CN112610316B - Temperature detection device and method - Google Patents
Temperature detection device and method Download PDFInfo
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- CN112610316B CN112610316B CN202011465032.0A CN202011465032A CN112610316B CN 112610316 B CN112610316 B CN 112610316B CN 202011465032 A CN202011465032 A CN 202011465032A CN 112610316 B CN112610316 B CN 112610316B
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0842—Nitrogen oxides
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
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- 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
Abstract
The invention discloses a temperature detection device, which is used for a tail gas exhaust system with a nitrogen oxide adsorption device; the temperature detection device includes: a first detector and a controller; wherein the first detector is configured to detect an intake air temperature of the exhaust gas entering the nitrogen oxide adsorption device, wherein the nitrogen oxide adsorption device is in a reduction regeneration mode; the controller is used for obtaining result predicted temperature based on preset temperature rising time, temperature rising slope and the air inlet temperature, and controlling the nitrogen oxide adsorption device to exit the reduction regeneration mode when the result predicted temperature exceeds a preset temperature threshold. The invention also discloses a temperature detection method. Utilize the temperature-detecting device of this application, the tail gas pollutant content after nitrogen oxide adsorption equipment handles is lower, can not exceed standard.
Description
Technical Field
The invention relates to the technical field of vehicle detection, in particular to a temperature detection device and method.
Background
At present, in order to meet the requirements of the emission regulations of light diesel engine state 6b, the tail gas generated by the light diesel engine needs to be filtered and then discharged. An exhaust gas treatment system was obtained by combining NSC (nitrogen oxide adsorption device), DPF (diesel particulate filter), and SCR (selective catalytic reduction device).
Generally, when a nitrogen oxide adsorption device is used for treating exhaust gas generated by a light diesel engine, the exhaust gas is divided into two stages, wherein the first stage is an exhaust gas pollutant (nitrogen oxide and sulfur oxide) storage stage, and the second stage is an exhaust gas pollutant regeneration and reduction stage. When the nitrogen oxide adsorption apparatus performs the second stage of exhaust gas treatment, a higher temperature is required inside the nitrogen oxide adsorption apparatus.
However, when the nitrogen oxide adsorption device treats the received tail gas, the content of the tail gas pollutants treated by the nitrogen oxide adsorption device exceeds the standard.
Disclosure of Invention
The invention mainly aims to provide a temperature detection device and a temperature detection method, and aims to solve the technical problem that the content of pollutants in the tail gas treated by a nitrogen oxide adsorption device exceeds the standard when the nitrogen oxide adsorption device treats the received tail gas in the prior art.
In order to achieve the above object, the present invention provides a temperature detection device for an exhaust gas system having a nitrogen oxide adsorption device; the temperature detection device includes: a first detector and a controller; wherein the content of the first and second substances,
the first detector is used for detecting the inlet air temperature of the exhaust gas entering the nitrogen oxide adsorption device, wherein the nitrogen oxide adsorption device is in a reduction regeneration mode;
the controller is used for obtaining result predicted temperature based on preset temperature rising time, temperature rising slope and the air inlet temperature, and controlling the nitrogen oxide adsorption device to exit the reduction regeneration mode when the result predicted temperature exceeds a preset temperature threshold.
Alternatively to this, the first and second parts may,
the controller is further configured to obtain the result predicted temperature based on the preset temperature rise time, the temperature rise slope, the intake air temperature, and the temperature rise deviation.
Alternatively to this, the first and second parts may,
the controller is further configured to obtain the result predicted temperature based on the preset temperature rise time, the temperature rise slope, the intake air temperature, the temperature rise deviation, and the temperature change value.
Optionally, the temperature detecting device further includes: a second detector and a third detector;
the second detector is used for detecting the rotating speed of the engine;
the third detector is used for detecting the fuel injection quantity of the engine;
the controller is further configured to obtain the temperature rise deviation, the preset temperature rise time, the intake air temperature, the temperature rise deviation and the temperature change value in a pre-stored calibration parameter set based on the intake air temperature, the rotation speed and the fuel injection amount before obtaining the result predicted temperature based on the temperature rise deviation, the preset temperature rise time, the intake air temperature, the temperature rise deviation and the temperature change value.
