An automatic calibration system and method for a hydraulic proportional valve data acquisition card

Abstract

The application discloses a kind of hydraulic proportional valve data acquisition card automatic calibration system and method thereof, wherein system includes host computer data acquisition module, calibrated test bench, data acquisition card to be calibrated, electromagnetic valve, displacement sensor, power supply module;Host computer data acquisition module issues calibration command and parameter to data acquisition card;Data acquisition card is used to receive calibration command and parameter issued by host computer data acquisition module, after signal excitation is carried out to electromagnetic valve or displacement sensor, corresponding data original code is collected;Test bench collects corresponding physical quantity data;Data acquisition card will data original code, physical quantity data form sample, send to host computer data acquisition module according to calibration algorithm to complete calibration;Power supply module is used to provide power support for electromagnetic valve, displacement sensor, data acquisition card, test bench;The application carries out automatic adjustment to sensor in hydraulic proportional valve, improves the calibration efficiency of sensor in hydraulic proportional valve.

Description

Technical Field

[0001] This invention relates to the field of industrial testing, and in particular to an automatic calibration system and method for a hydraulic proportional valve data acquisition card. Background Technology

[0002] Hydraulic proportional valves are crucial components for controlling flow and pressure in hydraulic systems, enabling stepless adjustment from low to high speeds and from small to large flow rates. Compared to conventional hydraulic valves, hydraulic proportional valves offer higher control precision and stability, and are widely used in the hydraulic systems of various engineering machinery.

[0003] A hydraulic proportional valve controls the flow and pressure of a hydraulic system by controlling an electromagnet to generate electromagnetic force. Under the action of electromagnetic force and spring force, the valve core moves. Fluid enters the hydraulic proportional valve from the hydraulic pump through the valve, and after being controlled by the valve core, flows to the system's actuators, such as hydraulic cylinders or hydraulic motors.

[0004] Hydraulic proportional valves typically consist of multiple components, including an electromagnet, a valve spool position feedback sensor, and a data acquisition card. The data acquisition card needs to collect not only the current from the electromagnet but also the feedback signal from the valve spool displacement sensor to accurately control the valve spool position. However, the calibration coefficients of these sensor acquisition circuits usually require manual adjustment by multiple people, a time-consuming and labor-intensive process. Therefore, a rapid and automatic calibration of these sensor acquisition circuit coefficients can not only save labor costs but also improve debugging efficiency during the research and development phase. Summary of the Invention

[0005] To overcome the problem of low efficiency in manual calibration and adjustment of hydraulic proportional valves in the prior art, this invention discloses an automatic calibration system and method for hydraulic proportional valve data acquisition cards, which automatically calibrates hydraulic proportional valves and improves the calibration efficiency of sensors in hydraulic proportional valves.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] The present invention discloses an automatic calibration system for a hydraulic proportional valve data acquisition card, including a host computer data acquisition module, a calibrated test bench, a data acquisition card to be calibrated, a solenoid valve, a displacement sensor, and a power supply module.

[0008] The host computer data acquisition module is electrically connected to the calibrated test bench and the data acquisition card to be calibrated.

[0009] The solenoid valves are electrically connected to the calibrated test bench and the data acquisition card to be calibrated.

[0010] The displacement sensor is electrically connected to the test bench and the data acquisition card, respectively.

[0011] The host computer data acquisition module is used to send calibration commands and parameters to the data acquisition card to be calibrated.

[0012] The calibrated test bench is electrically connected to the data acquisition card to be calibrated.

[0013] The data acquisition card to be calibrated is used to receive calibration commands and parameters issued by the host computer data acquisition module, and then to excite the solenoid valve or displacement sensor by signal and collect the corresponding digital original code.

[0014] The calibrated test bench collects corresponding physical quantity data after being excited by a solenoid valve or displacement sensor.

[0015] The data acquisition card to be calibrated sends a sample composed of digital original code and physical data to the host computer data acquisition module, which then completes the calibration according to the calibration algorithm.

