Engine aftertreatment system, control method and vehicle

Abstract

The invention relates to the technical field of vehicles, in particular to an engine aftertreatment system, a control method and a vehicle, and the system comprises an engine and an exhaust manifold of the engine; the exhaust manifold is connected with the converter through a main pipeline; the deoxidation assembly is arranged on the main pipeline; the bypass assembly is connected with the main pipeline, the first end of the bypass assembly is arranged between the exhaust manifold and the deoxidation assembly, and the second end of the bypass assembly is arranged between the deoxidation assembly and the converter. The regeneration assembly is used for regenerating a deoxidizing agent carrier in the deoxidizing assembly; the detection assembly is used for detecting the gas concentration between the deoxidation assembly and the converter; the controller is connected with the deoxidation assembly, the bypass assembly, the regeneration assembly and the detection assembly and used for controlling at least one of the deoxidation assembly, the bypass assembly, the regeneration assembly and the detection assembly to treat the engine tail gas according to the gas concentration detected by the detection assembly. Therefore, the problems of low exhaust efficiency, high control difficulty and the like of engine tail gas in related technologies are solved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to an engine after-treatment system, a control method and a vehicle. Background Art

[0002] Lean burn technology, with its excellent fuel economy, thermal efficiency and lower conventional emissions, is regarded as an important direction for the future development of gasoline engines. However, when the engine runs with a mixture that deviates from the theoretical air-fuel ratio, the performance of the traditional three-way catalytic converter is limited, especially in dealing with nitrogen oxides (NOx), and its conversion efficiency is significantly reduced.

[0003] In the related technology, EGR (Exhaust Gas Recirculation) technology is used to reduce the combustion temperature in the cylinder and reduce the original NOx emissions of the engine. At the same time, TWC (Three-Way Catalytic Converter) is used to complete the treatment of the exhaust gas in the exhaust under the stoichiometric ratio. This method is only applicable to equivalent ratio combustion natural gas engines, not to lean burn natural gas engines, which limits the possibility of further improving the thermal efficiency of natural gas engines.

[0004] Another solution is to introduce additional reductants to convert NOx into nitrogen and water in the form of chemical reactions in the SCR (Selective Catalytic Reduction) to achieve NOx emission control, but the SCR needs to be regularly filled with reductants, and the reductant injection system is complex to control. At the same time, it has a large system volume and high requirements for vehicle layout, so this solution is difficult to apply to light passenger vehicles. Summary of the invention

[0005] The present application provides an engine after-treatment system, a control method and a vehicle to solve the problems of low exhaust efficiency and great control difficulty of engine exhaust in related technologies.

[0006] A first aspect of the present application provides an engine aftertreatment system, comprising: an engine and an exhaust manifold of the engine; a converter, wherein the exhaust manifold is connected to the converter via a main pipe; a deoxidation component, wherein the deoxidation component is arranged on the main pipe; a bypass component, wherein the bypass component is connected to the main pipe, a first end of the bypass component is arranged between the exhaust manifold and the deoxidation component, and a second end of the bypass component is arranged between the deoxidation component and the converter; a regeneration component for regenerating a deoxidizer carrier in the deoxidation component; a detection component for detecting a gas concentration between the deoxidation component and the converter; a controller, wherein the controller is respectively connected to the deoxidation component, the bypass component, the regeneration component and the detection component, and is used to control at least one of the deoxidation component, the bypass component, the regeneration component and the detection component to process engine exhaust according to the gas concentration detected by the detection component.

[0007] Optionally, the deoxygenation component includes a first control valve and a deoxygenator, wherein the control valve is used to control the opening and closing of the deoxygenator pipeline, and the deoxygenator is used to deoxygenate the engine exhaust.

[0008] Optionally, the regeneration component includes a crankcase ventilation system, an air storage tank, a second control valve and a third control valve, wherein the second control valve is used to control the on-off of the pipeline between the crankcase ventilation system and the deoxidizer, and the third control valve is used to control the on-off of the pipeline between the air storage tank and the deoxidizer.

