CN218413261U - Dual-redundancy feedback control system - Google Patents
Dual-redundancy feedback control system Download PDFInfo
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- CN218413261U CN218413261U CN202222690717.6U CN202222690717U CN218413261U CN 218413261 U CN218413261 U CN 218413261U CN 202222690717 U CN202222690717 U CN 202222690717U CN 218413261 U CN218413261 U CN 218413261U
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Abstract
The application provides a dual redundant feedback control system, includes: the servo oil cylinder is used for driving a load to work; the input end of the first sensor is connected to the servo oil cylinder and used for collecting a first position signal of a load; the input end of the second sensor is connected to the servo oil cylinder and used for collecting a second position signal of the load; the output end of the servo valve is connected with the servo oil cylinder and used for controlling the working state of the servo oil cylinder; the output end of the dual-redundancy feedback control device is connected with the servo valve, and the input end of the dual-redundancy feedback control device is connected with the first sensor and the second sensor and used for receiving a first position signal of the first sensor and/or a second position signal of the second sensor and controlling the servo valve based on the first position signal or the second position signal and a given signal.
Description
The application has application number 202122545419.3, and the invention creates priority for application named dual redundant feedback control device and system.
Technical Field
The application relates to the technical field of feedback control, in particular to a dual-redundancy feedback control system.
Background
The electro-hydraulic servo control device is widely applied to control of the angle of the stationary blade of the axial flow fan in the steel mill. In the use process, feedback signals caused by sensor faults, signal isolator faults or position signal feedback loop faults and the like are lost frequently, so that the problems that an electrohydraulic servo control system affects production and causes serious loss due to the fact that the electrohydraulic servo control system is unstable in opening and closing of the inlet area of the fan and the control of the fan are caused. The conventional electro-hydraulic servo control system usually adopts a single sensor to acquire feedback position information of the opening degree of the stationary blade of the fan, and once the feedback position information is in a problem, a shutdown accident can be caused, so that the servo control system cannot normally operate and a large amount of resources are wasted.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present application is directed to a dual redundant feedback control system to solve the above problems.
In view of the above, the present application provides a dual redundant feedback control system, comprising:
the servo oil cylinder is used for driving a load to work;
the input end of the first sensor is connected to the servo oil cylinder and used for collecting a first position signal of a load;
the input end of the second sensor is connected to the servo oil cylinder and used for collecting a second position signal of the load;
the output end of the servo valve is connected with the servo oil cylinder and used for controlling the working state of the servo oil cylinder;
the output end of the dual-redundancy feedback control device is connected with the servo valve, and the input end of the dual-redundancy feedback control device is connected with the first sensor and the second sensor, and is used for receiving a first position signal of the first sensor and/or a second position signal of the second sensor and controlling the servo valve based on the first position signal or the second position signal and a given signal.
In some embodiments, the system further comprises: the hydraulic oil system is connected with the servo valve, the hydraulic oil pump is connected with the hydraulic oil system, and the hydraulic oil pump is connected with the hydraulic oil system and is used for supplying power oil to the servo valve and the servo oil cylinder.
In some embodiments, the dual redundant feedback control arrangement comprises:
a case for providing an accommodating space;
the mounting frame is arranged on one side of the case and used for fixing the case in an area to be mounted;
the control panel is arranged on one side of the case and used for realizing human-computer interaction;
the control unit is connected with the control panel, is arranged in the case and is used for generating an initial driving signal for driving the servo valve according to the first position signal or the second position signal and the given signal;
and the signal conditioning board is connected with the control unit, arranged in the case and used for processing the initial driving signal and generating a servo valve driving signal to drive the servo valve.
In some embodiments, the control unit includes a proportional-integral-derivative processing circuit and an amplifying circuit.
In some embodiments, the signal conditioning board comprises: the device comprises a control signal input circuit, a signal isolation conditioning circuit, a primary amplifying circuit, a gain adjusting circuit, a self-oscillation elimination compensating circuit, a test vector generating circuit, a characteristic analyzing circuit, a push-pull complementary circuit and a U/I conversion output circuit which are connected in sequence.
In some embodiments, the signal conditioning board further comprises: a zero point adjusting circuit connected with the first-stage amplifying circuit, and a measuring range adjusting circuit connected with the test vector generating circuit.
