Performance evaluation method of excavator hydraulic pump and computer readable storage medium

Abstract

The invention provides a performance evaluation method of an excavator hydraulic pump and a computer readable storage medium. When the hydraulic pump is in a static working condition, pressure values of the hydraulic pump under multiple first preset working conditions are obtained, multiple hydraulic pump pressure values are obtained, multiple first pressure deviations are obtained based on the multiple hydraulic pump pressure values, the multiple first pressure deviations are compared with a first preset pressure deviation threshold value, and the multiple first pressure deviations are compared with a second preset pressure deviation threshold value. Whether the performance of the hydraulic pump is normal or not is determined according to the obtained first comparison results; under the dynamic working condition of the hydraulic pump, pressure increasing values of the hydraulic pump under multiple second preset working conditions are obtained within the preset time, multiple hydraulic pump pressure increasing values are obtained, multiple second pressure deviations are obtained based on the multiple hydraulic pump pressure increasing values, the multiple second pressure deviations are compared with a second preset pressure deviation threshold value, and the second preset pressure deviation threshold value is obtained; and whether the performance of the hydraulic pump is normal or not is determined according to the obtained second comparison results. The problem that the performance evaluation method of the excavator hydraulic pump is low in efficiency is solved.

Description

Technical Field

[0001] The present application relates to the field of hydraulic technology, and in particular to a performance evaluation method for an excavator hydraulic pump and a computer-readable storage medium. Background Art

[0002] The hydraulic pump is one of the core hydraulic components of the excavator. Due to the harsh working conditions and variable loads of the excavator, the hydraulic pump may experience performance deterioration due to malfunction, damage, or wear of internal components. Therefore, a performance evaluation of the hydraulic pump is required.

[0003] The performance evaluation method of the excavator hydraulic pump in the existing technology cannot automatically evaluate the static and dynamic performance of the hydraulic pump. The measures taken to analyze the relevant performance are too one-sided and highly dependent on the operator's experience, resulting in low evaluation efficiency. Summary of the Invention

[0004] The main purpose of the present application is to provide a performance evaluation method for an excavator hydraulic pump and a computer-readable storage medium, so as to at least solve the problem of low efficiency of the performance evaluation method for an excavator hydraulic pump in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present application, a performance evaluation method for an excavator hydraulic pump is provided, comprising: when the hydraulic pump is in a static operating condition, obtaining pressure values of the hydraulic pump under multiple first preset operating conditions to obtain multiple hydraulic pump pressure values, and obtaining multiple first pressure deviations based on the multiple hydraulic pump pressure values, respectively comparing the multiple first pressure deviations with a first preset pressure deviation threshold value to obtain multiple first comparison results, and determining whether the performance of the hydraulic pump is normal based on the multiple first comparison results, wherein the first preset operating condition is set based on a control current of a shut-off valve and a control current of the hydraulic pump; when the hydraulic pump is in a dynamic operating condition, obtaining pressure increase values of the hydraulic pump under multiple second preset operating conditions within a preset time to obtain multiple hydraulic pump pressure increase values, and obtaining multiple second pressure deviations based on the multiple hydraulic pump pressure increase values, respectively comparing the multiple second pressure deviations with a second preset pressure deviation threshold value to obtain multiple second comparison results, and determining whether the performance of the hydraulic pump is normal based on the multiple second comparison results, wherein the second preset operating condition is set based on the control current of the shut-off valve and a target control current value of the hydraulic pump.

[0006] Optionally, when the hydraulic pump is in a static working condition, the pressure values of the hydraulic pump under multiple first preset working conditions are obtained to obtain multiple hydraulic pump pressure values, including: setting the control current of the shut-off valve to multiple first preset values in sequence; setting the control current of the hydraulic pump to multiple second preset values in sequence under each of the first preset values of the control current of the shut-off valve; combining the first preset values with the second preset values in pairs to obtain multiple first preset working conditions; obtaining the pressure value of the hydraulic pump under each of the first preset working conditions to obtain multiple hydraulic pump pressure values.

[0007] Optionally, multiple first pressure deviations are obtained based on multiple hydraulic pump pressure values, and the multiple first pressure deviations are respectively compared with a first preset pressure deviation threshold to obtain multiple first comparison results, including: subtracting the corresponding first preset standard pressure values from the multiple hydraulic pump pressure values to obtain multiple first pressure deviations, wherein the first preset standard pressure value is obtained based on the statistical results of multiple sample excavators; obtaining the absolute values of the multiple first pressure deviations to obtain multiple first absolute values, and comparing the multiple first absolute values with the first preset pressure deviation threshold in turn to obtain multiple first comparison results, wherein the first preset pressure deviation threshold is determined based on the actual performance deviation of different excavator models and the requirements for corresponding test items during the test process.

[0008] Optionally, whether the performance of the hydraulic pump is normal is determined based on multiple first comparison results, including: if multiple first comparison results are all less than or equal to a first preset standard value, determining that the performance of the hydraulic pump is normal; if there is at least one first comparison result among multiple first comparison results that is greater than the first preset standard value, determining that the performance of the hydraulic pump is abnormal.

[0009] Optionally, when the hydraulic pump is in a dynamic working condition, the pressure increase values of the hydraulic pump under multiple second preset working conditions are obtained within a preset time to obtain multiple hydraulic pump pressure increase values, including: setting the control current of the shut-off valve to multiple third preset values in sequence; setting the control current target value of the hydraulic pump to multiple fourth preset values in sequence under each of the third preset values of the control current of the shut-off valve; combining the third preset values with the fourth preset values in pairs to obtain multiple second preset working conditions; under each of the second preset working conditions, obtaining the pressure increase value of the hydraulic pump within the preset time to obtain multiple hydraulic pump pressure increase values, wherein the preset time is determined based on the actual performance deviation of different excavator models.

[0010] Optionally, multiple second pressure deviations are obtained based on multiple hydraulic pump pressure increase values, and the multiple second pressure deviations are respectively compared with a second preset pressure deviation threshold to obtain multiple second comparison results, including: subtracting the corresponding second preset standard pressure values from the multiple hydraulic pump pressure increase values to obtain multiple second pressure deviations, wherein the second preset standard pressure value is obtained based on the statistical results of multiple sample excavators; obtaining the absolute values of multiple second pressure deviations to obtain multiple second absolute values, and comparing the multiple second absolute values with the second preset pressure deviation threshold in turn to obtain multiple second comparison results, wherein the second preset pressure deviation threshold is determined based on the actual performance deviation of different excavator models and the requirements for corresponding test items during the test process.

[0011] Optionally, whether the performance of the hydraulic pump is normal is determined based on multiple second comparison results, including: if multiple second comparison results are all less than or equal to a second preset standard value, determining that the performance of the hydraulic pump is normal; if there is at least one first comparison result greater than the second preset standard value among the multiple second comparison results, determining that the performance of the hydraulic pump is abnormal.

[0012] Optionally, the static operating condition is the state in which the hydraulic pump operates under a first preset control parameter, and the dynamic operating condition is the state in which the hydraulic pump is in an existing operating state and the control parameters are adjusted to operate under a second preset control parameter, wherein the first preset control parameter includes the control current of the shut-off valve and the control current of the hydraulic pump, and the second preset control parameter includes the control current of the shut-off valve and the control current target value of the hydraulic pump.

[0013] Optionally, if there is at least one first comparison result greater than the first preset standard value among multiple first comparison results, after determining that the performance of the hydraulic pump is abnormal, the method also includes: outputting a current combination corresponding to the first comparison result greater than the first preset standard value, wherein the current combination includes the control current of the shut-off valve and the control current of the hydraulic pump; and performing fault detection on the hydraulic pump based on the current combination.

[0014] According to another aspect of the present application, a computer-readable storage medium is provided, which includes a stored program, wherein when the program is run, the device where the computer-readable storage medium is located is controlled to execute any one of the performance evaluation methods for the excavator hydraulic pump.

[0015] By applying the technical solution of the present application, when the hydraulic pump is in a static working condition, the pressure values of the hydraulic pump under multiple first preset working conditions are obtained to obtain multiple hydraulic pump pressure values, and multiple first pressure deviations are obtained based on the multiple hydraulic pump pressure values. The multiple first pressure deviations are respectively compared with the first preset pressure deviation threshold value to obtain multiple first comparison results, and whether the performance of the hydraulic pump is normal is determined based on the multiple first comparison results, wherein the first preset working condition is set based on the control current of the shut-off valve and the control current of the hydraulic pump; when the hydraulic pump is in a dynamic working condition, the pressure increase values of the hydraulic pump under multiple second preset working conditions are obtained within a preset time to obtain multiple hydraulic pump pressure increase values, and multiple second pressure deviations are obtained based on the multiple hydraulic pump pressure increase values, and the multiple second pressure deviations are respectively compared with the second preset pressure deviation threshold value to obtain multiple second comparison results, and whether the performance of the hydraulic pump is normal is determined based on the multiple second comparison results, wherein the second preset working condition is set based on the control current of the shut-off valve and the control current target value of the hydraulic pump. In this solution, by quantitatively analyzing the pressure deviation of the hydraulic pump under static and dynamic conditions, comparing it with the preset pressure deviation threshold, the performance status of the hydraulic pump is intelligently judged, and a comprehensive evaluation is conducted from static and dynamic perspectives without relying on manual labor, thus solving the problem of low efficiency of the performance evaluation method of the excavator hydraulic pump in the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0017] Figure 1 A hardware structure block diagram of a mobile terminal for executing a performance evaluation method for an excavator hydraulic pump provided in an embodiment of the present application is shown;

