CN113550817B - Central temperature correction method and system of tail gas treatment device and readable storage medium - Google Patents
Central temperature correction method and system of tail gas treatment device and readable storage medium Download PDFInfo
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- CN113550817B CN113550817B CN202010333745.5A CN202010333745A CN113550817B CN 113550817 B CN113550817 B CN 113550817B CN 202010333745 A CN202010333745 A CN 202010333745A CN 113550817 B CN113550817 B CN 113550817B
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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
- F01N11/005—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 the temperature or pressure being estimated, e.g. by means of a theoretical model
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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 provides a method and a system for correcting the central temperature of an exhaust gas treatment device and a readable storage medium, wherein an engine exhaust gas model is pre-established and used for calculating the temperature change rate caused by chemical reaction in the exhaust gas treatment device; the method comprises the following steps: monitoring the content of emissions participating in the chemical reaction in the engine exhaust; calculating the temperature change rate caused by the internal chemical reaction of the tail gas treatment device according to the engine tail gas model; and calculating the temperature variation caused by the internal chemical reaction of the tail gas treatment device, and correcting the central temperature of the tail gas treatment device, so that the monitoring precision of the central temperature of the tail gas treatment device is improved, and the high-temperature failure and damage of the tail gas treatment device are effectively avoided.
Description
Technical Field
The invention relates to the technical field of engine emission treatment, in particular to a method and a system for correcting the central temperature of an exhaust gas treatment device and a readable storage medium.
Background
The exhaust temperature of an automobile engine is an important parameter for monitoring the working condition of the engine, the engine is ensured to work in a safe range, and the service life of parts of an exhaust system is influenced by the overhigh exhaust temperature, even the exhaust system is damaged. An Engine Management System (EMS) usually monitors the temperature of exhaust System components in real time by establishing an Engine exhaust temperature model and matching reasonable parameters, and performs necessary protection on the exhaust System components, such as an exhaust manifold, a turbocharger, and an exhaust gas treatment device. Examples of the exhaust gas treatment device include a three-way catalyst, a four-way catalyst, and a particle trap.
Taking a three-way catalyst as an example, in the prior art, an exhaust temperature model of an engine management system EMS mainly simulates the center temperature of the catalyst according to the operating condition of an engine. The catalyst is an important part in an engine exhaust system, bears the function of purifying engine exhaust, and promotes harmful gases such as carbon monoxide CO, hydrocarbon HC, nitrogen oxide NOx and the like in the engine exhaust to carry out chemical reaction by taking a noble metal coating of a catalyst carrier as a catalyst to generate harmless water, carbon dioxide and nitrogen. The chemical reaction generates a large amount of heat, resulting in an increase in the temperature of the catalyst core. However, the existing exhaust temperature model cannot monitor the temperature change caused by chemical reaction in real time, so if the condition that the risk cannot be identified by EMS due to excessive hydrocarbon accumulation of the catalyst occurs, the condition that the central temperature of the catalyst is easily out of limit is easily caused, and the aging of the catalyst is accelerated until the catalyst is damaged.
Disclosure of Invention
The invention aims to provide a method and a system for correcting the central temperature of a tail gas treatment device and a readable storage medium, so as to improve the monitoring precision of the central temperature of the tail gas treatment device and effectively avoid high-temperature failure and damage of the tail gas treatment device. The specific technical scheme is as follows:
in order to achieve the above technical object, the present invention provides a method for correcting a center temperature of an exhaust gas treatment device, which comprises pre-establishing an engine exhaust gas model for calculating a temperature change rate caused by a chemical reaction occurring in the exhaust gas treatment device;
the method comprises the following steps:
monitoring the content of emissions participating in the chemical reaction in the engine exhaust;
calculating the temperature change rate caused by the internal chemical reaction of the tail gas treatment device according to the engine tail gas model;
and calculating the temperature variation caused by the internal chemical reaction of the tail gas treatment device, and correcting the central temperature of the tail gas treatment device.
Optionally, the emissions include at least one of carbon monoxide, nitric oxide and hydrocarbons.