In some embodiments, the signal conditioning board comprises: the alarm circuit comprises one or more of an instruction loss alarm circuit, a feedback loss alarm circuit and a tracking loss alarm circuit;
the instruction loss alarm circuit is used for carrying out first alarm when the given signal is not detected;
the feedback loss alarm circuit is used for carrying out second alarm when the first position information is not detected or carrying out third alarm when the second position information is not detected;
the tracking loss alarm circuit is used for giving a fourth alarm when the dual-redundancy feedback control device is not detected to send a position tracking signal to the upper computer, wherein the position tracking signal is generated by the dual-redundancy feedback control device based on the received first position signal or the second position signal.
In some embodiments, the control panel is a touch control panel.
In some embodiments, the control panel comprises:
the system comprises a local instruction input frame, a local instruction adjusting button and a local instruction display frame, wherein a user sets a corresponding local instruction in the local instruction input frame based on the local instruction adjusting button;
a remote instruction display box for displaying the current value and the current percentage of the given signal set by a remote manner;
the first position feedback area is used for displaying a first current signal corresponding to a first position signal of a load collected by the first sensor;
the second position feedback area is used for displaying a second current signal corresponding to a second position signal of the load collected by the second sensor;
and the state display area is used for displaying a local/remote control switching button and current control state information, and the current control state information comprises remote or local.
In some embodiments, the back of the case is provided with an interface for connecting a power supply.
From the above, it can be seen that, in the dual-redundancy feedback control system provided by the application, the first sensor and the second sensor are arranged in the drive control system of the servo oil cylinder and are redundant with each other, when one of the sensors cannot normally acquire a position signal of a load due to some reasons, the other sensor can still normally send the acquired position signal to the dual-redundancy feedback control device to maintain normal control over the servo valve, so that the servo oil cylinder can normally drive the load, and the reliability and the safety of the whole load drive control system are improved.
Drawings
In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for the embodiments or related technologies in the following description are briefly introduced, and it is obvious that the drawings in the following description are only the embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a dual redundant feedback control system according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a dual redundant feedback control device according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a control panel according to an embodiment of the present disclosure.
Fig. 4 is a schematic diagram of a signal conditioning board according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to the accompanying drawings in combination with specific embodiments.
It should be noted that technical terms or scientific terms used in the embodiments of the present application should have a general meaning as understood by those having ordinary skill in the art to which the present application belongs, unless otherwise defined. The use of "first," "second," and similar terms in the embodiments of the present application is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
The existing servo control device usually adopts a single closed loop servo control mode, and when the problems of feedback signal loss, distortion or deletion and the like occur due to various working conditions, the machine can only be stopped for maintenance, so that the production is influenced, and the waste of time and resources is caused. Therefore, it is difficult for the conventional servo control device to satisfy the requirements of reliability and safety. Therefore, how to improve the control stability and safety of the servo control device becomes a technical problem which needs to be solved urgently.
In view of this, one or more embodiments of the present application provide a dual redundant feedback control system, which sets sensors in a redundant manner, so that when a feedback signal fails, the system can still support the loads such as the fan vanes to continue working, thereby improving the working performance of the loads and improving the reliability and safety. For the condition that the load is the fan stationary blade, the reliability and the stability of the axial flow fan stationary blade can be improved.
Referring to fig. 1, fig. 1 shows a schematic diagram of a dual redundant feedback control system according to an embodiment of the present application. In fig. 1, a dual redundant feedback control system 100 includes:
the servo oil cylinder 130 is used for driving a load to work;
the input end of the first sensor 110 is connected to the servo cylinder 130, and is used for collecting a first position signal of a load;
the input end of the second sensor 120 is connected to the servo cylinder 130, and is used for collecting a second position signal of the load;
the output end of the servo valve 140 is connected with the servo cylinder 130 and is used for controlling the working state of the servo cylinder 130;
a dual redundant feedback control device 150, an output of the dual redundant feedback control device 150 is connected to the servo valve 140, and an input of the dual redundant feedback control device 150 is connected to the first sensor 110 and the second sensor 120, for receiving the first position signal of the first sensor 110 and/or the second position signal of the second sensor 120, and controlling the servo valve 140 based on the first position signal or the second position signal, the given signal.
In some embodiments, the given signal may be sent by a Distributed Control System (DCS) to the dual redundant feedback Control device 150. Further, in some embodiments, the dual redundant feedback control device 150 may further generate a corresponding position indication signal based on the received first position signal or the second position signal, and transmit the corresponding position indication signal to the distributed control system DCS. Wherein the position indication signal may be used to track the first position signal or the first position signal to indicate whether the dual redundant feedback control device 150 is able to normally receive the position signal of the load.
