Multi-machine parallel connection constant pressure water supply control method and system based on communication control

Abstract

The invention provides a multi-machine parallel connection constant pressure water supply control method and system based on communication control. The method comprises the steps that whether the system has no fault and does not meet the shutdown condition or not is judged; if not, adopting an abnormal state processing mechanism; if yes, the host adopts PID control based on feedback pressure; judging whether the pipe network pressure is smaller than target pressure; if yes, the host runs to the maximum frequency, and the pump adding condition is judged; if not, the host runs to the pump reduction detection frequency, and the pump reduction condition is judged; when the pump adding condition or the pump reducing condition is met, the host determines the station address of the started or stopped slave pump according to an automatic rotation control algorithm; starting or stopping of the corresponding slave pump is controlled according to the station address of the slave pump; the running time of each slave machine is ensured to be uniform through an automatic rotation control algorithm, and the situation that part of slave pumps do not run for a long time is avoided; a processing mechanism for various abnormal conditions is realized according to the pipe network pressure, and the frequency converter and the motor are prevented from operating at low speed for a long time to influence the safety of equipment.

Description

Technical Field

[0001] The present invention relates to the field of control technology, and in particular to a method and system for controlling multi-machine parallel constant pressure water supply based on communication control. Background Art

[0002] In a small residential water supply system, water drawn from a deep underground well is usually transported to a special reservoir, and then pressurized to supply water to the high floors of the residential area through a water pump. There are generally several control schemes: The first scheme is that the water pump motor adopts auto-coupling step-down start, works at industrial frequency, and the outlet valve of the water pump adopts full-open valve, half-open valve and start-stop pump control method. The second scheme adopts variable frequency control.

[0003] In the frequency conversion control scheme: 11) One frequency converter controls multiple motors through a contactor, and realizes automatic rotation constant pressure water supply control of one-to-many frequency conversion switching based on feedback pressure. 12) Only one frequency converter controls one large motor, and realizes constant pressure water supply control based on feedback pressure. 13) Multiple frequency converters control multiple small motors, and all frequency converters use constant pressure water supply control with the same start and stop based on feedback pressure. There is also a one-master-multiple-slave method, where only the host receives the feedback pressure signal and uses PID control, and the slaves start and stop at the same time as the host, and the frequency is also the same as the host.

[0004] In the first option, the water pump motor starts and stops at the industrial frequency, the impact current is large, the pressure is controlled by the valve, the pressure fluctuates greatly, and the valve is constantly opened and closed, resulting in large mechanical wear, heavy maintenance work, and high power consumption.

[0005] In the second scheme, Scheme 11 is not suitable for small water supply systems; in Scheme 12, since there are peak and valley periods in the water supply of the community, a large frequency converter is used to control a large motor. The excitation current of the large motor is larger and consumes more energy. During the valley period, the frequency converter may run at a low speed for a long time, which will also cause certain damage to the frequency converter, motor and equipment. In Scheme 13, since multiple motors start and stop at the same time, when multiple motors are running at the same time, the excitation current will cause increased energy consumption. At the same time, since they start and stop at the same time, all motors will also run at a low speed for a long time, which will increase energy consumption and equipment loss, and the pressure control stability will be relatively poor. Summary of the invention

[0006] In view of this, the purpose of the present invention is to provide a multi-machine parallel constant pressure water supply control method and system based on communication control, the host can view the slave machine status in real time, adjust the control strategy in real time, and obtain the best control effect; the host collects feedback pressure to implement an automatic rotation control algorithm of add first and then subtract and add last and then subtract, to ensure that the running time of each slave machine is relatively uniform, to avoid the situation where some slave pumps are not running for a long time; according to the pipeline pressure feedback signal, a processing mechanism for various abnormal conditions is implemented, including water shortage, underpressure, overpressure, etc., as well as a built-in sleep function, to avoid the inverter and motor running at low speed for a long time, affecting the safety of the equipment.

