Bypass valve flow capacity determination method and bypass valve flow capacity determination system

Abstract

The invention relates to a bypass valve flow capacity determination method and a bypass valve flow capacity determination system. The method is applied to a bypass valve circulation control system, the system comprises a bypass valve, a driving part and an executing part, and the executing part comprises a spring; the method comprises the following steps: acquiring pressure data related to a bypass valve, and determining valve pressure data according to the pressure data, first pressure correction data and second pressure correction data; valve plate parameters of the bypass valve are determined, a stress correction coefficient is determined according to the valve plate parameters, and valve plate thrust is determined according to the valve pressure data and the stress correction coefficient; determining spring stress data according to the thrust of the valve plate, and determining spring displacement corresponding to the spring stress data; the valve opening curve and the flow capacity curve related to the bypass valve are obtained, the flow capacity value of the bypass valve is determined according to the valve opening curve, the flow capacity curve and the spring displacement, and the accuracy of determining the flow capacity of the bypass valve can be improved.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a method for determining the flow capacity of a bypass valve and a system for determining the flow capacity of a bypass valve. Background Art

[0002] With the rapid development of the automobile industry, engine technology is constantly upgrading, and the application of superchargers has become one of the key means to improve engine performance and fuel economy. Engine superchargers, especially turbochargers, can significantly increase engine power by utilizing exhaust gas energy to increase intake volume and density. However, the efficient operation of superchargers depends on the coordinated work of various components, among which the wastegate valve plays a vital role.

[0003] The main function of the wastegate valve is to regulate the amount of exhaust gas flowing to the supercharger to prevent over-boosting and ensure that the engine operates within a safe and efficient operating range. When the engine reaches the set boost threshold, the bypass valve opens to direct part of the exhaust gas to the exhaust system, thereby controlling the boost level of the supercharger. This control mechanism not only protects the engine from mechanical failure due to excessive boost, but also helps reduce emissions and meet the increasingly stringent environmental regulations for modern vehicles. In order to ensure the normal operation of the wastegate valve, the method for determining the bypass valve flow capacity is particularly important.

[0004] In traditional technology, mechanical detection and visual detection are mainly used to determine the flow capacity of the bypass valve.

[0005] However, traditional methods require a high level of manual operation, and the results of determining the bypass valve flow capacity are greatly affected by subjective factors, which makes it difficult for these methods to provide reliable data support in complex detection environments, thereby reducing the accuracy of determining the bypass valve flow capacity. Summary of the invention

[0006] Based on this, it is necessary to provide a bypass valve flow capacity determination method and a bypass valve flow capacity determination system that can improve the accuracy of determining the bypass valve flow capacity in order to address the above technical issues.

[0007] In a first aspect, the present application provides a method for determining the flow capacity of a bypass valve, which is applied to a bypass valve flow control system, wherein the system includes a bypass valve, a driving member and an actuator, wherein the actuator includes a spring; the method includes:

[0008] Acquire pressure data related to the bypass valve, and determine valve pressure data according to the pressure data and the first pressure correction data and the second pressure correction data;

[0009] Determine the valve plate parameters of the bypass valve, determine the force correction coefficient based on the valve plate parameters, and determine the valve plate thrust based on the valve pressure data and the force correction coefficient;

[0010] Determine the spring force data according to the valve plate thrust, and determine the spring displacement corresponding to the spring force data;

[0011] Obtain a valve opening curve and a flow capacity curve related to the bypass valve, and determine the flow capacity value of the bypass valve according to the valve opening curve, the flow capacity curve and the spring displacement.

[0012] In one embodiment, determining the spring force data according to the valve plate thrust, and determining the spring displacement corresponding to the spring force data, includes:

[0013] Obtaining an execution correction coefficient according to the mechanical parameters of the actuator obtained in advance;

[0014] Acquire pressure data of the driving member, and determine the driving force of the driving member according to the pressure data and an execution correction coefficient;

[0015] The spring force data is determined according to the driving force of the driving member, the thrust of the valve plate and the preload force of the spring acquired in advance.