In some embodiments, the dual redundant feedback control device 150 receiving the first position signal of the first sensor 110 and the second position signal of the second sensor 120 and controlling the servo valve 140 based on the first position signal or the second position signal and the given signal may further include:
when the first position signal is missing, dual redundant feedback control 150 receives the second position signal and controls the servo valve based on the second position signal and the given signal;
or the like, or, alternatively,
when the second position signal is missing, dual redundant feedback control 150 receives the first position signal and controls the servo valve based on the first position signal and the given signal.
When one sensor cannot normally acquire a position signal of a load (such as stationary blade opening degree) due to some reasons, the other sensor still can normally send the acquired position signal to a dual-redundancy feedback control device to maintain normal control of a servo valve, so that a servo oil cylinder can normally drive the stationary blade of the fan, and the reliability and the safety of the whole stationary blade driving control system of the fan are improved.
In some embodiments, the first sensor 110 or the second sensor 120 may be a position sensor.
In some embodiments, the load may include vane opening. Such as an axial compressor.
Specifically, the first and second sensors 110 and 120 may measure actual position signals of the vane opening, convert them into corresponding first and second position signals, and send to the dual redundant feedback control device 150. The dual redundant feedback control device 150 may further receive a given signal from an upper computer (e.g., distributed control system DCS), and the dual redundant feedback control device 150 may generate a driving current signal of the servo valve after performing proportional-integral-derivative (PID) processing and amplification processing on a difference between the given signal and the first position signal (or the second position signal). The driving current signal is input to the servo valve, the servo valve drives the servo oil cylinder to work based on the driving circuit signal, and the servo oil cylinder drives the opening of the static blade to reach an expected position, so that servo driving of the opening of the static blade is achieved. When the first sensor 110 is not abnormal, the dual-redundancy feedback control device 150 performs PID processing and amplification processing on a difference value between the first position signal and the given signal, and once the first sensor is abnormal, the dual-redundancy feedback control device 150 is switched to receive the second position signal of the second sensor 120, so that normal work of servo driving of the opening of the stator blade can still be guaranteed, and when the problems of loss, distortion or deletion of the feedback signal and the like are avoided, the machine can only be stopped for maintenance, so that a work task is delayed, and time and resources are wasted.
In some embodiments, the servo valve 140 may also be connected to a hydraulic oil system 160 and a hydraulic oil pump 170, and the hydraulic oil system 160 provides a power source for the servo valve 140. The hydraulic oil pump 170 is a hydraulic component for providing pressurized liquid for hydraulic transmission, and the hydraulic oil pump 170 converts mechanical energy of a power machine (such as an electric motor, an internal combustion engine and the like) into pressure energy of the liquid; the hydraulic oil system 160 supplies power oil to the servo valve 140 and the servo cylinder 130.
In some embodiments, the dual redundant feedback control device 150 may further comprise:
a cabinet 151 for providing an accommodating space;
a mounting bracket 152 disposed at one side of the cabinet 151 for fixing the cabinet 151 to an area to be installed;
a control panel 153 arranged at one side of the case 152 for realizing human-computer interaction;
a control unit 154 connected to the control panel 153, disposed inside the casing 110, for generating an initial driving signal for driving the servo valve 140 according to the first position signal or the second position signal, and the given signal;
and a signal conditioning board 155 connected to the control unit 154, disposed inside the casing 110, and configured to perform signal processing on the initial driving signal and generate a servo valve driving signal to drive the servo valve 140.
Specifically, referring to fig. 2, fig. 2 shows a schematic structural diagram of a dual redundant feedback control device according to an embodiment of the present disclosure. In fig. 2, a control panel 153 may be installed on the front surface of the housing 151 and connected to the control unit 154. The control panel 153 is used for realizing human-computer interaction of the dual-redundancy feedback control system, a user can input setting parameters to the dual-redundancy feedback control system through the control panel 153, and correspondingly, the control panel 153 can also display the working state of the dual-redundancy feedback control system, and the receiving, processing and transmitting conditions of all signals to the user.
In some embodiments, the control panel can provide display of all signals and status and all control functions and setup functions, and can display instructions, feedback, channels, signal status, etc. information during control. In some embodiments, the control panel is further provided with a switching button; the switch button is used to manually send a switch signal to an input of the control unit 154. In some embodiments, the control panel is a touch control panel.
