A method, system, electronic device and medium for desulfurization of LNT

Abstract

The present invention discloses a method, system, electronic device and medium for desulfurization of LNT, belonging to the technical field of engine exhaust treatment. After detecting that the LNT system enters the desulfurization mode, the method uses real-time collected environmental information and vehicle operating condition information and other data to determine the final post-injection amount value, and sends instructions to inject fuel according to this value to prompt the LNT to perform reduction desulfurization. Compared with the prior art, the desulfurization method provided by the present invention adjusts the amount of fuel injected in the desulfurization mode by collecting real-time environmental data, thereby avoiding the engine being affected by the environment, incomplete desulfurization or excessive temperature during desulfurization, causing LNT system ablation and other problems. The present invention aims at the problem of the influence of environmental factors on LNT desulfurization, and performs more precise calibration of the amount of fuel injected in the desulfurization mode, which is conducive to further exploring the potential of the LNT catalyst and expanding the scope of use of the LNT catalyst system.

Description

Technical Field

[0001] The invention relates to the technical field of engine exhaust treatment, and in particular to a LNT desulfurization method, system, electronic equipment and medium. Background Art

[0002] The lean NOx trap (LNT) is part of the engine exhaust treatment device, which is used to absorb nitrogen oxides NOx in the exhaust gas under certain conditions. When the absorbed NOx reaches the maximum capacity, it is reduced to N2 and O2 under enrichment conditions and discharged. However, the sulfur element contained in the exhaust gas will also be absorbed by the LNT, and react with the storage component Ba in the LNT to form BaSO4. In addition, the stability of sulfate is higher than that of nitrate, and it is more difficult to decompose. Once the LNT absorbs sulfur, it is difficult to react with NOx, resulting in a decrease in the NOx storage capacity of the LNT system or even inactivation. Therefore, it is necessary to change the driving conditions of the engine every once in a while to eliminate the sulfur poisoned by the LNT.

[0003] The commonly used desulfurization method in the prior art is to heat the exhaust gas and adjust the actual air-fuel ratio at the same time. First, the engine ECU calculates the amount of sulfur entering the LNT from the fuel and oil according to the strategy. When the engine ECU detects that the amount of sulfur in the LNT reaches a certain limit, it controls the vehicle to enter the desulfurization mode. Then, during the operation of the vehicle, the engine fuel injection device injects the post-injection fuel, and the post-injection fuel burns to produce high temperature and strong reducing gas. After the reducing gas enters the LNT system under high temperature conditions, an oxidation-reduction reaction occurs, causing BaSO4 to be reduced to Ba0, and the active sites on the carrier can be regenerated and precipitated, thereby completing the desulfurization.

[0004] However, this desulfurization method has disadvantages. After the vehicle enters the desulfurization mode, the amount of post-injection injected by the fuel injection device depends on the current engine speed and power. This method results in a poor desulfurization effect of the LNT. Summary of the invention

[0005] The main purpose of the present invention is to provide a method, system, electronic equipment and medium for desulfurization of LNT, so as to solve the problem that the desulfurization effect of the existing desulfurization method is not ideal under extreme environment.

[0006] The present invention is achieved through the following technical solutions:

[0007] A first aspect of the present invention provides a desulfurization method for LNT, comprising:

[0008] When it is detected that the LNT enters the desulfurization mode, current environmental information and vehicle operating condition information are collected in real time, wherein the environmental information at least includes ambient temperature and atmospheric pressure;

[0009] Determining an environmental correction coefficient according to the environmental information;

[0010] Determining a post-injection fuel quantity basic value under a current operating condition of the vehicle according to the vehicle operating condition information;

[0011] Determining a final post-injection amount value according to the environmental correction coefficient and the post-injection amount base value;

[0012] Fuel injection is performed according to the final post-injection amount value to promote the reduction desulfurization reaction of the LNT.

[0013] Preferably, the vehicle operating condition information includes at least engine speed and engine power.

[0014] Preferably, determining the environmental correction coefficient according to the environmental information comprises:

[0015] In a preset environmental correction data table, an environmental correction coefficient corresponding to the ambient temperature and the atmospheric pressure is determined; wherein the preset environmental correction data table includes preset environmental correction coefficients corresponding to different combinations of preset ambient temperature values ​​and preset atmospheric pressure values.

