Turbocharging system and electric pressure regulating valve fault diagnosis method and device

Abstract

The invention provides a turbocharging system and an electric pressure regulating valve fault diagnosis method and device, and belongs to the field of engines. The system comprises a high-pressure gas cylinder, an electromagnetic isolation valve, a to-be-tested electrical pressure regulating valve, a pressure sensor and a controller, the high-pressure gas cylinder is used for generating a high-pressure gas source, the electromagnetic isolation valve is installed on a pipeline between an outlet of the high-pressure gas cylinder and the to-be-tested electrical pressure regulating valve, and the electromagnetic isolation valve is far away from the to-be-tested electrical pressure regulating valve and close to the high-pressure gas cylinder; the pressure sensor is installed in a pipeline between the electromagnetic isolation valve and the to-be-tested electrical pressure regulating valve. And the controller is electrically connected with the electromagnetic isolation valve and the pressure sensor and is used for determining whether the to-be-tested electrical pressure regulating valve fails at least according to the state of the engine, the opening and closing state of the electromagnetic isolation valve and a pressure change value detected by the pressure sensor, and the state of the engine is a shutdown state or an operation state. According to the scheme, the problem of low fault diagnosis efficiency of the electrical pressure regulating valve in the prior art is solved.

Description

Technical Field

[0001] This application relates to the field of engines, and more particularly, to a turbocharging system, an electrical pressure regulating valve fault diagnosis method, an electrical pressure regulating valve fault diagnosis device, and a computer-readable storage medium. Background Art

[0002] The electrical pressure regulating valve is a key component in the turbocharging system of a diesel engine (or gas engine), mainly used to precisely control the boost pressure to optimize engine performance, fuel economy, and emissions. The high-pressure gas in the high-pressure gas cylinder is modulated by the electrical pressure regulating valve, and the modulated high-pressure gas controls the opening and closing of the wastegate valve of the turbocharger. There is a solenoid valve inside the electrical pressure regulating valve, and the ECU adjusts the solenoid valve to reasonably distribute the high-pressure gas between the working port and the exhaust port to achieve the modulation target. However, the electrical pressure regulating valve often fails, resulting in air leakage, which in turn can cause a series of vehicle faults.

[0003] Existing electrical pressure regulating valve fault diagnoses are mostly manual, relying on visual inspection and unable to accurately detect, especially when the engine is running, various noises are mixed, and the fault detection rate is extremely low. Summary of the Invention

[0004] The main objective of this application is to provide a turbocharging system, an electrical pressure regulating valve fault diagnosis method, an electrical pressure regulating valve fault diagnosis device, and a computer-readable storage medium to at least solve the problem of low efficiency in diagnosing electrical pressure regulating valve faults in the prior art.

[0005] To achieve the above objective, according to one aspect of this application, a turbocharging system is provided, including: a high-pressure gas cylinder, an electromagnetic isolation valve, a to-be-tested electrical pressure regulating valve, a pressure sensor, and a controller. Among them, the high-pressure gas cylinder is used to generate a high-pressure gas source, the electromagnetic isolation valve is installed on the pipeline between the outlet of the high-pressure gas cylinder and the to-be-tested electrical pressure regulating valve, and the electromagnetic isolation valve is far from the to-be-tested electrical pressure regulating valve and close to the high-pressure gas cylinder; the pressure sensor is installed in the pipeline between the electromagnetic isolation valve and the to-be-tested electrical pressure regulating valve; the controller is electrically connected to the electromagnetic isolation valve and the pressure sensor, and is used to determine whether the to-be-tested electrical pressure regulating valve is faulty at least according to the state of the engine, the opening and closing state of the electromagnetic isolation valve, and the pressure change value detected by the pressure sensor, and the state of the engine is a shutdown state or a running state.

[0006] Optionally, the turbocharging system further includes a turbocharger, and the turbocharger is connected to the working port of the to-be-tested electrical pressure regulating valve.

[0007] According to another aspect of the present application, a method for diagnosing faults of an electric pressure regulating valve is provided. The method is applied to a controller in the turbocharging system and includes: determining whether the state of the engine is a shutdown state or an operating state; in the case where the engine is in the shutdown state, determining the leakage rate of the electric pressure regulating valve to be measured based on the opening and closing state of the electromagnetic isolation valve and the pressure change value detected by the pressure sensor, and determining a first fault diagnosis score according to the leakage rate of the electric pressure regulating valve to be measured; in the case where the engine is in the operating state, determining the boost pressure frequency deviation ratio based on the boost pressure frequency of the high-pressure gas cylinder, and determining a second fault diagnosis score according to the boost pressure frequency deviation ratio; and determining whether the electric pressure regulating valve to be measured is faulty based on the first fault diagnosis score and the second fault diagnosis score.

[0008] Optionally, in the case where the engine is in the shutdown state, determining the leakage rate of the electric pressure regulating valve to be measured based on the opening and closing state of the electromagnetic isolation valve and the pressure change value detected by the pressure sensor, and determining a first fault diagnosis score according to the leakage rate of the electric pressure regulating valve to be measured, includes: in the case where the engine is in the shutdown state and the pressure of the high-pressure gas cylinder is greater than a preset pressure value, controlling the solenoid valve of the electric pressure regulating valve to be measured to close, and after the solenoid valve of the electric pressure regulating valve to be measured is closed for a first preset time period, controlling the electromagnetic isolation valve to close, wherein the pressure of the high-pressure gas cylinder is measured by an internal pressure sensor installed inside the high-pressure gas cylinder, and the first preset time period is calibrated according to the pipeline volume between the electromagnetic isolation valve and the electric pressure regulating valve to be measured; monitoring the pressure value detected by the pressure sensor within a second preset time period, and calculating the leakage rate within the second preset time period according to the pressure value; and mapping the leakage rate to the first fault diagnosis score according to a first preset mapping rule, wherein the first preset mapping rule includes the leakage rate and the fault diagnosis score corresponding to the leakage rate, and the leakage rate and the fault diagnosis score corresponding to the leakage rate are negatively correlated.

[0009] Optionally, in the case where the engine is in the operating state, determining the boost pressure frequency deviation ratio based on the boost pressure frequency of the high-pressure gas cylinder, and determining a second fault diagnosis score according to the boost pressure frequency deviation ratio, includes: in the case where the engine is in the operating state, obtaining in real time the boost pressure frequency of the high-pressure gas cylinder within a third preset time period; using the formula to calculate the boost pressure frequency deviation ratio within the third preset time period, where is the boost pressure frequency deviation ratio, is the boost pressure frequency of the high-pressure gas cylinder within the third preset time period, The supplementary pressure frequency for model prediction; according to the second preset mapping rule, map the supplementary pressure frequency deviation ratio to the second fault diagnosis score, where the second preset mapping rule includes the supplementary pressure frequency deviation ratio and the corresponding fault diagnosis score of the supplementary pressure frequency deviation ratio.

[0010] Optionally, use the formula to calculate the supplementary pressure frequency deviation ratio within the third preset time period, where is the supplementary pressure frequency deviation ratio, is the supplementary pressure frequency of the high-pressure gas cylinder within the third preset time period, The model prediction supplementary pressure frequency, including: using the formula to calculate the model prediction supplementary pressure frequency, where is the number of braking times, is the braking depth, is the ambient temperature, is the initial pressure of the high-pressure gas cylinder, , , and are parameters determined based on actual tests and engineering experience.

[0011] Optionally, based on the first fault diagnosis score and the second fault diagnosis score, determine whether the electrical pressure regulating valve to be tested is faulty, including: setting the weight of the first fault diagnosis score to the first weight, and setting the weight of the second fault diagnosis score to the second weight; using the formula to calculate the final fault diagnosis score of the electrical pressure regulating valve to be tested, where is the final fault diagnosis score, is the first fault diagnosis score, is the second fault diagnosis score, is the first weight, is the second weight, where the first weight is greater than the second weight; determine whether the electrical pressure regulating valve to be tested is faulty according to the final fault diagnosis score.

[0012] Optionally, the method further includes: adjusting the first weight and the second weight in real time according to the ambient temperature, and increasing the first weight when the ambient temperature rises.

