Exhaust treatment system, exhaust treatment method, controller, storage medium and vehicle

Abstract

The invention discloses an exhaust treatment system, an exhaust treatment method, a controller, a storage medium and a vehicle, and the exhaust treatment system comprises an air inlet pipeline used for being connected with an air inlet valve of an engine; the exhaust pipeline is used for being connected with an exhaust valve of the engine; the electronic supercharger is arranged in the air inlet pipeline; the electric heating catalytic converter is arranged in the exhaust pipeline; the electric variable valve timing system is used for a valve mechanism arranged on an engine; the control module is connected with the electronic supercharger, the electric heating catalytic converter and the electric variable valve timing system and used for detecting the crankshaft phase of the engine in the shutdown state. And according to the crankshaft phase, the electric variable valve timing system is controlled, the opening time sequence of the intake valve and the exhaust valve is adjusted, and a preset valve overlapping angle is formed, so that the flow speed of exhaust flowing to the electric heating catalytic converter is increased through the valve overlapping angle under the action of the electronic supercharger, and a catalyst in the electric heating catalytic converter reaches the working temperature. And emission of harmful gas is reduced.

Description

Technical Field

[0001] The present invention relates to the field of exhaust gas treatment, and in particular to an exhaust gas treatment system, an exhaust gas treatment method, a controller, a storage medium and a vehicle. Background Art

[0002] In modern cars, catalysts are essential for reducing exhaust emissions. However, during the cold start phase of the engine, the catalyst is at a low temperature and cannot immediately and effectively catalytically convert pollutants, resulting in large amounts of harmful substances (such as carbon monoxide, nitrogen oxides and hydrocarbons) being emitted.

[0003] Existing solutions mainly rely on the catalyst ignition conditions set during the engine performance development process, using exhaust heat to naturally heat the catalyst. However, this process responds slowly and places high demands on the engine exhaust heat flux, especially at low speed and low load conditions, which can easily lead to high noise, vibration and harshness (NVH) problems.

[0004] Therefore, how to make the catalyst quickly reach the operating temperature after the vehicle is started and reduce harmful gas emissions has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] Embodiments of the present invention provide an exhaust gas treatment system, an exhaust gas treatment method, a controller, a storage medium and a vehicle to solve the technical problem that the catalyst of the existing vehicle cannot quickly reach the operating temperature after starting, resulting in high emission of harmful gases.

[0006] In a first aspect, an exhaust gas treatment system is provided, the exhaust gas treatment system comprising: An intake pipe, used to be connected to an intake valve of an engine; An exhaust pipe, used to be connected to an exhaust valve of the engine; An electronic supercharger, arranged in the intake pipe; An electrically heated catalyst is arranged in the exhaust pipe; An electric variable valve timing system, for being provided in a valve mechanism of the engine; A control module is connected to the electronic supercharger, the electric heating catalyst and the electric variable valve timing system, respectively, and is used for: detecting a crankshaft phase of the engine in a stopped state; According to the crankshaft phase, the electric variable valve timing system is controlled to adjust the opening timing of the intake valve and the exhaust valve to form a preset valve overlap angle, so that under the action of the electronic supercharger, the valve overlap angle is utilized to increase the exhaust flow rate to the electrically heated catalyst, so that the catalyst inside the electrically heated catalyst reaches the operating temperature.

[0007] In one embodiment, the electrically variable valve timing system includes an electrically variable intake valve timing system and an electrically variable exhaust valve timing system; The electrically variable intake valve timing system and the electrically variable exhaust valve timing system are both arranged in the valve mechanism.

[0008] In one embodiment, the exhaust gas treatment system further comprises: A post-processing module, arranged in the exhaust pipe, for further purifying the exhaust gas after being processed by the electric heating catalyst; a muffler, arranged in the exhaust pipe; Wherein, the electrically heated catalyst, the post-processing module and the muffler are arranged in sequence along the exhaust direction.

[0009] In one embodiment, the exhaust gas treatment system further comprises: an exhaust bypass pipeline connected to the exhaust pipeline, and an inlet of the exhaust bypass pipeline is arranged between the post-processing module and the muffler; The electronic valve is arranged in the exhaust bypass pipeline.

[0010] In a second aspect, an exhaust gas treatment method is provided, which is applied to the exhaust gas treatment system described in the first aspect, and the method comprises: Detect the crankshaft phase of the engine when it is stopped; According to the crankshaft phase, the electric variable valve timing system is controlled to adjust the opening timing of the intake valve and the exhaust valve to form a preset valve overlap angle, so that under the action of the electronic supercharger, the valve overlap angle is utilized to increase the exhaust flow rate to the electrically heated catalyst, so that the catalyst inside the electrically heated catalyst reaches the operating temperature.

