An electro-hydraulic control proportional valve amplifier state monitoring test bench and a monitoring method thereof

Abstract

This invention belongs to the field of electro-hydraulic control technology for waterjet propulsion devices, specifically relating to a state monitoring test bench and monitoring method for an electro-hydraulic control proportional valve amplifier. It simulates and monitors parameters such as output current, response ramp speed, and output chatter frequency of the electro-hydraulic control proportional valve amplifier in a waterjet propulsion device. By comparing the actual collected current data with the excitation current, the state of the electro-hydraulic control proportional valve amplifier is determined, and early warnings are provided for faults. The invention also features real-time data acquisition, display, alarm, and parameter setting functions for the operating status of the electro-hydraulic control proportional valve amplifier in the waterjet propulsion device. This further improves the reliability of existing waterjet propulsion devices for ships and has significant application prospects and socio-economic benefits for further expanding the market and application of waterjet propulsion devices.

Description

Technical Field

[0001] This invention relates to the field of electro-hydraulic control technology for water jet propulsion devices, and in particular to a test bench for monitoring the status of an electro-hydraulic control proportional valve amplifier and its monitoring method. Background Technology

[0002] Electro-hydraulic proportional control technology has been developing for over 50 years, making it a relatively young and rapidly evolving technology, and an important branch of the field of fluid transmission and control. In modern industry, electro-hydraulic proportional systems are widely used in aerospace and military engineering applications requiring precise control due to their high performance, low cost, and strong resistance to contamination. The proportional controller, as a key component of the electro-hydraulic proportional control system, is the "brain" of the system, and its performance directly affects the control performance of the entire system.

[0003] Waterjet propulsion, as a new type of power propulsion for ships, has high propulsion efficiency and low noise performance at high speeds, and excellent maneuverability. It aligns with the development trend of high-performance surface ship propulsion technology and can meet the development needs of next-generation high-speed ships and other equipment.

[0004] As a critical piece of equipment for vessel navigation, the health of the proportional valve amplifier in the electro-hydraulic control of the waterjet propulsion system directly determines whether the vessel can navigate normally. However, due to the complex structure and variable operating conditions of the proportional valve amplifier in the electro-hydraulic control of the waterjet propulsion system, and the fact that it typically requires high load and long-term operation, coupled with a relatively backward maintenance system, malfunctions of the proportional valve amplifier in the waterjet propulsion system occur frequently, affecting the normal navigation of the vessel. Moreover, the crew's experience and skill level limit their ability to make accurate malfunction predictions, let alone effectively troubleshoot the problems. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problems existing in the background art. To this end, an electro-hydraulic control proportional valve amplifier state monitoring test bench and its monitoring method are provided.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A method for monitoring the status of an electro-hydraulic controlled proportional valve amplifier includes the following steps:

[0008] Step S1: Install the monitoring test stand in the position corresponding to the water jet propulsion device;

[0009] Step S2: Open the cover of the monitoring test bench and connect the monitoring test bench to the proportional valve amplifier.

[0010] Step S3: Plug the power socket of the monitoring test bench into the power supply and turn on the power;

[0011] Step S4: after the end of the boot, display system interface;

[0012] Step S5: the proportional valve amplifier CAN communication instruction interface monitoring, judge whether to pass the test;

[0013] Step S6: the proportional valve amplifier 0~5V interface monitoring, judge whether to pass the test;

[0014] Step S7: the proportional valve amplifier 4~20mA interface monitoring, judge whether to pass the test;

[0015] Step S8: the proportional valve amplifier gain adjustment monitoring, judge whether to pass the test;

[0016] Step S9: the proportional valve amplifier bias adjustment monitoring, judge whether to pass the test;

[0017] Step S10: the proportional valve amplifier threshold adjustment monitoring, judge whether to pass the test;

[0018] Step S11: the proportional valve amplifier slope time monitoring, judge whether to pass the test;

[0019] Step S12: the proportional valve amplifier tremor frequency monitoring, judge whether to pass the test;

[0020] Step S13: after the completion of the monitoring work, turn off the power switch of the monitoring test bench, remove the test cable, close the box cover of the monitoring test bench, remove the monitoring test bench from the corresponding position of the water jet propulsion device.

[0021] The following is the further defined technical solution of the application, in the CAN communication instruction interface monitoring, including: in the operation interface of the display screen, select the CAN communication signal source from the diagnosis area drop-down box; change the percentage of the control quantity, adjust to 0% and 100% respectively, observe S1 state and S2 state; if S1 state and S2 state are normal, and the current value is positive and negative gain value, the test is passed; if any one of S1 state and S2 state is fault, or the current value is not positive and negative gain value, the test is not passed.

