Method and device for judging internal leakage of hydraulic pump
By analyzing engine torque and fuel consumption data with hydraulic pump pressure data through a CAN bus, the method and device accurately detect hydraulic pump leakage without additional sensors, reducing costs and enhancing monitoring capabilities in excavators and bulldozers.
Patent Information
- Application Number
- CN202411128480.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2024-12-13
AI Technical Summary
The existing methods for determining hydraulic pump internal leakage in excavators and bulldozers require the installation of acceleration sensors and high-frequency acquisition devices, increasing equipment cost and complexity.
A method and device that utilize engine torque percentage data, instantaneous fuel consumption data, and outlet pressure data from a CAN bus to analyze time series data, calculating variances and thresholds to determine hydraulic pump leakage without the need for acceleration sensors.
Reduces costs and improves accuracy in detecting hydraulic pump internal leakage by eliminating the need for additional sensors, allowing for long-term monitoring of hydraulic pumps in mechanical equipment.
Smart Images
Figure CN119128667A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of pumps, and in particular to a method and a device for judging whether a hydraulic pump has internal leakage. Background Art
[0002] Excavators, bulldozers and other mechanical equipment are equipped with hydraulic pumps, which are usually plunger pumps. Hydraulic pump failures include seal failure, bearing failure and pump body cracking. Among them, seal failure will directly lead to internal leakage of the hydraulic pump. Seal failure can be divided into seal wear and aging and valve failure. In general, the main failure of hydraulic pumps is internal leakage, and bearing failure and pump body cracking account for a relatively small proportion. If the hydraulic pump leaks internally, the hydraulic oil will not be effectively delivered to the target location.
[0003] In order to determine whether the hydraulic pump has internal leakage, the current solution is mainly to install an acceleration sensor on the hydraulic pump. The controller collects the vibration signal of the hydraulic pump through the acceleration sensor. The controller determines whether the vibration signal is greater than the threshold. If so, it is determined that the hydraulic pump has internal leakage; if not, it is determined that the hydraulic pump has no internal leakage.
[0004] However, in order to determine whether the hydraulic pump has internal leakage, acceleration sensors and corresponding high-frequency acquisition devices are configured in mechanical equipment such as excavators and bulldozers, which increases the cost of the mechanical equipment. Summary of the invention
[0005] The present invention provides a method and device for judging whether a hydraulic pump has internal leakage, so as to solve the technical problem that an acceleration sensor and a corresponding high-frequency acquisition device need to be configured in mechanical equipment such as excavators and bulldozers in order to judge whether a hydraulic pump has internal leakage.
[0006] In order to solve the above technical problems, the present invention provides a method for determining whether a hydraulic pump has internal leakage, comprising the following steps:
[0007] Obtaining the torque percentage data of the engine, the instantaneous fuel consumption data of the engine and the outlet pressure data of the hydraulic pump; wherein the engine is used to drive the hydraulic pump;
[0008] Based on the time series, the torque percentage data of the engine, the instantaneous fuel consumption data of the engine and the outlet pressure data of the hydraulic pump are respectively spliced to obtain corresponding time series data;
[0009] Dividing the time series data corresponding to the torque percentage data of the engine, the time series data corresponding to the instantaneous fuel consumption data of the engine, and the time series data corresponding to the outlet pressure data of the hydraulic pump into multiple segments based on the time series;
[0010] Calculate the variance of the time series data corresponding to the torque percentage data of the engine in each time period, and determine whether the variance in each time period is less than a first threshold value; if so, respectively calculate the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine in the time period, and the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump; if not, end this determination;
[0011] Determine whether the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine is greater than a second threshold, and whether the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump is less than a third threshold; if so, determine that the hydraulic pump has an internal leakage; if not, determine that the hydraulic pump has no internal leakage.
[0012] Optionally, between the step of determining whether the variance in each period of time is less than a first threshold and the step of determining whether the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine is greater than a second threshold, and whether the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump is less than a third threshold, the following steps are also included:
[0013] Determine the region where the time series data corresponding to the torque percentage data of the engine within the time period is located, and obtain the second threshold and the third threshold corresponding to the region.
