An inspection device and inspection method for an electro-hydraulic pump

Abstract

The present invention relates to a detection device and a detection method for an electro-hydraulic pump. The detection device includes an oil tank, a first electro-control proportional relief valve, a first pressure sensor, a first flow sensor, and a controller. A first valve port of the first electro-control proportional relief valve is communicated with a first oil port of a hydraulic pump body through a first pipeline, and a second valve port is connected to one end of the first pipeline; the first pressure sensor is connected to the first pipeline; the first flow sensor is connected to the first pipeline. The controller is respectively connected to data output ends of the first pressure sensor and the first flow sensor, and the controller can detect the electro-hydraulic pump according to first hydraulic data, first flow data, and set standard hydraulic data and standard flow data. It can not only efficiently detect system parameters under the condition of linear change of the load of the electro-hydraulic pump, but also improve the accuracy of judgment of the electro-hydraulic pump.

Description

Technical Field

[0001] The present invention relates to the field of detection of electro - hydraulic pumps, and particularly to a detection device and a detection method for an electro - hydraulic pump under non - linear load conditions. Background Art

[0002] An electro - hydraulic pump is a hydraulic component that provides pressurized liquid for hydraulic transmission. The electro - hydraulic pump converts mechanical energy into hydraulic energy of the liquid through an electric motor. When the electro - hydraulic pump is working, its working parameters such as current, system pressure, and system flow rate are related to the load, and the working parameters will change with the change of the load.

[0003] Before leaving the factory, the electro - hydraulic pump needs to be detected to ensure that it meets the regulations. At present, the detection efficiency of the electro - hydraulic pump is low, and the detection accuracy cannot be guaranteed. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a detection device and a detection method for an electro - hydraulic pump to solve the technical defects existing in the prior art.

[0005] The present invention provides a detection device for an electro - hydraulic pump. The electro - hydraulic pump includes an electric motor and a hydraulic pump body, and the hydraulic pump body has a first oil port and a second oil port. The detection device includes an oil tank, a first electro - controlled proportional relief valve, a first pressure sensor, a first flow sensor, and a controller. The oil tank can store oil.

[0006] The first electro - controlled proportional relief valve 30 has a first valve port and a second valve port. The first valve port is connected to the first oil port of the hydraulic pump body through a first pipeline, and the second valve port is connected to one end of the first pipeline. The other end of the first pipeline extends below the liquid level of the oil in the oil tank.

[0007] The first pressure sensor is connected to the first pipeline, and the first pressure sensor can collect the first hydraulic data in the first pipeline. The first flow sensor is connected to the first pipeline, and the first flow sensor can collect the first flow data in the first pipeline.

[0008] The controller is respectively connected to the data output ends of the first pressure sensor and the first flow sensor. The controller can detect the electro - hydraulic pump according to the first hydraulic data, the first flow data, and the set standard hydraulic data and standard flow data.

[0009] The present invention also provides a detection method for an electro - hydraulic pump, including:

[0010] S101: Calibrate a standard electro - hydraulic pump to obtain standard system parameters; the standard system parameters include standard hydraulic data and standard flow data;

[0011] S102: Set the pressure tolerance band and the flow tolerance band corresponding to the standard hydraulic data and the standard flow data respectively, and the controller receives the set pressure tolerance band and the flow tolerance band.

[0012] S103: Zero the first flow sensor and the first pressure sensor, and set the first electro-hydraulic proportional relief valve to fully open.

[0013] S104: Start the motor to drive the electric hydraulic pump body to rotate forward; the controller sends an opening reduction instruction to the first electro-hydraulic proportional relief valve, and the opening of the first electro-hydraulic proportional relief valve gradually decreases from the maximum, so that the load of the electric hydraulic pump under the forward rotation condition gradually increases.

[0014] S105: The controller receives the first pressure data of the first pressure sensor and the first flow data of the first flow sensor, and the controller calculates the hydraulic difference between the first pressure data of the first pressure sensor and the standard hydraulic data at the same time point.

[0015] S106: The controller determines whether the hydraulic difference at each time point under the forward rotation condition is within the set pressure tolerance band. If so, execute step S107; if not, the pressure of the electric hydraulic pump under the forward rotation condition is unqualified.

[0016] S107: The controller calculates the flow difference between the first flow data and the standard flow data at the same time point; the controller determines whether the flow difference is within the set flow tolerance band. If so, the electric hydraulic pump is qualified under the forward rotation condition; if not, the flow of the electric hydraulic pump under the forward rotation condition is unqualified.

