to passively regenerate.
The existing DOC ignition ability evaluation method comprises the following two steps: firstly, DOC steady-state point test evaluation, namely, adjusting the airspeed and exhaust temperature of an engine to enable the temperature of an inlet of the DOC (which can be called as T4 temperature) to reach target requirements, measuring each gas component before and after the DOC, respectively calculating HC conversion efficiency at each temperature and each airspeed, evaluating the DOC ignition capacity according to the HC conversion efficiency, wherein the heat value of diesel generally comprises heat loss, HC escape and exhaust gas temperature rise; secondly, testing and evaluating the ignition time, setting boundary conditions according to requirements, adjusting corresponding working conditions, adjusting the opening degree of a throttle valve, closing post-injection, stabilizing the T4 temperature and exhaust flow, then entering a manual oil injection mode, gradually increasing the oil injection quantity to the DOC outlet temperature (which can be called as T5 temperature) and stabilizing at the target ignition temperature, calculating the ignition time required for the T5 temperature to reach the target ignition temperature from the start of oil injection to the T5 temperature, and indicating that the DOC ignition capacity is stronger when the ignition time is shorter.
In order to solve the problems, the embodiment of the invention provides a method, a device and an electronic device for determining the ignition temperature of a catalytic oxidizer, which are used for determining a plurality of target transient operating points based on different DOC inlet temperatures under airspeed, further determining the thermal efficiency corresponding to each of the plurality of target transient operating points, determining the target thermal efficiency from all the thermal efficiencies, determining the DOC inlet temperature corresponding to the target thermal efficiency as the ignition temperature of the DOC under airspeed, wherein the ignition temperature is more accurate, can effectively represent the ignition capability of the DOC, and is beneficial to accurately evaluating the ignition capability of the DOC.
It should be noted that, the execution body according to the embodiment of the present invention may be a light-off temperature determining device of a catalytic oxidizer, or may be an electronic device, and optionally, the electronic device may include: computer, mobile terminal, wearable device, etc.
The following further describes embodiments of the present invention by taking an electronic device as an example.
As shown in fig. 1, a flow chart of a method for determining a light-off temperature of a catalytic oxidizer according to the present invention may include:
101. and acquiring a plurality of airspeeds and a plurality of inlet temperatures corresponding to the catalytic oxidizer DOC.
Where airspeed refers to the ratio of the flow of engine exhaust through the DOC (i.e., exhaust flow) to the catalyst volume. The space velocity is a parameter for measuring the residence time of the gas in the catalyst bed, and the larger the space velocity is, the shorter the contact time of the gas and the catalyst is, and the larger the influence on the post-treatment process is. Airspeed units are per hour (h -1).
The inlet temperature (DOC inlet temperature) is the T4 temperature referred to above.
The electronic equipment firstly acquires a plurality of airspeeds and a plurality of inlet temperatures corresponding to the DOC so as to accurately determine the ignition temperature of the DOC later.
In some embodiments, the plurality of airspeeds is within a preset airspeed range; the plurality of inlet temperatures are within a predetermined temperature range and are ordered from low to high.
Alternatively, the preset airspeed range and the preset temperature range may be set before the electronic device leaves the factory, or may be user-defined, and are generally set according to an empirical value, for example, the preset airspeed range is set to [6W,20W ], where the unit W represents ten thousand. The preset temperature range is set to [175 ℃,450 ℃ ], wherein the unit of ℃ represents degrees celsius.
In the process of acquiring a plurality of airspeeds and a plurality of inlet temperatures corresponding to the DOC, in order to cover the universal characteristic of the engine as much as possible, the electronic device acquires a plurality of airspeeds meeting a preset airspeed range, for example, acquires 5 airspeeds meeting a preset airspeed range [6w,20w ], and the 5 airspeeds are respectively: 6W airspeed, 8W airspeed, 10W airspeed, 14W airspeed, and 16W airspeed; meanwhile, the electronic device obtains a plurality of inlet temperatures satisfying a preset temperature range and ordered from low to high, for example, obtains a plurality of inlet temperatures satisfying a preset temperature range [175 ℃,450 ℃ and ordered from low to high, and the plurality of inlet temperatures are respectively: 175 ℃, 200 ℃, 225 ℃, 250 ℃, 275 ℃, 300 ℃, 325 ℃, … ℃,450 ℃.
