Control method, device and vehicle

Abstract

This application discloses a control method, device, and vehicle. The method involves: determining the target LNT (Limited Temperature Tolerance) temperature corresponding to the vehicle's current environmental parameters based on the correspondence between environmental parameters and LNT temperature; and controlling the vehicle to execute a target function based on the target LNT temperature, such that the execution frequency of the target function is less than the specified frequency. This method can reduce the number of incomplete combustion events in the engine, thereby effectively reducing PM emissions and preventing PM emissions from exceeding standards.

Description

Technical Field

[0001] This application relates to the field of automotive exhaust treatment, and more particularly to a control method, device, and vehicle. Background Technology

[0002] Existing light-duty diesel vehicles generally employ an after-treatment technology route of LNT+CDPF+SCR to treat exhaust gases. For details on this exhaust gas treatment method, please refer to [link to relevant documentation]. Figure 1 As shown. The so-called diesel engine exhaust aftertreatment (Lean-bum NO) x A nitrogen oxide trap (LNT), also known as a nitrogen oxide filter, works by using rare metals to adsorb nitrogen oxides (NOx) from vehicle exhaust. x And by controlling engine combustion parameters, a reducing agent is generated in the exhaust passage to utilize the reducing agent to remove NO from LNT. x Desorption and reduction are used to effectively treat vehicle exhaust gases. Specifically, the working principle of LNT is as follows: Figure 2 As shown.

[0003] However, the current use of LNT for vehicle exhaust treatment results in excessive emissions of particulate matter (PM), thus reducing the effectiveness of vehicle exhaust treatment. Summary of the Invention

[0004] This application provides a control method, device, and vehicle for controlling PM emissions to keep them within limits.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A control method, comprising:

[0007] Based on the correspondence between environmental parameters and LNT specified temperatures, the target LNT specified temperature corresponding to the vehicle's current environmental parameters is determined; the LNT specified temperature is used to characterize the LNT bed temperature that enables the nitrogen oxide desorption and reduction efficiency of the LNT to be greater than the calibrated value; the LNT bed temperature represents the temperature of the LNT's catalyst bed.

[0008] Based on the specified temperature of the target LNT, the vehicle is controlled to perform a target function so 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 engine combustion parameters; the execution frequency is positively correlated with the particulate matter emissions of the engine.

[0009] Optionally, based on the target LNT specified temperature, control the vehicle to perform a target function, including:

[0010] Obtain the current LNT bed temperature of the vehicle;

[0011] If the current LNT bed temperature is greater than or equal to the target LNT specified temperature, control the vehicle to perform the target function.

[0012] Optionally, if the current LNT bed temperature is greater than or equal to the target LNT specified temperature, the vehicle is controlled to perform the target function, including:

[0013] If the current LNT bed temperature is greater than or equal to the target LNT specified temperature, obtain the vehicle's operating parameters;

[0014] Based on the vehicle's operating parameters, the vehicle is controlled to perform the target function.

[0015] Optionally, the operating parameters include the nitrogen oxide adsorption capacity of the LNT;

[0016] Based on the vehicle's operating parameters, control the vehicle to perform a target function, including:

[0017] Based on the nitrogen oxide adsorption capacity of the LNT, the vehicle is controlled to perform a target function so that the nitrogen oxide adsorption efficiency of the LNT is greater than a specified efficiency; the nitrogen oxide adsorption efficiency is negatively correlated with the nitrogen oxide emissions of the vehicle.

[0018] Optionally, based on the nitrogen oxide adsorption capacity of the LNT, the vehicle is controlled to perform a target function, including:

[0019] Based on the nitrogen oxide adsorption capacity of the LNT, a target nitrogen oxide storage ratio is determined; the target nitrogen oxide storage ratio includes the ratio of the nitrogen oxide adsorption capacity to the specified nitrogen oxide adsorption capacity of the LNT.

[0020] If the target nitrogen oxide storage ratio is greater than or equal to the specified ratio, control the vehicle to perform the target function.

[0021] Optionally, the operating parameters include the engine's operating load;

[0022] Based on the vehicle's operating parameters, control the vehicle to perform a target function, including:

[0023] Based on the engine's operating load, the vehicle is controlled to perform a target function so that the vehicle's power performance is not affected by the target function.