[0018] Figure 2 A schematic flow chart of a method for evaluating the performance of an excavator hydraulic pump according to an embodiment of the present application is shown;

[0019] Figure 3 A hydraulic system schematic diagram of a method for evaluating the performance of an excavator hydraulic pump according to an embodiment of the present application is shown;

[0020] Figure 4 A first hydraulic pump static performance evaluation flow chart of a performance evaluation method for an excavator hydraulic pump provided in accordance with an embodiment of the present application is shown;

[0021] Figure 5 A second hydraulic pump static performance evaluation flow chart of a performance evaluation method for an excavator hydraulic pump provided in accordance with an embodiment of the present application is shown;

[0022] Figure 6 A first hydraulic pump dynamic performance evaluation flow chart of a performance evaluation method for an excavator hydraulic pump provided in accordance with an embodiment of the present application is shown;

[0023] Figure 7 A schematic diagram of a first hydraulic pump dynamic test curve of a performance evaluation method for an excavator hydraulic pump provided in accordance with an embodiment of the present application is shown;

[0024] Figure 8 A second hydraulic pump dynamic performance evaluation flow chart of a performance evaluation method for an excavator hydraulic pump provided in accordance with an embodiment of the present application is shown;

[0025] Figure 9 A schematic diagram of a second hydraulic pump dynamic test curve of a performance evaluation method for an excavator hydraulic pump provided in an embodiment of the present application is shown;

[0026] Figure 10 A structural block diagram of a performance evaluation device for an excavator hydraulic pump provided according to an embodiment of the present application is shown.

[0027] The above drawings include the following reference numerals:

[0028] 102. Processor; 104. Memory; 106. Transmission device; 108. Input / output device; 11. First hydraulic oil tank; 12. Second hydraulic oil tank; 20. Engine; 31. First hydraulic pump; 32. Second hydraulic pump; 40. Controller; 51. First pressure sensor; 52. Second pressure sensor; 61. First main valve mid-position channel; 62. Second main valve mid-position channel; 71. First shut-off valve; 72. Second shut-off valve. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] For ease of description, some nouns or terms involved in the embodiments of the present application are explained below:

[0033] Hydraulic pump: A hydraulic component that converts mechanical energy into hydraulic energy. Its input shaft is connected to the engine flywheel, and its oil outlet is connected to the hydraulic main valve. Its main function is to output flow to the main valve, which distributes it to the various hydraulic cylinders and hydraulic motors to control the movement of the entire vehicle. Its output displacement is linearly related to the control current. Since output flow = displacement × speed, when the engine speed is constant, the output flow of the hydraulic pump and its control current are linearly related. In other words, the greater the current, the greater the output flow of the hydraulic pump. In addition, the excavator has a total of two hydraulic pumps, with their input shafts connected in series, that is, the same speed, and the output oil enters the two main oil circuits of the main valve respectively.

[0034] Main Valve Neutral Channel: The excavator main valve involved in this application is an open-center main valve. This means that in the standby mode, when no operation is performed, the valve cores are in the neutral position, allowing the hydraulic pump's output oil to flow directly to the tank. The flow path through which the hydraulic pump flows is the main valve's neutral channel. Because the valve cores are in the neutral position in the standby mode, the opening size of the neutral channel is fixed. Therefore, the left and right neutral channels of the main valve can each be equivalent to a fixed throttle.

[0035] The shut-off valve is essentially an electro-proportional throttle valve, meaning that the greater the current, the smaller the valve opening, and the relationship between the two is linear. The shut-off valve is in series with the hydraulic pump and the main valve's neutral channel, located downstream of the main valve's neutral channel. Normally, when the control current is zero, the valve is fully open. As the control current increases, the valve closes, and the relationship between the two is linear, creating a throttling effect on the oil flowing from the hydraulic pump through the main valve's neutral channel.

[0036] As introduced in the background technology, the performance evaluation method of the excavator hydraulic pump in the prior art cannot automatically evaluate the static and dynamic performance related to the hydraulic pump. The measures taken to analyze the related performance are too one-sided and highly dependent on the operator's experience, resulting in low evaluation efficiency. In order to solve the problem of low efficiency of the performance evaluation method of the excavator hydraulic pump, the embodiments of the present application provide a performance evaluation method and computer-readable storage medium for an excavator hydraulic pump.

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0038] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 FIG. 1 is a hardware structure block diagram of a mobile terminal for a method for evaluating the performance of an excavator hydraulic pump according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1 Only one is shown) a processor 102 (the processor 102 may include but is not limited to a microprocessor MCU or a programmable logic device FPGA and other processing devices) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input and output device 108 for communication functions. It will be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 1 More or fewer components than shown, or with Figure 1 Different configurations shown.

[0039] The memory 104 can be used to store computer programs, such as software programs and modules of application software, such as the computer program corresponding to the device information display method in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, implementing the above-mentioned method. The memory 104 may include a high-speed random access memory and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the above-mentioned networks include but are not limited to the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the above-mentioned network may include a wireless network provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, abbreviated as NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0040] In this embodiment, a performance evaluation method for an excavator hydraulic pump running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0041] Figure 2 This is a flow chart of the performance evaluation method of the excavator hydraulic pump according to the embodiment of the present application. Before explaining the performance evaluation method of the excavator hydraulic pump, the relevant hydraulic system principle part of the present application is introduced first. The relevant hydraulic system principle diagram of the present application is as follows Figure 3 As shown, Figure 3 This is a simplified schematic diagram of the components of the hydraulic system of the excavator to which this application is applied. The components are named as follows: first hydraulic oil tank 11, second hydraulic oil tank 12, engine 20, first hydraulic pump 31, second hydraulic pump 32, controller 40, first pressure sensor 51, second pressure sensor 52, first main valve neutral channel 61, second main valve neutral channel 62, first shut-off valve 71, second shut-off valve 72.

[0042] The connections between the various components are as follows: the system primarily comprises two parts: the circuit associated with the first hydraulic pump 31 and the circuit associated with the second hydraulic pump 32. The hydraulic principles underlying the two parts are identical. First, the system's power source, the engine 20, drives the first and second hydraulic pumps 31, 32 to rotate. A through-shaft transmission connects the first and second hydraulic pumps 31, 32, and both draw oil from the first hydraulic oil tank 11. Then, for the hydraulic circuit outputting the oil from the first hydraulic pump 31, the output oil from the first hydraulic pump 31 passes sequentially through the first main valve neutral channel 61 and the first shut-off valve 71 before entering the second hydraulic oil tank 12. Therefore, in conjunction with the description in the terminology section, the first main valve neutral channel 61 represents a fixed throttle for the first hydraulic pump 31, while the first shut-off valve 71 represents a variable throttle for the first hydraulic pump 31. Similarly, in the hydraulic circuit outputted by the second hydraulic pump 32, the output fluid of the second hydraulic pump 32 sequentially passes through the second main valve center channel 62 and the second shut-off valve 72 before entering the second hydraulic oil tank 12. Therefore, in conjunction with the description in the terminology section, the second main valve center channel 62 serves as a fixed throttle for the second hydraulic pump 32, while the second shut-off valve 72 serves as a variable throttle for the second hydraulic pump 32. Finally, the output portion of the controller 40 controls the displacement of the first and second hydraulic pumps 31 and 32 through current, controlling the opening size of the first and second shut-off valves 71 and 72. Simultaneously, the input portion of the controller 40 collects the pressure at the outlets of the first and second hydraulic pumps 31 and 32 for use in relevant logic decisions.

[0043] Furthermore, the hydraulic orifice throttling formula is Among them, q is the valve port flow, c q is the flow coefficient, A0 is the valve port flow area, Δp is the pressure difference before and after the valve port, and ρ is the liquid density. Since the flow coefficient and liquid density are constants determined by the system's own characteristics, when the valve port flow area A0 is constant, changing the valve port flow q, that is, the output flow of the hydraulic pump, will cause a corresponding change in the pressure difference before and after the valve port. Figure 3 In the flow channel formed by the main valve mid-position channel and the shut-off valve in series, the flow area is the valve port flow area in the hydraulic orifice throttling formula, so the position measured by the pressure sensor is the pressure before the valve port. Since the hydraulic oil tank is behind the valve port, its pressure sum is equivalent to 0, so the pressure tested by the pressure sensor is the pressure difference before and after the valve port. That is to say, when the output flow of the hydraulic pump or the valve port of the shut-off valve changes, the pressure collected by the pressure sensor has a corresponding correspondence.

[0044] Furthermore, for excavators of the same model and configuration, hardware consistency is relatively high across different excavators. Therefore, during implementation, this application will select a sample of excavators with certain data for testing and compile the test results as standard values. The number of samples will be determined during implementation based on actual conditions; generally, the more, the better, but no less than 10.