[0009] Optionally, the detection component includes a first oxygen concentration sensor, a second oxygen concentration sensor and a NOx concentration sensor, wherein the first oxygen concentration sensor is arranged on the pipeline between the deoxidizer and the second end, the second oxygen concentration sensor and the NOx concentration sensor are arranged on the pipeline between the second end and the converter, the first oxygen concentration sensor is used to detect a first oxygen partial pressure after the deoxidizer carrier, the second oxygen concentration sensor is used to detect a second oxygen partial pressure on the main pipe after the second end point, and the first oxygen concentration sensor is used for the NOx partial pressure on the main pipe after the second end point.

[0010] Optionally, the bypass assembly includes a bypass pipeline and a bypass valve arranged on the bypass pipeline, wherein the bypass valve is used to control the opening and closing of the bypass pipeline.

[0011] A second aspect of the present application provides a vehicle, including: an engine after-treatment system as described in the above embodiment.

[0012] The third aspect of the present application provides a method for controlling an engine aftertreatment system, which is used for controlling the engine aftertreatment system of the above embodiment, and includes the following steps: obtaining the air-fuel ratio of the engine and the first oxygen partial pressure after the deoxidizer carrier; determining the target operating condition of the engine aftertreatment system according to the air-fuel ratio and the first oxygen partial pressure; and controlling the engine aftertreatment system to perform the target processing action according to the target operating condition.

[0013] Optionally, the target operating condition includes first to third operating conditions, and the target operating condition of the engine aftertreatment system is determined based on the air-fuel ratio and the first oxygen partial pressure, including: if the air-fuel ratio is less than or equal to a preset value, the target operating condition is determined to be the first operating condition; if the air-fuel ratio is greater than the preset value and the first oxygen partial pressure is less than the partial pressure threshold, the target operating condition is determined to be the second operating condition; if the air-fuel ratio is greater than the preset value and the first oxygen partial pressure is greater than or equal to the partial pressure threshold, the target operating condition is determined to be the third operating condition.

[0014] Optionally, the engine aftertreatment system is controlled to perform a target processing action according to the target operating condition, including: if the target operating condition is the first operating condition, the bypass valve is controlled to be opened and the first to third control valves are controlled to be closed; if the target operating condition is the second operating condition, when the second oxygen partial pressure is greater than the NOx partial pressure, the first control valve opening is controlled to increase, the bypass valve opening is controlled to decrease, and the second and third control valves are closed; when the second oxygen partial pressure is equal to the NOx partial pressure, the current openings of the first control valve and the bypass valve are controlled to remain unchanged, and the second and third control valves are closed; if the target operating condition is the third operating condition, when the second oxygen partial pressure is greater than the NOx partial pressure, the first control valve opening is controlled to be maximum, the second control valve opening is increased, and the bypass valve and the third control valve are closed; when the second oxygen partial pressure is equal to the NOx partial pressure, the first control valve opening is controlled to be maximum, the second control valve opening is controlled to remain unchanged, and the bypass valve and the third control valve are closed; when the second oxygen partial pressure is less than the NOx partial pressure and is equal, the first control valve opening is controlled to be maximum, the second control valve opening is controlled to decrease, and the bypass valve and the third control valve are closed.

[0015] Optionally, after controlling the first control valve to have a maximum opening, increasing the second control valve opening, and closing the bypass valve and the third control valve, it also includes: identifying the current opening of the second control valve; if the current opening is the maximum opening, controlling the third control valve to have a maximum opening.