[0024] Optionally, based on the engine's operating load, the vehicle is controlled to perform a target function, including:

[0025] The operating speed of the engine and the target nitrogen oxide storage ratio are obtained;

[0026] Based on the correspondence between engine speed, NOx storage ratio, and engine designated first load, the target engine designated first load corresponding to the operating speed and the target NOx storage ratio is determined.

[0027] If the operating load is greater than or equal to the first load specified by the target engine, control the vehicle to perform the target function.

[0028] Optionally, based on the engine's operating load, the vehicle is controlled to perform a target function, including:

[0029] The operating speed of the engine and the target nitrogen oxide storage ratio are obtained;

[0030] Based on the correspondence between engine speed and designated second load of the engine, the target designated second load of the engine corresponding to the operating speed is determined;

[0031] If the operating load is less than or equal to the second load specified by the target engine, control the vehicle to perform the target function.

[0032] A control device, comprising:

[0033] The parameter determination unit is used to determine the target LNT specified temperature corresponding to the current environmental parameters of the vehicle based on the correspondence between environmental parameters and LNT specified temperature; the LNT specified temperature is used to characterize the LNT bed temperature that enables the nitrogen oxide desorption and reduction efficiency of the LNT to be greater than the calibration value; the LNT bed temperature represents the temperature of the catalyst bed of the LNT.

[0034] The function execution unit is used to control the vehicle to execute a target function based on the specified temperature of the target LNT, so 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 engine combustion parameters; the execution frequency is positively correlated with the particulate matter emissions of the engine.

[0035] A vehicle includes: a processor, a memory, and a bus; the processor and the memory are connected via the bus.

[0036] The memory is used to store a program, and the processor is used to run the program, wherein the program is executed by the processor to perform the control method.

[0037] The technical solution provided in this application determines the target LNT specified temperature corresponding to the current environmental parameters of the vehicle based on the correspondence between environmental parameters and LNT specified temperature. Based on the target LNT specified temperature, the vehicle is controlled to perform a target function so that the execution frequency of the target function is less than the specified frequency, thereby reducing the number of times the engine has incomplete combustion, effectively reducing the PM emissions of the engine, and avoiding PM emissions exceeding the standard. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A schematic diagram illustrating an exhaust gas treatment method provided in an embodiment of this application;

[0040] Figure 2 A schematic diagram illustrating the working principle of an LNT provided in an embodiment of this application;

[0041] Figure 3 A NO provided for embodiments of this application x Adsorption efficiency and NO x A schematic diagram illustrating the correlation between adsorption capacity;

[0042] Figure 4 A NO provided for embodiments of this application x A schematic diagram illustrating the relationship between desorption-reduction efficiency and LNT bed temperature;

[0043] Figure 5 A flowchart illustrating a control method provided in an embodiment of this application;

[0044] Figure 6 A flowchart illustrating another control method provided in an embodiment of this application;

[0045] Figure 7 A logical schematic diagram of a control method provided in an embodiment of this application;

[0046] Figure 8 This is a schematic diagram of the architecture of a control device provided in an embodiment of this application. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] Based on practical experience with LNT in vehicle exhaust treatment, the applicant discovered that under lean-burn conditions, the catalytic bed in the LNT can adsorb NO from the exhaust gas. x NO x Once the adsorption capacity exceeds a specified value, the engine combustion parameters need to be adjusted to ensure the engine operates under a rich-fuel condition. The LNT will then process the already adsorbed NO under this rich-fuel condition. x Desorption and reduction are performed on LNT NO. x The adsorption efficiency is significantly affected by NO x The effect of adsorption capacity, specifically, NO x Adsorption efficiency and NO x Adsorption capacity (i.e. NO) x The relationship between storage quantity and other related factors, such as Figure 3 As shown, in addition, LNT's NO x The desorption-reduction efficiency is also significantly affected by the temperature of the LNT catalytic bed (i.e., the LNT bed temperature). Specifically, NO x The relationship between desorption-reduction efficiency and LNT bed temperature, such as Figure 4 As shown, further, due to the NO of LNT x The desorption and reduction process takes place under fuel-rich conditions, where engine combustion is poor (usually due to incomplete combustion). Existing technologies aim to reduce NO... x Emissions will be frequently monitored for NO. x Desorption and reduction can lead to a significant increase in PM emissions from the engine, potentially exceeding safety limits.

