Asymmetric turbocharger, control method for asymmetry, and storage medium

Abstract

The application provides an asymmetric turbocharger, a control method of asymmetry and a storage medium, and belongs to the technical field of engines. The asymmetric turbocharger comprises a turbine, a stepping motor and a controller. A first flow channel and a second flow channel are arranged in the volute of the turbine. The first flow channel and the second flow channel are communicated with the exhaust port of the engine. The flow area of the first flow channel is fixed, and the flow area of the second flow channel is adjustable. The first side of the shell of the second flow channel and the shell of the first flow channel are in an integral structure. The stepping motor is used for controlling the displacement of the second side of the shell of the second flow channel to adjust the flow area of the second flow channel. The controller is in communication connection with the engine and the stepping motor, is used for receiving the working condition parameters of the engine, and controls the stepping motor to adjust the flow area of the second flow channel based on the working condition parameters, so that the asymmetry between the first flow channel and the second flow channel reaches a target asymmetry. The problem of large pump loss caused by the asymmetric turbocharger at high speed is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engines, in particular to an asymmetric turbocharger, a control method of asymmetry and a computer readable storage medium. BACKGROUND

[0002] In order to realize efficient EGR flow, especially in the low speed working condition of the engine, it is necessary to establish a sufficient pressure difference in the EGR circuit. In view of this requirement, an asymmetric turbocharger is commonly used at present.

[0003] The existing asymmetric turbocharger has the risk of turbine overspeed and back pressure rise in high speed working condition, which increases the pumping loss. SUMMARY

[0004] The main purpose of the present application is to provide an asymmetric turbocharger, a control method of asymmetry and a computer readable storage medium, so as to at least solve the problem of large pumping loss caused by the asymmetric turbocharger in high speed in the prior art.

[0005] In order to achieve the above purpose, according to one aspect of the present application, an asymmetric turbocharger is provided, comprising: a turbine, a first flow channel and a second flow channel are arranged in the volute of the turbine, the first flow channel and the second flow channel are communicated with the exhaust port of the engine, the flow area of the first flow channel is fixed, the flow area of the second flow channel can be adjusted within a preset range, the shell of the second flow channel is split type, the first side of the shell of the second flow channel is integrated with the shell of the first flow channel; a stepper motor, the stepper motor is connected with the second side of the shell of the second flow channel through a connecting shaft, used for controlling the displacement of the second side of the shell of the second flow channel to adjust the flow area of the second flow channel; a controller, the controller is in communication connection with the engine and the stepper motor, used for receiving the working condition parameters of the engine, and controlling the stepper motor to adjust the flow area of the second flow channel based on the working condition parameters and a preset engine working condition and asymmetry mapping relationship table, so as to control the asymmetry between the first flow channel and the second flow channel to reach a target asymmetry, the asymmetry is the ratio of the flow area of the second flow channel to the flow area of the first flow channel.

[0006] Optionally, the asymmetric turbocharger further comprises: a displacement sensor, the displacement sensor is arranged on the shell of the first flow channel, used for detecting the displacement information of the second side of the shell of the second flow channel, and transmitting the displacement information to the controller.

[0007] Optionally, the volute of the turbine comprises a ring groove arranged on the second side of the casing of the second flow channel, and the ring groove is provided with a guide mechanism for controlling the movement of the second side of the casing of the second flow channel in a first direction of the ring groove, the first direction of the ring groove being a direction perpendicular to the axial center line of the second flow channel.

[0008] Optionally, the asymmetric turbocharger further comprises a compressor connected to the turbine.

[0009] Optionally, the asymmetric turbocharger further comprises a bypass pipeline provided with a bleed valve for discharging exhaust gas of the first flow channel and the second flow channel to the rear of the turbine to reduce the rotating speed of the turbine.

[0010] According to another aspect of the present application, a control method of an asymmetry degree of any one of the asymmetric turbochargers is provided, comprising: obtaining working condition parameters of an engine, the working condition parameters comprising an engine rotating speed and a circulating fuel injection amount; determining a target asymmetry degree corresponding to the working condition parameters according to the working condition parameters through a preset engine working condition and asymmetry degree mapping relationship table; and controlling a stepper motor to adjust the displacement of the second side of the casing of the second flow channel to adjust the flow area of the second flow channel so that the asymmetry degree between the first flow channel and the second flow channel reaches the target asymmetry degree, the asymmetry degree being a ratio of the flow area of the second flow channel to the flow area of the first flow channel.

[0011] Optionally, before determining the target asymmetry degree corresponding to the working condition parameters according to the working condition parameters through the preset engine working condition and asymmetry degree mapping relationship table, the method further comprises: performing performance simulation on different engine working conditions to determine target EGR rates under the different engine working conditions; adjusting the flow area of the second flow channel based on the target EGR rates to obtain target flow areas of the second flow channel under the different engine working conditions and determine target displacement signals corresponding to the target flow areas of the second flow channel; determining asymmetry degrees under the different engine working conditions according to the target flow areas of the second flow channel and the flow area of the first flow channel; and constructing the preset engine working condition and asymmetry degree mapping relationship table based on the asymmetry degrees under the different engine working conditions and the target displacement signals.

[0012] Optionally, the control of the step motor to adjust the displacement of the second side of the shell of the second flow channel to adjust the flow area of the second flow channel so that the asymmetry between the first flow channel and the second flow channel reaches the target asymmetry, the asymmetry being the ratio of the flow area of the second flow channel to the flow area of the first flow channel, comprises: matching the target asymmetry and a target displacement signal corresponding to the current working condition parameter of the engine from the preset engine working condition and asymmetry mapping table; comparing the target asymmetry with the current asymmetry to determine a displacement adjustment signal of the second side of the shell of the second flow channel; and controlling the step motor to adjust the displacement of the second side of the shell of the second flow channel according to the displacement adjustment signal to adjust the flow area of the second flow channel.

[0013] Optionally, the comparison of the target asymmetry with the current asymmetry to determine a displacement adjustment signal of the second side of the shell of the second flow channel comprises: judging whether the flow area of the second flow channel is consistent with the flow area of the second flow channel corresponding to the target asymmetry; and if the flow area of the second flow channel is not consistent with the flow area of the second flow channel corresponding to the target asymmetry, determining the displacement signal of the second flow channel corresponding to the target asymmetry as the displacement adjustment signal.

