CN111487949B - Debugging method and device for reversing valve control panel and reversing valve control panel - Google Patents
Debugging method and device for reversing valve control panel and reversing valve control panel Download PDFInfo
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- CN111487949B CN111487949B CN202010329713.8A CN202010329713A CN111487949B CN 111487949 B CN111487949 B CN 111487949B CN 202010329713 A CN202010329713 A CN 202010329713A CN 111487949 B CN111487949 B CN 111487949B
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- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0256—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults injecting test signals and analyzing monitored process response, e.g. injecting the test signal while interrupting the normal operation of the monitored system; superimposing the test signal onto a control signal during normal operation of the monitored system
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Abstract
The embodiment of the invention discloses a debugging method and device of a reversing valve control panel and the reversing valve control panel. The debugging method comprises the following steps: receiving an externally input control signal, and outputting an initial control voltage to an amplification module so that the amplification module adjusts the opening size of the proportional directional valve according to the control voltage; when a current sensor signal fed back by a sensor is the same as a preset sensor signal, acquiring a control voltage; wherein the current sensor signal is associated with an opening size of the proportional directional valve; establishing a control signal-control voltage incidence relation; and generating a control signal-control voltage relation curve according to at least two groups of control signal-control voltage incidence relations. The technical scheme provided by the embodiment of the invention can ensure that the flow passing through the proportional reversing valve meets the standard requirement when a control signal is given, and has high debugging efficiency and better batch performance consistency.
Description
Technical Field
The embodiment of the invention relates to the technical field of control of proportional reversing valves, in particular to a method and a device for debugging a reversing valve control panel and the reversing valve control panel.
Background
The proportional reversing valve is a hydraulic element capable of continuously controlling the flowing direction and the overflowing magnitude of media such as hydraulic oil, and is very commonly and indispensably applied to main machines such as injection molding machines, machine tools, engineering machinery and the like.
The control panel of the reversing valve comprises a proportional reversing valve and an amplification control panel, when the control panel of the reversing valve leaves a factory, a plurality of performance tests are required, one test of a control signal-output flow is particularly important, the proportional reversing valve is driven by giving a control signal of the amplification control panel to test the flow value passing through the proportional reversing valve, and due to various reasons, the actual passing flow corresponding to the given control signal and the preset passing flow do not meet the requirements, at the moment, the output current gain on the amplification control panel is adjusted by adjusting a fine adjustment resistor on the amplification control panel, so that the opening size of the proportional reversing valve is adjusted, and the actual passing flow is equal to the preset passing flow.
However, due to the fact that adjustment cannot be performed in one step, long time is needed, manual adjustment accuracy is poor, and due to the reasons, performance batch consistency of the proportional directional valve is poor, and debugging efficiency is low.
Disclosure of Invention
The invention provides a debugging method and device for a reversing valve control panel and the reversing valve control panel, which are used for improving the batch performance consistency and the debugging efficiency.
In a first aspect, an embodiment of the present invention provides a method for debugging a control board of a directional control valve, which is executed by a controller, where the method includes:
receiving an externally input control signal, and outputting an initial control voltage to an amplification module so that the amplification module adjusts the opening size of the proportional directional valve according to the control voltage;
when a current sensor signal fed back by a sensor is the same as a preset sensor signal, acquiring a control voltage; wherein the current sensor signal is associated with an opening size of the proportional directional valve;
establishing a control signal-control voltage incidence relation;
and generating a control signal-control voltage relation curve according to at least two groups of control signal-control voltage incidence relations.
Optionally, when the current sensor signal fed back by the sensor is the same as the preset sensor signal, acquiring the control voltage includes:
acquiring the current sensor signal fed back by a sensor;
correcting the control voltage according to the preset sensor signal, the current sensor signal and the current control voltage, so that the amplification module adjusts the opening size of the proportional reversing valve according to the corrected control voltage;
repeatedly executing the steps until the current sensor signal is the same as the preset sensor signal;
and acquiring the control voltage.