[0007] In a first aspect, an embodiment of the present invention provides a multi-machine parallel constant pressure water supply control method based on communication control, the method comprising:

[0008] Determine whether the system has no faults and does not meet the shutdown conditions;

[0009] If not, the abnormal state handling mechanism is adopted;

[0010] If yes, the host uses PID control based on the feedback pressure;

[0011] Determine whether the pipe network pressure is less than the target pressure;

[0012] If yes, the host is operated to the maximum frequency and the pump adding condition is determined;

[0013] If not, the host is operated to the pump reduction detection frequency, and the pump reduction condition is determined;

[0014] When the pump adding condition or the pump reducing condition is met, the host determines the station address of the slave pump to be started or stopped according to the automatic rotation control algorithm;

[0015] The start or stop of the corresponding slave pump is controlled according to the station address of the slave pump.

[0016] Furthermore, the abnormal state processing mechanism is implemented in the following manner:

[0017] Determine whether the host has a fault;

[0018] If yes, the system shuts down;

[0019] If not, the communication patrol will inquire whether there is a fault in the slave;

[0020] If so, the faulty slave is removed from the rotation sequence;

[0021] If not, query a slave without fault, and if the slave without fault does not exist in the rotation sequence, add the slave without fault to the rotation sequence;

[0022] Determining whether the pipe network pressure is less than the target pressure;

[0023] If yes, then the undervoltage state handling mechanism and water shortage handling logic are adopted;

[0024] If not, the overpressure state handling mechanism and sleep handling logic are adopted.

[0025] Furthermore, an undervoltage state processing mechanism and water shortage processing logic are adopted, including:

[0026] When the feedback pressure is less than the undervoltage protection setting value, the first duration reaches the undervoltage protection detection time;

[0027] Determine whether the undervoltage condition is valid;

[0028] If yes, the undervoltage signal output indication;

[0029] If not, the water shortage handling logic is adopted.

[0030] Furthermore, the water shortage processing logic is implemented in the following manner:

[0031] When both the master and slave pumps are running at full frequency, the pipe network pressure is less than the water shortage detection pressure and the second duration reaches the water shortage detection time;

[0032] Determine whether water shortage conditions are met;

[0033] If not, the system operates;

[0034] If yes, the system shuts down, and the host and the slave all shut down;

[0035] When the feedback pressure is greater than the water shortage detection pressure, the third duration reaches the water shortage automatic restart detection time;

[0036] Determine whether the water shortage restart condition is met;

[0037] If yes, then the system operates.

[0038] Furthermore, an overpressure state processing mechanism and a sleep processing logic are adopted, including:

[0039] When the feedback pressure is greater than the overpressure protection setting value, the fourth duration reaches the overpressure protection detection time;

[0040] Determine whether the overpressure condition is in effect;

[0041] If yes, then the overpressure signal output indication;

[0042] If not, the sleep processing logic is adopted.

[0043] Furthermore, the sleep processing logic is implemented in the following manner:

[0044] When the host frequency is less than the sleep frequency and the feedback pressure is greater than the sleep detection pressure, the fifth duration reaches the sleep detection time;

[0045] Determine whether the sleep conditions are met;

[0046] If not, the system operates;

[0047] If yes, the system is shut down, and the slave is in a shut down state;

[0048] When the feedback pressure is less than the sleep-wake-up detection pressure, the sixth duration reaches the sleep-wake-up detection time;

[0049] Determine whether the sleep wake-up conditions are met;

[0050] If yes, then the system operates.

[0051] Furthermore, the host and the slave communicate with each other via 485 or CAN bus.

[0052] In a second aspect, an embodiment of the present invention provides a multi-machine parallel constant pressure water supply control system based on communication control, the system comprising:

[0053] A first judgment module is used to judge whether the system has no faults and does not meet the shutdown conditions;

[0054] An adoption module is used to adopt an abnormal state processing mechanism when a fault exists and the shutdown condition is met;

[0055] A PID control module, used for the host to adopt PID control based on feedback pressure when there is no fault and the shutdown condition is not met;

[0056] The second judgment module is used to judge whether the pipe network pressure is less than the target pressure;

[0057] A first operation module, used for operating the main engine to a maximum frequency and determining a pump adding condition when the pipe network pressure is less than the target pressure;

[0058] A second operation module is used to operate the main engine to a pump reduction detection frequency and determine a pump reduction condition when the pipe network pressure is not less than the target pressure;

[0059] A determination module, used for the host to determine the station address of the slave pump to be started or stopped according to the automatic rotation control algorithm when the pump adding condition or the pump reducing condition is met;

[0060] The control module is used to control the start or stop of the corresponding slave pump according to the station address of the slave pump.