Optionally, the monitoring of the content of emissions participating in the chemical reaction in the engine exhaust comprises:
obtaining the content of the emissions participating in the chemical reaction in the engine exhaust through an emissions content model of an engine management system; or the like, or, alternatively,
the content of emissions participating in the chemical reaction in the engine exhaust is monitored by a sensor.
Optionally, the emission content model is established according to engine speed, engine load, ignition advance angle and air-fuel ratio of the mixture.
Optionally, the engine exhaust model is established according to the total reaction heat of each emission participating in the chemical reaction, and the engine exhaust model comprises the following matching parameters: correction factors relating to air-fuel ratio and conversion efficiency, and dynamic condition correction factors relating to engine speed and load.
Optionally, the emissions comprise: carbon monoxide, nitric oxide and hydrocarbons;
the engine exhaust model further comprises the following matching parameters: the calorific value of the hydrocarbons, the proportion of carbon monoxide and nitric oxide reacting in the nitric oxide disappearance reaction.
Optionally, the engine exhaust model is:
wherein the content of the first and second substances,
indicating the rate of temperature change caused by chemical reactions within the exhaust treatment device,
mass flow rates of carbon monoxide, nitrogen monoxide and hydrocarbons, q, respectively, in the engine exhaust HC The calorific value of hydrocarbon, r is the ratio of carbon monoxide to nitric oxide in the reaction of nitric oxide disappearance, f (lambda, eta) is a correction coefficient relating to the air-fuel ratio and the conversion efficiency, and f (nmot, rl) is a dynamic condition correction coefficient relating to the engine speed and load.
Based on the same inventive concept, the invention also provides a central temperature correction system of the tail gas treatment device, which comprises:
the model establishing module is used for establishing an engine tail gas model in advance, and the engine tail gas model is used for calculating the temperature change rate caused by chemical reaction in the tail gas treatment device;
the monitoring module is used for monitoring the content of the emissions participating in the chemical reaction in the engine exhaust;
the calculation module is used for calculating the temperature change rate caused by the internal chemical reaction of the tail gas treatment device according to the engine tail gas model;
and the correction module is used for calculating the temperature variation caused by the internal chemical reaction of the tail gas treatment device and correcting the central temperature of the tail gas treatment device.
Optionally, the emissions include at least one of carbon monoxide, nitric oxide and hydrocarbons.
Optionally, the method for monitoring the content of the emissions participating in the chemical reaction in the engine exhaust by the monitoring module comprises:
obtaining the content of the emissions participating in the chemical reaction in the engine exhaust through an emissions content model of an engine management system; or the like, or a combination thereof,
the content of emissions participating in the chemical reaction in the engine exhaust is monitored by a sensor.
Optionally, the emission content model is established according to engine speed, engine load, ignition advance angle and air-fuel ratio of the mixture.
Optionally, the engine exhaust model is established according to the total reaction heat of the emissions participating in the chemical reaction, and the engine exhaust model comprises the following matching parameters: correction factors relating to air-fuel ratio and conversion efficiency, and dynamic condition correction factors relating to engine speed and load.
Optionally, the emissions comprise: carbon monoxide, nitric oxide and hydrocarbons;
the engine exhaust model further comprises the following matching parameters: the calorific value of the hydrocarbon, the proportion of carbon monoxide and nitric oxide reacted in the nitric oxide disappearance reaction.
Optionally, the engine exhaust model is:
wherein the content of the first and second substances,
indicating the rate of temperature change caused by chemical reactions within the exhaust treatment device,
mass flow rates of carbon monoxide, nitrogen monoxide and hydrocarbons in the engine exhaust, q HC The calorific value of hydrocarbon, r is the ratio of carbon monoxide to nitric oxide in the reaction of nitric oxide disappearance, f (lambda, eta) is a correction coefficient relating to the air-fuel ratio and the conversion efficiency, and f (nmot, rl) is a dynamic condition correction coefficient relating to the engine speed and load.
Based on the same inventive concept, the present invention also provides a readable storage medium, on which a computer program is stored, which, when executed by a processor, can implement the method for correcting the core temperature of an engine exhaust gas treatment device according to the present invention.