[0016] Preferably, determining the post-injection amount base value under the current operating condition of the vehicle according to the vehicle operating condition information includes:

[0017] In a preset post-injection amount data table, a post-injection amount basic value corresponding to the engine speed value and the engine power value is determined; wherein the preset post-injection amount data table contains preset post-injection amount basic values ​​corresponding to different combinations of preset engine speed values ​​and preset engine power values.

[0018] Preferably, determining the final post-injection amount value according to the environmental correction coefficient and the post-injection amount base value includes:

[0019] The product of the environmental correction coefficient and the post-injection amount base value is used as the final post-injection amount value.

[0020] Preferably, the fuel injection is performed according to the final post-injection amount value to promote the reduction desulfurization reaction of the LNT, including:

[0021] According to the final post-injection amount value, a fuel injection instruction is sent to the fuel injection device, so that the fuel injection device injects fuel to the engine according to the final post-injection amount value; the fuel burns to form a preset high-temperature reducing gas, and the reducing gas enters the LNT to undergo a reduction desulfurization reaction.

[0022] A second aspect of the present invention provides a desulfurization system for LNT, comprising:

[0023] A detection module, for collecting current environmental information and vehicle operating condition information in real time when detecting that the LNT enters the desulfurization mode, wherein the environmental information at least includes the ambient temperature and the atmospheric pressure;

[0024] An environmental correction module, used to determine an environmental correction coefficient according to the environmental information;

[0025] A post-injection amount determination module, used to determine a post-injection amount basic value under the current working condition of the vehicle according to the vehicle working condition information;

[0026] A post-injection amount correction module, used for determining a final post-injection amount value according to the environmental correction coefficient and the post-injection amount basic value;

[0027] The desulfurization working module is used to perform fuel injection according to the final post-injection amount value to promote the LNT to undergo a reduction desulfurization reaction.

[0028] Preferably, the environment correction module comprises:

[0029] A first receiving unit, configured to receive the environmental information sent by the detection module, wherein the environmental information at least includes an environmental temperature and an atmospheric pressure;

[0030] An environmental correction data storage unit, used to store preset environmental correction coefficients corresponding to different combinations of preset environmental temperature values ​​and preset atmospheric pressure values;

[0031] A first search unit, configured to screen the environmental correction data unit according to the environmental temperature and the atmospheric pressure to determine the corresponding environmental correction coefficient;

[0032] Preferably, the post-injection amount determination module includes:

[0033] A second receiving unit, configured to receive the vehicle operating condition information sent by the detection module, wherein the vehicle operating condition information at least includes an engine speed and an engine power;

[0034] A post-injection amount data storage unit, used to store preset post-injection amount basic values ​​corresponding to different combinations of preset engine speed values ​​and preset engine power values;

[0035] A second search unit is used to filter the post-injection amount data storage unit according to the engine speed and the engine power to determine the corresponding post-injection amount basic value under the current working condition;

[0036] A third aspect of an embodiment of the present invention provides an electronic device, including:

[0037] one or more processors; and

[0038] One or more machine-readable media having instructions stored thereon, when executed by the one or more processors, enable the electronic device to perform the method as described in any one of the first aspects.

[0039] A fourth aspect of an embodiment of the present invention provides one or more machine-readable storage media having instructions stored thereon, which, when executed by one or more processors, enable the processors to execute the method as described in any one of the first aspects.

[0040] The technical solution of the present invention has at least the following advantages:

[0041] After detecting that the LNT system has entered the desulfurization mode, the present invention uses the real-time collected ambient temperature data, atmospheric pressure data, engine speed data and engine power data to obtain the environmental correction coefficient and the basic value of the post-injection amount under the current working condition, and finally determines the final post-injection amount value, and sends a command to inject fuel according to this value to promote the reduction desulfurization of the LNT. Under the premise of achieving high LNT desulfurization efficiency under normal temperature conditions, by correcting the engine post-injection amount, the LNT desulfurization effect under extreme ambient temperature and ambient pressure is optimized while avoiding the ablation problem of the LNT catalyst. It is conducive to further tapping the potential of the LNT catalyst and expanding the scope of use of the LNT catalyst system.