[0014] According to still another aspect of the present application, a computer readable storage medium is provided, which comprises a stored program, wherein the program, when executed, controls a device where the computer readable storage medium is located to perform any of the asymmetry control methods.

[0015] The technical scheme is applied to an asymmetric turbocharger including a turbine, a stepping motor and a controller. The volute of the turbine is provided with a first flow channel and a second flow channel. The first flow channel and the second flow channel are communicated with an exhaust port of an engine. The flow area of the first flow channel is fixed, and the flow area of the second flow channel can be adjusted within a preset range. The shell of the second flow channel is in a split type, and the first side of the shell of the second flow channel is in an integrated structure with the shell of the first flow channel. The stepping motor is connected with the second side of the shell of the second flow channel through a connecting shaft, and is used for controlling the displacement of the second side of the shell of the second flow channel to adjust the flow area of the second flow channel. The controller is in communication connection with the engine and the stepping motor, is used for receiving working condition parameters of the engine, and controls the stepping motor to adjust the flow area of the second flow channel based on the working condition parameters and a preset engine working condition and asymmetry mapping relationship table, so as to control the asymmetry between the first flow channel and the second flow channel to reach a target asymmetry. The asymmetry is the ratio of the flow area of the second flow channel to the flow area of the first flow channel. In the scheme, the first flow channel with a fixed flow area and the second flow channel with an adjustable flow area are combined to realize the dynamic adjustment of the asymmetry of the turbocharger. The displacement of the second side of the shell of the second flow channel is controlled by the stepping motor, the flow area of the second flow channel can be adjusted according to the actual working condition of the engine, the pumping loss can be reduced when the engine is at high speed or low EGR demand, and the problem of large pumping loss caused by the asymmetric turbocharger at high speed is solved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings constituting a part of the specification of the present application are used to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0017] Figure 1 A structural schematic diagram of an asymmetric turbocharger provided in an embodiment of the present application is shown;

[0018] Figure 2 A symmetry adjustment structural schematic diagram of an asymmetric turbocharger provided in an embodiment of the present application is shown;

[0019] Figure 3 A flow schematic diagram of a control method of an asymmetry provided in an embodiment of the present application is shown;

[0020] Figure 4 A structural schematic diagram of a specific asymmetric turbocharger provided in an embodiment of the present application is shown;

[0021] Figure 5 A symmetry adjustment structural schematic diagram of another asymmetric turbocharger provided in an embodiment of the present application is shown;

[0022] Figure 6A control logic diagram of a specific asymmetric turbocharger is shown according to an embodiment of the present application;

[0023] Figure 7 A structural block diagram of a control device of an asymmetric degree is shown according to an embodiment of the present application.

[0024] Wherein, the above figures include the following reference signs:

[0025] 01, asymmetric turbocharger; 10, turbine; 101, first flow channel; 102, second flow channel; 103, annular groove; 20, stepping motor; 30, controller; 40, engine; 50, displacement sensor. DETAILED DESCRIPTION

[0026] It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0027] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0028] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0029] As introduced in the background, the asymmetric turbocharger in the prior art has the risk of turbine overspeed and back pressure rising under high speed working condition, which increases the pumping loss. In order to solve the problem of large pumping loss caused by asymmetric turbocharger at high speed, the embodiments of the present application provide an asymmetric turbocharger, a control method of asymmetric degree and a computer readable storage medium.

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

[0031] Figure 1 is a structural schematic diagram of an asymmetric turbocharger provided in an embodiment of the present application, as Figure 1 shown, the asymmetric turbocharger 01 includes a turbine 10, a stepper motor 20, and a controller 30. The volute of the turbine 10 is provided with a first flow channel 101 and a second flow channel 102. The first flow channel and the second flow channel are in communication with the exhaust port of an engine 40. The flow area of the first flow channel 101 is fixed, and the flow area of the second flow channel 102 can be adjusted within a preset range. The shell of the second flow channel 102 is of a split type, and the first side of the shell of the second flow channel 102 is of an integrated structure with the shell of the first flow channel 101. The stepper motor 20 is connected with the second side of the shell of the second flow channel 102 through a connecting shaft, for controlling the displacement of the second side of the shell of the second flow channel 102 to adjust the flow area of the second flow channel 102. The controller 30 is in communication connection with the engine 40 and the stepper motor 20, for receiving the working condition parameters of the engine 40, and controlling the stepper motor 20 to adjust the flow area of the second flow channel 102 based on the working condition parameters and a preset engine working condition and asymmetry mapping relationship table, so as to control the asymmetry between the first flow channel 101 and the second flow channel 102 to reach a target asymmetry. The asymmetry is the ratio of the flow area of the second flow channel 102 to the flow area of the first flow channel 101.

[0032] Specifically, the asymmetric turbocharger of the present application is characterized by the ability to dynamically adjust the asymmetry to adapt to the needs of the engine under different working conditions. The asymmetric turbocharger mainly includes three key components: a turbine, a stepper motor, and a controller. The volute of the turbine is designed with two flow channels, namely a first flow channel and a second flow channel, both of which are in communication with the exhaust port of the engine. The flow area of the first flow channel is fixed, and the flow area of the second flow channel can be adjusted within a certain preset range. The shell of the second flow channel is designed to be split, i.e., the first side is integrated with the shell of the first flow channel, and the second side is connected with the stepper motor through a connecting shaft. The stepper motor controls the displacement of the second side of the shell of the second flow channel to adjust the flow area of the second flow channel. When the motor drives the second side of the shell of the second flow channel to move, it can change the size of the flow area of the second flow channel, thereby affecting the exhaust flow rate passing through it.

[0033] The controller is in communication with the engine and the stepper motor, receives real-time operating parameters (such as engine speed and cycle injection quantity) from the engine, and controls the action of the stepper motor by analyzing these parameters and a preset engine operating condition and asymmetry mapping table, thereby adjusting the flow area of the second flow passage. The ultimate goal is to make the asymmetry between the first flow passage and the second flow passage reach an optimal state, i.e., the target asymmetry, and the target asymmetry is the ratio of the flow area of the second flow passage to the flow area of the first flow passage.