Optionally, the nitrogen oxide adsorption device has a plurality of reaction zones;
the controller is further configured to obtain a plurality of temperature change values, a plurality of initial temperatures, the temperature rise deviation, the preset temperature rise time, and the temperature rise deviation of the plurality of reaction zones in the calibration parameter set based on the intake air temperature, the rotation speed, and the fuel injection amount, obtain a plurality of initial predicted temperatures corresponding to the plurality of reaction zones based on the plurality of temperature change values, the plurality of initial temperatures, the temperature rise deviation, the preset temperature rise time, and the temperature rise deviation, and determine the resulting predicted temperature having the largest temperature value among the plurality of initial predicted temperatures.
Alternatively to this, the first and second parts may,
the controller is further configured to obtain the plurality of initial predicted temperatures by using a formula one based on the plurality of temperature change values, the plurality of initial temperatures, the temperature rise deviation, the preset temperature rise time, and the temperature rise deviation;
the first formula is as follows:
Tp,j＝Trs,j+Tcvn,j+dt×t+Tosc
wherein, Tp,jAn initial predicted temperature, T, for a jth reaction zone of the plurality of reaction zonesrs,jAn initial temperature, T, corresponding to a jth reaction zone of the plurality of reaction zonescvn,jA temperature change value corresponding to a jth reaction region among the plurality of reaction regions, dt being the temperature riseSlope, ToscAnd t is the preset temperature rise time for the temperature rise deviation.
Alternatively to this, the first and second parts may,
the controller is further configured to receive the calibration parameter set sent by a sending end before acquiring, in the calibration parameter set, a plurality of temperature change values, a plurality of initial temperatures, the temperature rise deviation, the preset temperature rise time, and the temperature rise deviation of the plurality of reaction regions based on the intake air temperature, the rotation speed, and the fuel injection amount, and store the calibration parameter set, where the calibration parameter set is obtained by performing parameter calibration on the nitrogen oxide adsorption device with a calibration tool based on a preset intake air temperature, a preset rotation speed, a preset fuel injection amount of the engine, and a detected temperature of the nitrogen oxide adsorption device with the plurality of reaction regions.
Optionally, the first detector is a temperature sensor.
Optionally, the controller is an ECU.
In addition, the invention also provides a temperature detection method for the temperature detection device, wherein the temperature detection device is used for an exhaust system with a nitrogen oxide adsorption device; the temperature detection device includes: a first detector and a controller; the temperature detection method comprises the following steps:
detecting, with the first detector, an intake air temperature of exhaust gas entering the nitrogen oxide adsorption device, wherein the nitrogen oxide adsorption device is in a reduction regeneration mode;
and obtaining a result predicted temperature by using the controller based on a preset temperature rise time, a temperature rise slope and the air inlet temperature, and controlling the nitrogen oxide adsorption device to exit the reduction regeneration mode when the result predicted temperature exceeds a preset temperature threshold.