[0042] On the one hand, the desulfurization efficiency of LNT is guaranteed. The present invention uses the real-time collected ambient temperature data, atmospheric pressure data, engine speed data and engine power data to appropriately adjust the final post-injection amount value, thereby offsetting the influence of environmental factors, ensuring that the sulfur adsorbed in the LNT can be completely removed, avoiding various problems such as incomplete desulfurization and LNT ablation damage when the vehicle is driving in extreme environments, improving the driving performance of the vehicle in extreme environments, and optimizing the performance of the vehicle.

[0043] On the other hand, the performance of the LNT system is protected. The present invention ensures the complete desorption of sulfur in the LNT by regulating the amount of post-injection fuel, and also avoids the situation in which the temperature in the LNT system is too high in a high temperature environment, causing the LNT catalyst to be burned and damaged, thereby avoiding damage to the LNT system.

[0044] On the other hand, the cost is low and it is easy to promote. The desulfurization method proposed by the present invention is to improve the desulfurization effect by adjusting the amount of fuel injection according to the collected environmental information. This method does not require the installation of additional hardware on the electronically controlled engine, so the implementation cost is low.

[0045] On the other hand, the application range is wide. Due to the different parameters of the vehicle system, the environmental correction coefficient and the post-injection amount can be changed with the changes of the engine system and the LNT catalyst. For vehicles of different manufacturers and brands, this method can be implemented, and only the relevant parameters need to be modified according to different configurations. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0047] Figure 1 This is a schematic diagram of the lean combustion stage reaction proposed in one embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram of a rich combustion stage reaction proposed in one embodiment of the present invention;

[0049] Figure 3 is a flow chart of a desulfurization method proposed in one embodiment of the present invention;

[0050] Figure 4 is an example table of environmental correction coefficients proposed in one embodiment of the present invention;

[0051] Figure 5 is an example table of basic values ​​of post-injection fuel quantity proposed in one embodiment of the present invention;

[0052] Figure 6 It is a structural diagram of a desulfurization system proposed in one embodiment of the present invention. DETAILED DESCRIPTION

[0053] The exemplary embodiments of the present invention will be described in more detail below in conjunction with the accompanying drawings in the embodiments of the present invention. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0054] To facilitate understanding of the technical solution of the present invention, the LNT desulfurization technology involved in the present invention is first described:

[0055] Lean NOx trap (LNT) is a nitrogen oxide NOx exhaust treatment system. It is a post-treatment technology that uses the concentration change of the engine mixer for periodic adsorption-catalytic reduction. The reaction principle is that in the lean combustion state (high air / fuel ratio), the exhaust gas is in an oxidizing atmosphere. Under the action of the catalyst, NOx is adsorbed on the surface of the LNT in the form of nitrate; when the engine is switched to the rich combustion state (low air / fuel ratio), the reducing substances such as hydrocarbons and carbon monoxide in the exhaust increase. Under the action of the catalyst, the nitrate is decomposed and released into N2. LNT reduces NOx emissions by alternating the two working stages of adsorption and trapping and catalytic reduction. Lean NOx trap LNT generally uses precious metal Pt as the catalytic active component, alkali and / or alkaline earth metal oxides as the storage component, and uses large specific surface γ-Al2O3 as the carrier to improve the dispersion of the active component and the storage component. The typical LNT system is Pt / BaO / Al2O3, which is also the first LNT catalyst developed and put on the market by Toyota.

[0056] The following descriptions are all based on the Pt / BaO / Al2O3 LNT system as an example. It is important to note that the chemical composition of the catalyst, adsorbent material, and carrier of different LNT traps will vary slightly, but will not affect the occurrence of the following chemical reactions;

[0057] The chemical reaction of LNT is complex, mainly including adsorption reaction in the lean combustion stage and desorption reaction in the rich combustion stage.

