CN212083958U - Double-feedback proportional valve controller - Google Patents
Double-feedback proportional valve controller Download PDFInfo
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- CN212083958U CN212083958U CN202021153061.9U CN202021153061U CN212083958U CN 212083958 U CN212083958 U CN 212083958U CN 202021153061 U CN202021153061 U CN 202021153061U CN 212083958 U CN212083958 U CN 212083958U
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Abstract
The utility model discloses a double-feedback proportional valve controller, which comprises a control unit, a communication conversion circuit, a signal conditioning circuit, a power conversion circuit and an input/output interface module; the communication conversion circuit, the signal conditioning circuit, the power conversion circuit and the input/output interface module are all connected with the control unit; the communication conversion circuit can receive various upper computer signals to set parameters of the double-feedback proportional valve controller; the signal conditioning circuit receives an external voltage command signal, collects the displacement of the main valve core and the pilot valve core of the proportional valve and the current amount of the electromagnet, and the power conversion circuit receives a PWM command signal sent by the control unit, amplifies the power of the PWM signal and drives the proportional electromagnet. The utility model has the advantages of control accuracy is high, frequency response is fast, the driving force is strong, application scope is wide.
Description
Technical Field
The utility model relates to a proportional valve controller, especially a double feedback proportional valve controller.
Background
China is in a starting stage in the research aspect of high-end proportional valve controllers, has a larger gap in the aspects of control performance, reliability and the like compared with similar products abroad, and the market of the high-end proportional valve controllers in China is basically monopolized by well-known hydraulic component enterprises abroad at present. A double-feedback proportional valve controller with large flow, strong pollution resistance, high reliability and high economical efficiency is urgently needed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a two feedback proportional valve controller.
Realize the utility model discloses the technical scheme of purpose does: a double-feedback proportional valve controller comprises a control unit, a communication conversion circuit, a signal conditioning circuit, a power conversion circuit and an input/output interface module;
the communication conversion circuit, the signal conditioning circuit, the power conversion circuit and the input/output interface module are all connected with the control unit; the communication conversion circuit receives the signal of the upper computer to set the parameters of the double-feedback proportional valve controller; the signal conditioning circuit receives an external voltage command signal, collects the displacement of a main valve core and a pilot valve core of the proportional valve and the current amount of the electromagnet, and the power conversion circuit receives a PWM command signal sent by the control unit, amplifies the power of the PWM signal and drives the proportional electromagnet; the displacement of the main valve core and the pilot valve core is respectively measured by a main valve core position sensor and a pilot valve core position sensor and transmitted to a signal conditioning circuit.
Compared with the prior art, the beneficial effects of the utility model are that: (1) the double-feedback proportional valve controller is specially designed for controlling the two-stage proportional directional valve, can cooperatively control the two electromagnets to work, and adaptively outputs matching current; (2) the double-feedback proportional valve controller is provided with three remote communication interfaces; (3) the double-circuit power driving circuit has a synergistic effect, so that the driving capability of the controller is improved.
Drawings
FIG. 1 is a block diagram of a dual feedback proportional valve controller assembly.
FIG. 2 is a block diagram of the operating principle of a dual feedback proportional valve controller.
Fig. 3 is a power driving diagram.
Detailed Description
The utility model relates to a two feedback proportional valve controllers, control object are two-stage closed loop servo proportional valve, and its main valve core and pilot valve core all have displacement sensor, and proportional valve and controller cooperation work provide directional control and no pressure compensation's flow control according to the size of the input signal of telecommunication.
As shown in FIG. 1, the dual feedback proportional valve controller of the present invention comprises a control unit, a communication switching circuit, a signal conditioning circuit, a power switching circuit, and an input/output interface module.
The communication conversion circuit, the signal conditioning circuit, the power conversion circuit and the input/output interface module are all connected with the control unit; the communication conversion circuit can receive three communication signals to control the double-feedback proportional valve controller; the signal conditioning circuit receives an external voltage command signal, collects the displacement of a main valve core and a pilot valve core of the proportional valve and the current amount of the electromagnet, and the power conversion circuit receives a PWM command signal sent by the control unit, amplifies the power of the PWM signal and drives the proportional electromagnet; the displacement of the main valve core and the pilot valve core is respectively measured by a main valve core position sensor and a pilot valve core position sensor and transmitted to a signal conditioning circuit.
Furthermore, the control unit adopts a DSPIC30F3013-30I/SO type single chip microcomputer of Microchip company.
Furthermore, a DSPIC30F3013-30I/SO type single chip microcomputer adopts 5V power supply.
Furthermore, the communication conversion circuit adopts communication protocol chips SP3232EE of SIPEX company, and T1IN and R1OUT pins of the SP3232EE chip are connected with U1ATX and U1ART of the control unit.