Compared with the prior art, the scheme provided by the invention has the advantages that the engine tail gas model is utilized to correct the central temperature of the catalyst, and the temperature change rate and the generated temperature rise caused by the internal reaction of the catalyst under the steady-state working condition and the dynamic working condition of the engine can be accurately calculated, so that the precision of the central temperature model of the catalyst is improved, the catalyst is monitored in real time and protected in time, the risk of damage to the catalyst caused by severe chemical reaction of the catalyst is avoided, and the after-sale maintenance cost is reduced. Meanwhile, when the method is applied to actual driving circulation, unnecessary part enrichment protection is avoided due to more accurate catalytic converter model precision, and fuel economy is effectively improved.
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 drawings without creative efforts.
FIG. 1 is a physical model diagram of a catalyst;
FIG. 2 is a simplified logic diagram of FIG. 1;
FIG. 3 is a schematic flow chart illustrating a method for correcting a core temperature of an exhaust gas treatment device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a central temperature correction system of an exhaust gas treatment device according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings in order to make the purpose and features of the present invention more comprehensible, however, the present invention may be implemented in various forms and should not be limited to the embodiments described above. Furthermore, it will be understood that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer program instructions. It is well known to those skilled in the art that implementation by hardware, by software, and by a combination of software and hardware are equivalent.
The technical scheme of the invention is used for correcting the central temperature of the tail gas treatment device of the engine, is particularly suitable for tail gas treatment devices such as a three-way catalyst, a four-way catalyst, a particle catcher and the like, and does not limit the specific type of the tail gas treatment device.
Hereinafter, the method for correcting the center temperature of the exhaust gas treatment device according to the present invention will be described in detail by taking a three-way catalyst (hereinafter, referred to as a catalyst) as an example.
As described in the background, the chemical reactions of oxidation and reduction that continue to occur inside the catalyst release a large amount of heat, causing the temperature in the center of the catalyst to rise significantly. Referring to fig. 1 and 2, the central temperature of the catalyst is mainly affected by the heat Q transferred from the inlet of the catalyst E1 Heat Q generated by oxidation-reduction reaction in the catalyst ExoA Heat loss Q from catalyst to atmosphere by heat radiation HLA And the heat Q transferred by the catalyst to the downstream component E2 Thus, therefore, it is
In general, the catalyst inlet temperature T is compared E1 Center temperature T of catalyst BrA Between 50K and 200K higher. The temperature of the excess part is mainly related to the heat generated by the oxidation-reduction reaction inside the catalyst, the heat loss caused by the heat radiation of the catalyst to the atmosphere, and the like. Due to the structural characteristics of the catalyst itself, the rise in the temperature in the center of the catalyst is mainly affected by the internal redox reactions. Further analysis shows that the higher the content of hydrocarbons such as CO and HC in the engine exhaust gas is, the more severe the oxidation-reduction reaction inside the catalyst is, and the higher the catalyst center temperature is.
The catalyst is different from other parts of the exhaust system, and the central temperature of the catalyst has a great relationship with the heat of chemical reaction of the emissions such as hydrocarbon in the catalyst. The emissions such as hydrocarbon in the catalyst are continuously accumulated and simultaneously reacted, so the working condition of the engine plays an important role in the accumulation of the emissions in the catalyst. In other words, even if the engine is operated under the same operating conditions, its center temperature may vary greatly due to the different hydrocarbon content inside the catalyst. Therefore, acquiring the amount of temperature change caused by the heat generated by the chemical reaction inside the catalyst plays an important role in monitoring the center temperature of the catalyst.
Based on the above principle, the present invention focuses on the temperature change caused by the heat generated by the chemical reaction inside the catalyst, and an engine exhaust model for calculating the temperature change rate caused by the chemical reaction occurring in the exhaust gas treatment device is established in advance according to the chemical reaction.
Specifically, the engine exhaust model is established based on a total reaction heat of respective emissions participating in the chemical reaction, wherein the emissions include at least one of carbon monoxide, nitric oxide, and hydrocarbons. The engine exhaust model comprises the following matching parameters: correction factors relating to air-fuel ratio and conversion efficiency, and dynamic condition correction factors relating to engine speed and load.