[0049] Based on the applicant's findings above, it is known that by reducing NO... x The frequency of desorption and reduction can effectively control PM emissions. Therefore, this application provides a control method to control PM emissions from exceeding the standard.

[0050] like Figure 5 The diagram shown is a flowchart of a control method provided in an embodiment of this application, including the following steps.

[0051] S501: Based on the correspondence between environmental parameters and LNT specified temperature, determine the target LNT specified temperature corresponding to the vehicle's current environmental parameters.

[0052] The LNT specified temperature is used to characterize the LNT bed temperature that enables the nitrogen oxide desorption and reduction efficiency of LNT to exceed the calibrated value. The LNT bed temperature represents the temperature of the LNT catalyst bed (i.e., the LNT support). For details, see [link to relevant documentation]. Figure 4 As shown, assuming the calibration value is 90%, using NO x The LNT bed temperature (300℃) corresponding to the maximum desorption-reduction efficiency (i.e., 92%) is used as the designated temperature for LNT. Correspondingly, NO is measured under different environmental parameters. x The LNT bed temperature corresponding to the maximum desorption-reduction efficiency is used to obtain the correspondence between environmental parameters and specified LNT temperatures.

[0053] In some examples, the current environmental parameters shown in the embodiments of this application can be obtained based on preset sensors. In addition, the environmental parameters include, but are not limited to, environmental pressure and environmental temperature. Furthermore, the correspondence between the environmental parameters and the LNT-specified temperature can be found in Table 1.

[0054] Table 1

[0055]

[0056] In Table 1 above, X represents ambient pressure (kPa), Y represents ambient temperature (°C), and Z represents the LNT specified temperature (°C).

[0057] S502: Based on the target LNT specified temperature, control the vehicle to perform the target function so that the execution frequency of the target function is less than the specified frequency.

[0058] The target function triggers the desorption and reduction of nitrogen oxides in the LNT by controlling engine combustion parameters. In this embodiment, the execution frequency is positively correlated with the engine's particulate matter emissions; that is, the higher the execution frequency, the higher the engine's particulate matter emissions.

[0059] Understandably, controlling the vehicle to perform target functions based on the target LNT (Lower Tendency Tolerance) temperature, so that the frequency of execution of the target functions is lower than the specified frequency, can effectively reduce NO. x The frequency of desorption and reduction is reduced, thus reducing the number of times the engine is subjected to rich combustion conditions, thereby reducing the number of times the engine experiences incomplete combustion and effectively reducing the engine's PM emissions.

[0060] It should be noted that controlling the vehicle to execute a target function based on the specified temperature of the target LNT essentially means using the specified temperature of the target LNT as the activation basis for the target function, in order to control the execution frequency of the target function and prevent the execution frequency of the target function from being greater than or equal to the specified frequency.

[0061] Specifically, assuming that the vehicle's current LNT bed temperature is originally required to be greater than or equal to 200°C before executing the target function, and the execution frequency of the target function is 10 times / min, based on the correspondence between environmental parameters and the specified LNT temperature, the target LNT specified temperature is determined to be 300°C. Therefore, the vehicle's current LNT bed temperature is only required to execute the target function when it is greater than or equal to 300°C, and the execution frequency of the target function is 6 times / min. Obviously, based on the positive correlation between execution frequency and engine particulate matter emissions, it can be seen that controlling the vehicle to execute the target function based on the target LNT specified temperature can reduce particulate matter emissions.

[0062] Optionally, the specific implementation process of controlling the vehicle to perform the target function based on the target LNT specified temperature can be found in [reference needed]. Figure 6 The steps shown are explained.

[0063] The processes shown in S501-S502 above control the vehicle to perform target functions based on the target LNT specified temperature, so that the execution frequency of the target functions is less than the specified frequency, thereby reducing the number of times the engine has incomplete combustion, effectively reducing the engine's PM emissions and avoiding exceeding the PM emission standard.