[0013] According to another aspect of the present application, there is provided an electrical pressure regulating valve fault diagnosis device, including: a first determination unit for determining whether the state of the engine is a shutdown state or an operating state; a second determination unit for, when the engine is in the shutdown state, determining the leakage rate of the electrical pressure regulating valve to be measured based on the opening and closing state of the electromagnetic isolation valve and the pressure change value detected by the pressure sensor, and determining a first fault diagnosis score according to the leakage rate of the electrical pressure regulating valve to be measured; a third determination unit for, when the engine is in the operating state, determining the boost pressure frequency deviation ratio based on the boost pressure frequency of the high-pressure gas cylinder, and determining a second fault diagnosis score according to the boost pressure frequency deviation ratio; a fourth determination unit for determining whether the electrical pressure regulating valve to be measured is faulty based on the first fault diagnosis score and the second fault diagnosis score.

[0014] According to still another aspect of the present application, there is provided a computer-readable storage medium, which includes a stored program, wherein when the program runs, it controls the device where the computer-readable storage medium is located to execute any one of the electrical pressure regulating valve fault diagnosis methods.

[0015] Applying the technical solution of the present application, the turbocharging system includes a high-pressure gas cylinder, an electromagnetic isolation valve, an electrical pressure regulating valve to be measured, a pressure sensor, and a controller. Among them, the high-pressure gas cylinder is used to generate a high-pressure gas source. The electromagnetic isolation valve is installed on the pipeline between the outlet of the high-pressure gas cylinder and the electrical pressure regulating valve to be measured. The electromagnetic isolation valve is far from the electrical pressure regulating valve and close to the high-pressure gas cylinder; the pressure sensor is installed in the pipeline between the electromagnetic isolation valve and the electrical pressure regulating valve to be measured; the controller is electrically connected to the electromagnetic isolation valve and the pressure sensor, and is used to determine whether the electrical pressure regulating valve to be measured is faulty at least according to the state of the engine, the opening and closing state of the electromagnetic isolation valve, and the pressure change value detected by the pressure sensor. The state of the engine is a shutdown state or an operating state. In this solution, by adding an electromagnetic isolation valve and a pressure sensor to the gas circuit, the air leakage condition of the electrical pressure regulating valve can be accurately detected. Static diagnosis: Detect the sealing performance of the electrical pressure regulating valve when the engine is in the shutdown state, and evaluate the leakage rate through a pressure decay test; Dynamic diagnosis: When the engine is running, monitor the boost pressure frequency of the high-pressure gas cylinder and combine model prediction to judge the working state of the electrical pressure regulating valve. Combine the static and dynamic diagnosis results to determine whether the electrical pressure regulating valve is faulty, thereby solving the problem of low efficiency in fault diagnosis of electrical pressure regulating valves in the prior art. Description of the Drawings

[0016] The specification drawings constituting a part of the present application are used to provide a further understanding of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0017] Figure 1Shows a schematic structural diagram of a turbocharging system provided in an embodiment of the present application;

[0018] Figure 2 Shows a schematic flowchart of a method for diagnosing faults in an electric pressure regulating valve provided in an embodiment of the present application;

[0019] Figure 3 Shows a structural block diagram of a device for diagnosing faults in an electric pressure regulating valve provided in an embodiment of the present application.

[0020] Among them, the above-mentioned drawings include the following reference numerals:

[0021] 01, turbocharging system; 10, high-pressure gas cylinder; 20, electromagnetic isolation valve; 30, electric pressure regulating valve to be tested; 40, pressure sensor; 50, controller; 301, solenoid valve; 60, supercharger. Detailed implementation manners

[0022] It should be noted that the following detailed description is exemplary and is intended to provide further illustration of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0023] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary implementation manners according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprise" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element can be directly on the other element, or there can also be an intermediate element. Moreover, in the specification and claims, when an element is described as being "connected" to another element, the element can be "directly connected" to the other element, or "connected" to the other element through a third element.

[0025] As introduced in the background art, in the prior art, the fault diagnosis of electric pressure regulating valves is mostly based on manual work and cannot be accurately detected. Especially when the engine is running, various noises are mixed, and the fault detection rate is extremely low. To solve the problem of low efficiency in fault diagnosis of electric pressure regulating valves in the prior art, embodiments of the present application provide a turbocharging system, a method for diagnosing faults in an electric pressure regulating valve, a device for diagnosing faults in an electric pressure regulating valve, and a computer-readable storage medium.

[0026] As Figure 1As shown, the turbocharging system 01 includes a high-pressure gas cylinder 10, an electromagnetic isolation valve 20, an electrical pressure regulating valve 30 to be tested, a pressure sensor 40, and a controller 50. Among them, the high-pressure gas cylinder 10 is used to generate a high-pressure gas source. The electromagnetic isolation valve 20 is installed on the pipeline between the outlet of the high-pressure gas cylinder 10 and the electrical pressure regulating valve 30 to be tested. The electromagnetic isolation valve 20 is far from the electrical pressure regulating valve 30 to be tested and close to the high-pressure gas cylinder 10. The pressure sensor 40 is installed in the pipeline between the electromagnetic isolation valve 20 and the electrical pressure regulating valve 30 to be tested. The controller 50 is electrically connected to the electromagnetic isolation valve 20 and the pressure sensor 40, and is used to determine whether the electrical pressure regulating valve 30 to be tested is faulty at least according to the state of the engine, the opening and closing state of the electromagnetic isolation valve 20, and the pressure change value detected by the pressure sensor 40. The state of the engine is a shutdown state or an operating state.

[0027] Specifically, the high-pressure gas cylinder refers to a container in the turbocharging system for storing high-pressure gas, usually compressed air. As one of the important energy sources of the turbocharging system, the high-pressure gas cylinder provides the high-pressure gas (high-pressure gas source) for driving the supercharging process, which is crucial for engine performance optimization, fuel economy, and emission control. The electromagnetic isolation valve is installed on the pipeline between the outlet of the high-pressure gas cylinder and the electrical pressure regulating valve. Its position is designed such that the electromagnetic isolation valve is far from the electrical pressure regulating valve and close to the high-pressure gas cylinder. Such an arrangement is conducive to forming a closed test area during fault diagnosis, facilitating the accurate measurement of gas pressure changes. The function of the electromagnetic isolation valve is to open or close under the command of the controller, controlling the flow of high-pressure gas, so as to isolate the electrical pressure regulating valve and other system components during fault diagnosis and create a stable environment for testing.

[0028] The electrical pressure regulating valve to be tested is responsible for regulating the pressure of the high-pressure gas flowing in from the high-pressure gas cylinder to meet the requirements of engine operation. The health status of the electrical pressure regulating valve directly affects the performance and safety of the entire system. Therefore, it is necessary to accurately and effectively diagnose its faults. The pressure sensor is installed in the pipeline between the electromagnetic isolation valve and the electrical pressure regulating valve to be tested. This pressure sensor is a high-precision pressure sensor, which is used to monitor the pressure change of the high-pressure gas in the pipeline in real time. During the fault diagnosis process, the data of the pressure sensor is an important basis for judging whether there is leakage or fault in the electrical pressure regulating valve to be tested.

[0029] The controller, through its electrical connections with the electromagnetic isolation valve and the pressure sensor, can receive pressure data from the pressure sensor and control the opening and closing of the electromagnetic isolation valve. The core function of the controller is to conduct fault diagnosis on the electrical pressure regulating valve to be tested based on the operating state of the engine (shutdown or running), the opening and closing state of the electromagnetic isolation valve, and the pressure change value detected by the pressure sensor. This means that the controller can intelligently determine whether there are problems such as poor sealing or air leakage in the electrical pressure regulating valve to be tested.

[0030] By integrating the above components, the above turbocharging system can automatically conduct fault diagnosis on the electrical pressure regulating valve to be tested without manual intervention, significantly improving the self-monitoring ability of the turbocharging system and the efficiency of maintenance management. The dynamic and static combined fault diagnosis strategy adopted by the turbocharging system can not only indirectly judge the state of the electrical pressure regulating valve to be tested by monitoring the pressure compensation frequency during engine operation, but also conduct a direct leakage rate test when the engine is shutdown, thus achieving fault diagnosis covering all operating conditions, improving the accuracy and reliability of fault detection, and solving the problem of low efficiency in fault diagnosis of electrical pressure regulating valves in the prior art.