[0017] The technical effect of the present invention is that the load of the electric hydraulic pump is adjusted by the set first electro-hydraulic proportional relief valve, realizing the operation of the electric hydraulic pump under the simulated load. In this way, by detecting the system parameters corresponding to the dotted load, it is equivalent to detecting the system parameters corresponding to each load on the solid load curve.

[0018] The first pressure sensor and the first flow sensor are used to collect the first hydraulic data and the first flow data in the first pipeline under different loads. The controller can judge whether the hydraulic pressure of the electric hydraulic pump under the current load is qualified according to the first hydraulic data and the standard hydraulic data. Similarly, the controller can judge whether the flow of the electric hydraulic pump under the current load is qualified according to the standard flow data and the first flow data.

[0019] The present invention can not only detect system parameters under all working conditions (from no-load to overload) of an electro-hydraulic pump, improving the accuracy of judgment of the electro-hydraulic pump, but also realizes efficient detection of system parameters under non-linear load changes of the electro-hydraulic pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of a detection device for an electro-hydraulic pump in an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of the non-linear change of the load of the electro-hydraulic pump over time;

[0022] Figure 3 is a schematic flowchart of a detection method for an electro-hydraulic pump in an embodiment of the present invention;

[0023] Figure 4a is a schematic diagram of the change of pressure over time after calibration of a standard electro-hydraulic pump;

[0024] Figure 4b is a schematic diagram of the change of flow rate over time after calibration of a standard electro-hydraulic pump;

[0025] Figure 4c is Figure 4a and Figure 4b a coordinate diagram after fitting two small coordinate diagrams.

[0026] Figure 4d is a schematic diagram of the change of pressure and flow rate over time respectively after setting a tolerance band in the present invention;

[0027] Figure 5 is a schematic diagram of the change of a simulated load curve over time in the present invention;

[0028] Figure 6 is a schematic flowchart of a detection method for an electro-hydraulic pump in an embodiment of the present invention;

[0029] Figure 7a is a schematic diagram of the change of standard current data over time after calibration of a standard electro-hydraulic pump;

[0030] Figure 7b is a schematic diagram of the change of standard decibel data over time after calibration of a standard electro-hydraulic pump;

[0031] Figure 7c is a schematic diagram after fitting standard current data, standard decibel data, standard pressure data and standard flow rate data after calibration of a standard electro-hydraulic pump;

[0032] Figure 8a is a coordinate diagram of the change of standard pressure data over time after setting a time interval in the present invention;

[0033] Figure 8b A coordinate diagram showing the change of standard flow data over time after setting a time interval;

[0034] Figure 8c A coordinate diagram showing the change of standard current data over time after setting a time interval;

[0035] Figure 8d A coordinate diagram showing the change of standard noise data over time after setting a time interval. Detailed implementation manners

[0036] Embodiment 1

[0037] Figure 1 The detection device of the electro - hydraulic pump in this embodiment is shown. The electro - hydraulic pump 10 includes a motor 11 and a hydraulic pump body 12. The hydraulic pump body 12 has a first oil port and a second oil port; the detection device includes an oil tank 20, a first electro - controlled proportional overflow valve 30, a first pressure sensor 31, a first flow sensor 32 and a controller. The oil tank 20 can store oil. The position of the oil tank 20 should be higher than the detection horizontal plane to ensure that there is no gas inside the hydraulic pipeline.

[0038] The first electro - controlled proportional overflow valve 30 has a first valve port and a second valve port. The first valve port is connected to the first oil port of the hydraulic pump body 12 through a first pipeline 51, and the second valve port is connected to one end of the first pipeline 51; the other end of the first pipeline 51 extends below the liquid level of the oil in the oil tank 20.

[0039] The first pressure sensor 31 is connected to the first pipeline 51, and the first pressure sensor can collect the first hydraulic data in the first pipeline 51; the first flow sensor 32 is connected to the first pipeline 51, and the first flow sensor can collect the first flow data in the first pipeline 51.

[0040] The controller is respectively connected to the data output ends of the first pressure sensor 31 and the first flow sensor 32. The controller can detect the electro - hydraulic pump according to the first hydraulic data, the first flow data, as well as the set standard hydraulic data and standard flow data.