Optionally, the modifying the control voltage according to the preset sensor signal, the current sensor signal and the current control voltage includes:
obtaining a correction signal through proportional integral derivative control according to the preset sensor signal and the current sensor signal;
and correcting the control voltage according to the correction signal and the current control voltage.
Optionally, the generating the control signal-control voltage relation curve according to at least two groups of the control signal-control voltage association relations includes:
and generating a control signal-control voltage relation curve by linear fitting according to at least two groups of control signal-control voltage incidence relations.
Optionally, the generating the control signal-control voltage relation curve according to at least two groups of the control signal-control voltage association relations includes:
and according to at least two groups of control signal-control voltage incidence relations, curve fitting is carried out to generate a control signal-control voltage relation curve.
Optionally, the generating the control signal-control voltage relation curve according to at least two groups of the control signal-control voltage association relations includes:
and according to at least two groups of control signal-control voltage incidence relations, piecewise linear fitting is carried out to generate a broken line type control signal-control voltage relation curve.
Optionally, the sensor comprises a flow sensor or a displacement sensor.
In a second aspect, an embodiment of the present invention further provides a debugging apparatus for a control board of a directional control valve, including:
the initial control voltage output module is used for receiving an externally input control signal and outputting an initial control voltage to the amplification module so that the amplification module adjusts the opening size of the proportional directional valve according to the control voltage;
the control voltage acquisition module is used for acquiring control voltage when a current sensor signal fed back by the sensor is the same as a preset sensor signal; wherein the current sensor signal is associated with an opening size of the proportional directional valve;
the incidence relation establishing module is used for establishing a control signal-control voltage incidence relation;
the relation curve generating module is used for generating a relation curve between the control signal and the control voltage according to at least two groups of the relation between the control signal and the control voltage;
wherein the control voltage, the opening size of the proportional reversing valve, and the present sensor signal are correlated.
In a third aspect, an embodiment of the present invention further provides a reversing valve control plate, including: the device comprises a differential amplifier, a buffer generator, a controller, an amplifying module and a proportional reversing valve;
the differential amplifier is connected with the buffer generator and is used for receiving and amplifying a control signal;
the buffer generator is connected with the controller and is used for carrying out ramp processing on the control signal;
the amplification module is connected with the controller and used for controlling the opening size of the proportional reversing valve according to the control voltage sent by the controller;
when the one or more programs are executed by the controller, the controller is enabled to implement the proportional reversing valve testing method of any embodiment of the present application.
Optionally, the reversing valve control panel further comprises a sensor interface and a parameter input interface;
the sensor interface is connected with the controller and used for receiving a current sensor signal fed back by the sensor; the parameter input interface is connected with the controller and used for receiving an externally input control signal-preset sensor signal incidence relation.
According to the debugging method of the reversing valve control board disclosed by the embodiment of the invention, when the current sensor signal fed back by the sensor is equal to the preset sensor signal, the control voltage is obtained and the control signal-control voltage incidence relation is established, so that when the reversing valve control board control signal is given again, the flow passing through the proportional reversing valve meets the standard requirement.
Drawings
Fig. 1 is a flowchart of a debugging method for a control board of a reversing valve according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a debugging system for a control board of a reversing valve according to an embodiment of the present invention;
fig. 3 is a flowchart of a debugging method of a control board of a reversing valve according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a debugging device of a control board of a reversing valve according to a third embodiment of the present invention;
fig. 5 is a schematic diagram of a display interface of an upper computer according to a fourth embodiment of the present invention.
FIG. 6 is a graph illustrating a relationship between a control signal and a control voltage according to a fourth embodiment of the present invention;
FIG. 7 is a graph illustrating another control signal-control voltage relationship according to a fourth embodiment of the present invention;
fig. 8 is a schematic diagram of another relationship curve between the control signal and the control voltage according to the fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a debugging method of a control board of a directional control valve according to an embodiment of the present invention. The embodiment of the application is suitable for debugging the reversing valve control panel when the reversing valve control panel leaves a factory. The method is executed by a debugging device of the reversing valve control panel, the debugging device is realized by software and/or hardware and is specifically configured in the reversing valve control panel.