[0011] In one embodiment, after controlling the electric variable valve timing system according to the crankshaft phase to adjust the opening timing of the intake valve and the exhaust valve, the method includes: Get ambient temperature, exhaust back pressure and exhaust temperature; Dynamically adjusting the opening of the electronic valve according to the ambient temperature, the valve overlap angle and the exhaust back pressure so as to maintain the exhaust back pressure within a target range; dynamically adjusting the power of the electrically heated catalyst according to the ambient temperature, the valve overlap angle, the exhaust back pressure and the exhaust temperature; The valve overlap angle and / or the power of the electronic supercharger are dynamically adjusted according to the ambient temperature.

[0012] In one embodiment, dynamically adjusting the valve overlap angle and / or the power of the electronic supercharger according to the ambient temperature includes: When the ambient temperature is within a first preset temperature range, adjusting the valve overlap angle according to a first preset overlap angle adjustment value, and / or adjusting the power of the electronic supercharger according to a first preset power adjustment value; When the ambient temperature is within a second preset temperature range, adjusting the valve overlap angle according to a second preset overlap angle adjustment value, and / or adjusting the power of the electronic supercharger according to a second preset power adjustment value; When the ambient temperature is within a third preset temperature range, the valve overlap angle is adjusted according to a third preset overlap angle adjustment value, and / or the power of the electronic supercharger is adjusted according to a third preset power adjustment value.

[0013] In a third aspect, a controller is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the exhaust treatment method described in the second aspect when executing the computer program.

[0014] In a fourth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the exhaust gas treatment method described in the second aspect is implemented.

[0015] In a fifth aspect, a vehicle is provided, wherein the vehicle includes the exhaust gas treatment system described in the first aspect, or the vehicle includes the controller described in the third aspect.

[0016] In one solution implemented by the above-mentioned exhaust treatment system, exhaust treatment method, controller, storage medium and vehicle, an electronic supercharger is set in the intake pipe, an electric heating catalyst is set in the exhaust pipe, and the electric variable valve timing system and the control module are combined for coordinated control, so that the control module can control the electric variable valve timing system by detecting the crankshaft phase when the engine is stopped, adjust the opening timing of the intake valve and the exhaust valve, form a preset valve overlap angle, and under the action of the electronic supercharger, the valve overlap angle is used to enable the exhaust gas to quickly and effectively enter the exhaust pipe and the electric heating catalyst, so that the electric heating catalyst can quickly increase the temperature of the internal catalyst, shorten the lag time of exhaust purification, improve the catalyst working efficiency during the cold start stage of the engine, effectively reduce the harmful gas emissions during the cold start stage of the engine, and improve the noise, vibration and harshness (NVH) performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 is a system schematic diagram of an exhaust gas treatment system in one embodiment of the present application; Figure 2 is a flow chart of an exhaust gas treatment method in one embodiment of the present application; Figure 3 It is a structural diagram of a controller in one embodiment of the present application.

[0019] Among them, the reference numerals in the figure are: 1-intake pipe, 2-electronic supercharger, 3-electric variable intake valve timing system, 4-engine, 5-electric variable exhaust valve timing system, 6-electric heated catalyst, 7-after-treatment module, 8-exhaust pipe, 9-exhaust bypass pipe, 10-electronic valve, 11-control module, 12-muffler. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0022] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] 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 the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] Please also read Figures 1 to 3 The exhaust gas treatment system, exhaust gas treatment method, controller, storage medium and vehicle provided by the embodiments of the present invention are now described. For ease of understanding, the above aspects are described one by one below.

[0025] A. Exhaust treatment system In one embodiment, if Figure 1 As shown, an exhaust treatment system is provided, which includes an intake pipe 1, an exhaust pipe 8, an electronic supercharger 2 (EHC), an electric variable valve timing system (VVT) and a control module 11. Specifically, one end of the intake pipe 1 is connected to the intake valve of the engine 4, and one end of the exhaust pipe 8 is connected to the exhaust valve of the engine 4; the electronic supercharger 2 is arranged in the intake pipe 1 to increase the intake pressure; the electric heating catalyst 6 is arranged in the exhaust pipe 8 to increase the working temperature of the catalyst by heating the exhaust gas; the electric variable valve timing system is arranged in the valve structure of the engine 4 to control the opening and closing timing of the intake valve and exhaust valve of the engine 4; the control module 11 is respectively connected to the electronic supercharger 2, the electric heating catalyst 6 and the electric variable valve timing system, and is used to coordinately control the electronic supercharger 2, the electric heating catalyst 6 and the electric variable valve timing system, so that the exhaust gas can flow into the combustion chamber of the engine 4 in a timely and smooth manner, and enter the electric heating catalyst 6 through the exhaust valve for heating treatment.