[0041] Figure 2 A schematic diagram showing the non - linear change of the load of the electro - hydraulic pump over time is shown. Such an electro - hydraulic pump can be applied to the hydraulic components of an automotive electric tailgate. The present invention is directed to the detection of an electro - hydraulic pump under the condition that the load changes irregularly over time during the working process.

[0042] It should be noted that, due to the irregular change of the load of the electro - hydraulic pump over time, when detecting the electro - hydraulic pump under different loads, not only is the detection efficiency of the system parameters of the electro - hydraulic pump low, but also the detection accuracy of the electro - hydraulic pump is low.

[0043] Figure 3 The flowchart shows a detection method for an electro-hydraulic pump, including steps S101 to S107.

[0044] S101: Calibrate the standard electro-hydraulic pump to obtain standard system parameters; the standard system parameters include standard hydraulic data and standard flow data.

[0045] The standard electro-hydraulic pump can be understood as a qualified product. By calibrating the standard electro-hydraulic pump to obtain standard system parameters, that is, obtaining the standard system parameters corresponding to each load point during the operation of the standard electro-hydraulic pump.

[0046] Figure 4a is a schematic diagram showing the change of pressure with time after the calibration of the electro-hydraulic pump, Figure 4b is a schematic diagram showing the change of flow rate with time after the calibration of the electro-hydraulic pump. Figure 4c is Figure 4a and Figure 4b a coordinate diagram after fitting two small coordinate diagrams.

[0047] S102: Set the pressure tolerance band and flow tolerance band corresponding to the standard hydraulic data and standard flow data respectively, and the controller receives the set pressure tolerance band and flow tolerance band.

[0048] That is, after setting the tolerances of the standard hydraulic data and the standard flow data, such as the tolerance band shown in Figure 4d shown.

[0049] S103: Zero the first flow sensor and the first pressure sensor, and set the first electro-hydraulic proportional relief valve to fully open.

[0050] S104: Start the motor to drive the electro-hydraulic pump body to rotate forward; the controller sends an opening reduction instruction to the first electro-hydraulic proportional relief valve, and the opening of the first electro-hydraulic proportional relief valve gradually decreases from the maximum, so that the load of the electro-hydraulic pump increases gradually under the forward rotation condition.

[0051] By controlling the opening of the first electro-hydraulic proportional relief valve to gradually decrease through the controller, the hydraulic pressure in the first pipeline 51 gradually increases, and thus the load of the electro-hydraulic pump increases accordingly.

[0052] S105: The controller receives the first pressure data of the first pressure sensor and the first flow data of the first flow sensor, and the controller calculates the hydraulic difference between the first pressure data of the first pressure sensor and the standard hydraulic data at the same time point.

[0053] S106: The controller determines whether the hydraulic pressure difference at each time point under the forward rotation condition is within the set pressure tolerance band. If so, step S107 is executed; if not, the pressure of the electro-hydraulic pump under the forward rotation condition is unqualified.

[0054] After the motor starts, it drives the hydraulic pump body to rotate forward, and the measured system parameters corresponding to the load of the electro-hydraulic pump under the forward rotation condition are obtained.

[0055] S107: The controller calculates the flow difference between the first flow data and the standard flow data at the same time point; the controller determines whether the flow difference is within the set flow tolerance band. If so, the electro-hydraulic pump is qualified under the forward rotation condition; if not, the flow of the electro-hydraulic pump under the forward rotation condition is unqualified.

[0056] As Figure 5 shown, given the load range A1 of the standard electro-hydraulic pump, in the present invention, by adjusting the opening degree of the first electro-controlled proportional relief valve, as the opening degree of the first electro-controlled proportional relief valve decreases, the hydraulic pressure in the first pipeline 51 gradually increases, and then the load of the electro-hydraulic pump increases accordingly to form Figure 3 the simulated load curve shown by the dashed line in the figure, and the load range A1 of the standard electro-hydraulic pump is within the range of the simulated load curve.

[0057] For any load point on the solid load curve in the present invention, the same load can be found on the simulated load curve. For example, the load of the electro-hydraulic pump can linearly change from 0 to the maximum value M, and the load range of the electro-hydraulic pump under all working conditions is within the interval [0, M]. By setting the first electro-controlled proportional relief valve, the electro-hydraulic pump is enabled to operate under the simulated load. In this way, by detecting the system parameters corresponding to the dashed load, it is equivalent to detecting the system parameters corresponding to each load on the solid load curve.