The debugging method of the control board of the reversing valve shown in figure 1 comprises the following steps:
and S110, receiving an externally input control signal, and outputting an initial control voltage to the amplification module so that the amplification module adjusts the opening size of the proportional directional valve according to the control voltage.
Specifically, before the controller executes the debugging method of the control panel of the directional valve, a debugging system of the control panel of the directional valve needs to be built, for example, fig. 2 is a schematic diagram of the debugging system of the control panel of the directional valve according to an embodiment of the present invention, and referring to fig. 2, the debugging system includes the control panel of the directional valve, the parameter input module 40 and the sensor 30, and the control panel of the directional valve includes the controller 10, the amplification module 20 and the proportional directional valve 70. Specifically, the parameter input module 40 sends the control signal-preset sensor association relationship to the controller 10 through the parameter input interface H. The controller 10 receives control signals input from the outside through the interfaces D and E. The interface a and the interface B are used for externally accessing an operating power supply for the reversing valve control board to work normally and for the current required for driving the proportional reversing valve 70. The sensor 30 sends the current sensor signal acquired by the sensor to the controller 10 through the sensor interface J.
Specifically, the control signal may be a voltage signal or a current signal, which is not limited herein and can be set by a person skilled in the art according to actual situations. The control signal may be provided by a signal generator, and when the parameter input module 40 is an upper computer, the control signal may also be provided by the upper computer. It can be understood that, when the proportional reversing valve is a one-way valve, the control signal includes control information of the size of the opening of the proportional reversing valve; when the proportional reversing valve is a multi-directional valve, the control signal not only includes control information for controlling the size of the opening of the proportional reversing valve, but also includes information for controlling the direction of the opening of the proportional reversing valve. For example, when the proportional directional valve is a bidirectional valve, two control signals which make the opening of the proportional directional valve have the same size and different opening directions can be represented by a voltage signal of-10V and a voltage signal of + 10V.
Specifically, after receiving the control signal, the controller determines an initial control voltage corresponding to the control signal according to an initial control signal-control voltage association relationship, and sends the control voltage to the amplification module, and the amplification module controls the opening size of the proportional directional valve according to the initial control voltage. It can be understood that when the proportional reversing valve is a multi-way valve, the amplifying module can also control the opening direction of the proportional reversing valve according to the control voltage. For example, the initial control voltage may be calculated by the controller according to the control signal.
And S120, when the current sensor signal fed back by the sensor is the same as the preset sensor signal, acquiring a control voltage.
And S130, establishing a control signal-control voltage association relation.
The particular type of current sensor signal is determined by the sensor type, and the sensor may alternatively comprise a flow sensor, a displacement sensor, or other sensors known to those skilled in the art.
Wherein the current sensor signal is associated with the opening size of the proportional directional valve. For example, the meaning of the current sensor signal being associated with the opening size of the proportional directional valve will be explained below by way of example of the sensor comprising a flow sensor. For example, as shown in fig. 2, the flow sensor is disposed at the oil return port of the proportional reversing valve and is configured to measure an over flow at the oil return port of the proportional reversing valve, it can be understood that when the opening size of the proportional reversing valve changes, the over flow at the oil return port of the proportional reversing valve changes, and then a current sensor signal acquired by the flow sensor changes.
Specifically, when the amplification module controls the proportional directional valve to open according to the initial control voltage, so that the proportional directional valve has an initial opening size, the current sensor signal fed back by the sensor is usually different from the preset sensor signal for various reasons, and the control voltage at this time cannot be used to establish an effective control signal-control voltage correlation relationship. When the current sensor signal fed back by the sensor is different from the preset sensor signal, the controller can correct the control voltage to adjust the opening size of the proportional reversing valve, so that the current sensor signal fed back by the sensor is changed, when the current sensor signal fed back by the sensor is the same as the preset sensor signal, the control voltage is obtained, and the control voltage at the moment can be used for establishing an effective control signal-control voltage association relation.
