CN116658280A - Control method and device and vehicle - Google Patents
Control method and device and vehicle Download PDFInfo
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- CN116658280A CN116658280A CN202310794106.2A CN202310794106A CN116658280A CN 116658280 A CN116658280 A CN 116658280A CN 202310794106 A CN202310794106 A CN 202310794106A CN 116658280 A CN116658280 A CN 116658280A
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- lnt
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000007613 environmental effect Effects 0.000 claims abstract description 23
- 238000002485 combustion reaction Methods 0.000 claims abstract description 15
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 190
- 230000006870 function Effects 0.000 claims description 117
- 230000001276 controlling effect Effects 0.000 claims description 49
- 238000001179 sorption measurement Methods 0.000 claims description 38
- 230000000875 corresponding effect Effects 0.000 claims description 33
- 238000003795 desorption Methods 0.000 claims description 22
- 230000003197 catalytic effect Effects 0.000 claims description 10
- 239000013618 particulate matter Substances 0.000 claims description 8
- 230000002596 correlated effect Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 230000004913 activation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
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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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1602—Temperature of exhaust gas apparatus
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The application discloses a control method, a control device and a vehicle, wherein the control method comprises the following steps: determining a target LNT specified temperature corresponding to the current environmental parameter of the vehicle based on the corresponding relation between the environmental parameter and the LNT specified temperature; the vehicle is controlled to execute the target function based on the target LNT specified temperature such that the execution frequency of the target function is less than the specified frequency. The method can reduce the number of insufficient combustion times of the engine, thereby effectively reducing the PM emission of the engine and avoiding exceeding the standard of the PM emission.
Description
Technical Field
The application relates to the field of automobile exhaust treatment, in particular to a control method, a control device and a vehicle.
Background
Existing light diesel vehicles generally adopt an after-treatment technical route of lnt+cdpf+scr to treat exhaust gas, and the specific exhaust gas treatment mode can be seen in fig. 1. So-called diesel exhaust aftertreatment (Lean-bum NO x Trap, LNT), also known as a nox Trap, is based on the adsorption of Nitrogen Oxides (NO) in the exhaust gases of vehicles by rare metals x ) And generating reductant in the exhaust passage by controlling engine combustion parameters to utilize the reductant to treat NO in the LNT x The desorption and reduction are carried out, so that the effective treatment of the tail gas of the vehicle is realized, and specifically, the working principle of the LNT is shown in figure 2.
However, in the current vehicle exhaust treatment process using the LNT, the emission amount of particulate matters (Particulate Matter, PM) may be out of standard, thereby reducing the exhaust treatment effect of the vehicle.
Disclosure of Invention
The application provides a control method, a control device and a vehicle, and aims to control PM emission to be out of standard.
In order to achieve the above object, the present application provides the following technical solutions:
a control method, comprising:
determining a target LNT specified temperature corresponding to the current environmental parameter of the vehicle based on the corresponding relation between the environmental parameter and the LNT specified temperature; the LNT specified temperature is used for representing the LNT bed temperature which can enable the nitrogen oxide desorption reduction efficiency of the LNT to be larger than a standard value; the LNT bed temperature represents a temperature of a catalytic bed of the LNT;
controlling the vehicle to execute a target function based on the target LNT specified temperature so that the execution frequency of the target function is less than a specified frequency; the target function triggers the desorption and reduction of nitrogen oxides in the LNT by controlling the combustion parameters of the engine; the execution frequency is positively correlated with the particulate matter emission of the engine.
Optionally, controlling the vehicle to execute the target function based on the target LNT specified temperature includes:
obtaining a current LNT bed temperature of the vehicle;
and if the current LNT bed temperature is greater than or equal to the target LNT specified temperature, controlling the vehicle to execute a target function.
Optionally, if the current LNT bed temperature is greater than or equal to the target LNT specified temperature, controlling the vehicle to execute the target function includes:
if the current LNT bed temperature is greater than or equal to the target LNT specified temperature, acquiring the running parameters of the vehicle;
and controlling the vehicle to execute a target function based on the operation parameters of the vehicle.