[0045] like Figure 2 As shown, the performance evaluation method of the excavator hydraulic pump includes the following steps:

[0046] Step S201, when the hydraulic pump is in a static working condition, obtaining pressure values of the hydraulic pump under a plurality of first preset working conditions to obtain a plurality of hydraulic pump pressure values, and obtaining a plurality of first pressure deviations based on the plurality of hydraulic pump pressure values, respectively comparing the plurality of first pressure deviations with a first preset pressure deviation threshold to obtain a plurality of first comparison results, and determining whether the performance of the hydraulic pump is normal based on the plurality of first comparison results, wherein the first preset working condition is set based on a control current of the shut-off valve and a control current of the hydraulic pump;

[0047] Specifically, the first preset operating condition is set based on the shutoff valve control current and the hydraulic pump control current. The shutoff valve control current affects the valve opening, which in turn affects the flow resistance of the hydraulic pump's output oil; the hydraulic pump control current directly affects the pump's displacement. The first preset operating condition involves setting the shutoff valve and hydraulic pump currents. By varying these currents, the hydraulic pump's behavior under different loads and operating conditions can be simulated. Under each of the first preset operating conditions, hydraulic pump pressure values (hydraulic pump pressure values) are obtained, i.e., the pressure at the hydraulic pump outlet. These pressure values are actual measurements at specific shutoff valve and hydraulic pump control currents, reflecting the hydraulic pump's response to the preset operating condition under static conditions. For each hydraulic pump pressure value under the first preset operating condition, the deviation from the standard value (i.e., the pressure value that a normal hydraulic pump should output under the same operating conditions) is calculated to generate multiple first pressure deviations. This standard value is typically statistically derived from the performance of a large number of sample excavators of the same model and configuration under the same operating conditions to ensure that the evaluation criteria are reasonable and representative. Each first pressure deviation is compared with a first preset pressure deviation threshold value, which is set to determine whether the static performance of the hydraulic pump deviates from a normal range. The static performance of the hydraulic pump is comprehensively determined based on the first comparison results under multiple first preset operating conditions.

[0048] Step S201 collects the actual pressure value of the hydraulic pump under preset working conditions and compares it with a predetermined standard pressure value to calculate multiple first pressure deviations. By comparing and analyzing these first pressure deviations with the first preset pressure deviation threshold, it is possible to quickly and accurately identify whether the hydraulic pump deviates from the normal working range under static working conditions, thereby effectively judging the performance status of the hydraulic pump. This method can not only comprehensively evaluate the performance of the hydraulic pump under static conditions, but also greatly improve the efficiency and accuracy of fault detection through automated testing processes and data analysis, reducing dependence on professionals. In addition, by comparing the actual pressure value with the threshold, potential hydraulic pump performance degradation problems, such as internal wear or faulty components, can be discovered in a timely manner, providing a basis for timely maintenance and replacement, and effectively avoiding reduced excavator efficiency and safety risks caused by deterioration of hydraulic pump performance.

[0049] Step S202, when the hydraulic pump is in a dynamic working condition, obtain the pressure increase values of the hydraulic pump under multiple second preset working conditions within a preset time, obtain multiple hydraulic pump pressure increase values, and obtain multiple second pressure deviations based on the multiple hydraulic pump pressure increase values, compare the multiple second pressure deviations with the second preset pressure deviation threshold value respectively, obtain multiple second comparison results, and determine whether the performance of the hydraulic pump is normal based on the multiple second comparison results, wherein the second preset working condition is set based on the control current of the shut-off valve and the control current target value of the hydraulic pump.

[0050] Specifically, the second preset operating condition is set based on the shut-off valve control current and the target hydraulic pump control current. A dynamic operating condition here refers to a sudden change (e.g., a step change) in the hydraulic pump control current to simulate the sudden load changes experienced during actual excavator operation. The shut-off valve control current affects the hydraulic system's resistance, which in turn affects the hydraulic pump's response speed and pressure change. Under the dynamic operating condition, the hydraulic pump pressure increase is recorded over a preset time period. This preset time period is typically short (e.g., a few hundred milliseconds) to observe the hydraulic pump's initial response after a step load. The hydraulic pump pressure increase reflects the hydraulic pump's instantaneous pressure rise capability and is an important indicator of dynamic performance. Based on the hydraulic pump pressure increase values obtained under multiple dynamic operating conditions, the deviation between these values and the expected pressure increase for a standard hydraulic pump under the same operating conditions is calculated to obtain a second pressure deviation. These standard values are typically statistically derived from test data from a large number of hydraulic pumps of the same model and configuration under the same dynamic operating conditions. Each second pressure deviation is compared with a second preset pressure deviation threshold to obtain a second comparison result. Unlike the first pressure deviation threshold under static conditions, the second preset pressure deviation threshold is set for dynamic performance evaluation and is used to determine whether the hydraulic pump's transient pressure response is within a normal range. The second comparison result is used to comprehensively determine whether the hydraulic pump's dynamic performance is normal.

[0051] Step S202 can evaluate the response speed and ability of the hydraulic pump to load changes by testing the pressure increase value of the hydraulic pump under dynamic working conditions, which is crucial for the reliability and safety of the excavator oil pressure system in actual work. Abnormal dynamic performance often indicates that there is wear, seizure or other potential problems inside the hydraulic pump. This method can detect these problems early to avoid further deterioration of the fault. Testing and analysis under dynamic working conditions can be carried out automatically, reducing manpower and time costs and improving the efficiency of troubleshooting. Excavators often encounter sudden changes in load during operation. Ensuring that the hydraulic pump works normally under dynamic working conditions is the key to preventing accidents and ensuring safe operation. In short, by performing performance evaluation under dynamic working conditions of the hydraulic pump, the dynamic response characteristics of the hydraulic pump can be fully understood, potential faults can be discovered in time, and the efficiency and safety of troubleshooting can be improved.

[0052] This embodiment achieves comprehensive automated evaluation of hydraulic pump performance by accurately collecting and analyzing hydraulic pump pressure values and their variations under various preset operating conditions, both static and dynamic, based on the shutoff valve control current and the hydraulic pump control current. This significantly improves the efficiency and accuracy of fault detection. In the static evaluation, by comparing the deviations of multiple hydraulic pump pressure values from a standard value (a first pressure deviation) and comparing them with a first preset pressure deviation threshold, it is possible to quickly determine whether the hydraulic pump's performance under stable operating conditions meets expectations. In the dynamic evaluation, by measuring the instantaneous increase in hydraulic pump pressure within a preset time (the hydraulic pump pressure increase value), the calculated second pressure deviation is compared with the second preset pressure deviation threshold to effectively assess the hydraulic pump's response speed and ability to load changes, ensuring its reliability and safety in the face of sudden changes in actual operation. This not only reduces reliance on manual labor but also reduces the time and cost required for troubleshooting through automated analysis, thereby addressing the low efficiency of existing excavator hydraulic pump performance evaluation methods.

[0053] In the specific implementation process, when the hydraulic pump is in a static working condition, the pressure values of the above-mentioned hydraulic pump under multiple first preset working conditions are obtained to obtain multiple hydraulic pump pressure values, including: setting the control current of the above-mentioned shut-off valve to multiple first preset values in sequence; under each of the above-mentioned first preset values of the control current of the above-mentioned shut-off valve, setting the control current of the above-mentioned hydraulic pump to multiple second preset values in sequence; combining the above-mentioned first preset values with the above-mentioned second preset values in pairs to obtain multiple above-mentioned first preset working conditions; under each of the above-mentioned first preset working conditions, obtaining the pressure value of the above-mentioned hydraulic pump to obtain multiple above-mentioned hydraulic pump pressure values.

[0054] Specifically, there are two hydraulic pumps in the excavator. The static performance evaluation methods of the two pumps are the same, which will be explained separately below. For the static performance evaluation of the first hydraulic pump, the implementation process is as follows Figure 4 shown.

[0055] Start the vehicle, lock the vehicle gear in the highest gear, and cancel the automatic idle;

[0056] The control current of the cut-off valve is sequentially set to a plurality of first preset values. Figure 3 The first hydraulic pump 31 corresponds to the first shut-off valve 71, so the control current of the first shut-off valve is sequentially set to multiple first preset values. In this embodiment, the control current of the first shut-off valve is sequentially set to multiple first preset values 0, iCut1, iCut2, and iCut3. The specific values of iCut1, iCut2, and iCut3 need to be determined in combination with the actual current characteristics of the first shut-off valve. They are usually set to 30%, 60%, and 90% of the controllable range. For example, if the current control range of the first shut-off valve is 400-800 mA, iCut1, iCut2, and iCut3 are set to 520 mA, 640 mA, and 760 mA, respectively.

[0057] Under each first preset value of the control current of the shut-off valve, the control current of the hydraulic pump is sequentially set to a plurality of second preset values. That is, under the above-mentioned four first shut-off valve control currents, the control current of the first hydraulic pump is sequentially set to a plurality of second preset values 0, iPump1, iPump2, iPump3, iPump4, and iPump5, respectively. The specific values of iPump1, iPump2, iPump3, iPump4, and iPump5 need to be determined in combination with the actual current characteristics of the first hydraulic pump, and are usually set to 20%, 40%, 60%, 80%, and 100% of the most controllable range. For example, if the current control range of the first hydraulic pump is 300-800mA, then iPump1, iPump2, iPump3, iPump4, and iPump5 are set to 400mA, 500mA, 600mA, 700mA, and 800mA, respectively.