[0022] The following is the further defined technical solution of the application, in the 0~5V interface monitoring, including: in the operation interface of the display screen, select the 0~5V signal source from the diagnosis area drop-down box, change the percentage of the control quantity, adjust to 0% and 100% respectively, observe S1 state and S2 state; if S1 state and S2 state are normal, and the current value is positive and negative gain value, the test is passed; if any one of S1 state and S2 state is fault, or the current value is not positive and negative gain value, the test is not passed.

[0023] The following is a further limited technical solution of the application, in the 4-20mA interface monitoring, comprising: in the operation interface of the display screen, selecting 4-20mA signal source from the diagnostic area pull-down box, changing the percentage of control quantity, adjusting to 0% and 100% respectively, observing S1 state and S2 state; if S1 state and S2 state are both normal, and the current value is positive and negative gain value, then the test is passed; if anyone of S1 state and S2 state is fault, or the current value is not positive and negative gain value, then the test is failed.

[0024] The following is a further limited technical solution of the application, in the gain adjustment monitoring, comprising: in the operation interface of the display screen, modifying positive and negative gain from the adjustment interface, selecting control signal source as internal signal, changing the percentage of control quantity, adjusting to 0% and 100% respectively, observing S1 state and S2 state; if S1 state and S2 state are both normal, and the current value is modified positive and negative gain value, then the test is passed; if anyone of S1 state and S2 state is fault, or the current value is not positive and negative gain value, then the test is failed.

[0025] The following is a further limited technical solution of the application, in the bias adjustment monitoring, comprising: in the operation interface of the display screen, modifying positive and negative bias value from the adjustment interface, selecting control signal source as internal signal, changing the percentage of control quantity, adjusting to positive and negative bias value, observing S1 state and S2 state; if S1 state and S2 state are both normal, and the initial value of current value is bias value, then the test is passed; if anyone of S1 state and S2 state is fault, or the initial value of current value is not bias value, then the test is failed.

[0026] The following is a further limited technical solution of the application, in the threshold value adjustment monitoring, comprising: in the operation interface of the display screen, modifying threshold value from the adjustment interface, selecting control signal source as internal signal, changing the percentage of control quantity, adjusting to threshold value range, observing S1 state and S2 state; if S1 state and S2 state are both normal, and the current value is 0A, then the test is passed; if anyone of S1 state and S2 state is fault, or the current value is not 0A, then the test is failed.

[0027] After the test in the threshold value range is passed, adjusting to outside the threshold value range, changing the percentage of control quantity, adjusting to 0% and 100% respectively, observing S1 state and S2 state; if S1 state and S2 state are both normal, and the current value is positive and negative gain value, then the test is passed; if anyone of S1 state and S2 state is fault, or the current value is not positive and negative gain value, then the test is failed.

[0028] The following is a further limited technical solution of the application, in the slope time monitoring, including: on the operation interface of the display screen, modifying the slope response time from the slope interface, selecting the control signal source as an internal signal, changing the percentage of the control quantity, adjusting to 0% and 100% respectively, observing S1 state and S2 state; if S1 state and S2 state are normal, and the current value is positive and negative gain value, the test is passed; if any one of S1 state and S2 state is faulty, or the current value is not positive and negative gain value, the test is failed.

[0029] The following is a further limited technical solution of the application, in the tremor frequency monitoring, including: on the operation interface of the display screen, modifying the tremor frequency from the tremor signal interface, selecting the control signal source as an internal signal, changing the percentage of the control quantity, adjusting to 0% and 100% respectively, observing S1 state and S2 state; if S1 state and S2 state are normal, and the current value is positive and negative gain value, the test is passed; if any one of S1 state and S2 state is faulty, or the current value is not positive and negative gain value, the test is failed.

[0030] An electro-hydraulic control proportional valve amplifier state monitoring test bench for realizing the above-mentioned monitoring method, comprising a box cover, a box body, a display screen, a voltage and current meter, a DC 24V power switch, an enable button, a DC 24V power supply terminal, an analog electromagnetic valve output terminal, a 0-5V output terminal, a 4-20mA output terminal, a CAN communication terminal, a USB to CAN communication module, a 4-way voltage and current collector, an AC 220V to DC 24V switching power supply, an 8-way analog quantity output module, and an analog load resistor.

[0031] The box cover is connected with the box body to realize the sealing function of the monitoring test bench.