[0064] like Figure 6 The diagram shown is a flowchart of another control method provided in an embodiment of this application, which includes the following steps.

[0065] S601: Obtain the current LNT bed temperature of the vehicle.

[0066] The current LNT bed temperature can be obtained by a temperature sensor pre-installed on the LNT catalyst bed.

[0067] S602: Determine whether the current LNT bed temperature is greater than or equal to the target LNT specified temperature.

[0068] If the current LNT bed temperature is greater than or equal to the target LNT specified temperature, then execute S603; otherwise, execute S605.

[0069] Optionally, if the current LNT bed temperature is greater than or equal to the target LNT specified temperature, the vehicle can be directly controlled to perform the target function so that the execution frequency of the target function is less than the specified frequency.

[0070] S603: Obtain the vehicle's operating parameters.

[0071] The vehicle's operating parameters include, but are not limited to, the amount of nitrogen oxides adsorbed by LNTs and the engine's operating load. Generally, these operating parameters can be collected by sensors pre-installed on the vehicle.

[0072] It should be noted that the so-called nitrogen oxide adsorption capacity of LNT specifically refers to the mass of nitrogen oxides adsorbed by the LNT catalytic bed.

[0073] S604: Controls the vehicle to perform target functions based on the vehicle's operating parameters.

[0074] Based on the vehicle's operating parameters, controlling the vehicle to perform target functions can ensure that PM emissions do not exceed standards while ensuring that other aspects of the vehicle are not affected, such as ensuring the vehicle's NO emissions. x Emissions will not exceed standards, and vehicle power performance will not be weakened.

[0075] Optionally, the vehicle can be controlled to perform a target function based on the nitrogen oxide adsorption capacity of the LNT, so that the nitrogen oxide adsorption efficiency of the LNT is greater than a specified efficiency.

[0076] In some examples, nitrogen oxide adsorption efficiency is negatively correlated with vehicle nitrogen oxide emissions. By controlling the nitrogen oxide adsorption efficiency of the LNT to be greater than a specified efficiency, it is possible to ensure that PM emissions do not exceed the standard while also ensuring NO emissions are within acceptable limits. x Emissions are kept within limits, which effectively improves the vehicle's exhaust gas treatment efficiency.

[0077] In this embodiment of the application, the specific implementation process of controlling the vehicle to perform the target function based on the nitrogen oxide adsorption amount of LNT can be as follows: based on the nitrogen oxide adsorption amount of LNT, a target nitrogen oxide storage ratio is determined, wherein the target nitrogen oxide storage ratio includes the ratio of nitrogen oxide adsorption amount to the specified nitrogen oxide adsorption amount of LNT; if the target nitrogen oxide storage ratio is greater than or equal to the specified ratio, the vehicle is controlled to perform the target function.

[0078] Understandably, the specified nitrogen oxide adsorption capacity of LNT is usually determined based on the LNT's product specifications, and the specified ratio can be set by technicians according to the actual situation of the LNT.

[0079] Specifically, assuming the specified ratio is set to 0.75, then when the target nitrogen oxide storage ratio is 0.75, the corresponding nitrogen oxide adsorption capacity is 1.5L. Figure 3 It is known that the nitrogen oxide adsorption efficiency of LNT is 20%. To ensure that the nitrogen oxide adsorption efficiency of LNT is greater than 80%, the specified ratio is set to 0.55. Therefore, when the target nitrogen oxide storage ratio is 0.55, the corresponding nitrogen oxide adsorption capacity is 0.3 L. Figure 3 It can be seen that the nitrogen oxide adsorption efficiency of LNT is 90%.

[0080] In practical applications, controlling a vehicle to perform a target function will change the engine's operating conditions, which will affect the vehicle's power performance and thus the user's driving experience.

[0081] Optionally, the vehicle can be controlled to perform a target function based on the engine's operating load, so that the vehicle's power performance is not affected by the target function, thereby improving the user's driving experience.

[0082] In some cases, a sudden decrease in vehicle power performance can affect the user's driving experience, and a sudden increase in power performance can also affect the user's driving experience. Therefore, it is necessary to ensure that the vehicle's power performance is balanced and does not change abruptly due to the target function.