[0016] The power supply module is used to provide power to the solenoid valve, displacement sensor, data acquisition card to be calibrated, and calibrated test bench.

[0017] Preferably, when the solenoid valve is excited by a signal, the current signal of the solenoid valve is collected;

[0018] When the displacement sensor is excited by a signal, the displacement signal of the hydraulic proportional valve spool of the displacement sensor is collected.

[0019] Furthermore, when the solenoid valve is excited by a signal.

[0020] The data acquisition card to be calibrated includes a control board circuit, a driver board circuit, and a data acquisition circuit.

[0021] The output terminal of the control board circuit is electrically connected to the input terminal of the drive board circuit; the output terminal of the drive board circuit is electrically connected to the input terminal of the solenoid valve; and the output terminal of the data acquisition circuit is electrically connected to the input terminal of the control board circuit.

[0022] The solenoid valve serves as the load for the drive circuit.

[0023] The control board circuit is used to output a PWM signal to the driver board circuit, which in turn adjusts the current in the solenoid valve.

[0024] The data acquisition circuit is used to acquire the current signal of the solenoid valve, convert it into the original code of the current, and send it to the control board circuit.

[0025] The calibrated test bench is used to collect the current signal of the solenoid valve, convert it into a current physical quantity, and send it to the data acquisition card to be calibrated.

[0026] The data acquisition card to be calibrated coordinates and collects the physical quantities of current and the original code of current collected by the calibrated test bench to obtain the calibration table of current calibration.

[0027] Furthermore, when the displacement sensor is excited by a signal.

[0028] The data acquisition card to be calibrated includes a control circuit, a drive circuit, and a data acquisition circuit.

[0029] The output terminal of the control circuit is electrically connected to the input terminal of the drive circuit, the output terminal of the drive circuit is electrically connected to the displacement sensor, and the output terminal of the data acquisition circuit is electrically connected to the input terminal of the control board circuit.

[0030] The automatic calibration system for the hydraulic proportional valve data acquisition card also includes a band limit switch.

[0031] The aforementioned band limit switch has several positions, and by triggering the switch at different positions, the displacement of the corresponding position is calibrated.

[0032] The displacement sensor includes a spring, a Hall plate, an electromagnet, and a valve core probe.

[0033] The aforementioned band limit switch uses a photosensitive sensor to detect the position of the valve core probe at different gear positions.

[0034] The control board circuit is used to output a PWM signal to the drive board circuit. The drive board circuit adjusts the current of the electromagnet in the displacement sensor. The electromagnet applies an electromagnetic force to the valve core probe. Under the combined action of the electromagnetic force and the spring force, the valve core probe is displaced, and the displacement signal is output to the data acquisition card to be calibrated and the calibrated test bench.

[0035] The data acquisition circuit acquires the displacement signal from the displacement sensor, converts it into displacement original code, and sends it to the control circuit.

[0036] The calibrated test bench collects the displacement signal from the displacement sensor, converts it into a displacement physical quantity, and sends it to the data acquisition card to be calibrated.

[0037] Another aspect of the present invention discloses an automatic calibration method for a hydraulic proportional valve data acquisition card, applied to the aforementioned automatic calibration system for a hydraulic proportional valve data acquisition card, comprising the following steps:

[0038] The host computer data acquisition module sends calibration commands and parameters to the data acquisition card to be calibrated.

[0039] After receiving the data acquisition command sent by the upper computer data acquisition module, the to-be-calibrated data acquisition card performs signal excitation on the solenoid valve or displacement sensor. The to-be-calibrated data acquisition card and the calibrated test bench collect the signals corresponding to the solenoid valve or displacement sensor; the to-be-calibrated data acquisition card obtains the corresponding digital quantity original code; the calibrated test bench obtains the corresponding physical quantity data.

[0040] The to-be-calibrated data acquisition card collects the physical quantity data of the calibrated test bench, forms a sample with the data original code and the physical quantity, and repeats the above steps to obtain multiple groups of data samples.