102. The following operations are performed for each airspeed: determining transient operating points corresponding to a plurality of inlet temperatures respectively at airspeed; in the process of controlling the engine to run according to the target transient operating points, determining the thermal efficiency corresponding to each target transient operating point, determining the inlet temperature corresponding to the target thermal efficiency in all the thermal efficiencies as the ignition temperature of the DOC under the airspeed, and the target transient operating points belong to the transient operating points.
The thermal efficiency refers to the thermal efficiency of the hydrocarbon HC.
Alternatively, the target thermal efficiency may be 50% thermal efficiency (which may be referred to as T50 thermal efficiency).
The following operations are performed for each airspeed: the electronic equipment firstly determines transient operating points corresponding to a plurality of inlet temperatures under the airspeed, the electronic equipment can select a preset number of target transient operating points from the transient operating points, then the engine is controlled to slowly operate according to the preset number of target transient operating points, in the operation process of the engine, the thermal efficiency corresponding to the preset number of target transient operating points is determined, the target thermal efficiency (such as T50 thermal efficiency) is determined from all the thermal efficiencies, and then the DOC inlet temperature (namely T4 temperature) corresponding to the target thermal efficiency is determined as the ignition temperature of the DOC under the airspeed, the ignition temperature is more accurate, the ignition capability of the DOC can be effectively represented, and the ignition capability of the DOC is helped to be accurately estimated.
Optionally, the preset number may be set before the electronic device leaves the factory, or may be user-defined, and is generally set according to an empirical value, for example, the preset number is set to any positive integer between 40 and 50, or may be set to 40 or 50.
In some embodiments, the electronic device determining transient operating points for each of a plurality of inlet temperatures at airspeed may include: the electronic equipment determines a plurality of airspeed contours corresponding to the DOC according to the universal characteristic curves of the plurality of airspeeds and the engine; determining a plurality of inlet temperature contour lines corresponding to the DOC according to the inlet temperatures and the universal characteristic curve graphs; for each airspeed contour, the electronic device determines a plurality of intersections of the airspeed contour and a plurality of inlet temperature contours as a plurality of transient operating points.
The universal characteristic curve is a curve for comprehensively representing the performance of the engine, usually takes the rotating speed as an abscissa, takes the load (such as torque) as an ordinate, and has a plurality of curves respectively representing the engine performance parameters such as fuel consumption rate, power, exhaust temperature, exhaust smoke and the like under different rotating speeds and loads.
In the process of determining the transient operating point, the electronic equipment determines a plurality of airspeed contours corresponding to the DOC according to the acquired airspeeds and the universal characteristic curve of the engine, and simultaneously determines a plurality of inlet temperature contours corresponding to the DOC according to the acquired inlet temperatures and the universal characteristic curve of the engine, namely, converts the universal characteristic curve of the engine into a first target universal characteristic curve comprising the airspeed contours and the inlet temperature contours. Based on this, in the first target universal characteristic map, for each airspeed contour, the electronic device determines a plurality of intersections of the airspeed contour with a plurality of inlet temperature contours as a plurality of transient operating points.
Optionally, because the airspeed and the exhaust gas flow rate may be switched, in the process of determining the transient operating point, the electronic device may also switch the plurality of airspeed contours to a plurality of exhaust gas flow rate contours, and switch the universal characteristic map of the engine to a second target universal characteristic map including a plurality of exhaust gas flow rate contours and a plurality of inlet temperature contours in combination with the plurality of inlet temperature contours. Based on this, in the second target universal characteristic map, the electronic device determines, for each exhaust gas flow contour, a plurality of intersections of the exhaust gas flow contour and a plurality of inlet temperature contours as a plurality of transient operating points.