[0061] In a third aspect, an embodiment of the present invention provides an electronic device, including a memory and a processor, wherein the memory stores a computer program executable on the processor, and the processor implements the method described above when executing the computer program.

[0062] In a fourth aspect, an embodiment of the present invention provides a computer-readable medium having a non-volatile program code executable by a processor, wherein the program code enables the processor to execute the method as described above.

[0063] The embodiment of the present invention provides a multi-machine parallel constant pressure water supply control method and system based on communication control, including: judging whether the system is fault-free and does not meet the shutdown condition; if not, adopting an abnormal state processing mechanism; if yes, the host adopts PID control based on feedback pressure; judging whether the pipe network pressure is less than the target pressure; if yes, running the host to the maximum frequency and judging the pump adding condition; if not, running the host to the pump reducing detection frequency and judging the pump reducing condition; when the pump adding condition or the pump reducing condition is met, the host determines the start or stop according to the automatic rotation control algorithm The station address of the slave pump; the start or stop of the corresponding slave pump is controlled according to the station address of the slave pump; the host can view the status of the slave in real time and adjust the control strategy in real time to obtain the best control effect; the host collects feedback pressure to implement an automatic rotation control algorithm of first add first subtract and then add and then subtract, ensuring that the running time of each slave is relatively even and avoiding the situation where some slave pumps are not running for a long time; according to the pipeline pressure feedback signal, a processing mechanism for various abnormal conditions is implemented, including water shortage, underpressure, overpressure, etc., as well as a built-in sleep function to avoid the inverter and motor running at low speed for a long time, affecting the safety of the equipment.

[0064] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0065] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0067] Figure 1 A flow chart of a multi-machine parallel constant pressure water supply control method based on communication control provided in Embodiment 1 of the present invention;

[0068] Figure 2 A schematic diagram of the overall process of the abnormal state processing mechanism provided in the second embodiment of the present invention;

[0069] Figure 3 This is a schematic diagram of a multi-machine parallel constant pressure water supply control system based on communication control provided in Example 3 of the present invention. DETAILED DESCRIPTION

[0070] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0071] To facilitate understanding of this embodiment, the embodiment of the present invention is described in detail below.

[0072] Embodiment 1:

[0073] Figure 1 This is a flow chart of a multi-machine parallel constant pressure water supply control method based on communication control provided in Example 1 of the present invention.

[0074] Reference Figure 1 , the method comprises the following steps:

[0075] Step S101, determining whether the system has no faults and does not meet the shutdown conditions;

[0076] Step S102, if not, adopt an abnormal state processing mechanism;

[0077] Step S103, if yes, the host adopts PID control based on the feedback pressure;

[0078] Step S104, determining whether the pipe network pressure is less than the target pressure;

[0079] Step S105, if yes, run the host to the maximum frequency and determine the pump adding condition;

[0080] Step S106, if not, the host is operated to the pump reduction detection frequency, and the pump reduction condition is determined;

[0081] Step S107, when the pump adding condition or pump reducing condition is met, the host determines the station address of the slave pump to be started or stopped according to the automatic rotation control algorithm;

[0082] Step S108, controlling the start or stop of the corresponding slave pump according to the station address of the slave pump.

[0083] In this embodiment, one master and multiple slaves are used, and communication control is adopted between the master and the slaves to reduce wiring. The host receives the pressure feedback signal and adopts a dedicated automatic rotation control algorithm. The control of the slave pump adopts first adding and then reducing, and then adding and then reducing to ensure that in the rotation control process, the average running time of each pump is close to avoid some slave pumps running for a long time while other slave pumps are not running. In the low water consumption stage, this application only needs to rotate the minimum number of slave pumps to achieve energy saving to the greatest extent. At the same time, a built-in sleep function is built in to avoid the inverter running at a low speed for a long time when the actual pressure reaches the target pressure.