[0026] It can be seen from this embodiment that after the vehicle is started, the control module 11 of the present application detects the crankshaft phase of the engine 4 in the shutdown state, and controls the electric variable valve timing system according to the detected crankshaft phase, adjusts the opening timing of the intake valve and the exhaust valve, and forms a preset valve overlap angle, ensuring that during the exhaust process, the intake valve and the exhaust valve have a certain overlapping period, that is, when the intake valve is opened, the exhaust valve is not closed, and under the action of the electronic supercharger 2, the valve overlap angle is used to enable the exhaust gas to enter the electric heating catalyst 6 in time for heating treatment, and further enable the catalyst inside the electric heating catalyst 6 to reach the ignition temperature earlier, thereby promoting the efficient operation of the catalyst, thereby shortening the heating time of the catalyst, thereby improving the efficiency of exhaust post-treatment and reducing harmful emissions.

[0027] In one embodiment, the electronic supercharger 2 can be fixed in the intake pipe 1 by flanges, bolts or welding, and the electric heating catalyst 6 can also be fixed in the exhaust pipe 8 by flanges, bolts or welding, which does not constitute a limitation of the present invention.

[0028] In one embodiment, a gear mechanism is provided outside the valve structure, and the gear mechanism is used to connect with the valve drive device. The valve drive device includes an actuator and a drive gear, and the actuator is connected with the drive gear. As an example, the electric variable valve timing system can be directly assembled in the valve mechanism of the engine 4 and located above the cylinder head. The electric variable valve timing system can control the actuator in the valve drive device through the gear structure outside the valve structure, so that the actuator drives the gear, thereby adjusting the opening and closing timing of the intake valve and the exhaust valve.

[0029] In one embodiment, the electric heating catalyst 6 includes an electric heating element and a catalyst material layer, and the catalyst material layer is arranged behind the electric heating element. The function of the electric heating element is to uniformly heat the exhaust gas and increase the temperature of the exhaust gas to reach the temperature range required for the catalyst reaction; the catalyst material layer is coated with a precious metal catalyst, such as platinum, palladium and rhodium, etc. These precious metal catalysts can effectively promote the chemical reaction of harmful substances such as carbon monoxide, hydrocarbons and nitrogen oxides, and convert them into harmless carbon dioxide, water and nitrogen, etc., so as to reduce the content of pollutants in the exhaust gas.

[0030] In one embodiment, the electric variable valve timing system includes an electric variable intake valve timing system 3 and an electric variable exhaust valve timing system 5; the electric variable intake valve timing system 3 and the electric variable exhaust valve timing system 5 are both arranged in the valve mechanism. The electric variable intake valve timing system 3 is used to control the opening and closing timing of the intake valve; the electric variable exhaust valve timing system 5 is used to control the opening and closing timing of the exhaust valve.

[0031] Preferably, when the engine 4 is cold-started, the opening and closing timing of the intake valve and the exhaust valve can be adjusted through the coordinated action of the electric variable intake valve timing system 3 and the electric variable exhaust valve timing system 5, so that the intake valve and the exhaust valve are overlapped, the airflow management is optimized, and it is ensured that the heated exhaust gas can be quickly blown to the catalyst material layer of the electric heating catalyst 6, thereby shortening the heating time of the catalyst.

[0032] In one embodiment, the exhaust treatment system also includes a post-processing module 7 and a muffler 12, wherein the post-processing module 7 and the muffler 12 are both arranged in the exhaust pipe 8 and are arranged in sequence according to the exhaust direction, and the post-processing module 7 is installed after the electric heating catalyst 6, aiming to further purify the exhaust gas treated by the electric heating catalyst 6 to ensure compliance with emission standards, and the muffler 12 is installed after the post-processing module 7 to reduce the noise of the exhaust system and improve the quietness of the vehicle. Preferably, the post-processing module 7 and the muffler 12 can be fixed in the exhaust pipe 8 by flanges, bolts or welding, which does not constitute a limitation of the present invention.

[0033] Through this setting, the exhaust treatment system can effectively optimize exhaust treatment and noise control, further improving the vehicle's environmental performance and driving comfort.

[0034] In one embodiment, the post-processing module 7 includes one or more other types of catalysts, such as a three-way catalyst, a SCR catalyst, a urea injection device and / or a particulate filter (DPF), etc. Preferably, after the exhaust gas is preliminarily treated by the catalyst material layer in the electrically heated catalyst 6, pollutants such as nitrogen oxides (NOx), hydrocarbons (HC) and carbon monoxide (CO) in the exhaust gas have been preliminarily removed, and a particulate filter can be further selected to effectively remove solid particulate matter (PM) in the exhaust gas to meet more stringent emission standards, or a three-way catalyst can be selected to further process and purify the exhaust gas to further remove harmful substances such as nitrogen oxides, hydrocarbons and carbon monoxide. This is only used as an example here, and the specific selection can be made according to actual needs, and does not constitute a limitation of the present invention.