[0031] Furthermore, as Figure 1 shown, the above turbocharging system 01 further includes a supercharger 60, and the supercharger 60 is connected to the working port of the electrical pressure regulating valve 30 to be tested.

[0032] Specifically, in the turbocharging system, the working principle of the supercharger is to utilize the waste gas energy of the engine to drive the turbine, and the turbine then drives the compressor coaxial with it to compress the air and send it into the intake system of the engine, thereby increasing the intake pressure. This helps to increase the output power of the engine and improve fuel efficiency. Especially in heavy commercial vehicles and high-performance cars, the use of superchargers is very common. The electrical pressure regulating valve to be tested adjusts the pressure of the high-pressure gas to ensure that the supercharger can work stably and efficiently. The working port of the electrical pressure regulating valve to be tested is connected to the intake end of the supercharger. The electrical pressure regulating valve indirectly controls the supercharging degree of the supercharger by adjusting the pressure of the output gas, thereby optimizing the performance of the engine.

[0033] The electrical pressure regulating valve to be tested plays a key role in regulating the air pressure during the operation of the supercharger, and the normal operation of the supercharger depends on the accurate operation of the electrical pressure regulating valve to be tested. This setting can accurately control the gas pressure entering the supercharger, thereby optimizing the engine performance.

[0034] This application also provides a method for fault diagnosis of an electrical pressure regulating valve. The above method is applied to any one of the above engine supercharging systems for regulating intake pressure. Figure 2 It is a schematic flowchart of the method for fault diagnosis of an electrical pressure regulating valve according to an embodiment of this application. As Figure 2 shown, the method includes the following steps:

[0035] Step S201: Determine whether the engine is in a stopped state or a running state.

[0036] Specifically, it is first necessary to determine whether the engine is currently stationary (stopped state) or in operation (running state). The state judgment of the engine is crucial for adopting different fault diagnosis strategies because the fault manifestation forms of the electrical pressure regulating valve are different in the stationary and running states. The state of the engine is judged by the engine speed. When the engine speed is 0 rpm, it is determined that the engine is in the stopped state.

[0037] By distinguishing the running state of the engine, the pertinence and accuracy of fault diagnosis are improved, and misjudgment or invalid results that may be brought about by testing under inappropriate conditions are avoided. In particular, it is ensured that the static test is carried out when the engine is stopped and the system is stationary. At this time, the external interference is the smallest, and the most accurate pressure change data can be obtained, effectively detecting whether there is a leakage problem with the electrical pressure regulating valve. On the other hand, the dynamic test is carried out when the engine is running and the system pressure changes frequently, which can monitor the dynamic performance of the electrical pressure regulating valve to be tested in real time and timely detect signs of control failure or abnormal pressure replenishment. In short, by accurately judging the engine state, it provides a key condition basis for the fault diagnosis of the electrical pressure regulating valve to be tested in the stopped and running states, ensuring the effectiveness of the test and the accuracy of the diagnosis, and is the key basis for realizing intelligent and efficient fault detection in the entire fault diagnosis method.

[0038] Step S202: When the engine is in the above-mentioned stopped state, determine the leakage rate of the electrical pressure regulating valve to be tested based on the opening and closing state of the electromagnetic isolation valve and the pressure change value detected by the pressure sensor, and determine the first fault diagnosis score according to the above-mentioned leakage rate of the electrical pressure regulating valve to be tested.

[0039] Specifically, when the engine is in the stopped state, control the electromagnetic isolation valve to close, thereby isolating the pipeline part between the high-pressure gas cylinder and the electrical pressure regulating valve to be tested, forming a closed gas test environment. Subsequently, monitor the pressure change detected by the pressure sensor in this closed environment. If the gas pressure drops within a certain period of time, it indicates that there may be a leakage in the electrical pressure regulating valve to be tested. By calculating the leakage rate (the amount of pressure change per unit time), the leakage degree of the electrical pressure regulating valve to be tested can be quantified, and then the first fault diagnosis score is determined according to the leakage rate. The first fault diagnosis score reflects the fault state of the electrical pressure regulating valve under static conditions.

[0040] When the engine is in the shutdown state, by controlling the opening and closing of the electromagnetic isolation valve and monitoring the pressure change value of the pressure sensor, the accurate measurement of the leakage rate of the electrical pressure regulating valve to be tested is achieved, and further the leakage rate is converted into the first fault diagnosis score, which is used as the fault diagnosis basis under static conditions. The key to this process is that by closing the electromagnetic isolation valve, a closed test environment can be created to isolate external interference, enabling the focus on the performance evaluation of the electrical pressure regulating valve to be tested. At the same time, the application of a high-precision pressure sensor ensures the accurate acquisition of the pressure change value, thus providing reliable data support.

[0041] Step S203, in the case where the engine is in the above operating state, determine the boost pressure frequency deviation ratio based on the boost pressure frequency of the high-pressure gas cylinder, and determine the second fault diagnosis score according to the above boost pressure frequency deviation ratio;

[0042] Specifically, when the engine is in the operating state, the electrical pressure regulating valve to be tested should work properly, and the pressure of the high-pressure gas cylinder is controlled to ensure the stable operation of the supercharger. By continuously monitoring the boost pressure frequency of the high-pressure gas cylinder (i.e., the frequency at which the gas cylinder replenishes gas to the system) and comparing it with the model-predicted boost pressure frequency based on vehicle operating parameters (such as braking frequency, braking depth, ambient temperature, etc.), the boost pressure frequency deviation ratio can be calculated. The boost pressure frequency deviation ratio reveals the difference between the actual boost pressure and the expected boost pressure, indicating the working efficiency of the electrical pressure regulating valve to be tested under dynamic conditions. Determine the second fault diagnosis score according to the boost pressure frequency deviation to evaluate the dynamic performance of the electrical pressure regulating valve to be tested.

[0043] When the engine is in the operating state, by continuously monitoring and analyzing the boost pressure frequency of the high-pressure gas cylinder, the boost pressure frequency deviation ratio is determined and converted into the second fault diagnosis score to measure the dynamic performance of the electrical pressure regulating valve. It can actively adapt to the dynamic environment during engine operation. By comparing the actual boost pressure frequency with the ideal boost pressure frequency predicted based on operating parameters such as the number of brakes, braking depth, ambient temperature, and the initial pressure of the gas cylinder, the control efficiency and response speed of the electrical pressure regulating valve to be tested are evaluated in real time. The introduction of this dynamic diagnosis method significantly improves the real-time performance and sensitivity of fault detection. Especially in the face of a complex and changing operating environment, it can quickly capture the subtle changes in the performance fluctuations of the electrical pressure regulating valve to be tested, avoiding potential safety hazards and economic losses caused by the sudden failure of the electrical pressure regulating valve.

[0044] Step S204, based on the above first fault diagnosis score and the above second fault diagnosis score, determine whether the electrical pressure regulating valve to be tested is faulty.

[0045] Specifically, the first fault diagnosis score (leakage score under static conditions) is combined with the second fault diagnosis score (boost pressure frequency deviation score under dynamic conditions), and a comprehensive fault diagnosis score is obtained through weighted summation. Based on the level of this comprehensive score, the overall health status of the electric pressure regulating valve can be judged to determine whether there is a fault.

[0046] By comprehensively considering the fault diagnosis scores under static and dynamic conditions and through weighted analysis, the health status of the electric pressure regulating valve to be tested is comprehensively evaluated, and then it can be accurately determined whether there is a fault. This process effectively combines the fault information obtained under different operating states, ensuring the comprehensiveness and reliability of the diagnosis results. By comprehensively analyzing the first fault diagnosis score (leakage rate score under static conditions) and the second fault diagnosis score (boost pressure frequency deviation ratio score under dynamic conditions), a final fault diagnosis score can be calculated according to the preset weight allocation. This comprehensive evaluation mechanism overcomes the limitations that may exist in a single test. For example, static tests may ignore performance changes during dynamic operation, while dynamic tests may misjudge faults under static conditions. That is, the final fault diagnosis score is a comprehensive fault judgment based on the performance of the electric pressure regulating valve to be tested in the shutdown and operating states.