[0034] The structural design and control logic of the asymmetric turbocharger of the embodiment can improve the flexibility and efficiency of the turbocharger. In the low-speed operating condition, the controller can control the stepper motor to reduce the flow area of the second flow passage, increase the pre-turbine pressure, thereby improve the EGR flow, and meet the emission requirements. In the high-speed or low EGR demand condition, the controller controls the stepper motor to increase the flow area of the second flow passage, reduces the exhaust back pressure, reduces the pumping loss, and improves the fuel economy. In addition, by real-time monitoring and adjusting the asymmetry, the reliability problems caused by high back pressure, such as sealing failure, can be avoided, and the safe and stable operation of the turbocharger and the engine is ensured.

[0035] By combining the first flow passage with a fixed flow area and the second flow passage with an adjustable flow area, dynamic adjustment of the asymmetry of the turbocharger is realized. By controlling the displacement of the second side of the housing of the second flow passage through the stepper motor, the flow area of the second flow passage can be adjusted according to the actual operating condition of the engine, and the pumping loss can be reduced in the high-speed or low EGR demand condition. In short, the asymmetric turbocharger of the embodiment realizes adaptive adjustment of the asymmetry under different engine operating conditions through the adjustable flow area design and control logic, thereby optimizing the working efficiency of the EGR system, and solving the problem of large pumping loss caused by the asymmetric turbocharger at high speed.

[0036] In some embodiments of the present application, as shown in Figure 1 The asymmetric turbocharger 01 further comprises a displacement sensor 50, which is arranged on the housing of the first flow passage 101 and is used to detect the displacement information of the second side of the housing of the second flow passage 102 and transmit the displacement information to the controller 30.

[0037] Specifically, a displacement sensor is arranged on the housing of the first flow passage to detect the displacement change of the second side of the housing of the second flow passage. The displacement refers to the movement distance of the second side of the housing of the second flow passage relative to the first side of the housing of the second flow passage which is fixed. The displacement sensor collects the displacement information of the second side of the housing of the second flow passage in real time. These displacement information affects the size of the flow area of the second flow passage, because the size of the flow area of the second flow passage directly determines the state of the asymmetry. The controller can determine whether the current asymmetry meets the established target value according to the received displacement information combined with the real-time working condition parameters of the engine.

[0038] Through the displacement sensor, the asymmetric turbocharger can achieve more accurate monitoring and adjustment, improving the response speed and control accuracy. This is particularly important for maintaining optimal EGR efficiency and emission control under different engine operating conditions. Through the displacement sensor, even under extreme or rapidly changing operating conditions, the flow area of the second flow passage can be adjusted in time to achieve the ideal asymmetry, thereby optimizing the performance of the engine, improving fuel economy, and reducing unnecessary pumping loss and avoiding safety problems such as seal failure caused by high back pressure. In short, the introduction of the displacement sensor makes the asymmetric turbocharger have stronger adaptability and stability, and can more finely control the asymmetry to meet the needs of the engine under complex operating conditions, ensuring the efficient and reliable operation of the EGR system throughout the entire engine operating range.

[0039] In some embodiments of the present application, as shown in Figure 2 The volute of the turbine 10 includes an annular groove 103 arranged on the second side of the housing of the second flow passage 102, and the annular groove 103 is provided with a guide mechanism for controlling the movement of the second side of the housing of the second flow passage 102 along the first direction of the annular groove 103. The first direction of the annular groove 103 is perpendicular to the axial center line of the second flow passage 102.

[0040] Specifically, the annular groove and the guide mechanism together ensure the stable and directional displacement of the second side of the housing of the second flow passage, so as to realize the accurate regulation of the flow area of the second flow passage. The annular groove is arranged on the second side of the housing of the second flow passage and extends in a direction perpendicular to the axial center line of the second flow passage. The design of the annular groove allows the second side of the housing of the second flow passage to move linearly within the groove without affecting the structural integrity of the entire turbocharger and the normal operation of the turbine. The guide mechanism is a device inside the annular groove for guiding and restricting the movement path of the second side of the housing of the second flow passage. Through the guide mechanism, it can be ensured that the displacement of the second side of the housing of the second flow passage completely follows the first direction set by the annular groove, preventing deviation or jamming during displacement and ensuring the smoothness and accuracy of the displacement process.

[0041] The combination of the annular groove and the guide mechanism not only provides a physical track for the second side displacement of the housing of the second flow passage, but also ensures the stability and accuracy of the structure during displacement, which is the key to achieving dynamic asymmetric adjustment. Specifically, under the action of the stepper motor, the second side of the housing of the second flow passage can move smoothly in the annular groove, thereby accurately adjusting the flow area of the second flow passage to optimize the asymmetry and adapt to the needs of the engine under different operating conditions. The guide mechanism further enhances the controllability of the displacement, avoiding mechanical failures that may occur under high speed or frequent load changes, such as housing jamming, increased friction loss, etc., thereby improving the durability and response speed of the turbocharger.

[0042] In some embodiments of the present application, the above-mentioned asymmetric turbocharger further comprises a compressor, which is connected to the turbine.

[0043] Specifically, the compressor is one of the core components of the asymmetric turbocharger, connected to the turbine and sharing a rotating shaft. The role of the compressor is to use the mechanical energy generated by the turbine rotation to compress the air entering the cylinder, thereby increasing the intake pressure of the engine. When the impeller of the turbine is rotated by the exhaust gas impact, the kinetic energy is transmitted to the compressor impeller through the rotating shaft, which rotates in turn, inhales external air and compresses it to a higher density, and then sends it to the intake manifold of the engine. Such design improves the mass of air entering the cylinder, thereby increasing the combustion efficiency and output power of the engine, while also improving fuel economy.

[0044] In the asymmetric turbocharger, the compressor and the turbine are connected, and by adjusting the flow area of the second flow passage of the turbine, the asymmetry is changed, which can directly affect the exhaust gas flow and pressure reaching the turbine, and then affect the intake pressure and flow of the compressor. This linkage effect enables the engine to dynamically adjust the intake pressure and EGR (Exhaust Gas Recirculation) rate according to the actual operating conditions, achieving a balance between emission control and performance optimization. For example, under low-speed high-load operating conditions, by reducing the flow area of the second flow passage (i.e. reducing the asymmetry), the pre-turbine pressure can be increased, promoting more exhaust gas to be recirculated, reducing the maximum temperature in the combustion chamber, and thereby reducing the generation of NOx, meeting strict emission standards. While under high-speed or low-load operating conditions, by increasing the flow area of the second flow passage (i.e. increasing the asymmetry), the pumping loss can be reduced, the intake efficiency of the compressor can be optimized, and the fuel economy and power output of the engine can be further improved.