Optionally, the operating parameter includes an nox adsorption amount of the LNT;
controlling the vehicle to perform a target function based on an operating parameter of the vehicle, comprising:
controlling the vehicle to execute a target function based on the nitrogen oxide adsorption amount of the LNT so that the nitrogen oxide adsorption efficiency of the LNT is greater than a specified efficiency; the nitrogen oxide adsorption efficiency is inversely related to a nitrogen oxide discharge amount of the vehicle.
Optionally, controlling the vehicle to execute the target function based on the nox adsorption amount of the LNT includes:
determining a target nox storage ratio based on the nox adsorption amount of the LNT; the target nox storage ratio includes a ratio of the nox adsorption amount to a specified nox adsorbable amount of the LNT;
and if the target NOx storage ratio is greater than or equal to a specified ratio, controlling the vehicle to execute a target function.
Optionally, the operating parameter includes an operating load of the engine;
controlling the vehicle to perform a target function based on an operating parameter of the vehicle, comprising:
the vehicle is controlled to execute a target function based on an operating load of the engine so that a power performance of the vehicle is not affected by the target function.
Optionally, controlling the vehicle to perform a target function based on an operating load of the engine includes:
obtaining an operating speed of the engine and the target nox storage ratio;
determining a target engine designated first load corresponding to the operating speed and corresponding to the target nitrogen oxide storage ratio based on a correspondence of the engine speed, the nitrogen oxide storage ratio, and the engine designated first load;
and if the running load is greater than or equal to the first specified load of the target engine, controlling the vehicle to execute a target function.
Optionally, controlling the vehicle to perform a target function based on an operating load of the engine includes:
obtaining an operating speed of the engine and the target nox storage ratio;
determining a target engine designated second load corresponding to the running speed based on a corresponding relation between the engine speed and the engine designated second load;
and if the running load is less than or equal to the second load appointed by the target engine, controlling the vehicle to execute a target function.
A control apparatus comprising:
the parameter determining unit is used for determining a target LNT specified temperature corresponding to the current environmental parameter of the vehicle based on the corresponding relation between the environmental parameter and the LNT specified temperature; the LNT specified temperature is used for representing the LNT bed temperature which can enable the nitrogen oxide desorption reduction efficiency of the LNT to be larger than a standard value; the LNT bed temperature represents a temperature of a catalytic bed of the LNT;
a function execution unit configured to control the vehicle to execute a target function based on the target LNT specified temperature so that an execution frequency of the target function is smaller than a specified frequency; the target function triggers the desorption and reduction of nitrogen oxides in the LNT by controlling the combustion parameters of the engine; the execution frequency is positively correlated with the particulate matter emission of the engine.
A vehicle, comprising: a processor, a memory, and a bus; the processor is connected with the memory through the bus;
the memory is used for storing a program, and the processor is used for running the program, wherein the program is executed by the processor to execute the control method.
According to the technical scheme provided by the application, the target LNT specified temperature corresponding to the current environmental parameter of the vehicle is determined based on the corresponding relation between the environmental parameter and the LNT specified temperature, and the vehicle is controlled to execute the target function based on the target LNT specified temperature, so that the execution frequency of the target function is smaller than the specified frequency, the number of times of insufficient combustion of the engine is reduced, the PM emission of the engine is effectively reduced, and the PM emission exceeding standard is avoided.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an exhaust treatment method according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an LNT operating principle according to an embodiment of the present application;
FIG. 3 shows an NO provided by an embodiment of the present application x Adsorption efficiency and NO x Schematic of the association relationship of adsorption quantity;
FIG. 4 shows an NO provided by an embodiment of the present application x Schematic diagram of association relation between desorption reduction efficiency and LNT bed temperature;
FIG. 5 is a schematic flow chart of a control method according to an embodiment of the present application;
FIG. 6 is a flow chart of another control method according to an embodiment of the present application;
FIG. 7 is a schematic logic diagram of a control method according to an embodiment of the present application;
fig. 8 is a schematic diagram of a control device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Based on the practice of LNT in vehicle exhaust treatment, the applicant found that: the catalytic bed in the LNT can adsorb NO in the tail gas when the engine is in lean combustion condition x Waiting for NO x After the adsorption quantity reaches a value exceeding a specified value, the combustion parameters of the engine need to be adjusted so that the engine is in a rich condition, and the LNT can adsorb NO under the rich condition x Desorption reduction of NO of LNT x Obvious adsorption efficiencyIs subjected to NO x Influence of adsorption amount, in particular, NO x Adsorption efficiency and NO x Adsorption quantity (i.e. NO) x Memory amount), as shown in fig. 3, and in addition, the NO of the LNT x The desorption reduction efficiency is also significantly affected by the temperature of the catalytic bed of the LNT (i.e. the LNT bed temperature), in particular, NO x As shown in fig. 4, the relationship between desorption reduction efficiency and LNT bed temperature is further that, due to the NO of the LNT x The desorption reduction process is carried out under a rich condition, the combustion effect of the engine under the rich condition is poor (usually because the engine is not fully combusted), and the NO is reduced in the prior art x Emissions, NO can be frequently carried out x The desorption is reduced, so that the PM emission of the engine can be obviously increased until exceeding the standard.