The technical scheme of the invention provides a temperature detection device which is used for a tail gas exhaust system with a nitrogen oxide adsorption device; the temperature detection device includes: a first detector and a controller; wherein the first detector is configured to detect an intake air temperature of the exhaust gas entering the nitrogen oxide adsorption device, wherein the nitrogen oxide adsorption device is in a reduction regeneration mode; the controller is used for obtaining result predicted temperature based on preset temperature rising time, temperature rising slope and the air inlet temperature, and controlling the nitrogen oxide adsorption device to exit the reduction regeneration mode when the result predicted temperature exceeds a preset temperature threshold. Because, nitrogen oxide adsorption equipment carries out the regeneration reduction of tail gas to the tail gas received when handling, nitrogen oxide adsorption equipment needs higher temperature, lead to nitrogen oxide adsorption equipment to begin to age, make the tail gas pollutant content after nitrogen oxide adsorption equipment handles exceed standard, and utilize the temperature-detecting device of this application, nitrogen oxide adsorption equipment is when the prediction temperature exceedes predetermined temperature threshold, temperature-detecting device control nitrogen oxide adsorption equipment withdraws from regeneration reduction mode, make nitrogen oxide adsorption equipment's actual temperature reduce, nitrogen oxide adsorption equipment can not age, and then make the tail gas pollutant content after nitrogen oxide adsorption equipment handles lower, so, utilize the temperature-detecting device of this application, the tail gas pollutant content after nitrogen oxide adsorption equipment handles is lower, can not exceed standard.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a block diagram of a temperature detecting device according to a first embodiment of the present invention;
FIG. 2 is a block diagram of a temperature detecting device according to a second embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an oxide adsorption device according to the present invention;
FIG. 4 is a flowchart illustrating a temperature detecting method according to a first embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a block diagram of a temperature detecting device according to a first embodiment of the present invention; the device is used for an exhaust gas system with a nitrogen oxide adsorption device; the temperature detection device includes: a first detector 10 and a controller 20; wherein the content of the first and second substances,
the first detector 10 for detecting an intake air temperature of the exhaust gas entering the nitrogen oxide adsorption apparatus, wherein the nitrogen oxide adsorption apparatus is in a reduction regeneration mode;
the controller 20 is configured to obtain a result predicted temperature based on a preset temperature rise time, a temperature rise slope, and the intake air temperature, and control the nitrogen oxide adsorption apparatus to exit the reduction regeneration mode when the result predicted temperature exceeds a preset temperature threshold.
The nitrogen oxide adsorption device is configured to receive the exhaust gas generated by the engine (hereinafter, the first exhaust gas is referred to as the exhaust gas), and filter the first exhaust gas to obtain a second exhaust gas, where the first exhaust gas is divided into a first exhaust gas in a first stage and a first exhaust gas in a second stage, and the first exhaust gas and the second exhaust gas are mutually exclusive; the engine is in different working modes, and the obtained first tail gas is different. In the stage of the engine lean combustion mode (the oxygen content in the engine is higher), first-stage first tail gas is obtained, and the first-stage first tail gas mainly comprises: NO, SO2And O2Etc.; in the stage of engine rich combustion mode (the oxygen content in the engine is low), the first tail gas of the second stage is obtained, and the second stage is used forThe first tail gas mainly comprises: CO, H2And SO2And the like.
When the engine is in a lean combustion mode, the nitrogen oxide adsorption device is in a storage mode corresponding to the storage stage, and when the engine is in a rich combustion mode, the nitrogen oxide adsorption device is in a regeneration reduction mode corresponding to the regeneration reduction stage. When the engine is in a rich combustion mode, the nitrogen oxide adsorption device is in a regeneration reduction mode corresponding to a regeneration reduction stage, and the tail gas is required to be subjected to desulfurization treatment; when the nitrogen oxide adsorption apparatus is subjected to desulfurization treatment, the temperature of the nitrogen oxide adsorption apparatus becomes relatively high (exceeding 630 ℃), which easily causes the nitrogen oxide adsorption apparatus to age, and particularly, when the temperature of the nitrogen oxide adsorption apparatus exceeds 720 ℃, the nitrogen oxide adsorption apparatus starts to age.
In addition, when the temperature of the nitrogen oxide adsorption device reaches the preset temperature threshold, the nitrogen oxide adsorption device exits the regeneration and reduction mode, and the temperature of the nitrogen oxide adsorption device continues to rise within a certain time, so that the temperature of the nitrogen oxide adsorption device exceeds the preset temperature threshold (the preset temperature threshold in the present application is slightly lower than 720 ℃, for example, 700 ℃, the present invention is not limited). Therefore, even if the nitrogen oxide adsorption device is controlled to exit the regeneration and reduction mode when the result predicted temperature of the nitrogen oxide adsorption device reaches the preset temperature threshold value, the actual temperature of the nitrogen oxide adsorption device can exceed the preset temperature threshold value, so that the temperature of the nitrogen oxide adsorption device needs to be predicted to obtain the result predicted temperature. And the time for the continuous temperature rise of the nitrogen oxide adsorption device is the preset temperature rise time.