[0045] In summary, the synchronous operation of the compressor and turbine, combined with the dynamic adjustment of the asymmetry, enables the asymmetric turbocharger to flexibly adjust the intake pressure and EGR rate within a wide range of engine operating conditions, thereby ensuring high performance and fuel efficiency while meeting emission standards.

[0046] In some embodiments of the present application, the asymmetric turbocharger further comprises a bypass pipeline, and a bleed valve is arranged on the bypass pipeline, wherein the bleed valve is used to discharge exhaust gas from the first flow passage and the second flow passage to the rear of the turbine to reduce the speed of the turbine.

[0047] Specifically, the bypass pipeline is a pipeline connecting between the inlet and outlet of the turbine, and the bleed valve is arranged on the bypass pipeline. When the asymmetric turbocharger is in a high boost pressure or the speed of the turbine is too high, which may exceed its safe operating limit, the bleed valve is opened to release part of the exhaust gas, so that it bypasses the turbine and directly enters the exhaust system or returns to the downstream of the turbine. In this way, the exhaust pressure and flow acting on the turbine blades can be reduced, thereby reducing the speed of the turbine and preventing it from running at an excessively high speed. In the asymmetric turbocharger, if the flow area of the second flow passage has been adjusted to the maximum but still cannot meet the demand of reducing the pumping loss, or the speed of the turbine abnormally rises due to the adjustment of the asymmetry, the bleed valve is controlled to open to let part of the exhaust gas flow away from the bypass pipeline, thereby reducing the working load of the turbine. Conversely, in the low-speed operating condition, the bleed valve is usually kept closed to ensure that as much exhaust gas as possible is used to drive the turbine to achieve high EGR flow.

[0048] The arrangement of the bypass pipeline and the bleed valve not only helps to protect the turbocharger from the risk of excessive speed damage, but also, in the high-speed operating condition, by timely releasing exhaust gas, it can further reduce the pumping loss, avoid the decline in fuel economy and performance due to excessive exhaust back pressure, and possible safety hazards such as seal failure. Overall, this design improves the operating efficiency and reliability of the asymmetric turbocharger. In summary, the bypass pipeline and the bleed valve enable the asymmetric turbocharger to effectively cope with various complex operating condition challenges that the turbine may encounter while maintaining the high efficiency of the engine.

[0049] The present application also provides a control method of asymmetry applied to any of the above asymmetric turbochargers, Figure 3 is a flowchart of the control method of asymmetry according to an embodiment of the present application. As Figure 3 shown, the method comprises the following steps:

[0050] Step S301, obtaining the operating condition parameters of the engine, wherein the operating condition parameters include the engine speed and the cycle fuel injection amount;

[0051] Step S302, according to the above working condition parameters, the preset engine working condition and the asymmetry mapping relationship table is determined according to the target asymmetry corresponding to the above working condition parameters;

[0052] Step S303, control the stepper motor to adjust the displacement of the second side of the shell of the second flow channel to adjust the flow area of the second flow channel so that the asymmetry between the first flow channel and the second flow channel reaches the target asymmetry, and the asymmetry is the ratio of the flow area of the second flow channel to the flow area of the first flow channel.

[0053] Specifically, first of all, it is necessary to collect the real-time working condition parameters of the engine, mainly including the engine speed and the circulating fuel injection amount, which reflect the current load and running speed of the engine and are the key basis for determining how the asymmetric turbocharger works. According to the collected working condition parameters, the preset engine working condition and the asymmetry mapping relationship table is queried, which is a database established through experiments and simulations in advance, which records in detail the ideal asymmetry setting of the engine under different working conditions. By comparing the current working condition parameters with the data in the preset engine working condition and asymmetry mapping relationship table, the target asymmetry matching the current engine state is determined.

[0054] After obtaining the target asymmetry, the control starts the stepper motor to adjust the displacement of the second side of the shell of the second flow channel, i.e. to change the flow area of the second flow channel. If the current asymmetry is greater than the target value, control the stepper motor to drive the second side of the shell of the second flow channel to move inward, reducing the flow area of the second flow channel; on the contrary, if the asymmetry is less than the target value, control the second side of the shell of the second flow channel to move in the opposite direction to increase the flow area of the second flow channel. Such adjustment is made according to the ratio of the flow area of the second flow channel to the flow area of the first flow channel, i.e. the asymmetry.

[0055] By implementing the above control method, the asymmetric turbocharger can automatically adapt to different working conditions in the entire working range of the engine and accurately adjust the asymmetry, so that in the low speed and high load working condition of the engine, by reducing the flow area of the second flow channel and reducing the asymmetry, the pressure before the turbine can be increased, more exhaust gas can be recirculated, NOx emission can be effectively reduced, and environmental protection requirements can be met; in the high speed and low load working condition of the engine, by increasing the flow area of the second flow channel and increasing the asymmetry, the pump loss can be reduced and the exhaust back pressure can be reduced, so as to improve the fuel economy and overall performance of the engine. The risk of excessive back pressure and turbine overspeed operation of the traditional asymmetric turbocharger in some working conditions is avoided, and the safety and reliability of the system are enhanced. In summary, by combining real-time working condition parameters and pre-established mapping relationship, accurate control of the asymmetric turbocharger is realized, and the engine can obtain better performance and emission control under different operating conditions.

[0056] In the implementation process, before determining the target asymmetry corresponding to the working condition parameter according to the above-mentioned working condition parameter through the preset engine working condition and asymmetry mapping relationship table, the method further comprises: performing performance simulation on different engine working conditions to determine the target EGR rate under the different engine working conditions; adjusting the flow area of the second flow channel based on the target EGR rate to obtain the target flow area of the second flow channel under the different engine working conditions, and determining the target displacement signal corresponding to the target flow area of the second flow channel; determining the asymmetry under the different engine working conditions according to the target flow area of the second flow channel and the flow area of the first flow channel; and constructing the preset engine working condition and asymmetry mapping relationship table based on the asymmetry under the different engine working conditions and the target displacement signal.