Based on the above findings, it is known that by reducing NO x The execution frequency of desorption reduction can effectively control the PM emission, and therefore, the embodiment of the application provides a control method for controlling the PM emission not to exceed the standard.
As shown in fig. 5, a flow chart of a control method according to an embodiment of the present application includes the following steps.
S501: and determining a target LNT designated temperature corresponding to the current environmental parameter of the vehicle based on the corresponding relation between the environmental parameter and the LNT designated temperature.
Wherein the LNT specified temperature is used to characterize the LNT bed temperature that enables the desorption reduction efficiency of the nitrogen oxides of the LNT to be greater than the calibrated value, the LNT bed temperature represents the temperature of the catalytic bed of the LNT (i.e., the carrier of the LNT), and specifically, referring to fig. 4, assuming the calibrated value is 90%, NO is used x The LNT bed temperature (300 ℃) corresponding to the maximum desorption reduction efficiency (92%) is taken as the LNT designated temperature, and correspondingly, NO under different environmental parameters is measured x And desorbing the LNT bed temperature corresponding to the maximum reduction efficiency so as to obtain the corresponding relation between the environment parameter and the LNT designated temperature.
In some examples, the current environmental parameters shown in the embodiments of the present application may be acquired based on preset sensors, and in addition, the environmental parameters include, but are not limited to, environmental pressure and environmental temperature, and further, the correspondence between the environmental parameters and the LNT specified temperature may be shown in table 1.
TABLE 1
In Table 1 above, X represents ambient pressure (kPa), Y represents ambient temperature (. Degree. C.) and Z represents LNT specified temperature (. Degree. C.).
S502: the vehicle is controlled to execute the target function based on the target LNT specified temperature such that the execution frequency of the target function is less than the specified frequency.
The target function triggers the desorption and reduction of nitrogen oxides in the LNT by controlling the combustion parameters of the engine. In the embodiment of the application, the execution frequency is positively correlated with the particulate matter emission amount of the engine, that is, the higher the execution frequency, the higher the particulate matter emission amount of the engine.
It will be appreciated that controlling the vehicle to perform the target function based on the target LNT specified temperature such that the target function is performed less frequently than the specified frequency effectively reduces NO x The execution frequency of desorption reduction is reduced, and the times of placing the engine in a rich condition are reduced, so that the times of insufficient combustion of the engine are reduced, and the PM emission of the engine is effectively reduced.
It should be noted that, based on the target LNT specified temperature, the vehicle is controlled to execute the target function, which essentially uses the target LNT specified temperature as an activation basis of the target function, so as to control the execution frequency of the target function, and avoid that the execution frequency of the target function is greater than or equal to the specified frequency.
Specifically, assuming that it is originally required to determine that the current LNT bed temperature of the vehicle is greater than or equal to 200 ℃, the vehicle is controlled to execute the target function, and accordingly, the execution frequency of the target function is 10 times/min, and the target LNT specified temperature is determined to be 300 ℃ based on the corresponding relationship between the environmental parameter and the LNT specified temperature.
Alternatively, the specific implementation of the control vehicle to perform the target function based on the target LNT specified temperature may be referred to as steps and an explanation of the steps shown in fig. 6.
The process shown in S501-S502 above controls the vehicle to execute the target function based on the target LNT specified temperature so that the execution frequency of the target function is smaller than the specified frequency, so that the number of times of insufficient combustion of the engine is reduced, thereby effectively reducing the PM emission of the engine and avoiding exceeding the PM emission.