[0083] Optionally, the specific implementation process of controlling the vehicle to perform the target function based on the engine's operating load includes: obtaining the engine's operating speed and the target NOx storage ratio; determining the target engine-specified first load corresponding to the operating speed and the target NOx storage ratio based on the correspondence between the engine speed, the NOx storage ratio and the engine-specified first load; and controlling the vehicle to perform the target function if the operating load is greater than or equal to the target engine-specified first load.

[0084] Understandably, the target nitrogen oxide storage ratio can be determined based on the nitrogen oxide adsorption capacity of LNTs.

[0085] Clearly, if the operating load is greater than or equal to the target engine's specified first load, controlling the vehicle to execute the target function can ensure that the vehicle's power performance will not suddenly weaken due to the target function, thereby improving the user's driving experience.

[0086] In some examples, the correspondence between engine speed, NOx storage ratio, and engine specified first load can be found in Table 2.

[0087] Table 2

[0088]

[0089]

[0090] In Table 2 above, X represents engine speed (rpm), Y represents nitrogen oxide storage ratio (%), and Z represents engine specified first load (kPa). Generally speaking, engine specified first load can be simply understood as: the operating load that can prevent the vehicle's power performance from being weakened by the target function.

[0091] Optionally, the specific implementation process of controlling the vehicle to perform the target function based on the engine's operating load includes: obtaining the engine's operating speed and the target nitrogen oxide storage ratio; determining the target engine-specified second load corresponding to the operating speed based on the correspondence between the engine speed and the engine-specified second load; and controlling the vehicle to perform the target function if the operating load is less than or equal to the target engine-specified second load.

[0092] Clearly, if the operating load is less than or equal to the target engine's specified second load, controlling the vehicle to perform the target function can ensure that the vehicle's power performance will not be suddenly enhanced due to the target function, thereby improving the user's driving experience.

[0093] In some examples, the correspondence between engine speed and the specified second load on the engine can be found in Table 3.

[0094] Table 3

[0095]

[0096]

[0097] In Table 3 above, X represents engine speed (rpm), and Z represents the engine's designated second load (kPa). Generally speaking, the engine's designated second load can be simply understood as: the operating load that enhances the vehicle's power performance without affecting the target function.

[0098] S605: Prohibit the vehicle from performing the target function.

[0099] The processes described in S601-S605 above, based on the target LNT specified temperature and the vehicle's operating parameters, serve as the control basis for the vehicle to perform the target function, ensuring that PM emissions do not exceed the standard and NO emissions are within acceptable limits. x While ensuring emissions do not exceed standards, the vehicle's power performance is not affected by the target function, effectively improving the user's driving experience.

[0100] like Figure 7 The diagram shown is a logical schematic of a control method provided in an embodiment of this application, based on... Figure 7 As shown, the content indicates that the vehicle is controlled to perform the target function (i.e. Figure 7 The DeNO shown x During the process, the required input signals are: LNT bed temperature, ambient temperature, ambient pressure, and NO. x Storage ratio (i.e., target nitrogen oxide storage ratio), engine operating load (i.e. Figure 7 Engine load), engine operating speed (i.e. Figure 7The engine speed in the middle). Based on the various input signals, the explanation of the steps shown in S601-S605 above is as follows: Specifically, the activation condition for controlling the vehicle to perform the target function can be summarized as: the LNT bed temperature is greater than or equal to the target LNT specified temperature (i.e., Figure 7 The shown allows entry into DeNO x LNT bed temperature map), NO x The storage ratio is greater than or equal to the specified ratio (specifically 0.55), and the engine's operating load is greater than or equal to the target engine's specified first load (i.e., Figure 7 The shown allows entry into DeNO x Engine minimum load map), the engine's operating load is less than or equal to the target engine's specified second load (i.e., Figure 7 The shown allows entry into DeNO x (Engine maximum load curve).

[0101] based on Figure 7 The activation conditions shown for the vehicle to perform the target function are such that PM emissions are kept within limits and NO emissions are within limits. x While ensuring emissions do not exceed standards, the vehicle's power performance is not affected by the target function, effectively improving the user's driving experience.