[0014] Optionally, after the step of determining whether the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine is greater than a second threshold, and whether the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump is less than a third threshold, the following steps are also included: displaying the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine, the second threshold, the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump, the third threshold, and text information indicating whether the hydraulic pump has internal leakage or not.
[0015] Optionally, the method further includes the following steps: acquiring and displaying a vehicle number corresponding to the hydraulic pump.
[0016] Optionally, the method further includes the following steps: acquiring and displaying the rotation speed of the engine.
[0017] The present invention also provides a device for determining whether a hydraulic pump has internal leakage, comprising the following modules:
[0018] An acquisition module, used to acquire the torque percentage data of the engine, the instantaneous fuel consumption data of the engine and the outlet pressure data of the hydraulic pump; wherein the engine is used to drive the hydraulic pump;
[0019] A splicing module, used for splicing the torque percentage data of the engine, the instantaneous fuel consumption data of the engine and the outlet pressure data of the hydraulic pump respectively based on the time sequence to obtain corresponding time sequence data;
[0020] A segmentation module, for dividing the time series data corresponding to the torque percentage data of the engine, the time series data corresponding to the instantaneous fuel consumption data of the engine, and the time series data corresponding to the outlet pressure data of the hydraulic pump into multiple segments based on the time series;
[0021] A first judgment module is used to calculate the variance of the time series data corresponding to the torque percentage data of the engine in each period of time, and judge whether the variance in each period of time is less than a first threshold value. If yes, the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine in the period of time, and the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump are calculated respectively; if no, the judgment is terminated;
[0022] The second judgment module is used to judge whether the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine is greater than the second threshold, and whether the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump is less than the third threshold. If so, it is determined that the hydraulic pump has an internal leakage; if not, it is determined that the hydraulic pump has no internal leakage.
[0023] Optionally, the first judgment module is further used to determine the area where the time series data corresponding to the torque percentage data of the engine within the time period is located, and obtain the second threshold and the third threshold corresponding to the area.
[0024] Optionally, the device also includes a display module, which is used to display the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine, the second threshold, the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump, and the third threshold, text information on whether the hydraulic pump is leaking or not.
[0025] Optionally, the display module is also used to obtain and display the vehicle number corresponding to the hydraulic pump.
[0026] Optionally, the display module is also used to obtain and display the rotation speed of the engine.
[0027] The present invention provides a method and device for judging whether a hydraulic pump has internal leakage. By processing the torque percentage data of the engine, the instantaneous fuel consumption data of the engine and the outlet pressure data of the hydraulic pump collected by CAN, it is possible to judge whether the hydraulic pump has internal leakage. It is no longer necessary to configure acceleration sensors and corresponding high-frequency acquisition devices in mechanical equipment such as excavators and bulldozers, thereby reducing costs and improving the accuracy of judging whether the hydraulic pump has internal leakage. The method can also monitor the hydraulic pump in mechanical equipment such as excavators and bulldozers for a long time. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 The present invention is a flowchart of a method for determining whether a hydraulic pump has internal leakage, provided by an embodiment of the present invention.
[0029] Figure 2 It is a schematic diagram of segmenting each time series data based on time series provided by an embodiment of the present invention.
[0030] Figure 3 It is a schematic diagram of the distribution of a second threshold value, time series data corresponding to the instantaneous fuel consumption data of the engine, and its maximum value and median provided by an embodiment of the present invention.
[0031] Figure 4 It is a schematic distribution diagram of a third threshold value, time series data corresponding to the outlet pressure data of a hydraulic pump, and its maximum value and median provided by an embodiment of the present invention. DETAILED DESCRIPTION
[0032] In order to make the purpose, advantages and features of the present invention more clear, the following is a further detailed description of a method and device for determining whether a hydraulic pump has internal leakage proposed by the present invention in conjunction with the accompanying drawings. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.