[0058] That is, regardless of how the load of the electro-hydraulic pump to be detected actually changes, in the present invention, the opening degree of the first electro-controlled proportional relief valve is adjusted so that the load range in the first pipeline 51 can include the load range of the standard electro-hydraulic pump.

[0059] The function of the first electro-controlled proportional relief valve set in the present invention is to adjust the load of the electro-hydraulic pump. Through the first pressure sensor and the first flow sensor, the first hydraulic data and the first flow data in the first pipeline 51 under different loads are collected. The controller can determine whether the hydraulic pressure of the electro-hydraulic pump under the current load is qualified according to the first hydraulic data and the standard hydraulic data. Similarly, the controller can determine whether the flow of the electro-hydraulic pump under the current load is qualified according to the standard flow data and the first flow data.

[0060] The present invention can not only detect the system parameters of the electro-hydraulic pump under all working conditions (from no-load to overload), improve the accuracy of the electro-hydraulic pump judgment, but also efficiently detect the system parameters under the non-linear change of the load of the electro-hydraulic pump. It ingeniously solves the problems of low detection efficiency caused by large detection amount of the electro-hydraulic pump under non-linear load conditions and low accuracy of qualified judgment.

[0061] Embodiment 2

[0062] Based on Embodiment 1, the detection device of the electro-hydraulic pump in this embodiment further includes a second electro-controlled proportional relief valve, a second pressure sensor and a second flow sensor.

[0063] The second electro-controlled proportional relief valve 40 has a third valve port and a fourth valve port. The third valve port is communicated with the second oil port of the hydraulic pump body through a third pipeline 53, and one end of a fourth pipeline 54 is connected to the fourth valve port; the other end of the fourth pipeline 54 extends below the oil level in the fuel tank.

[0064] The second pressure sensor 41 is connected to the third pipeline 53, and the second pressure sensor can collect the second pressure data in the third pipeline 53.

[0065] The second flow sensor 42 is connected to the third pipeline 53, and the second flow sensor can collect the second flow data in the third pipeline.

[0066] The controller is respectively connected to the data output ends of the second pressure sensor and the second flow sensor, and the controller can detect the electro-hydraulic pump according to the standard hydraulic data, standard flow data, second hydraulic data and second flow data.

[0067] Specifically, the detection method based on the electro-hydraulic pump detection device in this embodiment is described below. After S107, it further includes S108 to S112.

[0068] S108: With the opening degree of the first electro-controlled proportional relief valve being zero, turn off the motor. The controller zeros the second flow sensor and the second pressure sensor, and controls the first electro-controlled proportional relief valve and the second electro-controlled proportional relief valve to be fully open.

[0069] S109: Start the motor to drive the electro-hydraulic pump body to reverse; the controller sends an opening degree reduction instruction to the second electro-controlled proportional relief valve, and the opening degree of the second electro-controlled proportional relief valve gradually decreases from the maximum, so that the load of the electro-hydraulic pump under the reverse working condition gradually increases.

[0070] S110: The controller receives the second hydraulic data of the second pressure sensor and the second flow data of the second flow sensor.

[0071] S111: The controller calculates the hydraulic difference between the second hydraulic data and the standard hydraulic data at the same time point, obtains the hydraulic difference at each time point under the reverse operation condition of the electro-hydraulic pump, and the controller determines whether the hydraulic difference at each time point under the reverse operation condition is within the set pressure tolerance band. If so, step S112 is executed; if not, the pressure of the electro-hydraulic pump under the reverse operation condition is unqualified.

[0072] S112: The controller calculates the flow difference between the second flow data and the standard flow data at the same time point; the controller determines whether the flow difference is within the set flow tolerance band. If so, the electro-hydraulic pump is qualified; if not, the flow of the electro-hydraulic pump under the reverse operation condition is unqualified.

[0073] In this embodiment, when the opening of the first electro-controlled proportional relief valve is zero, the controller directly controls the motor to shut down. At this time, the detection of the electro-hydraulic pump under the forward operation condition is completed. Since the electro-hydraulic pump has a reverse operation situation, it is necessary to detect the reverse operation condition of the electro-hydraulic pump.

[0074] In this embodiment, the controller controls the first electro-controlled proportional relief valve to open, and then zeros the second flow sensor and the second pressure sensor, and then controls the first electro-controlled proportional relief valve and the second electro-controlled proportional relief valve to be fully open to prevent the existence of flow data during the forward operation condition detection, which affects the test accuracy of the reverse operation condition.