[0016] In one embodiment, the method further comprises:

[0017] Obtain a stiffness curve related to the spring, and determine the displacement coefficient of the spring according to the stiffness curve;

[0018] The displacement coefficient and the spring force data are processed to obtain the spring displacement corresponding to the spring force data.

[0019] In one embodiment, obtaining a valve opening curve and a flow capacity curve related to the bypass valve, and determining the flow capacity value of the bypass valve according to the valve opening curve, the flow capacity curve and the spring displacement, includes:

[0020] According to the valve opening curve related to the bypass valve, the angle coefficient related to the bypass valve is determined, and the opening angle of the bypass valve is calculated according to the angle coefficient and the spring displacement;

[0021] According to the flow capacity curve related to the bypass valve, the flow coefficient related to the bypass valve is determined, and the flow capacity value of the bypass valve is calculated according to the flow coefficient and the opening angle of the bypass valve.

[0022] In one embodiment, the pressure data includes first pressure data and second pressure data, and the valve pressure data includes valve front pressure data and valve rear pressure data; obtaining the pressure data related to the bypass valve, and determining the valve pressure data according to the pressure data and the first pressure correction data and the second pressure correction data, comprises:

[0023] Performing calculation processing on the first pressure correction data and the first pressure data to obtain valve front pressure data;

[0024] The second pressure correction data and the second pressure data are processed by operation to obtain valve rear pressure data.

[0025] In one embodiment, determining the valve plate thrust according to valve pressure data and a force correction coefficient includes:

[0026] Performing difference processing on the pre-valve pressure data and the post-valve pressure data to obtain the target valve pressure data;

[0027] The valve thrust is calculated based on the target valve pressure data and the force correction coefficient.

[0028] In a second aspect, the present application further provides a bypass valve flow capacity determination system, which is applicable to the bypass valve flow capacity determination method, and the system includes a control device, and the control device includes:

[0029] A valve pressure determination module, used for acquiring pressure data related to the bypass valve, and determining valve pressure data according to the pressure data and the first pressure correction data and the second pressure correction data;

[0030] A thrust determination module, used to determine valve plate parameters of the bypass valve, determine a force correction coefficient according to the valve plate parameters, and determine the valve plate thrust according to valve pressure data and the force correction coefficient;

[0031] A displacement determination module, used to determine the spring force data according to the valve plate thrust, and determine the spring displacement corresponding to the spring force data;

[0032] The flow capacity determination module is used to obtain the valve opening curve and flow capacity curve related to the bypass valve, and determine the flow capacity value of the bypass valve according to the valve opening curve, the flow capacity curve and the spring displacement.

[0033] In one embodiment, the first end of the actuator is connected to the driving member, and the second end of the actuator is connected to the bypass valve for controlling the opening and closing of the bypass valve.

[0034] In one of the embodiments, the pressure data includes first pressure data and second pressure data; the system further includes an exhaust manifold, on which a first pressure sensor is disposed, and the first pressure sensor is used to collect the first pressure data.

[0035] In one of the embodiments, the system further includes a post-processing unit, on which a second pressure sensor is provided, and the second pressure sensor is used to collect second pressure data.

[0036] The above-mentioned bypass valve flow capacity determination method and bypass valve flow capacity determination system, the system includes a bypass valve, a driving member and an actuator, the actuator includes a spring; the method includes: obtaining pressure data related to the bypass valve, and determining valve pressure data based on the pressure data and first pressure correction data and second pressure correction data; determining the valve plate parameters of the bypass valve, determining the force correction coefficient based on the valve plate parameters, and determining the valve plate thrust based on the valve pressure data and the force correction coefficient; determining the spring force data based on the valve plate thrust, and determining the spring displacement corresponding to the spring force data; obtaining the valve opening curve and flow capacity curve related to the bypass valve, and determining the bypass valve flow capacity value based on the valve opening curve, the flow capacity curve and the spring displacement, which can improve the accuracy of the bypass valve flow capacity determination. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] FIG1 is an application environment diagram of a method for determining the flow capacity of a bypass valve in one embodiment;

[0039] FIG2 is a schematic flow chart of a method for determining the flow capacity of a bypass valve in one embodiment;

[0040] FIG3 is a schematic diagram of a flow chart of a step of determining a spring displacement in one embodiment;

[0041] FIG4 is a schematic structural diagram of a bypass valve flow capacity determination system in another embodiment;

[0042] FIG. 5 is a structural block diagram of a control device in one embodiment.