As shown in fig. 6, a flowchart of another control method according to an embodiment of the present application includes the following steps.
S601: the current LNT bed temperature of the vehicle is obtained.
The current LNT bed temperature can be acquired by a temperature sensor preset on a catalytic bed of the LNT.
S602: and judging whether the current LNT bed temperature is greater than or equal to the target LNT specified temperature.
If the current LNT bed temperature is greater than or equal to the target LNT specified temperature, S603 is executed, otherwise S605 is executed.
Alternatively, if the current LNT bed temperature is greater than or equal to the target LNT specified temperature, the vehicle may be directly controlled to perform the target function such that the frequency of performance of the target function is less than the specified frequency.
S603: operating parameters of the vehicle are obtained.
The operating parameters of the vehicle include, but are not limited to: the amount of nitrogen oxide adsorbed by the LNT, and the operating load of the engine. Generally, the operating parameters of the vehicle may be acquired by sensors preset on the vehicle.
The amount of nitrogen oxide adsorbed by the LNT specifically refers to the mass of nitrogen oxide adsorbed by the catalytic bed of the LNT.
S604: the vehicle is controlled to perform a target function based on an operating parameter of the vehicle.
Wherein the control of the vehicle to perform the target function based on the operating parameters of the vehicle ensures that other matters of the vehicle are not affected while ensuring that the PM emission is not out of specification, such as ensuring NO of the vehicle x Emissions are not out of standard, vehicle dynamic performance is not weakened, and the like.
Alternatively, the vehicle may be controlled to perform the target function based on the nox adsorption amount of the LNT such that the nox adsorption efficiency of the LNT is greater than the designated efficiency.
In some examples, the NOx adsorption efficiency is inversely related to the NOx emissions of the vehicle, and by controlling the NOx adsorption efficiency of the LNT to be greater than a specified efficiency, it is possible to ensure that the PM emissions are not exceeded while at the same time ensuring that the NO x The emission is not out of standard, so that the tail gas treatment effect of the vehicle is effectively improved.
In the embodiment of the application, based on the nitrogen oxide adsorption amount of the LNT, the specific implementation process for controlling the vehicle to execute the target function can be as follows: determining a target nitrogen oxide storage ratio based on the nitrogen oxide adsorption amount of the LNT, wherein the target nitrogen oxide storage ratio includes a ratio of the nitrogen oxide adsorption amount to a specified nitrogen oxide adsorbable amount of the LNT; if the target NOx storage ratio is greater than or equal to the specified ratio, the vehicle is controlled to perform the target function.
It will be appreciated that the specific nox adsorbable amount of the LNT may be generally determined based on product specification information for the LNT, and the specific ratio may be set by a technician based on the actual conditions of the LNT.
Specifically, assuming that the predetermined ratio is 0.75, the target nox storage ratio is 0.75, the nox adsorption amount is 1.5L, and as is apparent from fig. 3, the nox adsorption efficiency of the LNT is 20%. In order to ensure that the nox adsorption efficiency of the LNT is greater than 80%, when the predetermined ratio is 0.55, the nox adsorption amount corresponding to the target nox storage ratio is 0.55L, and as can be seen from fig. 3, the nox adsorption efficiency of the LNT is 90%.
In practical application, the control vehicle executes the target function, and the working condition of the engine is changed, so that the power performance of the vehicle is affected, and the driving experience of a user is affected.
Alternatively, the vehicle may be controlled to execute the target function based on the operation load of the engine, so that the power performance of the vehicle is not affected by the target function, and the driving experience of the user is improved.
In some examples, sudden decreases in the power performance of the vehicle may affect the driving experience of the user, sudden increases in the power performance may also affect the driving experience of the user, and for this reason, it is necessary to ensure that the power performance of the vehicle is balanced and not suddenly changed by the influence of the target function.
Optionally, based on the running load of the engine, the specific implementation process for controlling the vehicle to execute the target function includes: obtaining an operating speed of the engine and a target NOx storage ratio; determining a target engine designated first load corresponding to the operating speed and corresponding to the target nitrogen oxide storage ratio based on a correspondence of the engine speed, the nitrogen oxide storage ratio, and the engine designated first load; and if the operating load is greater than or equal to the target engine specified first load, controlling the vehicle to execute the target function.