Preferably, the emissions include carbon monoxide, nitric oxide and hydrocarbons, and the engine exhaust model further includes the following matching parameters: the calorific value of the hydrocarbons, the proportion of carbon monoxide and nitric oxide reacting in the nitric oxide disappearance reaction.
The following describes the process of establishing the engine exhaust model.
Considering that the chemical reaction inside the catalyst is very complicated, many reactions are carried out simultaneously, and the reactions have great relation with the components of the exhaust gas, the temperature of the catalyst, the activity of the coated catalyst and the like. Even if the tail gas contains a small amount of a plurality of gases with higher content, the chemical reaction which the tail gas participates in is carried out step by step. According to the first law of thermodynamics, the law of gauss, the heat of the final chemical reaction follows the conservation of energy for the chemical reaction that proceeds stepwise. The content of the engine tail gas is higherHigh emissions include carbon monoxide CO, hydrocarbons HC, nitrogen oxides (including NO and NO) X ). In the engine exhaust gas model establishment, modeling based on a chemical reaction in which heat generation is high, for example, a chemical reaction in which at least one of carbon monoxide, nitrogen monoxide, and hydrocarbons participates may be considered as a basis for modeling. Preferably, the chemical reactions in which all three of carbon monoxide, nitric oxide and hydrocarbons participate are taken together as the basis for modeling. The following describes how to build the engine exhaust model by taking the chemical reactions in which carbon monoxide, nitric oxide and hydrocarbon all participate as a modeling basis.
The invention researches the exothermic reaction of CO and HC by optimizing the boundary condition of the chemical reaction in the catalyst, aims to obtain the relationship between the content of hydrocarbon and the chemical reaction heat of the catalyst, and considers the steady-state working condition of the engine in the heat engine state:
1) The inside of the catalyst is in a constant pressure and constant volume state, namely the expansion work of chemical reaction is neglected;
2) The conversion efficiency eta of the catalyst is higher, and eta of different engine working conditions is basically constant;
3) Only the total chemical reaction heat of the three high component gas contents of CO, HC and NO is considered;
4) Other ideal boundary conditions.
CO and HC are the main intermediates generated during the combustion of chemical fuels, the total amount of which reacts as:
NO is a main component of nitrogen oxides in exhaust gas, and performs a reduction reaction with a reducing agent such as CO, and thus plays a certain role in suppressing the oxidation reaction of CO and HC. The total amount of NO reacts as:
wherein hydrogen in the reactants is H 2 From the water gas reaction or the steam reforming reaction.
The relationship between the reaction and the air-fuel ratio of the engine mixture is large: when the engine is running with an equivalent air-fuel ratio mixture, the reaction end product is mostly H 2 0 and CO 2 (ii) a When the engine is running at a leaner mixture (non-misfire boundary), the rate of disappearance of NO will be significantly reduced and CO and HC will be fully reacted; when the engine is running rich (not on the misfire boundary), the amount of CO and HC reacted is limited by the free oxygen concentration, and NO may be reduced by the reductants CO, H 2 And the more thorough reduction reaction is carried out to generate ammonia.
According to standard molar enthalpy of formation of reactants and products
The heat of chemical reaction for the above four total reactions can be calculated as follows, i.e., the heat of reaction is equal to the difference between the product generation break and the reaction generation break.
Obtaining CO and CO by looking up a table 2 、NO、H 2 Standard molar enthalpy of formation of 0, as in the following table; the HC chemical formula is complex and unfixed, is difficult to express by one chemical formula, and needs to be measured and matched in an engine.
Available, total heat of reaction of CO
Total heat of reaction of NO
The HC chemical formula is complex and unfixed, and is difficult to express by one chemical formula, and the total reaction heat is measured in the experiment and used
And (4) showing.
To this end, the rate of change of the heat generated by the chemical reaction inside the catalyst
Can be obtained by the following formula:
wherein, f CO (λ)、f NO (λ)、f HC (lambda) calorific value correction coefficients of CO, NO, HC for air-fuel ratios, M CO 、M NO 、M HC The molar masses of CO, NO and HC, respectively.