[0043] 10. Bypass valve flow capacity determination system; 30. Engine; 11. Exhaust manifold pressure sensor; 12. DPF pressure difference sensor; 13. SCR pre-pressure sensor; 14. Intake pipe; 15. Exhaust main pipe; 16. Exhaust manifold; 100. Control device; 200. Bypass valve; 300. Drive element; 400. Actuator; 500. Supercharger; 600. After-treatment system. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application 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 application and are not used to limit the present application.

[0045] The bypass valve flow capacity determination method provided in the embodiment of the present application can be applied in the application environment shown in FIG1. ​​Among them, the terminal 20 communicates with the bypass valve flow control system 10 through the network. The terminal 20 sends a bypass valve flow capacity determination request to the bypass valve flow control system 10, and the bypass valve flow control system 10 receives the bypass valve flow capacity determination request, obtains the bypass valve related pressure data, and determines the valve pressure data according to the pressure data and the first pressure correction data and the second pressure correction data; determines the valve plate parameters of the bypass valve, determines the force correction coefficient according to the valve plate parameters, and determines the valve plate thrust according to the valve pressure data and the force correction coefficient; determines the spring force data according to the valve plate thrust, and determines the spring displacement corresponding to the spring force data; obtains the valve opening curve and flow capacity curve related to the bypass valve, and determines the bypass valve flow capacity value according to the valve opening curve, the flow capacity curve and the spring displacement. Among them, the terminal 20 can be, but is not limited to, various personal computers, laptops, smart phones, tablet computers, Internet of Things devices and portable wearable devices, and the Internet of Things devices can be smart speakers, smart TVs, smart air conditioners, smart car devices, etc. The portable wearable device may be a smart watch, a smart bracelet, a head-mounted device, etc. The bypass valve flow control system 10 may include a server.

[0046] In an exemplary embodiment, as shown in FIG2 , a method for determining the flow capacity of a bypass valve is provided, and the method is described by taking the bypass valve flow control system in FIG1 as an example, the system includes a bypass valve, a driving member and an actuator, and the actuator includes a spring; the method includes the following steps 202 to 208. Among them:

[0047] Step 202 , obtaining pressure data related to the bypass valve, and determining valve pressure data according to the pressure data and the first pressure correction data and the second pressure correction data.

[0048] Optionally, the pressure data may include multiple pressure data, such as the pressure data includes first pressure data and second pressure data. The first pressure correction data and the second pressure correction data are used to correct the first pressure data and the second pressure data respectively to obtain corresponding corrected data, which are recorded as valve pressure data.

[0049] Step 204 , determining valve plate parameters of the bypass valve, determining a force correction coefficient according to the valve plate parameters, and determining the valve plate thrust according to the valve pressure data and the force correction coefficient.

[0050] Among them, the valve plate parameters of the bypass valve mainly refer to several key factors related to the performance and working characteristics of the valve plate. The valve plate parameters of the bypass valve can include the surface area of ​​the valve plate and the arm length of the valve plate, and can also include the valve plate thickness, material properties, contact state between the valve plate and the valve body, and sealing effect. The surface area of ​​the valve plate refers to the effective area where the valve plate contacts the gas, and the arm length of the valve plate refers to the distance from the fulcrum of the valve plate to the force point of the valve plate. The arm length of the valve plate can affect the torque when the valve plate is opened. The force correction coefficient is used to correct the force of the valve plate of the bypass valve under different working conditions. The valve plate thrust refers to the thrust required to open the bypass valve. When the valve plate thrust is large enough, the valve plate of the bypass valve can be opened to allow the exhaust gas to pass through, thereby controlling the working state of the supercharger. This valve plate thrust is very important to ensure the normal operation of the engine and prevent over-boosting.

[0051] Step 206, determining the spring force data according to the valve plate thrust, and determining the spring displacement corresponding to the spring force data.