The result prediction temperature obtained by the method is a prediction temperature, the actual temperature of the nitrogen oxide adsorption device does not reach the result prediction temperature, when the result prediction temperature value of the oxide adsorption device exceeds a preset temperature threshold value, after the oxide adsorption device exits a regeneration reduction mode, and the actual temperature of the oxide adsorption device continuously rises, the reached limit temperature value does not exceed the result prediction temperature value, so that the oxide adsorption device is not aged, and the oxide adsorption device is well protected.
When the nitrogen oxide adsorption device works (first tail gas is filtered to obtain second tail gas), the nitrogen oxide adsorption device is divided into an oxidation storage stage (corresponding to a storage mode) and a regeneration reduction stage (corresponding to a regeneration reduction mode), wherein the oxidation storage stage is used for storing the first tail gas in the first stage when the first tail gas in the first stage is received to obtain a storage compound and carbon dioxide (the carbon dioxide is the second tail gas in the first stage of the second tail gas), the regeneration reduction stage is entered when the first tail gas in the first stage is received to be ended, and the first tail gas in the second stage is received to be started, the second tail gas is obtained based on the storage compound and the first tail gas in the second stage, and the second tail gas (the second tail gas in the second stage of the second tail gas) mainly comprises the carbon dioxide and the nitrogen.
Before the first exhaust gas (the first exhaust gas in the first stage and the first exhaust gas in the second stage are required to be detected in oxygen content) is transmitted to the nitrogen oxide adsorption device from the engine, a first detector is required to detect the first oxygen content.
Oxidation storage stage, first stage Nitrogen Oxides (NO) in first exhaust gasx) The reaction process of (A) is as follows:
and (3) oxidation: 2NO + O2→2NO2
And (3) storing: 4NO2+2BaCO3+O2→2Ba(NO3)2+2CO2
In addition, the first tail gas of the first stage also comprises less Sulfur Oxides (SO)x) Sulfur Oxides (SO) in first stage first tail gasx) The reaction process of (A) is as follows:
and (3) oxidation: 2SO2+O2→2SO3
And (3) storing: SO (SO)3+BaCO3→BaSO4+CO2
The exhaust volume of the first exhaust gas in the first stage is limited, and when the exhaust volume reaches a preset threshold value, the engine is switched to a mode (the lean burn mode enters the rich burn mode); in the first stage, the displacement of the first tail gas does not reach a preset threshold value, the engine is in a lean burn mode, and the engine generates a first exhaust gasThe method comprises the following steps that first-stage first tail gas is generated, and when the exhaust volume of the first-stage first tail gas reaches a preset threshold value, an engine enters a rich combustion mode to generate second-stage first tail gas; the preset threshold value can be a value within the range of 1-2g, and a user can measure NO of the engine under various working conditions by utilizing universal characteristics according to requirementsxThe emission model is used, and NO under different working conditions is calculated by using the controller according to the emission modelxAn amount of storage; it is understood that the preset thresholds for different conditions are different, for example, the storage amounts for vehicle speed 40-100km/h, fuel injection amount 15-60 mg/cycle (mg/hub) and exhaust temperature 200-.
Then, after the first stage first exhaust gas is stored in the nitrogen oxide adsorption device as described above, when the second stage first exhaust gas is received, the regeneration and reduction stage is started, which lasts for about 10 seconds, and based on the stored compounds after oxidation and the second stage first exhaust gas, the following reactions of nitrides proceed:
regeneration: ba (NO)3)2+CO→BaCO3+2NO+O2
Reduction: 2NO +2CO → N2+2CO2 O2+2CO→2CO2
In addition, the storage compound also comprises sulfide, the first tail gas of the second stage also comprises sulfur oxide, and the following reactions are carried out:
regeneration: BaSO4+CO→BaCO3+SO2
Reduction: SO (SO)2+CO→COS+O2 4SO2+2CO→2CS2+5O2
SO2+H2→H2S+O2 2H2S+O2→2H2O+2S
And (3) transmitting the second tail gas generated after the regeneration reduction stage to other devices or discharging the second tail gas, and in addition, discharging the second tail gas from an outlet of the nitrogen oxide adsorption device, wherein a second detector is required to detect the second oxygen content before the second tail gas is transmitted to other devices or discharged. It will be appreciated that the second off-gas is also divided into two stages, the first stage comprising mainly carbon dioxide and the second stage comprising carbon dioxide and nitrogen, the two stages of the second off-gas corresponding to the two stages of the first off-gas.