[0058] The first preset value and the second preset value are combined in pairs to obtain multiple first preset working conditions. For example, when the control current of the first cut-off valve is iCut1, the control current of the first hydraulic pump is set to iPump1, and iCut1 and iPump1 constitute a first preset working condition; for another example, when the control current of the first cut-off valve is iCut3, the control current of the first hydraulic pump is set to iPump5, and iCut3 and iPump5 constitute a first preset working condition. The four first preset values and the six second preset values are combined in pairs to obtain a total of 24 first preset working conditions. The pressure values of the first hydraulic pump under the above 24 first preset working conditions are collected to obtain multiple first hydraulic pump pressure values, which are recorded as pPumpOne1 to pPumpOne24. The corresponding relationship of the result records is shown in Table 1.

[0059] Table 1 Static pressure test record of the first hydraulic pump

[0060]

[0061] By setting the control current of the shut-off valve to multiple first preset values, and setting multiple second preset values for the control current of the hydraulic pump at each first preset value, a variety of first preset operating conditions are formed by combining them in pairs, ensuring that the evaluation covers the static response characteristics of the hydraulic pump under different impedance conditions and output instructions. The hydraulic pump pressure values obtained under various operating conditions provide a rich data foundation for subsequent comparative analysis with standard values, thereby accurately determining whether the static performance of the hydraulic pump is normal. This method not only enables early identification of internal wear and failure of the hydraulic pump, reducing the risk of equipment downtime due to degraded hydraulic pump performance, but also greatly improves evaluation efficiency through automated settings and data collection, reduces dependence on professional technicians, and reduces operating costs.

[0062] In some embodiments of the present application, multiple first pressure deviations are obtained based on multiple hydraulic pump pressure values, and the multiple first pressure deviations are respectively compared with the first preset pressure deviation threshold to obtain multiple first comparison results, including: subtracting the corresponding first preset standard pressure values from the multiple hydraulic pump pressure values to obtain multiple first pressure deviations, wherein the first preset standard pressure value is obtained based on the statistical results of multiple sample excavators; obtaining the absolute values of the multiple first pressure deviations to obtain multiple first absolute values, and comparing the multiple first absolute values with the first preset pressure deviation threshold in turn to obtain multiple first comparison results, wherein the first preset pressure deviation threshold is determined based on the actual performance deviation of different excavator models and the requirements for corresponding test items during the test process.

[0063] Specifically, referring to Table 1, the standard values (first preset standard pressure values) pPumpStand1 to pPumpStand24 are subtracted from the 24 sets of results (multiple first hydraulic pump pressure values) in Table 1 to obtain multiple first pressure deviations pPumpOneDelta1 to pPumpOneDelta24, where the first preset standard pressure values pPumpStand1 to pPumpStand24 are the statistical results of the above-mentioned 10 sample models.

[0064] The absolute values of the first pressure deviations pPumpOneDelta1 to pPumpOneDelta24 are respectively compared with the normal standard (first preset pressure deviation threshold) pPumpStand0. The first preset pressure deviation threshold pPumpStand0 needs to be determined based on the actual performance deviation of different models and the strictness of the test process requirements for the corresponding test items. The specific value can be 5 bar, 10 bar, etc.

[0065] By comparing the deviation between the measured pressure values of the hydraulic pump under different operating conditions and a first preset standard pressure value based on sample statistics (first pressure deviation), accurate quantification of the hydraulic pump's performance stability is achieved. Furthermore, by setting a first preset pressure deviation threshold, which is based on a deep understanding of different machine models and strict requirements for test accuracy, and performing a standardized comparison of the absolute value of the first pressure deviation, it is possible to effectively distinguish between normal operating conditions and potential fault conditions, achieving efficient and accurate judgment of the hydraulic pump's static performance. This not only enables early detection of subtle changes in hydraulic pump performance, reducing equipment failures and downtime caused by performance degradation, but also, through automated comparison and threshold setting, reduces the evaluation process's reliance on professional experience, improves the objectivity and efficiency of the test, and provides strong technical support for routine maintenance and fault prevention of excavator hydraulic systems, ensuring the long-term stability and cost-effectiveness of the equipment.

[0066] Furthermore, whether the performance of the above-mentioned hydraulic pump is normal is determined based on the multiple first comparison results, including: if the multiple first comparison results are all less than or equal to the first preset standard value, determining that the performance of the above-mentioned hydraulic pump is normal; if there is at least one first comparison result greater than the above-mentioned first preset standard value among the multiple first comparison results, determining that the performance of the above-mentioned hydraulic pump is abnormal.

[0067] Specifically, if the absolute values of the first pressure deviations pPumpOneDelta1 to pPumpOneDelta24 are all less than or equal to the first preset standard value pPumpStand0, the static performance of the first hydraulic pump is considered to be normal; if at least one of the absolute values of the first pressure deviations pPumpOneDelta1 to pPumpOneDelta24 is greater than the first preset standard value pPumpStand0, the static performance of the first hydraulic pump is considered to be abnormal, and the current combination of the first shut-off valve and the first hydraulic pump corresponding to the abnormal result is output.

[0068] By summarizing and analyzing multiple first comparison results, the hydraulic pump's performance status can be accurately determined. If all first comparison results fall within the first preset standard value, the hydraulic pump's performance is stable and normal under the static operating conditions tested. Conversely, if any first comparison result under any operating condition exceeds the first preset standard value, the hydraulic pump may be experiencing wear, failure, or other performance degradation. This clear threshold judgment enhances the objectivity and reliability of performance evaluation, ensuring accurate and timely fault detection.

[0069] Similarly, the principle is the same as the first hydraulic pump. For the static performance evaluation of the second hydraulic pump, the implementation process is as follows: Figure 5 The specific process is as follows:

[0070] Start the vehicle, lock the vehicle gear in the highest gear, and cancel the automatic idle;

[0071] The control current of the second cut-off valve is sequentially set to a plurality of first preset values 0, iCut1, iCut2, and iCut3, wherein the specific values of iCut1, iCut2, and iCut3 need to be determined in combination with the actual current characteristics of the second cut-off valve. They are usually set to 30%, 60%, and 90% of the controllable range. For example, if the current control range of the second cut-off valve is 400-800 mA, iCut1, iCut2, and iCut3 are set to 520 mA, 640 mA, and 760 mA, respectively.

[0072] Under the above four control currents of the second shut-off valve, the control current of the second hydraulic pump is set to multiple second preset values 0, iPump1, iPump2, iPump3, iPump4, and iPump5 respectively, wherein the specific values of iPump1, iPump2, iPump3, iPump4, and iPump5 need to be determined in combination with the actual current characteristics of the second hydraulic pump, and usually need to be set to 20%, 40%, 60%, 80%, and 100% of the most controllable range. For example, if the current control range of the second hydraulic pump is 300-800mA, iPump1, iPump2, iPump3, iPump4, and iPump5 are set to 400mA, 500mA, 600mA, 700mA, and 800mA respectively;

[0073] The first preset value and the second preset value are combined in pairs to obtain multiple first preset working conditions. For example, when the control current of the first cut-off valve is iCut2, the control current of the first hydraulic pump is set to iPump3, and iCut2 and iPump3 form a first preset working condition; for another example, when the control current of the first cut-off valve is iCut1, the control current of the first hydraulic pump is set to iPump4, and iCut1 and iPump4 form a first preset working condition. The four first preset values and the six second preset values are combined in pairs to obtain a total of 24 first preset working conditions. The pressure values of the second hydraulic pump under the above 24 first preset working conditions are collected to obtain multiple second hydraulic pump pressure values, which are recorded as pPumpTwo1 to pPumpTwo24. The corresponding relationship of the result records is shown in Table 2.

[0074] Table 2 Second hydraulic pump static pressure test record

[0075]

[0076] Subtract the standard values (first preset standard pressure values) pPumpStand1 to pPumpStand24 from the 24 groups of results (multiple second hydraulic pump pressure values) in Table 2 and compare them to obtain multiple second pressure deviations pPumpTwoDelta1 to pPumpTwoDelta24, where the first preset standard pressure values pPumpStand1 to pPumpStand24 are the statistical results of the above 10 sample models.

[0077] The absolute values of the second pressure deviations pPumpTwoDelta1 to pPumpTwoDelta24 are respectively compared with the normal standard (first preset pressure deviation threshold) pPumpStand0. Among them, the (first preset pressure deviation threshold) pPumpStand0 needs to be determined in combination with the actual performance deviation of different models and the strictness of the test process for the corresponding test items. The specific values can be 5bar, 10bar, etc. If the absolute values of the second pressure deviations pPumpTwoDelta1 to pPumpTwoDelta24 are all less than or equal to the first preset standard value pPumpStand0, it is considered that the static performance of the second hydraulic pump is normal. If at least one of the absolute values of the second pressure deviations pPumpTwoDelta1 to pPumpTwoDelta24 is greater than the first preset standard value pPumpStand0, it is considered that the static performance of the second hydraulic pump is abnormal, and the current combination of the second shut-off valve and the second hydraulic pump corresponding to the abnormal result is input.

[0078] In summary, the static performance evaluation of the first hydraulic pump and the second hydraulic pump is completed.

[0079] In some embodiments of the present application, when the hydraulic pump is in a dynamic working condition, the pressure increase values of the hydraulic pump under multiple second preset working conditions are obtained within a preset time to obtain multiple hydraulic pump pressure increase values, including: setting the control current of the shut-off valve to multiple third preset values in sequence; setting the control current target value of the hydraulic pump to multiple fourth preset values in sequence under each of the third preset values of the control current of the shut-off valve; combining the third preset values with the fourth preset values in pairs to obtain multiple second preset working conditions; under each of the second preset working conditions, obtaining the pressure increase value of the hydraulic pump within the preset time to obtain multiple hydraulic pump pressure increase values, wherein the preset time is determined based on the actual performance deviation of different excavator models.