[0041] The to-be-calibrated data acquisition card sends the multiple groups of samples it has collected to the upper computer data acquisition module, and the acquisition module calculates the data calibration coefficient of the hydraulic proportional valve data acquisition card according to the calibration algorithm.

[0042] Furthermore, the process of calibrating N data samples for the sensor is as follows:

[0043] S101: Power on the calibrated test bench, the to-be-calibrated data acquisition card, the solenoid valve or displacement sensor.

[0044] S102: Start the upper computer calibration software in the upper computer data acquisition module, select the to-be-calibrated data acquisition card and the solenoid valve or displacement sensor, and send the calibration command and parameters.

[0045] S103: After receiving the command, the to-be-calibrated data acquisition card resets the sample number i = 1.

[0046] S104: The to-be-calibrated data acquisition card starts to apply the excitation signal, clears the timer and starts it.

[0047] S105: When the timing is up, the to-be-calibrated data acquisition card collects the data original code, and collects the physical quantity data collected by the calibrated test bench at the corresponding moment, and forms a sample with the data original code and the physical quantity data. S106: If i < N, update the sample number, i = i + 1, and enter step S104 to collect the next sample data; otherwise, when the number of collected sample data meets the requirements, exit the loop and enter step S107.

[0048] S107: Send the sample data to the acquisition module, run the calibration algorithm to obtain the calibration result, and this calibration process ends.

[0049] Furthermore, in step S104, when the drive board card in the to-be-calibrated data acquisition card applies the excitation signal, if calibrating the current, control the drive board card to send the pwm with the corresponding duty cycle.

[0050] The value of the pwm with the corresponding duty cycle depends on the parameters in the data acquisition command sent by the upper computer data acquisition module.

[0051] Furthermore, when the solenoid valve is excited by a signal, the process of collecting the k-th data sample is as follows:

[0052] The data acquisition card to be calibrated adjusts the current of the electromagnet by issuing a PWM duty cycle, while the calibrated test bench uses a current transformer to acquire the electromagnet current I. k The control driver board acquires the transformed original code D. k , (D k I k The k-th data sample is used to calibrate the current.

[0053] The system repeatedly collects data N times to obtain the current calibration table {(D)}. k I k )}, k=1,2,…N.

[0054] Furthermore, the calibration method for the displacement sensor is as follows:

[0055] S201: Assume the band limit switch has 5 positions, P1-P5, and the duty cycle signal sent by the acquisition card is Duty, with a duty cycle range of [W0, W1].

[0056] S202: Enable band travel positioning switch, initialize and perform Pi range signal calibration, i=1.

[0057] S203: The duty cycle signal output by the data acquisition card to be calibrated gradually increases from W0 until the Pi limit switch is triggered.

[0058] S204: The data acquisition card to be calibrated has stopped sending PWM signals to the electromagnet, and the position is set to Pi.

[0059] S205: The data acquisition card to be calibrated acquires the displacement signal of the displacement sensor, and the calibrated test bench acquires the physical quantity data of the displacement sensor to form a sample.

[0060] S206: i = i + 1, return to S203, perform Pi file position calibration, until P5 file calibration is completed.

[0061] S207: Send the sample data to the host computer data acquisition module, run the calibration algorithm to obtain the calibration result of the displacement acquisition circuit, and the displacement calibration process ends.

[0062] Furthermore, when the locking switch is enabled, the test valve core probe is triggered by the limit switch in the P1-P5 range. The electromagnetic force is removed from the data acquisition card to be calibrated, and the valve core probe is locked in the set position.

[0063] When the locking switch is invalid, the test valve core returns to the zero position under the action of spring force.

[0064] Compared with the prior art, the beneficial effects of the present invention are:

[0065] 1. Automated calibration of multiple control drive boards greatly improves the calibration efficiency of sensors.

[0066] 2. The data collected by the host computer data acquisition and monitoring module is integrated and displayed, avoiding errors from manual data recording and improving the efficiency of data integration. Attached Figure Description

[0067] Figure 1 A block diagram of an automatic sensor calibration system provided in an embodiment.

[0068] Figure 2 The schematic diagram for current sensor calibration provided in the embodiment.