[0052] Among them, the spring in the bypass valve can be used to control the opening and closing of the bypass valve disc. The main function of the spring is to provide a reverse force to ensure that the valve disc remains closed when it does not need to be opened. When the exhaust gas pressure reaches a certain level, the thrust overcomes the reaction force of the spring and pushes the valve disc to open. After the valve disc is closed, the spring can quickly restore it to its initial position to ensure the rapid response and reliability of the bypass valve. The stiffness and preload of the spring can adjust the opening time and opening degree of the bypass valve disc, thereby affecting the supercharger's supercharging effect. The spring force data refers to the magnitude of the force acting on the spring under specific working conditions. The spring displacement refers to the distance the spring is compressed or stretched under force, usually in millimeters (mm).

[0053] Optionally, after the valve plate thrust is determined, spring force data is calculated based on the preload force of the spring, and a spring displacement corresponding to the spring force data is determined based on the spring force data and the stiffness (spring constant) of the spring.

[0054] Step 208, obtaining a valve opening curve and a flow capacity curve related to the bypass valve, and determining the flow capacity value of the bypass valve according to the valve opening curve, the flow capacity curve and the spring displacement.

[0055] For example, the valve opening curve related to the bypass valve refers to the spring displacement and valve opening curve, and the flow capacity curve refers to the valve opening and bypass valve flow capacity curve. The valve opening is determined based on the spring displacement and valve opening curve and the spring displacement. And the bypass valve flow capacity value is determined based on the valve opening and bypass valve flow capacity curve.

[0056] In the above-mentioned method for determining the flow capacity of the bypass valve, the pressure data related to the bypass valve is obtained, and the valve pressure data is determined according to the pressure data and the first pressure correction data and the second pressure correction data. The correction is performed under various working conditions using multiple correction coefficients, which can flexibly respond to different working conditions and reduce the failure rate; the valve plate parameters of the bypass valve are determined, and the force correction coefficient is determined according to the valve plate parameters, and the valve plate thrust is determined according to the valve pressure data and the force correction coefficient; the spring force data is determined according to the valve plate thrust, and the spring displacement corresponding to the spring force data is determined; the valve opening curve and flow capacity curve related to the bypass valve are obtained, and the bypass valve flow capacity value is determined according to the valve opening curve, the flow capacity curve and the spring displacement. This method can improve the accuracy of determining the flow capacity of the bypass valve by obtaining the pressure data related to the bypass valve in real time and calculating the valve plate opening angle, accurately control the opening degree of the bypass valve, prevent closed-loop saturation, and thereby improve the control accuracy of the engine air system.

[0057] In an exemplary embodiment, the pressure data includes first pressure data and second pressure data, and the valve pressure data includes pre-valve pressure data and post-valve pressure data; the pressure data related to the bypass valve is obtained, and the valve pressure data is determined according to the pressure data and the first pressure correction data and the second pressure correction data, including: performing calculation processing on the first pressure correction data and the first pressure data to obtain pre-valve pressure data; performing calculation processing on the second pressure correction data and the second pressure data to obtain post-valve pressure data.

[0058] The first pressure data is the exhaust manifold pressure data, which can be obtained by the exhaust manifold pressure sensor provided on the exhaust manifold. The second pressure data is the pressure signal before the selective catalytic reduction (SCR) of the after-treatment system and the pressure differential signal of the diesel particulate filter (DPF), and the pressure signal before the SCR and the pressure differential signal of the DPF can be obtained by the SCR pre-pressure sensor and the DPF pressure differential sensor provided in the after-treatment system. The first pressure correction data is the exhaust manifold pressure correction data, and the second pressure correction data is the after-treatment system correction data. The valve pre-pressure data is the bypass valve pre-pressure, and the valve post-pressure data is the bypass valve post-pressure.

[0059] Among them, the exhaust manifold is part of the engine exhaust system, and the exhaust gas flows from the engine to the next link through this pipe. The exhaust manifold pressure data refers to the pressure value in the exhaust manifold obtained by the exhaust manifold pressure sensor. The aftertreatment system refers to a series of equipment installed at the rear of the engine exhaust system, mainly used to treat and reduce emissions to meet environmental protection standards. The aftertreatment system may include a catalytic reduction device (SCR), a selective catalytic reduction system for converting nitrogen oxides (NOx) into harmless nitrogen and water. The aftertreatment system may also include a diesel particulate filter (DPF) for capturing and removing particulate matter in diesel exhaust. The pre-SCR pressure signal refers to the pressure value measured at the inlet of the SCR system, which can reflect the pressure state of the exhaust gas entering the catalytic reduction device. The DPF differential pressure signal refers to the pressure difference between the two ends (inlet and outlet) of the diesel particulate filter, which can indicate the degree of filter blockage.