[0057] Specifically, before the actual application of the asymmetric turbocharger, performance simulation analysis is performed on different engine working conditions. Advanced computational fluid dynamics (CFD) software or other simulation tools can be used to simulate and predict the performance of the engine under different speeds and different fuel injection amounts, especially the influence of the EGR rate. Through the simulation results, the target EGR rate that the engine should achieve in order to meet the emission requirements of NOx limitation under a specific working condition can be determined.

[0058] After the target EGR rate is determined, the target is achieved by adjusting the flow area of the second flow channel. A series of tests are performed on a test bench, and the influence of the flow area, the EGR rate, and the overall engine performance is recorded by gradually changing the displacement of the second side of the shell of the second flow channel. This process will continue until the optimal second flow channel flow area that can meet the target EGR rate requirement and maintain the engine performance and fuel economy under each working condition is found. Each change in the flow area will correspond to a specific stepper motor displacement signal, i.e., the target displacement signal.

[0059] Based on the target flow area of the second flow channel determined under each working condition and the target EGR rate obtained through simulation, the corresponding asymmetry, i.e., the ratio of the flow area of the second flow channel to the flow area of the first flow channel, is calculated and determined. This step ensures that each working condition point has a clear target asymmetry. Finally, all working condition points, corresponding asymmetries, and target displacement signals are integrated to construct a preset engine working condition and asymmetry mapping relationship table. The preset engine working condition and asymmetry mapping relationship table serves as the basis for adjusting the asymmetry, ensuring that the engine can obtain the best EGR effect and performance at different times.

[0060] The construction of the preset engine operating condition and the asymmetry mapping relationship table is the basis for implementing dynamic asymmetry control. The construction of the preset engine operating condition and the asymmetry mapping relationship table combines the results of theoretical simulation and actual test, ensuring that the obtained data points can truly reflect the optimal asymmetry setting of the engine under different operating conditions. Through this mapping relationship table, the corresponding target asymmetry can be quickly found after real-time monitoring of the engine operating condition parameters, and then the flow area of the second flow passage is accurately adjusted, which not only meets the demand of the EGR rate, but also optimizes the performance and fuel economy of the engine, avoids unnecessary back pressure rise and pumping loss, and improves the stability and safety of the entire system.

[0061] In some embodiments of the present application, the control step motor adjusts the displacement of the second side of the shell of the second flow passage to adjust the flow area of the second flow passage so that the asymmetry between the first flow passage and the second flow passage reaches the target asymmetry, the asymmetry being the ratio of the flow area of the second flow passage to the flow area of the first flow passage, comprising: matching the target asymmetry and target displacement signal corresponding to the current operating condition parameters of the engine from the preset engine operating condition and asymmetry mapping relationship table; comparing the target asymmetry with the current asymmetry to determine the displacement adjustment signal of the second side of the shell of the second flow passage; controlling the step motor to adjust the displacement of the second side of the shell of the second flow passage according to the displacement adjustment signal to adjust the flow area of the second flow passage.

[0062] Specifically, first, the target asymmetry and target displacement signal matching the current engine speed and cycle fuel injection amount are searched from the preset engine operating condition and asymmetry mapping relationship table. Then, the target asymmetry obtained from the preset engine operating condition and asymmetry mapping relationship table is compared with the current asymmetry. If the current asymmetry does not match the target value, the distance that the second side of the shell of the second flow passage needs to move, i.e. the displacement adjustment signal, is calculated based on the difference between the two. This signal indicates the action that the step motor should take, which is the key instruction to adjust the flow area of the second flow passage and thus change the asymmetry. Finally, the displacement adjustment signal is sent to the step motor, which drives the second side of the shell of the second flow passage to move in a predetermined direction and distance, effectively adjusting the flow area of the second flow passage. When the flow area of the second flow passage changes, the ratio of its flow area to that of the first flow passage also changes, i.e. the asymmetry is adjusted. This process continues until the flow area of the second flow passage is adjusted to the right position, and the asymmetry between the first flow passage and the second flow passage reaches the target value.

[0063] Through the above control method, the asymmetric turbocharger can track changes in engine operating conditions in real time during operation and quickly respond to adjust its internal flow channel asymmetry. Instantly identify the engine operating state and quickly match the corresponding asymmetric degree setting, so that the optimal EGR efficiency and performance can be maintained at any point in time. By comparing the target asymmetry with the current asymmetry in real time, the most appropriate displacement adjustment signal can be sent, ensuring that each adjustment is accurate and necessary, avoiding energy waste or performance damage caused by excessive adjustment. The ability to dynamically adjust the asymmetry allows the turbocharger to effectively control emissions while ensuring engine performance, especially when responding to rapidly changing driving environments, allowing flexible adjustments to meet performance requirements under different conditions. In summary, by using the pre-established engine operating condition and asymmetry mapping table, combined with real-time operating conditions, the asymmetric turbocharger can automatically adjust to the ideal working state under various operating conditions.

[0064] Further, comparing the target asymmetry with the current asymmetry to determine the displacement adjustment signal of the second side of the housing of the second flow channel includes: determining whether the flow area of the second flow channel is consistent with the flow area of the second flow channel corresponding to the target asymmetry; if the flow area of the second flow channel is not consistent with the flow area of the second flow channel corresponding to the target asymmetry, the displacement signal of the second flow channel corresponding to the target asymmetry is determined as the displacement adjustment signal.

[0065] Specifically, the flow area of the second flow channel is monitored in real time and compared with the flow area corresponding to the target asymmetry. The target asymmetry and its corresponding flow area are found from the pre-established engine operating condition and asymmetry mapping table according to the performance simulation and bench test data, representing the ideal second flow channel setting under the current operating condition. If the flow area of the second flow channel is not consistent with the flow area corresponding to the target asymmetry, it means that it is in a non-optimal state and needs to be adjusted. At this time, the target displacement signal corresponding to the target asymmetry is determined as the displacement adjustment signal, which contains the precise displacement instruction that the stepper motor needs to make to adjust the position of the second side of the housing of the second flow channel and change the flow area of the second flow channel.

[0066] By monitoring the flow area of the second flow channel in real time and responding immediately when it is found to be mismatched with the target setting, the problem of delay or excessive adjustment that may exist in traditional control methods is avoided. This precise flow area adjustment mechanism helps to reduce unnecessary pumping loss, improve fuel economy, and ensure that the exhaust gas recirculation system can effectively reduce NOx emissions under various operating conditions, meeting environmental protection standards.