For example, assume that the relationship between the control signal received by the controller and the preset sensor signal is 10V-100L/min. When the received control signal is 10V, the controller may determine the initial control voltage (e.g., the initial control voltage is V1) according to the initial control signal-control voltage correlation, and the current sensor signal collected by the sensor is usually not equal to 100L/min for various reasons, e.g., the current sensor signal is 80L/min. Then, the controller will modify the control voltage until the current sensor signal collected by the sensor is 100L/min, and acquire the control voltage at this time (for example, the control voltage at this time is V2), so as to establish a correlation of 10V-V2. When the control signal received again by the subsequent controller is 10V, the controller outputs a control voltage with a voltage value of V2 to the amplification module, so that the current sensor signal acquired by the flow sensor is the preset sensor signal.
And S140, generating a control signal-control voltage relation curve according to the at least two groups of control signal-control voltage incidence relations.
Specifically, the number of groups of the control signal-control voltage correlation to be obtained may be set by one skilled in the art according to actual situations, and is not limited herein. The specific manner of generating the control signal-control voltage relation curve can be set by those skilled in the art according to the actual situation, and is not limited herein.
According to the debugging method of the reversing valve control board disclosed by the embodiment of the invention, when the current sensor signal fed back by the sensor is equal to the preset sensor signal, the control voltage is obtained and the control signal-control voltage incidence relation is established, so that when the reversing valve control board control signal is given again, the flow passing through the proportional reversing valve meets the standard requirement.
Example two
Fig. 3 is a flowchart of a debugging method for a control board of a reversing valve according to a second embodiment of the present invention, and the second embodiment of the present invention is optimized and improved based on the technical solutions of the above embodiments.
A method of tuning a control panel of a reversing valve as shown in fig. 3, comprising:
s210, receiving an externally input control signal, and outputting an initial control voltage to the amplification module so that the amplification module adjusts the opening size of the proportional directional valve according to the control voltage.
And S220, acquiring a current sensor signal fed back by the sensor.
And S230, correcting the control voltage according to the preset sensor signal, the current sensor signal and the current control voltage, so that the amplification module adjusts the opening size of the proportional directional valve according to the corrected control voltage.
And S240, repeatedly executing S220-S230 until the current sensor signal is the same as the preset sensor signal.
Specifically, the controller acquires a current sensor signal fed back by the sensor and judges whether the current sensor signal is equal to a preset sensor signal; if the current sensor signal is different from the preset sensor signal, the controller corrects the control voltage according to the preset sensor signal, the current sensor signal and the current control voltage to obtain a corrected control voltage; the controller sends the corrected control voltage to the amplification module, the amplification module adjusts the opening size of the proportional reversing valve according to the corrected control voltage, and the current sensor signal acquired by the sensor changes, so that the control voltage is corrected once, and the control voltage is continuously corrected until the current sensor signal is the same as the preset sensor signal.
Specifically, there are various ways to adjust the current control voltage according to the preset sensor signal and the current sensor signal, and those skilled in the art may set the current control voltage according to the actual situation, which is optional, and S230 specifically includes:
and S231, obtaining a correction signal through proportional integral derivative control according to the preset sensor signal and the current sensor signal.
And S232, correcting the control voltage according to the correction signal and the current control voltage.
Specifically, when the preset sensor signal is different from the current sensor signal, the correction signal is not 0, and the controller corrects the current control voltage according to the correction signal to obtain a corrected control voltage; when the preset sensor signal is the same as the current sensor signal, the correction signal is 0, and the current control voltage is not corrected.
It should be noted that, the specific calculation process of correcting the control voltage according to the correction signal and the current control voltage may be set by a person skilled in the art according to actual situations, and is not limited herein. It should be further noted that, after continuous reciprocating correction, the correction signal at this time is stored until the current sensor signal acquired by the flow sensor is equal to the preset sensor signal, and thus, when the control signal is received again later, the controller controls the amplification module to operate through the control voltage output by operation, so that the opening of the proportional directional valve is opened, and the current sensor signal detected by the sensor is the same as the preset sensor signal.
It can be understood that the method of obtaining the correction signal by the pid control has the advantages of simple algorithm, good robustness and high reliability, so that the correction process of the control voltage is simple, efficient and high in reliability.
And S250, acquiring a control voltage.