Furthermore, the SP3232EE chip supplies +3.0V to + 5.5V.
Furthermore, the signal conditioning circuit can convert three paths of voltage signals of 0-10V into digital quantity signals and input the digital quantity signals into the control unit.
Further, the power conversion circuit is used for converting the 24V power supply into a +/-15V power supply and a +5V power supply.
Further, the power conversion circuit adopts a VRA _ YMD-6WR3 series DC/DC module.
Further, the power conversion circuit adopts a driving chip IR2301STRPBF, and the power conversion circuit adopts double-path driving cooperative control.
The double-feedback proportional valve controller is a core part of the double-feedback proportional valve and can receive remote signals through communication to control the controller. When the double-feedback proportional valve works, an external instruction signal (0 to +/-10V) is received to control a pilot valve electromagnet on the double-feedback proportional valve, so that the main valve element is controlled to act, and meanwhile, position feedback signals of the pilot valve and the main valve element are collected, so that the main valve element of the double-feedback proportional valve moves to a required position according to the control instruction.
The input end of the controller is provided with an external control signal and two paths of position feedback signals of the proportional valve, the internal part outputs a PWM signal to act on the electromagnet of the pilot valve by using an algorithm, and the position closed-loop control of the main valve is finally realized by electro-hydraulic conversion. Compared with the prior art, the utility model discloses control accuracy is high, the frequency response is fast, the suitability is good, the driving force is strong.
Compared with most of analog proportional valve control plates on the market, the double-feedback proportional valve controller adopts a full digital control mode, the control performance is changed, and the development direction of hydraulic system control is met. And on the circuit design of the direct-acting proportional valve controller, a digital communication mode is added, a working mode of the synergistic effect of the two-way driving circuit is provided, the power driving capability is improved, a control algorithm is broken through, and the control performance of the whole system is improved.
The present invention will be described in detail with reference to the following examples.
Examples
As shown in FIG. 1 and FIG. 2, the present invention provides a double feedback proportional valve controller, which satisfies the following technical criteria
(1) Supply voltage: the power electricity is 24 +/-1V;
(2) input-output signal requirements: the input signal is 0 to +/-10V, and the number of channels is 1; the output signal is current, the single channel is adjustable at 0-2.7A, and the number of the channels is 2;
(3) the system realizes RS232/RS485/CAN bus communication with an upper computer, and realizes parameter setting and state monitoring;
(4) realizing two-stage position closed-loop control of the pilot valve and the main valve;
(5) and sending two paths of PWM control signals to coordinate and control the proportional electromagnet.
The utility model adopts the following technical scheme for solving the technical problem.
And the double-feedback proportional valve controller responds to the control instruction to complete the real-time closed-loop control of the two-stage position loop of the pilot valve and the main valve of the double-feedback proportional valve, so that the main valve core of the double-feedback proportional valve moves to a required position according to the control instruction.
The double-feedback proportional valve controller adopts a controller technical scheme of two-ring digital control based on a digital controller. The block diagram of the components is shown in figure 1.
The double-feedback proportional valve controller mainly comprises 6 functional modules, namely an external signal input and output interface module, a control unit, a measurement feedback amplifying circuit module, a proportional valve driving module, a communication serial port communication module and a power supply module.
The external input and output signals comprise analog quantity signals and digital quantity signals. The analog input signal is realized by an ADC conversion interface of the control unit; the monitoring output signal is converted by the conditioning circuit; the power driving module is used for receiving a PWM command signal sent by the control unit and driving the proportional electromagnet according to requirements; the measurement feedback amplifying circuit realizes the acquisition and conditioning of two paths of closed-loop control feedback signals, and the receiving pilot valve and the main valve element displacement sensor signal are conditioned and then sent to the control unit to form position feedback double closed-loop control; the control unit completes the functions of signal acquisition, signal processing, PID regulation, control signal output and the like; the RS-232 serial port communication module realizes communication with an upper computer and parameter setting of the control unit; the power supply module is used for conditioning the voltage required by each module on the controller and supplying power to each functional module on the controller.
The working principle is as follows: before the proportional valve is used, the controller is connected with a 24V control power supply, and after the controller is conditioned, the power-on of each functional module, the initialization of the control unit and the self-inspection are completed. The controller receives the instruction of the upper computer through the communication bus to realize the setting of the control parameters of the controller.
After the parameters of the controller are set, when the controller receives an instruction signal, a control algorithm is executed, a PWM signal is generated, an internal power circuit is driven, power amplification and electromagnet energization are achieved, the valve core of the pilot valve of the double-feedback proportional valve is controlled to move towards a certain direction, and then the opening degree of the main valve core of the double-feedback proportional valve is controlled.