[0032] The display screen is used for monitoring the test bench monitoring interface display and data processing.

[0033] The voltage and current meter is used for displaying the working current and voltage value of the monitoring test bench.

[0034] The DC 24V power switch is used for power control of the monitoring test bench.

[0035] The enable button is used for enabling the proportional valve amplifier to work.

[0036] The DC 24V power supply terminal is used for power supply of the proportional valve amplifier.

[0037] The analog electromagnetic valve output terminal is used for simulating the proportional valve.

[0038] The 0-5V output terminal outputs a 0-5V voltage signal and is used for proportional valve amplifier input signal test.

[0039] 4-20mA output terminal, output 4-20mA current signal, used for proportional valve amplifier input signal test;

[0040] CAN communication terminal, used for proportional valve amplifier input signal test;

[0041] USB to CAN communication module, used for monitoring test bench to convert CAN communication into USB communication and display screen to interact with data;

[0042] 4-way voltage and current collector, used for voltage signal and current signal collection;

[0043] AC220V to DC24V switching power supply, used for converting AC220V into DC24V for monitoring test bench;

[0044] 8-way analog output module, used for 0-5V signal and 4-20mA signal generation;

[0045] Analog load resistor, used for driving analog load of electromagnetic valve.

[0046] Compared with the prior art, the present application has the following technical effects:

[0047] The present application simulates and monitors the output current, response slope speed, output tremor frequency and other parameters of the electro-hydraulic control proportional valve amplifier of the water jet propulsion device, compares the actual collected current data with the excitation current, completes the state judgment of the electro-hydraulic control proportional valve amplifier, and gives early warning for faults; real-time collection of the running state of the electro-hydraulic control proportional valve amplifier of the water jet propulsion device, collection, display, alarm and parameter setting of related data, further improves the reliability of the original water jet propulsion device ship, and further expands the market promotion and application of the water jet propulsion device, and has very important application prospect and social and economic benefits.

[0048] The present application will be further described below in conjunction with the drawings and examples. DETAILED DESCRIPTION

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0050] Figure 1 is the structural arrangement diagram on the monitoring test bench surface after the box cover of the monitoring test bench in the present application is opened;

[0051] Figure 2 is the structural schematic diagram of the monitoring test bench in the present application.

[0052] Figure 3 is the structural layout of the box inside the monitoring test bench in the application;

[0053] Figure 4 is the state monitoring operation interface in the monitoring process of the application;

[0054] Figure 5 is the diagnosis area interface of the state monitoring operation interface in the application;

[0055] Figure 6 is the gain, bias and threshold monitoring interface of the state monitoring operation interface in the application;

[0056] Figure 7 is the slope time monitoring interface of the state monitoring operation interface in the application;

[0057] Figure 8 is the tremor frequency monitoring interface of the state monitoring operation interface in the application. DETAILED DESCRIPTION

[0058] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the specific embodiments of the application will be described in detail below in combination with the drawings. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the application. However, the application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the application, so the application is not limited by the specific embodiments disclosed below.

[0059] As shown in Figures 1-8 , a water jet propulsion device electro-hydraulic control proportional valve amplifier state monitoring test bench is provided, which is mainly used for simulating excitation and monitoring and early warning of output current, response slope speed, output tremor frequency and other parameters of the water jet propulsion device electro-hydraulic control proportional valve amplifier.

[0060] As shown in Figure 1 , 2 , 3, the monitoring test bench comprises a box cover 1, a box body 2, a display screen 3, a voltage and current meter 4, a DC 24V power supply switch 5, an enable button 6, a DC 24V power supply terminal 7, an analog solenoid valve output terminal 8, a 0-5V output terminal 9, a 4-20mA output terminal 10, a CAN communication terminal 11, a USB to CAN communication module 12, a 4-channel voltage and current collector 13, an AC 220V to DC 24V switching power supply 14, an 8-channel analog output module 15, and an analog load resistor 16.

