Hydraulic control actuating mechanism redundancy control method and system based on Oval system

Abstract

The invention relates to the technical field of control systems, in particular to a hydraulic control actuating mechanism redundancy control method and system based on an OVATION system, and the method comprises the steps: adding at least one LVDT based on a single LVDT as a redundancy feedback signal; monitoring a feedback signal of each LVDT in real time; and performing fault judgment according to the feedback signals of the plurality of LVDTs. Safety and reliability of the system are improved through redundancy feedback and real-time monitoring, the method is characterized in that feedback signals are monitored and compared in real time through combination of a plurality of LVDTs and VP cards so as to judge the state and faults of the system, and in industrial application with high automation and strict safety requirements, the redundancy control method can effectively reduce the fault risk and improve the reliability of the system. And stable operation of equipment is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of control systems, and in particular to a redundant control method and system for a hydraulically controlled actuator based on an Ovation system. Background Art

[0002] LVDT (Linear Variable Differential Transformer) is a sensor used to measure displacement and is widely used in industrial automation, aerospace, automotive and other high-precision measurement fields.

[0003] There are many cases in domestic power plants where valves fail to control and cause unplanned shutdowns due to failures in hydraulic actuator feedback devices or control devices. Hydraulic actuator feedback devices are often in high temperature and vibration environments and are subjected to long-term stress operations. Metal parts are easily damaged by aging, which causes failures in the feedback device. Therefore, the present invention proposes a redundant control method for hydraulic actuators based on the Ovation system. Summary of the invention

[0004] In view of the stability problem of the above-mentioned prior art, the present invention is proposed.

[0005] Therefore, an object of the present invention is to provide a redundant control method for a hydraulically controlled actuator based on an Ovation system.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a redundant control method of a hydraulic actuator based on an Ovation system, comprising:

[0007] Add at least one LVDT as a redundant feedback signal based on a single LVDT;

[0008] Real-time monitoring of each LVDT's feedback signal;

[0009] Fault diagnosis is performed based on comparison of feedback signals from multiple LVDTs.

[0010] As a preferred solution of the redundant control method of hydraulic actuator based on Ovation system described in the present invention, adding at least one LVDT as a redundant feedback signal based on a single LVDT requires adding a corresponding number of VP cards.

[0011] As a preferred solution of the redundant control method of hydraulic actuator based on Ovation system of the present invention, the real-time monitoring of the feedback signal of each LVDT is to collect the feedback of LVDT through VP card.

[0012] As a preferred solution of the redundant control method of hydraulic actuator based on Ovation system of the present invention, the fault judgment based on comparing feedback signals of multiple LVDTs is performed by comparing whether feedback signals collected by multiple VP cards are the same.

[0013] The present invention also proposes a hydraulic actuator redundant control system based on the Ovation system, comprising at least two mutually redundant LVDTs; at least two mutually redundant VP cards; an actuator connected to the LVDT; and the LVDT is electrically connected to the VP card.

[0014] As a preferred solution of the redundant control system of hydraulic actuators based on the Ovation system of the present invention, it further includes a servo valve, and the servo valve is electrically connected to the VP card.

[0015] As a preferred solution of the redundant control system of the hydraulically controlled actuator based on the Ovation system of the present invention, the servo valve is used to control the hydraulic oil flow of the actuator.

[0016] As a preferred solution of the redundant control system of hydraulic actuators based on the Ovation system of the present invention, at least two of the LVDTs have the same stroke and linearity.

[0017] As a preferred solution of the redundant control system of hydraulic actuators based on the Ovation system of the present invention, it further includes a fixed bracket, and at least two of the LVDTs are mounted on the fixed bracket through a positioning structure.

[0018] As a preferred solution of the redundant control system of hydraulic actuators based on the Ovation system of the present invention, the installation gap between the LVDTs is at least 15 cm.

[0019] The beneficial effects of the present invention are as follows: the safety and reliability of the system are improved through redundant feedback and real-time monitoring. The characteristic of this method is that it utilizes the combination of multiple LVDTs and VP cards to monitor and compare feedback signals in real time to judge the system status and faults. In industrial applications with high automation and strict safety requirements, this redundant control method can effectively reduce the risk of failure and ensure the stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0021] Figure 1 It is a schematic diagram of the overall structure of the redundant control system of the hydraulically controlled actuator based on the Ovation system of the present invention.

[0022] Figure 2 Schematic diagram of the LVDT structure in the present invention.

[0023] Figure 3 Schematic diagram of LVDT installation method in the present invention. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0027] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0028] Example 1

[0029] This embodiment provides a redundant control method for a hydraulic actuator based on an Ovation system, comprising:

[0030] S1. Add at least one LVDT100 as a redundant feedback signal based on a single LVDT100;

[0031] Adding at least one LVDT 100 as a redundant feedback signal based on a single LVDT 100 requires adding a corresponding number of VP cards 200. There is at least one main LVDT 100 in the system, which is responsible for providing the main position information, and the additional redundant LVDT 100 provides additional feedback data.

[0032] S2, real-time monitoring of the feedback signal of each LVDT100;

[0033] The feedback signal of each LVDT 100 is monitored in real time by collecting the feedback of the LVDT 100 through the VP card 200 .

[0034] S3. Perform fault judgment based on comparison of feedback signals of multiple LVDTs 100.

[0035] Fault determination based on comparison of feedback signals of multiple LVDTs 100 is performed by comparing whether the feedback signals collected by multiple VP cards 200 are the same.