Exemplary, as shown in fig. 2, is a schematic diagram of a second objective universal characteristic curve provided by the present invention. In the figure, the abscissa indicates the rotational speed (speed) of the engine in revolutions per minute (rpm); the ordinate is torque of the engine (torque), in feet-pounds (ft-lb); since the selection of the transient operating point needs to be performed on the exhaust gas flow contour line that is approximately straight, the green curves (exhaust gas flow contour lines) are approximately straight, for example, 3 dotted lines from top left to bottom right indicate 3 target exhaust gas flow contour lines, that is, 3 exhaust gas flow contour lines that are approximately straight, respectively, 100 grams per second (g/s) target exhaust gas flow contour line (corresponding to 6W airspeed), 200g/s target exhaust gas flow contour line (corresponding to 8W airspeed), and 300g/s target exhaust gas flow contour line (corresponding to 10W airspeed).
In the process of approximating the exhaust gas flow contour line to a straight line by the electronic device, a flow deviation may occur, and the maximum flow deviation is empirically controlled to ±15g/s.
For example, with reference to fig. 2, for each target exhaust flow contour, the electronic device determines a plurality of intersections of the target exhaust flow contour with a plurality of inlet temperature contours, that is, selects a plurality of inlet temperature points from low (175 ℃) to high (450 ℃) from the target exhaust flow contour, and determines the selected plurality of inlet temperature points as a plurality of transient operating points. Then, the electronic device selects a preset number of target transient operating points from the plurality of transient operating points, and controls the engine to slowly run according to the preset number of target transient operating points.
For example, for a preset number of target transient operating points on any target exhaust gas flow contour line, in a process of controlling the engine to slowly run according to the preset number of target transient operating points, taking a target transient operating point corresponding to a lowest inlet temperature (such as 175 ℃) in the preset number of target transient operating points as a starting point and taking a target transient operating point corresponding to a highest inlet temperature (such as 450 ℃) in the preset number of target transient operating points as an ending point. The electronic equipment controls the engine to start running from a starting point, and after the engine is stabilized for a preset period of time (such as 2 minutes), the engine is controlled to slowly run from low to high according to the inlet temperature until the engine runs to an end point, at the moment, fuel injection is stopped, the engine slowly returns to a medium-rotating-speed low-torque working point, the post-treatment carrier is cooled, and the cooling time is required to meet a preset time threshold value so as to ensure that the DOC inlet temperature is lower than 175 ℃. If the cooling is insufficient (i.e., the DOC inlet temperature is greater than 175 ℃), the electronics can control the engine back to idle to allow further cooling of the aftertreatment carrier.
Then, taking the target transient operating point corresponding to the lowest inlet temperature (such as 175 ℃) in the preset number of target transient operating points of the next target exhaust gas flow contour line as a starting point, the process of controlling the engine to slowly run according to the preset number of target transient operating points by the electronic equipment is the same as the process, and details are not repeated here.
Optionally, the preset time threshold may be set before the electronic device leaves the factory, or may be user-defined, which is not specifically limited herein.
Optionally, the control engine is slowly operated according to a plurality of target transient operating points, that is, the DOC inlet temperature is controlled to slowly climb from low (e.g. 175 ℃) to high (e.g. 450 ℃), and the electronic device can control the DOC inlet temperature to slowly climb by increasing the torque of the engine and/or reducing the rotational speed of the engine.
It should be noted that, during the process of increasing the torque of the engine and decreasing the rotational speed of the engine, the rate of increase of the torque and the rate of decrease of the rotational speed may be different to ensure that the flow rate of the exhaust gas is fixed.
In some embodiments, determining, by the electronic device, a thermal efficiency for each of a plurality of target transient operating points may include: and the electronic equipment determines the thermal efficiency corresponding to each of the target transient operating points according to the fuel injection quantity and the exhaust gas flow corresponding to the DOC.
The fuel injection quantity refers to the post-engine fuel injection quantity, namely the fuel injection quantity of the DOC inlet.
In the process of determining the thermal efficiency, the electronic equipment determines the fuel injection quantity of the DOC inlet, namely the fuel injection quantity, and then determines the thermal efficiency corresponding to each of a plurality of target transient operating points according to the fuel injection quantity and the exhaust gas flow.