It is appreciated that the target NOx storage ratio may be determined based on the NOx adsorption amount of the LNT.
Obviously, if the running load is greater than or equal to the first load appointed by the target engine, the vehicle is controlled to execute the target function, so that the power performance of the vehicle can be ensured not to be suddenly weakened due to the influence of the target function, and the driving experience of a user is improved.
In some examples, the correspondence of engine speed, nox storage ratio, and engine specified first load may be specifically found as shown in table 2.
TABLE 2
In the above table 2, X represents the engine speed (rpm), Y represents the nitrogen oxide storage ratio (%), and Z represents the engine specified first load (kPa). Generally, the engine specified first load can be simply understood as: the running load can be reduced without the power performance of the vehicle being affected by the target function.
Optionally, based on the running load of the engine, the specific implementation process for controlling the vehicle to execute the target function includes: obtaining an operating speed of the engine and a target NOx storage ratio; determining a target engine designated second load corresponding to the running speed based on a correspondence between the engine speed and the engine designated second load; and if the operating load is less than or equal to the target engine designated second load, controlling the vehicle to execute the target function.
Obviously, if the running load is smaller than or equal to the second load appointed by the target engine, and the vehicle is controlled to execute the target function, the power performance of the vehicle can be ensured not to be suddenly enhanced due to the influence of the target function, so that the driving experience of a user is improved.
In some examples, the correspondence between engine speed and engine specified second load may be found specifically in table 3.
TABLE 3 Table 3
In the above table 3, X represents the engine speed (rpm), and Z represents the engine specified second load (kPa). Generally, the engine specified second load can be simply understood as: the power performance of the vehicle can be made to be enhanced without being affected by the target function.
S605: the vehicle is prohibited from executing the target function.
The flow shown in S601-S605 above is based on the target LNT specified temperature and the vehicleAs a control basis for the target function of the vehicle, can ensure that the PM emission amount does not exceed the standard and that NO x And when the emission amount is not out of standard, the power performance of the vehicle is ensured not to be influenced by the target function, and the driving experience of a user is effectively improved.
As shown in fig. 7, a logic diagram of a control method according to an embodiment of the present application is shown in fig. 7, and it can be seen that, when the control vehicle executes the target function (i.e., the DeNO shown in fig. 7 x ) In the process of (2), the input signals to be obtained are: LNT bed temperature, ambient pressure, NO x The storage ratio (i.e., the target nox storage ratio), the operating load of the engine (i.e., the engine load in fig. 7), the operating speed of the engine (i.e., the engine speed in fig. 7). Based on the respective input signals, the explanation of the steps shown in S601 to S605 described above is implemented, and specifically, the activation conditions for controlling the vehicle to execute the target function can be generalized as follows: the LNT bed temperature is greater than or equal to the target LNT specified temperature (i.e., allowed to enter DeNO as shown in FIG. 7) x LNT bed temperature map), NO x The storage ratio is greater than or equal to a specified ratio (specifically 0.55), and the operating load of the engine is greater than or equal to a target engine specified first load (i.e., allowed to enter DeNO as shown in fig. 7 x Engine minimum load map) and the operating load of the engine is less than or equal to the target engine specified second load (i.e., allowed to enter DeNO as shown in fig. 7 x Engine maximum load cut).
Based on the activation condition of the vehicle execution target function shown in fig. 7, it is possible to ensure that the PM emission amount does not exceed the standard and NO x And when the emission amount is not out of standard, the power performance of the vehicle is ensured not to be influenced by the target function, and the driving experience of a user is effectively improved.
Corresponding to the control method provided by the application, the embodiment of the application also provides a control device.
Fig. 8 is a schematic diagram of an architecture of a control device according to an embodiment of the present application, including the following units.
A parameter determining unit 100, configured to determine a target LNT specified temperature corresponding to a current environmental parameter of the vehicle based on a correspondence between the environmental parameter and the LNT specified temperature; the LNT designated temperature is used for representing the LNT bed temperature which can enable the desorption and reduction efficiency of nitrogen oxides of the LNT to be larger than a calibration value; the LNT bed temperature represents the temperature of the catalytic bed of the LNT.
