Variable valve system optimization method, device and equipment and storage medium

Abstract

The invention discloses a variable valve system optimization method, device and equipment and a storage medium, and relates to the technical field of engines. The method comprises the following steps: adjusting a variable valve system to be tested to a preset working condition, and obtaining performance index data at a target angle; obtaining a valve system performance index table according to the performance index data and the working condition parameters; looking up a table according to a performance calibration rule, and determining a to-be-dispatched work point; and adjusting the parameters of the control system under the work point until the variable valve system to be tested reaches the performance index so as to complete the overall performance optimization. According to the method, comprehensive performance calibration and optimization are conducted on the variable valve system through a systematic method, combination of external parameters such as the accelerator opening degree, the engine oil temperature and the engine rotating speed under all conditions can be covered, and it is ensured that quick response, accurate control and stable performance can be achieved under various possible working conditions; and the use level of the engine is remarkably improved, and the driving experience is optimized.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a variable valve system optimization method, device, equipment and storage medium. Background Art

[0002] With the rapid development of the global automotive industry, the requirements for engine performance are getting higher and higher, especially in terms of power, economy and environmental protection. In order to meet the increasingly stringent emission standards and consumers' high requirements for driving experience, modern engine technology continues to develop in the direction of higher efficiency and environmental protection. Among them, variable valve timing (VVT) technology is one of the important means to improve engine performance. By adjusting the timing of valve opening and closing to optimize the combustion process, it improves the working efficiency and response speed of the engine, while reducing fuel consumption and emission pollution.

[0003] Although VVT technology has played a huge role in improving engine performance, its performance optimization still faces many challenges. The VVT ​​system needs to work under variable working conditions, including different throttle openings, oil temperatures, and engine speeds, all of which will affect the performance of the VVT ​​system. At present, the optimization of most variable valve systems often focuses on improving specific working conditions or local performance, lacking a method that can fully cover various working conditions and achieve overall performance optimization. This results in the VVT ​​system not being able to achieve the expected performance under certain working conditions, affecting the overall efficiency of the engine and the driving experience.

[0004] Therefore, how to achieve comprehensive performance optimization of the variable valve system to ensure that the expected performance level can be achieved under all possible operating conditions has become a technical problem to be solved in this field. Summary of the invention

[0005] The main purpose of this application is to provide a variable valve system optimization method, device, equipment and storage medium, aiming to solve the technical problem of how to achieve comprehensive performance optimization of the variable valve system to ensure that the expected performance level can be achieved under all possible operating conditions.

[0006] To achieve the above object, the present application provides a variable valve system optimization method, the method comprising the following steps: Adjusting the variable valve system to be tested to a preset working condition to obtain performance index data of the variable valve system to be tested at a target control angle; Obtaining a valve system performance index table according to the performance index data at the target control angle and the preset working conditions; Determine the working point to be adjusted according to the valve system performance index table and performance calibration rules; The control system parameters of the variable valve system to be tested at the working point to be adjusted are adjusted until a performance index threshold is reached to complete the performance optimization of the variable valve system to be tested.

[0007] Optionally, adjusting the variable valve system to be tested to a preset working condition to obtain performance index data of the variable valve system to be tested at a target control angle includes: Connecting the variable valve system to be tested to the test bench, setting test parameters so that the variable valve system to be tested operates according to preset working conditions and remains stable, the test parameters including a preset throttle opening, a preset oil temperature, and a preset engine speed; Controlling the variable valve system to be tested to open and close at a target control angle, and recording an opening and closing angle variation curve from when a control instruction is issued to when the variable valve system opens and closes stably; According to the opening and closing angle variation curve, performance index data of the variable valve system to be tested at the target control angle is obtained.

[0008] Optionally, it is characterized in that the obtaining of performance index data of the variable valve system to be tested at a target control angle according to the opening and closing angle variation curve comprises: According to the opening and closing angle variation curve and the target control angle, the valve delay response time, the system response speed, the valve overshoot angle and the steady-state deviation under the preset working condition and the target control angle are obtained; The valve delay response time, system response speed, valve overshoot angle and steady-state deviation are used as the performance indicator data.