[0102] Corresponding to the control method provided in this application, the embodiments of this application also provide a control device.

[0103] like Figure 8 The diagram shown is a schematic representation of the architecture of a control device provided in an embodiment of this application, including the following units.

[0104] The parameter determination unit 100 is used to determine the target LNT specified temperature corresponding to the current environmental parameters of the vehicle based on the correspondence between environmental parameters and LNT specified temperature; the LNT specified temperature is used to characterize the LNT bed temperature that enables the nitrogen oxide desorption and reduction efficiency of LNT to be greater than the calibration value; the LNT bed temperature represents the temperature of the LNT catalyst bed.

[0105] The function execution unit 200 is used to control the vehicle to execute a target function based on the specified temperature of the target LNT, so 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 engine combustion parameters; the execution frequency is positively correlated with the particulate matter emissions of the engine.

[0106] Optionally, the function execution unit 200 is specifically used to: obtain the current LNT bed temperature of the vehicle; if the current LNT bed temperature is greater than or equal to the target LNT specified temperature, control the vehicle to execute the target function.

[0107] The function execution unit 200 is specifically used to: obtain the vehicle's operating parameters if the current LNT bed temperature is greater than or equal to the target LNT specified temperature; and control the vehicle to execute the target function based on the vehicle's operating parameters.

[0108] Optionally, vehicle operating parameters include the nitrogen oxide adsorption capacity of LNTs and the engine operating load.

[0109] The function execution unit 200 is specifically used to: control the vehicle to perform a target function based on the nitrogen oxide adsorption amount of LNT, so that the nitrogen oxide adsorption efficiency of LNT is greater than a specified efficiency; the nitrogen oxide adsorption efficiency is negatively correlated with the nitrogen oxide emissions of the vehicle.

[0110] The function execution unit 200 is specifically used to: determine the target nitrogen oxide storage ratio based on the nitrogen oxide adsorption amount of LNT; the target nitrogen oxide storage ratio includes the ratio of nitrogen oxide adsorption amount to the specified nitrogen oxide adsorption amount of LNT; if the target nitrogen oxide storage ratio is greater than or equal to the specified ratio, control the vehicle to execute the target function.

[0111] The function execution unit 200 is specifically used to: control the vehicle to perform a target function based on the engine's operating load, so that the vehicle's power performance is not affected by the target function.

[0112] The function execution unit 200 is specifically used to: obtain the engine's operating speed and the target NOx storage ratio; determine the target engine specified first load corresponding to the operating speed and the target NOx storage ratio based on the correspondence between the engine speed, the NOx storage ratio and the engine specified first load; and control the vehicle to execute the target function if the operating load is greater than or equal to the target engine specified first load.

[0113] The function execution unit 200 is specifically used to: obtain the engine's operating speed and the target nitrogen oxide storage ratio; determine the target engine-specified second load corresponding to the operating speed based on the correspondence between the engine speed and the engine-specified second load; and control the vehicle to execute the target function if the operating load is less than or equal to the target engine-specified second load.

[0114] The units described above control the vehicle to perform target functions based on the target LNT specified temperature, so that the execution frequency of the target functions is less than the specified frequency, thereby reducing the number of times the engine has incomplete combustion, effectively reducing the engine's PM emissions and preventing PM emissions from exceeding the standard.

[0115] This application also provides a computer-readable storage medium including a stored program, wherein the program executes the control method provided in this application.

[0116] This application also provides a vehicle, including a processor, a memory, and a bus. The processor and the memory are connected via the bus. The memory is used to store a program, and the processor is used to run the program. During program execution, the control method provided in this application is performed.

[0117] Furthermore, the functions described above in the embodiments of this application can be performed at least in part by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that can be used include: Field Programmable Gate Arrays (FPGAs), Application-Specific Integrated Circuits (ASICs), Application Standard Products (ASSPs), System-on-Chip (SOCs), Complex Programmable Logic Devices (CPLDs), and so on.

[0118] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

[0119] While several specific implementation details are included in the foregoing discussion, these should not be construed as limiting the scope of this application. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.