[0080] Specifically, the dynamic performance evaluation methods of the two pumps are the same, which will be explained separately below. For the dynamic performance evaluation of the first hydraulic pump, the implementation process is as follows Figure 6 The specific process is as follows:

[0081] Start the vehicle, lock the vehicle gear in the highest gear, and cancel the automatic idle;

[0082] The control current of the cut-off valve is sequentially set to a plurality of third preset values. Specifically, the control current of the first cut-off valve is sequentially set to a plurality of third preset values iCutStep1, iCutStep2, and iCutStep3, wherein the specific values of iCutStep1, iCutStep2, and iCutStep3 need to be determined in combination with the actual current characteristics of the first cut-off valve, and are generally set to 25%, 50%, and 75% of the controllable range. For example, if the current control range of the first cut-off valve is 400-800mA, iCutStep1, iCutStep2, and iCutStep3 are set to 500mA, 600mA, and 700mA, respectively.

[0083] At each third preset value of the control current of the shut-off valve, the control current target value of the hydraulic pump is sequentially set to a plurality of fourth preset values. Specifically, under the above-mentioned three control currents of the first shut-off valve, the control current target value of the first hydraulic pump is sequentially given a plurality of step signals of the fourth preset values iPumpStep1, iPumpStep2, and iPumpStep3. The specific values of iPumpStep1, iPumpStep2, and iPumpStep3 need to be determined in combination with the actual current characteristics of the first hydraulic pump, and are usually set to 35%, 70%, and 100% of the most controllable range. For example, if the current control range of the first hydraulic pump is 300-800mA, iPumpStep1, iPumpStep2, and iPumpStep3 are set to 475mA, 650mA, and 800mA, respectively.

[0084] The third preset value and the fourth preset value are combined in pairs to obtain multiple second preset working conditions. For example, when the control current of the first cut-off valve is iCutStep1, the control current target value of the first hydraulic pump is set to iPumpStep2, and iCutStep1 and iPumpStep2 constitute a second preset working condition. The three third preset values and the three fourth preset values are combined in pairs to obtain a total of 9 second preset working conditions. Under the above 9 second preset working conditions, the pressure increase value of the first hydraulic pump within the preset time dt from the starting point of the control current step of the first hydraulic pump is collected to obtain multiple first hydraulic pump pressure increase values, which are recorded as pPumpOneStep1 to pPumpOneStep9, wherein the preset time dt needs to be determined in combination with the actual performance deviation of different models, and the specific value can be 300ms, 500ms, etc. The corresponding current and pressure relationship is shown as follows Figure 7 As shown, the first hydraulic pump pressure increase value pPumpOneStep1 is less than the first hydraulic pump pressure standard increase value pPumpStandStep1.

[0085] The corresponding relationship is shown in Table 3 according to the result records.

[0086] Table 3 First hydraulic pump dynamic pressure test record

[0087]

[0088] By setting multiple current combinations for the shut-off valve and hydraulic pump under dynamic loading, a variety of second preset operating conditions are formed. This can capture the pressure change characteristics of the hydraulic pump's step response and intuitively reflect the dynamic performance status of the hydraulic pump. The pressure increase values collected within the preset time are calibrated against the actual performance deviations of different models to ensure the rationality of the test time, thereby improving the accuracy and reliability of the evaluation results. Not only can abnormal performance of the hydraulic pump under dynamic conditions be promptly identified, but the response speed and load adaptability of the hydraulic pump can also be evaluated. This provides an important basis for on-site fault diagnosis and preventive maintenance of excavators, effectively ensuring the safety and efficiency of equipment operation.

[0089] In some embodiments of the present application, multiple second pressure deviations are obtained based on multiple hydraulic pump pressure increase values, and the multiple second pressure deviations are respectively compared with the second preset pressure deviation threshold to obtain multiple second comparison results, including: subtracting the corresponding second preset standard pressure values from the multiple hydraulic pump pressure increase values to obtain multiple second pressure deviations, wherein the second preset standard pressure value is obtained based on the statistical results of multiple sample excavators; obtaining the absolute values of the multiple second pressure deviations to obtain multiple second absolute values, and comparing the multiple second absolute values with the second preset pressure deviation threshold in turn to obtain multiple second comparison results, wherein the second preset pressure deviation threshold is determined based on the actual performance deviation of different excavator models and the requirements for corresponding test items during the test process.

[0090] Specifically, the 9 groups of results (multiple hydraulic pump pressure increase values) in Table 3 are respectively subtracted from the standard values (second preset standard pressure values) pPumpStandStep1 to pPumpStandStep9 to obtain multiple second pressure deviations pPumpOneStepDelta1 to pPumpOneStepDelta9, where the second preset standard pressure values pPumpStandStep1 to pPumpStandStep9 are the statistical results of the above 10 sample models.

[0091] The absolute values of the second pressure deviations pPumpOneStepDelta1 to pPumpOneStepDelta9 are respectively compared with the normal standard (second preset pressure deviation threshold) pPumpStandStep0. The second preset pressure deviation threshold pPumpStandStep0 needs to be determined based on the actual performance deviation of different models and the strictness of the test process requirements for the corresponding test items. The specific value can be 500 bar, 1000 bar, etc. The absolute values of the second pressure deviations pPumpOneStepDelta1 to pPumpOneStepDelta9 are compared with the second preset pressure deviation threshold in sequence to obtain multiple second comparison results.

[0092] By comparing the hydraulic pump's pressure increase under dynamic conditions with a statistically determined second preset standard pressure value, the dynamic performance deviation of the hydraulic pump is precisely quantified. A standard pressure value (the second preset pressure deviation threshold) established based on statistical results from a sample excavator ensures that the performance evaluation benchmark closely matches actual operating conditions. By calculating the deviation between the actual pressure increase and the preset standard value, eliminating directional influences using absolute values, and comparing this value with the second preset pressure deviation threshold, the performance of the hydraulic pump under dynamic loading can be objectively determined.

[0093] Furthermore, whether the performance of the above-mentioned hydraulic pump is normal is determined based on the multiple second comparison results, including: if the multiple second comparison results are all less than or equal to the second preset standard value, determining that the performance of the above-mentioned hydraulic pump is normal; if there is at least one first comparison result greater than the above-mentioned second preset standard value among the multiple second comparison results, determining that the performance of the above-mentioned hydraulic pump is abnormal.

[0094] Specifically, if the absolute values of the second pressure deviations pPumpOneStepDelta1 to pPumpOneStepDelta9 are all less than or equal to the second preset pressure deviation threshold pPumpStandStep0, the dynamic performance of the first hydraulic pump is considered to be normal; if there is at least one value greater than pPumpStandStep0 among the absolute values of the second pressure deviations pPumpOneStepDelta1 to pPumpOneStepDelta9, the dynamic performance of the first hydraulic pump is considered to be abnormal, and the current combination of the first shut-off valve and the first hydraulic pump corresponding to the abnormal result is input.

[0095] By systematically analyzing the hydraulic pump's pressure changes during dynamic loading, we can accurately determine the health of its dynamic performance. When the deviations of all dynamic test results are within a reasonable second preset standard value, it proves that the hydraulic pump exhibits stable and normal response characteristics when subjected to transient load changes, ensuring the reliability of the excavator's dynamic performance during operation. Conversely, if the pressure change under any test condition exceeds the preset standard, it immediately reveals possible anomalies or potential failures in the hydraulic pump, avoiding equipment safety hazards and operation interruptions caused by dynamic performance failure. This greatly improves the accuracy of dynamic performance monitoring, strengthens the fault warning mechanism, reduces maintenance costs and downtime caused by dynamic performance anomalies, and provides a solid guarantee for the efficient and safe operation of the excavator.

[0096] For the dynamic performance evaluation of the second hydraulic pump, the implementation process is as follows Figure 8 The specific process is as follows:

[0097] Start the vehicle, lock the vehicle gear in the highest gear, and cancel the automatic idle;

[0098] The control current of the second cut-off valve is sequentially set to a plurality of third preset values iCutStep1, iCutStep2, and iCutStep3, wherein the specific values of iCutStep1, iCutStep2, and iCutStep3 need to be determined in combination with the actual current characteristics of the second cut-off valve, and are usually set to 25%, 50%, and 75% of the controllable range. For example, if the current control range of the second cut-off valve is 400-800 mA, iCutStep1, iCutStep2, and iCutStep3 are set to 500 mA, 600 mA, and 700 mA respectively;

[0099] Under the above three control currents of the second shut-off valve, the control current target values of the second hydraulic pump are step signals of multiple fourth preset values iPumpStep1, iPumpStep2, and iPumpStep3, respectively. The specific values of iPumpStep1, iPumpStep2, and iPumpStep3 need to be determined in combination with the actual current characteristics of the second hydraulic pump. They are usually set to 35%, 70%, and 100% of the most controllable range. For example, if the current control range of the second hydraulic pump is 300-800mA, iPumpStep1, iPumpStep2, and iPumpStep3 are set to 475mA, 650mA, and 800mA respectively.