After converting the molar mass on the right of equation 1 above to mass, the equation of the heat without phase change is combined, and the above equation can be expressed as:
in the formula (I), the compound is shown in the specification,
is the rate of temperature change caused by the catalyst reaction, in K/s;
f CO (λ)、f NO (λ)、f HC (λ) the air-fuel ratio heat value correction coefficients for CO, NO, HC, respectively, expressed as f (λ);
r, the ratio of CO + NO reaction in NO disappearance reaction is 0-1, and the value is related to the air-fuel ratio;
q HC HC, heat value in kJ/g;
eta, the conversion efficiency of the catalyst is between 0 and 1;
f (nmot, rl), dynamic condition correction factors related to engine speed and load.
It can be understood that the mass flow rate of the engine emission is directly related to the engine speed, the engine load, the ignition advance angle, the air-fuel ratio of the mixed gas and the like, and a unit mass flow rate with higher precision can be obtained through an emission mathematical model of EMS (enhanced message service)
And the mass m of the catalyst in a specific catalyst state BrA Specific heat capacity cp BrA The conversion efficiency η is a relatively fixed value.
After equation 2 is simplified, we get:
thus, equation 3 is the engine exhaust model. Wherein, the variables which need to be input by the engine exhaust model are as follows: mass flow of CO, NO and HC
m HC In kg/s. The matching parameters include: heating value q of hydrocarbon emissions HC The unit is kJ/g; the ratio r of CO + NO reaction in NO disappearance reaction is between 0 and 1, and the value is related to the air-fuel ratio; correction system related to air-fuel ratio and conversion efficiency of catalystThe number f (λ, η) in K/J; and (3) a dynamic working condition correction coefficient f (nmot, rl) related to the engine speed and the load, wherein the correction is not performed in a steady-state working condition f (nmot, rl) =1. The variables output by the model are the rate of temperature change caused by chemical reactions in the catalyst:
the unit is K/s.
From this, the rate of temperature change caused by the chemical reaction inside the catalyst can be calculated by equation 3. The engine exhaust gas model considers three emissions of CO, NO and HC, and in other embodiments, gas components in the model may be increased or decreased, for example, only the CO and HC are considered, and a corresponding engine exhaust gas model may be established by referring to the above description, which is not described herein again.
In practical applications, referring to fig. 3, an embodiment of the present invention provides a method for correcting a central temperature of an exhaust gas treatment device, which includes the following steps:
s101, monitoring the content of the emissions participating in the chemical reaction in the engine exhaust;
s102, calculating a temperature change rate caused by a chemical reaction in the tail gas treatment device according to the engine tail gas model;
s103, calculating the temperature variation caused by the internal chemical reaction of the tail gas treatment device, and correcting the central temperature of the tail gas treatment device.
As described above, the engine exhaust gas model may be established based on at least one of carbon monoxide, nitric oxide and hydrocarbons, and accordingly, the content of at least one of carbon monoxide, nitric oxide and hydrocarbons may be monitored in step S101.
In particular, the content of emissions participating in the chemical reaction in the exhaust gas of the engine may be monitored by means of a sensor, i.e. a sensor is provided for monitoring the content of the respective emissions flowing into the catalyst.
Preferably, the content of the emissions participating in the chemical reaction in the engine exhaust gas can be obtained by an emissions content model of an engine management system. As previously described, the mass flow of engine emissions is directly related to engine speed, engine load, spark advance, mixture air-fuel ratio, etc., and therefore an emissions content model for an engine management system may be established based on engine speed, engine load, spark advance, mixture air-fuel ratio, etc. In this way, when the emission content is monitored, the emission content with higher precision can be obtained through the emission content model, and no additional expensive sensor is needed to be added, so that the cost is reduced. Meanwhile, the heat generated by the chemical reaction in the catalyst under different working conditions can be accurately predicted by establishing an engine emission content model, so that the precision of the catalyst center temperature model is improved, the real-time monitoring is realized, and the catalyst is protected in time.