[0084] In the automatic rotation control algorithm, the number of slaves in the rotation mechanism is determined according to the preset number of slaves; the slave status is queried in real time, and the faulty slave pumps are deleted from the rotation mechanism. If the slave pumps that are not included in the rotation mechanism are found to be fault-free, they are added to the rotation mechanism in real time; the slave station addresses of the addition and subtraction pumps are recorded in real time.

[0085] When adding a pump, the station address of the pump added first is arranged in the front row, and the station address of the pump added later is arranged in the back row; when reducing a pump, the station address of the slave pump in the front row is reduced first, and then the station address of the slave pump in the back row is reduced, realizing a rotation control mechanism of adding first and then reducing, and adding later and then reducing.

[0086] Furthermore, the host and slave communicate via 485 or CAN bus. The wiring is simple, and the whole system is controlled as a whole, which makes the control more precise and the pressure more stable. The host uses patrol control to control the slave, and the station address of the slave pump that needs to be started or stopped is determined in the automatic rotation control algorithm, and the corresponding slave pump is accurately started and stopped.

[0087] Furthermore, the abnormal state handling mechanism is implemented in the following ways:

[0088] Step S201, determining whether the host has a fault;

[0089] Step S202, if yes, the system shuts down;

[0090] Step S203, if not, then the communication patrol is used to query whether the slave machine has a fault; wherein the slave machine mainly controls the slave pump through the motor;

[0091] Step S204, if yes, then delete the slave with fault from the rotation sequence;

[0092] Step S205, if not, query a slave without fault, and if the slave without fault does not exist in the rotation sequence, add the slave without fault to the rotation sequence;

[0093] Step S206, determining whether the pipe network pressure is less than the target pressure;

[0094] Step S207, if yes, then adopt the undervoltage state processing mechanism and water shortage processing logic;

[0095] Step S208: If not, the overpressure state processing mechanism and the sleep processing logic are adopted.

[0096] Further, step S207 includes the following steps:

[0097] Step S301, when the feedback pressure is less than the undervoltage protection setting value, the first duration reaches the undervoltage protection detection time;

[0098] Step S302, determining whether the undervoltage condition is valid;

[0099] Step S303, if yes, then an undervoltage signal is outputted to indicate;

[0100] Step S304: if not, then adopt the water shortage processing logic.

[0101] Furthermore, the water shortage processing logic is implemented in the following ways:

[0102] Step S401, when both the master and slave pumps are running at full frequency, the pipe network pressure is less than the water shortage detection pressure and the second duration reaches the water shortage detection time;

[0103] Step S402, determining whether a water shortage condition is met;

[0104] Step S403, if no, the system runs;

[0105] Step S404, if yes, the system shuts down, and both the host and the slave shut down;

[0106] Step S405, when the feedback pressure is greater than the water shortage detection pressure, the third duration reaches the water shortage automatic restart detection time;

[0107] Step S406, determining whether the water shortage restart condition is met;

[0108] Step S407: if yes, the system runs.

[0109] Specifically, when the feedback pressure is less than the target pressure, the master pump and the slave pump are running at full frequency, and there is no pump to add, the load is very small, the pipe network pressure is also very small, and the second duration reaches the water shortage detection time. At this time, it is considered that the system is in a water shortage state, and the system is shut down to avoid no-load operation and maximize energy saving. At the same time, the feedback pressure can be monitored in real time. When the feedback pressure is greater than the water shortage detection pressure, the third duration reaches the water shortage automatic restart detection time, and the system automatically resumes operation.

[0110] Further, step S208 includes the following steps:

[0111] Step S501, when the feedback pressure is greater than the overpressure protection setting value, the fourth duration reaches the overpressure protection detection time;

[0112] Step S502, determining whether the overpressure condition is effective;

[0113] Step S503, if yes, then an overpressure signal is outputted to indicate;

[0114] Step S504: if not, then use the sleep processing logic.