And S260, establishing a control signal-control voltage association relation.
And S270, generating a control signal-control voltage relation curve according to the at least two groups of control signal-control voltage incidence relations.
According to the debugging method of the reversing valve control panel disclosed by the embodiment of the invention, the current sensor signal is obtained in real time, and the control voltage is corrected in time when the current sensor signal is different from the preset sensor signal, so that the debugging process of the reversing valve control panel is quick and efficient.
On the basis of the above technical solution, optionally, S270 includes:
and generating a control signal-control voltage relation curve by linear fitting according to the at least two groups of control signal-control voltage relation.
The advantage of this arrangement is that when the reversing valve control panel is used in equipment such as an injection molding machine, the control signal-equipment output relationship can be easily calculated by a user since the control signal-control voltage relationship curve is a straight line. Illustratively, when the reversing valve control panel is applied to an injection molding machine, a user can conveniently calculate a control signal-injection machine ejection pressure relation curve and a control signal-injection machine ejection speed relation curve.
Optionally, S270 includes:
and according to the at least two groups of control signal-control voltage incidence relations, curve fitting is carried out to generate a control signal-control voltage relation curve.
The advantage of this arrangement is that the reversing valve control panel can be used in devices with complex control signal-device output relationships. Illustratively, if the reversing valve control panel is used for controlling the running speed of an actuating mechanism in equipment and the acceleration is small when the equipment is required to start, the acceleration is large in the starting process, and a curve type control signal-control voltage relation curve can meet the working condition requirement.
Optionally, S270 includes:
and according to the at least two groups of control signal-control voltage incidence relations, piecewise linear fitting is carried out to generate a broken line type control signal-control voltage relation curve.
The reversing valve control panel can be applied to equipment with complex control signal-equipment output relation, and is convenient for a user to calculate the control signal-equipment output relation.
EXAMPLE III
The embodiment of the invention also provides a debugging device for the control panel of the reversing valve. Fig. 4 is a schematic structural diagram of a debugging apparatus for a control board of a reversing valve according to a third embodiment of the present invention, and referring to fig. 4, the debugging apparatus for a control board of a reversing valve includes:
an initial control voltage output module 410, configured to receive an externally input control signal and output an initial control voltage to the amplification module, so that the amplification module adjusts the size of the opening of the proportional directional valve according to the control voltage;
a control voltage obtaining module 420, configured to obtain a control voltage when a current sensor signal fed back by the sensor is the same as a preset sensor signal; wherein the current sensor signal is associated with the opening size of the proportional directional valve;
an association relationship establishing module 430, configured to establish a control signal-control voltage association relationship;
a relation curve generating module 440, configured to generate a control signal-control voltage relation curve according to at least two groups of control signal-control voltage association relations;
wherein the control voltage, the opening size of the proportional directional valve and the current sensor signal are correlated.
On the basis of the foregoing technical solution, optionally, the control voltage obtaining module 420 includes:
the current sensor signal acquisition submodule is used for acquiring a current sensor signal fed back by the sensor;
the control voltage correction submodule is used for correcting the control voltage according to the preset sensor signal, the current sensor signal and the current control voltage so that the amplification module adjusts the opening size of the proportional directional valve according to the corrected control voltage;
the voltage correction submodule is used for correcting the current sensor signal and the preset sensor signal according to the current sensor signal;
and the control voltage acquisition submodule is used for acquiring the control voltage.
Optionally, the control voltage correction submodule is specifically configured to obtain a correction signal through proportional-integral-derivative control according to a preset sensor signal and a current sensor signal; and correcting the control voltage according to the correction signal and the current control voltage.
Optionally, the relationship curve generating module 440 is specifically configured to generate a relationship curve between the control signal and the control voltage by linear fitting according to at least two groups of control signal-control voltage association relationships.
Optionally, the relationship curve generating module 440 is specifically configured to generate a control signal-control voltage relationship curve through curve fitting according to at least two groups of control signal-control voltage association relationships.
Optionally, the relationship curve generating module 440 is specifically configured to generate a broken-line-type control signal-control voltage relationship curve through piecewise linear fitting according to at least two groups of control signal-control voltage association relationships.