[0120] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of disclosure in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A vehicle control method characterized by, The method comprises: determining a target LNT specified temperature corresponding to a current environmental parameter of the vehicle based on a correspondence between environmental parameters and LNT specified temperatures; the LNT specified temperature is used to represent an LNT bed temperature capable of making the nitrogen oxide desorption reduction efficiency of the LNT greater than a calibration value; the LNT bed temperature represents the temperature of the catalytic bed of the LNT; controlling the vehicle to perform 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 nitrogen oxide desorption reduction in the LNT by controlling the engine combustion parameter; the execution frequency of the target function is positively correlated with the particulate matter emission of the engine, and as the execution frequency decreases, the execution frequency of the nitrogen oxide desorption reduction also decreases, so that the number of times of insufficient combustion of the engine is reduced.

2. The method of claim 1, wherein, controlling the vehicle to perform a target function based on the target LNT specified temperature, comprising: obtaining a current LNT bed temperature of the vehicle; if the current LNT bed temperature is greater than or equal to the target LNT specified temperature, controlling the vehicle to perform a target function.

3. The method of claim 2, wherein, if the current LNT bed temperature is greater than or equal to the target LNT specified temperature, controlling the vehicle to perform a target function, comprising: if the current LNT bed temperature is greater than or equal to the target LNT specified temperature, obtaining an operating parameter of the vehicle; controlling the vehicle to perform a target function based on the operating parameter of the vehicle.

4. The method of claim 3, wherein, the operating parameter includes the nitrogen oxide adsorption amount of the LNT; controlling the vehicle to perform a target function based on the operating parameter of the vehicle, comprising: controlling the vehicle to perform 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 negatively correlated with the nitrogen oxide emission of the vehicle.

5. The method of claim 4, wherein, controlling the vehicle to perform a target function based on the nitrogen oxide adsorption amount of the LNT, comprising: determining a target nitrogen oxide storage ratio based on the nitrogen oxide adsorption amount of the LNT; the target nitrogen oxide storage ratio includes the ratio of the nitrogen oxide adsorption amount to a specified nitrogen oxide adsorbable amount of the LNT; if the target nitrogen oxide storage ratio is greater than or equal to a specified ratio, controlling the vehicle to perform a target function.

6. The method of claim 3, wherein, the operating parameter includes the operating load of the engine; controlling the vehicle to perform a target function based on the operating parameter of the vehicle, comprising: controlling the vehicle to perform a target function based on the operating load of the engine, so that the 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 the operating load of the engine, comprising: obtaining the operating speed of the engine and a target nitrogen oxide storage ratio; determining a target engine specified first load corresponding to the operating speed and the target nitrogen oxide storage ratio based on a correspondence between engine speeds, nitrogen oxide storage ratios and engine specified first loads; if the operating load is greater than or equal to the target engine specified first load, controlling the vehicle to perform a target function.

8. The method of claim 6, wherein, controlling the vehicle to perform a target function based on the operating load of the engine, including: obtaining an operating speed of the engine, and a target nitrogen oxide storage ratio; determining a target engine specified second load corresponding to the operating speed based on a corresponding relationship between engine speed and engine specified second load; controlling the vehicle to perform a target function if the operating load is less than or equal to the target engine specified second load.

9. A vehicle control device characterized by comprising: including: a parameter determination unit configured to determine a target LNT specified temperature corresponding to a current environmental parameter of the vehicle based on a corresponding relationship between environmental parameters and LNT specified temperatures; the LNT specified temperature is used to represent an LNT bed temperature capable of making the nitrogen oxide desorption reduction efficiency of the LNT greater than a specified value; the LNT bed temperature represents the temperature of the catalytic bed of the LNT; a function execution unit configured to control the vehicle to perform 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 nitrogen oxide desorption reduction in the LNT by controlling the engine combustion parameters; the execution frequency is positively correlated with the particulate matter emission of the engine, and as the execution frequency decreases, the execution frequency of the nitrogen oxide desorption reduction also decreases, so that the number of times of insufficient combustion of the engine is reduced.

10. A vehicle characterized by comprising: including: a processor, a memory and a bus; the processor is connected with the memory through the bus; the memory is used to store a program, and the processor is used to run the program, wherein the program executed by the processor performs the vehicle control method of any one of claims 1-8.

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