[0035] It can be understood that through this two-stage purification method, the exhaust treatment system can provide a more efficient purification effect, significantly reduce the emission of harmful pollutants in the exhaust gas, further improve the environmental performance of the vehicle, and help protect the environmental air quality.

[0036] In one embodiment, the exhaust treatment system further includes an exhaust bypass pipeline 9 and an electronic valve 10, the exhaust bypass pipeline 9 is connected to the exhaust pipeline 8, and the inlet of the exhaust bypass pipeline 9 is arranged between the post-processing module 7 and the muffler 12, and the electronic valve 10 is arranged in the exhaust bypass pipeline 9. Preferably, the electronic valve 10 can be fixed in the exhaust bypass pipeline 9 by flange, bolts or welding, and is used to control the exhaust flow rate, so that part of the exhaust gas can bypass the muffler 12 and be discharged directly through the exhaust bypass pipeline 9, thereby effectively reducing the exhaust back pressure, and enhancing the pressure difference between the intake and exhaust, and further improving the scavenging effect of the engine 4, which is only used as an example here and does not constitute a limitation.

[0037] It can be understood that since the exhaust resistance of the muffler 12 is relatively large, by setting up an exhaust bypass line 9 and setting up an electronic valve 10 in the exhaust bypass line 9, it is possible to reduce exhaust back pressure while ensuring emission control, so that the engine 4 can run more smoothly, improve the performance of the engine 4, and help reduce the burden on the exhaust treatment system, improve the responsiveness of the engine 4, and at the same time ensure that the vehicle optimizes power output while meeting emission standards and can reduce energy consumption.

[0038] In one embodiment, the electronic valve 10 includes a butterfly valve or a lift valve, and the specific one can be selected according to actual needs and is not limited here. In one embodiment, the electronic supercharger 2 includes an electric motor and a compressor, wherein the electric motor is connected to the compressor. Preferably, the electric motor can be connected to the compressor through a rigid coupling to ensure that the impeller of the compressor can rotate stably and at high speed, so that air can be smoothly sucked in and compressed.

[0039] It can be understood that connecting the electric motor and the compressor through a rigid coupling can reduce losses and fluctuations in the power transmission process, ensure that the electronic supercharger 2 maintains an efficient and stable working state during operation, and continuously and stably provides boosted intake air to the engine 4, effectively improving the reliability and boosting effect of the exhaust treatment system, especially under high load and dynamic conditions, and can maintain the stability of the boosting performance.

[0040] In one embodiment, the intake pipe 1, the exhaust pipe 8 and the exhaust bypass pipe 9 can all be set as long tubular structures or other shapes. Specifically, the shape and length of these pipes can be adjusted according to the overall design, spatial layout and performance requirements of the vehicle to achieve the best fluid channel and exhaust path, which does not constitute a limitation of the present invention.

[0041] It can be understood that the materials of the intake pipe 1, the exhaust pipe 8 and the exhaust bypass pipe 9 can be corrosion-resistant and high-temperature materials, such as stainless steel, high-temperature resistant alloys and coating materials, so as to ensure that during long-term use, they can effectively resist the erosion of corrosive components in the exhaust gas and high-temperature gases, thereby ensuring the reliable operation and durability of the exhaust treatment system and the entire vehicle.

[0042] In one embodiment, the control module 11 includes a first communication port, a second communication port, a third communication port, a fourth communication port and a fifth communication port. Specifically, the first communication port is connected to the electronic supercharger 2, and is used to control the electronic supercharger 2 to adjust the intake pressure; the second communication port is connected to the electric heating catalyst 6, and is used to adjust the heating power of the electric heating catalyst 6, so as to quickly increase the working temperature of the catalyst; the third communication port is respectively connected to the electric variable intake valve timing system 3 and the electric variable exhaust valve timing system 5, and is used to control the opening sequence of the intake valve and the exhaust valve, so as to form a preset valve overlap angle; the fourth communication port is connected to the post-processing module 7, and is used to control the working state of the post-processing module 7; the fifth communication port is connected to the electronic valve 10, and is used to control the electronic valve 10 to adjust the flow of the exhaust bypass pipeline 9.

[0043] It can be seen from this embodiment that, through the coordination of these communication ports, the control module 11 can achieve precise control of various components of the exhaust treatment system, ensuring efficient operation of the exhaust treatment system under different working conditions.

[0044] It should be understood that the control module 11 in the present invention may also be connected to the above modules in a wireless manner, which does not constitute a limitation of the present invention.