[0016] Therefore, this application includes the following beneficial effects:

[0017] The embodiment of the present application can adjust the oxygen partial pressure before entering the converter through precise control of the deoxidation component, thereby optimizing the conversion efficiency of the converter engine exhaust, and the regeneration component ensures that the deoxidizer carrier can be continuously regenerated, avoiding the system performance degradation caused by the deactivation of the deoxidizer and extending the service life. The intelligent control strategy integrated in the controller monitors the gas concentration in real time and dynamically adjusts the opening of the bypass component, reducing the overall volume and complexity of the system, and reducing the manufacturing and maintenance costs. Therefore, the problems of low exhaust efficiency and high control difficulty of engine exhaust in the related technology are solved.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0020] Figure 1 A simplified structural diagram of an engine aftertreatment system provided according to an embodiment of the present application;

[0021] Figure 2 A detailed structural diagram of an engine aftertreatment system provided according to an embodiment of the present application;

[0022] Figure 3 A flow chart of a control method for an engine aftertreatment system provided according to an embodiment of the present application;

[0023] Figure 4 This is an example diagram of a control method for an engine aftertreatment system provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0025] The following describes the engine aftertreatment system, control method and vehicle of the embodiment of the present application with reference to the accompanying drawings. In response to the problems mentioned in the above background technology, the present application provides an engine aftertreatment system, which can adjust the oxygen partial pressure before entering the converter through the precise control of the deoxidation component, thereby optimizing the conversion efficiency of the converter engine exhaust, and the regeneration component ensures that the deoxidizer carrier can be continuously regenerated, avoiding the system performance degradation caused by the deactivation of the deoxidizer and extending the service life. The intelligent control strategy integrated in the controller reduces the overall volume and complexity of the system by real-time monitoring of the gas concentration and dynamically adjusting the opening of the bypass component, thereby reducing the manufacturing and maintenance costs. As a result, the problems of low exhaust efficiency and high control difficulty of engine exhaust in the related technology are solved.

[0026] Specifically, Figure 1 It is a block diagram of an engine aftertreatment system according to an embodiment of the present application.

[0027] like Figure 1 As shown, the engine aftertreatment system 10 includes: an engine 100 , an exhaust manifold 101 of the engine, a converter 200 , a deoxidation component 300 , a bypass component 400 , a regeneration component 500 , a detection component 600 and a controller 700 .

[0028] The exhaust manifold 101 and the converter 200 are connected via a main pipe, the deoxidation component 300 is arranged on the main pipe, the bypass component 400 is connected to the main pipe, the first end of the bypass component 400 is arranged between the exhaust manifold 101 and the deoxidation component 300, and the second end of the bypass component is arranged between the deoxidation component 300 and the converter 200; the regeneration component 500 is used for regenerating the deoxidizer carrier in the deoxidation component, the detection component 600 is used for detecting the gas concentration between the deoxidation component 300 and the converter 200, and the controller 700 is respectively connected to the deoxidation component 300, the bypass component 400, the regeneration component 500 and the detection component 600, and is used to control at least one of the deoxidation component 300, the bypass component 400, the regeneration component 500 and the detection component 600 to process the engine exhaust according to the gas concentration detected by the detection component 600.

[0029] It is understood that the engine 100 of the embodiment of the present application is the core of the entire system and is responsible for the generation of power. The exhaust manifold 101 collects the exhaust gas discharged by each cylinder and then guides it to the post-treatment system for purification. The converter 200 is used to treat harmful substances in the exhaust gas, such as carbon monoxide, hydrocarbons and nitrogen oxides. The deoxidation component 300 includes a deoxidizer carrier for controlling the partial pressure of oxygen entering the converter 200 to optimize the conversion efficiency of the converter 200, especially for the treatment of NOx; the bypass component 400 is composed of two ports, the first port is located between the exhaust manifold 101 and the deoxidation component 300, and the second port is located between the deoxidation component 300 and the converter 200. The bypass component 400 controls the oxygen supply by adjusting the proportion of exhaust gas flowing through the deoxygenation component 300, thereby affecting the working efficiency of the converter 200. Through the intelligent adjustment of the controller 700, it can automatically adjust under different working conditions to ensure that the converter 200 is in the optimal working state, while maintaining the continuous regeneration of the deoxygenation component 300, ultimately achieving the purpose of improving the emission control efficiency. This design not only improves the conversion efficiency of the converter, but also simplifies the control difficulty and reduces the system size.