[0061] The box cover 1 is connected with the box body 2 to realize the sealing function of the monitoring test bench; the display screen 3 is used for monitoring the test bench monitoring interface display and data processing; the voltage and current meter 4 is used for displaying the working current and voltage value of the monitoring test bench; the DC 24V power switch 5 is used for the power control of the monitoring test bench; the enable button 6 is used for the proportional valve amplifier working enablement; the DC 24V power supply terminal 7 is used for the proportional valve amplifier working power supply; the analog electromagnetic valve output terminal 8 is used for the analog proportional valve physical object; the 0-5V output terminal 9 outputs 0-5V voltage signals and is used for the proportional valve amplifier input signal test; the 4-20mA output terminal 10 outputs 4-20mA current signals and is used for the proportional valve amplifier input signal test; the CAN communication terminal 11 is used for the proportional valve amplifier input signal test; the USB to CAN communication module 12 is used for converting the CAN communication of the monitoring test bench into USB communication and interacting with the display screen; the 4-way voltage and current collector is used for voltage signal and current signal collection; the AC 220V to DC 24V switching power supply 14 is used for converting AC 220V into DC 24V for the monitoring test bench; the 8-way analog quantity output module is used for 0-5V signal and 4-20mA signal generation; and the analog load resistor 16 is used for the driving analog load of the electromagnetic valve.

[0062] An electro-hydraulic control proportional valve amplifier state monitoring method, steps are as follows:

[0063] (1) Install the monitoring test bench to the position corresponding to the water jet propulsion device;

[0064] (2) Open the box cover of the monitoring test bench, and connect the monitoring test bench with the proportional valve amplifier in line;

[0065] (3) Insert the power socket of the monitoring test bench into the power supply, and turn on the power supply;

[0066] (4) After the start is completed, the system interface is displayed, as shown in Figure 4 ;

[0067] (5) CAN communication instruction interface monitoring: as shown in Figure 5 , select the CAN communication signal source from the diagnosis area in the operation interface of the display screen. Change the percentage of the control quantity, and adjust to 0% and 100% respectively, and observe the S1 state (proportional valve power-on state) and the S2 state (proportional valve power-off state). As shown in Figure 5 , if the fault column displays “normal” and the current value is the positive and negative gain value, the test is passed. If the fault column displays “fault” and the current value is not the positive and negative gain value, the test is failed.

[0068] (6) 0-5V interface monitoring: as shown in Figure 5As shown in the display screen interface, select 0-5V signal source from the drop-down box in the diagnosis area. Change the percentage of the control variable to 0% and 100% respectively, and observe the S1 state (proportional valve powered state) and S2 state (proportional valve unpowered state). If the fault column displays "normal" and the current value is the positive and negative gain value, the test is passed. If the fault column displays "fault" and the current value is not the positive and negative gain value, the test is failed.

[0069] (7) 4-20mA interface monitoring: as shown in Figure 5 the display screen interface, select 4-20mA signal source from the drop-down box in the diagnosis area. Change the percentage of the control variable to 0% and 100% respectively, and observe the S1 state (proportional valve powered state) and S2 state (proportional valve unpowered state). If the fault column displays "normal" and the current value is the positive and negative gain value, the test is passed. If the fault column displays "fault" and the current value is not the positive and negative gain value, the test is failed.

[0070] (8) Gain adjustment monitoring: as shown in Figure 6 the display screen interface, modify the positive and negative gain from the adjustment interface. Select the control signal source as internal signal, change the percentage of the control variable to 0% and 100% respectively, and observe the S1 state (proportional valve powered state) and S2 state (proportional valve unpowered state). If the fault column displays "normal" and the current value is the modified positive and negative gain value, the test is passed. If the fault column displays "fault" and the current value is not the positive and negative gain value, the test is failed.

[0071] (9) Bias adjustment monitoring: as shown in Figure 6 the display screen interface, modify the positive and negative bias value from the adjustment interface. Select the control signal source as internal signal, change the percentage of the control variable to the positive and negative bias value, and observe the S1 state (proportional valve powered state) and S2 state (proportional valve unpowered state). If the fault column displays "normal" and the initial value of the current value is the bias value, the test is passed. If the fault column displays "fault" and the initial value of the current value is not the bias value, the test is failed.

[0072] (10) Threshold value adjustment monitoring: as shown in Figure 6As shown in the display screen, the threshold value is modified from the adjustment interface. The control signal source is selected as the internal signal, the percentage of the control quantity is changed, the threshold value range is adjusted, and the S1 state (the proportional valve is powered on) and the S2 state (the proportional valve is not powered on) are observed. If the fault column displays "normal" and the current value is 0A, the test is passed. If the fault column displays "fault" and the current value is not 0A, the test is failed; the threshold value range is adjusted out of range, the percentage of the control quantity is changed, and 0% and 100% are adjusted respectively, and the S1 state (the proportional valve is powered on) and the S2 state (the proportional valve is not powered on) are observed. If the fault column displays "normal" and the current value is the positive and negative gain value, the test is passed. If the fault column displays "fault" and the current value is not the positive and negative gain value, the test is failed.