[0036] The safety and reliability of the system are improved through redundant feedback and real-time monitoring. The characteristic of this method is that it utilizes the combination of multiple LVDT100 and VP card 200 to monitor and compare the feedback signals in real time to judge the system status and faults. In highly automated and safety-critical industrial applications, this redundant control method can effectively reduce the risk of failure and ensure the stable operation of the equipment.

[0037] Example 2

[0038] Reference Figure 1 and Figure 2 This embodiment is different from the first embodiment in that: this embodiment also proposes a hydraulic actuator redundant control system based on the Ovation system, including at least two mutually redundant LVDT100; at least two mutually redundant VP cards 200; an actuator 300 connected to the LVDT100; and the LVDT100 is electrically connected to the VP card 200.

[0039] The LVDT 100 is used to convert the displacement data of the actuator 300 into an electrical signal and transmit it to the VP card 200. The two VP cards 200 are redundant. When one VP card 200 fails, the system can automatically switch to another spare VP card 200, thereby ensuring the continuity and stability of the control system.

[0040] The actuator 300 is an oil motor.

[0041] Specifically, the servo valve 400 is used to control the hydraulic oil flow of the oil motor. The main function of the servo valve 400 is to control the hydraulic oil flow of the oil motor, thereby achieving precise control of the oil motor. The servo valve 400 is composed of an electromagnet and a hydraulic amplifier. The electromagnet generates magnetic force according to the input electrical signal to push the valve core of the hydraulic amplifier to move, thereby changing the flow and direction of the hydraulic oil.

[0042] At least two LVDT100s have the same stroke and linearity. Because the two LVDT100s have the same stroke, and the two LVDT100s are connected to the piston rod of the hydraulic motor, the piston rod can drive the two LVDT100s to move synchronously when it moves. Therefore, the two LVDT100 feedback signals collected by the VP card 200 should be the same. When the two LVDT100 feedback signals are different, it indicates that a fault has occurred.

[0043] Through the above solution, the downtime problem caused by various faults can be effectively avoided, and the faults that can be avoided include VP card 200 fault, coil fault, and LVDT 100 fault.

[0044] The redundant VP card 200 adopts the automatic recovery ARM standby state logic. When the above conditions are triggered, it will detect that the 10th bit of the status point packaging point of the VP card 200 main card becomes 0, and the VP card 200 will be automatically switched to the standby card with good LVDT100 status in the logic. At this time, the original standby card becomes the main card and an alarm is sounded.

[0045] In addition, an alarm will be issued when any of the redundant VP cards 200 detects that the instruction and feedback deviation is greater than 5%, the delay is 10 seconds, and the delay time is adjustable online, or the LVDT100 feedback deviation of the two VP cards 200 is greater than 10%.

[0046] The rest of the structure is the same as that of Example 1.

[0047] Example 3

[0048] Reference Figure 3 This embodiment is different from the above embodiments in that it also includes a fixing bracket 500, and at least two LVDT100 are installed on the fixing bracket 500 through a positioning structure, wherein the position of the fixing bracket 500 is fixed, so that the LVDT100 can have a stable installation position.

[0049] Specifically, the installation gap L between the LVDTs 100 is at least 15 cm. This arrangement can prevent the secondary coils 101 and the primary coils 102 of the plurality of LVDTs 100 from influencing each other when the LVDTs 100 are working.

[0050] The rest of the structure is the same as that of Example 2.

[0051] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0052] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0053] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A redundant control method for hydraulic actuators based on an Ovation system, characterized in that: include, Adding at least one LVDT (100) as a redundant feedback signal based on a single LVDT (100); Real-time monitoring of feedback signals of each LVDT (100); Fault judgment is performed based on comparison of feedback signals from a plurality of LVDTs (100).

2. The redundant control method for hydraulic actuators based on the Ovation system according to claim 1, characterized in that: Adding at least one LVDT (100) as a redundant feedback signal based on a single LVDT (100) requires adding a corresponding number of VP cards (200).

3. The redundant control method for hydraulic actuators based on the Ovation system according to claim 1, characterized in that: The real-time monitoring of the feedback signal of each LVDT (100) is performed by collecting the feedback of the LVDT (100) through the VP card (200).

4. The redundant control method for hydraulic actuators based on the Ovation system according to claim 1, characterized in that: The fault judgment based on comparing the feedback signals of a plurality of LVDTs (100) is performed by comparing whether the feedback signals collected by a plurality of VP cards (200) are the same.

5. A redundant control system for hydraulic actuators based on the Ovation system, characterized in that: include, at least two mutually redundant LVDTs (100); At least two mutually redundant VP cards (200); An actuator (300) connected to the LVDT (100); The LVDT (100) is electrically connected to the VP card (200).

6. The redundant control system for hydraulic actuators based on the Ovation system according to claim 1 or 5, characterized in that: It also includes a servo valve (400), wherein the servo valve (400) is electrically connected to the VP card (200).

7. The redundant control system for hydraulic actuators based on the Ovation system according to claim 1 or 5, characterized in that: The servo valve (400) is used to control the hydraulic oil flow of the actuator (300).

8. The redundant control system for hydraulic actuators based on the Ovation system as claimed in claim 7, characterized in that: At least two of the LVDTs (100) have the same stroke and linearity.

9. The redundant control system for hydraulic actuators based on the Ovation system as claimed in claim 8, characterized in that: It also includes a fixed bracket (500), on which at least two LVDTs (100) are mounted via a positioning structure.

10. The redundant control system for hydraulic actuators based on the Ovation system as claimed in claim 9, characterized in that: The installation gap between the LVDTs (100) is at least 15 cm.

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