[0030] In the embodiments of the present application, Figure 2 As shown, the deoxygenation component 300 includes a first control valve 301 and a deoxygenator 302, wherein the first control valve 301 is used to control the opening and closing of the deoxygenator pipeline 302, and the deoxygenator 302 is used to deoxygenate the engine exhaust gas. The regeneration component 500 includes a crankcase ventilation system 501, an air storage tank 502, a second control valve 503 and a third control valve 504, wherein the second control valve 503 is used to control the on-off of the pipeline between the crankcase ventilation system 501 and the deoxygenator 302, and the third control valve 504 is used to control the on-off of the pipeline between the air storage tank 502 and the deoxygenator 302.

[0031] In one embodiment of the present application, Figure 2As shown, the detection component 600 includes a first oxygen concentration sensor 601, a second oxygen concentration sensor 603 and a NOx concentration sensor 602, wherein the first oxygen concentration sensor 601 is arranged on the pipeline between the deoxidizer 302 and the second end, the second oxygen concentration sensor 603 and the NOx concentration sensor 602 are arranged on the pipeline between the second end and the converter 200, the first oxygen concentration sensor 601 is used to detect the first oxygen partial pressure after the deoxidizer carrier, the second oxygen concentration sensor 603 is used to detect the second oxygen partial pressure on the main pipeline after the second end, and the NOx concentration sensor 602 is used for the NOx partial pressure on the main pipeline after the second end. The bypass component 400 includes a bypass pipeline and a bypass valve 401 arranged on the bypass pipeline, wherein the bypass valve 401 is used to control the opening and closing of the bypass pipeline.

[0032] Specifically, the exhaust gas in the cylinder of the natural gas engine combustion system of the embodiment of the present application is divided into two paths after passing through the exhaust manifold 101, one path flows into the converter 200 through the bypass valve 401, and the other path flows into the converter 200 through the first control valve 301 and the deoxidizer 302. In the actual implementation process, the first oxygen concentration sensor 601, the second oxygen concentration sensor 603 and the NOx concentration sensor 602 input the detected oxygen partial pressure and NOx partial pressure into the controller 600, and the controller 600 completes signal processing and gives instructions to control the bypass valve 401 and the first control valve 301, the second control valve 503, and the third control valve 504.

[0033] Among them, as a possible implementation method, the deoxidizer 302 is connected in series with the first control valve 301, the crankcase ventilation system 501 is connected in series with the second control valve 503, and the air storage tank 502 is connected in series with the second control valve 503. After the two are connected in parallel, they are passed between the deoxidizer 302 and the first control valve 301. The above structures are connected in parallel with the bypass valve 401.

[0034] Combine the following Figure 2 The working principle of the engine aftertreatment system of the embodiment of the present application is described in detail as follows:

[0035] The natural gas engine combustion system and the exhaust manifold 101 constitute the engine 100, which functions to generate the original exhaust of the engine; the deoxidizer 302, the first control valve 301, the bypass valve 401, the NOx concentration sensor 602, and the second oxygen concentration sensor 603 are used to detect the oxygen partial pressure and the NOx partial pressure; the crankcase ventilation system 501 and the second control valve 503, the first oxygen concentration sensor 601, the gas tank 502 and the second control valve 503 can introduce crankcase ventilation to the deoxidizer carrier to achieve the regeneration of the deoxidizer carrier; the converter 200 and the second oxygen concentration sensor 603 can be used to treat harmful substances in the exhaust gas.

[0036] like Figure 2 As shown, the first control valve 301 is physically connected to the deoxidizer 302 through a pipeline, the crankcase ventilation system 501 is physically connected to the second control valve 503 through a pipeline, the air storage tank 502 is physically connected to the second control valve 503 through a pipeline, the deoxidizer 302 and the bypass valve 401 are physically connected to the converter 200 through a pipeline, and the controller 600 is connected to the NOx concentration sensor 602, the first oxygen concentration sensor 601, the second oxygen concentration sensor 603, the first control valve 301, the bypass valve 401, the second control valve 503, and the third control valve 504 through wires for electrical signal connections.