[0060] Exemplarily, the exhaust manifold pressure data is obtained according to the exhaust manifold pressure sensor. Afterwards, the correction map is used to calculate the exhaust manifold pressure correction data under different engine operating conditions , and based on the exhaust manifold pressure data and exhaust manifold pressure correction data , calculate the pressure before the bypass valve , the calculation formula is Among them, different engine operating conditions refer to the state of the engine under various operating conditions, which may include idling conditions, light load conditions, heavy load conditions, acceleration conditions, etc. The corrected spectrum is a signal processing-based technology used to analyze and correct the spectrum of sensor data, which can be obtained through experiments and tests. It can compare the actual collected pressure signal with the predefined ideal state, thereby identifying deviations under specific working conditions and making corrections.

[0061] The SCR pre-pressure signal is obtained based on the SCR pre-pressure sensor and the DPF pressure difference sensor And DPF pressure difference signal Afterwards, the correction map is used to calculate the correction data of the after-treatment system under different engine operating conditions , and correct the data according to the post-processing system , SCR front pressure signal And DPF pressure difference signal Calculate the pressure after the bypass valve , the calculation formula is .

[0062] In this embodiment, under different engine operating conditions, the corresponding pressure correction data is determined by correcting the map, which can improve the adaptability and flexibility of determining the bypass valve flow capacity. Through the real-time acquired pressure data and pressure correction data, the accurate bypass valve inlet pressure and bypass valve outlet pressure can be determined, thereby accurately reflecting the bypass valve flow capacity under different engine operating conditions and improving the reliability of determining the bypass valve flow capacity.

[0063] In an exemplary embodiment, the valve plate thrust is determined according to the valve pressure data and the force correction coefficient, including: performing difference processing on the pre-valve pressure data and the post-valve pressure data to obtain the target valve pressure data; and calculating the valve plate thrust according to the target valve pressure data and the force correction coefficient.

[0064] Exemplarily, the force correction coefficient is determined according to the valve plate parameters The valve plate parameters are the surface area of ​​the valve plate and the length of the valve plate's lever arm. The difference between the valve front pressure data and the valve rear pressure data is calculated, that is, the bypass valve front pressure and bypass valve downstream pressure Perform difference processing to obtain . According to the target valve pressure data and force correction factor , calculate the valve thrust for:

[0065]

[0066] In this embodiment, the force correction coefficient is determined according to the valve plate parameters, so that the valve plate thrust of the bypass valve can be evaluated more accurately, and the optimal opening state of the valve plate can be determined, thereby effectively improving the reliability of determining the flow capacity of the bypass valve.

[0067] In an exemplary embodiment, as shown in FIG3 , determining the spring force data according to the valve plate thrust, and determining the spring displacement corresponding to the spring force data, includes steps 302 to 306 . Among them:

[0068] Step 302: Obtain an execution correction coefficient according to the pre-acquired mechanical parameters of the actuator.

[0069] Step 304, obtaining pressure data of the driving member, and determining the driving force of the driving member according to the pressure data and the execution correction coefficient.

[0070] Step 306, determining spring force data according to the driving force of the driving member, the valve plate thrust, and the pre-acquired preload force of the spring.

[0071] Among them, the actuator refers to an actuator, which is used to control the opening and closing degree of the bypass valve disc to adjust the flow of exhaust gas. The mechanical parameters of the actuator refer to the mechanical dimensions of the actuator, which may include the diameter, length, lever arm, etc. of the actuator. The driving part refers to the adjustable pressure gas source of the bypass valve, that is, it refers to the gas pressure source used to drive the bypass valve. The adjustable pressure gas source is connected to the actuator, and the opening and closing of the valve disc is controlled by adjusting the pressure of the gas source. Specifically, when the gas source pressure of the adjustable pressure gas source changes, the driving force of the actuator will also change accordingly, thereby affecting the opening degree of the bypass valve. The pressure data of the driving part refers to the gas source pressure of the adjustable pressure gas source. The spring preload refers to the initial force applied by the spring itself when the spring is not subjected to external load. The spring force data refers to the force applied to the spring.