[0058] Figure 1 The diagram is a reaction diagram of the lean burn stage. Lean burn stage: LNT temporarily stores the adsorbed nitrogen oxides NOx in the form of nitrates on the carrier. NO is oxidized to NO2 on the precious metal active site Pt, and then NO2 reacts with the adjacent alkaline component BaO to form nitrate Ba(NO3)2 and is stored; the chemical reaction formulas involved include:

[0059] 2NO+O2→2NO2

[0060]

[0061] Figure 2The diagram is a reaction diagram of the rich combustion stage. Rich combustion stage: LNT reduces the nitrate Ba(NO3)2 stored on the carrier into N2 and releases it. Currently, two methods are used: injecting fuel into the cylinder and directly injecting the reducing agent into the tailpipe. The injected reducing agent is mainly fuel and H2. Within a short period of time (about 3-5 seconds), the concentration of reducing components HC, CO and H2 in the exhaust gas increases rapidly. The nitrate stored in the reducing atmosphere is thermodynamically unstable and will quickly release NO2 and be reduced to N2 by the reducing agent. At the same time, the catalyst storage position is regenerated. The chemical reaction formulas involved include:

[0062] Ba(NO3)2→BaO+NO2

[0063]

[0064]

[0065] BaO+CO2→BaCO3

[0066] The main problem facing the LNT system is sulfur poisoning. The sulfur in the exhaust gas can easily react with the storage component Ba to form BaSO4. Since sulfate is more stable than nitrate, once the storage component reacts with the sulfur in the exhaust gas to form BaSO4, it will no longer react with NOx, resulting in a decrease in the catalyst storage capacity or even deactivation. There are two main pathways for the catalyst to react with sulfur:

[0067] (1) Under lean combustion conditions at 350°C, sulfur enters the LNT and first forms surface barium sulfate, which then transfers from the surface to the bulk phase to form bulk sulfate. These bulk sulfates are difficult to be reduced by reducing substances in the fuel at temperatures below 550°C. The irreversible blockage of the Ba position leads to a decrease in the catalyst storage capacity.

[0068] (2) Under rich-burn conditions between 350 and 500 °C, the reduced sulfur species are deposited on Pt and are subsequently oxidized again under lean-burn conditions to form sulfates, which cover the metal surface and reduce the redox properties of the precious metal.

[0069] Among them, the commonly used desulfurization method is to eliminate the sulfur in the LNT by changing the driving conditions of the engine. For example, the engine ECU calculates the amount of sulfur entering the LNT from the fuel and oil according to the strategy. When the engine ECU detects that the sulfur content in the LNT reaches a certain limit, it issues a command to control the vehicle to enter the desulfurization mode. Then the engine increases the post-injection fuel injection. The post-injection fuel combustion produces HC gas with strong reducing properties and increases the temperature in the cylinder. Under high temperature conditions, a redox reaction occurs on the Al2O3 matrix in the LNT, BaSO4 is reduced to Ba0, and the active sites on the carrier can be regenerated and precipitated.

[0070] However, the technical means for the engine to perform post-injection fuel injection is: the fuel injection device performs injection. In the related art, the amount of post-injection fuel of the fuel injection device depends on the current engine speed and power, without considering the impact of the environment on the desulfurization reaction. That is, the existing LNT desulfurization method is only applicable to normal temperature environmental conditions in plain areas, and is not applicable to extreme environments. When the ambient temperature is low, the temperature of the catalyst carrier during LNT desulfurization is lower than that under normal temperature conditions, resulting in poor desulfurization effect (less sulfur is removed); when the ambient temperature is high, the catalyst temperature during LNT desulfurization will be high, which can easily cause ablation of the LNT catalyst; in addition, because the oxygen concentration in the air is directly related to the atmospheric pressure, as the oxygen concentration decreases, the desulfurization effect of LNT will also deteriorate.

[0071] In view of this, the present invention proposes a desulfurization method for LNT. First, after detecting that the vehicle LNT system enters the desulfurization mode, the corresponding environmental correction coefficient is found from the preset database using the environmental information collected in real time; and the basic value of the post-injection amount under the current working condition is calculated according to the current vehicle condition data. Then, the basic value of the post-injection amount is adjusted according to this environmental correction coefficient to determine the final post-injection amount value. Finally, according to this value, an instruction is sent to inject fuel to promote the reduction desulfurization of LNT, thereby achieving the purpose of adjusting the post-injection amount in the desulfurization mode according to environmental conditions and optimizing the desulfurization effect.

[0072] Based on the above description, the technical solution of the embodiment of the present invention is introduced as follows. Specific embodiment 1

[0074] Figure 3 The flow chart of the desulfurization method provided by the embodiment of the present invention is shown. Figure 1 This embodiment provides a desulfurization method for LNT, which may specifically include the following steps:

[0075] Step 101 : when it is detected that the LNT enters the desulfurization mode, current environmental information and vehicle operating condition information are collected in real time, wherein the environmental information at least includes the ambient temperature and the atmospheric pressure.