Specifically, referring to fig. 3, fig. 3 shows a schematic diagram of a control panel according to an embodiment of the present disclosure. In fig. 3, the control panel 153 may include a local instruction region 1531, a remote instruction region 1532, a first position feedback region 1533, a second position feedback region 1534, and a status display region 1535. The local command area 1531 may include a local command input box, a local command adjustment button, and a local command display box, and the user may set a corresponding local command in the local command input box based on the local command adjustment button (e.g., an increment button and a decrement button), for example, if a current value of a signal is given, the set current value may be displayed in the local command display box. The remote command area 1532 may include a remote command display box that allows the user to set the current value and current percentage of a given signal remotely. The first position feedback region 1533 may display a first current signal, such as a current value and a current percentage, corresponding to a first position signal of the vane opening collected by the first sensor 110. The second position feedback region 1534 may display a second current signal, such as a current value and a current percentage, corresponding to a second position signal of the vane opening collected by the second sensor 120. The status display area 1535 may display a local/remote control switching button and current control status information. The current control state information may display the control state as "remote" or "local" in real time. And a deviation signal percentage display frame and a servo valve current value display frame are arranged below the local remote switching button. The status display area 1535 may also display status of instruction lost, feedback lost (primary), feedback lost (backup), alarm indication of tracking lost (red after signal loss), etc. The top right corner of the top menu bar in the control panel 153 is a BACK start home button BACK, which is clicked to return to the previous menu. A standby sensor (e.g., a second sensor) to main sensor (e.g., a first sensor) button may also be provided at the control panel 153. The control panel 153 may also include setting buttons for setting operational parameters. Such as range calibration, position indication calibration, alarm setting, positive and negative effect setting, PID parameter setting, etc. Wherein the current value is in mA units and the percentage is from zero to one hundred percent, i.e. 4mA for 0% and 20mA for 100%.
In some embodiments, the control unit 154 may include a proportional-integral-derivative processing circuit and an amplifying circuit.
Specifically, the control unit 154 is installed in the chassis, and its input terminals are respectively connected to the control panel 153, the first sensor 110 and the second sensor 120, and receive a setting signal of the control panel 153, a first position signal of the first sensor 110 and a second position signal of the second sensor 120; the output terminal of the control unit 154 is connected to the signal conditioning board 155, and sends an output signal to the signal conditioning board 155. In this embodiment, the input terminals of the control unit 154 respectively receive three signals: a setting signal of the control panel 153, a first position signal of the first sensor 110, and a second position signal of the second sensor 120; wherein the setting parameters of the control panel 153 are used to set the control unit 154 to process the first position signal of the first sensor 110 and the second position signal of the second sensor 120, and to set a processing strategy when an equipment failure occurs. Under normal operating conditions, the first position signal and the second position signal are maintained within a certain error range. In the case that the first sensor is not abnormal, the control unit 154 only needs to process the first position signal and send an output signal to the signal conditioning board 155, and the second position signal may be stored as backup data only and is not processed; under the condition that the first sensor is abnormal, the control unit 154 can switch to process the second position signal to complete the function of sending the output signal to the signal conditioning board 155, so that the problem that the machine is usually only stopped for maintenance when the feedback signal is lost, distorted or missing is solved, the work task is delayed, and the waste of time and resources is caused.
In some embodiments, referring to fig. 4, fig. 4 shows a schematic diagram of a signal conditioning board according to an embodiment of the present disclosure. In fig. 4, the signal conditioning board 155 can perform I/U conversion, isolation conditioning, adjustment for increasing zero gain and full scale, and signal linearization compensation, signal characteristic identification and U/I conversion functions on the driving signal output by the control unit 154. The signal conditioning board 155 may include: the device comprises a control signal input circuit 1551, a signal isolation conditioning circuit 1552, a primary amplification circuit 1553, a gain adjusting circuit 1554, a self-oscillation elimination compensation circuit 1555, a test vector generation circuit 1556, a characteristic analysis circuit 1557, a push-pull complementary circuit 1558 and a U/I conversion output circuit which are connected in sequence. Further, the signal conditioning board 155 may further include: a zero point adjusting circuit 1558 and a range adjusting circuit 1559.