[0073] (11) Slope time monitoring: as shown in Figure 7 the display screen, the slope response time is modified from the slope interface. The control signal source is selected as the internal signal, the percentage of the control quantity is changed, and 0% and 100% are adjusted respectively, and the S1 state (the proportional valve is powered on) and the S2 state (the proportional valve is not powered on) are observed. If the fault column displays "normal" and the current value is the positive and negative gain value, the test is passed. If the fault column displays "fault" and the current value is not the positive and negative gain value, the test is failed.

[0074] (12) Chattering frequency monitoring: as shown in Figure 8 the display screen, the chattering frequency is modified from the chattering signal interface. The control signal source is selected as the internal signal, the percentage of the control quantity is changed, and 0% and 100% are adjusted respectively, and the S1 state and the S2 state are observed. If the fault column displays "normal" and the current value is the positive and negative gain value, the test is passed. If the fault column displays "fault" and the current value is not the positive and negative gain value, the test is failed.

[0075] (13) After the monitoring work is completed, the power switch of the monitoring test bench is turned off, the test cable is removed, the box cover of the monitoring test bench is closed, and the monitoring test bench is removed from the corresponding position of the water jet propulsion device.

[0076] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present application, or modify it into equivalent embodiments, without departing from the scope of the technical solution of the present application, by using the disclosed methods and technical contents. Therefore, any equivalent changes made according to the shape, structure and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A method of electro-hydraulic control proportional valve amplifier condition monitoring, characterized by, The method comprises the following steps: Step S1: install the monitoring test bench to a position corresponding to the water jet propulsion device; Step S2: open the box cover of the monitoring test bench, and connect the monitoring test bench with the proportional valve amplifier in a line; Step S3: plug the power supply socket of the monitoring test bench into the power supply, and turn on the power supply; Step S4: after the booting is completed, the system interface is displayed; Step S5: perform CAN communication instruction interface monitoring on the proportional valve amplifier, and determine whether the test is passed; In the CAN communication instruction interface monitoring, the following steps are included: on the operation interface of the display screen, the CAN communication signal source is selected from the drop-down box in the diagnosis area; the percentage of the control quantity is changed, and is adjusted to 0% and 100% respectively, and the S1 state and the S2 state are observed; if the S1 state and the S2 state are both normal, and the current value is the positive and negative gain value, the test is passed; if any one of the S1 state and the S2 state is a fault, or the current value is not the positive and negative gain value, the test is not passed; Step S6: perform 0-5V interface monitoring on the proportional valve amplifier, and determine whether the test is passed; In the 0-5V interface monitoring, the following steps are included: on the operation interface of the display screen, the 0-5V signal source is selected from the drop-down box in the diagnosis area, the percentage of the control quantity is changed, and is adjusted to 0% and 100% respectively, and the S1 state and the S2 state are observed; if the S1 state and the S2 state are both normal, and the current value is the positive and negative gain value, the test is passed; if any one of the S1 state and the S2 state is a fault, or the current value is not the positive and negative gain value, the test is not passed; Step S7: perform 4-20mA interface monitoring on the proportional valve amplifier, and determine whether the test is passed; Step S8: perform gain adjustment monitoring on the proportional valve amplifier, and determine whether the test is passed; In the gain adjustment monitoring, the following steps are included: on the operation interface of the display screen, the positive and negative gain values are modified from the adjustment interface, the control signal source is selected as the internal signal, the percentage of the control quantity is changed, and is adjusted to 0% and 100% respectively, and the S1 state and the S2 state are observed; if the S1 state and the S2 state are both normal, and the current value is the modified positive and negative gain value, the test is passed; if any one of the S1 state and the S2 state is a fault, or the current value is not the positive and negative gain value, the test is not passed; Step S9: perform bias adjustment monitoring on the proportional valve amplifier, and determine whether the test is passed; In the bias adjustment monitoring, the following steps are included: on the operation interface of the display screen, the positive and negative bias values are modified from the adjustment interface, the control signal source is selected as the internal signal, the percentage of the control quantity is changed, and is adjusted to the positive and negative bias values, and the S1 state and the S2 state are observed; if the S1 state and the S2 state are both normal, and the initial value of the current value is the bias value, the test is passed; if any one of the S1 state and the S2 state is a fault, or the initial value of the current value is not the bias value, the test is not passed; Step S10: perform threshold value adjustment monitoring on the proportional valve amplifier, and determine whether the test is passed; In the threshold value adjustment monitoring, including: in the operation interface of the display screen, modify the threshold value from the adjustment interface, select the control signal source as the internal signal, change the percentage of the control quantity, adjust to the threshold value range, observe S1 state and S2 state; if S1 state and S2 state are normal, and the current value is 0A, then the test passes; if either S1 state or S2 state is faulty, or the current value is not 0A, then the test fails; After the test passes in the threshold value range, adjust to outside the threshold value range, change the percentage of the control quantity, adjust to 0% and 100% respectively, observe S1 state and S2 state; if S1 state and S2 state are normal, and the current value is positive and negative gain value, then the test passes; if either S1 state or S2 state is faulty, or the current value is not positive and negative gain value, then the test fails; Step S11: slope time monitoring is performed on the proportional valve amplifier, and it is judged whether the test passes or not; Step S12: tremor frequency monitoring is performed on the proportional valve amplifier, and it is judged whether the test passes or not; Step S13: after the monitoring work is completed, the power switch of the monitoring test bench is turned off, the test cable is removed, the box cover of the monitoring test bench is closed, and the monitoring test bench is removed from the corresponding position of the water jet propulsion device.