In some embodiments, the determining, by the electronic device, the thermal efficiency corresponding to each of the plurality of target transient operating points according to the fuel injection amount and the exhaust gas flow corresponding to the DOC may include: the electronic equipment determines the oil injection quantity according to the predicted concentration and the exhaust gas flow corresponding to the hydrocarbon at the DOC inlet; the following operations are performed for each target transient operating point: the electronic equipment determines the thermal efficiency corresponding to the target transient operating point according to the fuel injection quantity, the exhaust gas flow and the inlet temperature corresponding to the target transient operating point.
Optionally, the predicted concentration (i.e., the expected HC injection amount) corresponding to the hydrocarbon at the DOC inlet may be within a preset concentration range, which may be set before the electronic device is shipped, or may be user-defined, and is generally set according to an empirical value, for example, the preset concentration range is set to [3000ppm,4000ppm ], and this preset concentration range may implement transient light-off in the DOC. Wherein, the unit ppm represents the concentration in parts per million.
For example, the predicted concentration of hydrocarbon HC at the DOC inlet may be expressed as:
Wherein the predicted concentration of hydrocarbon is within [3000ppm,4000ppm ]; m dose represents the fuel injection quantity, and the unit is g/s; m ex denotes the exhaust gas flow in g/s, m ex＝mair+mfuel, mair denotes the mass air flow, and m fuel denotes the mass fuel flow; MWex denotes the molar mass of the exhaust gas in grams per mole (g/mol), MW ex＝28.9g/mol;MWhc denotes the molar mass of the hydrocarbon, MW hc =13.8 g/mol.
Since the predicted concentration is known, the DOC inlet can be back calculated by using the above formula (1), i.e. the fuel injection amount m dose:
In the process of determining the thermal efficiency, the electronic device may determine the injection amount m dose according to the predicted concentration hydro carbon corresponding to the hydrocarbon at the DOC inlet and the exhaust gas flow amount m ex by using the above formula (2); then, the following operations are performed for each target transient operating point: the electronic equipment can determine the thermal efficiency corresponding to the target transient operating point according to the fuel injection quantity m dose, the exhaust gas flow quantity m ex and the inlet temperature corresponding to the target transient operating point.
In some embodiments, the determining, by the electronic device, the thermal efficiency corresponding to the target transient operating point according to the fuel injection amount, the exhaust gas flow, and the inlet temperature corresponding to the target transient operating point may include: the electronic equipment determines a first thermal coefficient according to the inlet temperature; determining a second thermal coefficient according to the outlet temperature of the DOC; the electronic equipment determines the thermal efficiency corresponding to the target transient operating point according to the fuel injection quantity, the exhaust gas flow, the inlet temperature, the outlet temperature, the first thermal coefficient, the second thermal coefficient and the low heat value of the fuel.
Wherein, the inlet temperature can be represented by T in; the outlet temperature (DOC outlet temperature) is the above-mentioned T5 temperature, and may be represented by T out.
The first thermal coefficient refers to the exhaust gas thermal coefficient at the temperature of T in at the DOC inlet.
The second thermal coefficient refers to the thermal coefficient of the exhaust gas at the temperature of T out at the outlet of the DOC.
Illustratively, the electronic device determines a first thermal coefficient according to T in, which may be expressed as: c p,ex,in＝0.98353+0.00021743×Tin; the electronic device determines a second thermal coefficient based on T out, which may be expressed as: c p,ex,out＝0.98353+0.00021743×Tout.
For example, the thermal efficiency corresponding to the target transient operating point may be expressed as:
wherein LHV represents the low heating value of fuel in kilojoules per kilogram (KJ/kg), lhv= 43200KJ/kg.
The following operations are performed for each target transient operating point: the electronic device determines a first thermal coefficient C p,ex,in according to the inlet temperature T in and a second thermal coefficient C p,ex,out according to the outlet temperature T out; then, the electronic device may determine the Thermal efficiency thermal_off corresponding to the target transient operating point according to the fuel injection amount m dose, the exhaust gas flow amount m ex, the inlet temperature T in, the outlet temperature T out, the first Thermal coefficient C p,ex,in, the second Thermal coefficient C p,ex,out, and the fuel low heating value LHV by using the above formula (3).