[0076] When the vehicle is driving, the LNT system will continue to absorb sulfides in the exhaust gas. When the ECU module on the vehicle calculates that the sulfur absorbed by the LNT system reaches a certain value, it will issue a command to enter the desulfurization mode, first collecting environmental information and vehicle operating condition information.

[0077] The environmental information includes at least the ambient temperature and atmospheric pressure. In practice, the environmental information may also include reference data such as ambient humidity and oxygen content. The vehicle operating condition information should include at least the engine speed and engine power. In practice, the vehicle operating condition information may also include reference data such as air intake flow, throttle opening, and motor power. In this embodiment, the vehicle or engine operating environment temperature ranges from -30°C to 40°C, and the atmospheric pressure ranges from 100kpa to 50kpa.

[0078] In practice, environmental information can be collected through corresponding sensors on the vehicle. In vehicle operating information, engine speed can be collected by an engine speed sensor, and engine power can be calculated from torque and speed.

[0079] ECU (Electrica control unit) is a microcomputer controller for automobiles. The CPU module in the ECU has computing and control functions. When the engine is running, it can collect signals from various sensors, perform calculations, and convert the results of the calculations into control signals to control the operation of the controlled object. In this embodiment, relevant data collection, calculations and instruction sending can all be completed by the ECU.

[0080] Step 201: Determine an environmental correction coefficient based on the environmental information.

[0081] In this embodiment, when designing a vehicle, different environmental information and their corresponding environmental correction coefficients are compiled into a chart and stored in the ECU based on data obtained through precise calculations and a large number of experiments. According to the environmental information collected in real time, the corresponding environmental correction coefficient can be found from the relevant chart. This chart can be referred to Figure 4 For example, when the collected environmental information shows that the ambient temperature is -30°C and the atmospheric pressure is 0.5 bar, Figure 4 The corresponding environmental correction coefficient can be found to be 1.5. In this embodiment, the range of the environmental correction coefficient can be determined to be 0.8-2.0.

[0082] Step 301, determining a basic value of a post-injection amount under a current vehicle operating condition according to the vehicle operating condition information.

[0083] In the same manner, in this embodiment, when designing a vehicle, the inventor compiled different vehicle operating conditions information and their corresponding basic values ​​of post-injection fuel quantity into a chart based on data obtained through precise calculations and a large number of experiments and stored it in the ECU. According to the vehicle operating condition information collected in real time, the corresponding basic value of post-injection fuel quantity can be found from the relevant chart. This chart can be referred to Figure 5For example, when the collected engine speed is 2200rpm and the engine power is 90kw, Figure 5 The corresponding basic value of post-injection amount can be found to be 3.3.

[0084] Step 401, determining a final post-injection amount value according to the environmental correction coefficient and the post-injection amount base value.

[0085] The post-injection amount base value represents the post-injection amount when the vehicle is generally in desulfurization mode under the current working conditions. The environmental correction factor can be used to characterize the impact of environmental factors on the desulfurization effect. In one embodiment, the product of the environmental correction factor and the post-injection amount base value can be used as the final post-injection amount value. It should be noted that the calculation method for determining the final post-injection amount value is not limited to multiplication, which is related to the calculation method of the environmental correction factor.

[0086] Step 501 , injecting fuel according to the final post-injection amount value to promote the reduction desulfurization reaction of the LNT.

[0087] After confirming the final injection amount, the ECU sends an injection command according to this injection amount value. After receiving the command, the fuel injection device injects fuel into the engine combustion chamber to promote the redox reaction of the sulfur adsorbed in the LNT and desorb it, so that the active sites on the LNT system carrier are regenerated and precipitated.

[0088] This embodiment proposes that after the vehicle enters the desulfurization mode, environmental information and current vehicle condition information are first collected, and the fuel injection amount in the desulfurization mode is corrected by using such information data, so as to achieve excellent LNT desulfurization effect under extreme ambient temperature and ambient pressure. This method offsets the influence of environmental factors, ensures that the sulfur adsorbed in the LNT can be completely removed, and avoids the situation where the temperature in the LNT system is too high in a high temperature environment, causing the LNT catalyst to be burned and damaged, optimizes the driving performance and performance of the vehicle in extreme environments, and is conducive to further tapping the potential of the LNT catalyst and expanding the scope of use of the LNT catalyst system.