[0072] Optionally, the actuator correction factor is calculated based on the mechanical dimensions of the actuator. , to perform the correction factor And the pressure data of the drive parts Perform product processing to obtain the driving force of the driving member. Then add the driving force of the driving member and the valve thrust and spring preload Perform calculations to obtain spring force data :

[0073]

[0074] In this embodiment, by executing the correction coefficient and pressure data, the accurate driving force of the driving member can be obtained. After adding the driving force of the driving member and the valve plate thrust, the spring preload force is subtracted. This can more truly reflect the actual thrust applied to the valve plate of the bypass valve, thereby further improving the reliability of determining the flow capacity of the bypass valve.

[0075] In an exemplary embodiment, the method further includes: obtaining a stiffness curve associated with the spring, and determining a displacement coefficient of the spring according to the stiffness curve; and performing computational processing on the displacement coefficient and spring force data to obtain a spring displacement corresponding to the spring force data.

[0076] Based on the stiffness characteristics of the bypass valve spring, the displacement coefficient of the spring is calculated using the spring-related stiffness curve The stiffness characteristic of a spring describes the ability of a spring to deform when subjected to force. The stiffness curve associated with a spring can be determined experimentally by measuring the displacement of the spring under known force conditions, recording the data, and then determining the stiffness curve associated with the spring. And spring force data Perform calculations to obtain spring force data Corresponding spring displacement .

[0077] In this embodiment, the stiffness curve related to the spring actually measured can more accurately reflect the response of the spring under a specific force, reducing the error in the theoretical calculation. At the same time, under different engine working conditions, the force of the spring will change. The use of the stiffness curve can flexibly adjust the calculation and improve the flexibility and accuracy of the determination of the spring displacement.

[0078] In an exemplary embodiment, a valve opening curve and a flow capacity curve related to the bypass valve are obtained, and the flow capacity value of the bypass valve is determined according to the valve opening curve, the flow capacity curve and the spring displacement, including: determining the angle coefficient related to the bypass valve according to the valve opening curve related to the bypass valve, and calculating the opening angle of the bypass valve according to the angle coefficient and the spring displacement; determining the flow coefficient related to the bypass valve according to the flow capacity curve related to the bypass valve, and calculating the flow capacity value of the bypass valve according to the flow coefficient and the opening angle of the bypass valve.

[0079] Optionally, the angle coefficient associated with the bypass valve is determined based on the valve opening curve associated with the bypass valve. , according to the angle coefficient and spring displacement Calculate the opening angle of the bypass valve . According to the bypass valve related flow capacity curve, determine the bypass valve related flow coefficient , and according to the flow coefficient and the opening angle of the bypass valve Calculate the bypass valve flow capacity value .

[0080] In this embodiment, the opening angle of the bypass valve can be calculated more accurately based on the spring displacement and the valve opening curve, and then the bypass valve flow capacity value can be calculated based on the flow capacity curve, which can improve the accuracy of determining the bypass valve flow capacity, and then the opening degree of the bypass valve can be accurately controlled to prevent closed-loop saturation, thereby improving the control accuracy of the engine air system.

[0081] In another embodiment, a method for determining the flow capacity of a bypass valve is provided, which is applied to a bypass valve flow control system, the system comprising a bypass valve, a driving member and an actuator, the actuator comprising a spring; the method comprising:

[0082] The first pressure correction data and the first pressure data are processed by calculation to obtain the pre-valve pressure data; the second pressure correction data and the second pressure data are processed by calculation to obtain the post-valve pressure data.

[0083] The valve front pressure data and the valve rear pressure data are subjected to difference processing to obtain the target valve pressure data; the valve plate thrust is calculated based on the target valve pressure data and the force correction coefficient.