In step S102, the monitored emission content is input to the engine exhaust model for calculating a temperature change rate caused by a chemical reaction inside the catalyst. For example, the mass flow rates of CO, NO and HC to be monitored
m HC And inputting the formula 3, and simultaneously obtaining the values of the matching parameters under different working conditions, thereby calculating the temperature change rate caused by the internal chemical reaction of the catalytic converter according to the formula 3.
After the temperature change rate caused by the chemical reaction inside the catalyst is calculated, the temperature change amount caused by the chemical reaction inside the catalyst can be further calculated, and the central temperature of the catalyst monitored by the existing scheme is corrected according to the temperature change amount.
According to the scheme provided by the invention, the engine tail gas model is used for correcting the central temperature of the catalyst, and the temperature change rate and the generated temperature rise caused by the internal reaction of the catalyst under the steady-state working condition and the dynamic working condition of the engine can be accurately calculated, so that the precision of the central temperature model of the catalyst is improved, the catalyst is monitored in real time and protected in time, the risk of damage to the catalyst caused by severe chemical reaction of the catalyst is avoided, and the after-sale maintenance cost is reduced. Meanwhile, when the method is applied to actual driving circulation, unnecessary part enrichment protection is avoided due to more accurate catalytic converter model precision, and fuel economy is effectively improved.
Referring to fig. 4, an embodiment of the present invention further provides a system for correcting a central temperature of an exhaust gas treatment device, including:
a model building module 200 for pre-building an engine exhaust model for calculating a rate of temperature change caused by a chemical reaction occurring within the exhaust treatment device;
a monitoring module 201 for monitoring the content of emissions participating in the chemical reaction in the engine exhaust;
a calculating module 202, configured to calculate a temperature change rate caused by a chemical reaction inside the exhaust gas treatment device according to the engine exhaust gas model;
and the correcting module 203 is configured to calculate a temperature variation caused by a chemical reaction inside the exhaust gas treatment device, and correct the center temperature of the exhaust gas treatment device.
Preferably, the emissions include at least one of carbon monoxide, nitric oxide and hydrocarbons.
Preferably, the method for monitoring the content of the emissions participating in the chemical reaction in the engine exhaust by the monitoring module 201 comprises:
obtaining the content of the emissions participating in the chemical reaction in the engine exhaust through an emissions content model of an engine management system; or the like, or, alternatively,
the content of emissions participating in the chemical reaction in the engine exhaust is monitored by a sensor.
Preferably, the emission content model is established according to engine speed, engine load, ignition advance angle and air-fuel ratio of mixture gas.
Preferably, the engine exhaust model is established according to the total reaction heat of each emission participating in the chemical reaction, and comprises the following matching parameters: correction factors relating to air-fuel ratio and conversion efficiency, and dynamic condition correction factors relating to engine speed and load.
Preferably, the emissions comprise: carbon monoxide, nitric oxide and hydrocarbons;
the engine exhaust model further comprises the following matching parameters: the calorific value of the hydrocarbon, the proportion of carbon monoxide and nitric oxide reacted in the nitric oxide disappearance reaction.
Preferably, the engine exhaust model is as follows:
wherein, the first and the second end of the pipe are connected with each other,
indicating the rate of temperature change caused by chemical reactions within the exhaust treatment device,
mass flow rates of carbon monoxide, nitrogen monoxide and hydrocarbons in the engine exhaust, q HC The calorific value of hydrocarbon, r is the ratio of carbon monoxide to nitric oxide in the reaction of nitric oxide disappearance, f (lambda, eta) is a correction coefficient relating to the air-fuel ratio and the conversion efficiency, and f (nmot, rl) is a dynamic condition correction coefficient relating to the engine speed and load.
Based on the same inventive concept, an embodiment of the present invention further provides a readable storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, can implement the method for correcting the central temperature of an exhaust gas treatment device according to an embodiment of the present invention.
Aspects of the present invention are described herein with reference to flowchart illustrations and/or block diagrams of methods, systems, and readable storage media according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer programs. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the programs, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. Such a computer program may also be stored in a readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the readable storage medium storing the computer program comprises an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer program may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the computer program which executes on the computer, other programmable apparatus or other devices implements the functions/acts specified in the flowchart and/or block diagram block or blocks.