[0047] This fault diagnosis method provides a comprehensive and intelligent fault detection solution by combining the performance evaluations of the electric pressure regulating valve to be tested under static and dynamic conditions. It not only directly evaluates the sealing performance of the electric pressure regulating valve to be tested through a pressure decay test when the engine is shut down, but also indirectly evaluates the control accuracy and overall efficiency of the electric pressure regulating valve to be tested by real-time monitoring and analyzing the boost pressure frequency when the engine is running. Through this method, the turbocharging system can timely detect potential problems of the electric pressure regulating valve to be tested, avoiding problems such as engine performance degradation, increased fuel consumption, and excessive emissions caused by the failure of the electric pressure regulating valve to be tested, thus ensuring the reliability and operating efficiency of the system. At the same time, this method reduces the dependence on manual maintenance and improves the automation level and accuracy of fault diagnosis.

[0048] In the specific implementation process, when the above-mentioned engine is in the above-mentioned shutdown state, the leakage rate of the electrical pressure regulating valve to be tested is determined based on the opening and closing state of the electromagnetic isolation valve and the pressure change value detected by the pressure sensor, and the first fault diagnosis score is determined according to the above-mentioned leakage rate of the electrical pressure regulating valve to be tested, including: when the above-mentioned engine is in the above-mentioned shutdown state and the pressure of the above-mentioned high-pressure gas cylinder is greater than the preset pressure value, controlling the solenoid valve of the above-mentioned electrical pressure regulating valve to be tested to close, and after the above-mentioned solenoid valve of the above-mentioned electrical pressure regulating valve to be tested is closed for the first preset time period, controlling the above-mentioned electromagnetic isolation valve to close, wherein the pressure of the above-mentioned high-pressure gas cylinder is measured by an internal pressure sensor installed inside the above-mentioned high-pressure gas cylinder, and the above-mentioned first preset time period is calibrated according to the pipeline volume between the above-mentioned electromagnetic isolation valve and the above-mentioned electrical pressure regulating valve to be tested; monitoring the pressure value detected by the above-mentioned pressure sensor within the second preset time period, and calculating the above-mentioned leakage rate within the above-mentioned second preset time period according to the above-mentioned pressure value; mapping the above-mentioned leakage rate to the above-mentioned first fault diagnosis score according to the first preset mapping rule, wherein the above-mentioned first preset mapping rule includes the above-mentioned leakage rate and the fault diagnosis score corresponding to the above-mentioned leakage rate, and the above-mentioned leakage rate and the fault diagnosis score corresponding to the above-mentioned leakage rate have a negative correlation relationship.

[0049] Specifically, when the engine is in the shutdown state and the pressure of the high-pressure gas cylinder is greater than the preset pressure value, first close the solenoid valve 301 in the electrical pressure regulating valve 30 to be tested (see Figure 1 ), and then delay for a period of time (the first preset time period), and then close the electromagnetic isolation valve. The purpose of this operation is to form a closed test space between the high-pressure gas cylinder and the electrical pressure regulating valve to be tested, and the amount of gas contained therein (i.e., the gas in the pipeline volume) is fixed when the electromagnetic isolation valve is closed. By using the internal pressure sensor to monitor the pressure in the high-pressure gas cylinder in real time, it can ensure that the test is carried out under suitable conditions, that is, the sealing performance of the electrical pressure regulating valve is tested under high pressure. After the electromagnetic isolation valve is closed, enter a silent test stage (the second preset time period), during which the pressure change data fed back by the pressure sensor is continuously monitored. By comparing the pressure values at the start and end of the test, the leakage rate of the gas within the second preset time period can be calculated. The leakage rate is a measure of the amount of gas pressure drop per unit time and reflects the sealing condition of the electrical pressure regulating valve to be tested under static conditions.

[0050] According to the first preset mapping rule, the calculated leakage rate is converted into the first fault diagnosis score. The first preset mapping rule makes a smaller leakage rate correspond to a higher first fault diagnosis score, and a larger leakage rate correspond to a lower first fault diagnosis score. The calculation of the first fault diagnosis score provides a quantitative basis for subsequent fault alarms and maintenance decisions and provides a basis for determining whether the electrical pressure regulating valve to be tested is faulty.

[0051] Through the above process, when the engine is in the shutdown state, by precisely controlling the electromagnetic isolation valve and the solenoid valve of the electrical pressure regulating valve to be tested, and using the data of the pressure sensor, the static sealing performance of the electrical pressure regulating valve to be tested is detected and converted into the first fault diagnosis score. This process provides a scientific and accurate quantitative method for the fault assessment of the electrical pressure regulating valve to be tested, and is a key static test step in the fault diagnosis method, which helps to detect whether there is a leakage problem in the electrical pressure regulating valve to be tested under non-operating conditions, thus playing an important role in system maintenance and fault troubleshooting.

[0052] In some embodiments of the present application, when the engine is in the above operating state, the boost frequency deviation ratio is determined based on the boost frequency of the high-pressure gas cylinder, and the second fault diagnosis score is determined according to the above boost frequency deviation ratio, including: when the engine is in the above operating state, the boost frequency of the high-pressure gas cylinder within a third preset time period is obtained in real time; the formula is used to calculate the boost frequency deviation ratio within the third preset time period, where is the boost frequency deviation ratio, is the boost frequency of the high-pressure gas cylinder within the third preset time period, is the model-predicted boost frequency; according to the second preset mapping rule, the boost frequency deviation ratio is mapped to the second fault diagnosis score, where the second preset mapping rule includes the boost frequency deviation ratio and the corresponding fault diagnosis score of the boost frequency deviation ratio.

[0053] Specifically, when the engine is running, the electrical pressure regulating valve to be tested is also in the working state. At this time, the performance of the electrical pressure regulating valve to be tested can be indirectly evaluated by monitoring the boost frequency of the high-pressure gas cylinder. The boost frequency refers to the number of times the high-pressure gas cylinder needs to be refilled within a third preset time period (such as several minutes or several hours). If there is a leakage or control failure in the electrical pressure regulating valve to be tested, the gas in the high-pressure gas cylinder will be frequently refilled to maintain the system pressure, resulting in an increase in the boost frequency. The boost frequency deviation ratio is calculated by comparing the actual boost frequency with the expected model-predicted boost frequency. The boost frequency deviation ratio reflects the gap between the actual operation and the expected operation, and is an index to measure the performance of the electrical pressure regulating valve to be tested. The model-predicted boost frequency is calculated based on parameters such as engine load, vehicle operating state, and environmental factors through a machine learning model or an empirical formula, and represents the boost frequency of the high-pressure gas cylinder when the electrical pressure regulating valve to be tested operates normally under specific conditions.

[0054] Specifically, the formula is used to calculate the above model-predicted boost frequency, where is the number of braking times, is the braking depth, is the ambient temperature, is the initial pressure of the high pressure gas cylinder, , , and is a parameter determined based on actual tests and engineering experience. Through the above formula, it is possible to dynamically predict the reasonable re-pressurization frequency of the high-pressure gas cylinder according to the real-time operating data during the operation of the vehicle, thereby laying a solid foundation for the subsequent comparative analysis with the actual re-pressurization frequency. This embodiment significantly improves the intelligence and accuracy of fault diagnosis. First, it can adapt to changes in the performance of the electric pressure regulating valve under different operating scenarios, and avoids the limitations of relying solely on static data or empirical values by adjusting the predicted frequency in real time. Secondly, by incorporating complex operating parameters into the model, it can automatically identify abnormal behaviors in the process of controlling the high-pressure gas replenishment by the electric pressure regulating valve, and can issue early warnings even in minor faults or early performance degradation stages. Finally, the parameters determined based on actual tests and engineering experience ensure the reliability and applicability of the model prediction, provide a more accurate reference benchmark for the calculation of subsequent fault diagnosis scores, and effectively avoid misdiagnosis and missed diagnosis.