Optionally, the sensor comprises a flow sensor or a displacement sensor.
The debugging device for the control board of the reversing valve can execute the debugging method for the control board of the reversing valve provided by any embodiment of the application, and has the corresponding functional modules and beneficial effects for executing the debugging of the control board of the reversing valve.
Example four
An embodiment of the present invention further provides a directional control plate, referring to fig. 2, the directional control plate includes: a differential amplifier 50, a buffer generator 60, a controller 10, an amplification module 20, and a proportional directional valve 70;
the differential amplifier 50 is connected to the buffer generator 60 for receiving and amplifying the control signal;
the buffer generator 60 is connected to the controller 10, and is configured to ramp the control signal;
the amplifying module 20 is connected with the controller 10 and is used for controlling the opening size of the proportional directional valve 70 according to the control voltage sent by the controller 10;
when one or more of the programs are executed by the controller 10, the controller 10 is caused to implement the proportional reversing valve testing method of any of the embodiments of the present application.
With continued reference to fig. 2, optionally, the reversing valve control panel further includes a sensor interface J and a parameter input interface H; the sensor interface J is connected with the controller 10 and is used for receiving a current sensor signal fed back by the sensor 30; the parameter input interface H is connected to the controller 10, and is configured to receive an externally input control signal-preset sensor signal association relationship.
According to the reversing valve control board disclosed by the embodiment of the invention, when the current sensor signal fed back by the sensor is equal to the preset sensor signal, the control voltage is obtained and the control signal-control voltage association relation is established, so that when the reversing valve control board control signal is given again, the flow passing through the proportional reversing valve meets the standard requirement.
To illustrate the tuning process of the control board of the directional valve in detail, the following description will be given by way of example with reference to fig. 2.
Illustratively, the parameter input module 40 is an upper computer, and is in communication with the controller 10 through a parameter input interface H, and is configured to input a control signal-preset sensor signal association relationship to the controller 10, and further configured to display a current sensor signal. The sensor 30 is a flow sensor, the measuring range is 0-150L/min, and the transmitting output signal is 0-10V. The proportional reversing valve 70 is of the three-position four-way type, the coils of which are driven by an amplification module 20, the amplification module 20 comprising an amplifier U1 and an amplifier U2, the variation of the received control voltage Ua (or Ub) being proportional to the magnitude Ia (or Ib) of the output current. The type of the external control signals received by the interface D and the interface E is 0- +/-10V, when the control signals are 0- +10V, the proportional directional valve 70 is P-pass A, B-pass T, the opening size of the proportional directional valve is controlled by the amplifier U2, when the control signals are 0- +10V, the proportional directional valve 70 is P-pass B, A-pass T, and the opening size of the proportional directional valve is controlled by the amplifier U1. When the passing flow of the proportional reversing valve is tested, the total pressure drop of the proportional reversing valve needs to be ensured to be constant, namely, the delta P is Pp-Pa-Pb-Pt, wherein Pp is the pressure at the oil port P, Pa is the pressure at the oil port A, Pb is the pressure at the oil port B, and Pt is the pressure at the oil port T, and when the delta P of the three-position four-way proportional reversing valve is 10bar, the maximum passing flow is 120L/min.
Exemplarily, fig. 5 is a schematic diagram of a display interface of an upper computer according to a fourth embodiment of the present invention. Referring to fig. 5, after the debugging system of the reversing valve control board is set up, the control signal-preset sensor signal correlation output to the controller 10 by the upper computer through the parameter input interface H is 10V-100L/min, that is, when the external input control signal is required to be +10V or-10V, the passing flow of the flow sensor is 100L/min.