[0009] Optionally, the valve system performance index table is obtained according to the performance index data at the target control angle and the preset working condition, including: According to the performance indicator data, a performance data matrix is ​​obtained, and the performance data matrix is ​​used as an index result; According to the preset working condition, determining working condition index items, wherein the working condition index items include throttle opening, oil temperature and engine speed; Determine an opening and closing angle index item according to the target control angle; A valve system performance index table is obtained according to the working condition index items, opening and closing angle index items and index results.

[0010] Optionally, determining the working point to be adjusted according to the valve system performance index table and performance calibration rules includes: Determining static performance indicators according to the performance calibration rules, wherein the static performance indicators include a response delay threshold, an overshoot angle threshold, and a steady-state deviation threshold; Determining a dynamic performance index according to the performance calibration rule and the oil temperature, wherein the dynamic performance index includes a minimum response control speed; The working points in the valve system performance index table that do not meet the static performance index and the dynamic performance index are obtained and used as working points to be adjusted.

[0011] Optionally, adjusting the control system parameters of the variable valve system to be tested at the working point to be adjusted until a performance indicator threshold is reached includes: According to the working point to be adjusted, determining the target operating condition and the target opening and closing angle; The variable valve system to be tested is operated according to the target operating conditions and the target opening and closing angles, and the performance index items that do not meet the performance calibration rules are determined; According to the performance indicator item that does not meet the performance calibration rule, adjusting the control system parameters at the working point to be adjusted, the control system parameters including oil pressure and pulse signal duty cycle; The adjusted variable valve system is re-operated according to the target operating conditions and the target opening and closing angle to obtain a performance indicator item, and the above steps are repeated until the performance indicator item reaches a performance indicator threshold.

[0012] Optionally, the adjusting the control system parameters of the variable valve system to be tested at the working point to be adjusted until a performance indicator threshold is reached further includes: When the work point to be adjusted reaches the performance index threshold, the adjacent work points of the work point to be adjusted are obtained; A performance index check is performed on the adjacent work point. If the adjacent work point does not meet the performance index threshold, the control system parameters under the adjacent work point are adjusted to eliminate the systematic disturbance.

[0013] In addition, to achieve the above-mentioned purpose, the present application also provides a variable valve system optimization device, the variable valve system optimization device comprising: A data acquisition module, used to adjust the variable valve system to be tested to a preset working condition, and obtain performance index data of the variable valve system to be tested at a target control angle; A data processing module, used to obtain a valve system performance index table according to the performance index data under the target control angle and the preset working conditions; The data processing module is further used to determine the working point to be adjusted according to the valve system performance index table and performance calibration rules; The control module is used to adjust the control system parameters of the variable valve system to be tested at the working point to be adjusted until the performance index threshold is reached to complete the performance optimization of the variable valve system to be tested.

[0014] In addition, to achieve the above-mentioned objectives, the present application also provides a variable valve system optimization device, which includes: a memory, a processor, and a variable valve system optimization program stored on the memory and executable on the processor, wherein the variable valve system optimization program is configured to implement the steps of the variable valve system optimization method described above.

[0015] In addition, to achieve the above objectives, the present application also provides a storage medium, on which a variable valve system optimization program is stored. When the variable valve system optimization program is executed by a processor, the steps of the variable valve system optimization method described above are implemented.

[0016] The present application obtains performance index data of the variable valve system to be tested at a target control angle by adjusting the variable valve system to be tested to a preset working condition; obtains a valve system performance index table based on the performance index data at the target control angle and the preset working condition; determines a working point to be adjusted based on the valve system performance index table and performance calibration rules; adjusts control system parameters of the variable valve system to be tested at the working point to be adjusted until a performance index threshold is reached, so as to complete the performance optimization of the variable valve system to be tested.

[0017] In summary, the present application uses a systematic approach to perform comprehensive performance calibration and optimization of the variable valve system, which can cover all combinations of external parameters such as throttle opening, oil temperature and engine speed in all situations, ensuring fast response, precise control and stable performance under all possible operating conditions, significantly improving the use level of the engine and optimizing the driving experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 A schematic diagram of a flow chart of a first embodiment of a variable valve system optimization method of the present application; Figure 2 A schematic flow chart of a second embodiment of the variable valve system optimization method of the present application; Figure 3 This is a schematic diagram of the functional modules of the variable valve system optimization device of this application; Figure 4It is a structural diagram of a terminal device in the hardware operating environment involved in the embodiment of the present application.