[0055] After calculating the pressure compensation frequency deviation ratio, the next step is to convert it into a fault diagnosis score, namely the second fault diagnosis score, and this process follows the second preset mapping rule. The second preset mapping rule can convert the pressure compensation frequency deviation ratio into an intuitive fault diagnosis score, reflecting the health status of the electrical pressure regulating valve under dynamic operating conditions. Generally, a smaller deviation ratio means that the electrical pressure regulating valve is working properly, and the corresponding fault diagnosis score is higher; conversely, a larger deviation ratio means that the electrical pressure regulating valve may have a fault, and the corresponding fault diagnosis score is lower.

[0056] In summary, in the engine running state, the dynamic performance of the electrical pressure regulating valve to be tested is evaluated by monitoring the pressure replenishment frequency of the high-pressure gas cylinder and calculating the pressure replenishment frequency deviation ratio. By comparing the actual operating data with the expected model, the fault diagnosis of the electrical pressure regulating valve to be tested is carried out in real time and dynamically, which complements the static test. By calculating the pressure replenishment frequency deviation ratio and mapping the fault diagnosis score, the operating status of the electrical pressure regulating valve to be tested can be monitored in real time, which is especially suitable for situations where it is difficult to perform direct physical inspection during engine operation. The performance of the electrical pressure regulating valve to be tested can be indirectly evaluated through data analysis, potential problems can be discovered early, and the safety and reliability of the system can be improved.

[0057] In some other embodiments of the present application, based on the first fault diagnosis score and the second fault diagnosis score, determining whether the electrical pressure regulating valve to be tested is faulty includes: setting the weight of the first fault diagnosis score to a first weight, and setting the weight of the second fault diagnosis score to a second weight; using the formula Calculate the final fault diagnosis score of the above-mentioned electrical pressure regulating valve to be tested. Among them, is the above-mentioned final fault diagnosis score, is the above-mentioned first fault diagnosis score, is the above-mentioned second fault diagnosis score, is the above-mentioned first weight, is the above-mentioned second weight. Among them, the above-mentioned first weight is greater than the above-mentioned second weight; determine whether the above-mentioned electrical pressure regulating valve to be tested is faulty according to the above-mentioned final fault diagnosis score.

[0058] Specifically, in the fault diagnosis of the electrical pressure regulating valve, the leakage situation detected under static conditions (the first fault diagnosis score) can often more directly reflect the sealing performance of the electrical pressure regulating valve than the performance deviation during dynamic operation (the second fault diagnosis score). Therefore, the first weight is usually set to be greater than the second weight. This means that when comprehensively evaluating the health status of the electrical pressure regulating valve to be tested, the score under static conditions has a greater influence. This weight distribution takes into account the direct impact of static test results on driving safety and engine performance, ensuring the ability to prioritize and respond to critical fault modes. By weighted averaging the fault diagnosis scores in two different states, the performance of the electrical pressure regulating valve to be tested under static and dynamic operating conditions is comprehensively considered, and a score (the final fault diagnosis score) that comprehensively reflects its health status is obtained. By setting the first weight to be greater than the second weight, the importance of static test results is emphasized over dynamic test results, because in the static case, the leakage of the electrical pressure regulating valve can directly threaten driving safety and engine stability.

[0059] The final fault diagnosis score is calculated, and according to the preset scoring standard, it is judged whether the electrical pressure regulating valve to be tested has a fault. Usually, a fault threshold is set. If the final fault diagnosis score exceeds the fault threshold, it is considered that the electrical pressure regulating valve to be tested has performance problems or faults and requires further inspection or maintenance. On the contrary, if the final fault diagnosis score does not reach the fault threshold, the electrical pressure regulating valve to be tested is considered to be working normally. This fault determination mechanism based on the final score can quantitatively convert the health status of the electrical pressure regulating valve to be tested into a signal that is easy to understand and operate, providing clear guidance for the vehicle maintenance personnel, thereby improving the maintenance efficiency, reducing the fault time, and ensuring the safe operation of the vehicle and the optimal performance of the engine.

[0060] Furthermore, the above method further includes: adjusting the above-mentioned first weight and the above-mentioned second weight in real time according to the ambient temperature. When the ambient temperature rises, increase the above-mentioned first weight.

[0061] Specifically, the performance of the electrical pressure regulating valve to be tested may be affected by the ambient temperature. Especially in a high-temperature environment, the sealing material may experience increased wear or deformation due to thermal expansion, resulting in a decline in sealing performance and an increased probability of leakage. Therefore, the fault diagnosis of the electrical pressure regulating valve to be tested in a high-temperature environment, especially the leakage test under static conditions, is particularly important. To cope with this environmental change, it is designed to be able to adjust the first weight and the second weight in real time according to the current ambient temperature to reflect the different weights of the fault diagnosis scores under different conditions. When the ambient temperature rises, the weight of the first fault diagnosis score (static test result) is increased because high temperature may accelerate the aging and deformation of the sealing material inside the electrical pressure regulating valve to be tested, thus increasing the risk of seal failure. The static test can more sensitively detect minor leakage changes under such conditions and provide more direct information about the health status of the electrical pressure regulating valve to be tested. By increasing the first weight, it is ensured that in a high-temperature environment, the attention to the sealing performance takes precedence over the performance evaluation during dynamic operation, improving the accuracy and timeliness of fault diagnosis, helping to detect and handle potential sealing problems early, and avoiding greater damage to vehicles or mechanical equipment caused by faults triggered by high temperature.

[0062] By dynamically adjusting the weights of the fault diagnosis scores according to the ambient temperature, the environmental adaptability and reliability of the electrical pressure regulating valve fault diagnosis method are significantly enhanced. It is ensured that in different operating environments, especially under high-temperature conditions, more emphasis can be placed on detecting the sealing performance of the electrical pressure regulating valve to be tested, timely discovering and warning of potential faults, and reducing the performance degradation or even failure caused by high temperature.

[0063] In order to further improve the comprehensiveness and accuracy of the fault diagnosis of the electric pressure regulating valve, this embodiment introduces a fault warning strategy based on multi-modal fusion. This strategy not only includes a fault detection method based on the leakage rate and the deviation ratio of the pressure compensation frequency, but also integrates various sensing means such as sound recognition, vibration analysis, and temperature monitoring. Through multi-dimensional data fusion, multi-modal warning of the faults of the electric pressure regulating valve is realized. Sound recognition module: Using advanced acoustic signal processing technology, it listens to the sound changes in the electric pressure regulating valve and its surrounding area in real time, and identifies abnormal noises that occur during the operation of the electric pressure regulating valve, such as air flow sounds. These abnormal sounds may be early signs of seal failure or other mechanical problems. Vibration analysis module: By installing vibration sensors near the electric pressure regulating valve, its vibration characteristics are continuously monitored. Abnormal vibration modes may indicate the looseness or wear of the internal parts of the electric pressure regulating valve. Especially in the dynamic operation state, vibration analysis can provide additional information about the structural integrity of the electric pressure regulating valve. Temperature monitoring module: In addition to the ambient temperature, the monitoring of the working temperature of the electric pressure regulating valve itself is also added. Abnormal increase or decrease in the working temperature may be a sign of poor internal heat exchange or cooling system failure of the electric pressure regulating valve. These temperature changes will affect the performance and lifespan of the electric pressure regulating valve. Multi-modal data fusion algorithm: Develop an intelligent algorithm that comprehensively analyzes multiple information such as sound, vibration, temperature, leakage rate, and deviation ratio of the pressure compensation frequency. This algorithm can identify the correlation between different modal data, comprehensively analyze the multi-source information, and improve the sensitivity and accuracy of fault warning.

[0064] Through the fault warning strategy based on multi-modal fusion, this embodiment provides a more comprehensive and reliable method for detecting the faults of the electric pressure regulating valve. This method not only utilizes the results of fault diagnosis tests, but also fully considers various abnormal signals during the operation of the electric pressure regulating valve, can identify possible fault modes earlier and more accurately, provides timely warning information for maintenance personnel, effectively prevents system risks caused by the faults of the electric pressure regulating valve, and improves the operation safety and economy of the entire vehicle or mechanical equipment.

[0065] In order to enable those skilled in the art to understand the technical solution of the present application more clearly, the implementation process of the fault diagnosis method of the electric pressure regulating valve of the present application will be described in detail below in combination with specific embodiments.