[0089] In a feasible implementation manner, determining the environment correction coefficient according to the environment information includes:

[0090] In a preset environmental correction data table, an environmental correction coefficient corresponding to the ambient temperature and the atmospheric pressure is determined; wherein the preset environmental correction data table includes preset environmental correction coefficients corresponding to different combinations of preset ambient temperature values ​​and preset atmospheric pressure values.

[0091] During the vehicle design process, the effects of different ambient temperatures and atmospheric pressures on the LNT desulfurization effect were tested through precise calculations and a large number of experiments, and the corresponding environmental correction coefficients were obtained from the experiments. The experimentally obtained environmental correction coefficients and the corresponding ambient temperature values ​​and atmospheric pressure values ​​are stored in the ECU in the form of charts to form a preset environmental correction data table. After the vehicle enters the desulfurization mode, the corresponding preset environmental correction coefficients can be screened out in the preset environmental correction data table based on the ambient temperature values ​​and atmospheric pressure values ​​collected in real time.

[0092] In a feasible implementation manner, determining the post-injection amount base value under the current operating condition of the vehicle according to the vehicle operating condition information includes:

[0093] In a preset post-injection amount basic value data table, a post-injection amount basic value corresponding to the engine speed value and the engine power value is determined; wherein the preset post-injection amount data table contains preset post-injection amount basic values ​​corresponding to different combinations of preset engine speed values ​​and preset engine power values.

[0094] During the vehicle design process, through precise calculations and a large number of experiments, the corresponding post-injection amount basic value under different engine speed and power conditions is obtained. The experimental post-injection amount basic value and the corresponding engine speed and engine power are stored in the ECU in the form of a chart to form a preset post-injection amount data table. After the vehicle enters the desulfurization mode, the corresponding preset post-injection amount basic value can be screened out in the preset post-injection amount data table according to the engine speed and engine power collected in real time. The conventional vehicle desulfurization method is to inject fuel according to the post-injection amount basic value for reduction desulfurization.

[0095] In a feasible implementation manner, the fuel injection is performed according to the final post-injection amount value to promote the reduction desulfurization reaction of the LNT, including:

[0096] According to the final post-injection amount value, a fuel injection instruction is sent to the fuel injection device, so that the fuel injection device injects fuel to the engine according to the final post-injection amount value; the fuel burns to form a preset high-temperature reducing gas, and the reducing gas enters the LNT to undergo a reduction desulfurization reaction.

[0097] The fuel injection device of the engine is a precision device with very high processing accuracy. It accurately controls the fuel injection amount by receiving the injection pulse signal sent by the ECU. After the post-injection amount is corrected, the ECU sends an injection command to the fuel injection device according to the injection amount value. After receiving the command, the fuel injection device injects fuel into the engine combustion chamber. The combustion of fuel increases the temperature to reach the expected desulfurization temperature. The rich exhaust gas produced by the combustion also contains reducing gas. The high-temperature reducing gas enters the LNT system and undergoes an oxidation-reduction reaction with the sulfur adsorbed in the LNT, which causes the sulfur to desorb and the active sites on the LNT system carrier to regenerate and precipitate.

[0098] This embodiment forms a chart of the obtained relevant environmental correction data and the basic value of the post-injection amount through a large number of experiments and precise calculations in advance and stores it in the ECU of the vehicle. When the vehicle enters the desulfurization mode, the corresponding environmental correction coefficient and the basic value of the post-injection amount can be directly obtained from the chart according to the environmental information and vehicle operating condition information collected by the sensor in real time. This embodiment first conducts a large number of experiments, obtains the numerical relationship between environmental factors and the optimal post-injection amount through experiments, and stores the experimental data in the ECU, avoiding the ECU from performing relevant data calculations, simplifying the desulfurization process, and improving the desulfurization rate. In addition, by controlling variables in the experiment, the obtained values ​​can be made more accurate. In practice, by accumulating more experimental data, the prepared environmental correction coefficient table and the post-injection amount data table can be made more detailed and rich, so that the desulfurization effect of this method is more excellent.