2. A method of electro-hydraulic control proportional valve amplifier condition monitoring as claimed in claim 1, wherein, In the 4-20mA interface monitoring, including: in the operation interface of the display screen, select the 4-20mA signal source from the pull-down box in the diagnosis area, change the percentage of the control quantity, adjust to 0% and 100% respectively, observe S1 state and S2 state; if S1 state and S2 state are normal, and the current value is positive and negative gain value, then the test passes; if either S1 state or S2 state is faulty, or the current value is not positive and negative gain value, then the test fails.

3. An electro-hydraulic control proportional valve amplifier condition monitoring method as claimed in claim 1, wherein, In the slope time monitoring, including: in the operation interface of the display screen, modify the slope response time from the slope interface, select the control signal source as the internal signal, change the percentage of the control quantity, adjust to 0% and 100% respectively, observe S1 state and S2 state; if S1 state and S2 state are normal, and the current value is positive and negative gain value, then the test passes; if either S1 state or S2 state is faulty, or the current value is not positive and negative gain value, then the test fails.

4. An electro-hydraulic control proportional valve amplifier condition monitoring method as claimed in claim 1, wherein, In the tremor frequency monitoring, including: in the operation interface of the display screen, modify the tremor frequency from the tremor signal interface, select the control signal source as the internal signal, change the percentage of the control quantity, adjust to 0% and 100% respectively, observe S1 state and S2 state; if S1 state and S2 state are normal, and the current value is positive and negative gain value, then the test passes; if either S1 state or S2 state is faulty, or the current value is not positive and negative gain value, then the test fails.

5. An electro-hydraulic control proportional valve amplifier condition monitoring test bench for implementing the monitoring method of any one of claims 1-4, characterized in that, It includes a box cover, a box body, a display screen, a voltage and current meter, a DC 24V power switch, an enable button, a DC 24V power supply terminal, an analog electromagnetic valve output terminal, a 0-5V output terminal, a 4-20mA output terminal, a CAN communication terminal, a USB to CAN communication module, a 4-way voltage and current collector, an AC 220V to DC 24V switching power supply, an 8-way analog output module, and an analog load resistor; The box cover is connected with the box body to realize the sealing function of the monitoring test bench. The display screen is used for monitoring the test bench interface display and data processing. The voltage and current meter is used for displaying the working current and voltage value of the monitoring test bench. The DC 24V power switch is used for the power control of the monitoring test bench. The enable button is used for enabling the proportional valve amplifier to work. The DC 24V power supply terminal is used for the power supply of the proportional valve amplifier. The analog electromagnetic valve output terminal is used for the analog proportional valve. The 0-5V output terminal is used for outputting 0-5V voltage signal and testing the input signal of the proportional valve amplifier. The 4-20mA output terminal is used for outputting 4-20mA current signal and testing the input signal of the proportional valve amplifier. The CAN communication terminal is used for testing the input signal of the proportional valve amplifier. The USB to CAN communication module is used for converting the CAN communication into USB communication and realizing the data interaction between the monitoring test bench and the display screen. The 4-way voltage and current collector is used for collecting the voltage signal and current signal. The AC 220V to DC 24V switching power supply is used for converting AC 220V into DC 24V for the monitoring test bench. The 8-way analog quantity output module is used for generating 0-5V signal and 4-20mA signal. The analog load resistor is used for driving the analog load of the electromagnetic valve.

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