[0066] This embodiment relates to a specific method for diagnosing faults in an electric pressure regulating valve. Specifically, the electric pressure regulating valve is a key component in the turbocharging system of a diesel engine (or gas engine), mainly used to precisely control the boost pressure to optimize engine performance, fuel economy, and emissions. The working process of the electric pressure regulating valve is as follows: The high-pressure gas (greater than 5 bar) in the high-pressure gas cylinder is modulated by the electric pressure regulating valve, and the modulated high-pressure gas (within the range of 0 - 3 bar) controls the opening and closing of the wastegate valve of the turbocharger. There is a solenoid valve inside the electric pressure regulating valve, and by adjusting the solenoid valve, the high-pressure gas is reasonably distributed between the working port and the exhaust port to achieve the modulation target.

[0067] Install an electromagnetic isolation valve and a high-precision pressure sensor in the gas circuit. The electromagnetic isolation valve is installed between the high-pressure gas cylinder and the electric pressure regulating valve, far from the electric pressure regulating valve end (for example: the pipeline volume between the electromagnetic isolation valve and the electric pressure regulating valve is 2 L) to leave enough inflation space, and the pressure sensor is installed in the pipeline between the electromagnetic isolation valve and the pressure regulating valve.

[0068] 1. Static judgment:

[0069] ① Judge whether the engine is in the shutdown state and whether the pressure of the high-pressure gas cylinder is greater than 5 bar. When the engine speed is 0 rpm, it is determined that the engine is in the shutdown state;

[0070] ② Send a control command to preferentially control the opening of the solenoid valve in the electric pressure regulating valve to 0%;

[0071] ③ After a certain delay (for example, 3 s, which can be calibrated), control the electromagnetic isolation valve to close to form an independent gas circuit (for example, the volume between the electromagnetic isolation valve and the electric pressure regulating valve is 2 L);

[0072] ④ Start the pressure decay test function and continuously monitor the measured change value (leakage rate) of the high-precision pressure sensor;

[0073] ⑤ Linearly map the leakage rate to 0 - 100 points (0.1 - 0.5 bar / h corresponds to 100 - 0 points respectively).

[0074] The real-time performance of static judgment is poor, but the detection rate is relatively high.

[0075] 2. Dynamic judgment:

[0076] ① When the engine is running, continuously count the replenishment pressure frequency of the high-pressure gas cylinder and compare it with the model-predicted replenishment pressure frequency ;

[0077] ② Calculate the deviation ratio of the replenishment pressure frequency (replenishment pressure frequency deviation ratio) within a certain running time;

[0078] ③Map the make-up pressure frequency deviation ratio to a score range of 0 - 100 (0.1 - 0.5 corresponds to 100 - 0 respectively);

[0079] ④The model predicts the make-up pressure frequency Calculated based on parameters such as the braking frequency and braking depth, examples are as follows: , where is the number of brakings, is the braking depth, is the ambient temperature, is the initial pressure of the above-mentioned high-pressure gas cylinder, 、 、 and are parameters determined based on actual tests and engineering experience.

[0080] The dynamic judgment has good real-time performance, but the detection rate is relatively low (there are many interference factors and the model accuracy is poor).

[0081] 3. Final fault diagnosis score and weight allocation:

[0082] ①The final fault diagnosis score = static score * + dynamic score * , the static leakage detection rate is high and directly affects driving safety, and a higher weight is required to ensure timely alarm, for example , where the static score is the first fault diagnosis score, and the dynamic score is the second fault diagnosis score, is the first weight, is the second weight;

[0083] ②Weight coefficient adjustment: If the ambient temperature is relatively high (the thermal expansion of the seal is aggravated and the static detection is more sensitive), the first weight can be increased in real time;

[0084] ③Perform hierarchical error reporting and warning on the final fault diagnosis score, and the warning levels are shown in Table 1.

[0085] Table 1 Warning levels

[0086]

[0087] To improve the forward-looking and intelligent level of the fault diagnosis of the electric pressure regulating valve, this embodiment can perform learning-based fault prediction based on artificial intelligence. By using historical operation data and fault records, through machine learning algorithms such as neural networks, support vector machines, or random forests, a prediction model for the performance degradation of the electric pressure regulating valve is established. This model can identify various early warning signals related to the faults of the electric pressure regulating valve, including slight fluctuations in working pressure, abnormal increases in power consumption, changes in the working cycle, and interactions with environmental factors (such as temperature and humidity). Regularly collect the operation data of the electric pressure regulating valve from the engine ECU, environmental sensors, and other vehicle-mounted sensors, including the time of each operation, pressure changes, power consumption, etc., and perform preprocessing to remove noise and irrelevant information. Through data analysis, extract the characteristic variables closely related to the performance of the electric pressure regulating valve to construct the input parameters of the fault prediction model. These characteristics include the working frequency, duration, environmental temperature, air humidity, oil quality, etc. of the electric pressure regulating valve. Use the labeled fault data to train the model so that it can learn the fault patterns of the electric pressure regulating valve from complex input data. Subsequently, through cross-validation and actual testing, continuously optimize the prediction accuracy of the model to ensure that it can maintain a high accuracy rate under different operating conditions. Once the model is trained and deployed, it can monitor the operating status of the electric pressure regulating valve in real time. By comparing the current data with the model prediction results, it can give early warnings of possible faults. The warning levels can be classified according to the size of the prediction probability, providing an opportunity for the maintenance team to intervene early and perform preventive maintenance.

[0088] By implementing learning-based fault prediction based on artificial intelligence, it is possible to perform predictive diagnosis on the faults of the electric pressure regulating valve, so as to take measures before the faults occur, which not only reduces the risks brought by sudden faults, but also extends the service life of the electric pressure regulating valve, reduces the maintenance cost, and improves the operating efficiency of the overall equipment.

[0089] The embodiment of the present application also provides an electric pressure regulating valve fault diagnosis device. It should be noted that the electric pressure regulating valve fault diagnosis device of the embodiment of the present application can be used to execute the method for diagnosing the faults of the electric pressure regulating valve provided by the embodiment of the present application. This device is used to implement the above-mentioned embodiments and preferred implementation manners, and those that have been described will not be repeated. As used hereinafter, the term "module" can be a combination of software and / or hardware that can achieve a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0090] The following introduces the electric pressure regulating valve fault diagnosis device provided by the embodiment of the present application.

[0091] Figure 3 is the structural block diagram of the electric pressure regulating valve fault diagnosis device according to the embodiment of the present application. AsFigure 3 As shown, the device includes a first determination unit 100, a second determination unit 200, a third determination unit 300, and a fourth determination unit 400. Among them, the first determination unit is used to determine whether the state of the engine is a shutdown state or a running state; the second determination unit is used to, when the engine is in the shutdown state, determine the leakage rate of the electrical pressure regulating valve to be tested based on the opening and closing state of the electromagnetic isolation valve and the pressure change value detected by the pressure sensor, and determine the first fault diagnosis score according to the leakage rate of the electrical pressure regulating valve to be tested; the third determination unit is used to, when the engine is in the running state, determine the boost pressure frequency deviation ratio based on the boost pressure frequency of the high-pressure gas cylinder, and determine the second fault diagnosis score according to the boost pressure frequency deviation ratio; the fourth determination unit is used to determine whether the electrical pressure regulating valve to be tested is faulty based on the first fault diagnosis score and the second fault diagnosis score.

[0092] By combining the performance evaluation of the electrical pressure regulating valve to be tested under static and dynamic conditions, a comprehensive and intelligent fault detection scheme is provided. Not only directly evaluates the sealing performance of the electrical pressure regulating valve to be tested through the pressure decay test when the engine is shutdown, but also indirectly evaluates the control accuracy and overall efficiency of the electrical pressure regulating valve to be tested by real-time monitoring and analysis of the boost pressure frequency when the engine is running. Through this method, the turbocharging system can timely detect potential problems of the electrical pressure regulating valve to be tested, avoiding problems such as engine performance degradation, increased fuel consumption, and excessive emissions caused by the failure of the electrical pressure regulating valve to be tested, thus ensuring the reliability and operating efficiency of the system. At the same time, this method reduces the dependence on manual maintenance and improves the automation level and accuracy of fault diagnosis.