[0033] In the description of the present invention, the terms "first", "second", etc. are added for the convenience of description and reference, and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined by the terms "first", "second", etc. may explicitly or implicitly include one or more of the features.
[0034] like Figure 1 As shown, this embodiment provides a method for determining whether a hydraulic pump has internal leakage, comprising the following steps:
[0035] S1. Obtaining the engine torque percentage data, the engine instantaneous fuel consumption data and the hydraulic pump outlet pressure data; wherein the engine is used to drive the hydraulic pump; the controller can collect the engine torque percentage data, the engine instantaneous fuel consumption data and the hydraulic pump outlet pressure data through the CAN bus (Controller Area Network, controller local area network bus), and the current collection frequency can reach more than 1 Hz.
[0036] S2. Based on the time series, the torque percentage data of the engine, the instantaneous fuel consumption data of the engine and the outlet pressure data of the hydraulic pump are spliced to obtain the corresponding time series data; as shown in Table 1 below, when the CAN bus collects data, the data collected at the same time usually only includes part of the torque percentage data of the engine, the instantaneous fuel consumption data of the engine and the outlet pressure data of the hydraulic pump. At some moments, some data is not collected and forms a gap. As shown in Table 2 below, linear interpolation or nearest neighbor interpolation can be used to fill the missing data, so that the data at each sampling moment is as complete as possible, and the incomplete data can be discarded in the following steps.
[0037] Table 1 Data collected through CAN bus
[0038] time Parameter 1 Parameter 2 … Parameter n t1 a1 … t2 b1 … n1 t3 a2 … … b2 … n2 … … t6 a3 b3 … n3 … … … … …
[0039] Table 2 Time series data obtained by splicing the data in Table 1
[0040] time Parameter 1 Parameter 2 … Parameter n t1 a1 … t2 (a1+a2) / 2 b1 … n1 t3 a2 (b1+b2) / 2 … (n1+n2) / / 2 … (a2+a3) / 3 b2 … n2 … (a2+a3) / 3 (b2+b3) / 2 … (n2+n3) / / 2 tm a3 b3 … n3 … … … … …
[0041] S3, based on the time sequence, dividing the time sequence data corresponding to the torque percentage data of the engine, the time sequence data corresponding to the instantaneous fuel consumption data of the engine, and the time sequence data corresponding to the outlet pressure data of the hydraulic pump into multiple segments; Figure 2 As shown, each time series data can be evenly segmented according to time periods such as two seconds or three seconds. Figure 2 The vertical rectangle in the figure represents a segment into which the time series data is divided.
[0042] S4. Calculate the variance of the time series data corresponding to the torque percentage data of the engine in each time period, and determine whether the variance in each time period is less than a first threshold value. If so, respectively calculate the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine in the time period, and the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump; if not, end this judgment. After the calculation of the variance in each time period is completed, it can be determined whether the variance in the time period is less than the first threshold value. If the variance in a certain time period is less than the first threshold value, it means that the fluctuation amplitude of the engine's torque percentage data is small, and the engine is in a stable operation state, such as Figure 2 The time period where the vertical rectangle in the middle is located; if the variance in a certain time period is greater than or equal to the first threshold, it means that the fluctuation amplitude of the engine torque percentage data is large and the engine is in an unstable operation state. When the engine is in a stable operation state, the time series data corresponding to the instantaneous fuel consumption data of the engine and the time series data corresponding to the outlet pressure data of the hydraulic pump are analyzed to determine whether the hydraulic pump has internal leakage.