Specifically, the signal conditioning board 155 may be installed in the chassis, an input end of the signal conditioning board 155 is connected to an output end of the control unit 154, and an output signal of the control unit 154 is processed and then output to the servo valve 140. Because the output signal of the control unit 154 often cannot be directly output to the servo valve 140 to complete feedback control, and the data types of the output signal and the servo valve 140 cannot be directly matched, the output signal of the control unit 154 needs to be converted and amplified by the signal conditioning board 155 to obtain a converted output signal matched with the servo valve 140.
In practical applications, the dual redundant feedback control device 150 may set the related automatic protection operations on the signal conditioning board 155 according to the actual requirements on the site after the first position signal, i.e. the position feedback signal, of the first sensor 110 (i.e. the main sensor) is lost and an alarm is given according to the setting of the signal conditioning board 155. The signal conditioning board 155 is selectively set to "loss of the main sensor position feedback signal", and may select operations such as "holding the servo valve", "locking the servo valve", "losing memory of feedback", and "switching the backup sensor". The dual redundant feedback control device 150 may also implement a "servo valve hold" function, e.g., the dual redundant feedback control device 150 controls a signal that the servo valve 140 is in a null position after the feedback signal is lost. The dual redundant feedback control device 150 may also implement "feedback loss memory," for example, after the feedback signal is lost, the dual redundant feedback control device 150 may automatically output the servo valve driving current 1 second (default) before the loss, and at this time, it is ensured that the servo valve 140 has no flow output. The dual redundant feedback control device 150 can also implement a "servo valve locking" function, for example, a locking control function implemented in cooperation with an on-site hydraulic protection device, and the locking signal is controlled by a 24V switching value. The dual redundant feedback control device 150 can also implement "switch the second sensor (i.e. the standby sensor)", for example, when the main feedback signal is lost or is lower than the set value, the first position signal is automatically switched to the second position signal, the switching time is shortest to 1ms, the undisturbed switching of the system is ensured, and the safety and stability of the system operation are ensured.
In some embodiments, the signal conditioning board 155 may further include:
and the alarm circuit comprises one or more of an instruction loss alarm circuit, a feedback loss alarm circuit and a tracking loss alarm circuit.
Further, in some embodiments, the instruction loss alarm circuit is configured to raise a first alarm when the given signal is not detected.
Further, in some embodiments, the feedback loss alarm circuit is configured to perform a second alarm when the first position information is not detected, or perform a third alarm when the second position information is not detected.
Further, in some embodiments, the tracking loss alarm circuit is configured to perform a fourth alarm when the dual-redundancy feedback control device does not detect a position tracking signal sent to an upper computer, where the position tracking signal is generated by the dual-redundancy feedback control device based on the received first position signal or the second position signal.
The signal conditioning board 155 can recognize an abnormality of the output signal and provide an abnormality alarm, among other things. When the instruction is lost, the feedback is lost, the tracking is lost, and the like, the alarm circuit of the signal conditioning board 155 respectively sends out corresponding prompts. For example, instructions may be alerted in a first alert form when lost, feedback may be alerted in a second alert form when lost, and tracking may be alerted in a third alert form when lost. The different alarm forms can be different colors of indicator lights, different flashing combinations of the indicator lights, and the like.
In some embodiments, the mounting bracket may be installed at a side of the chassis, on the same horizontal plane as the control panel, and the mounting bracket is provided with a plurality of through holes for passing the screws.
In some embodiments, the back of the chassis is provided with an interface for connecting a power supply.
In some embodiments, chassis 151 may be an aluminum alloy frame.
Specifically, the dual-redundancy feedback control device 150 is often installed in a standard cabinet adapted to the dual-redundancy feedback control device when in use, and the mounting rack is installed on the side surface of the cabinet and on the same horizontal plane with the control panel, so that the cabinet of the dual-redundancy feedback control system of the present application is installed in the standard cabinet, and the plane of the control panel after installation is horizontal to the front surface of the standard cabinet, thereby facilitating the use of operators. The controller can be installed in a main control room on a working site, the controller is required to be installed in a standard cabinet when the controller is installed on the site, a user can customize the cabinet or a fixing frame according to the size of the mounting frame, and the user can also detach the mounting frame to place the mounting frame at a proper position when necessary.
In some embodiments, the back of the case is provided with a plurality of signal ports for connecting the input end of the control unit and the output ends of the first sensor and the second sensor, and connecting the output end of the signal conditioning board and the input end of the servo device. In some embodiments, the number of signal ports is no less than 14.