Further, the controller 20 is further configured to obtain the result predicted temperature based on the preset temperature rise time, the temperature rise slope, the intake air temperature, and the temperature rise deviation.
Further, the controller 20 is further configured to obtain the result predicted temperature based on the preset temperature rise time, the temperature rise slope, the intake air temperature, the temperature rise deviation, and the temperature change value.
Referring to fig. 2, fig. 2 is a block diagram of a temperature detecting device according to a second embodiment of the present invention; wherein, the temperature detection device further comprises: a second detector 30 and a third detector 40;
the second detector 30 is used for detecting the rotating speed of the engine;
the third detector 40 is configured to detect an oil injection amount of the engine;
the controller 20 is further configured to obtain the temperature rise deviation, the preset temperature rise time, the intake air temperature, the temperature rise deviation, and the temperature change value in a preset calibration parameter set based on the intake air temperature, the rotation speed, and the fuel injection amount before obtaining the result predicted temperature based on the temperature rise deviation, the preset temperature rise time, the intake air temperature, the temperature rise deviation, and the temperature change value.
It is understood that the preset temperature rise time, the temperature rise slope, the temperature rise deviation and the temperature change value are obtained in a pre-stored calibration parameter set. Generally, under the same working condition (the same rotating speed and the same fuel injection quantity), the corresponding temperature rise deviation, the preset temperature rise time and the temperature rise slope are fixed values, the corresponding temperature change value is a variable value, and the temperature change value changes along with the operation time of the reduction regeneration mode, namely, the stored calibration parameter set is a temperature value which changes along with time under the same working condition.
Further, the controller 20 is further configured to receive the calibration parameter set sent by a sending end before acquiring, in the calibration parameter set, a plurality of temperature change values, a plurality of initial temperatures, the temperature rise deviation, the preset temperature rise time, and the temperature rise deviation of the plurality of reaction regions based on the intake air temperature, the rotation speed, and the fuel injection amount, and store the calibration parameter set, where the calibration parameter set is obtained by performing parameter calibration on the nitrogen oxide adsorption apparatus with a calibration tool based on a preset intake air temperature, a preset rotation speed, a preset fuel injection amount, and a detected temperature of the nitrogen oxide adsorption apparatus with a plurality of reaction regions of the engine.
It should be noted that the calibration tool may be various types of engine calibration tools, and the application is not limited thereto.
The sender may be any form of computer. The method comprises the steps that a preset air inlet temperature, a preset rotating speed and a preset oil injection quantity are respectively corresponding air inlet temperature, rotating speed and oil injection quantity of an engine under different working conditions, detected temperature is an actual temperature value detected by a first detector in each of a plurality of reaction areas of a nitrogen oxide adsorption device when the nitrogen oxide adsorption device operates under different working conditions, and a sending end carries out parameter calibration on the nitrogen oxide adsorption device by using an engine calibration tool to obtain a calibration parameter set based on the preset air inlet temperature, the preset rotating speed, the preset oil injection quantity and the detected temperature of the nitrogen oxide adsorption device with the plurality of reaction areas.
It can be understood that, when the parameter calibration is performed, temperature sensors are required to be arranged in a plurality of reaction areas for detecting the actual temperature values of the reaction areas.
Wherein the intake air temperature is constantly changed with the time that the oxide adsorbing device is in the regeneration reduction mode. And obtaining the result prediction temperature at different moments by using the temperature rise deviation, the preset temperature rise time, the air inlet temperature, the temperature rise deviation and the temperature change value, wherein the result prediction temperature is changed in real time, and when the result prediction temperature exceeds a preset temperature threshold at a certain moment, the oxide adsorption device is controlled to exit the reduction regeneration mode. In other words, the temperature detection device of the present application is intended to start uninterrupted operation (detecting the intake air temperature in real time to obtain the result prediction temperature in real time) when the nitrogen oxide adsorption device enters the reduction regeneration mode until the nitrogen oxide adsorption device exits the regeneration reduction mode, and the temperature detection device is no longer operated.