[0045] In summary, in a solution provided by an embodiment of the present invention, an electronic supercharger 2 is provided in the intake pipe 1, an electric heating catalyst 6, a post-treatment module 7 and a muffler 12 are provided in the exhaust pipe 8, an electronic valve 10 is provided in the exhaust bypass pipe 9, and the electric variable valve timing system and the coordinated control of the control module 11 are combined, so that the control module 11 can control the electric variable valve timing system by detecting the crankshaft phase of the engine 4 when it is stopped, adjust the opening timing of the intake valve and the exhaust valve, form a preset valve overlap angle, and enable the exhaust gas to quickly and effectively enter the exhaust pipe 8 and the electric heating catalyst 6 under the action of the electronic supercharger 2, so that the electric heating catalyst 6 can quickly increase the temperature of the internal catalyst, shorten the lag time of exhaust purification, improve the catalyst working efficiency in the cold start stage of the engine 4, effectively reduce the harmful gas emissions in the cold start stage of the engine 4, and improve the noise, vibration and harshness (NVH) performance. And under the action of the electronic valve 10, a large amount of exhaust gas is discharged through the exhaust bypass pipe 9 instead of the muffler 12, the exhaust back pressure is reduced, the intake and exhaust pressure difference is increased, the purging effect is enhanced, the fuel consumption is effectively reduced, and the emission control effect and fuel economy are comprehensively improved.

[0046] B. Exhaust treatment method As described in the above section A, an embodiment of the present application provides an exhaust gas treatment system. Based on the exhaust gas treatment system, a corresponding exhaust gas treatment method is provided, which is described in detail below.

[0047] In one embodiment, if Figure 2 As shown, an exhaust gas treatment method is provided, comprising the following steps: S10: Detect the crankshaft phase of the engine when it is stopped.

[0048] It can be understood that the crankshaft phase refers to the specific position and corresponding angle information of the engine crankshaft during its rotation, reflecting the stroke state of the piston in the cylinder.

[0049] As an example, after the vehicle is started, the crankshaft phase of the engine 4 in the stopped state can be detected by a sensor. For example, a high-precision Hall effect sensor is used to accurately capture the rotation angle of the crankshaft, thereby determining the crankshaft phase in the engine stopped state.

[0050] S20. According to the crankshaft phase, the electric variable valve timing system is controlled to adjust the opening timing of the intake valve and the exhaust valve to form a preset valve overlap angle, so as to increase the exhaust flow rate to the electrically heated catalyst by utilizing the valve overlap angle under the action of the electronic supercharger, so that the catalyst inside the electrically heated catalyst reaches the operating temperature.

[0051] As an example, after obtaining the crankshaft phase of the engine 4, since the crankshaft phase is closely related to the working condition of the engine 4, the current operating condition of the engine 4 can be inferred from it. Subsequently, the control module 11 sends a control instruction to the electric variable valve timing system according to the obtained crankshaft phase. After receiving the instruction, the electric variable valve timing system adjusts the opening timing of the intake valve and the exhaust valve so that the valve overlap angle reaches a preset value. Further, under the action of the electronic supercharger 2, the valve overlap angle is used to increase the exhaust flow rate to the electric heating catalyst 6, so that the catalyst inside the electric heating catalyst 6 can quickly reach the working temperature.

[0052] It can be seen from this embodiment that by adjusting the valve overlap angle, the flow characteristics of the exhaust gas can be effectively optimized. On the one hand, this adjustment can ensure that the exhaust gas can quickly and effectively enter the electrically heated catalyst 6 for subsequent treatment, thereby reducing harmful emissions. On the other hand, this adjustment can improve the emission efficiency of the residual gas in the cylinder of the engine 4 and the intake efficiency of fresh air, thereby improving the combustion performance of the engine 4.

[0053] It should be understood that by detecting the crankshaft phase when the engine 4 is stopped and then adjusting the valve overlap angle according to the crankshaft phase, compared with traditional general intake or exhaust optimization methods, it is more targeted and dynamically adaptable, so that the fuel and air are mixed more fully and the combustion is more efficient, which not only improves power output but also effectively reduces pollutant emissions. For example, assuming that the control module 11 detects that the crankshaft phase is 20°, based on this crankshaft phase, the control module 11 sends an adjustment instruction to the electric variable valve timing system. For example, the instruction is to open the intake valve when the crankshaft phase reaches 25°, and delay the exhaust valve to close when the crankshaft phase reaches 30°, thereby forming a valve overlap angle of 5°.

[0054] It should be understood that the valve overlap angle can be dynamically adjusted according to environmental conditions and engine 4 performance requirements. For example, during low-temperature starting, a larger valve overlap angle can be set to improve the gas flow performance of the engine 4 combustion chamber and accelerate the increase in exhaust temperature, thereby effectively reducing the emission of pollutants during the cold start process. This does not constitute a limitation of the present invention.