[0067] In some embodiments of the present application, an intelligent learning algorithm such as machine learning or deep learning is used to predict the demand for asymmetry under future engine operating conditions. By collecting real-time engine operating data, including speed, fuel injection, intake temperature, exhaust temperature, atmospheric pressure, altitude, and other parameters, and combining historical data and machine learning models, the engine's future operating environment can be predicted. Based on the prediction results, the flow area of the asymmetric flow channel is adjusted in advance to achieve dynamic pre-compensation, avoiding response lag during rapid changes in operating conditions. This intelligent prediction and adaptive adjustment system not only improves control accuracy, but also enhances system response speed and overall efficiency, especially for frequently changing driving conditions such as urban congestion, mountainous roads, etc.

[0068] To enable those skilled in the art to more clearly understand the technical solutions of the present application, the implementation process of the asymmetry control method of the present application will be described in detail below in conjunction with specific embodiments.

[0069] The present embodiment relates to a specific asymmetry control method, which is applied to any of the above asymmetric turbochargers. The specific asymmetric turbocharger structure is shown in Figure 4 The turbine end of the turbocharger includes two flow channels: a large flow channel (first flow channel) with a large flow area and a small flow channel (second flow channel) with an adjustable flow area. By adjusting the flow area of the small flow channel, the asymmetry of different operating conditions is matched. In low-speed operating conditions, the stepper motor is rotated in to reduce the flow area, thereby establishing an EGR loop pressure difference between the small flow channel and the exhaust pipe, achieving ideal EGR flow. In high-speed operating conditions, the stepper motor is rotated out to move the right side of the small flow channel to the right, achieving a larger flow area, thereby reducing exhaust back pressure, improving pumping loss, and improving fuel economy. According to the EGR rate demand based on engine calibration data, the EGR rate demand is achieved by changing the symmetry of the double flow channel (8:2 to 1:1) in different operating conditions.

[0070] The adjustment of the asymmetry of the turbocharger in the present embodiment can be achieved by the structure as shown in Figure 2 and Figure 5 The shell of the small flow channel (second flow channel 102) is made in a split type, the left side is integrated with the shell of the large flow channel (first flow channel 101), and the right side is connected to the stepper motor 20 through a connecting shaft to control the rotation in and out, thereby adjusting the flow area. The right side plate moves in the annular groove 103 left in the volute to achieve positioning and movement.

[0071] To achieve accurate matching of asymmetry and engine operating conditions, the present embodiment proposes a cooperative control method, and the control logic is as shown in Figure 6As shown, its control needs to obtain the non-symmetry Map based on the previous test of non-symmetry and engine operating condition calibration and the corresponding Map relationship of different displacements and non-symmetry and write it into the ECU as the target value, in order to meet the emission requirements, based on the performance simulation of different working conditions of EGR rate demand, the linear displacement signal of the adjustable flow channel that meets the EGR rate demand under different engine working conditions can be obtained through bench test calibration test, according to the displacement of the adjusting flow channel, the corresponding non-symmetry Map is obtained through the area ratio of geometric relationship, and the non-symmetry Map obtained by calibrating the non-symmetry and engine operating condition and the corresponding Map relationship of different displacements and non-symmetry are integrated to obtain the preset engine operating condition and non-symmetry mapping relationship table.

[0072] The linear displacement sensor installed on the shell of the first flow channel monitors the current position of the right side of the small flow channel in real time, the area of the fixed flow channel on the left side is fixed, and the flow area of the right side flow channel can be calculated based on the position of the right side adjustable side plate. The maximum value of the right side area is the upper limit of the displacement, which is consistent with the left side area, and the ratio of the right side area to the left side area is the non-symmetry, so that the current non-symmetry can be calculated. According to the Map of different working conditions of the stepping motor displacement calibrated by the previous bench, the stepping motor signal is output according to the real-time engine working condition to realize accurate control of the required non-symmetry. The linear displacement sensor can also be installed on the turbocharger support.

[0073] The non-symmetry adjustable asymmetric turbocharger and its control method of the embodiment can realize the demand of EGR flow of the engine under low speed working condition of the engine, and can also realize the pump loss under high speed or low EGR demand working condition point by adjusting the non-symmetry, so as to improve the performance and fuel economy of the engine and avoid the reliability risk of blow-by caused by high back pressure.

[0074] In order to further optimize the performance of the asymmetric turbocharger in extreme environment, in some embodiments of the application, a double-flow channel switching mechanism based on temperature and pressure is introduced. During engine operation, when the exhaust temperature or pressure before the turbine is detected to exceed the preset threshold (for example, which may indicate that the EGR circuit pressure is too high or the turbine is about to overspeed), the standby flow channel setting is automatically switched, that is, the flow area of the second flow channel is instantaneously increased, or temporarily converted to a symmetric flow channel mode, to relieve the load of the turbocharger. This mechanism can quickly reduce the back pressure in emergency to prevent turbine overspeed damage, while also avoiding the risk of engine performance decline and seal failure due to excessive back pressure. By integrating temperature and pressure sensors and rapid response logic in emergency situations, the adaptability and reliability of the asymmetric turbocharger are enhanced, ensuring stable operation and optimal performance of the engine under extreme working conditions.

[0075] The embodiment of the present application further provides a control device for asymmetry, and it should be noted that the control device for asymmetry of the embodiment of the present application can be used to execute the control method for asymmetry provided by the embodiment of the present application. The device is used to realize the above-mentioned embodiment and preferred embodiment, and the description has been made and will not be repeated. As used below, the term "module" can be a combination of software and / or hardware that realizes a predetermined function. Although the device described in the following embodiment is preferably realized in software, the realization of hardware or a combination of software and hardware is also possible and conceived.

[0076] The control device for asymmetry provided by the embodiment of the present application is introduced below.

[0077] Figure 7 is a structural block diagram of the control device for asymmetry according to the embodiment of the present application. As shown in Figure 7 , the device comprises an acquisition unit 100, a first determination unit 200 and a control unit 300. The acquisition unit is used to acquire the working condition parameters of the engine, and the working condition parameters comprise the engine speed and the cycle injection amount; the first determination unit is used to determine the target asymmetry corresponding to the working condition parameters according to the working condition of the engine and the mapping relationship table of asymmetry; and the control unit is used to control the step motor to adjust the displacement of the second side of the shell of the second flow channel to adjust the flow area of the second flow channel so that the asymmetry between the first flow channel and the second flow channel reaches the target asymmetry, and the asymmetry is the ratio of the flow area of the second flow channel to the flow area of the first flow channel.