Specifically, the input end of the control unit and the output end of the signal conditioning board are communicated with external equipment through a signal port on the back of the case, and in a mode that the signal port is fixedly arranged on the back of the case, when the control unit is connected with the external equipment, the disordered wiring does not need to be found, so that the line connection of the dual-redundancy feedback control system is more compact and orderly.
It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the context of the present application, features from the above embodiments or from different embodiments may also be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of brevity.
The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present application are intended to be included within the scope of the present application.
Claims (10)
1. A dual redundant feedback control system, comprising:
the servo oil cylinder is used for driving a load to work;
the input end of the first sensor is connected to the servo oil cylinder and used for collecting a first position signal of a load;
the input end of the second sensor is connected to the servo oil cylinder and used for collecting a second position signal of the load;
the output end of the servo valve is connected with the servo oil cylinder and used for controlling the working state of the servo oil cylinder;
the output end of the dual-redundancy feedback control device is connected with the servo valve, and the input end of the dual-redundancy feedback control device is connected with the first sensor and the second sensor, and is used for receiving a first position signal of the first sensor and/or a second position signal of the second sensor and controlling the servo valve based on the first position signal or the second position signal and a given signal.
2. The system of claim 1, further comprising: the hydraulic oil system is connected with the servo valve, the hydraulic oil pump is connected with the hydraulic oil system, and the hydraulic oil pump is used for supplying power oil to the servo valve and the servo oil cylinder through the hydraulic oil system.
3. The system of claim 1, wherein the dual redundant feedback control arrangement comprises:
a case for providing an accommodating space;
the mounting frame is arranged on one side of the case and used for fixing the case in an area to be mounted;
the control panel is arranged on one side of the case and used for realizing human-computer interaction;
the control unit is connected with the control panel, arranged in the case and used for generating an initial driving signal for driving the servo valve according to the first position signal or the second position signal and the given signal;
and the signal conditioning board is connected with the control unit, arranged in the case and used for processing the initial driving signal and generating a servo valve driving signal to drive the servo valve.
4. The system of claim 3, wherein the control unit comprises a proportional-integral-derivative processing circuit and an amplification circuit.
5. The system of claim 3, wherein the signal conditioning board comprises: the device comprises a control signal input circuit, a signal isolation conditioning circuit, a primary amplifying circuit, a gain adjusting circuit, a self-oscillation elimination compensating circuit, a test vector generating circuit, a characteristic analyzing circuit, a push-pull complementary circuit and a U/I conversion output circuit which are connected in sequence.
6. The system of claim 5, wherein the signal conditioning board further comprises: a zero point adjusting circuit connected with the first-stage amplifying circuit, and a measuring range adjusting circuit connected with the test vector generating circuit.
7. The system of claim 1, wherein the signal conditioning board comprises: the alarm circuit comprises one or more of an instruction loss alarm circuit, a feedback loss alarm circuit and a tracking loss alarm circuit;
the instruction loss alarm circuit is used for carrying out first alarm when the given signal is not detected;
the feedback loss alarm circuit is used for carrying out second alarm when the first position signal is not detected or carrying out third alarm when the second position signal is not detected;
the tracking loss alarm circuit is used for giving a fourth alarm when the position tracking signal sent by the dual-redundancy feedback control device to the upper computer is not detected, and the position tracking signal is generated by the dual-redundancy feedback control device based on the received first position signal or the second position signal.
8. The system of claim 3, wherein the control panel is a touch control panel.
9. The system of claim 8, wherein the control panel comprises:
the system comprises a local instruction input frame, a local instruction adjusting button and a local instruction display frame, wherein a user sets a corresponding local instruction in the local instruction input frame based on the local instruction adjusting button;
a remote instruction display box for displaying the current value and the current percentage of the given signal set by a remote manner;
the first position feedback area is used for displaying a first current signal corresponding to a first position signal of a load collected by the first sensor;
the second position feedback area is used for displaying a second current signal corresponding to a second position signal of the load collected by the second sensor;
and the state display area is used for displaying a local/remote control switching button and current control state information, and the current control state information comprises remote or local.
10. The system of claim 3, wherein the back of the housing is provided with an interface for connecting to a power source.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202122545419 | 2021-10-21 | ||
| CN2021225454193 | 2021-10-21 |
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| CN218413261U true CN218413261U (en) | 2023-01-31 |
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| CN202222690717.6U Active CN218413261U (en) | 2021-10-21 | 2022-10-12 | Dual-redundancy feedback control system |
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