[0055] In one embodiment, after step S20, that is, after controlling the electric variable valve timing system according to the crankshaft phase to adjust the opening timing of the intake valve and the exhaust valve, the following steps are included: S30, obtaining ambient temperature, exhaust back pressure and exhaust temperature; S40, dynamically adjusting the opening of the electronic valve according to the ambient temperature, the valve overlap angle and the exhaust back pressure, so that the exhaust back pressure is maintained within a target range; S50, dynamically adjusting the power of the electrically heated catalyst according to the ambient temperature, the valve overlap angle, the exhaust back pressure and the exhaust temperature; S70: Dynamically adjust the valve overlap angle and / or the power of the electronic supercharger according to the ambient temperature.

[0056] In this embodiment, the ambient temperature refers to the temperature of the atmosphere surrounding the vehicle, which can be collected by an external temperature sensor on the vehicle; Exhaust back pressure refers to the reverse pressure generated by the resistance encountered by exhaust gas during the exhaust process, which can be collected by a preset pressure sensor, wherein the pressure sensor can be set before the muffler 12 or at other locations; The exhaust temperature refers to the temperature when it is discharged from the exhaust port of the exhaust pipe 8 or the exhaust bypass pipe 9, which can be collected by a preset temperature sensor, wherein the temperature sensor can be set at the exhaust port of the exhaust pipe 8 or the exhaust bypass pipe 9, which does not constitute a limitation here.

[0057] As an example, after acquiring the data in step S10, the control module 11 performs dynamic calculations based on the current ambient temperature, valve overlap angle and exhaust back pressure in combination with a preset algorithm, and then adjusts the opening of the electronic valve 10 in real time to maintain the exhaust back pressure within a target range, such as between 0.8 bar and 1.2 bar, thereby optimizing the exhaust flow characteristics and avoiding excessive or low exhaust back pressure from adversely affecting the performance of the engine 4 and the working efficiency of the electrically heated catalyst 6. For example, when the exhaust back pressure exceeds 1.2 bar, the control module 11 controls the opening angle of the electronic valve 10 to increase, increase the exhaust bypass volume, and thus reduce the back pressure.

[0058] Furthermore, the power of the electrically heated catalyst 6 is dynamically adjusted according to the ambient temperature, valve overlap angle, exhaust back pressure and exhaust temperature. For example, when the ambient temperature is low (e.g., below 0°C) and the exhaust temperature is not high enough to meet the working temperature of the catalyst, the control module 11 will increase the power of the electrically heated catalyst 6, for example, from 500W to 1000W, so as to quickly heat up to the ignition temperature of the catalyst (e.g., 250°C), thereby ensuring the emission performance of the exhaust treatment system under cold start conditions; if the ambient temperature is high or the exhaust temperature has reached the working temperature range of the catalyst, the power of the electrically heated catalyst 6 can be reduced to save energy.

[0059] Furthermore, the valve overlap angle and / or the power of the electronic supercharger 2 can be dynamically adjusted according to the ambient temperature. For example, when the ambient temperature is low, the valve overlap angle and / or the power of the electronic supercharger 2 can be increased to increase the flow velocity of the exhaust gas, thereby improving the efficiency of the exhaust gas heated by the electric heating element to be quickly purged to the catalyst material layer, so that the catalyst can reach the operating temperature faster. Conversely, when the ambient temperature is high, for example, exceeding 30°C, the control module 11 can reduce the valve overlap angle to avoid excessive exhaust gas backflow from having a negative impact on the performance of the engine 4, and at the same time, the power of the electronic supercharger 2 can be reduced to save energy.

[0060] This embodiment realizes dynamic optimization control of the opening of the electronic valve 10, the power of the electric heating catalyst 6, the valve overlap angle and the power of the electronic supercharger 2 by combining real-time operating parameters such as ambient temperature, exhaust back pressure, valve overlap angle, exhaust temperature, etc., which not only improves the efficiency of the exhaust treatment system and reduces harmful emissions, but also takes into account the balance between energy consumption and emission performance, which is a significant improvement.

[0061] For example, assuming that the vehicle is started in an environment of 20°C, the control module 11 first detects that the ambient temperature is low, while the exhaust temperature is only 100°C and the back pressure is 1.3 bar. At this time, the control module 11 adjusts the valve overlap angle to 20° according to the preset algorithm to enhance the exhaust efficiency, and opens the electronic valve 10 appropriately to reduce the exhaust back pressure to the target range of 1.0 bar. Subsequently, the power of the electrically heated catalyst 6 can be increased from the default 600W to 1200W, so that it can be quickly heated to 300°C in a short time, thereby ensuring that the catalyst can enter the working temperature as soon as possible. At the same time, the power of the electronic supercharger 2 is increased from 60% to 80% of the rated power, and the intake pressure is enhanced to improve the purge efficiency, further promoting the catalyst to enter the working temperature as soon as possible. Through the above dynamic adjustment, the vehicle meets the power demand and reduces harmful emissions during the cold start process. It should be understood that the above is only an example and does not constitute a limitation.