[0037] In the actual working process of the engine aftertreatment system of the embodiment of the present application, the combustion system burns a mixture of natural gas and air to form exhaust gas. Then it enters the detection component 600 through the exhaust manifold 101, and controls the opening of the bypass valve 401 and the first control valve 301 according to the parameters of the NOx concentration sensor 602 and the second oxygen concentration sensor 603 to control the oxygen partial pressure in the exhaust gas; finally, the exhaust gas enters the converter 200 to treat the tail gas. According to the parameters of the first oxygen concentration sensor 601, the bypass valve 401 is opened, and the crankcase ventilation system 501 allows the crankcase ventilation to react with the oxygen in the deoxidizer 302 to complete the regeneration of the deoxidizer carrier. If the first oxygen concentration sensor 601 is still over the limit after the crankcase ventilation is completely released, that is, the regeneration of the deoxidizer carrier is not completed, then the third control valve 504 is opened, and the natural gas in the gas tank is used to regenerate the deoxidizer carrier, and the working condition of the converter 200 remains unchanged.

[0038] In summary, the engine aftertreatment system of the embodiment of the present application can adjust the oxygen partial pressure before entering the converter through the precise control of the deoxidation component, thereby optimizing the conversion efficiency of the converter engine exhaust, and the regeneration component ensures that the deoxidizer carrier can be continuously regenerated, avoiding the system performance degradation caused by the deactivation of the deoxidizer, and extending the service life. The intelligent control strategy integrated in the controller reduces the overall volume and complexity of the system by real-time monitoring of the gas concentration and dynamically adjusting the opening of the bypass component, reducing the manufacturing and maintenance costs. As a result, the problems of low exhaust efficiency and high control difficulty of engine exhaust in the related technology are solved.

[0039] It should be noted that the deoxidizer carrier, three-way catalytic converter, sensor, crankcase ventilation system, gas tank, bypass valve and corresponding connection structure of the embodiment of the present application are not limited to specific forms, such as carrier shape, volume, mesh number, pore size, porosity, etc., coupled carrier or separate carrier, carrier catalyst formulation, crankcase ventilation, natural gas tank composition, shape and structure, system sensor shape and structure, bypass valve shape and structure, etc.; natural gas engine mode, such as engine cylinder number, airway injection or direct injection, spark plug ignition or pre-combustion chamber ignition and other factors. The converter catalyst can adopt a high noble metal content formula with more Pt and Pd to reduce the impact of CH4 on the oxidation durability of TWC. The deoxidizer carrier catalyst formula can adopt a cerium-zirconium solid solution with high oxygen storage capacity; the crankcase ventilation fuel amount can be greater than the deoxidizer carrier oxygen load to ensure that the deoxidizer carrier is fully regenerated. The pipeline in the system adopts a pipeline that has been insulated to avoid the exhaust temperature from dropping and affecting the catalyst efficiency.

[0040] Next, a control method for an engine aftertreatment system according to an embodiment of the present application will be described with reference to the accompanying drawings.

[0041] Figure 3 A flow chart of a control method for an engine aftertreatment system provided in an embodiment of the present application.

[0042] like Figure 3 As shown, the control method of the engine aftertreatment system includes the following steps:

[0043] In step S101, the air-fuel ratio of the engine and the first oxygen partial pressure after the deoxidizer carrier are obtained.

[0044] It is understandable that the embodiment of the present application can first determine whether the engine is started, and when the engine start signal is received, the air-fuel ratio (lambda value) of the engine mixture can be obtained. The lambda value is an indicator of the ratio of the air mass to the fuel mass in the engine combustion mixture, and the oxygen concentration sensor can be used to detect the first oxygen partial pressure P after the deoxidizer carrier.

[0045] In step S102 , a target operating condition of the engine aftertreatment system is determined according to the air-fuel ratio and the first oxygen partial pressure.