[0021] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0022] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0023] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0024] It should be noted that the execution subject of this embodiment may be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device capable of realizing the above functions, a variable valve system optimization device, etc. The following takes the variable valve system optimization device as an example to illustrate this embodiment and the following embodiments.

[0025] The present application embodiment provides a variable valve system optimization method, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the present application.

[0026] In this embodiment, the variable valve system optimization method includes: Step S10: adjusting the variable valve system to be tested to a preset working condition, and obtaining performance index data of the variable valve system to be tested at a target control angle.

[0027] It should be noted that since the technical problem to be solved in this application is to achieve comprehensive performance optimization of the variable valve system, that is, various possible working conditions need to be tested to see whether they can achieve the corresponding performance requirements under the working conditions, and each working condition contains two levels of factors. On the one hand, it is the performance of the VVT ​​system when external factors are determined, and on the other hand, it is the performance of the VVT ​​system when the control instructions are determined. The throttle opening, oil temperature and engine speed belong to the former, and the control instructions specifically refer to the angle at which the VVT ​​system needs to open and close. The performance requirements of the VVT ​​system refer to a series of predetermined performance indicators that the system should achieve under these determined working conditions to ensure that the engine can exhibit optimal performance under various operating conditions.

[0028] It is understood that the VVT ​​system refers to the "Variable Valve Timing" system, which is an engine technology used to optimize the intake and exhaust processes of internal combustion engines. The variable valve system controls the timing of valve opening and closing through electronic signals, thereby improving engine efficiency, power output, fuel economy, and reducing emissions. The main functions of the variable valve system include adjusting the opening and closing time of the intake valve and / or exhaust valve according to the operating state of the engine, and increasing the intake volume by adjusting the valve timing at different engine speeds. The timing of valve opening or closing is relative to the position of the crankshaft angle, that is, by precisely controlling this angle, the engine can achieve optimal performance under different working conditions.

[0029] It should be understood that by monitoring the response of the VVT ​​system to the control command, including the process of the valve changing from the initial position to the target angle, this process contains a series of performance indicators that can characterize the precise control level of the VVT ​​system, such as delay threshold, overshoot angle threshold, steady-state deviation threshold and minimum response control speed. The delay threshold refers to the time interval from the issuance of the control command to the start of the VVT ​​system's response. This indicator measures the response speed of the system, that is, how quickly the system can start to execute the control command. The shorter the delay time, the faster the system responds. The overshoot angle threshold refers to the maximum value that the VVT ​​system may exceed the target angle in the process of reaching the target angle. This indicator reflects the stability and control accuracy of the system during the adjustment process. The smaller the overshoot angle threshold, the smaller the fluctuation in the system adjustment process and the higher the control accuracy. The steady-state deviation threshold refers to the deviation between the actual angle and the target angle when the VVT ​​system reaches the target angle and the system is running stably. This indicator measures whether the system can maintain precise angle control after long-term operation. The smaller the steady-state deviation, the better the stability and accuracy of the system control. The minimum response control speed is the average speed required for the VVT ​​system to move from the 10% position to the 90% position of the target angle. This indicator measures the speed performance of the system during the adjustment process, that is, how quickly the system can change from one angle to another. The higher the minimum response control speed, the faster the system adjustment speed.

[0030] Step S20: obtaining a valve system performance index table according to the performance index data at the target control angle and the preset working condition.

[0031] It should be noted that since the external variables related to the working conditions include the throttle opening, oil temperature and engine speed, the actual test is carried out by generating multiple test conditions one by one in a sweeping manner according to a certain step size according to the three external parameters of the variable valve system during operation, and then running the system on the test bench according to the test conditions without changing. After the system is stable, the variable valve system is controlled to execute the target angle instruction. The target angle gradually increases from 0° to 90° in a certain step size, and then falls back to 0°. The difference between the target angle and the actual angle opening and closing execution results after the control instruction is issued is statistically analyzed to obtain the control performance at each target angle. Finally, the data under all working conditions are summarized to obtain the valve system performance index table.

[0032] Step S30: determining the working point to be adjusted according to the valve system performance index table and performance calibration rules.