When the main valve core of the double-feedback proportional valve moves, the main valve core displacement sensor and the pilot valve displacement sensor output a main valve core position signal and a pilot valve core position signal in real time, the main valve core position signal and the pilot valve core position signal are fed back to a control unit of the controller through the measurement feedback amplifying circuit module, the current information of the pilot valve electromagnet of the double-feedback proportional valve is monitored in real time by the controller, the current information is fed back to the control unit in real time after being regulated, the control unit compares the two feedback signals with an instruction signal and generates a deviation signal through a control algorithm, the main valve core of the double-feedback proportional valve is controlled to change towards the direction that the absolute value of the deviation signal is reduced under the closed loop regulation of the double-feedback proportional valve, the main valve core of the double-feedback. And in the working process of the double-feedback proportional valve, when the current exceeds a designed value, protective measures are taken to avoid the damage of the controller.
Detailed design of solution
The controller is used as a control center of the double-feedback proportional valve, responds to a control command and completes real-time closed-loop control of the double-feedback proportional valve. Through functional division and combination, the controller mainly comprises five parts, namely a control unit, a communication conversion circuit, a signal conditioning circuit, a power conversion circuit and the like, and a block diagram is shown in figure 1.
The controller receives the instruction signal, respectively acquires the displacement of the main valve core of the double-feedback proportional valve, the displacement of the pilot valve core and the current quantity of the electromagnet of the pilot valve of the double-feedback proportional valve through the main valve core displacement sensor, the pilot valve core displacement sensor and the current detection circuit, and a two-loop closed-loop control algorithm of a position loop and a current loop of the double-feedback proportional valve generates a PWM control signal according to each state information; the driving circuit electrically isolates and amplifies power of the PWM signal; the power circuit energizes the electromagnet of the double-feedback proportional valve according to the driving signal, and then the main valve core of the double-feedback proportional valve is controlled to move.
Control unit
The control unit is a control center of the controller, and mainly completes the following functions:
the communication bus communication with an upper computer is realized;
obtaining feedback signals of the position of a main valve core and the position of a pilot valve core of the double-feedback proportional valve;
double closed loop control of two-stage position feedback of the double-feedback proportional valve is realized;
the PWM control signal is sent.
The control unit chip mainly completes communication, control algorithm calculation, digital signal processing and work of each submodule of the control circuit, and adopts a single chip microcomputer of a model dspic30F3013 of Microchip company.
The peripheral circuit diagram of the controller mainly comprises a power supply circuit, a reset circuit and a clock circuit. Designing a power-on reset circuit for the system, wherein the circuit is connected to an MCLR pin of the singlechip; an external active crystal oscillator is selected to provide a clock circuit for the singlechip.
(II) communication switching circuit
The upper computer can communicate with the controller through an RS-232/RS485 bus to realize the setting and state acquisition of control parameters, and communication protocol chips SP3232EE and SP3485EN-L of SIPEX company are selected.
(III) Signal Conditioning Circuit
In the control of the double-feedback proportional valve, an input signal is 0 to +/-10V, a feedback signal of a main valve element position sensor of the external double-feedback proportional valve is 0 to +/-5V, a feedback signal of a pilot valve element position sensor of the external double-feedback proportional valve is 4 to 20mA, current passing through an electromagnet of the pilot valve of the double-feedback proportional valve is detected and collected, and the analog quantity input voltage requirement of the control unit is not more than +5V, so that the analog signal needing to be collected is input to the control unit for operation processing after being converted to a proper range by the signal conditioning circuit.
In order to ensure that the common mode interference of input signals is reduced, the input signals adopt differential input, meanwhile, a filter circuit is adopted to reduce the influence of noise, four operational amplifiers can be selected for the circuit board volume, an MC33074ADG chip is adopted to supply power with +/-15V, and the working temperature is minus 40 ℃ to plus 85 ℃. The filtered signals are conditioned to a voltage range which can be received by the control unit through the signal conditioning circuit and then input into the control unit for operation processing, an amplifier LM2902D chip is adopted, the chip can be supplied with power at a single end (+3V to +32V) and at two ends (+ -1.5V to +/-16V), the scheme adopts the single-end power supply of +5V, the signals input into the control unit are not negative, the input interface of the control unit is protected, and the working temperature is-40 ℃ to +125 ℃.
For the acquisition of 4-20 mA current signals, a sampling resistor is added at the front end of a differential input circuit to convert the current signals into voltage signals, then the voltage signals are conditioned according to the circuit to a voltage range which can be received by a control unit, and then the voltage signals are input into the control unit for operation processing.