[0069] Figure 3 The schematic diagram for displacement sensor calibration provided in the embodiment.

[0070] Figure 4 A structural diagram of the Hall displacement sensor provided in the embodiment.

[0071] The components include: 1. Spring; 2. Pressure cap; 3. Fixing cap; 4. Probe; 5. Mounting housing; 6. Hall effect plate; 7. Magnet; 8. Sealing ring. Detailed Implementation

[0072] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0073] Example 1

[0074] In this embodiment, as Figure 1 As shown, an automatic calibration system for a hydraulic proportional valve data acquisition card includes a host computer data acquisition module, a pre-calibrated test bench, a data acquisition card to be calibrated, a solenoid valve, a displacement sensor, and a power supply module.

[0075] The host computer data acquisition module is electrically connected to the calibrated test bench and the data acquisition card to be calibrated.

[0076] The solenoid valves are electrically connected to the calibrated test bench and the data acquisition card to be calibrated.

[0077] The displacement sensor is electrically connected to the test bench and the data acquisition card, respectively.

[0078] The host computer data acquisition module is used to send calibration commands and parameters to the data acquisition card to be calibrated.

[0079] The calibrated test bench is electrically connected to the data acquisition card to be calibrated.

[0080] The data acquisition card to be calibrated is used to receive calibration commands and parameters issued by the host computer data acquisition module, and then to excite the solenoid valve or displacement sensor by signal and collect the corresponding digital original code.

[0081] The calibrated test bench collects corresponding physical quantity data after being excited by a solenoid valve or displacement sensor.

[0082] The data acquisition card to be calibrated sends a sample composed of digital original code and physical data to the host computer data acquisition module, which then completes the calibration according to the calibration algorithm.

[0083] The power supply module is used to provide power to the solenoid valve, displacement sensor, data acquisition card to be calibrated, and calibrated test bench.

[0084] In this embodiment, when the solenoid valve is excited by a signal, the current signal of the solenoid valve is collected.

[0085] When the displacement sensor is excited by a signal, the displacement signal of the hydraulic proportional valve spool of the displacement sensor is collected.

[0086] More specifically, when the solenoid valve is excited by a signal.

[0087] The data acquisition card to be calibrated includes a control board circuit, a driver board circuit, and a data acquisition circuit.

[0088] The output terminal of the control board circuit is electrically connected to the input terminal of the drive board circuit; the output terminal of the drive board circuit is electrically connected to the input terminal of the solenoid valve; and the output terminal of the data acquisition circuit is electrically connected to the input terminal of the control board circuit.

[0089] The solenoid valve serves as the load for the drive circuit.

[0090] The control board circuit is used to output a PWM signal to the driver board circuit, which in turn adjusts the current in the solenoid valve.

[0091] The data acquisition circuit is used to acquire the current signal of the solenoid valve, convert it into the original code of the current, and send it to the control board circuit.

[0092] The calibrated test bench is used to collect the current signal of the solenoid valve, convert it into a current physical quantity, and send it to the data acquisition card to be calibrated.

[0093] The data acquisition card to be calibrated coordinates and collects the physical quantities of current and the original code of current collected by the calibrated test bench to obtain the calibration table of current calibration.

[0094] More specifically, when a displacement sensor is excited by a signal.

[0095] The data acquisition card to be calibrated includes a control circuit, a drive circuit, and a data acquisition circuit.

[0096] The output terminal of the control circuit is electrically connected to the input terminal of the drive circuit, the output terminal of the drive circuit is electrically connected to the displacement sensor, and the output terminal of the data acquisition circuit is electrically connected to the input terminal of the control board circuit.

[0097] The automatic calibration system for the hydraulic proportional valve data acquisition card also includes a band limit switch.

[0098] The aforementioned band limit switch has several positions, and by triggering the switch at different positions, the displacement of the corresponding position is calibrated.

[0099] The displacement sensor includes a spring, a Hall plate, an electromagnet, and a valve core probe.