[0033] It should be noted that the performance calibration rules refer to the performance requirements that the variable valve system must meet under any operating condition. Only when all operating conditions meet this requirement can the variable valve system be considered to have achieved global optimization.

[0034] In one embodiment, determining the working point to be adjusted according to the valve system performance index table and the performance calibration rules includes: determining static performance indicators according to the performance calibration rules, the static performance indicators including a response delay threshold, an overshoot angle threshold and a steady-state deviation threshold; determining dynamic performance indicators according to the performance calibration rules and the engine oil temperature, the dynamic performance indicators including a minimum response control speed; obtaining the working point in the valve system performance index table that does not meet the static performance indicators and the dynamic performance indicators, and using it as the working point to be adjusted.

[0035] Optionally, the performance calibration rule means that for any set valve target opening and closing angle, the actual response delay time of the VVT ​​angle does not exceed 50ms; when VVT regulation overshoots or undershoots occur, the maximum deviation of the overshoot cannot exceed 5% of the VVT ​​maximum rotation angle; when VVT regulation reaches a stable state, the difference between the VVT ​​target angle and the actual angle cannot exceed 2 degrees of crankshaft angle; in addition, since the system response speed is closely related to the engine speed and oil temperature, the system response speed is calculated by dividing the change in the VVT ​​angle from the target angle 10% to 90% by the change time to obtain the average speed. For all speed points with oil temperature below 10 degrees, the response speed is not less than 20° / s, and the response speed is not less than 80° / s above 10 degrees. It should be noted that the system response speed is the only one of the four performance indicators that needs to be combined with external parameters to obtain, and the other three do not require external parameters to intervene.

[0036] It should be understood that the work point to be adjusted refers to those specific working conditions or state points that fail to meet the established performance requirements, identified according to the performance index map and the preset performance calibration rules, during the performance calibration and optimization process of the engine variable valve timing (VVT) system. Since the above performance requirements include four requirements, any one of the requirements that is not met can be regarded as a work point to be adjusted. These work points need to be further adjusted and optimized to ensure that they meet the expected performance standards. In addition, since any work point corresponds to a set of working conditions (external parameters) and execution angles (execution targets), the actual valve system performance index table is at least a two-dimensional data table, and therefore each work point has its corresponding position in the data table, which is determined by a specific combination of working conditions and execution angles.

[0037] Step S40: adjusting the control system parameters of the variable valve system to be tested at the working point to be adjusted until the performance index threshold is reached to complete the performance optimization of the variable valve system to be tested.

[0038] In one embodiment, the control system parameters of the variable valve system to be tested at the working point to be adjusted until the performance index threshold is reached include: determining the target operating condition and the target opening and closing angle according to the working point to be adjusted; operating the variable valve system to be tested according to the target operating condition and the target opening and closing angle, and determining the performance index items that do not meet the performance calibration rules; adjusting the control system parameters at the working point to be adjusted according to the performance index items that do not meet the performance calibration rules, the control system parameters including oil pressure and pulse signal duty cycle; re-operating the adjusted variable valve system according to the target operating condition and the target opening and closing angle to obtain the performance index items, and repeating the above steps until the performance index items reach the performance index threshold.

[0039] It should be noted that the adjustment of control system parameters includes but is not limited to the control logic at the program level such as oil pressure, PWM duty cycle, and timing of electronic control signals set for a certain working point. These parameters directly affect the performance of the variable valve system. Since this process belongs to the debugging process at the digital circuit level, slight disturbances of external factors will cause the debugging content of each working point to be different. The debugging process is result-oriented to a certain extent. Therefore, the actual optimization process only needs to ensure that the control at the current working point can reach the performance index threshold.

[0040] It is understandable that when adjustments are made to a specific work point, there may be a chain reaction or systemic impact on adjacent work points. Therefore, after the adjustment work point has been debugged to meet the standards, preventive measures need to be taken to avoid performance problems that may occur in the future by identifying and verifying adjacent work points in advance.

[0041] In one embodiment, the adjusting of the control system parameters of the variable valve system to be tested at the working point to be adjusted until a performance index threshold is reached also includes: after the working point to be adjusted reaches the performance index threshold, obtaining an adjacent working point of the working point to be adjusted; performing a performance index check on the adjacent working point, and if the adjacent working point does not meet the performance index threshold, adjusting the control system parameters at the adjacent working point to eliminate systematic disturbances.