[0084] The execution correction coefficient is obtained based on the mechanical parameters of the actuator obtained in advance; the pressure data of the driving component is obtained, and the driving force of the driving component is determined based on the pressure data and the execution correction coefficient; the spring force data is determined based on the driving force of the driving component, the valve plate thrust and the preload force of the spring obtained in advance.

[0085] Obtain a spring-related stiffness curve, and determine the spring displacement coefficient based on the stiffness curve; perform calculations on the displacement coefficient and the spring force data to obtain the spring displacement corresponding to the spring force data.

[0086] According to the valve opening curve related to the bypass valve, the angle coefficient related to the bypass valve is determined, and the opening angle of the bypass valve is calculated based on the angle coefficient and the spring displacement; according to the flow capacity curve related to the bypass valve, the flow coefficient related to the bypass valve is determined, and the flow capacity value of the bypass valve is calculated based on the flow coefficient and the opening angle of the bypass valve.

[0087] In an exemplary embodiment, as shown in FIG4 , a bypass valve flow capacity determination system 10 is provided, which is applicable to a bypass valve flow capacity determination method, and the system includes: an engine 30, a control device 100, a bypass valve 200, a drive member 300, an actuator 400, a supercharger 500, a post-treatment system 600, a measuring device, an intake pipe 14, an exhaust manifold 15, and an exhaust manifold 16. The measuring device includes an exhaust manifold pressure sensor 11, a DPF pressure difference sensor 12, and a SCR pre-pressure sensor 13.

[0088] The engine 30 is connected to the intake pipe 14 and the exhaust manifold 16 respectively, and is controlled by the control device 100. The supercharger 500 is connected to the intake pipe 14, the exhaust manifold 15 and the exhaust manifold 16 respectively. The actuator 400 of the supercharger 500 is installed on the supercharger 500. The driving member 300 provides compressed air to the actuator 400 of the supercharger bypass valve and is controlled by the control device 100. The aftertreatment system 600 is connected to the exhaust manifold 15.

[0089] In the previous exemplary embodiment, the pressure data includes first pressure data and second pressure data; the system further includes an exhaust manifold, on which a first pressure sensor is disposed, and the first pressure sensor is used to collect the first pressure data.

[0090] Exemplarily, the first pressure sensor is an exhaust manifold pressure sensor 11, which is mounted on the exhaust manifold 16 and connected to the control device 100 via a signal line for transmitting collected pressure data to the control device 100.

[0091] In the previous exemplary embodiment, the system further includes a post-processing unit, on which a second pressure sensor is provided, and the second pressure sensor is used to collect second pressure data.

[0092] The second pressure sensor includes a DPF pressure difference sensor 12 and a SCR pre-pressure sensor 13. The DPF pressure difference sensor 12 and the SCR pre-pressure sensor 13 are installed on the post-treatment system 600, and the DPF pressure difference sensor 12 and the SCR pre-pressure sensor 13 are connected to the control device 100 through a signal line, so as to transmit the collected pressure data to the control device 100.

[0093] In an exemplary embodiment, the structural block diagram of the control device 100 is shown in FIG5 , and the control device 100 includes:

[0094] A valve pressure determination module 102, configured to obtain pressure data related to the bypass valve, and determine valve pressure data according to the pressure data and the first pressure correction data and the second pressure correction data;

[0095] The thrust determination module 104 is used to determine valve plate parameters of the bypass valve, determine a force correction coefficient according to the valve plate parameters, and determine the valve plate thrust according to the valve pressure data and the force correction coefficient;

[0096] The displacement determination module 106 is used to determine the spring force data according to the valve plate thrust, and determine the spring displacement corresponding to the spring force data;

[0097] The flow capacity determination module 108 is used to obtain a valve opening curve and a flow capacity curve related to the bypass valve, and determine the flow capacity value of the bypass valve according to the valve opening curve, the flow capacity curve and the spring displacement.