[0046] Among them, the target operating condition includes the first to third operating conditions, and the target operating condition of the engine aftertreatment system is determined according to the air-fuel ratio and the first oxygen partial pressure, including: if the air-fuel ratio is less than or equal to a preset value, the target operating condition is determined to be the first operating condition; if the air-fuel ratio is greater than the preset value and the first oxygen partial pressure is less than the partial pressure threshold, the target operating condition is determined to be the second operating condition; if the air-fuel ratio is greater than the preset value and the first oxygen partial pressure is greater than or equal to the partial pressure threshold, the target operating condition is determined to be the third operating condition.

[0047] The preset value can be set to 1. If the lambda value is greater than 1, it means that the mixture is lean. On the contrary, if the lambda value is less than 1, it means that the mixture is rich. The partial pressure threshold can be preset, such as P limit .

[0048] On the basis of the above embodiments, the present application can judge the working condition of the engine after-treatment system according to the lambda value and P. Specifically, when the mixed gas lambda=1, the engine after-treatment system can be in working condition; when the mixed gas lambda>1, and P <P limit When the engine aftertreatment system is in the second working condition, when the mixed gas lambda>1, and P≥P limit The engine aftertreatment system is in the third operating condition.

[0049] In step S103, the engine aftertreatment system is controlled to perform a target processing action according to the target operating condition.

[0050] In one embodiment of the present application, the engine aftertreatment system is controlled to perform a target processing action according to a target operating condition, including: if the target operating condition is a first operating condition, the bypass valve is controlled to be opened and the first to third control valves are closed; if the target operating condition is a second operating condition, when the second oxygen partial pressure is greater than the NOx partial pressure, the first control valve opening is controlled to increase, the bypass valve opening is controlled to decrease, and the second and third control valves are closed; when the second oxygen partial pressure is equal to the NOx partial pressure, the current openings of the first control valve and the bypass valve are controlled to remain unchanged, and the second and third control valves are closed; if the target operating condition is a third operating condition, when the second oxygen partial pressure is greater than the NOx partial pressure, the first control valve opening is controlled to be maximum, the second control valve opening is increased, and the bypass valve and the third control valve are closed; when the second oxygen partial pressure is equal to the NOx partial pressure, the first control valve opening is controlled to be maximum, the second control valve opening is controlled to remain unchanged, and the bypass valve and the third control valve are closed; when the second oxygen partial pressure is less than the NOx partial pressure, the first control valve opening is controlled to be maximum, the second control valve opening is controlled to decrease, and the bypass valve and the third control valve are closed.

[0051] Furthermore, after controlling the first control valve to open to the maximum, the second control valve to increase its opening, and the bypass valve and the third control valve to close, it also includes: identifying the current opening of the second control valve; if the current opening is the maximum opening, controlling the third control valve to open to the maximum.

[0052] Combine the following Figure 4 The specific working steps of the embodiment of the present application are described in detail, including the following steps:

[0053] Step 1: The engine start signal is sent to the signal processor to determine whether the engine is started. If the engine is started, step 2 is executed, otherwise the process ends.

[0054] Step 2: The controller determines the lambda value of the engine mixture. If lambda>1, the process proceeds to step 3. Otherwise, the process proceeds to the first operating condition, the bypass valve is controlled to open and the first to third control valves are controlled to close, and step 14 is executed.

[0055] Step 3: The controller collects the first oxygen partial pressure P of the first oxygen concentration sensor and compares it with the set oxygen concentration threshold P after the deoxidizer carrier. limit For comparison, if P <P limit , then enter the second operating condition and execute step 4, otherwise enter the regeneration operating condition and execute step 8;

[0056] Step 4: Under lean combustion conditions, the controller collects the second oxygen partial pressure P of the second oxygen concentration sensor. O2 and NOx partial pressure P of the NOx concentration sensor NOx , if P O2 >P NOx , then execute step 5. If P O2 =P NOx Then go to step 6. If P O2 <P NOx Then execute step 7;

[0057] Step 5: At this time, the oxygen partial pressure needs to be reduced to improve the conversion efficiency of the converter. At this time, the opening of the first control valve is increased, the opening of the bypass valve is reduced, the second and third control valves are closed, and then step 14 is executed;