[0042] It should be understood that such preventive measures can reduce performance fluctuations between operating conditions, ensure a smooth transition from one operating condition to another, and improve the continuity and smoothness of system response.

[0043] The present application obtains performance index data of the variable valve system to be tested at a target control angle by adjusting the variable valve system to be tested to a preset working condition; obtains a valve system performance index table based on the performance index data at the target control angle and the preset working condition; determines a working point to be adjusted based on the valve system performance index table and performance calibration rules; adjusts control system parameters of the variable valve system to be tested at the working point to be adjusted until a performance index threshold is reached, so as to complete the performance optimization of the variable valve system to be tested.

[0044] In summary, the present application uses a systematic approach to perform comprehensive performance calibration and optimization of the variable valve system, which can cover all combinations of external parameters such as throttle opening, oil temperature and engine speed in all situations, ensuring fast response, precise control and stable performance under all possible operating conditions, significantly improving the use level of the engine and optimizing the driving experience.

[0045] Reference Figure 2 , Figure 2 This is a flow chart of the second embodiment of the variable valve system optimization method of the present application. Based on the above-mentioned first embodiment, the second embodiment of the variable valve system optimization method of the present application is proposed.

[0046] In this embodiment, the step S10 includes: Step S101: connecting the variable valve system to be tested to a test bench, and setting test parameters so that the variable valve system to be tested operates according to preset working conditions and remains stable.

[0047] It should be noted that the test bench is used to simulate various operating conditions that the actual engine may encounter in the vehicle. On the test bench, parameters including throttle opening, oil temperature and engine speed need to be set to match the preset operating requirements.

[0048] Step S102: Control the variable valve system to be tested to open and close at a target control angle, and record the opening and closing angle change curve from when the control instruction is issued to when the variable valve system opens and closes stably.

[0049] It should be noted that the opening and closing angle change curve of the variable valve system refers to the graphical representation of the change of the valve opening and closing angle over time in the variable valve timing (VVT) system, from the time the valve receives the control command to the time when the target opening and closing angle is reached and this angle is maintained stably.

[0050] Step S103: acquiring performance index data of the variable valve system to be tested at a target control angle according to the opening and closing angle variation curve.

[0051] It is understandable that the time from the stationary state to the start of the valve action reflects the response speed of the system, and the time required for the valve to reach the target angle reflects the dynamic response performance of the system. If the valve opening and closing angle exceeds the target angle and then returns, it means that the system has overshoot. The length of time the valve reaches the target angle and remains stable shows the stability and control accuracy of the system. By analyzing this curve, it can be ensured that the valve timing system can provide accurate and stable control throughout the entire working range.

[0052] Furthermore, according to the opening and closing angle change curve, performance indicator data of the variable valve system to be tested under the target control angle are obtained, including: according to the opening and closing angle change curve and the target control angle, the valve delay response time, system response speed, valve overshoot angle and steady-state deviation under the preset working condition and the target control angle are obtained; the valve delay response time, system response speed, valve overshoot angle and steady-state deviation are used as the performance indicator data.

[0053] In this embodiment, the step S20 includes: Step S201: Obtain a performance data matrix according to the performance indicator data, and use the performance data matrix as an index result.

[0054] It should be noted that, since the performance indicator data contains more than one item of data, the multiple items of data are organized into a structured matrix form to represent the performance indicator of the work point, which can facilitate rapid retrieval and comparison of performance under different working conditions.

[0055] Step S202: Determine an operating condition index item according to the preset operating condition.

[0056] It should be noted that the working condition index items are based on the parameters of the preset working conditions, such as throttle opening, oil temperature and engine speed, which define the operating state of the engine under specific conditions. Set one or more specific values ​​for each selected parameter, which will be used as working condition index items to identify different test points.

[0057] Step S203: Determine an opening and closing angle index item according to the target control angle.

[0058] It should be noted that the essence of the opening and closing angle is the content of the control instruction. Therefore, the opening and closing angle is different from the operating condition parameters. The opening and closing angle is a command directly issued by the control system, requiring the variable valve system to respond accordingly, while the operating condition parameters such as throttle opening, oil temperature and engine speed are external conditions for the operation of the system, so they need to be treated as a separate index item.