[0043] S5. Determine whether the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine is greater than the second threshold value, and whether the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump is less than the third threshold value. If yes, it is determined that the hydraulic pump has internal leakage; if not, it is determined that the hydraulic pump has no internal leakage. Through fault analysis of internal leakage of hydraulic pumps of mechanical equipment such as excavators and bulldozers, it is found that when the hydraulic pump has internal leakage, the instantaneous fuel consumption data of the engine will increase, and the outlet pressure data of the hydraulic pump will decrease. Therefore, if the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine is greater than the second threshold value, and the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump is less than the third threshold value, it indicates that the hydraulic pump has internal leakage; otherwise, it indicates that the hydraulic pump has internal leakage. When using this method, only one of the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine can be calculated, and then one of the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump can be calculated. Figure 3 and Figure 4 As shown in the figure, the dense dots in the figure represent the distribution of time series data, the black rectangle in the middle of the dense dots represents the median, and the short horizontal line above the dense dots represents the maximum value. Figure 3 In the rightmost graph, the median of the time series data corresponding to the instantaneous fuel consumption data of the engine is greater than the second threshold; Figure 4In the rightmost graph, the median of the time series data corresponding to the outlet pressure data of the hydraulic pump is less than the third threshold value, which indicates that the hydraulic pump has internal leakage during the 2024-02-04 period. Figure 3 and Figure 4 The leftmost graph in the figure indicates that the hydraulic pump has no internal leakage.
[0044] The present embodiment provides a method for determining whether a hydraulic pump has internal leakage. By processing the engine torque percentage data, the engine instantaneous fuel consumption data and the hydraulic pump outlet pressure data collected by CAN, it is possible to determine whether the hydraulic pump has internal leakage. It is no longer necessary to configure acceleration sensors and corresponding high-frequency acquisition devices in mechanical equipment such as excavators and bulldozers, thereby reducing costs and improving the accuracy of determining whether the hydraulic pump has internal leakage. The present method can also monitor the hydraulic pump in mechanical equipment such as excavators and bulldozers for a long time.
[0045] Optionally, between steps S4 and S5, that is, the step of judging whether the variance in each period of time is less than the first threshold and the step of judging whether the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine is greater than the second threshold, and whether the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump is less than the third threshold, the following steps are also included: judging the area where the time series data corresponding to the torque percentage data of the engine in the period of time is located, and obtaining the second threshold and the third threshold corresponding to the area. In order to make the judgment result more accurate, the time series data corresponding to the torque percentage data of the engine can be subdivided into four or more areas according to the size of the time series data corresponding to the torque percentage data of the engine, and each area corresponds to a different second threshold and third threshold.
[0046] Optional, reference Figure 3 and Figure 4As shown, after step S5, that is, after the step of judging whether the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine is greater than the second threshold value, and whether the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump is less than the third threshold value, the following steps are also included: displaying the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine, the second threshold value, the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump, the third threshold value, and text information of whether the hydraulic pump has internal leakage or not. By displaying this information on the display, the user can more intuitively understand the detailed parameters of the hydraulic pump and the engine. In specific use, the internal leakage can be subdivided into slight internal leakage and severe internal leakage, the second threshold value is changed to the second interval, and the third threshold value is changed to the third interval. When the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine is within the second interval, and the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump is within the third interval, it means that the hydraulic pump has slight internal leakage. When the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine is greater than the maximum value of the second interval, and the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump is greater than the maximum value of the third interval, it indicates that the hydraulic pump has serious internal leakage. The display can display the judgment result such as slight internal leakage or serious internal leakage of the hydraulic pump according to the judgment result of the controller.
[0047] Optional, reference Figure 3 and Figure 4 As shown, the method further includes the following steps: obtaining and displaying the vehicle number corresponding to the hydraulic pump. The vehicle number can be used to distinguish each vehicle and the hydraulic pump corresponding to each vehicle.
[0048] Optional, reference Figure 3 and Figure 4 As shown, the method further includes the following steps: obtaining and displaying the engine speed. By displaying the engine speed, the user can understand the engine speed in real time. When the hydraulic pump is found to have internal leakage, if the engine speed is high, the engine should be turned off in time. The gear position can be determined by the engine speed, and after the gear position is determined, the speed and gear position can be displayed on the display at the same time.