For the detection and collection of the electromagnet current of the double-feedback proportional valve pilot valve, a special current detection chip LT6105 of LINEAR company is selected for supplying power for 2.85V to 36V, and the working temperature is minus 40 ℃ to plus 125 ℃.
(IV) Power conversion Circuit
The power drive is the core part of the double-feedback proportional valve controller and directly influences the steady-state and dynamic performances and the working reliability of the double-feedback proportional valve controller. The dual feedback proportional valve controller requires that the power drive meet the following conditions: the coil of the proportional electromagnet of the pilot valve of the double-feedback proportional valve can be driven by outputting enough current; the static and dynamic characteristics are good; the output control current is stable enough to resist the interference of temperature and power supply voltage variation. The power drive is shown in figure 3. The controller realizes proportional electromagnet coil current control by carrying out synchronous PWM modulation on Ql and Q2; the current reduction speed is accelerated, and the number of power elements is twice that of single-tube modulation type power drive; the amplitude of the ripple current is large, and the ripple can be reduced by increasing the switching frequency.
The power driving chip selects a high-low side driving chip IR2301 of an IOR company, supplies power for 5-20V, has the working temperature of minus 40 ℃ to plus 150 ℃ and has the power of 1W. The power tube is selected from NTD5865NT4G of ON company, which has 60V withstand voltage and 40A current capability.
(V) Power supply switching circuit
The power supply conversion circuit is the guarantee of the normal operation of the whole hardware, the whole controller system is supplied with power by 24V, and the following power supplies are respectively required to be generated:
1) a +/-15V power supply for providing power for the internal conditioning circuit;
2) the +15V power supply is used for providing power for the MOS tube driving chip;
3) the +5V power supply is used for providing a direct current power supply for the communication chip and the internal conditioning circuit;
4) the high-voltage driving circuit is used for providing a 24V high-voltage guide power supply for the electromagnet;
(VI) input/output interface module
The controller program downloads the JTAG interface connector as a 6-pin header; the controller communication bus communication interface connector is a 2-way 4-pin ox horn seat; the interface connector of the controller and the displacement sensor is a 2-way 4-foot ox-horn seat; the interface connector of the controller and the proportional electromagnet is a 2-way 2-foot horn seat; the controller is a 10-foot ox-horn seat with an external signal interface connector.
Any combination of the above technical features of the embodiments may be performed, and for brevity, all possible combinations of the technical features in the above embodiments are not described, however, it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the spirit of the present application, and these are all within the protection scope of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A double-feedback proportional valve controller is characterized by comprising a control unit, a communication conversion circuit, a signal conditioning circuit, a power conversion circuit and an input/output interface module;
the communication conversion circuit, the signal conditioning circuit, the power conversion circuit and the input/output interface module are all connected with the control unit; the communication conversion circuit receives three remote signals to control the double-feedback proportional valve controller; the signal conditioning circuit receives an external voltage or current command signal, collects the displacement of a main valve core and a pilot valve core of the proportional valve and the current amount of the electromagnet, and the power conversion circuit receives a PWM command signal sent by the control unit, amplifies the power of the PWM signal and drives the proportional electromagnet; the displacement of the main valve core and the pilot valve core is measured by a main valve core position sensor and a pilot valve core position sensor respectively and transmitted to a signal conditioning circuit.
2. The dual feedback proportional valve controller of claim 1, wherein the control unit is a model number DSPIC30F3013-30I/SO single chip microcomputer from Microchip.
3. The dual feedback proportional valve controller of claim 2, wherein the model DSPIC30F3013-30I/SO single chip microcomputer is powered by 5V.
4. The dual feedback proportional valve controller of claim 1, wherein the communication conversion circuit is a communication protocol chip SP3232EE manufactured by SIPEX corporation, and the T1IN and R1OUT pins of the chip SP3232EE are connected to U1ATX and U1ARX of the control unit.
5. The dual-feedback proportional valve controller of claim 1, wherein the signal conditioning circuit converts three 0-10V voltage signals into digital signals and inputs the digital signals into the control unit.
6. The dual feedback proportional valve controller of claim 1, wherein the power conversion circuit is configured to convert a 24V power supply to a ± 15V power supply and a +5V power supply.
7. The dual feedback proportional valve controller of claim 6, wherein the power conversion circuit employs a VRA _ YMD-6WR3 series DC/DC module.
8. The dual feedback proportional valve controller of claim 1, wherein the power conversion circuit employs a driver chip IR2301 STRPBF.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021153061.9U CN212083958U (en) | 2020-06-20 | 2020-06-20 | Double-feedback proportional valve controller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021153061.9U CN212083958U (en) | 2020-06-20 | 2020-06-20 | Double-feedback proportional valve controller |
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| CN212083958U true CN212083958U (en) | 2020-12-04 |
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