[0059] Step S204: obtaining a valve system performance index table according to the working condition index items, the opening and closing angle index items and the index results.

[0060] It can be understood that by combining the index results in the previous steps with the working condition and angle index items, a complete valve system performance index table containing global working conditions can be formed, providing comprehensive data support for system optimization. This process ensures the systematic and accurate performance evaluation, enabling engineers to effectively identify optimization areas and adjust control system parameters.

[0061] This embodiment provides a variable valve system optimization method. This embodiment first connects the variable valve system to be tested to the test bench, sets the test parameters so that the variable valve system to be tested operates according to the preset working conditions and remains stable; controls the variable valve system to be tested to open and close at the target control angle, and records the opening and closing angle change curve from the time when the control instruction is issued to the time when the variable valve system opens and closes stably; based on the opening and closing angle change curve, obtains the performance index data of the variable valve system to be tested at the target control angle. Based on the performance index data, obtains a performance data matrix, and uses the performance data matrix as an index result; determines the working condition index item based on the preset working condition; determines the opening and closing angle index item based on the target control angle; and obtains a valve system performance index table based on the working condition index item, the opening and closing angle index item, and the index result.

[0062] In summary, through systematic testing and optimization, systemic failures caused by local performance problems are reduced, and the reliability and stability of the engine are enhanced. In addition, the solution helps reduce fuel consumption and emission levels by accurately controlling valve timing, meeting environmental protection requirements. Finally, the solution shortens the engine development cycle and improves market competitiveness by providing comprehensive data support and optimization guidance.

[0063] Reference Figure 3 The present application also provides a variable valve system optimization device, the variable valve system optimization device comprising: The data acquisition module 10 is used to adjust the variable valve system to be tested to a preset working condition and obtain performance index data of the variable valve system to be tested at a target control angle; A data processing module 20, for obtaining a valve system performance index table according to the performance index data at the target control angle and the preset working conditions; The data processing module 20 is also used to determine the working point to be adjusted according to the valve system performance index table and performance calibration rules; The control module 30 is used to adjust the control system parameters of the variable valve system to be tested at the working point to be adjusted until the performance index threshold is reached to complete the performance optimization of the variable valve system to be tested.

[0064] In one embodiment, the data acquisition module 10 is also used to connect the variable valve system to be tested to a test bench, set test parameters so that the variable valve system to be tested operates according to preset working conditions and remains stable, and the test parameters include a preset throttle opening, a preset oil temperature, and a preset engine speed; control the variable valve system to be tested to open and close at a target control angle, and record the opening and closing angle change curve from the time when the control command is issued to the time when the variable valve system opens and closes stably; according to the opening and closing angle change curve, obtain the performance index data of the variable valve system to be tested at the target control angle.

[0065] In one embodiment, the data acquisition module 10 is also used to obtain the valve delay response time, system response speed, valve overshoot angle and steady-state deviation under the preset working conditions and the target control angle according to the opening and closing angle change curve and the target control angle; and the valve delay response time, system response speed, valve overshoot angle and steady-state deviation are used as the performance indicator data.

[0066] In one embodiment, the data processing module 20 is also used to obtain a performance data matrix based on the performance index data, and use the performance data matrix as an index result; determine an operating condition index item based on the preset operating condition, and the operating condition index item includes throttle opening, oil temperature and engine speed; determine an opening and closing angle index item based on the target control angle; and obtain a valve system performance index table based on the operating condition index item, the opening and closing angle index item and the index result.

[0067] In one embodiment, the data processing module 20 is further used to determine static performance indicators according to the performance calibration rules, and the static performance indicators include a response delay threshold, an overshoot angle threshold, and a steady-state deviation threshold; determine dynamic performance indicators according to the performance calibration rules and the oil temperature, and the dynamic performance indicators include a minimum response control speed; obtain the working point in the valve system performance indicator table that does not meet the static performance indicator and the dynamic performance indicator, and use it as the working point to be adjusted.