[0093] In the specific implementation process, the second determination unit includes a control module, a first calculation module, and a first mapping module. The control module is used to, when the engine is in the shutdown state and the pressure of the high-pressure gas cylinder is greater than the preset pressure value, control the solenoid valve of the electrical pressure regulating valve to be tested to close, and after the solenoid valve of the electrical pressure regulating valve to be tested has been closed for a first preset time period, control the electromagnetic isolation valve to close, where the pressure of the high-pressure gas cylinder is measured by an internal pressure sensor installed inside the high-pressure gas cylinder, and the first preset time period is calibrated according to the pipeline volume between the electromagnetic isolation valve and the electrical pressure regulating valve to be tested; the first calculation module is used to monitor the pressure value detected by the pressure sensor within a second preset time period, and calculate the leakage rate within the second preset time period according to the pressure value; the first mapping module is used to map the leakage rate to the first fault diagnosis score according to a first preset mapping rule, where the first preset mapping rule includes the leakage rate and the fault diagnosis score corresponding to the leakage rate, and there is a negative correlation between the leakage rate and the fault diagnosis score corresponding to the leakage rate.

[0094] When the engine is in the shutdown state, by precisely controlling the electromagnetic isolation valve and the solenoid valve of the electrical pressure regulating valve to be tested, and using the data of the pressure sensor, the static sealing performance of the electrical pressure regulating valve to be tested is detected and converted into the first fault diagnosis score. This process provides a scientific and accurate quantification method for the fault assessment of the electrical pressure regulating valve to be tested, which is a key static test step in the fault diagnosis method, and helps to detect whether there is a leakage problem in the electrical pressure regulating valve to be tested under non-operating conditions, thus playing an important role in system maintenance and fault troubleshooting.

[0095] In some embodiments of the present application, the above-mentioned third determination unit includes an acquisition module, a second calculation module, and a second mapping module. The acquisition module is configured to, when the engine is in the above-mentioned operating state, acquire in real time the above-mentioned make-up pressure frequency of the above-mentioned high-pressure gas cylinder within a third preset time period; the second calculation module is configured to use the formula to calculate the above-mentioned make-up pressure frequency deviation ratio within the above-mentioned third preset time period, where is the above-mentioned make-up pressure frequency deviation ratio, is the above-mentioned make-up pressure frequency of the above-mentioned high-pressure gas cylinder within the above-mentioned third preset time period, is the model-predicted make-up pressure frequency; the second mapping module is configured to map the above-mentioned make-up pressure frequency deviation ratio to the above-mentioned second fault diagnosis score according to a second preset mapping rule, where the above-mentioned second preset mapping rule includes the above-mentioned make-up pressure frequency deviation ratio and the corresponding fault diagnosis score of the above-mentioned make-up pressure frequency deviation ratio.

[0096] The above-mentioned second calculation module includes a calculation sub-module, which is configured to use the formula to calculate and obtain the above-mentioned model-predicted make-up pressure frequency, where is the number of brakes, is the braking depth, is the ambient temperature, is the initial pressure of the above-mentioned high-pressure gas cylinder, , , and is a parameter determined based on actual tests and engineering experience. Through the above formula, during the vehicle operation, the reasonable pressure replenishment frequency of the high-pressure gas cylinder can be dynamically predicted according to the real-time operation data, thus laying a solid foundation for the subsequent comparative analysis with the actual pressure replenishment frequency. This embodiment significantly improves the intelligence and accuracy of fault diagnosis. First, it can adapt to the performance changes of the electric pressure regulating valve under different operation scenarios. By adjusting the prediction frequency in real time, it avoids the limitations brought by relying solely on static data or empirical values. Second, by incorporating complex operation parameters into the model, it can automatically identify abnormal behaviors during the process of the electric pressure regulating valve controlling the high-pressure gas replenishment, and can give early warnings even in the stage of minor faults or early performance degradation. Finally, the parameters determined based on actual tests and engineering experience ensure the reliability and applicability of the model prediction, provide a more accurate reference benchmark for the calculation of the subsequent fault diagnosis score, and effectively avoid misdiagnosis and missed diagnosis.

[0097] In summary, during the engine operation state, by monitoring the pressure replenishment frequency of the high-pressure gas cylinder and calculating the pressure replenishment frequency deviation ratio, the dynamic performance of the to-be-tested electric pressure regulating valve is evaluated. By using the comparison between the actual operation data and the expected model, the fault diagnosis of the to-be-tested electric pressure regulating valve is carried out in real time and dynamically, which complements the static test. Through the calculation of the pressure replenishment frequency deviation ratio and the mapping of the fault diagnosis score, the operation state of the to-be-tested electric pressure regulating valve can be monitored in real time, especially applicable to the situation where it is difficult to directly conduct physical inspections during the engine operation. By analyzing the data to indirectly evaluate the performance of the to-be-tested electric pressure regulating valve, potential problems can be detected early, and the safety and reliability of the system can be improved.

[0098] In some other embodiments of the present application, the above fourth determination unit includes a setting module, a third calculation module, and a determination module. The setting module is used to set the weight of the above first fault diagnosis score as the first weight and set the weight of the above second fault diagnosis score as the second weight; the third calculation module is used to use the formula to calculate and obtain the final fault diagnosis score of the to-be-tested electric pressure regulating valve, where is the above final fault diagnosis score, is the above first fault diagnosis score, is the above second fault diagnosis score, is the above first weight, is the above second weight, where the above first weight is greater than the above second weight; the determination module is used to determine whether the to-be-tested electric pressure regulating valve is faulty according to the above final fault diagnosis score.

[0099] The final fault diagnosis score is calculated, and it is judged whether the electrical pressure regulating valve to be tested has a fault according to the preset scoring standard. Usually, a fault threshold is set. If the final fault diagnosis score exceeds the fault threshold, it is considered that there are performance problems or faults in the electrical pressure regulating valve to be tested, and further inspection or maintenance is required. On the contrary, if the final fault diagnosis score does not reach the fault threshold, the electrical pressure regulating valve to be tested is considered to be working normally. This fault determination mechanism based on the final score can quantitatively convert the health status of the electrical pressure regulating valve to be tested into a signal that is easy to understand and operate, providing clear guidance for the maintenance personnel of vehicles or machinery, thereby improving the maintenance efficiency, reducing the fault time, and ensuring the safe operation of the vehicle and the optimal performance of the engine.

[0100] Further, the above device further includes an adjustment unit for adjusting the above first weight and the above second weight in real time according to the ambient temperature, and increasing the above first weight when the ambient temperature rises.

[0101] By dynamically adjusting the weights of the fault diagnosis score according to the ambient temperature, the environmental adaptability and reliability of the electrical pressure regulating valve fault diagnosis method are significantly enhanced. It ensures that in different operating environments, especially under high-temperature conditions, more emphasis can be placed on detecting the sealing performance of the electrical pressure regulating valve to be tested, timely discovering and warning potential faults, and reducing performance degradation or even failure caused by high temperature.

[0102] The above electrical pressure regulating valve fault diagnosis device includes a processor and a memory. The above first determination unit, second determination unit, third determination unit, fourth determination unit, etc. are all stored in the memory as program units, and the processor executes the above program units stored in the memory to implement corresponding functions. The above modules are all located in the same processor; or, the above each module is located in different processors in any combination form.

[0103] The memory may include non-permanent memory in a computer-readable medium, forms such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM), and the memory includes at least one storage chip.

[0104] An embodiment of the present invention provides a computer-readable storage medium, and the above computer-readable storage medium includes a stored program, wherein when the above program runs, it controls the device where the above computer-readable storage medium is located to execute the above electrical pressure regulating valve fault diagnosis method.

[0105] An embodiment of the present invention provides a processor, and the above processor is used to run a program, wherein when the above program runs, it executes the above electrical pressure regulating valve fault diagnosis method.

[0106] An embodiment of the present invention provides an electronic device, including a processor, a memory, and a program stored on the memory and executable on the processor. When the processor executes the program, the steps of the above-mentioned electrical pressure regulating valve fault diagnosis method are implemented. The device herein may be a server, a PC, a PAD, a mobile phone, etc.

[0107] The present application also provides a computer program product, which is adapted to execute a program initialized with the steps of the above-mentioned electrical pressure regulating valve fault diagnosis method when executed on a data processing device.