[0058] Step 6: At this time, the oxygen partial pressure does not need to be changed, the openings of the bypass valve and the first control valve remain unchanged, the second and third control valves are closed, and then step 14 is executed;

[0059] Step 7: At this time, the oxygen partial pressure needs to be increased to improve the conversion efficiency of the converter. At this time, the opening of the first control valve is reduced, the opening of the bypass valve is increased, the second and third control valves are closed, and then step 14 is executed;

[0060] Step 8: Under the regeneration condition, the controller collects the second oxygen partial pressure P of the second oxygen concentration sensor. O2 and the NOx partial pressure P of the NOx concentration sensor 7 NOx , if P O2 >P NOx , then execute step 9. If P O2 =P NOx Then execute step 10. If P O2 <P NOx Then execute step 11;

[0061] Step 9: At this time, the oxygen partial pressure needs to be reduced to improve the conversion efficiency of the converter. At this time, the first control valve is controlled to have a maximum opening, the second control valve is increased in opening, the bypass valve and the third control valve are closed, and then step 12 is executed;

[0062] Step 10: At this time, there is no need to change the oxygen partial pressure, the first control valve is controlled to be opened to the maximum, the second control valve is controlled to be opened to the same degree, the bypass valve and the third control valve are closed, and then step 14 is executed;

[0063] Step 11: At this time, the oxygen partial pressure needs to be increased to improve the conversion efficiency of the converter 5. At this time, the first control valve is controlled to have a maximum opening, the second control valve is controlled to have a reduced opening, the bypass valve and the third control valve are closed, and then step 14 is executed;

[0064] Step 12: The controller collects the opening R of the second control valve. If the opening of the second control valve reaches the maximum, that is, R = R max , execute step 13, otherwise execute step 14; where R max It is a custom variable and can also be calibrated according to actual conditions.

[0065] Step 13: At this time, the enhanced regeneration condition is entered, the third control valve is opened to the maximum, and then step 8 is executed;

[0066] Step 14: Determine whether the engine is running. If the engine is running, execute step 2, otherwise end.

[0067] According to the control method of the engine aftertreatment system proposed in the embodiment of the present application, its working mode can be adjusted according to different working conditions to ensure that the best emission control effect can be provided under various driving conditions, which not only improves the emission control efficiency, but also takes into account the engine performance and economy.

[0068] In addition, an embodiment of the present application also provides a vehicle, including an engine after-treatment system as described in the above embodiment.

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0070] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0071] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0072] It should be understood that the various parts of the present application can be implemented in hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, the steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array, a field programmable gate array, etc.

[0073] A person of ordinary skill in the art may understand that all or part of the steps carried by the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the above-mentioned program may be stored in a computer-readable storage medium, which, when executed, includes one of the steps of the method embodiment or a combination thereof.

[0074] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An engine aftertreatment system, characterized in that: include: an engine and an exhaust manifold for said engine; A converter, wherein the exhaust manifold is connected to the converter via a main pipe; A deoxidation component, wherein the deoxidation component is arranged on the main pipe; A bypass assembly, wherein the bypass assembly is connected to the main pipeline, a first end of the bypass assembly is disposed between the exhaust manifold and the deoxidation assembly, and a second end of the bypass assembly is disposed between the deoxidation assembly and the converter; A regeneration component, used for regenerating the deoxidizer carrier in the deoxidation component; A detection component, used for detecting the gas concentration between the deoxidation component and the converter; A controller, wherein the controller is respectively connected to the deoxygenation component, the bypass component, the regeneration component and the detection component, and is used to control at least one of the deoxygenation component, the bypass component, the regeneration component and the detection component to process the engine exhaust according to the gas concentration detected by the detection component.

2. The engine aftertreatment system according to claim 1, characterized in that: The deoxidation component comprises a first control valve and a deoxidizer, wherein the control valve is used to control the opening and closing of the deoxidizer pipeline, and the deoxidizer is used to perform deoxidation treatment on the engine exhaust gas.