A function execution unit 200 for controlling the vehicle to execute the target function such that the execution frequency of the target function is less than the specified frequency, based on the target LNT specified temperature; the target function triggers the desorption and reduction of nitrogen oxides in the LNT by controlling the combustion parameters of the engine; the execution frequency is positively correlated with the particulate matter emission of the engine.
Optionally, the function execution unit 200 is specifically configured to: obtaining a current LNT bed temperature of the vehicle; and if the current LNT bed temperature is greater than or equal to the target LNT specified temperature, controlling the vehicle to execute the target function.
The function execution unit 200 specifically functions to: if the current LNT bed temperature is greater than or equal to the target LNT specified temperature, acquiring the running parameters of the vehicle; the vehicle is controlled to perform a target function based on an operating parameter of the vehicle.
Optionally, the operating parameters of the vehicle include an amount of nox adsorbed by the LNT, and an operating load of the engine.
The function execution unit 200 specifically functions to: based on the nitrogen oxide adsorption quantity of the LNT, controlling the vehicle to execute a target function so that the nitrogen oxide adsorption efficiency of the LNT is greater than the designated efficiency; the nitrogen oxide adsorption efficiency is inversely related to the nitrogen oxide discharge amount of the vehicle.
The function execution unit 200 specifically functions to: determining a target nox storage ratio based on the nox adsorption amount of the LNT; the target NOx storage ratio includes a ratio of the NOx adsorbed amount to a specified NOx adsorbable amount of the LNT; if the target NOx storage ratio is greater than or equal to the specified ratio, the vehicle is controlled to perform the target function.
The function execution unit 200 specifically functions to: the vehicle is controlled to perform a target function based on an operating load of the engine so that power performance of the vehicle is not affected by the target function.
The function execution unit 200 specifically functions to: obtaining an operating speed of the engine and a target NOx storage ratio; determining a target engine designated first load corresponding to the operating speed and corresponding to the target nitrogen oxide storage ratio based on a correspondence of the engine speed, the nitrogen oxide storage ratio, and the engine designated first load; and if the operating load is greater than or equal to the target engine specified first load, controlling the vehicle to execute the target function.
The function execution unit 200 specifically functions to: obtaining an operating speed of the engine and a target NOx storage ratio; determining a target engine designated second load corresponding to the running speed based on a correspondence between the engine speed and the engine designated second load; and if the operating load is less than or equal to the target engine designated second load, controlling the vehicle to execute the target function.
Each unit controls the vehicle to execute the target function based on the target LNT designated temperature, so that the execution frequency of the target function is smaller than the designated frequency, and the number of insufficient combustion times of the engine is reduced, thereby effectively reducing the PM emission of the engine and avoiding exceeding the standard PM emission.
The present application also provides a computer-readable storage medium including a stored program, wherein the program executes the control method provided by the present application.
The application also provides a vehicle comprising: a processor, a memory, and a bus. The processor is connected with the memory through a bus, the memory is used for storing a program, and the processor is used for running the program, wherein the control method provided by the application is executed when the program runs.
Furthermore, the functions described above in embodiments of the application may be performed, at least in part, by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), an Application Specific Standard Product (ASSP), a system on a chip (SOC), a Complex Programmable Logic Device (CPLD), and the like.
Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are example forms of implementing the claims.
While several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the application. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the disclosure referred to in the present application is not limited to the specific combinations of technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the spirit of the disclosure. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.
Claims (10)
1. A control method, characterized by comprising:
determining a target LNT specified temperature corresponding to the current environmental parameter of the vehicle based on the corresponding relation between the environmental parameter and the LNT specified temperature; the LNT specified temperature is used for representing the LNT bed temperature which can enable the nitrogen oxide desorption reduction efficiency of the LNT to be larger than a standard value; the LNT bed temperature represents a temperature of a catalytic bed of the LNT;
controlling the vehicle to execute a target function based on the target LNT specified temperature so that the execution frequency of the target function is less than a specified frequency; the target function triggers the desorption and reduction of nitrogen oxides in the LNT by controlling the combustion parameters of the engine; the execution frequency is positively correlated with the particulate matter emission of the engine.