[0100] The third preset value and the fourth preset value are combined in pairs to obtain multiple second preset working conditions. For example, when the control current of the first cut-off valve is iCutStep2, the control current target value of the second hydraulic pump is set to iPumpStep3, and iCutStep2 and iPumpStep3 constitute a second preset working condition. The three third preset values and the three fourth preset values are combined in pairs to obtain a total of 9 second preset working conditions. Under the above 9 second preset working conditions, the pressure increase value of the second hydraulic pump within the preset time dt from the starting point of the control current step of the second hydraulic pump is collected to obtain multiple second hydraulic pump pressure increase values, which are recorded as pPumpTwoStep1 to pPumpTwoStep9, wherein the preset time dt needs to be determined in combination with the actual performance deviation of different models, and the specific value can be 300ms, 500ms, etc. The corresponding current and pressure relationship is shown as follows Figure 9 As shown, the second hydraulic pump pressure increase value pPumpTwoStep1 is smaller than the second hydraulic pump pressure standard increase value pPumpStandStep1.

[0101] The corresponding relationship is shown in Table 4 according to the result records.

[0102] Table 4 Second hydraulic pump dynamic pressure test record

[0103]

[0104] Subtract the standard values (second preset standard pressure values) pPumpStandStep1 to pPumpStandStep9 from the 9 groups of results (multiple hydraulic pump pressure increase values) in Table 4 to obtain multiple second pressure deviations pPumpTwoStepDelta1 to pPumpTwoStepDelta9, where the standard values (second preset standard pressure values) pPumpStandStep1 to pPumpStandStep9 are the statistical results of the above 10 sample models.

[0105] The absolute values of the second pressure deviations pPumpTwoStepDelta1 to pPumpTwoStepDelta9 are respectively compared with the normal standard (second preset pressure deviation threshold) pPumpStandStep0. The second preset pressure deviation threshold pPumpStandStep0 needs to be determined based on the actual performance deviation of different models and the strictness of the test process requirements for the corresponding test items. The specific value can be 500 bar, 1000 bar, etc. The absolute values of the second pressure deviations pPumpTwoStepDelta1 to pPumpTwoStepDelta9 are compared with the second preset pressure deviation threshold in sequence to obtain multiple second comparison results. If the absolute values of the second pressure deviations pPumpTwoStepDelta1 to pPumpTwoStepDelta9 are all less than or equal to the second preset pressure deviation threshold pPumpStandStep0, the dynamic performance of the second hydraulic pump is considered to be normal; if there is at least one value greater than pPumpStandStep0 among the absolute values of the second pressure deviations pPumpTwoStepDelta1 to pPumpTwoStepDelta9, the dynamic performance of the second hydraulic pump is considered to be abnormal, and the current combination of the first shut-off valve and the first hydraulic pump corresponding to the abnormal result is input.

[0106] In summary, the dynamic performance evaluation of the first hydraulic pump and the second hydraulic pump is completed.

[0107] In order to adapt to different models of excavators and hydraulic pumps, the present application provides an adaptive test parameter adjustment mechanism. It can automatically adjust the test parameters used for performance evaluation under static and dynamic conditions, such as the preset value of the control current, the length of the test time, and the threshold of the pressure deviation, according to the characteristics of the specific model of excavator and hydraulic pump. By combining the technical parameters of the equipment with historical maintenance data, this mechanism ensures the accuracy and reliability of the test results, and can perform effective performance evaluation even when facing new models or unknown working conditions. Specifically, by reading the equipment model, the corresponding test parameters are automatically matched to ensure that the evaluation process is adapted to the specific model; based on real-time test data, the parameters of subsequent tests are dynamically adjusted, such as increasing or decreasing the step amplitude of the control current, or adjusting the test time point, to more accurately detect the performance changes of the hydraulic pump; by comparing the current test data with historical data or reference data sets, the test results can be automatically calibrated to avoid misjudgments or omissions caused by improper test parameter settings.

[0108] In other embodiments of the present application, the static working condition is the state in which the hydraulic pump operates under the first preset control parameters, and the dynamic working condition is the state in which the hydraulic pump is in the existing operating state and the control parameters are adjusted to the state in which the hydraulic pump operates under the second preset control parameters, wherein the first preset control parameters include the control current of the shut-off valve and the control current of the hydraulic pump, and the second preset control parameters include the control current of the shut-off valve and the control current target value of the hydraulic pump.

[0109] Specifically, static operation refers to the state of a hydraulic pump operating under a fixed set of control parameters (first preset control parameters). It primarily detects the performance stability of the hydraulic pump under sustained, stable operating conditions. In this embodiment, the parameter settings for the static operating condition include the control current of the shut-off valve and the control current of the hydraulic pump. By accurately setting these two control parameters, the output pressure of the hydraulic pump under specific static conditions can be evaluated, as well as the deviation between this pressure and the standard or expected value, to determine whether the hydraulic pump is in good static operating condition.

[0110] Unlike static working conditions, dynamic working conditions focus on evaluating the response capability and performance of the hydraulic pump under transient changing conditions. Under this working condition, the hydraulic pump is initially in an existing operating state (i.e., it has been working under a certain static working condition), and then the control parameters are suddenly adjusted to new preset values, i.e., the second preset control parameters. The second preset control parameters also include the control current of the shut-off valve and the target control current value of the hydraulic pump. By monitoring the pressure changes of the hydraulic pump in a short period of time (such as within a preset time) after the control parameters are adjusted, i.e., the increase in pressure, the dynamic performance of the hydraulic pump can be evaluated, including its response speed and pressure recovery capability under step response. If the pressure change deviates significantly from the expected value, this may indicate that the hydraulic pump has performance degradation or failure under dynamic loading conditions.

[0111] Static operating condition assessments ensure that the hydraulic pump meets performance standards at stable operating points, while dynamic operating condition assessments verify the pump's performance stability under unexpected operating conditions. This comprehensive assessment approach helps identify potential hydraulic pump issues early, improving excavator maintenance efficiency and operational safety. It also reduces unplanned downtime and maintenance costs caused by hydraulic pump performance deficiencies, ultimately enhancing overall excavator operation reliability and economic efficiency.

[0112] In some further embodiments of the present application, if there is at least one first comparison result greater than the first preset standard value among the multiple first comparison results, after determining that the performance of the hydraulic pump is abnormal, the method further includes: outputting a current combination corresponding to the first comparison result greater than the first preset standard value, wherein the current combination includes the control current of the shut-off valve and the control current of the hydraulic pump; and performing fault detection on the hydraulic pump based on the current combination.

[0113] Specifically, when at least one of the first comparison results is greater than the first preset standard value, it indicates that the hydraulic pump may have performance abnormalities or potential failures under certain specific working conditions. In this case, the subsequent processing steps become crucial to ensure that the problem can be quickly and accurately located and appropriate maintenance measures can be taken. Record the specific working conditions that cause the first comparison result to exceed the standard value, that is, the corresponding combination of the control current of the shut-off valve and the control current of the hydraulic pump. This information is extremely critical for fault detection because it is directly related to under which specific loading conditions the hydraulic pump fails to achieve the expected performance. The output current combination includes not only the control current of the shut-off valve, but also the control current of the hydraulic pump, which together constitute the key parameters under abnormal working conditions.

[0114] Based on the above current combinations, further in-depth fault detection of the hydraulic pump can be performed. This means that by analyzing under which specific current combinations the hydraulic pump's performance is abnormal, the relevant components or system configuration of the hydraulic pump can be specifically inspected to determine the specific problem. The fault detection process may include inspections of the wear of the hydraulic pump's internal parts, the responsiveness of the shut-off valve, and the accuracy of the electronic control system's signal transmission. Compared to relying solely on the operator's experience and judgment, this fault detection method based on abnormal current combinations can locate the cause of the fault more quickly and accurately, thereby improving maintenance efficiency and reducing unnecessary equipment downtime.

[0115] The processing method after detecting abnormal performance of the hydraulic pump under dynamic working conditions is consistent with the processing method after detecting abnormal performance of the hydraulic pump under the above-mentioned static working conditions, and will not be repeated here.

[0116] Based on the dynamic performance evaluation, this embodiment introduces an intelligent fault prediction and early warning solution. This solution uses a machine learning algorithm to train a set of models that can predict possible future failures of hydraulic pumps based on historical dynamic performance test data. By real-time monitoring of the pressure change trend of the hydraulic pump under dynamic working conditions, potential performance deterioration or failure risks can be predicted in advance, and early warnings can be issued to operators or maintenance teams in a timely manner to guide preventive maintenance measures. It can significantly reduce unplanned downtime caused by sudden equipment failures and improve the operating efficiency and safety of excavators. Specifically, a large amount of dynamic working condition test data is used to train the prediction model, so that early signs of dynamic performance anomalies can be identified; dynamic pressure data is analyzed in real time, and once the prediction model identifies a potential failure risk, the early warning mechanism is immediately triggered to notify relevant personnel; based on the prediction results, preventive maintenance recommendations can be generated, including specific inspection items, possible faulty components and maintenance time points, to help operators or maintenance teams effectively plan maintenance work.

[0117] This application proposes a detailed static and dynamic performance test scheme for excavator hydraulic pumps. The relevant technical scheme utilizes software modification based on the hydraulic system hardware. During the implementation process, this application automatically completes the performance evaluation of 9-24 working points and outputs the corresponding results, without the need for operator intervention. The key points are: a hydraulic principle for online evaluation of the static and dynamic performance of excavator hydraulic pumps is proposed; an online testing method for the static performance of excavator hydraulic pumps is proposed, which tests the performance of 24 working points and automatically outputs the corresponding results. The basic values and evaluation criteria involved in the test process can be modified according to different models and different test evaluation rigor; an online testing method for the dynamic performance of excavator hydraulic pumps is proposed, which tests the performance of 9 working points and automatically outputs the corresponding results. The basic values and evaluation criteria involved in the test process can be modified according to different models and different test evaluation rigor.