Specifically, the oxide adsorption device may be detected to obtain an intake air temperature, that is, the result predicted temperature is obtained according to the intake air temperature, the temperature rise deviation, the preset temperature rise time, the temperature rise deviation, and the temperature change value. However, the oxide adsorbing device has a plurality of reaction regions, and the temperature of each region differs, and the accuracy of the result prediction obtained by taking only the intake air temperature is low.
Therefore, it is necessary to divide the nitrogen oxide adsorption apparatus into a plurality of reaction zones according to the specific size of the oxide adsorption apparatus and the requirements of the user, and each reaction zone is used for detecting the temperature, namely:
the controller 20 is further configured to obtain a plurality of temperature change values, a plurality of initial temperatures, the temperature rise deviation, the preset temperature rise time, and the temperature rise deviation of the plurality of reaction zones in the calibration parameter set based on the intake air temperature, the rotation speed, and the fuel injection amount, obtain a plurality of initial predicted temperatures corresponding to the plurality of reaction zones based on the plurality of temperature change values, the plurality of initial temperatures, the temperature rise deviation, the preset temperature rise time, and the temperature rise deviation, and determine the resulting predicted temperature having a maximum temperature value among the plurality of initial predicted temperatures.
It should be noted that the temperature variation value of one reaction region is obtained based on the difference between the current detected temperature and the initial temperature of the reaction region adjacent to the reaction region (usually, the adjacent region selected to be close to the side of the inlet of the oxide adsorbing device) (the data is obtained when the parameter calibration is performed); the temperature change value of a reaction region can also be obtained based on the difference between the current detected temperature and the initial temperature of the reaction region (the data obtained when the parameter calibration is performed). In general, when parameter calibration is performed, a plurality of reaction regions correspond to a plurality of temperature sensors, and one reaction region corresponds to one temperature sensor.
Referring to fig. 3, fig. 3 is a schematic structural view of an oxide adsorbing device according to the present invention, which has a gas inlet 31, a first reaction region 32, a second reaction region 33, a third reaction region 34, a fourth reaction region 35, and a gas outlet 32. The air inlet is an inlet of the first tail gas, and the air outlet is an exhaust outlet of the second tail gas. Wherein the temperature change value of the second reaction region is obtained based on the currently detected temperature (660 ℃) and the initial temperature (630 ℃) of the first reaction region, i.e., the temperature change value of the second reaction region is 30 ℃. The temperature change value of the second reaction zone may also be obtained based on the currently detected temperature (665 ℃) and the initial temperature (640 ℃) of the second reaction zone, i.e., the temperature change value of the second reaction zone is 25 ℃.
Specifically, the controller 20 is further configured to obtain the plurality of initial predicted temperatures by using a first formula based on the plurality of temperature change values, the plurality of initial temperatures, the temperature rise deviation, the preset temperature rise time, and the temperature rise deviation;
the first formula is as follows:
Tp,j＝Trs,j+Tcvn,j+dt×t+Tosc
wherein, Tp,jAn initial predicted temperature, T, for a jth reaction zone of the plurality of reaction zonesrs,jAn initial temperature, T, corresponding to a jth reaction zone of the plurality of reaction zonescvn,jA temperature change value corresponding to a jth reaction region of the plurality of reaction regions, dt is the temperature rise slope, ToscAnd t is the preset temperature rise time for the temperature rise deviation.
In a specific application, the first detector is a temperature sensor, and the controller is an ECU.