[0075] The controller controls the motor to start to drive the electro-hydraulic pump body to reverse; the controller sends an opening reduction instruction to the second electro-controlled proportional relief valve, and the opening of the second electro-controlled proportional relief valve gradually decreases from the maximum, so that the load of the electro-hydraulic pump under the reverse operation condition gradually increases.

[0076] This embodiment can not only realize the test of the forward operation condition and the reverse operation condition of the electro-hydraulic pump, but also the two operation conditions can be automatically switched and continuously detected, greatly improving the detection efficiency of the electro-hydraulic pump.

[0077] The opening and closing time of the electro-controlled proportional relief valve is adjustable from 5 to 30S, and the process flow control is linear. The measuring ranges of the first pressure sensor 31 and the second pressure sensor 41 are 0 - 30 Mpa, and the accuracy is 0.5%. The measuring ranges of the first flow sensor 32 and the second pressure sensor 42 are 0 - 10 Ml / S, and the accuracy is 0.5%. If the accuracy of the flow sensor is limited, a sampling method of taking the average value every 2 - 4S can be adopted.

[0078] The fuel tank 20 can adopt a semi-closed method to prevent the internal hydraulic oil from absorbing water and causing deterioration of the oil quality. The first, second, third, and fourth pipelines can adopt stainless steel pipes with an inner diameter of 5 - 10 mm. The pipelines and the electro-hydraulic pump adopt standard quick-connect interfaces, and the pressure resistance shall not be lower than 35 Mpa. When the interface is disconnected, a check valve is used to close automatically.

[0079] Embodiment III

[0080] Based on Embodiment I or Embodiment II, in this embodiment, the detection device of the electro-hydraulic pump further includes a temperature sensor.

[0081] The temperature sensor has a temperature acquisition end and a temperature data output end. The temperature acquisition end is in contact with or adjacent to the motor of the electro-hydraulic pump. The temperature data output end is connected to the controller. The temperature acquisition end can input the acquired motor temperature data into the controller. The controller can send a start command or a stop command to the motor according to the input temperature data and a preset temperature threshold.

[0082] Specifically, the detection method based on the detection device of the electro-hydraulic pump in this embodiment is described below. As Figure 6 shown, the detection method further includes steps S201 to S206.

[0083] S201: The controller receives a preset temperature threshold; the temperature threshold includes a pause temperature value and a recovery temperature value, and the pause temperature value is greater than the recovery temperature value.

[0084] The pause temperature value can be 80°C to 90°C, and the recovery temperature value can be set to 45°C to 55°C. Preferably, the pause temperature value is 85°C and the recovery temperature value is 50°C.

[0085] S202: The controller receives the current temperature value input by the temperature sensor in real time.

[0086] S203: When the current test of the electro-hydraulic pump is completed, the controller determines whether the current temperature value exceeds the pause temperature value. If so, execute S204; if not, conduct the next test on the electro-hydraulic pump; the controller sends an opening command to the motor to start the motor.

[0087] S204: The controller sends a stop command to the motor to stop the motor, and the electro-hydraulic pump stops running, and execute step S205.

[0088] S205: The controller determines whether the current temperature value is lower than the recovery temperature value; if so, execute step S207; if not, execute step S206.

[0089] S206: The controller receives the current temperature value input by the temperature sensor and executes step S205.

[0090] S207: The controller sends an opening instruction to the motor to start the motor and conduct the next test on the electro-hydraulic pump.

[0091] During the durability test of the electro-hydraulic pump, that is, the electro-hydraulic pump is tested many times. One test refers to one forward rotation condition and one reverse rotation condition of the electro-hydraulic pump respectively.

[0092] In this embodiment, by setting a pause temperature value and a recovery temperature value, the controller receives the motor temperature collected by the temperature sensor in real time. When the current test of the electro-hydraulic pump is completed, if the controller determines that the current temperature value is lower than the pause temperature value, the next test is conducted on the electro-hydraulic pump, improving the efficiency of the durability test of the electro-hydraulic pump.

[0093] It should be emphasized that when the current test of the electro-hydraulic pump is completed, the controller determines whether the current temperature value exceeds the pause temperature value. This avoids the motor stopping running directly when the temperature exceeds the pause temperature value and ensures that the system parameters of the electro-hydraulic pump in the current test can be saved.