2. The method of claim 1, wherein controlling the vehicle to perform a target function based on the target LNT specified temperature comprises:
obtaining a current LNT bed temperature of the vehicle;
and if the current LNT bed temperature is greater than or equal to the target LNT specified temperature, controlling the vehicle to execute a target function.
3. The method of claim 2, wherein controlling the vehicle to perform a target function if the current LNT bed temperature is greater than or equal to the target LNT specified temperature comprises:
if the current LNT bed temperature is greater than or equal to the target LNT specified temperature, acquiring the running parameters of the vehicle;
and controlling the vehicle to execute a target function based on the operation parameters of the vehicle.
4. The method of claim 3, wherein the operating parameter comprises an amount of nox adsorbed by the LNT;
controlling the vehicle to perform a target function based on an operating parameter of the vehicle, comprising:
controlling the vehicle to execute a target function based on the nitrogen oxide adsorption amount of the LNT so that the nitrogen oxide adsorption efficiency of the LNT is greater than a specified efficiency; the nitrogen oxide adsorption efficiency is inversely related to a nitrogen oxide discharge amount of the vehicle.
5. The method of claim 4, wherein controlling the vehicle to perform a target function based on the nox adsorption amount of the LNT comprises:
determining a target nox storage ratio based on the nox adsorption amount of the LNT; the target nox storage ratio includes a ratio of the nox adsorption amount to a specified nox adsorbable amount of the LNT;
and if the target NOx storage ratio is greater than or equal to a specified ratio, controlling the vehicle to execute a target function.
6. A method according to claim 3, wherein the operating parameter comprises an operating load of the engine;
controlling the vehicle to perform a target function based on an operating parameter of the vehicle, comprising:
the vehicle is controlled to execute a target function based on an operating load of the engine so that a power performance of the vehicle is not affected by the target function.
7. The method of claim 6, wherein controlling the vehicle to perform a target function based on an operating load of the engine comprises:
obtaining an operating speed of the engine and a target nitrogen oxide storage ratio;
determining a target engine designated first load corresponding to the operating speed and corresponding to the target nitrogen oxide storage ratio based on a correspondence of the engine speed, the nitrogen oxide storage ratio, and the engine designated first load;
and if the running load is greater than or equal to the first specified load of the target engine, controlling the vehicle to execute a target function.
8. The method of claim 6, wherein controlling the vehicle to perform a target function based on an operating load of the engine comprises:
obtaining an operating speed of the engine and the target nox storage ratio;
determining a target engine designated second load corresponding to the running speed based on a corresponding relation between the engine speed and the engine designated second load;
and if the running load is less than or equal to the second load appointed by the target engine, controlling the vehicle to execute a target function.
9. A control apparatus, characterized by comprising:
the parameter determining unit is used for determining a target LNT specified temperature corresponding to the current environmental parameter of the vehicle based on the corresponding relation between the environmental parameter and the LNT specified temperature; the LNT specified temperature is used for representing the LNT bed temperature which can enable the nitrogen oxide desorption reduction efficiency of the LNT to be larger than a standard value; the LNT bed temperature represents a temperature of a catalytic bed of the LNT;
a function execution unit configured to control the vehicle to execute a target function based on the target LNT specified temperature so that an execution frequency of the target function is smaller than a specified frequency; the target function triggers the desorption and reduction of nitrogen oxides in the LNT by controlling the combustion parameters of the engine; the execution frequency is positively correlated with the particulate matter emission of the engine.
10. A vehicle, characterized by comprising: a processor, a memory, and a bus; the processor is connected with the memory through the bus;
the memory is used for storing a program and the processor is used for running the program, wherein the program is executed by the processor to perform the control method according to any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310794106.2A CN116658280A (en) | 2023-06-30 | 2023-06-30 | Control method and device and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310794106.2A CN116658280A (en) | 2023-06-30 | 2023-06-30 | Control method and device and vehicle |
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| Publication Number | Publication Date |
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| CN116658280A true CN116658280A (en) | 2023-08-29 |
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| CN202310794106.2A Pending CN116658280A (en) | 2023-06-30 | 2023-06-30 | Control method and device and vehicle |
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| CN (1) | CN116658280A (en) |
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2023
- 2023-06-30 CN CN202310794106.2A patent/CN116658280A/en active Pending
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