[0100] The aforementioned band limit switch uses a photosensitive sensor to detect the position of the valve core probe at different gear positions.

[0101] The control board circuit is used to output a PWM signal to the drive board circuit. The drive board circuit adjusts the current of the electromagnet in the displacement sensor. The electromagnet applies an electromagnetic force to the valve core probe. Under the combined action of the electromagnetic force and the spring force, the valve core probe is displaced, and the displacement signal is output to the data acquisition card to be calibrated and the calibrated test bench.

[0102] The data acquisition circuit acquires the displacement signal from the displacement sensor, converts it into displacement original code, and sends it to the control circuit.

[0103] The calibrated test bench collects the displacement signal from the displacement sensor, converts it into a displacement physical quantity, and sends it to the data acquisition card to be calibrated.

[0104] Example 2

[0105] An automatic calibration method for a hydraulic proportional valve data acquisition card, applied to an automatic calibration system for a hydraulic proportional valve data acquisition card as described in Example 1, includes the following steps:

[0106] The host computer data acquisition module sends calibration commands and parameters to the data acquisition card to be calibrated.

[0107] After receiving the data acquisition command from the host computer data acquisition module, the data acquisition card to be calibrated excites the solenoid valve or displacement sensor. The data acquisition card to be calibrated and the calibrated test bench acquire the corresponding signals of the solenoid valve or displacement sensor. The data acquisition card to be calibrated obtains the corresponding digital original code. The calibrated test bench obtains the corresponding physical quantity data.

[0108] The data acquisition card to be calibrated collects the physical quantity data of the calibrated test bench, forms a sample with the data original code and the physical quantity, and repeats the above steps to obtain multiple groups of data samples.

[0109] The data acquisition card to be calibrated sends the multiple groups of samples collected to the host computer data acquisition module, and the acquisition module calculates the data calibration coefficient of the hydraulic proportional valve data acquisition card according to the calibration algorithm.

[0110] In this embodiment, the process of calibrating N data samples for the sensor is as follows:

[0111] S101: Power on the calibrated test bench, the data acquisition card to be calibrated, the solenoid valve or the displacement sensor;

[0112] S102: Start the host computer calibration software in the host computer data acquisition module, select the data acquisition card to be calibrated and the solenoid valve or the displacement sensor, and send the calibration command and parameters;

[0113] S103: After receiving the command, the data acquisition card to be calibrated resets the sample number i = 1;

[0114] S104: The data acquisition card to be calibrated starts to apply the excitation signal, clears the timer and starts it;

[0115] S105: When the timing is up, the data acquisition card to be calibrated collects the data original code, and collects the physical quantity data collected by the calibrated test bench at the corresponding moment, and forms a sample with the data original code and the physical quantity data;

[0116] S106: If i < N, update the sample number, i = i + 1, enter step S104, and collect the next sample data; otherwise, when the number of collected sample data meets the requirements, exit the loop and enter step S107;

[0117] S {107}: Send the sample data to the acquisition module, run the calibration algorithm to obtain the calibration result, and the calibration process ends.

[0118] The sensors here refer to solenoid valves and displacement sensors.

[0119] More specifically, in step S104, when the drive board card in the data acquisition card to be calibrated applies the excitation signal, if calibrating the current, control the drive board card to send the pwm with the corresponding duty cycle.

[0120] The value of the pwm with the corresponding duty cycle depends on the parameters in the data acquisition command sent by the host computer data acquisition module.

[0121] More specifically, when performing signal excitation on the solenoid valve, the collection process of the k-th data sample is as follows:

[0122] The data acquisition card to be calibrated adjusts the current of the electromagnet by issuing a PWM duty cycle, while the calibrated test bench uses a current transformer to acquire the electromagnet current I. k The control driver board acquires the transformed original code D. k , (D k I k The k-th data sample is used to calibrate the current.

[0123] The system repeatedly collects data N times to obtain the current calibration table {(D)}. k I k )}, k=1,2,…N.

[0124] More specifically, the calibration method for the displacement sensor is as follows:

[0125] S201: Assume the band limit switch has 5 positions, P1-P5, and the duty cycle signal sent by the acquisition card is Duty, with a duty cycle range of [W0, W1].