[0094] When the controller determines that the current temperature value exceeds the pause temperature value, the motor operation is stopped. When the controller determines that the motor temperature is lower than the recovery temperature value, an opening instruction is sent to the motor to start the motor and conduct the next test on the electro-hydraulic pump. This avoids the motor running at high temperature for a long time, prevents deviation from the actual use condition during the durability test, and ensures that the system parameters obtained from the detection of the electro-hydraulic pump are more valuable for reference.

[0095] Embodiment 4

[0096] Based on Embodiment 1 or Embodiment 2, the detection of the electro-hydraulic pump in this embodiment further includes the current of the motor and the noise of the electro-hydraulic pump. The detection environment of the electro-hydraulic pump needs to be soundproof.

[0097] The detection device of the electro-hydraulic pump in this embodiment further includes a noise meter. The noise meter has a decibel acquisition end and a decibel output end. The decibel acquisition end is arranged beside the electro-hydraulic pump, and the decibel output end is connected to the controller. The noise meter can input the detected decibel data into the controller. The controller can detect the electro-hydraulic pump according to the set standard decibel data and the measured decibel data.

[0098] Specifically, the detection method based on the detection device of the electro-hydraulic pump in this embodiment is described below. The standard system parameters further include standard decibel data and standard current data; Figure 7aSchematic diagram of the standard current data after calibration changing with time Figure 7b Schematic diagram of the standard decibel data after calibration changing with time Figure 7c For Figure 4a 、 Figure 4b 、 Figure 7a and Figure 7b The coordinate graph after fitting four small coordinate graphs

[0099] The electric hydraulic pump detection method further includes: setting a current threshold corresponding to the standard current data, and the controller receives the set current threshold

[0100] The controller records the current data of the motor, the controller calculates the current difference between the current data and the standard current data at the same time point within the time interval, and determines whether the current difference exceeds the current threshold; if so, the current data of the electric hydraulic pump is qualified, if not, the electric hydraulic pump is unqualified

[0101] The electric hydraulic pump detection method further includes: setting a decibel threshold corresponding to the standard decibel data, and the controller receives the set decibel threshold

[0102] The controller receives the decibel data collected by the noise meter, the controller calculates the decibel difference between the decibel data and the standard decibel data at the same time point within the time interval, and determines whether the decibel difference exceeds the decibel threshold; if so, the noise of the electric hydraulic pump is qualified, if not, the noise of the electric hydraulic pump is unqualified

[0103] In this embodiment, by detecting the current and noise of the electric hydraulic pump, the electric hydraulic pump can complete the compliance detection at one time, without separately detecting the current and noise items, further improving the detection efficiency of the electric hydraulic pump

[0104] Embodiment Five

[0105] This embodiment is an electric hydraulic pump detection method, including steps S301 to S307

[0106] S301: Calibrate the standard electric hydraulic pump to obtain standard system parameters; the standard system parameters include standard hydraulic data and standard flow data

[0107] S3020: According to the time interval corresponding to the working state of the standard electric hydraulic pump, the controller receives the set time interval

[0108] According to the time when the electric hydraulic pump is in the working state, the time interval can be set to one, two or more

[0109] S302: Set the pressure tolerance band and the flow tolerance band corresponding to the standard hydraulic data and the standard flow data respectively, and the controller receives the set pressure tolerance band and the flow tolerance band.

[0110] For example, the time interval can be set to [10, 20]. Figure 8a It is the coordinate graph of the pressure changing with time after setting the time interval. Figure 8b It is the coordinate graph of the flow changing with time after setting the time interval. Figure 8c It is the coordinate graph of the current changing with time after setting the time interval. Figure 8d It is the coordinate graph of the noise changing with time after setting the time interval.

[0111] S303: Zero the first flow sensor and the first pressure sensor, and set the first electro-hydraulic proportional overflow valve to fully open.

[0112] S304: Start the motor to drive the electric hydraulic pump body to rotate forward; the controller sends an opening reduction instruction to the first electro-hydraulic proportional overflow valve, and the opening of the first electro-hydraulic proportional overflow valve gradually decreases from the maximum, so that the load of the electric hydraulic pump under the forward rotation condition gradually increases.

[0113] S305: The controller receives the first pressure data of the first pressure sensor and the first flow data of the first flow sensor. The controller calculates the hydraulic difference between the first pressure data and the standard hydraulic data at the same time point within the time interval, and obtains the hydraulic difference of the electric hydraulic pump at each time point within the time interval.