[0062] In one embodiment, step S70, i.e. dynamically adjusting the valve overlap angle and / or the power of the electronic supercharger 2 according to the ambient temperature, includes the following steps: S71, when the ambient temperature is within a first preset temperature range, adjusting the valve overlap angle according to a first preset overlap angle adjustment value, and / or adjusting the power of the electronic supercharger according to a first preset power adjustment value; S72, when the ambient temperature is within a second preset temperature range, adjusting the valve overlap angle according to a second preset overlap angle adjustment value, and / or adjusting the power of the electronic supercharger according to a second preset power adjustment value; S73: When the ambient temperature is within a third preset temperature range, adjusting the valve overlap angle according to a third preset overlap angle adjustment value, and / or adjusting the power of the electronic supercharger according to a third preset power adjustment value.

[0063] As an example, when it is detected that the ambient temperature is in a first preset temperature range (for example, below 0°C), the control module 11 will adjust the valve overlap angle according to the first preset overlap angle adjustment value, for example, increase the valve overlap angle according to the 10° overlap angle adjustment value to maintain the valve overlap angle within the first target valve overlap angle range (for example, 15°C to 25°C); at the same time, the control module 11 increases the power of the electronic supercharger 2 according to the first preset power adjustment value, increases the intake volume to compensate for the decrease in intake efficiency due to the increase in the valve overlap angle, and ensures that the output power of the engine 4 meets the demand.

[0064] When the ambient temperature is in a second preset temperature range (e.g., 0°C to 23°C), the control module 11 adjusts the valve overlap angle according to a second preset overlap angle adjustment value, for example, increasing the valve overlap angle according to a 5° overlap angle adjustment value to maintain the valve overlap angle within a second target valve overlap angle range (e.g., 5°C to 10°C); at the same time, the power of the electronic supercharger 2 is appropriately adjusted according to the second preset power adjustment value to maintain the fuel economy and stability of the engine 4.

[0065] When the ambient temperature is in the third preset temperature range (for example, above 23°C), the control module 11 will adjust the valve overlap angle according to the third preset overlap angle adjustment value, and reduce the valve overlap angle according to the 5° overlap angle adjustment value to maintain the valve overlap angle within the third target valve overlap angle range (for example, 5°C to 10°C) to reduce the amount of residual exhaust gas in the cylinder of the engine 4 and avoid excessive combustion temperature causing heat load to the engine 4; at the same time, the power of the electronic supercharger 2 is adjusted according to the third preset power adjustment value to reduce power consumption and optimize the economy of the operation of the engine 4.

[0066] Through this dynamic adjustment strategy based on temperature range, the control module 11 realizes the coordinated optimization of the valve overlap angle and the power of the electronic supercharger 2, so that the engine 4 can maintain the best emission treatment effect and operating performance under different temperature environments. The above is only an adjustment scheme and does not constitute a limitation of the present invention.

[0067] In summary, the following is a complete example based on steps S10-S70: The control module 11 first detects the crankshaft phase of the engine 4 in the shutdown state, and controls the electric variable valve timing system according to the crankshaft phase, adjusts the opening sequence of the intake valve and the exhaust valve, thereby forming a preset valve overlap angle and optimizing the exhaust gas flow. Subsequently, according to the change of the ambient temperature, the control module 11 adjusts the valve overlap angle and controls the power of the electronic supercharger 2. At the same time, the control module 11 also monitors the exhaust back pressure and exhaust temperature in real time, and adjusts the opening of the electronic valve 10 and the power of the electric heating catalyst 6, so that the control module 11 can coordinately control the working state of the electric variable valve timing system, the electronic supercharger 2, the electric heating catalyst 6, the post-processing module 7 and the electronic valve 10, optimize the exhaust treatment effect, and ensure that the exhaust treatment system can operate efficiently under various working conditions, especially when the exhaust temperature can be quickly increased during cold start, and the working state of the catalyst is optimized.

[0068] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0069] C. Controller In one embodiment, a controller is provided. The controller may be a server, and its internal structure diagram may be as follows: Figure 3 As shown. The controller includes a processor, a memory, and a network interface connected through a system bus. Among them, the processor of the controller is used to provide computing and control capabilities. The memory of the controller includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the controller is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, an exhaust treatment method is implemented.

[0070] In one embodiment, a controller is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the following steps when executing the computer program: Detect the crankshaft phase of the engine when it is stopped; According to the crankshaft phase, the electric variable valve timing system is controlled to adjust the opening timing of the intake valve and the exhaust valve to form a preset valve overlap angle, so that under the action of the electronic supercharger, the valve overlap angle is utilized to increase the exhaust flow rate to the electrically heated catalyst, so that the catalyst inside the electrically heated catalyst reaches the operating temperature.