[0049] Based on the same technical concept as the above method for determining whether a hydraulic pump has internal leakage, this embodiment provides a device for determining whether a hydraulic pump has internal leakage, including the following modules:
[0050] An acquisition module, used to acquire the torque percentage data of the engine, the instantaneous fuel consumption data of the engine and the outlet pressure data of the hydraulic pump; wherein the engine is used to drive the hydraulic pump;
[0051] A splicing module, used for splicing the torque percentage data of the engine, the instantaneous fuel consumption data of the engine and the outlet pressure data of the hydraulic pump respectively based on the time sequence to obtain corresponding time sequence data;
[0052] A segmentation module, for dividing the time series data corresponding to the torque percentage data of the engine, the time series data corresponding to the instantaneous fuel consumption data of the engine, and the time series data corresponding to the outlet pressure data of the hydraulic pump into multiple segments based on the time series;
[0053] A first judgment module is used to calculate the variance of the time series data corresponding to the torque percentage data of the engine in each period of time, and judge whether the variance in each period of time is less than a first threshold value. If yes, the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine in the period of time, and the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump are calculated respectively; if no, the judgment is terminated;
[0054] The second judgment module is used to judge whether the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine is greater than the second threshold, and whether the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump is less than the third threshold. If so, it is determined that the hydraulic pump has an internal leakage; if not, it is determined that the hydraulic pump has no internal leakage.
[0055] The present embodiment provides a device for determining whether a hydraulic pump has internal leakage. By processing the engine torque percentage data, the engine instantaneous fuel consumption data and the hydraulic pump outlet pressure data collected by CAN, it is possible to determine whether the hydraulic pump has internal leakage. It is no longer necessary to configure acceleration sensors and corresponding high-frequency acquisition devices in mechanical equipment such as excavators and bulldozers, thereby reducing costs and improving the accuracy of determining whether the hydraulic pump has internal leakage. The device can also perform long-term monitoring of hydraulic pumps in mechanical equipment such as excavators and bulldozers.
[0056] Optionally, the first judgment module is further used to judge the region where the time series data corresponding to the engine torque percentage data within the time period is located, and obtain the second threshold and the third threshold corresponding to the region. In order to make the judgment result more accurate, the time series data corresponding to the engine torque percentage data can be subdivided into four or more regions according to the size of the time series data corresponding to the engine torque percentage data, and each region corresponds to a different second threshold and third threshold.
[0057] Optionally, the device further includes a display module, which is used to display the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine, the second threshold, the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump, and the third threshold, text information of whether the hydraulic pump has internal leakage or not. Displaying this information on the display can enable the user to understand the detailed parameters of the hydraulic pump and the engine more intuitively.
[0058] Optionally, the display module is further used to obtain and display the vehicle number corresponding to the hydraulic pump. The vehicle number can be used to distinguish each vehicle and the hydraulic pump corresponding to each vehicle.
[0059] Optionally, the display module is also used to obtain and display the engine speed. By displaying the engine speed, the user can understand the engine speed in real time. When the hydraulic pump is found to have internal leakage, if the engine speed is high, the engine should be turned off in time.
[0060] In summary, the method and device provided by the present invention for judging whether a hydraulic pump has internal leakage can judge whether a hydraulic pump has internal leakage by processing the torque percentage data of the engine, the instantaneous fuel consumption data of the engine and the outlet pressure data of the hydraulic pump collected by CAN, and it is no longer necessary to configure acceleration sensors and corresponding high-frequency acquisition devices in mechanical equipment such as excavators and bulldozers, thereby reducing costs and improving the accuracy of judging whether a hydraulic pump has internal leakage. The method can also monitor the hydraulic pump in mechanical equipment such as excavators and bulldozers for a long time.
[0061] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art based on the above disclosure shall fall within the protection scope of the present invention.