[0115] Furthermore, the sleep processing logic is implemented in the following way:

[0116] Step S601, when the host frequency is less than the sleep frequency and the feedback pressure is greater than the sleep detection pressure, the fifth duration reaches the sleep detection time;

[0117] Step S602, determining whether the sleep condition is met;

[0118] Step S603, if no, the system runs;

[0119] Step S604, if yes, the system is shut down, and the slave is in a shutdown state;

[0120] Step S605, when the feedback pressure is less than the sleep-wake-up detection pressure, the sixth duration reaches the sleep-wake-up detection time;

[0121] Step S606, determining whether the sleep wake-up condition is met;

[0122] Step S607, if yes, the system runs.

[0123] Specifically, when the feedback pressure is greater than the sleep detection pressure, there is no pump to reduce, and the host frequency is less than the sleep frequency, the fifth duration reaches the sleep detection time, and the system enters the sleep shutdown state to avoid the inverter and the motor running at low speed for a long time, reduce mechanical loss and achieve energy saving. When the feedback pressure is less than the sleep wake-up pressure and lasts for the sleep wake-up detection time, the system wakes up from the sleep state. Among them, undervoltage and overvoltage output signals are set, and signal indications are output when undervoltage or overvoltage occurs.

[0124] This application controls multiple machines in parallel through communication, simplifies wiring, and can monitor the status of slaves in real time. Faulty slaves are automatically deleted from the rotation mechanism, and slaves that are not in the rotation mechanism are automatically added to the rotation set without faults, thereby achieving more precise control of the system.

[0125] The host receives the pressure feedback signal and adopts an automatic rotation control algorithm of first adding and then subtracting, then adding and then subtracting, to ensure that during the rotation control process, the running time of each slave pump is close, avoiding some pumps running all the time and some pumps being in a shutdown state for a long time, which plays a certain role in extending the life of the equipment.

[0126] The abnormal condition handling mechanism based on the pressure feedback signal, including the water shortage detection mechanism, can prevent the system from running at no load for a long time when there is a water shortage, reduce equipment loss, and achieve energy saving. At the same time, the built-in sleep function can prevent the system from running at a low speed for a long time, reducing losses.

[0127] Embodiment 2:

[0128] Figure 2 This is a schematic diagram of the overall process of the abnormal state processing mechanism provided in the second embodiment of the present invention.

[0129] Reference Figure 2 , the method comprises the following steps:

[0130] Step S701, determining whether the host has a fault;

[0131] Step S702, if yes, the system shuts down;

[0132] Step S703, if not, then the communication patrol is used to query whether the slave machine has a fault; wherein the slave machine mainly controls the slave pump through the motor;

[0133] Step S704: if yes, the slave with the fault is deleted from the rotation sequence;

[0134] Step S705, if not, query a slave without fault, and if the slave without fault does not exist in the rotation sequence, add the slave without fault to the rotation sequence;

[0135] Step S706, determining whether the pipe network pressure is less than the target pressure;

[0136] Step S707, if yes, then the undervoltage state is processed, the feedback pressure is less than the undervoltage protection setting value, and the first duration reaches the undervoltage protection detection time;

[0137] Step S708, if not, then the overpressure state is processed, the feedback pressure exceeds the overpressure protection setting value, and continues the overpressure protection detection time;

[0138] Step S709, determining whether the undervoltage condition is valid;

[0139] Step S710, if yes, then an undervoltage signal is outputted to indicate;

[0140] Step S711, if not, then the water shortage processing logic, the master and slave pumps are running at full frequency, there is no pump to add, the load is very small, the pipe network pressure is less than the water shortage detection pressure and the water shortage detection time lasts;

[0141] Step S712, determining whether the water shortage condition is met;

[0142] Step S713, if no, the system runs;

[0143] Step S714, if yes, the system shuts down, and both the host and slave shut down;

[0144] Step S715, judging the water shortage recovery condition, the feedback pressure is greater than the water shortage detection pressure and the water shortage continues to automatically restart the detection time;

[0145] Step S716, determining whether the water shortage restart condition is met; if yes, executing step S713;

[0146] If not, continue to execute step S714;