Then, receive the +10V (or-10V) control signal of external input through interface D and interface E, the control signal passes the front-end processing circuit such as differential amplifier 50, buffer generator 60, etc., and inputs to the controller 10; the controller 10 monitors the control signal and judges the polarity of the control signal (namely, the positive and negative of the voltage of the control signal), and controls the amplifier U2 (or the amplifier U1) to work by operating and outputting the control voltage Ua (or Ub), so that the opening of the proportional directional valve is opened, and the flow sensor detects the flow output; the controller 10 compares a current sensor signal acquired by the flow sensor with a preset flow sensor signal and performs Proportional-Integral-Derivative (PID) Control to obtain a correction signal V, and the controller 10 controls the amplifier U2 (or the amplifier U1) to operate by adjusting the value of the Control voltage Ua (or Ub) through operation according to the correction signal V, so that the opening size of the Proportional directional valve changes, the actual flow signal detected by the flow sensor changes, and thus the first correction of the Control voltage Ua (or the Control voltage Ub) is completed.
Next, the controller 10 compares the current sensor signal collected by the flow sensor with the preset flow sensor signal for the second time to perform PID control, so as to obtain a new correction signal V, and the controller 10 controls the amplifier U2 (or the amplifier U1) to operate through the operation of adjusting the value of the control voltage Ua (or Ub) according to the correction signal V for the second time, so that the opening size of the proportional directional valve changes, the actual flow signal detected by the flow sensor changes, and thus the correction of the second control voltage Ua (or control voltage Ub) is completed.
After continuous adjustment, the current sensor signal collected by the flow sensor is equal to the preset sensor signal, and the correction signal V is stored in the program by the controller 10, so that when +/-10V control signals are input from the interface D and the interface E subsequently, the controller 10 outputs the control voltage Ua (or Ub) through operation according to the updated program to control the amplifier U2 (or the amplifier U1) to operate, so that the opening of the proportional directional valve is opened, and the current sensor signal detected by the flow sensor is equal to the preset sensor signal. At this point, a set of control signal-control voltage correlations is established.
The correlation between the control signal and the preset sensor signal output by the upper computer to the controller 10 through the parameter input interface H is 2V-10L/min, that is, when the external input control signal is required to be +2V or-2V, the passing flow of the flow sensor is 10L/min. The relationship between the working process of the controller 10 and the control signal-preset sensor signal is similar to 10V-100L/min, and the description thereof is omitted. By analogy, a plurality of groups of control signal-control voltage incidence relations can be obtained.
And then, generating a control signal-control voltage relation curve according to the multiple groups of control signal-control voltage incidence relations. And debugging the control panel of the reversing valve is completed. The connection between the control board of the reversing valve and the upper computer and the flow sensor can be disconnected, and the reversing valve is subsequently used in equipment such as an injection molding machine.
Fig. 6 is a schematic diagram of a relationship curve between a control signal and a control voltage according to a fourth embodiment of the present invention. Referring to fig. 6, when the continuously varying control signals of 0 to +10V and 0 to-10V are input from the interface D and the interface E, the controller 10 can ensure that when the control signal is at +10V (or-10V), the output control voltage Ua (or control voltage Ub) is the same as the control voltage in the control signal-control voltage correlation established above, so as to control the amplifier U2 (or amplifier U1) to operate, so that the opening of the proportional directional valve is opened, and the flow output detected by the flow sensor is 100L/min, and similarly, when the control signal is at +2V (or-2V), the flow output detected by the flow sensor is 10L/min; meanwhile, the controller 10 converts the input 0- +2V, + 2V- +10V and the output control voltage Ua into a linear relationship, and converts the control signals of 0- +2V, -2V- +10V and the output control voltage Ub into a linear relationship; since the amplifier U1 and the amplifier U2 are proportional amplifiers, the control voltage Ua (or the control voltage Ub) is proportional to the current Ia (or the current Ib) output from the amplifier U2 (or the amplifier U1), and therefore, the control signals of 0 to +10V (or 0 to-10V) input from the interface D and the interface E, which continuously change, are linear to the current Ia (or the current Ib) output from the amplification module 20.
For example, fig. 7 is a schematic diagram of another control signal-control voltage relationship curve provided in the fourth embodiment of the present invention. Referring to fig. 7, the controller 10 converts the input control signals of 0 to +2V and +2V to +10V and the output control voltage Ua into a curve variation relationship, and simultaneously converts the input control signals of 0 to-2V and +2V to-10V and the output control voltage Ub into a curve variation relationship, so that the interface D and the interface E input continuously varying control commands of 0 to +10V (or 0 to-10V) and the current Ia (or the current Ib) output by the amplifying module 20 into a curve variation relationship.