3. The engine aftertreatment system according to claim 2, characterized in that: The regeneration component includes a crankcase ventilation system, an air storage tank, a second control valve and a third control valve, wherein the second control valve is used to control the on-off of the pipeline between the crankcase ventilation system and the deoxidizer, and the third control valve is used to control the on-off of the pipeline between the air storage tank and the deoxidizer.

4. The engine aftertreatment system according to claim 2, characterized in that: The detection component includes a first oxygen concentration sensor, a second oxygen concentration sensor and a NOx concentration sensor, wherein the first oxygen concentration sensor is arranged on the pipeline between the deoxidizer and the second end, the second oxygen concentration sensor and the NOx concentration sensor are arranged on the pipeline between the second end and the converter, the first oxygen concentration sensor is used to detect a first oxygen partial pressure after the deoxidizer carrier, the second oxygen concentration sensor is used to detect a second oxygen partial pressure on the main pipe after the second end point, and the first oxygen concentration sensor is used for the NOx partial pressure on the main pipe after the second end point.

5. The engine aftertreatment system according to claim 1, characterized in that: The bypass assembly includes a bypass pipeline and a bypass valve arranged on the bypass pipeline, wherein the bypass valve is used to control the opening and closing of the bypass pipeline.

6. A vehicle, characterized in that: An engine after-treatment system comprising any one of claims 1-5.

7. A control method for an engine aftertreatment system, characterized in that: The method is used for controlling the engine aftertreatment system according to any one of claims 1 to 5, wherein the method comprises the following steps: Acquiring the air-fuel ratio of the engine and the first oxygen partial pressure after the deoxidizer carrier; determining a target operating condition of the engine aftertreatment system according to the air-fuel ratio and the first oxygen partial pressure; The engine aftertreatment system is controlled to perform a target processing action according to the target operating condition.

8. The control method of the engine aftertreatment system according to claim 7, characterized in that: The target operating conditions include first to third operating conditions, and determining the target operating condition of the engine aftertreatment system according to the air-fuel ratio and the first oxygen partial pressure includes: If the air-fuel ratio is less than or equal to a preset value, determining the target operating condition to be a first operating condition; If the air-fuel ratio is greater than the preset value and the first oxygen partial pressure is less than a partial pressure threshold, determining that the target operating condition is the second operating condition; If the air-fuel ratio is greater than the preset value and the first oxygen partial pressure is greater than or equal to the partial pressure threshold, the target operating condition is determined to be the third operating condition.

9. The control method of the engine aftertreatment system according to claim 8, characterized in that: The controlling the engine after-treatment system to perform a target processing action according to the target operating condition includes: If the target operating condition is the first operating condition, the bypass valve is controlled to be opened and the first to third control valves are controlled to be closed; If the target operating condition is the second operating condition, then when the second oxygen partial pressure is greater than the NOx partial pressure, the first control valve opening is controlled to increase, the bypass valve opening is controlled to decrease, and the second and third control valves are closed; when the second oxygen partial pressure is equal to the NOx partial pressure, the current openings of the first control valve and the bypass valve are controlled to remain unchanged, and the second and third control valves are controlled to close; If the target operating condition is the third operating condition, then when the second oxygen partial pressure is greater than the NOx partial pressure, the first control valve is controlled to have a maximum opening, the second control valve opening is increased, and the bypass valve and the third control valve are closed; when the second oxygen partial pressure is equal to the NOx partial pressure, the first control valve is controlled to have a maximum opening, the second control valve opening is unchanged, and the bypass valve and the third control valve are closed; when the second oxygen partial pressure is less than and equal to the NOx partial pressure, the first control valve is controlled to have a maximum opening, the second control valve opening is reduced, and the bypass valve and the third control valve are closed.

10. The control method of the engine aftertreatment system according to claim 9, characterized in that: After controlling the first control valve to have a maximum opening, the second control valve to have an increased opening, and the bypass valve and the third control valve to be closed, the method further includes: identifying a current opening of the second control valve; If the current opening is the maximum opening, the opening of the third control valve is controlled to be maximum.

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