The technical scheme of the invention provides a temperature detection device which is used for a tail gas exhaust system with a nitrogen oxide adsorption device; the temperature detection device includes: a first detector and a controller; wherein the first detector is configured to detect an intake air temperature of the exhaust gas entering the nitrogen oxide adsorption device, wherein the nitrogen oxide adsorption device is in a reduction regeneration mode; the controller is used for obtaining result predicted temperature based on preset temperature rising time, temperature rising slope and the air inlet temperature, and controlling the nitrogen oxide adsorption device to exit the reduction regeneration mode when the result predicted temperature exceeds a preset temperature threshold. Because, nitrogen oxide adsorption equipment carries out the regeneration reduction of tail gas to the tail gas received when handling, nitrogen oxide adsorption equipment needs higher temperature, lead to nitrogen oxide adsorption equipment to begin to age, make the tail gas pollutant content after nitrogen oxide adsorption equipment handles exceed standard, and utilize the temperature-detecting device of this application, nitrogen oxide adsorption equipment is when the prediction temperature exceedes predetermined temperature threshold, temperature-detecting device control nitrogen oxide adsorption equipment withdraws from regeneration reduction mode, make nitrogen oxide adsorption equipment's actual temperature reduce, nitrogen oxide adsorption equipment can not age, and then make the tail gas pollutant content after nitrogen oxide adsorption equipment handles lower, so, utilize the temperature-detecting device of this application, the tail gas pollutant content after nitrogen oxide adsorption equipment handles is lower, can not exceed standard.
Referring to fig. 4, fig. 4 is a flowchart of a first embodiment of the temperature detection method of the present invention, the method being used for a temperature detection device for an exhaust gas system having a nitrogen oxide adsorption device; the temperature detection device includes: a first detector and a controller; the temperature detection method comprises the following steps:
step S11: detecting, with the first detector, an intake air temperature of exhaust gas entering the nitrogen oxide adsorption device, wherein the nitrogen oxide adsorption device is in a reduction regeneration mode;
step S12: and obtaining a result predicted temperature by using the controller based on a preset temperature rise time, a temperature rise slope and the air inlet temperature, and controlling the nitrogen oxide adsorption device to exit the reduction regeneration mode when the result predicted temperature exceeds a preset temperature threshold.
The description of the temperature detecting device is omitted here for brevity.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures made by the content of the present specification and drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. The temperature detection device is characterized by being used for an exhaust system with a nitrogen oxide adsorption device; the temperature detection device includes: a first detector and a controller; wherein the content of the first and second substances,
the first detector is used for detecting the inlet air temperature of the exhaust gas entering the nitrogen oxide adsorption device, wherein the nitrogen oxide adsorption device is in a reduction regeneration mode;
the controller is used for obtaining result predicted temperature based on preset temperature rising time, temperature rising slope, the air inlet temperature, temperature rising deviation and a temperature change value, and controlling the nitrogen oxide adsorption device to exit the reduction regeneration mode when the result predicted temperature exceeds a preset temperature threshold;
the temperature detection device further includes: a second detector and a third detector;
the second detector is used for detecting the rotating speed of the engine;
the third detector is used for detecting the fuel injection quantity of the engine;
the controller is further configured to obtain the temperature rise deviation, the preset temperature rise time, the intake air temperature, the temperature rise deviation and the temperature change value in a pre-stored calibration parameter set based on the intake air temperature, the rotation speed and the fuel injection amount before obtaining the result predicted temperature based on the temperature rise slope, the preset temperature rise time, the intake air temperature, the temperature rise deviation and the temperature change value;
the nitrogen oxide adsorption device is provided with a plurality of reaction areas;
the controller is further configured to obtain a plurality of temperature change values, a plurality of initial temperatures, the temperature rise slope, the preset temperature rise time, and the temperature rise deviation of the plurality of reaction zones in the calibration parameter set based on the intake air temperature, the rotation speed, and the fuel injection amount, obtain a plurality of initial predicted temperatures corresponding to the plurality of reaction zones based on the plurality of temperature change values, the plurality of initial temperatures, the temperature rise slope, the preset temperature rise time, and the temperature rise deviation, and determine the resulting predicted temperature having a maximum temperature value among the plurality of initial predicted temperatures;
the controller is further configured to obtain the plurality of initial predicted temperatures by using a formula one based on the plurality of temperature change values, the plurality of initial temperatures, the temperature rise slope, the preset temperature rise time, and the temperature rise deviation;
the first formula is as follows:
wherein the content of the first and second substances,
is the first of the multiple reaction zonesjThe initial predicted temperature for each reaction zone,
is the first of the multiple reaction zonesjThe initial temperature of each reaction zone corresponds to the temperature,
is the first of the multiple reaction zonesjTemperature change corresponding to each reaction regionThe value of the one or more of the one,
in order to be the temperature-rise slope,
in order for the temperature-rise deviation to be described,tis the preset temperature rise time.