[0118] The embodiment of the present application also provides a performance evaluation device for an excavator hydraulic pump. It should be noted that the performance evaluation device for an excavator hydraulic pump in the embodiment of the present application can be used to execute the performance evaluation device for an excavator hydraulic pump provided in the embodiment of the present application. The device is used to implement the above-mentioned embodiments and preferred implementations, and the details that have been explained will not be repeated here. As used below, the term "module" can be a combination of software and / or hardware that implements 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 conceivable.

[0119] The following introduces the performance evaluation device of the excavator hydraulic pump provided in the embodiment of the present application.

[0120] Figure 10FIG. 1 is a structural block diagram of a performance evaluation device for an excavator hydraulic pump according to an embodiment of the present application. Figure 10 As shown, the apparatus includes a first determination unit 100 and a second determination unit 200. The first determination unit is configured to, when the hydraulic pump is in a static working condition, obtain pressure values of the hydraulic pump under multiple first preset working conditions to obtain multiple hydraulic pump pressure values, obtain multiple first pressure deviations based on the multiple hydraulic pump pressure values, compare the multiple first pressure deviations with a first preset pressure deviation threshold value to obtain multiple first comparison results, and determine whether the performance of the hydraulic pump is normal based on the multiple first comparison results, wherein the first preset working condition is set based on the control current of the shut-off valve and the control current of the hydraulic pump. The second determination unit is configured to, when the hydraulic pump is in a dynamic working condition, obtain pressure increase values of the hydraulic pump under multiple second preset working conditions within a preset time to obtain multiple hydraulic pump pressure increase values, obtain multiple second pressure deviations based on the multiple hydraulic pump pressure increase values, compare the multiple second pressure deviations with a second preset pressure deviation threshold value to obtain multiple second comparison results, and determine whether the performance of the hydraulic pump is normal based on the multiple second comparison results, wherein the second preset working condition is set based on the control current of the shut-off valve and the target control current value of the hydraulic pump.

[0121] By accurately collecting and analyzing hydraulic pump pressure values and their variations under various preset operating conditions, both static and dynamic, based on the shutoff valve control current and the hydraulic pump control current, this system achieves comprehensive automated evaluation of hydraulic pump performance, significantly improving the efficiency and accuracy of fault detection. This not only reduces reliance on manual labor but also reduces the time and cost of troubleshooting through automated analysis, thus addressing the inefficiency of existing performance evaluation methods for excavator hydraulic pumps.

[0122] In a specific implementation process, the first determination unit includes a first setting module, a second setting module, a first combining module, and a first acquiring module. The first setting module is used to sequentially set the control current of the shut-off valve to a plurality of first preset values; the second setting module is used to sequentially set the control current of the hydraulic pump to a plurality of second preset values under each of the first preset values of the control current of the shut-off valve; the first combining module is used to combine the first preset values with the second preset values in pairs to obtain a plurality of the first preset operating conditions; and the first acquiring module is used to obtain the pressure value of the hydraulic pump under each of the first preset operating conditions to obtain a plurality of the hydraulic pump pressure values.

[0123] The above process not only enables early identification of internal wear and failures in hydraulic pumps, reducing the risk of equipment downtime due to degraded hydraulic pump performance, but also greatly improves assessment efficiency through automated settings and data collection, reduces reliance on professional technicians, and reduces operating costs.

[0124] In some embodiments of the present application, the first determination unit includes a first calculation module and a first comparison module. The first calculation module is used to subtract the corresponding first preset standard pressure value from each of the plurality of hydraulic pump pressure values to obtain the plurality of first pressure deviations, wherein the first preset standard pressure value is obtained based on statistical results of a plurality of sample excavators; and the first comparison module is used to obtain the absolute values of the plurality of first pressure deviations to obtain a plurality of first absolute values, and to compare the plurality of first absolute values with the first preset pressure deviation threshold value in turn to obtain the plurality of first comparison results, wherein the first preset pressure deviation threshold value is determined based on actual performance deviations of different excavator models and requirements for corresponding test items during the test process.

[0125] The above process not only enables early detection of subtle changes in hydraulic pump performance, reducing equipment failures and downtime due to performance degradation, but also, through automated comparison and threshold setting, reduces the evaluation process's reliance on professional experience, improves the objectivity and efficiency of the test, and provides strong technical support for the daily maintenance and fault prevention of excavator hydraulic systems, ensuring the long-term stability and economy of the equipment.

[0126] Furthermore, the first determination unit includes a first determination module and a second determination module. The first determination module is configured to determine that the performance of the hydraulic pump is normal if a plurality of the first comparison results are all less than or equal to a first preset standard value; and the second determination module is configured to determine that the performance of the hydraulic pump is abnormal if at least one of the plurality of first comparison results is greater than the first preset standard value.

[0127] By summarizing and analyzing multiple first comparison results, the hydraulic pump's performance status can be accurately determined. If all first comparison results fall within the first preset standard value, the hydraulic pump's performance is stable and normal under the static operating conditions tested. Conversely, if any first comparison result under any operating condition exceeds the first preset standard value, the hydraulic pump may be experiencing wear, failure, or other performance degradation. This clear threshold judgment enhances the objectivity and reliability of performance evaluation, ensuring accurate and timely fault detection.

[0128] In some embodiments of the present application, the second determination unit includes a third setting module, a fourth setting module, a second combination module, and a second acquisition module. The third setting module is used to sequentially set the control current of the shut-off valve to a plurality of third preset values; the fourth setting module is used to sequentially set the control current target value of the hydraulic pump to a plurality of fourth preset values under each of the third preset values of the control current of the shut-off valve; the second combination module is used to combine the third preset values with the fourth preset values in pairs to obtain a plurality of the second preset working conditions; the second acquisition module is used to obtain the pressure increase value of the hydraulic pump within the preset time under each of the second preset working conditions to obtain a plurality of the hydraulic pump pressure increase values, wherein the preset time is determined based on the actual performance deviation of different excavator models.

[0129] By setting multiple current combinations for the shut-off valve and hydraulic pump under dynamic loading, a variety of second preset operating conditions are formed. This can capture the pressure change characteristics of the hydraulic pump's step response and intuitively reflect the dynamic performance status of the hydraulic pump. The pressure increase values collected within the preset time are calibrated against the actual performance deviations of different models to ensure the rationality of the test time, thereby improving the accuracy and reliability of the evaluation results. Not only can abnormal performance of the hydraulic pump under dynamic conditions be promptly identified, but the response speed and load adaptability of the hydraulic pump can also be evaluated. This provides an important basis for on-site fault diagnosis and preventive maintenance of excavators, effectively ensuring the safety and efficiency of equipment operation.

[0130] In some embodiments of the present application, the second determination unit includes a second calculation module and a second comparison module. The second calculation module is used to subtract the corresponding second preset standard pressure value from each of the plurality of hydraulic pump pressure increase values to obtain the plurality of second pressure deviations, wherein the second preset standard pressure value is obtained based on the statistical results of a plurality of sample excavators; and the second comparison module is used to obtain the absolute values of the plurality of second pressure deviations to obtain a plurality of second absolute values, and to compare the plurality of second absolute values with the second preset pressure deviation threshold value in turn to obtain the plurality of second comparison results, wherein the second preset pressure deviation threshold value is determined based on the actual performance deviation of different excavator models and the requirements of the corresponding test items during the test process.

[0131] By comparing the hydraulic pump's pressure increase under dynamic conditions with a statistically determined second preset standard pressure value, the dynamic performance deviation of the hydraulic pump is precisely quantified. A standard pressure value (the second preset pressure deviation threshold) established based on statistical results from a sample excavator ensures that the performance evaluation benchmark closely matches actual operating conditions. By calculating the deviation between the actual pressure increase and the preset standard value, eliminating directional influences using absolute values, and comparing this value with the second preset pressure deviation threshold, the performance of the hydraulic pump under dynamic loading can be objectively determined.

[0132] Furthermore, the second determination unit includes a third determination module and a fourth determination module. The third determination module is configured to determine that the performance of the hydraulic pump is normal if the plurality of second comparison results are all less than or equal to a second preset standard value; and the fourth determination module is configured to determine that the performance of the hydraulic pump is abnormal if at least one of the plurality of second comparison results is greater than the second preset standard value.

[0133] By systematically analyzing the hydraulic pump's pressure changes during dynamic loading, we can accurately determine the health of its dynamic performance. When the deviations of all dynamic test results are within a reasonable second preset standard value, it proves that the hydraulic pump exhibits stable and normal response characteristics when subjected to transient load changes, ensuring the reliability of the excavator's dynamic performance during operation. Conversely, if the pressure change under any test condition exceeds the preset standard, it immediately reveals possible anomalies or potential failures in the hydraulic pump, avoiding equipment safety hazards and operation interruptions caused by dynamic performance failure. This greatly improves the accuracy of dynamic performance monitoring, strengthens the fault warning mechanism, reduces maintenance costs and downtime caused by dynamic performance anomalies, and provides a solid guarantee for the efficient and safe operation of the excavator.