Exemplary, as shown in FIG. 3, is a schematic representation of the light-off curve at a certain airspeed provided by the present invention. In the graph, the abscissa is DOC inlet temperature T in in degrees Celsius; the ordinate is Thermal efficiency, eff, in units of; the inlet temperature corresponding to 50% of the thermal efficiency (i.e., the target thermal efficiency) on the light-off curve is the light-off temperature of the DOC at the airspeed.
In some embodiments, after determining the injection amount, the method may further include: the electronic equipment obtains a first measured concentration corresponding to the hydrocarbon at the outlet of the DOC, which is acquired by the sampling instrument; the electronic equipment determines a second measured concentration corresponding to the hydrocarbon at the DOC inlet according to the fuel injection quantity and the exhaust gas flow; the electronic device determines conversion efficiency corresponding to the hydrocarbon according to the first measured concentration and the second measured concentration.
Wherein the first measured concentration of hydrocarbon at the DOC outlet may be expressed as hydrocabon out.
For example, a second measured concentration of hydrocarbon at the DOC inlet may be expressed as:
Wherein m dose is the fuel injection amount determined according to the above formula (2); m ex represents the exhaust gas flow rate; MW fuel represents the fuel molar mass, MW fuel =13.8 g/mol; MWex denotes the molar mass of the exhaust gas, MW ex =28.9 g/mol.
For example, the conversion efficiency for a hydrocarbon can be expressed as:
After determining the fuel injection amount, the electronic device may first obtain a first actually measured concentration hydrolbon out corresponding to the hydrocarbon at the DOC outlet collected by the sampling instrument, and then determine a second actually measured concentration hydrolbon in according to the fuel injection amount m dose and the exhaust gas flow m ex by using the above formula (4); then, the electronic device may determine the conversion efficiency hydroarbor Conv corresponding to the hydrocarbon according to the first measured concentration hydroarbor out and the second measured concentration hydroarbor in using the above formula (5).
In the embodiment of the invention, a plurality of airspeeds and a plurality of inlet temperatures corresponding to a catalytic oxidizer DOC are obtained; the following operations are performed for each airspeed: determining transient operating points corresponding to a plurality of inlet temperatures respectively at airspeed; in the process of controlling the engine to run according to the target transient operating points, determining the thermal efficiency corresponding to each target transient operating point, determining the inlet temperature corresponding to the target thermal efficiency in all the thermal efficiencies as the ignition temperature of the DOC under the airspeed, and the target transient operating points belong to the transient operating points. According to the method, based on different DOC inlet temperatures at airspeed, a plurality of target transient operating points are determined, the thermal efficiencies corresponding to the target transient operating points are further determined, the target thermal efficiency is determined from all the thermal efficiencies, the DOC inlet temperature corresponding to the target thermal efficiency is determined to be the ignition temperature of the DOC at airspeed, the ignition temperature is accurate, the ignition capability of the DOC can be effectively represented, and the accurate assessment of the ignition capability of the DOC is facilitated.
The ignition temperature determining apparatus of the catalytic oxidizer provided by the invention is described below, and the ignition temperature determining apparatus of the catalytic oxidizer described below and the ignition temperature determining method of the catalytic oxidizer described above can be referred to correspondingly with each other.
As shown in fig. 4, which is a schematic structural diagram of the device for determining the light-off temperature of the catalytic oxidizer according to the present invention, the device may include:
An acquisition module 401, configured to acquire a plurality of airspeeds and a plurality of inlet temperatures corresponding to the catalytic oxidizer DOC;
A processing module 402, configured to perform the following operations for each airspeed: determining transient operating points corresponding to the inlet temperatures respectively at the airspeed; in the process of controlling the engine to run according to a plurality of target transient operating points, determining the thermal efficiency corresponding to each of the target transient operating points, and determining the inlet temperature corresponding to the target thermal efficiency in all the thermal efficiencies as the ignition temperature of the DOC at the airspeed, wherein the target transient operating points belong to the transient operating points.
Optionally, the plurality of airspeeds are within a preset airspeed range; the plurality of inlet temperatures are within a preset temperature range and are ordered from low to high.