Claims
1. A method for determining whether a hydraulic pump has internal leakage, characterized in that: The following steps are involved: Obtaining the torque percentage data of the engine, the instantaneous fuel consumption data of the engine and the outlet pressure data of the hydraulic pump; wherein the engine is used to drive the hydraulic pump; Based on the time series, the torque percentage data of the engine, the instantaneous fuel consumption data of the engine and the outlet pressure data of the hydraulic pump are respectively spliced to obtain corresponding time series data; Dividing the time series data corresponding to the torque percentage data of the engine, the time series data corresponding to the instantaneous fuel consumption data of the engine, and the time series data corresponding to the outlet pressure data of the hydraulic pump into multiple segments based on the time series; Calculate the variance of the time series data corresponding to the torque percentage data of the engine in each time period, and determine whether the variance in each time period is less than a first threshold value; if so, respectively calculate the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine in the time period, and the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump; if not, end this determination; Determine whether the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine is greater than a second threshold, and whether the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump is less than a third threshold; if so, determine that the hydraulic pump has an internal leakage; if not, determine that the hydraulic pump has no internal leakage.
2. A method for determining whether a hydraulic pump has internal leakage as claimed in claim 1, characterized in that: Between the step of determining whether the variance in each period of time is less than a first threshold and the step of determining whether the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine is greater than a second threshold, and whether the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump is less than a third threshold, the following steps are also included: Determine the region where the time series data corresponding to the torque percentage data of the engine within the time period is located, and obtain the second threshold and the third threshold corresponding to the region.
3. A method for determining whether a hydraulic pump has internal leakage as claimed in claim 1, characterized in that: After the step of determining whether the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine is greater than the second threshold, and whether the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump is less than the third threshold, the following steps are also included: displaying the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine, the second threshold, the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump, the third threshold, and text information on whether the hydraulic pump has internal leakage or not.
4. A method for determining whether a hydraulic pump has internal leakage as claimed in claim 3, characterized in that: The method further comprises the following steps: acquiring and displaying a vehicle number corresponding to the hydraulic pump.
5. A method for determining whether a hydraulic pump has internal leakage as claimed in claim 3, characterized in that: The method further comprises the following steps: acquiring and displaying the rotation speed of the engine.
6. A device for determining whether a hydraulic pump has internal leakage, characterized in that: Includes the following modules: An acquisition module, used to acquire the torque percentage data of the engine, the instantaneous fuel consumption data of the engine and the outlet pressure data of the hydraulic pump; wherein the engine is used to drive the hydraulic pump; A splicing module, used for splicing the torque percentage data of the engine, the instantaneous fuel consumption data of the engine and the outlet pressure data of the hydraulic pump respectively based on the time sequence to obtain corresponding time sequence data; A segmentation module, for dividing the time series data corresponding to the torque percentage data of the engine, the time series data corresponding to the instantaneous fuel consumption data of the engine, and the time series data corresponding to the outlet pressure data of the hydraulic pump into multiple segments based on the time series; A first judgment module is used to calculate the variance of the time series data corresponding to the torque percentage data of the engine in each period of time, and judge whether the variance in each period of time is less than a first threshold value. If yes, the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine in the period of time, and the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump are calculated respectively; if no, the judgment is terminated; The second judgment module is used to judge whether the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine is greater than the second threshold, and whether the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump is less than the third threshold. If so, it is determined that the hydraulic pump has an internal leakage; if not, it is determined that the hydraulic pump has no internal leakage.
7. A device for determining whether a hydraulic pump has internal leakage as claimed in claim 6, characterized in that: The first judgment module is further used to judge the region where the time series data corresponding to the torque percentage data of the engine within the time period is located, and obtain the second threshold and the third threshold corresponding to the region.
8. A device for determining whether a hydraulic pump has internal leakage as claimed in claim 6, characterized in that: The device also includes a display module, which is used to display the average value, maximum value, median or sum of the time series data corresponding to the instantaneous fuel consumption data of the engine, the second threshold, the average value, maximum value, median or sum of the time series data corresponding to the outlet pressure data of the hydraulic pump, and the third threshold, text information on whether the hydraulic pump has internal leakage or not.
9. A device for determining whether a hydraulic pump has internal leakage as claimed in claim 8, characterized in that: The display module is also used to obtain and display the vehicle number corresponding to the hydraulic pump.
10. A device for determining whether a hydraulic pump has internal leakage as claimed in claim 8, characterized in that: The display module is also used to obtain and display the rotation speed of the engine.