[0147] Step S717, determining whether the overpressure condition is in effect;

[0148] Step S718, if yes, an overpressure signal is outputted to indicate;

[0149] Step S719, if no, then execute the sleep processing logic, currently there is no slave pump addition or subtraction, and the host frequency is less than the sleep frequency, the feedback pressure is greater than the sleep detection pressure, and the sleep detection time continues;

[0150] Step S720, determining whether the sleep condition is met; if not, executing step S713;

[0151] Step S721, if yes, the system is shut down, because there is no pump to reduce when the sleep condition is met, and the slave is in shutdown state at this time;

[0152] Step S722, sleep wakeup processing, when the feedback pressure is less than the sleep wakeup detection pressure and lasts for the sleep wakeup detection time;

[0153] Step S723, determine whether the sleep wake-up condition is met; if yes, execute step S713; if not, execute step S721.

[0154] Embodiment three:

[0155] Figure 3 This is a schematic diagram of a multi-machine parallel constant pressure water supply control system based on communication control provided in Example 3 of the present invention.

[0156] Reference Figure 3 The system comprises:

[0157] A first judgment module is used to judge whether the system has no faults and does not meet the shutdown conditions;

[0158] Adopting a module for adopting an abnormal state handling mechanism when a fault exists and the shutdown conditions are met;

[0159] PID control module, used for the host to adopt PID control based on feedback pressure when there is no fault and the shutdown conditions are not met;

[0160] The second judgment module is used to judge whether the pipe network pressure is less than the target pressure;

[0161] The first operation module is used to operate the main engine to the maximum frequency and determine the pump adding condition when the pipe network pressure is less than the target pressure;

[0162] The second operation module is used to operate the main engine to the pump reduction detection frequency and determine the pump reduction condition when the pipe network pressure is not less than the target pressure;

[0163] A determination module, used for the host to determine the station address of the slave pump to be started or stopped according to the automatic rotation control algorithm when the pump adding condition or the pump reducing condition is met;

[0164] The control module is used to control the start or stop of the corresponding slave pump according to the station address of the slave pump.

[0165] In this application, the master and slave machines are connected by communication to simplify wiring; at the same time, the slave machine status can be viewed in real time, and the control strategy can be adjusted in real time to obtain the best control effect; the host collects feedback pressure to implement an automatic rotation control algorithm of first adding and then subtracting, then adding and then subtracting, to ensure that the running time of each slave machine is relatively uniform, avoiding the situation where some slave pumps are not running for a long time; according to the pipeline pressure feedback signal, a variety of abnormal conditions are handled, including water shortage, underpressure, overpressure, etc., as well as a built-in sleep function, to avoid the inverter and motor running at low speed for a long time, affecting the safety of the equipment.

[0166] An embodiment of the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the multi-machine parallel constant pressure water supply control method based on communication control provided in the above embodiment are implemented.

[0167] An embodiment of the present invention also provides a computer-readable medium having a non-volatile program code executable by a processor, wherein a computer program is stored on the computer-readable medium, and when the computer program is executed by the processor, the steps of the multi-machine parallel constant pressure water supply control method based on communication control of the above embodiment are executed.

[0168] The computer program product provided in the embodiment of the present invention includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the method described in the previous method embodiment. The specific implementation can be found in the method embodiment and will not be repeated here.

[0169] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0170] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0171] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0172] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0173] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A multi-machine parallel constant pressure water supply control method based on communication control, characterized in that: The method comprises: Determine whether the system has no faults and does not meet the shutdown conditions; If not, the abnormal state handling mechanism is adopted; If yes, the host uses PID control based on the feedback pressure; Determine whether the pipe network pressure is less than the target pressure; If yes, the host is operated to the maximum frequency and the pump adding condition is determined; If not, the host is operated to the pump reduction detection frequency, and the pump reduction condition is determined; When the pump adding condition or the pump reducing condition is met, the host determines the station address of the slave pump to be started or stopped according to the automatic rotation control algorithm; The start or stop of the corresponding slave pump is controlled according to the station address of the slave pump.