[0099] In addition, the desulfurization method proposed in the present invention is to adjust the post-injection amount according to the collected environmental information to improve the desulfurization effect. This method does not require the installation of additional hardware on the electronically controlled engine, so the implementation cost is low and it is easy to promote. Moreover, due to the different parameters of the vehicle system, the environmental correction coefficient and the post-injection amount can be changed with the changes of the engine system and the LNT catalyst. For vehicles of different manufacturers and brands, this method can be implemented, and only the relevant parameters need to be modified according to different configurations. Therefore, the present invention is also open and flexible, and has a wide range of applications. Specific embodiment 2

[0101] Based on the same inventive concept, another embodiment of the present invention provides a desulfurization system for LNT, such as Figure 6 As shown, the desulfurization system includes:

[0102] The detection module is used to collect current environmental information and vehicle operating condition information in real time when it is detected that the LNT enters the desulfurization mode, wherein the environmental information at least includes the ambient temperature and the atmospheric pressure.

[0103] The environment correction module is used to determine the environment correction coefficient according to the environment information.

[0104] The post-injection amount determination module is used to determine a post-injection amount basic value under the current working condition of the vehicle according to the vehicle working condition information.

[0105] The post-injection amount correction module is used to determine a final post-injection amount value according to the environmental correction coefficient and the post-injection amount basic value.

[0106] The desulfurization working module is used to perform fuel injection according to the final post-injection amount value to promote the LNT to undergo a reduction desulfurization reaction.

[0107] This embodiment, after detecting that the LNT system has entered the desulfurization mode, uses the environmental information and vehicle operating condition information collected in real time to obtain the environmental correction coefficient and the basic value of the post-injection amount under the current operating condition, and finally determines the final post-injection amount value, and performs fuel injection according to this value, so that the LNT undergoes reduction desulfurization. By correcting the post-injection amount of the engine, under the premise of achieving high LNT desulfurization efficiency under normal temperature conditions, by correcting the post-injection amount of the engine, the LNT desulfurization effect under extreme ambient temperature and ambient pressure is achieved, and the poor LNT desulfurization effect is avoided while avoiding the ablation of the LNT catalyst, protecting the LNT system from damage, which is conducive to further tapping the potential of the LNT catalyst, expanding the scope of use of the LNT catalyst system, and improving the performance of the vehicle.

[0108] In a feasible implementation manner, the environment correction module includes:

[0109] The first receiving unit is used to receive the environmental information sent by the detection module, where the environmental information at least includes the environmental temperature and the atmospheric pressure.

[0110] The environmental correction data storage unit is used to store preset environmental correction coefficients corresponding to different combinations of preset environmental temperature values ​​and preset atmospheric pressure values.

[0111] The first search unit is used to screen the environmental correction data unit according to the environmental temperature and the atmospheric pressure to determine the corresponding environmental correction coefficient.

[0112] This embodiment tests the influence of different ambient temperatures and atmospheric pressures on the desulfurization effect of LNT through precise calculations and a large number of experiments during the vehicle design process, and obtains the corresponding environmental correction coefficient value from the experiment. The environmental correction coefficient obtained from the experiment and the corresponding ambient temperature value and atmospheric pressure value are stored in the environmental correction data storage unit in the form of a chart. After the vehicle enters the desulfurization mode, the corresponding preset environmental correction coefficient can be screened out in the preset environmental correction data table according to the ambient temperature value and atmospheric pressure value collected in real time.

[0113] In a feasible implementation manner, the post-injection amount determination module includes:

[0114] The second receiving unit is used to receive the vehicle operating condition information sent by the detection module, and the vehicle operating condition information at least includes engine speed and engine power.

[0115] The post-injection amount data storage unit is used to store preset post-injection amount basic values ​​corresponding to different combinations of preset engine speed values ​​and preset engine power values.

[0116] The second search unit is used to filter the post-injection amount data storage unit according to the engine speed and the engine power to determine the corresponding post-injection amount basic value under the current working condition.

[0117] During the vehicle design process, the corresponding post-injection amount basic value under different engine speed and power conditions is obtained through precise calculations and a large number of experiments. The experimental post-injection amount basic value and the corresponding engine speed and engine power are stored in the post-injection amount data storage unit in the form of a chart. After the vehicle enters the desulfurization mode, the corresponding preset post-injection amount basic value can be screened out in the preset post-injection amount data table according to the engine speed and engine power collected in real time.