[0108] Obviously, those skilled in the art should understand that the above-mentioned modules or steps of the present invention can be implemented by a general-purpose computing device. They can be concentrated on a single computing device or distributed on a network composed of multiple computing devices. They can be implemented by program codes executable by the computing device. Thus, they can be stored in a storage device and executed by the computing device. And in some cases, the steps shown or described herein can be executed in a different order, or they can be separately fabricated into individual integrated circuit modules, or multiple modules or steps among them can be fabricated into a single integrated circuit module to implement. In this way, the present invention is not limited to any specific combination of hardware and software.

[0109] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0110] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for realizing the functions specified in Figure 1 one or more flows and / or blocks Figure 1 one or more blocks.

[0111] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction means that implements the functions specified in one or more of the processes and / or blocks Figure 1 in one or more of the processes and / or blocks Figure 1 specified in one or more of the blocks or blocks.

[0112] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus, such that a series of operational steps are performed on the computer or other programmable apparatus to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable apparatus provide steps for implementing the functions specified in one or more of the processes and / or blocks Figure 1 in one or more of the processes and / or blocks Figure 1 specified in one or more of the blocks or blocks.

[0113] In a typical configuration, a computing device includes one or more processors (CPUs), an input / output interface, a network interface, and memory.

[0114] The memory may include non-permanent memory in the form of computer-readable media, random access memory (RAM) and / or non-volatile memory such as read-only memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.

[0115] Computer-readable media includes both permanent and non-permanent, removable and non-removable media implemented by any method or technology for storing information. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile discs (DVD) or other optical storage, magnetic cassettes or other magnetic storage devices, or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory media such as modulated data signals and carrier waves.

[0116] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, commodity or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, commodity or device comprising the element.

[0117] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A turbocharging system, characterized in that, Comprising: A high-pressure gas cylinder, an electromagnetic isolation valve, an electrical pressure regulating valve to be tested, a pressure sensor, and a controller. Wherein, the high-pressure gas cylinder is used to generate a high-pressure gas source. The electromagnetic isolation valve is installed on the pipeline between the outlet of the high-pressure gas cylinder and the electrical pressure regulating valve to be tested. The electromagnetic isolation valve is far from the electrical pressure regulating valve to be tested and close to the high-pressure gas cylinder. The pressure sensor is installed in the pipeline between the electromagnetic isolation valve and the electrical pressure regulating valve to be tested. The controller is electrically connected to the electromagnetic isolation valve and the pressure sensor, and is used to determine whether the electrical pressure regulating valve to be tested is faulty at least according to the state of the engine, the opening and closing state of the electromagnetic isolation valve, and the pressure change value detected by the pressure sensor. The state of the engine is a shutdown state or an operating state.

2. The turbocharging system according to claim 1, wherein The turbocharging system further includes a supercharger, and the supercharger is connected to the working port of the electrical pressure regulating valve to be tested.

3. A fault diagnosis method for an electric pressure regulating valve, characterized in that, The method is applied to the controller in the turbocharging system according to claim 1 or 2, and includes: Determining that the state of the engine is a shutdown state or an operating state. When the engine is in the shutdown state, determining the leakage rate of the electrical pressure regulating valve to be tested based on the opening and closing state of the electromagnetic isolation valve and the pressure change value detected by the pressure sensor, and determining a first fault diagnosis score according to the leakage rate of the electrical pressure regulating valve to be tested. When the engine is in the operating state, determining a boost pressure frequency deviation ratio based on the boost pressure frequency of the high-pressure gas cylinder, and determining a second fault diagnosis score according to the boost pressure frequency deviation ratio. Based on the first fault diagnosis score and the second fault diagnosis score, determining whether the electrical pressure regulating valve to be tested is faulty.

4. The method according to claim 3, wherein When the engine is in the shutdown state, determining the leakage rate of the electrical pressure regulating valve to be tested based on the opening and closing state of the electromagnetic isolation valve and the pressure change value detected by the pressure sensor, and determining a first fault diagnosis score according to the leakage rate of the electrical pressure regulating valve to be tested, including: When the engine is in the shutdown state and the pressure of the high-pressure gas cylinder is greater than a preset pressure value, controlling the electromagnetic valve of the electrical pressure regulating valve to be tested to close, and after the electromagnetic valve of the electrical pressure regulating valve to be tested is closed for a first preset time period, controlling the electromagnetic isolation valve to close. Wherein, the pressure of the high-pressure gas cylinder is measured by an internal pressure sensor installed inside the high-pressure gas cylinder, and the first preset time period is calibrated according to the pipeline volume between the electromagnetic isolation valve and the electrical pressure regulating valve to be tested. Monitoring the pressure value detected by the pressure sensor within a second preset time period, and calculating the leakage rate within the second preset time period according to the pressure value. According to a first preset mapping rule, mapping the leakage rate to the first fault diagnosis score. Wherein, the first preset mapping rule includes the leakage rate and the fault diagnosis score corresponding to the leakage rate, and the leakage rate and the fault diagnosis score corresponding to the leakage rate have a negative correlation.

5. The method according to claim 3, characterized in that, When the engine is in the operating state, determine a boost pressure frequency deviation ratio based on the boost pressure frequency of the high-pressure gas cylinder, and determine a second fault diagnosis score according to the boost pressure frequency deviation ratio, including: When the engine is in the operating state, obtain the boost pressure frequency of the high-pressure gas cylinder in a third preset time period in real time; Use the formula to calculate the make-up pressure frequency deviation ratio within the third preset time period, where is the make-up pressure frequency deviation ratio, is the make-up pressure frequency of the high-pressure gas cylinder within the third preset time period, is the model-predicted make-up pressure frequency; Map the boost pressure frequency deviation ratio to the second fault diagnosis score according to a second preset mapping rule, where the second preset mapping rule includes the boost pressure frequency deviation ratio and the corresponding fault diagnosis score of the boost pressure frequency deviation ratio.

6. The method according to claim 5, characterized in that Use the formula to calculate the boost pressure frequency deviation ratio within the third preset time period, where is the boost pressure frequency deviation ratio, is the boost pressure frequency of the high-pressure gas cylinder within the third preset time period, is the predicted boost pressure frequency by the model, including: Use the formula to calculate the predicted supplementary pressure frequency of the model, where is the number of braking times, is the braking depth, is the ambient temperature, is the initial pressure of the high-pressure gas cylinder, , , and are parameters determined based on actual tests and engineering experience.

7. The method according to claim 3, characterized in that, Based on the first fault diagnosis score and the second fault diagnosis score, determine whether the electrical pressure regulating valve to be tested is faulty, including: Set the weight of the first fault diagnosis score to a first weight, and set the weight of the second fault diagnosis score to a second weight; Use the formula to calculate the final fault diagnosis score of the electrical pressure regulating valve to be tested, where is the final fault diagnosis score, is the first fault diagnosis score, is the second fault diagnosis score, is the first weight, is the second weight, where the first weight is greater than the second weight; Determine whether the electrical pressure regulating valve to be tested is faulty according to the final fault diagnosis score.

8. The method according to claim 7, wherein The method further includes: Adjust the first weight and the second weight in real time according to the ambient temperature, and increase the first weight when the ambient temperature rises.

9. An electrical pressure regulating valve fault diagnosis device, characterized in that, Including: A first determination unit for determining the state of the engine as a shutdown state or an operating state; A second determination unit for determining the leakage rate of the electrical pressure regulating valve to be tested based on the opening and closing state of the electromagnetic isolation valve and the pressure change value detected by the pressure sensor when the engine is in the shutdown state, and determining a first fault diagnosis score according to the leakage rate of the electrical pressure regulating valve to be tested; A third determination unit for determining a boost pressure frequency deviation ratio based on the boost pressure frequency of the high-pressure gas cylinder and determining a second fault diagnosis score according to the boost pressure frequency deviation ratio when the engine is in the operating state; A fourth determination unit for determining whether the electrical pressure regulating valve to be tested is faulty based on the first fault diagnosis score and the second fault diagnosis score.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein when the program runs, it controls the device where the computer-readable storage medium is located to execute the electrical pressure regulating valve fault diagnosis method according to any one of claims 3 to 8.

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