2. The method for controlling water supply by constant pressure of multiple machines in parallel based on communication control according to claim 1 is characterized in that: The abnormal state handling mechanism is implemented in the following way: Determine whether the host has a fault; If yes, the system shuts down; If not, the communication patrol will inquire whether there is a fault in the slave; If so, the faulty slave is removed from the rotation sequence; If not, query a slave without fault, and if the slave without fault does not exist in the rotation sequence, add the slave without fault to the rotation sequence; Determining whether the pipe network pressure is less than the target pressure; If yes, then the undervoltage state handling mechanism and water shortage handling logic are adopted; If not, the overpressure state handling mechanism and sleep handling logic are adopted.

3. The method for controlling water supply by constant pressure of multiple machines in parallel based on communication control according to claim 2 is characterized in that: Adopt undervoltage state processing mechanism and water shortage processing logic, including: When the feedback pressure is less than the undervoltage protection setting value, the first duration reaches the undervoltage protection detection time; Determine whether the undervoltage condition is valid; If yes, the undervoltage signal output indication; If not, the water shortage handling logic is adopted.

4. The method for controlling water supply by constant pressure of multiple machines in parallel based on communication control according to claim 3 is characterized in that: The water shortage processing logic is implemented in the following way: When both the master and slave pumps are running at full frequency, the pipe network pressure is less than the water shortage detection pressure and the second duration reaches the water shortage detection time; Determine whether water shortage conditions are met; If not, the system operates; If yes, the system shuts down, and the host and the slave all shut down; When the feedback pressure is greater than the water shortage detection pressure, the third duration reaches the water shortage automatic restart detection time; Determine whether the water shortage restart condition is met; If yes, then the system operates.

5. The method for controlling water supply by constant pressure of multiple machines in parallel based on communication control according to claim 2 is characterized in that: Adopt overpressure state processing mechanism and sleep processing logic, including: When the feedback pressure is greater than the overpressure protection setting value, the fourth duration reaches the overpressure protection detection time; Determine whether the overpressure condition is in effect; If yes, then the overpressure signal output indication; If not, the sleep processing logic is adopted.

6. The method for controlling water supply with multiple machines in parallel and at a constant pressure based on communication control according to claim 5 is characterized in that: The sleep processing logic is implemented in the following way: When the host frequency is less than the sleep frequency and the feedback pressure is greater than the sleep detection pressure, the fifth duration reaches the sleep detection time; Determine whether the sleep conditions are met; If not, the system operates; If yes, the system is shut down, and the slave is in a shut down state; When the feedback pressure is less than the sleep-wake-up detection pressure, the sixth duration reaches the sleep-wake-up detection time; Determine whether the sleep wake-up conditions are met; If yes, then the system operates.

7. The method for controlling water supply with multiple machines in parallel and at a constant pressure based on communication control according to claim 2 is characterized in that: The host and the slave communicate with each other via 485 or CAN bus.

8. A multi-machine parallel constant pressure water supply control system based on communication control, characterized in that: The system comprises: A first judgment module is used to judge whether the system has no faults and does not meet the shutdown conditions; An adoption module is used to adopt an abnormal state processing mechanism when a fault exists and the shutdown condition is met; A PID control module, used for the host to adopt PID control based on feedback pressure when there is no fault and the shutdown condition is not met; The second judgment module is used to judge whether the pipe network pressure is less than the target pressure; A first operation module, used for operating the main engine to a maximum frequency and determining a pump adding condition when the pipe network pressure is less than the target pressure; The second operation module is used to operate the main engine to a pump reduction detection frequency and determine a pump reduction condition when the pipe network pressure is not less than the target pressure; A determination module, used for the host to determine the station address of the slave pump to be started or stopped according to the automatic rotation control algorithm when the pump adding condition or the pump reducing condition is met; The control module is used to control the start or stop of the corresponding slave pump according to the station address of the slave pump.

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, wherein: When the processor executes the computer program, the method according to any one of claims 1 to 7 is implemented.

10. A computer readable medium having a non-volatile program code executable by a processor, characterized in that: The program code enables the processor to execute the method according to any one of claims 1 to 7.

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