Relay control method of electric auxiliary heating device, air conditioner and storage medium

Abstract

The invention provides a relay control method of an electric auxiliary heating device, an air conditioner and a storage medium, and the method comprises the following steps: when the electric auxiliary heating device works, obtaining the conduction number of relay switches needing to be conducted at present; if the conduction number is smaller than the sum of the number of the relay switches in the electric auxiliary heating device, accumulated load energy corresponding to the relay switches is obtained once every first preset duration; and the relay switches with the minimum conduction number and the minimum accumulated load energy are selected to work. By applying the relay control method of the electric auxiliary heating device, the use of each relay switch can be balanced, and the service life of the circuit is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of relay control, in particular, to a relay control method of an electric auxiliary heating device, and also relates to an air conditioner applying the relay control method of the electric auxiliary heating device, and also relates to a computer readable storage medium applying the relay control method of the electric auxiliary heating device. BACKGROUND

[0002] As an indispensable environmental conditioning device in modern life, the core function of an air conditioner is to provide a comfortable temperature and humidity environment for users through refrigeration, heating, dehumidification, ventilation and other means. Its operation relies on the coordinated work of multiple key components, including a compressor, a fan system, a condenser, an evaporator, a temperature control system, an air purification module, a fresh air system and an electric auxiliary heating device, etc. These components are controlled by relay switches to achieve start-stop and running state adjustment.

[0003] Currently, the electric auxiliary heating device of most air conditioners is controlled by multiple relay switches in combination, and the power level is proportional to the number of simultaneously opened relay switches. In the traditional method, only one relay switch is opened at low power level, and all relay switches are opened at high power level. At this time, the low-power relay is prone to shortened service life due to long-term high-voltage opening, which seriously damages the overall circuit life. For example, the internal A group of electric heating wires of the electric auxiliary heating device is opened by relay switch A, and the B group of electric heating wires is controlled by relay switch B. At low power level, any one group of electric heating wires is opened, and relay switch A or B is turned on, with relay switch A turned on by default. At high power level, relay switches A and B are turned on simultaneously. Since there are always on and off relay switches at low power level, and relay switch A is always on regardless of the power level, the load energy of each relay will inevitably differ, which will cause relay switch A to be on for a long time, leading to premature failure of relay switch A and reducing the overall circuit life.

[0004] Therefore, a more optimized relay control method for the electric auxiliary heating device needs to be considered. SUMMARY

[0005] The first object of the present application is to provide a relay control method for an electric auxiliary heating device that can balance the use of each relay switch and prolong the circuit life.

[0006] The second object of the present application is to provide an air conditioner that can balance the use of each relay switch and prolong the circuit life.

[0007] The third object of the present application is to provide a computer readable storage medium that can balance the use of each relay switch and prolong the circuit life.

[0008] In order to achieve the above-mentioned first object, the relay control method of the electric auxiliary heating device provided by the application comprises: obtaining the number of relay switches that need to be turned on currently when the electric auxiliary heating device is working; if the number is less than the total number of relay switches in the electric auxiliary heating device, obtaining the corresponding cumulative load energy of each relay switch every first preset time interval; and selecting the number of relay switches with the least cumulative load energy to work.

[0009] As can be seen from the above scheme, the relay control method of the electric auxiliary heating device can automatically switch on each relay switch, so that each relay switch works alternately, balances the use of each relay switch, and prolongs the service life of the relay switch. Moreover, the cumulative load energy of each relay switch is obtained, bypassing the traditional non-linear device heating detection, and having the ability to respond to load changes in real time.

[0010] In a further scheme, the step of obtaining the corresponding cumulative load energy of each relay switch every first preset time interval comprises: obtaining the current period use load energy and the historical cumulative load energy of the relay switch, and taking the sum of the current period use load energy and the historical use load energy as the cumulative load energy.

[0011] Therefore, the sum of the current period use load energy and the historical use load energy is taken as the cumulative load energy, which can count the total load energy of the current relay switch and has the ability to respond to load changes in real time.

[0012] In a further scheme, the current period use load energy is obtained by the following formula: current = I avg 2 *R*t; wherein, I avg is the average current flowing through the current relay switch within the first preset time, R is the contact resistance value of the relay switch, and t is the first preset time.

[0013] Therefore, the average current flowing through the current relay switch within the first preset time is used to calculate the current period use load energy, which can avoid the interference of current transient fluctuation.

[0014] In a further scheme, the electric auxiliary heating device further comprises a current detection circuit with the same number of relay switches, and one current detection circuit detects the current flowing through one relay switch; the average current of the current relay switch is obtained by the following formula: window_size = f sample *t, f sample is the sampling frequency of the current detection circuit, I k is the detection current of the kth time.