[0078] Through the above-mentioned embodiment, the asymmetric turbocharger can automatically adapt to different working conditions and accurately adjust the asymmetry in the entire working range of the engine, so that in the low speed and high load working condition of the engine, by reducing the flow area of the second flow channel and reducing the asymmetry, the pressure before the turbine can be improved, more exhaust gas recirculation can be promoted, NOx emission can be effectively reduced, and environmental protection requirements can be met; in the high speed and low load working condition of the engine, by increasing the flow area of the second flow channel and increasing the asymmetry, the pumping loss can be reduced, the exhaust back pressure can be reduced, and the fuel economy and overall performance of the engine can be improved. The excessive back pressure and the risk of turbine overspeed operation existing in the traditional asymmetric turbocharger in some working conditions are avoided, and the safety and reliability of the system are enhanced. In short, by combining the real-time working condition parameters and the pre-established mapping relationship, accurate control of the asymmetric turbocharger is realized, and it is ensured that the engine can obtain better performance and emission control under different operating conditions.

[0079] In the implementation process, the device further includes a second determination unit, an adjustment unit, a third determination unit, and a construction unit. The second determination unit is configured to perform performance simulation on different engine operating conditions to determine target EGR rates under the different engine operating conditions before determining the target asymmetry corresponding to the operating condition parameter according to the operating condition parameter and through the preset engine operating condition and asymmetry mapping relationship table. The adjustment unit is configured to adjust the flow area of the second flow channel based on the target EGR rate to obtain a target flow area of the second flow channel under the different engine operating conditions and determine a target displacement signal corresponding to the target flow area of the second flow channel. The third determination unit is configured to determine the asymmetry under the different engine operating conditions according to the target flow area of the second flow channel and the flow area of the first flow channel. The construction unit is configured to construct the preset engine operating condition and asymmetry mapping relationship table based on the asymmetry under the different engine operating conditions and the target displacement signal.

[0080] The construction of the accurate preset engine operating condition and asymmetry mapping relationship table is the basis for implementing dynamic asymmetry control. The construction of the preset engine operating condition and asymmetry mapping relationship table combines the results of theoretical simulation and actual testing, ensuring that the obtained data points can truly reflect the optimal asymmetry settings of the engine under different operating conditions. Through this mapping relationship table, the corresponding target asymmetry can be quickly found after the engine operating condition parameters are monitored in real time, and the flow area of the second flow channel is accurately adjusted, which not only meets the demand for EGR rate, but also optimizes the performance and fuel economy of the engine, avoids unnecessary back pressure rise and pumping loss, and improves the stability and safety of the entire system.

[0081] In some embodiments of the present application, the control unit includes a matching module, a comparison module, and a control module. The matching module is configured to match the target asymmetry and the target displacement signal corresponding to the current operating condition parameter of the engine from the preset engine operating condition and asymmetry mapping relationship table. The comparison module is configured to compare the target asymmetry with the current asymmetry to determine the displacement adjustment signal of the second side of the shell of the second flow channel. The control module is configured to control the stepper motor to adjust the displacement of the second side of the shell of the second flow channel according to the displacement adjustment signal to adjust the flow area of the second flow channel.

[0082] Through the above control method, the asymmetric turbocharger can track changes in engine operating conditions in real time during operation and quickly respond to adjust its internal flow passage asymmetry. Instantly identify the engine operating state and quickly match the corresponding asymmetry setting, so that the optimal EGR efficiency and performance can be maintained at any point in time. By comparing the target asymmetry with the current asymmetry in real time, the most appropriate displacement adjustment signal can be sent, ensuring that each adjustment is accurate and necessary, avoiding energy waste or performance damage caused by excessive adjustment. The ability to dynamically adjust the asymmetry allows the turbocharger to effectively control emissions while ensuring engine performance, especially when dealing with rapidly changing driving environments, allowing flexible adjustments to meet performance requirements under different conditions. In summary, by using the pre-established preset engine operating condition and asymmetry mapping table, combined with real-time operating conditions, the asymmetric turbocharger can automatically adjust to the ideal working state under various operating conditions.

[0083] Further, the comparison module includes a judgment submodule and a determination submodule. The judgment submodule is configured to determine whether the flow area of the second flow passage is consistent with the flow area of the second flow passage corresponding to the target asymmetry; and the determination submodule is configured to determine the displacement signal of the second flow passage corresponding to the target asymmetry as the displacement adjustment signal if the flow area of the second flow passage is not consistent with the flow area of the second flow passage corresponding to the target asymmetry.

[0084] By monitoring the flow area of the second flow passage in real time and responding immediately when a mismatch is found, the problem of delay or excessive adjustment that may exist in traditional control methods is avoided. This precise flow area adjustment mechanism helps to reduce unnecessary pumping loss, improve fuel economy, and ensure that the exhaust gas recirculation system can effectively reduce NOx emissions under various operating conditions, meeting environmental protection standards.

[0085] The control device of the asymmetry includes a processor and a memory, and the acquisition unit, the first determination unit, the control unit, etc. are stored in the memory as program units, and the corresponding functions are realized by the processor executing the program units stored in the memory. The modules are located in the same processor; or, the modules are located in different processors in any combination.

[0086] The memory can include non-persistent memory in a computer readable medium, random access memory (RAM) and / or non-volatile memory such as read-only memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.

[0087] The embodiment of the present application provides a computer readable storage medium, the computer readable storage medium comprises a stored program, wherein the program controls a device where the computer readable storage medium is located to execute the control method of the asymmetry when the program is running.

[0088] The embodiment of the present application provides a processor, the processor is used for running a program, wherein the program executes the control method of the asymmetry when the program is running.

[0089] The embodiment of the present application provides an electronic device, comprising a processor, a memory and a program stored in the memory and capable of running on the processor, and the processor executes the steps of the control method of the asymmetry when the program is running. The device herein can be a server, a PC, a PAD, a mobile phone and the like.

[0090] The present application also provides a computer program product, when executed on a data processing device, is suitable for executing the program of the steps of the control method of the asymmetry.