[0098] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0099] Each module in the control device 100 can be implemented in whole or in part by software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0100] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0101] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments 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 the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0102] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0103] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for determining the flow capacity of a bypass valve, characterized in that: Applied to a bypass valve flow control system, the system includes a bypass valve, a driving member and an actuator, the actuator includes a spring; the method includes: Acquire pressure data related to the bypass valve, and determine valve pressure data according to the pressure data and first pressure correction data and second pressure correction data; Determine valve plate parameters of the bypass valve, determine a force correction coefficient according to the valve plate parameters, and determine valve plate thrust according to the valve pressure data and the force correction coefficient; Determining spring force data according to the valve plate thrust, and determining a spring displacement corresponding to the spring force data; A valve opening curve and a flow capacity curve related to the bypass valve are obtained, and a flow capacity value of the bypass valve is determined according to the valve opening curve, the flow capacity curve and the spring displacement.

2. The method according to claim 1, characterized in that: Determining the spring force data according to the valve plate thrust, and determining the spring displacement corresponding to the spring force data, includes: Obtaining an execution correction coefficient according to the mechanical parameters of the actuator acquired in advance; Acquiring pressure data of the driving member, and determining a driving force of the driving member according to the pressure data and the execution correction coefficient; The spring force data is determined according to the driving force of the driving member, the valve plate thrust, and the preload force of the spring acquired in advance.

3. The method according to claim 2, characterized in that The method further comprises: Obtaining a stiffness curve related to the spring, and determining a displacement coefficient of the spring according to the stiffness curve; The displacement coefficient and the spring force data are processed by calculation to obtain the spring displacement corresponding to the spring force data.

4. The method according to claim 1, characterized in that: The step of obtaining a valve opening curve and a flow capacity curve related to the bypass valve, and determining the flow capacity value of the bypass valve according to the valve opening curve, the flow capacity curve and the spring displacement, includes: Determining an angle coefficient related to the bypass valve according to a valve opening curve related to the bypass valve, and calculating an opening angle of the bypass valve according to the angle coefficient and the spring displacement; According to the flow capacity curve related to the bypass valve, the flow coefficient related to the bypass valve is determined, and the flow capacity value of the bypass valve is calculated according to the flow coefficient and the opening angle of the bypass valve.

5. The method according to claim 1, characterized in that The pressure data includes first pressure data and second pressure data, and the valve pressure data includes valve front pressure data and valve rear pressure data; the step of obtaining the pressure data related to the bypass valve and determining the valve pressure data according to the pressure data and the first pressure correction data and the second pressure correction data includes: Performing calculation processing on the first pressure correction data and the first pressure data to obtain the valve front pressure data; The second pressure correction data and the second pressure data are processed by operation to obtain the valve post pressure data.

6. The method according to claim 5, characterized in that The determining of the valve plate thrust according to the valve pressure data and the force correction coefficient comprises: Performing difference processing on the pre-valve pressure data and the post-valve pressure data to obtain target valve pressure data; The valve plate thrust is calculated according to the target valve pressure data and the force correction coefficient.

7. A bypass valve flow capacity determination system, characterized in that: The method for determining the flow capacity of a bypass valve according to any one of claims 1 to 6, wherein the system comprises a control device, and the control device comprises: a valve pressure determination module, configured to obtain pressure data related to the bypass valve, and determine valve pressure data according to the pressure data and the first pressure correction data and the second pressure correction data; A thrust determination module, used to determine valve plate parameters of the bypass valve, determine a force correction coefficient according to the valve plate parameters, and determine the valve plate thrust according to the valve pressure data and the force correction coefficient; A displacement determination module, used to determine spring force data according to the valve plate thrust, and determine a spring displacement corresponding to the spring force data; The flow capacity determination module is used to obtain the valve opening curve and the flow capacity curve related to the bypass valve, and determine the flow capacity value of the bypass valve according to the valve opening curve, the flow capacity curve and the spring displacement.

8. The system according to claim 7, characterized in that The first end of the actuator is connected to the driving member, and the second end of the actuator is connected to the bypass valve, so as to control the opening and closing of the bypass valve.

9. The system according to claim 7, characterized in that The pressure data includes first pressure data and second pressure data; the system further includes an exhaust manifold, on which a first pressure sensor is disposed, and the first pressure sensor is used to collect the first pressure data.

10. The system according to claim 9, characterized in that The system further comprises a post-processing unit, on which a second pressure sensor is disposed, and the second pressure sensor is used to collect the second pressure data.

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