[0068] In one embodiment, the data processing module 20 is also used to determine the target operating condition and the target opening and closing angle according to the working point to be adjusted; operate the variable valve system to be tested according to the target operating condition and the target opening and closing angle to determine the performance indicator items that do not meet the performance calibration rules; adjust the control system parameters at the working point to be adjusted according to the performance indicator items that do not meet the performance calibration rules, and the control system parameters include oil pressure and pulse signal duty cycle; re-operate the adjusted variable valve system according to the target operating condition and the target opening and closing angle to obtain the performance indicator items, and repeat the above steps until the performance indicator items reach the performance indicator threshold.

[0069] In one embodiment, the data processing module 20 is also used to obtain adjacent work points of the work point to be adjusted after the work point to be adjusted reaches a performance indicator threshold; perform performance indicator verification on the adjacent work points, and if the adjacent work points do not meet the performance indicator threshold, adjust the control system parameters under the adjacent work points to eliminate systematic disturbances.

[0070] An embodiment of the present application also provides a variable valve system optimization device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the variable valve system optimization method in the above-mentioned embodiment one.

[0071] Reference below Figure 4 , which shows a schematic diagram of the structure of a variable valve system optimization device suitable for implementing the embodiment of the present application. The variable valve system optimization device in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle terminals (such as vehicle navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 4 The variable valve system optimization device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0072] like Figure 4As shown, the variable valve system optimization device may include a processing device 1001 (such as a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the variable valve system optimization device are also stored. The processing device 1001, ROM1002 and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the variable valve system optimization device to communicate with other devices wirelessly or by wire to exchange data. Although the figure shows a variable valve system optimization device with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or provided alternatively.

[0073] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0074] The variable valve system optimization device provided by the present application adopts the variable valve system optimization method in the above embodiment, which can solve the technical problem of how to achieve comprehensive performance optimization of the variable valve system in the art to ensure that the expected performance level can be achieved under all possible working conditions. Compared with the prior art, the beneficial effects of the variable valve system optimization device provided by the present application are the same as the beneficial effects of the variable valve system optimization method provided by the above embodiment, and the other technical features of the variable valve system optimization device are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0075] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0076] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0077] The present application also provides a storage medium, on which a variable valve system optimization program is stored. When the variable valve system optimization program is executed by a processor, the steps of the variable valve system optimization method described in any one of the above are implemented.

[0078] The storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM: RandomAccess Memory), a read-only memory (ROM: Read Only Memory), an erasable programmable read-only memory (EPROM: Erasable Programmable Read Only Memory or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM: CD-Read Only Memory), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, system or device. The program code contained on the storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency: Radio Frequency), etc., or any suitable combination of the above.

[0079] The above-mentioned storage medium may be included in the variable valve system optimization device; or may exist independently without being assembled into the variable valve system optimization device.

[0080] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the variable valve system optimization device, the variable valve system optimization device: adjusts the variable valve system to be tested to a preset working condition, and obtains the performance index data of the variable valve system to be tested at the target control angle; obtains a valve system performance index table based on the performance index data at the target control angle and the preset working condition; determines the working point to be adjusted based on the valve system performance index table and the performance calibration rules; adjusts the control system parameters of the variable valve system to be tested at the working point to be adjusted until the performance index threshold is reached, so as to complete the performance optimization of the variable valve system to be tested.

[0081] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0082] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0083] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0084] The storage medium provided in this application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned variable valve system optimization method, and can solve the technical problem of how to achieve comprehensive performance optimization of the variable valve system to ensure that the expected performance level can be achieved under all possible working conditions. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as the beneficial effects of the variable valve system optimization method provided in the above-mentioned embodiment, and will not be repeated here.

[0085] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A variable valve system optimization method, characterized in that: The variable valve system optimization method comprises: Adjusting the variable valve system to be tested to a preset working condition to obtain performance index data of the variable valve system to be tested at a target control angle; Obtaining a valve system performance index table according to the performance index data at the target control angle and the preset working conditions; Determine the working point to be adjusted according to the valve system performance index table and performance calibration rules; The control system parameters of the variable valve system to be tested at the working point to be adjusted are adjusted until a performance index threshold is reached to complete the performance optimization of the variable valve system to be tested.