It should be noted that, in this specification, all the embodiments are described in a related manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on differences from other embodiments. In particular, as for the system and readable storage medium embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference may be made to some descriptions of the method embodiments for relevant points.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (7)
1. A method for correcting the central temperature of an exhaust gas treatment device is characterized in that an engine exhaust gas model is established in advance, and the engine exhaust gas model is used for calculating the temperature change rate caused by chemical reaction in the exhaust gas treatment device;
the method comprises the following steps:
monitoring the content of emissions participating in the chemical reaction in the engine exhaust;
calculating the temperature change rate caused by the internal chemical reaction of the tail gas treatment device according to the engine tail gas model;
calculating the temperature variation caused by the internal chemical reaction of the tail gas treatment device, and correcting the central temperature of the tail gas treatment device;
the engine exhaust model is established according to the total reaction heat of each emission participating in the chemical reaction, and comprises the following matching parameters: correction coefficients relating to air-fuel ratio and conversion efficiency, dynamic condition correction coefficients relating to engine speed and load;
the monitoring of the content of emissions participating in the chemical reaction in the engine exhaust comprises:
obtaining the content of the emissions participating in the chemical reaction in the engine exhaust through an emissions content model of an engine management system; the emission content model is established according to the engine speed, the engine load, the ignition advance angle and the air-fuel ratio of the mixture.
2. The method of center temperature correction for an exhaust gas treatment device according to claim 1, wherein the emissions include at least one of carbon monoxide, nitric oxide, and hydrocarbons.
3. The method of center temperature correction of an exhaust gas treatment device according to claim 1, wherein the emissions include: carbon monoxide, nitric oxide and hydrocarbons;
the engine exhaust model further comprises the following matching parameters: the calorific value of the hydrocarbons, the proportion of carbon monoxide and nitric oxide reacting in the nitric oxide disappearance reaction.
4. The center temperature correction method of an exhaust gas treatment device according to claim 1, wherein the engine exhaust gas model is:
wherein, the first and the second end of the pipe are connected with each other,
indicating the rate of temperature change caused by chemical reactions within the exhaust treatment device,
mass flow rates of carbon monoxide, nitrogen monoxide and hydrocarbons in the engine exhaust, q HC The calorific value of hydrocarbon, r is the ratio of carbon monoxide to nitric oxide in the reaction of nitric oxide disappearance, f (lambda, eta) is a correction coefficient relating to the air-fuel ratio and the conversion efficiency, and f (nmot, rl) is a dynamic condition correction coefficient relating to the engine speed and load.
5. A central temperature correction system of an exhaust gas treatment device, comprising:
the model establishing module is used for establishing an engine tail gas model in advance, and the engine tail gas model is used for calculating the temperature change rate caused by chemical reaction in the tail gas treatment device;
the monitoring module is used for monitoring the content of the emissions participating in the chemical reaction in the engine exhaust;
the calculation module is used for calculating the temperature change rate caused by the internal chemical reaction of the tail gas treatment device according to the engine tail gas model;
the correction module is used for calculating the temperature variation caused by the internal chemical reaction of the tail gas treatment device and correcting the central temperature of the tail gas treatment device;
the engine exhaust model is established according to the total reaction heat of each emission participating in the chemical reaction, and comprises the following matching parameters: correction coefficients relating to air-fuel ratio and conversion efficiency, dynamic condition correction coefficients relating to engine speed and load;
the monitoring module is used for acquiring the content of the emissions participating in the chemical reaction in the engine tail gas through an emissions content model of an engine management system; the emission content model is established according to the engine speed, the engine load, the ignition advance angle and the air-fuel ratio of the mixture.
6. The core temperature correction system for an exhaust gas treatment device according to claim 5, wherein the emissions comprise at least one of carbon monoxide, nitric oxide, and hydrocarbons.
7. A readable storage medium on which a computer program is stored, wherein the computer program, when executed by a processor, is capable of implementing the method for correcting the core temperature of an exhaust gas treatment device according to any one of claims 1 to 4.
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