[0114] S306: The controller determines whether the hydraulic difference at each time point under the forward rotation condition is within the set pressure tolerance band. If so, execute step S307; if not, the pressure of the electric hydraulic pump under the forward rotation condition is unqualified.

[0115] S307: The controller calculates the flow difference between the first flow data and the standard flow data at the same time point within the time interval. The controller determines whether the flow difference is within the set flow tolerance band. If so, the electric hydraulic pump is qualified under the forward rotation condition; if not, the flow of the electric hydraulic pump under the forward rotation condition is unqualified.

[0116] The difference between this embodiment and the first embodiment is that, according to the time interval corresponding to the standard electric hydraulic pump being in the working state, that is, the time interval corresponding to the load when the electric hydraulic pump is actually in the working state, this embodiment sets the time interval additionally, so that the controller calculates the hydraulic difference between the first pressure data and the standard hydraulic data at the same time point within the time interval, and calculates the flow difference between the first flow data and the standard flow data at the same time point within the time interval.

[0117] Based on the system parameters of the electric hydraulic pump detected within the time interval, it not only improves the detection accuracy of the electric hydraulic pump, ensures the accurate judgment of the qualified electric hydraulic pump, but also reduces the data processing amount of the controller for the measured data.

Claims

1. An electric hydraulic pump detection method, characterized in that, The electric hydraulic pump includes a motor and a hydraulic pump body, and the hydraulic pump body has a first oil port and a second oil port; the detection device for implementing the method includes: A first electro-hydraulic proportional overflow valve, which has a first valve port and a second valve port. The first valve port is communicated with the first oil port through a first pipeline, and the second valve port is connected to one end of the first pipeline; the other end of the first pipeline extends below the liquid level of the oil in the fuel tank. A first pressure sensor, which is connected to the first pipeline, and the first pressure sensor can collect the first hydraulic data in the first pipeline. A first flow sensor, which is connected to the first pipeline, and the first flow sensor can collect the first flow data in the first pipeline. A controller, which is respectively connected to the data output ends of the first pressure sensor and the first flow sensor. The detection method for the electric hydraulic pump includes: S101: Calibrate a standard electric hydraulic pump to obtain standard system parameters; the standard system parameters include standard hydraulic data and standard flow data. S102: Set the pressure tolerance band and the flow tolerance band corresponding to the standard hydraulic data and the standard flow data respectively, and the controller receives the set pressure tolerance band and the flow tolerance band. S103: Zero the first flow sensor and the first pressure sensor, and set the first electro-hydraulic proportional overflow valve to be fully open. S104: Start the motor to drive the hydraulic pump body to rotate forward; the controller sends an opening reduction instruction to the first electro-hydraulic proportional overflow valve, and the opening of the first electro-hydraulic proportional overflow valve gradually decreases from the maximum, so that the load of the electric hydraulic pump under the forward rotation condition gradually increases. S105: The controller receives the first pressure data of the first pressure sensor and the first flow data of the first flow sensor, and the controller calculates the hydraulic difference between the first pressure data of the first pressure sensor and the standard hydraulic data at the same time point. S106: The controller judges whether the hydraulic difference at each time point under the forward rotation condition is within the set pressure tolerance band. If so, execute step S107; if not, the pressure of the electric hydraulic pump under the forward rotation condition is unqualified. S107: The controller calculates the flow difference between the first flow data and the standard flow data at the same time point; the controller judges whether the flow difference is within the set flow tolerance band. If so, the electric hydraulic pump is qualified under the forward rotation condition; if not, the flow of the electric hydraulic pump under the forward rotation condition is unqualified.