2. The temperature sensing device of claim 1,
the controller is further configured to receive the calibration parameter set sent by a sending end before acquiring, in the calibration parameter set, a plurality of temperature change values, a plurality of initial temperatures, the temperature rising slope, the preset temperature rising time and the temperature rising deviation of the plurality of reaction regions based on the intake air temperature, the rotation speed and the fuel injection amount, and store the calibration parameter set, where the calibration parameter set is obtained by performing parameter calibration on the nitrogen oxide adsorption device with a calibration tool based on a preset intake air temperature, a preset rotation speed, a preset fuel injection amount of the engine and a detected temperature of the nitrogen oxide adsorption device with the plurality of reaction regions.
3. The temperature sensing device of claim 2, wherein the first detector is a temperature sensor.
4. The temperature detection apparatus according to any one of claims 1 to 3, wherein the controller is an ECU.
5. The temperature detection method is characterized by being used for a temperature detection device, wherein the temperature detection device is used for an exhaust system with a nitrogen oxide adsorption device; the temperature detection device includes: a first detector and a controller; the temperature detection method comprises the following steps:
detecting, with the first detector, an intake air temperature of exhaust gas entering the nitrogen oxide adsorption device, wherein the nitrogen oxide adsorption device is in a reduction regeneration mode;
obtaining a result predicted temperature based on a preset temperature rise time, a temperature rise slope, the intake air temperature, a temperature rise deviation and a temperature change value by using the controller, and controlling the nitrogen oxide adsorption device to exit the reduction regeneration mode when the result predicted temperature exceeds a preset temperature threshold;
before obtaining the result predicted temperature based on the temperature rise slope, the preset temperature rise time, the intake air temperature, the temperature rise deviation and the temperature change value, obtaining the temperature rise deviation, the preset temperature rise time, the intake air temperature, the temperature rise deviation and the temperature change value in a pre-stored calibration parameter set by using the controller based on the intake air temperature, the rotating speed and the fuel injection quantity;
the nitrogen oxide adsorption device is provided with a plurality of reaction areas;
the obtaining of the result predicted temperature based on a preset temperature rise time, a temperature rise slope, the intake air temperature, a temperature rise deviation, and a temperature change value by the controller includes:
obtaining, by the controller, a plurality of temperature change values, a plurality of initial temperatures, the temperature rise slope, the preset temperature rise time, and the temperature rise deviation of the plurality of reaction zones in the calibration parameter set based on the intake air temperature, the rotation speed, and the fuel injection amount, obtaining a plurality of initial predicted temperatures corresponding to the plurality of reaction zones based on the plurality of temperature change values, the plurality of initial temperatures, the temperature rise slope, the preset temperature rise time, and the temperature rise deviation, and determining the resulting predicted temperature having a maximum temperature value among the plurality of initial predicted temperatures;
and obtaining a plurality of initial predicted temperatures corresponding to the plurality of reaction zones based on the plurality of temperature change values, the plurality of initial temperatures, the temperature rise slope, the preset temperature rise time and the temperature rise deviation, including:
obtaining a plurality of initial predicted temperatures by using a first formula based on the plurality of temperature change values, the plurality of initial temperatures, the temperature rising slope, the preset temperature rising time and the temperature rising deviation;
the first formula is as follows:
wherein the content of the first and second substances,
is the first of the multiple reaction zonesjThe initial predicted temperature for each reaction zone,
is the first of the multiple reaction zonesjThe initial temperature of each reaction zone corresponds to the temperature,
is the first of the multiple reaction zonesjThe temperature change value corresponding to each reaction area,
in order to be the temperature-rise slope,
in order for the temperature-rise deviation to be described,tis the preset temperature rise time.
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