Optionally, the processing module 402 is specifically configured to determine the thermal efficiencies corresponding to the target transient operating points according to the fuel injection amounts and the exhaust gas flows corresponding to the DOC.
Optionally, the processing module 402 is specifically configured to determine a plurality of airspeed contours corresponding to the DOC according to the plurality of airspeeds and a universal characteristic diagram of the engine; determining a plurality of inlet temperature contour lines corresponding to the DOC according to the inlet temperatures and the universal characteristic curve graph; for each airspeed contour, determining a plurality of intersections of the airspeed contour and the plurality of inlet temperature contours as the plurality of transient operating points.
Optionally, the processing module 402 is specifically configured to determine the fuel injection amount according to a predicted concentration of hydrocarbons at the DOC inlet and the exhaust gas flow; the following operations are performed for each target transient operating point: and determining the thermal efficiency corresponding to the target transient operating point according to the fuel injection quantity, the exhaust gas flow and the inlet temperature corresponding to the target transient operating point.
Optionally, the processing module 402 is specifically configured to determine a first thermal coefficient according to the inlet temperature; and determining a second thermal coefficient based on the outlet temperature of the DOC; and determining the thermal efficiency corresponding to the target transient operating point according to the fuel injection quantity, the exhaust gas flow, the inlet temperature, the outlet temperature, the first thermal coefficient, the second thermal coefficient and the low heat value of the fuel.
Optionally, the processing module 402 is further configured to obtain a first measured concentration corresponding to the hydrocarbon at the outlet of the DOC, where the first measured concentration is collected by the sampling instrument; determining a second measured concentration corresponding to the hydrocarbon at the DOC inlet according to the fuel injection quantity and the exhaust gas flow; and determining the conversion efficiency corresponding to the hydrocarbon according to the first measured concentration and the second measured concentration.
As shown in fig. 5, a schematic structural diagram of an electronic device provided by the present invention may include: processor 510, communication interface (Communications Interface) 520, memory 530, and communication bus 540, wherein processor 510, communication interface 520, memory 530 complete communication with each other through communication bus 540. Processor 510 may invoke logic instructions in memory 530 to perform a method of determining a light-off temperature of a catalytic oxidizer, the method comprising: acquiring a plurality of airspeeds and a plurality of inlet temperatures corresponding to a catalytic oxidizer DOC; the following operations are performed for each airspeed: determining transient operating points corresponding to the inlet temperatures respectively at the airspeed; in the process of controlling the engine to run according to a plurality of target transient operating points, determining the thermal efficiency corresponding to each of the target transient operating points, and determining the inlet temperature corresponding to the target thermal efficiency in all the thermal efficiencies as the ignition temperature of the DOC at the airspeed, wherein the target transient operating points belong to the transient operating points.
Further, the logic instructions in the memory 530 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, the computer program product comprising a computer program, the computer program being storable on a non-transitory computer readable storage medium, the computer program, when executed by a processor, being capable of executing the method for determining the light-off temperature of a catalytic oxidizer provided by the methods described above, the method comprising: acquiring a plurality of airspeeds and a plurality of inlet temperatures corresponding to a catalytic oxidizer DOC; the following operations are performed for each airspeed: determining transient operating points corresponding to the inlet temperatures respectively at the airspeed; in the process of controlling the engine to run according to a plurality of target transient operating points, determining the thermal efficiency corresponding to each of the target transient operating points, and determining the inlet temperature corresponding to the target thermal efficiency in all the thermal efficiencies as the ignition temperature of the DOC at the airspeed, wherein the target transient operating points belong to the transient operating points.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform the method for determining the light-off temperature of a catalytic oxidizer provided by the methods described above, the method comprising: acquiring a plurality of airspeeds and a plurality of inlet temperatures corresponding to a catalytic oxidizer DOC; the following operations are performed for each airspeed: determining transient operating points corresponding to the inlet temperatures respectively at the airspeed; in the process of controlling the engine to run according to a plurality of target transient operating points, determining the thermal efficiency corresponding to each of the target transient operating points, and determining the inlet temperature corresponding to the target thermal efficiency in all the thermal efficiencies as the ignition temperature of the DOC at the airspeed, wherein the target transient operating points belong to the transient operating points.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for determining the light-off temperature of a catalytic oxidizer, comprising:
Acquiring a plurality of airspeeds and a plurality of inlet temperatures corresponding to a catalytic oxidizer DOC;
The following operations are performed for each airspeed: determining transient operating points corresponding to the inlet temperatures respectively at the airspeed; in the process of controlling the engine to run according to a plurality of target transient operating points, determining the thermal efficiency corresponding to each of the target transient operating points, and determining the inlet temperature corresponding to the target thermal efficiency in all the thermal efficiencies as the light-off temperature of the DOC under the airspeed, wherein the target transient operating points belong to the transient operating points.