For example, fig. 8 is a schematic diagram of another control signal-control voltage relationship curve provided in the fourth embodiment of the present invention. Referring to fig. 8, the controller 10 sets a plurality of input control finger signals, and makes the control signal of 0 to +10V and the output control voltage Ua have a multi-slope change relationship, and at the same time, makes the control signal of 0 to-10V and the output control voltage Ub have a multi-slope change relationship, so that the control command of 0 to +10V (or 0 to-10V) continuously changed and the current Ia (or current Ib) output by the amplifying module 20 are input to the interface D and the interface E and have a multi-slope change relationship, and the adjustment of four slope segments is illustrated in fig. 8, so as to meet the requirements of more diversified operating conditions.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (7)
1. A method of commissioning a control panel for a reversing valve, performed by a controller, the method comprising:
receiving an externally input control signal, and outputting an initial control voltage to an amplification module so that the amplification module adjusts the opening size of the proportional directional valve according to the control voltage; inputting a control signal-preset sensor signal association relation to a controller;
when a current sensor signal fed back by a sensor is the same as a preset sensor signal, acquiring a control voltage; wherein the current sensor signal is associated with an opening size of the proportional directional valve;
establishing a control signal-control voltage incidence relation;
generating a control signal-control voltage relation curve according to at least two groups of control signal-control voltage incidence relations;
when the current sensor signal fed back by the sensor is the same as the preset sensor signal, acquiring the control voltage comprises:
acquiring the current sensor signal fed back by a sensor;
correcting the control voltage according to the preset sensor signal, the current sensor signal and the current control voltage, so that the amplification module adjusts the opening size of the proportional reversing valve according to the corrected control voltage;
repeatedly executing the steps until the current sensor signal is the same as the preset sensor signal;
acquiring the control voltage;
the correcting the control voltage according to the preset sensor signal, the current sensor signal and the current control voltage comprises:
obtaining a correction signal through proportional integral derivative control according to the preset sensor signal and the current sensor signal;
and correcting the control voltage according to the correction signal and the current control voltage.
2. The method of debugging a control board of a reversing valve according to claim 1, wherein said generating the control signal-control voltage relationship curve according to at least two sets of the control signal-control voltage relationships comprises:
and generating a control signal-control voltage relation curve by linear fitting according to at least two groups of control signal-control voltage incidence relations.
3. The method of debugging a control board of a reversing valve according to claim 1, wherein said generating the control signal-control voltage relationship curve according to at least two sets of the control signal-control voltage relationships comprises:
and according to at least two groups of control signal-control voltage incidence relations, curve fitting is carried out to generate a control signal-control voltage relation curve.
4. The method of debugging a control board of a reversing valve according to claim 1, wherein said generating the control signal-control voltage relationship curve according to at least two sets of the control signal-control voltage relationships comprises:
and according to at least two groups of control signal-control voltage incidence relations, piecewise linear fitting is carried out to generate a broken line type control signal-control voltage relation curve.
5. The method of commissioning a reversing valve control panel of claim 1, wherein said sensor comprises a flow sensor or a displacement sensor.
6. A directional valve control plate, comprising: the device comprises a differential amplifier, a buffer generator, a controller, an amplifying module and a proportional reversing valve;
the differential amplifier is connected with the buffer generator and is used for receiving and amplifying a control signal;
the buffer generator is connected with the controller and is used for carrying out ramp processing on the control signal;
the amplification module is connected with the controller and used for controlling the opening size of the proportional reversing valve according to the control voltage sent by the controller;
when executed by the controller, the one or more programs cause the controller to implement the proportional directional valve testing method of any of claims 1-5.
7. The reversing valve control plate of claim 6, further comprising a sensor interface and a parameter input interface;
the sensor interface is connected with the controller and used for receiving a current sensor signal fed back by the sensor; the parameter input interface is connected with the controller and used for receiving an externally input control signal-preset sensor signal incidence relation.
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