2. The electric hydraulic pump detection method according to claim 1, characterized in that, The detection device further includes: A second electro-hydraulic proportional overflow valve, which has a third valve port and a fourth valve port. The third valve port is communicated with the second oil port through a third pipeline, and the fourth valve port is connected to one end of the third pipeline; the other end of the third pipeline extends below the liquid level of the oil in the fuel tank. A second pressure sensor, which is connected to the third pipeline, and the second pressure sensor can collect the second pressure data in the third pipeline. A second flow sensor, which is connected to the third pipeline, and the second flow sensor can collect the second flow data in the third pipeline. The controller is respectively connected to the data output ends of the second pressure sensor and the second flow sensor; After the step S107, the method further includes: S108: When the opening degree of the first electro-hydraulic proportional overflow valve is zero, turn off the motor. The controller zeros the second flow sensor and the second pressure sensor, and controls the first electro-hydraulic proportional overflow valve and the second electro-hydraulic proportional overflow valve to be fully opened; S109: Start the motor to drive the electric hydraulic pump body to reverse; the controller sends an opening degree decreasing instruction to the second electro-hydraulic proportional overflow valve, and the opening degree of the second electro-hydraulic proportional overflow valve gradually decreases from the maximum, so that the load of the electric hydraulic pump under the reverse working condition gradually increases; S110: The controller receives the second hydraulic data of the second pressure sensor and the second flow data of the second flow sensor; S111: The controller calculates the hydraulic difference between the second hydraulic data and the standard hydraulic data at the same time point, obtains the hydraulic difference at each time point under the reverse working condition of the electric hydraulic pump, and the controller judges whether the hydraulic difference at each time point under the reverse working condition is within the set pressure tolerance band. If so, execute step S112; if not, the pressure of the electric hydraulic pump under the reverse working condition is unqualified; S112: The controller calculates the flow difference between the second flow data and the standard flow data at the same time point; the controller judges whether the flow difference is within the set flow tolerance band. If so, the electric hydraulic pump is qualified; if not, the flow of the electric hydraulic pump under the reverse working condition is unqualified.

3. The electric hydraulic pump detection method according to claim 1 or 2, characterized in that, The detection device further includes: A temperature sensor, which has a temperature acquisition end and a temperature data output end. The temperature acquisition end is in contact with or adjacent to the motor of the electric hydraulic pump, and the temperature data output end is connected to the controller; The method further includes: S201: The controller receives a preset temperature threshold; the temperature threshold includes a pause temperature value and a resume temperature value, and the pause temperature value is greater than the resume temperature value; S202: The controller receives the current temperature value input by the temperature sensor in real time; S203: When the current test of the electric hydraulic pump is completed, the controller judges whether the current temperature value exceeds the pause temperature value. If so, execute S204; if not, conduct the next test on the electric hydraulic pump; the controller sends an opening instruction to the motor to start the motor; S204: The controller sends a closing instruction to the motor to turn off the motor, and the electric hydraulic pump stops running, and execute step S205; S205: The controller judges whether the current temperature value is lower than the resume temperature value; if so, execute step S207; if not, execute step S206; S206: The controller receives the current temperature value input by the temperature sensor, and execute step S205; S207: The controller sends an opening instruction to the motor to start the motor, and conduct the next test on the electric hydraulic pump.

4. The electric hydraulic pump detection method according to claim 1 or 2, characterized in that,Before the step S102, the method further includes: S1020: According to the time interval corresponding to the working state of the standard electro-hydraulic pump, the controller receives the set time interval; The S105 includes: The controller calculates the hydraulic difference between the first pressure data and the standard hydraulic data at the same time point within the time interval, and obtains the hydraulic difference of the electro-hydraulic pump at each time point within the time interval; The S107 includes: The controller calculates the flow difference between the first flow data and the standard flow data at the same time point within the time interval.

5. The electric hydraulic pump detection method according to claim 4, characterized in that, The standard system parameters further include standard current data; The electro-hydraulic pump detection method further includes: Setting a current threshold corresponding to the standard current data, and the controller receives the set current threshold; The controller records the current data of the motor, the controller calculates the current difference between the current data and the standard current data at the same time point within the time interval, and determines whether the current difference exceeds the current threshold; if so, the current data of the electro-hydraulic pump is qualified, if not, the electro-hydraulic pump is unqualified.

6. The electric hydraulic pump detection method according to claim 3, characterized in that, The detection device further includes: A noise meter, which has a decibel acquisition end and a decibel output end, the decibel acquisition end is arranged beside the electro-hydraulic pump, and the decibel output end is connected to the controller; The standard system parameters further include standard decibel data; Setting a decibel threshold corresponding to the standard decibel data, and the controller receives the set decibel threshold; The controller receives the decibel data collected by the noise meter, the controller calculates the decibel difference between the decibel data and the standard decibel data at the same time point within the time interval, and determines whether the decibel difference exceeds the decibel threshold; if so, the noise of the electro-hydraulic pump is qualified, if not, the noise of the electro-hydraulic pump is unqualified.

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