[0091] Obviously, those skilled in the art should understand that the modules or steps of the present application can be realized by general computing devices, which can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, which can be realized by program codes executable by computing devices, so that they can be stored in storage devices and executed by computing devices, and in some cases, the steps shown or described can be executed in different order, or they can be manufactured into individual integrated circuit modules, or multiple modules or steps can be manufactured into a single integrated circuit module. Thus, the present application is not limited to any particular combination of hardware and software.

[0092] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system or a computer program product. Therefore, the present application can be in the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware aspects. Moreover, the present application can be in the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program codes.

[0093] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flow or blocks Figure 1 one or more flow or blocks

[0094] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flow or blocks Figure 1 one or more flow or blocks

[0095] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flow or blocks Figure 1 one or more flow or blocks

[0096] In one typical configuration, the computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0097] The memory can include non-persistent memory and / or volatile memory, such as a random access memory (RAM) including a cache area for the temporary storage of data. A

[0098] Computer-readable media includes permanent and non-permanent, movable and non-movable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to a computing device. According to the definition herein, computer-readable media does not include transitory media such as modulated data signals and carriers.

[0099] The technical features of the above-described embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not contradict each other, they should be considered to be within the scope of the present specification.

[0100] It should also be noted that the terms "comprising", "containing", or any other variant thereof are intended to cover non-exclusive inclusions, such that processes, methods, articles or devices that include a series of elements not only include those elements, but also include other elements not explicitly listed, or inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article or device that includes the element.

[0101] The above-described only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An asymmetric turbocharger, characterized in that, include: The turbine has a first flow channel and a second flow channel inside its volute. The first flow channel and the second flow channel are connected to the exhaust port of the engine. The flow area of ​​the first flow channel is fixed, and the flow area of ​​the second flow channel can be adjusted within a preset range. The housing of the second flow channel is a split type, and the first side of the housing of the second flow channel is an integral structure with the housing of the first flow channel. A stepper motor is connected to the second side of the housing of the second flow channel via a connecting shaft, and is used to control the displacement of the second side of the housing of the second flow channel to adjust the flow area of ​​the second flow channel; A controller, which is communicatively connected to the engine and the stepper motor, is used to receive the engine's operating parameters and, based on the operating parameters and a preset engine operating condition and asymmetry mapping table, control the stepper motor to adjust the flow area of ​​the second flow channel, so as to control the asymmetry between the first flow channel and the second flow channel to reach a target asymmetry, wherein the asymmetry is the ratio of the flow area of ​​the second flow channel to the flow area of ​​the first flow channel.

2. The asymmetric turbocharger according to claim 1, characterized in that, The asymmetric turbocharger also includes: A displacement sensor is disposed on the housing of the first flow channel to detect displacement information on the second side of the housing of the second flow channel and transmit the displacement information to the controller.

3. The asymmetric turbocharger according to claim 1, characterized in that, The turbine casing includes: An annular groove is provided on the second side of the housing of the second flow channel, and the annular groove is provided with a guiding mechanism for controlling the second side of the housing of the second flow channel to move along the first direction of the annular groove, the first direction of the annular groove being perpendicular to the axial center line of the second flow channel.

4. The asymmetric turbocharger according to claim 1, characterized in that, The asymmetric turbocharger also includes: A compressor, which is connected to the turbine.

5. The asymmetric turbocharger according to claim 1, characterized in that, The asymmetric turbocharger also includes: A bypass pipe is provided, and a vent valve is provided on the bypass pipe. The vent valve is used to discharge the exhaust gas from the first flow channel and the second flow channel to the turbine to reduce the turbine speed.

6. A method for controlling the asymmetry of an asymmetric turbocharger applied to any one of claims 1 to 5, characterized in that, include: The engine operating parameters are obtained, including engine speed and fuel injection quantity per cycle. Based on the operating parameters, the target asymmetry corresponding to the operating parameters is determined by a preset engine operating condition and asymmetry mapping table. The stepper motor is controlled to adjust the displacement of the second side of the housing of the second flow channel to adjust the flow area of ​​the second flow channel so that the asymmetry between the first flow channel and the second flow channel reaches the target asymmetry, wherein the asymmetry is the ratio of the flow area of ​​the second flow channel to the flow area of ​​the first flow channel.

7. The method according to claim 6, characterized in that, Before determining the target asymmetry corresponding to the operating parameters based on the operating parameters using a preset engine operating condition and asymmetry mapping table, the method further includes: Performance simulations were performed under different engine operating conditions to determine the target EGR rate under those different engine operating conditions; The flow area of ​​the second flow channel is adjusted based on the target EGR rate to obtain the target flow area of ​​the second flow channel under different engine operating conditions, and the target displacement signal corresponding to the target flow area of ​​the second flow channel is determined. The asymmetry under different engine operating conditions is determined based on the target flow area of ​​the second flow channel and the flow area of ​​the first flow channel. Based on the asymmetry under different engine operating conditions and the target displacement signal, a mapping table between the preset engine operating conditions and asymmetry is constructed.

8. The method according to claim 6, characterized in that, The stepper motor is controlled to adjust the displacement of the second side of the housing of the second flow channel to adjust the flow area of ​​the second flow channel so that the asymmetry between the first flow channel and the second flow channel reaches the target asymmetry, wherein the asymmetry is the ratio of the flow area of ​​the second flow channel to the flow area of ​​the first flow channel, including: Match the target asymmetry and target displacement signals corresponding to the current operating parameters of the engine from the preset engine operating condition and asymmetry mapping table; The target asymmetry is compared with the current asymmetry to determine the displacement adjustment signal of the second side of the shell of the second flow channel; The stepper motor is controlled to adjust the displacement of the second side of the housing of the second flow channel according to the displacement adjustment signal, so as to adjust the flow area of ​​the second flow channel.

9. The method according to claim 8, characterized in that, Comparing the target asymmetry with the current asymmetry to determine the displacement adjustment signal of the second side of the housing of the second flow channel includes: Determine whether the flow area of ​​the second flow channel is consistent with the flow area of ​​the second flow channel corresponding to the target asymmetry; If the flow area of ​​the second flow channel is inconsistent with the flow area of ​​the second flow channel corresponding to the target asymmetry, then the displacement signal of the second flow channel corresponding to the target asymmetry is determined as the displacement adjustment signal.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the asymmetry control method according to any one of claims 6 to 9.

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