2. The method of claim 1, wherein the plurality of airspeeds are within a preset airspeed range; the plurality of inlet temperatures are within a preset temperature range and are ordered from low to high.
3. The method of claim 1 or 2, wherein the determining the respective thermal efficiencies of the plurality of target transient operating points comprises:
And determining the thermal efficiency corresponding to each of the target transient operating points according to the fuel injection quantity and the exhaust gas flow corresponding to the DOC.
4. The method of claim 1 or 2, wherein said determining transient operating points for each of said plurality of inlet temperatures at said airspeed comprises:
Determining a plurality of airspeed contours corresponding to the DOC according to the plurality of airspeeds and a universal characteristic diagram of the engine; determining a plurality of inlet temperature contour lines corresponding to the DOC according to the inlet temperatures and the universal characteristic curve graph;
for each airspeed contour, determining a plurality of intersections of the airspeed contour and the plurality of inlet temperature contours as the plurality of transient operating points.
5. The method of claim 3, wherein determining the thermal efficiency for each of the plurality of target transient operating points based on the amount of fuel injected and the flow of exhaust gas for the DOC comprises:
determining the fuel injection quantity according to the predicted concentration corresponding to the hydrocarbon at the DOC inlet and the exhaust gas flow;
The following operations are performed for each target transient operating point: and determining the thermal efficiency corresponding to the target transient operating point according to the fuel injection quantity, the exhaust gas flow and the inlet temperature corresponding to the target transient operating point.
6. The method of claim 5, wherein the determining the thermal efficiency corresponding to the target transient operating point based on the fuel injection amount, the exhaust gas flow rate, and the inlet temperature corresponding to the target transient operating point comprises:
Determining a first thermal coefficient based on the inlet temperature; determining a second thermal coefficient according to the outlet temperature of the DOC;
and determining the thermal efficiency corresponding to the target transient operating point according to the fuel injection quantity, the exhaust gas flow, the inlet temperature, the outlet temperature, the first thermal coefficient, the second thermal coefficient and the low heat value of the fuel.
7. The method of claim 5, wherein after said determining said amount of fuel injection, said method further comprises:
Acquiring a first measured concentration corresponding to the hydrocarbon at the outlet of the DOC acquired by the sampling instrument;
determining a second measured concentration corresponding to the hydrocarbon at the DOC inlet according to the fuel injection quantity and the exhaust gas flow;
And determining the conversion efficiency corresponding to the hydrocarbon according to the first measured concentration and the second measured concentration.
8. A light-off temperature determining device of a catalytic oxidizer, comprising:
The acquisition module is used for acquiring a plurality of airspeeds and a plurality of inlet temperatures corresponding to the catalytic oxidizer DOC;
The processing module is used for executing the following operations for each airspeed: determining transient operating points corresponding to the inlet temperatures respectively at the airspeed; in the process of controlling the engine to run according to a plurality of target transient operating points, determining the thermal efficiency corresponding to each of the target transient operating points, and determining the inlet temperature corresponding to the target thermal efficiency in all the thermal efficiencies as the light-off temperature of the DOC under the airspeed, wherein the target transient operating points belong to the transient operating points.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of determining the light-off temperature of a catalytic oxidizer as claimed in any one of claims 1 to 7 when executing the program.
10. A non-transitory computer readable storage medium having stored thereon a computer program, characterized in that the computer program, when executed by a processor, implements the light-off temperature determination method of the catalytic oxidizer according to any one of claims 1 to 7.
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