[0126] S202: Enable band travel positioning switch, initialize and perform Pi range signal calibration, i=1.

[0127] S203: The duty cycle signal output by the data acquisition card to be calibrated gradually increases from W0 until the Pi limit switch is triggered.

[0128] S204: The data acquisition card to be calibrated has stopped sending PWM signals to the electromagnet, and the position is set to Pi.

[0129] S205: The data acquisition card to be calibrated acquires the displacement signal of the displacement sensor, and the calibrated test bench acquires the physical quantity data of the displacement sensor to form a sample.

[0130] S206: i = i + 1, return to S203, perform Pi file position calibration, until P5 file calibration is completed.

[0131] S207: Send the sample data to the host computer data acquisition module, run the calibration algorithm to obtain the calibration result of the displacement acquisition circuit, and the displacement calibration process ends.

[0132] More specifically, when the locking switch is enabled, the test valve core probe is triggered by the limit switch in the P1-P5 range. The electromagnetic force is removed from the data acquisition card to be calibrated, and the valve core probe is locked in the set position.

[0133] When the locking switch is invalid, the test valve core returns to the zero position under the action of spring force.

[0134] Example 3

[0135] In this embodiment, an automatic sensor calibration system and calibration method as described in Embodiments 1 and 2 are used to calibrate the sensor as follows: Figure 4 The Hall displacement sensor shown is calibrated.

[0136] The Hall displacement sensor includes a spring 1, a pressure cap 2, a fixing cap 3, a probe 4, a mounting housing 5, a Hall plate 6, a magnet 7, and a sealing ring 8.

[0137] The calibration steps are as follows:

[0138] The host computer monitoring software configures the test objects and test parameters, and sends commands via CAN communication.

[0139] After receiving the data, the control drive board sends multiple sets of related commands to the displacement sensor in sequence, and also sends related commands to the test bench; the related commands are related to the configuration data.

[0140] The control board collects the original code data of the sensor under test and the data of the calibrated test bench, and sends the data to the monitoring software.

[0141] The monitoring software runs the data processing module to complete the sensor calibration.

[0142] The calibration method for a pre-calibrated test bench is as follows:

[0143] For current acquisition, the test bench is calibrated using a high-precision current transformer; for displacement acquisition, the test bench is pre-calibrated using instruments such as vernier calipers at the P1-P5 range positions.

[0144] The specific steps for calibrating a Hall displacement sensor are as follows:

[0145] S1: Controller enables limit switch.

[0146] S2: For the PK position, the PI controller outputs a PWM wave to the electromagnet drive circuit.

[0147] S3: When the electromagnet is energized, it generates electromagnetic force, which works together with the spring force on the probe. When the position triggers the PK limit switch, the PI controller stops outputting, and the probe is locked in place.

[0148] S4: The controller sends test commands to the test bench and collects the current source code data and test bench data.

[0149] S5: k = k + 1, return to S2, and proceed to the next gear data acquisition until all gear data acquisition is completed.

[0150] S6: The controller disables the limit switch, and the valve core probe retracts to the zero position.

[0151] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the claims of the present invention.

Claims

1. An automatic calibration system for a hydraulic proportional valve data acquisition card, characterized in that, It includes a host computer data acquisition module, a calibrated test bench, a data acquisition card to be calibrated, a solenoid valve, a displacement sensor, and a power supply module; The host computer data acquisition module is electrically connected to the calibrated test bench and the data acquisition card to be calibrated, respectively. The solenoid valves are electrically connected to the calibrated test bench and the data acquisition card to be calibrated, respectively. The displacement sensors are electrically connected to the test bench and the data acquisition card, respectively. The host computer data acquisition module is used to send calibration commands and parameters to the data acquisition card to be calibrated; The calibrated test bench is electrically connected to the data acquisition card to be calibrated. The data acquisition card to be calibrated is used to receive calibration commands and parameters from the host computer data acquisition module, and then to excite the solenoid valve or displacement sensor by signal and collect the corresponding digital source code. The calibrated test bench collects corresponding physical quantity data after being excited by a solenoid valve or displacement sensor. The data acquisition card to be calibrated sends a sample composed of digital original code and physical data to the host computer data acquisition module, which then completes the calibration according to the calibration algorithm. The power supply module is used to provide power to the solenoid valve, displacement sensor, data acquisition card to be calibrated, and calibrated test bench.