2. The variable valve system optimization method according to claim 1, characterized in that: The step of adjusting the variable valve system to be tested to a preset working condition and obtaining performance index data of the variable valve system to be tested at a target control angle includes: Connecting the variable valve system to be tested to the test bench, setting test parameters so that the variable valve system to be tested operates according to preset working conditions and remains stable, the test parameters including a preset throttle opening, a preset oil temperature, and a preset engine speed; Controlling the variable valve system to be tested to open and close at a target control angle, and recording an opening and closing angle variation curve from when a control instruction is issued to when the variable valve system opens and closes stably; According to the opening and closing angle variation curve, performance index data of the variable valve system to be tested at the target control angle is obtained.

3. The variable valve system optimization method according to claim 2, characterized in that: The step of obtaining performance index data of the variable valve system to be tested at a target control angle according to the opening and closing angle variation curve includes: According to the opening and closing angle variation curve and the target control angle, the valve delay response time, the system response speed, the valve overshoot angle and the steady-state deviation under the preset working condition and the target control angle are obtained; The valve delay response time, system response speed, valve overshoot angle and steady-state deviation are used as the performance indicator data.

4. The variable valve system optimization method according to claim 1, characterized in that: The valve system performance index table is obtained according to the performance index data under the target control angle and the preset working conditions, including: According to the performance indicator data, a performance data matrix is ​​obtained, and the performance data matrix is ​​used as an index result; According to the preset working condition, determining working condition index items, wherein the working condition index items include throttle opening, oil temperature and engine speed; Determine an opening and closing angle index item according to the target control angle; A valve system performance index table is obtained according to the working condition index items, opening and closing angle index items and index results.

5. The variable valve system optimization method according to claim 1, characterized in that: Determining the working point to be adjusted according to the valve system performance index table and performance calibration rules includes: Determining static performance indicators according to the performance calibration rules, wherein the static performance indicators include a response delay threshold, an overshoot angle threshold, and a steady-state deviation threshold; Determining a dynamic performance index according to the performance calibration rule and the oil temperature, wherein the dynamic performance index includes a minimum response control speed; The working points in the valve system performance index table that do not meet the static performance index and the dynamic performance index are obtained and used as working points to be adjusted.

6. The variable valve system optimization method according to claim 1, characterized in that: The step of adjusting the control system parameters of the variable valve system to be tested at the working point to be adjusted until a performance indicator threshold is reached includes: According to the working point to be adjusted, determining the target operating condition and the target opening and closing angle; The variable valve system to be tested is operated according to the target operating conditions and the target opening and closing angles, and the performance index items that do not meet the performance calibration rules are determined; According to the performance indicator item that does not meet the performance calibration rule, adjusting the control system parameters at the working point to be adjusted, the control system parameters including oil pressure and pulse signal duty cycle; The adjusted variable valve system is re-operated according to the target operating conditions and the target opening and closing angle to obtain a performance indicator item, and the above steps are repeated until the performance indicator item reaches a performance indicator threshold.

7. The variable valve system optimization method according to claim 1, characterized in that: The step of adjusting the control system parameters of the variable valve system to be tested at the working point to be adjusted until the performance index threshold is reached further includes: When the work point to be adjusted reaches the performance index threshold, the adjacent work points of the work point to be adjusted are obtained; A performance index check is performed on the adjacent work point. If the adjacent work point does not meet the performance index threshold, the control system parameters under the adjacent work point are adjusted to eliminate the systematic disturbance.

8. A variable valve system optimization device, characterized in that: The variable valve system optimization device comprises: A data acquisition module, used to adjust the variable valve system to be tested to a preset working condition, and obtain performance index data of the variable valve system to be tested at a target control angle; A data processing module, used to obtain a valve system performance index table according to the performance index data under the target control angle and the preset working conditions; The data processing module is further used to determine the working point to be adjusted according to the valve system performance index table and performance calibration rules; The control module is used to adjust the control system parameters of the variable valve system to be tested at the working point to be adjusted until the performance index threshold is reached to complete the performance optimization of the variable valve system to be tested.

9. A variable valve system optimization device, characterized in that: The variable valve system optimization device includes: a memory, a processor, and a variable valve system optimization program stored in the memory and executable on the processor, wherein the variable valve system optimization program is configured to implement the steps of the variable valve system optimization method as described in any one of claims 1 to 7.

10. A storage medium, characterized in that: The storage medium stores a variable valve system optimization program, and when the variable valve system optimization program is executed by the processor, the steps of the variable valve system optimization method according to any one of claims 1 to 7 are implemented.

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