[0118] Based on the same inventive concept, an embodiment of the present invention further provides an electronic device, including:

[0119] one or more processors; and

[0120] One or more machine-readable media having instructions stored thereon, when executed by the one or more processors, enable the electronic device to perform a desulfurization method for LNT as provided in the first embodiment of the present invention.

[0121] Based on the same inventive concept, an embodiment of the present invention further provides one or more machine-readable storage media, characterized in that instructions are stored thereon, which, when executed by one or more processors, enable the processor to execute a LNT desulfurization method as provided in Embodiment 1 of the present invention.

[0122] As for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0123] Each embodiment in this specification focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referenced to each other.

[0124] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0125] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0126] The above is a detailed introduction to the desulfurization method, system, electronic device and medium of LNT provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for desulfurization of LNT, characterized in that: The method comprises: When it is detected that the LNT enters the desulfurization mode, current environmental information and vehicle operating condition information are collected in real time, wherein the environmental information at least includes ambient temperature, atmospheric pressure, ambient humidity and oxygen content; Determining an environmental correction coefficient according to the environmental information; Determining a post-injection fuel quantity basic value under a current operating condition of the vehicle according to the vehicle operating condition information; Determining a final post-injection amount value according to the environmental correction coefficient and the post-injection amount base value; Injecting fuel according to the final post-injection amount value to promote a reduction desulfurization reaction of the LNT; Wherein, determining the post-injection amount basic value under the current operating condition of the vehicle according to the vehicle operating condition information includes: The experimentally obtained post-injection amount basic value and the corresponding engine speed and engine power are stored in the ECU in the form of a chart to form a preset post-injection amount data table; in the preset post-injection amount data table, the post-injection amount basic value corresponding to the engine speed value and the engine power value is determined; wherein the preset post-injection amount data table contains preset post-injection amount basic values ​​corresponding to different combinations of preset engine speed values ​​and preset engine power values.

2. The method according to claim 1, characterized in that The vehicle operating condition information includes at least engine speed and engine power.

3. The method according to claim 1, characterized in that: Determining the final post-injection amount value according to the environmental correction coefficient and the post-injection amount base value includes: The product of the environmental correction coefficient and the post-injection amount base value is used as the final post-injection amount value.

4. The method according to claim 1, characterized in that: The fuel injection is performed according to the final post-injection amount value to promote the reduction desulfurization reaction of the LNT, including: According to the final post-injection amount value, a fuel injection instruction is sent to the fuel injection device, so that the fuel injection device injects fuel to the engine according to the final post-injection amount value; the fuel burns to form a preset high-temperature reducing gas, and the reducing gas enters the LNT to undergo a reduction desulfurization reaction.

5. A desulfurization system for LNT, characterized in that: The system comprises: A detection module, for collecting current environmental information and vehicle operating condition information in real time when detecting that the LNT enters the desulfurization mode, wherein the environmental information at least includes ambient temperature, atmospheric pressure, ambient humidity and oxygen content; An environmental correction module, used to determine an environmental correction coefficient according to the environmental information; A post-injection amount determination module, used to determine a post-injection amount basic value under the current working condition of the vehicle according to the vehicle working condition information; A post-injection amount correction module, used for determining a final post-injection amount value according to the environmental correction coefficient and the post-injection amount basic value; A desulfurization working module, used for performing fuel injection according to the final post-injection fuel quantity value to promote a reduction desulfurization reaction of the LNT; Wherein, the post-injection amount determination module includes: A second receiving unit, configured to receive the vehicle operating condition information sent by the detection module, wherein the vehicle operating condition information at least includes an engine speed and an engine power; A post-injection amount data storage unit, used to store preset post-injection amount basic values ​​corresponding to different combinations of preset engine speed values ​​and preset engine power values ​​into the ECU to form a preset post-injection amount data table; The second search unit is used to filter the post-injection amount data storage unit according to the engine speed and the engine power to determine the corresponding post-injection amount basic value under the current working condition.

6. An electronic device, characterized in that: include: one or more processors; and One or more machine-readable media having instructions stored thereon, when executed by the one or more processors, cause the electronic device to perform the method as claimed in any one of claims 1 to 4.

7. One or more machine-readable storage media, characterized in that Instructions are stored thereon, which, when executed by one or more processors, cause the processors to perform the method according to any one of claims 1 to 4.

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