[0134] In other embodiments of the present application, the static working condition is the state in which the hydraulic pump operates under the first preset control parameters, and the dynamic working condition is the state in which the hydraulic pump is in the existing operating state and the control parameters are adjusted to the state in which the hydraulic pump operates under the second preset control parameters, wherein the first preset control parameters include the control current of the shut-off valve and the control current of the hydraulic pump, and the second preset control parameters include the control current of the shut-off valve and the control current target value of the hydraulic pump.

[0135] Static operating condition assessments ensure that the hydraulic pump meets performance standards at stable operating points, while dynamic operating condition assessments verify the pump's performance stability under unexpected operating conditions. This comprehensive assessment approach helps identify potential hydraulic pump issues early, improving excavator maintenance efficiency and operational safety. It also reduces unplanned downtime and maintenance costs caused by hydraulic pump performance deficiencies, ultimately enhancing overall excavator operation reliability and economic efficiency.

[0136] In some further embodiments of the present application, the apparatus further comprises an output unit and a fault detection unit. The output unit is configured to output a current combination corresponding to the first comparison result greater than the first preset standard value after determining that the performance of the hydraulic pump is abnormal if at least one of the plurality of first comparison results is greater than the first preset standard value, wherein the current combination includes the control current of the shut-off valve and the control current of the hydraulic pump; and the fault detection unit is configured to perform fault detection on the hydraulic pump based on the current combination.

[0137] Based on the above current combinations, further in-depth fault detection of the hydraulic pump can be performed. This means that by analyzing under which specific current combinations the hydraulic pump's performance is abnormal, the relevant components or system configuration of the hydraulic pump can be specifically inspected to determine the specific problem. The fault detection process may include inspections of the wear of the hydraulic pump's internal parts, the responsiveness of the shut-off valve, and the accuracy of the electronic control system's signal transmission. Compared to relying solely on the operator's experience and judgment, this fault detection method based on abnormal current combinations can locate the cause of the fault more quickly and accurately, thereby improving maintenance efficiency and reducing unnecessary equipment downtime.

[0138] The excavator hydraulic pump performance evaluation device includes a processor and a memory. The first determination unit, the second determination unit, and the like are stored as program units in the memory. The processor executes the program units stored in the memory to implement the corresponding functions. The modules are all located in the same processor; alternatively, the modules can be located in different processors in any combination.

[0139] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0140] An embodiment of the present invention provides a computer-readable storage medium, which includes a stored program. When the program is executed, the device where the computer-readable storage medium is located is controlled to execute the performance evaluation method for the excavator hydraulic pump.

[0141] An embodiment of the present invention provides a processor, which is used to run a program, wherein the performance evaluation method of the excavator hydraulic pump is executed when the program is run.

[0142] An embodiment of the present invention provides an electronic device comprising a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, the steps of the aforementioned method for evaluating the performance of an excavator hydraulic pump are implemented. The device herein may be a server, a PC, a PAD, a mobile phone, or the like.

[0143] The present application also provides a computer program product, which, when executed on a data processing device, is adapted to execute a program that initiates the steps of the above-mentioned excavator hydraulic pump performance evaluation method.

[0144] Obviously, those skilled in the art will appreciate that the various modules or steps of the present invention described above can be implemented using a general-purpose computing device, can be centralized on a single computing device, or can be distributed across a network of multiple computing devices. They can be implemented using program code executable by the computing device, and thus, can be stored in a storage device and executed by the computing device. In some cases, the steps shown or described herein can be performed in a different order than that shown, or can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0145] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. 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 magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0146] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0147] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0148] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0149] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0150] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0151] Computer-readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (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.

[0152] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0153] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A performance evaluation method for an excavator hydraulic pump, characterized in that: include: When the hydraulic pump is in a static working condition, obtaining pressure values of the hydraulic pump under a plurality of first preset working conditions to obtain a plurality of hydraulic pump pressure values, and obtaining a plurality of first pressure deviations based on the plurality of hydraulic pump pressure values, respectively comparing the plurality of first pressure deviations with a first preset pressure deviation threshold to obtain a plurality of first comparison results, and determining whether the performance of the hydraulic pump is normal based on the plurality of first comparison results, wherein the first preset working condition is set based on a control current of a shut-off valve and a control current of the hydraulic pump; When the hydraulic pump is in a dynamic working condition, the pressure increase values of the hydraulic pump under multiple second preset working conditions are obtained within a preset time to obtain multiple hydraulic pump pressure increase values, and multiple second pressure deviations are obtained based on the multiple hydraulic pump pressure increase values. The multiple second pressure deviations are respectively compared with second preset pressure deviation thresholds to obtain multiple second comparison results, and whether the performance of the hydraulic pump is normal is determined based on the multiple second comparison results, wherein the second preset working condition is set based on the control current of the shut-off valve and the control current target value of the hydraulic pump.

2. The method according to claim 1, characterized in that When the hydraulic pump is in a static working condition, the pressure values of the hydraulic pump under multiple first preset working conditions are obtained to obtain multiple hydraulic pump pressure values, including: sequentially setting the control current of the shut-off valve to a plurality of first preset values; At each of the first preset values of the control current of the shut-off valve, sequentially setting the control current of the hydraulic pump to a plurality of second preset values; Combining the first preset value and the second preset value in pairs to obtain a plurality of the first preset working conditions; Under each of the first preset working conditions, the pressure value of the hydraulic pump is acquired to obtain a plurality of the hydraulic pump pressure values.

3. The method according to claim 1, characterized in that A plurality of first pressure deviations are obtained based on the plurality of hydraulic pump pressure values, and the plurality of first pressure deviations are respectively compared with a first preset pressure deviation threshold to obtain a plurality of first comparison results, including: subtracting corresponding first preset standard pressure values from the plurality of hydraulic pump pressure values to obtain a plurality of first pressure deviations, wherein the first preset standard pressure values are obtained based on statistical results of a plurality of sample excavators; Obtain multiple absolute values of the first pressure deviations to obtain multiple first absolute values, and compare the multiple first absolute values with the first preset pressure deviation threshold in turn to obtain multiple first comparison results, wherein the first preset pressure deviation threshold is determined based on the actual performance deviation of different excavator models and the requirements for corresponding test items during the test process.

4. The method according to claim 1, wherein Determining whether the performance of the hydraulic pump is normal according to the plurality of first comparison results includes: If the plurality of first comparison results are all less than or equal to a first preset standard value, it is determined that the performance of the hydraulic pump is normal; If at least one of the plurality of first comparison results is greater than the first preset standard value, it is determined that the performance of the hydraulic pump is abnormal.

5. The method according to claim 1, wherein When the hydraulic pump is in a dynamic working condition, the pressure increase values of the hydraulic pump under a plurality of second preset working conditions are obtained within a preset time, to obtain a plurality of hydraulic pump pressure increase values, including: sequentially setting the control current of the shut-off valve to a plurality of third preset values; At each of the third preset values of the control current of the shut-off valve, the control current target value of the hydraulic pump is sequentially set to a plurality of fourth preset values; Combining the third preset value and the fourth preset value in pairs to obtain a plurality of the second preset operating conditions; Under each of the second preset working conditions, the pressure increase value of the hydraulic pump is obtained within the preset time to obtain a plurality of the hydraulic pump pressure increase values, wherein the preset time is determined based on actual performance deviations of different excavator models.

6. The method according to claim 1, characterized in that A plurality of second pressure deviations are obtained based on the plurality of hydraulic pump pressure increase values, and the plurality of second pressure deviations are respectively compared with a second preset pressure deviation threshold to obtain a plurality of second comparison results, including: subtracting corresponding second preset standard pressure values from the plurality of hydraulic pump pressure increase values to obtain a plurality of second pressure deviations, wherein the second preset standard pressure values are obtained based on statistical results of a plurality of sample excavators; Obtain multiple absolute values of the second pressure deviation to obtain multiple second absolute values, and compare the multiple second absolute values with the second preset pressure deviation threshold in turn to obtain multiple second comparison results, wherein the second preset pressure deviation threshold is determined based on the actual performance deviation of different excavator models and the requirements for corresponding test items during the test process.

7. The method according to claim 1, characterized in that Determining whether the performance of the hydraulic pump is normal according to the plurality of second comparison results includes: If the plurality of second comparison results are all less than or equal to a second preset standard value, determining that the performance of the hydraulic pump is normal; If at least one of the plurality of second comparison results is the first comparison result that is greater than the second preset standard value, it is determined that the performance of the hydraulic pump is abnormal.

8. The method according to claim 1, characterized in that The static operating condition is the state in which the hydraulic pump operates under the first preset control parameters, and the dynamic operating condition is the state in which the hydraulic pump is in the existing operating state and the control parameters are adjusted to the state in which it operates under the second preset control parameters, wherein the first preset control parameters include the control current of the shut-off valve and the control current of the hydraulic pump, and the second preset control parameters include the control current of the shut-off valve and the control current target value of the hydraulic pump.

9. The method according to claim 4, characterized in that If at least one of the plurality of first comparison results is greater than the first preset standard value, after determining that the performance of the hydraulic pump is abnormal, the method further includes: outputting a current combination corresponding to the first comparison result that is greater than the first preset standard value, wherein the current combination includes a control current of the shut-off valve and a control current of the hydraulic pump; Fault detection of the hydraulic pump is performed based on the current combination.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the performance evaluation method for the excavator hydraulic pump according to any one of claims 1 to 9.

Images