[0071] D. Computer readable storage medium In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented: Detect the crankshaft phase of the engine when it is stopped; According to the crankshaft phase, the electric variable valve timing system is controlled to adjust the opening timing of the intake valve and the exhaust valve to form a preset valve overlap angle, so that under the action of the electronic supercharger, the valve overlap angle is utilized to increase the exhaust flow rate to the electrically heated catalyst, so that the catalyst inside the electrically heated catalyst reaches the operating temperature.

[0072] It should be noted that for more functions or steps implemented by the controller in the aforementioned part C and the computer storage medium in the aforementioned part D, as well as the technical effects brought about, please refer to the description of the aforementioned method embodiment. In order to avoid repetition, they will not be repeated here.

[0073] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0074] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0075] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. An exhaust gas treatment system, characterized in that: The exhaust gas treatment system comprises: An intake pipe, used to be connected to an intake valve of an engine; An exhaust pipe, used to be connected to an exhaust valve of the engine; An electronic supercharger, arranged in the intake pipe; An electrically heated catalyst is arranged in the exhaust pipe; An electric variable valve timing system, for being provided in a valve mechanism of the engine; A control module is connected to the electronic supercharger, the electric heating catalyst and the electric variable valve timing system, respectively, and is used for: detecting a crankshaft phase of the engine in a stopped state; According to the crankshaft phase, the electric variable valve timing system is controlled to adjust the opening timing of the intake valve and the exhaust valve to form a preset valve overlap angle, so that under the action of the electronic supercharger, the valve overlap angle is utilized to increase the exhaust flow rate to the electrically heated catalyst, so that the catalyst inside the electrically heated catalyst reaches the operating temperature.

2. The exhaust gas treatment system according to claim 1, characterized in that The electric variable valve timing system includes an electric variable intake valve timing system and an electric variable exhaust valve timing system; The electrically variable intake valve timing system and the electrically variable exhaust valve timing system are both arranged in the valve mechanism.

3. The exhaust gas treatment system according to claim 2, characterized in that The exhaust gas treatment system further comprises: A post-processing module, arranged in the exhaust pipe, for further purifying the exhaust gas after being processed by the electric heating catalyst; a muffler, arranged in the exhaust pipe; Wherein, the electrically heated catalyst, the post-processing module and the muffler are arranged in sequence along the exhaust direction.

4. The exhaust gas treatment system according to claim 3, characterized in that The exhaust gas treatment system further comprises: an exhaust bypass pipeline connected to the exhaust pipeline, and an inlet of the exhaust bypass pipeline is arranged between the post-processing module and the muffler; The electronic valve is arranged in the exhaust bypass pipeline.

5. An exhaust gas treatment method, characterized in that: Applied to the exhaust gas treatment system according to any one of claims 1 to 4, the method comprises: Detect the crankshaft phase of the engine when it is stopped; According to the crankshaft phase, the electric variable valve timing system is controlled to adjust the opening timing of the intake valve and the exhaust valve to form a preset valve overlap angle, so that under the action of the electronic supercharger, the valve overlap angle is utilized to increase the exhaust flow rate to the electrically heated catalyst, so that the catalyst inside the electrically heated catalyst reaches the operating temperature.

6. The exhaust gas treatment method according to claim 5, characterized in that: After the electric variable valve timing system is controlled according to the crankshaft phase to adjust the opening timing of the intake valve and the exhaust valve, the method further comprises: Get ambient temperature, exhaust back pressure and exhaust temperature; Dynamically adjusting the opening of the electronic valve according to the ambient temperature, the valve overlap angle and the exhaust back pressure so as to maintain the exhaust back pressure within a target range; dynamically adjusting the power of the electrically heated catalyst according to the ambient temperature, the valve overlap angle, the exhaust back pressure and the exhaust temperature; The valve overlap angle and / or the power of the electronic supercharger are dynamically adjusted according to the ambient temperature.

7. The exhaust gas treatment method according to claim 6, characterized in that: The dynamically adjusting the valve overlap angle and / or the power of the electronic supercharger according to the ambient temperature includes: When the ambient temperature is within a first preset temperature range, adjusting the valve overlap angle according to a first preset overlap angle adjustment value, and / or adjusting the power of the electronic supercharger according to a first preset power adjustment value; When the ambient temperature is within a second preset temperature range, adjusting the valve overlap angle according to a second preset overlap angle adjustment value, and / or adjusting the power of the electronic supercharger according to a second preset power adjustment value; When the ambient temperature is within a third preset temperature range, the valve overlap angle is adjusted according to a third preset overlap angle adjustment value, and / or the power of the electronic supercharger is adjusted according to a third preset power adjustment value.

8. A controller comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the exhaust gas treatment method according to any one of claims 5 to 7 is implemented.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the exhaust gas treatment method according to any one of claims 5 to 7 is implemented.

10. A vehicle, characterized in that: The vehicle comprises the exhaust gas treatment system according to any one of claims 1 to 4 , or the vehicle comprises the controller according to claim 8 .

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