2. The automatic calibration system for a hydraulic proportional valve data acquisition card according to claim 1, characterized in that, When the solenoid valve is excited by a signal, the current signal of the solenoid valve is collected. When the displacement sensor is excited by a signal, the valve core displacement signal of the hydraulic proportional valve in the displacement sensor is collected.

3. The automatic calibration system for a hydraulic proportional valve data acquisition card according to claim 2, characterized in that, When the solenoid valve is excited by a signal; The data acquisition card to be calibrated includes a control board circuit, a driver board circuit, and a data acquisition circuit. The output terminal of the control board circuit is electrically connected to the input terminal of the drive board circuit; the output terminal of the drive board circuit is electrically connected to the input terminal of the solenoid valve; the output terminal of the data acquisition circuit is electrically connected to the input terminal of the control board circuit. The solenoid valve serves as the load for the drive board circuit. The control board circuit is used to output PWM signals to the drive board circuit, and the drive board circuit adjusts the current in the solenoid valve. The data acquisition circuit is used to acquire the current signal of the solenoid valve, convert it into the original code of the current, and send it to the control board circuit. The calibrated test bench is used to collect the current signal of the solenoid valve, convert it into a current physical quantity, and send it to the data acquisition card to be calibrated. The data acquisition card to be calibrated coordinates and collects the physical quantities of current and the original code of current collected by the calibrated test bench to obtain the calibration table of current calibration.

4. The automatic calibration system for a hydraulic proportional valve data acquisition card according to claim 2, characterized in that, When the displacement sensor is excited by a signal; The data acquisition card to be calibrated includes a control circuit, a drive circuit, and a data acquisition circuit; The output terminal of the control circuit is electrically connected to the input terminal of the drive circuit, the output terminal of the drive circuit is electrically connected to the displacement sensor, and the output terminal of the data acquisition circuit is electrically connected to the input terminal of the control circuit. The automatic calibration system for the hydraulic proportional valve data acquisition card also includes a band limit switch; The band limit switch has several positions, and the displacement of the corresponding position is calibrated by triggering the switch at different positions. The displacement sensor described above includes a spring, a Hall small plate, an electromagnet, and a valve core probe; The band travel switch detects the positions of the valve core probes at different gears through a photosensitive sensor; The control circuit is used to output a PWM signal to the drive circuit. The drive circuit adjusts the current of the electromagnet in the displacement sensor. The electromagnet applies an electromagnetic force to the valve core probe. Under the combined action of the electromagnetic force and the spring force, the valve core probe undergoes displacement and outputs a displacement signal to the data acquisition card to be calibrated and the calibrated test bench; The data acquisition circuit collects the displacement signal of the displacement sensor, converts it into a displacement original code, and sends it to the control circuit; The calibrated test bench collects the displacement signal of the displacement sensor, converts it into a displacement physical quantity, and sends it to the data acquisition card to be calibrated.

5. An automatic calibration method for a hydraulic proportional valve data acquisition card, applied to the automatic calibration system for a hydraulic proportional valve data acquisition card as described in any one of claims 1 to 4, characterized in that, It includes the following steps: The upper computer data acquisition module issues a calibration command and parameters to the data acquisition card to be calibrated; After receiving the data acquisition command issued by the upper computer data acquisition module, the data acquisition card to be calibrated performs signal excitation on the solenoid valve or displacement sensor. The data acquisition card to be calibrated and the calibrated test bench collect the corresponding signals of the solenoid valve or displacement sensor; the data acquisition card to be calibrated obtains the corresponding digital quantity original code; the calibrated test bench obtains the corresponding physical quantity data; The data acquisition card to be calibrated collects the physical quantity data of the calibrated test bench, forms a sample with the digital quantity original code and the physical quantity, and repeats the above steps to obtain multiple groups of data samples; The data acquisition card to be calibrated sends the multiple groups of samples collected to the upper computer data acquisition module, and the upper computer data acquisition module calculates the data calibration coefficient of the data acquisition card of the hydraulic proportional valve according to the calibration algorithm.

6. The automatic calibration method for a hydraulic proportional valve data acquisition card according to claim 5, characterized in that, The process of calibrating N data samples for the sensor is as follows: S101: Power on the calibrated test bench, the data acquisition card to be calibrated, the solenoid valve or displacement sensor; S102: Start the upper computer calibration software in the upper computer data acquisition module, select the data acquisition card to be calibrated and the solenoid valve or displacement sensor, and issue a calibration command and parameters; S103: After receiving the command, the data acquisition card to be calibrated resets the sample number i = 1; S104: The data acquisition card to be calibrated starts to apply an excitation signal, clears the timer and starts it; S105: When the timing is up, the data acquisition card to be calibrated collects the digital quantity original code and collects the physical quantity data collected by the calibrated test bench at the corresponding moment, and forms a sample with the digital quantity original code and the physical quantity data; S106: If i < N, update the sample number, i = i + 1, enter step S104, and collect the next sample data; otherwise, when the number of collected sample data meets the requirements, exit the loop and enter step S107; S107: Send the sample data to the upper computer data acquisition module, run the calibration algorithm to obtain the calibration result, and the calibration process ends.

7. The automatic calibration method for a hydraulic proportional valve data acquisition card according to claim 6, characterized in that, In step S104, when the drive board in the data acquisition card to be calibrated applies an excitation signal, if it is current calibration, control the drive board to emit a pwm with the corresponding duty cycle; The value of the pwm with the corresponding duty cycle depends on the parameters in the data acquisition command issued by the upper computer data acquisition module.

8. The automatic calibration method for a hydraulic proportional valve data acquisition card according to claim 6, characterized in that, When the solenoid valve is excited by a signal, the process of collecting the k-th data sample is as follows: The data acquisition card to be calibrated adjusts the current of the electromagnet by sending PWM duty ratio, and the calibrated test platform collects the electromagnet current I by using a current transformer k , the control drive board card collects the original code D after conversion k , (D k , I k ) constitute the kth data sample of current calibration; The system repeatedly collects N times to obtain a current calibration adjustment table { (D k , I k )}, k = 1, 2, … N.

9. The automatic calibration method for a hydraulic proportional valve data acquisition card according to claim 6, characterized in that, The calibration method for displacement sensors is as follows: S201: Assume the band limit switch has 5 positions, P1-P5, and the duty cycle signal sent by the acquisition card is Duty, with a duty cycle range of [W0,W1]. S202: Enable band travel positioning switch, initialize and perform Pi range signal calibration, i=1; S203: The duty cycle signal output by the data acquisition card to be calibrated gradually increases from W0 until the Pi limit switch is triggered; S204: The data acquisition card to be calibrated stops sending PWM signals to the electromagnet, and the position is locked in the Pi position; S205: The data acquisition card to be calibrated acquires the displacement signal of the displacement sensor, and the calibrated test bench acquires the physical quantity data of the displacement sensor to form a sample. S206: i=i+1, return to S203, perform Pi gear position calibration until P5 gear calibration is completed; S207: Send the sample data to the host computer data acquisition module, run the calibration algorithm to obtain the calibration result of the displacement acquisition circuit, and the displacement calibration process ends.

10. The automatic calibration method for a hydraulic proportional valve data acquisition card according to claim 9, characterized in that, When the locking switch is enabled, the test valve core probe is triggered by the limit switch in the P1-P5 range. The electromagnetic force is removed from the data acquisition card to be calibrated, and the valve core probe is locked in the set position. When the locking switch is disabled, the test valve core returns to the zero position under the action of spring force.

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