[0015] In a further aspect, after the step of obtaining the current period load energy of the current relay switch, the method further comprises: if the current period load energy of the current relay switch is greater than the preset load energy, closing the current relay switch and sending a relay overload alarm information.

[0016] Therefore, if the current period load energy of the current relay switch is greater than the preset load energy, it indicates that the relay overload phenomenon occurs, and in order to avoid damage to the relay switch, the current relay switch needs to be closed, and a relay overload alarm information is sent so as to inform the user.

[0017] In a further aspect, after the step of closing the current relay switch, the method further comprises: turning on the standby relay switch.

[0018] Therefore, after the current relay switch is closed, in order to ensure the normal operation of the electric auxiliary heating device, the standby relay switch needs to be turned on.

[0019] In a further aspect, after the step of obtaining the current period load energy of the current relay switch, the method further comprises: determining that the current relay switch is in an unopened state in the current period; and if the current period load energy is greater than zero, sending a relay sticking alarm information and closing the current relay switch.

[0020] Therefore, when the current relay switch is in an unopened state in the current period, the current period load energy should be equal to zero, and if the current period load energy is greater than zero, it indicates that the disconnection logic has been executed on the software of the current relay switch, but the hardware has not been disconnected, so the relay sticking is determined, a relay sticking alarm information is sent, and the current relay switch is closed, thereby avoiding affecting the normal operation of the electric auxiliary heating device.

[0021] In a further aspect, the step of obtaining the number of turned-on relay switches that need to be turned on comprises: obtaining a working gear of the electric auxiliary heating device; and determining the number of turned-on relay switches according to the working gear.

[0022] Therefore, each working gear of the electric auxiliary heating device needs to correspond to a number of turned-on relay switches, and therefore, the number of turned-on relay switches can be determined according to the working gear of the electric auxiliary heating device.

[0023] In order to achieve the second object of the present application, the present application provides an air conditioner comprising a processor and a memory, the memory storing a computer program, and the computer program is executed by the processor to realize the steps of the relay control method of the electric auxiliary heating device.

[0024] In order to achieve the third object of the present application, the present application provides a computer readable storage medium, which has a computer program stored thereon, and the computer program realizes the steps of the relay control method of the electric auxiliary heating device when executed by a controller. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a circuit principle block diagram of an air conditioner applying the relay control method of the electric auxiliary heating device of the present application.

[0026] Figure 2 is a flow chart of an embodiment of the relay control method of the electric auxiliary heating device of the present application.

[0027] Figure 3 is a flow chart of the overload detection step of the relay switch in an embodiment of the relay control method of the electric auxiliary heating device of the present application.

[0028] Figure 4 is a flow chart of the sticking detection step of the relay switch in an embodiment of the relay control method of the electric auxiliary heating device of the present application.

[0029] The present application will be further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0030] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative in nature and is in no way intended to limit the application, its application, or its uses, to such embodiments. The application can be implemented in numerous other forms, as will be apparent to one skilled in the art. The embodiments provided are in order to convey the subtleties of the present application and to provide a general understanding of the scope of the application. It should be noted that the relative arrangements of the components and steps illustrated in these embodiments, the composition of materials, the numerical expressions, and numerical values set forth in these embodiments are all only meant to be illustrative, and not as a limitation of the application.

[0031] The terms "first", "second", and similar terms in the present application do not denote any order, quantity, or importance, but are only used to distinguish different parts. The terms "comprise", "include", and similar terms mean that the elements before the terms encompass the elements listed after the terms, and do not exclude the possibility of also encompassing other elements. The terms "upper", "lower", "left", "right", and the like are only used to indicate relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0032] In this invention, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may be not directly connected to the other devices but have an intermediary device.

[0033] All terms used in this invention (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0034] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0035] The relay control method for the electric auxiliary heating device of the present invention is actually an application program used in air conditioners to control the relay switch of the electric auxiliary heating device.

[0036] Preferred, such as Figure 1 As shown, the air conditioner includes a main control circuit 1 and an electric auxiliary heating device 2. The main control circuit 1 controls the electric auxiliary heating device 2 to perform heating operations. In this embodiment, the electric auxiliary heating device includes at least two relay switches 21, a current detection circuit 22 with the same number of relay switches 21, and a heating element 23 with the same number of relay switches 21. One current detection circuit 22 detects the current flowing through one relay switch 21, and one relay switch controls the start / stop state of one heating element 23. The number of heating elements 23 can be set according to the gear requirements of the electric auxiliary heating device 2. Since the relays need to switch and work alternately, although this can alleviate the long-term high load pressure of a single relay, it will lead to an increase in the number of relay opening and closing operations. Preferably, the relay switches 21 are solid-state relay switches without mechanical contacts.

[0037] Optionally, the current detection circuit 22 can be obtained by electromagnetic induction. Since the current detection relies on electromagnetic coupling, the appliance is full of electromagnetic interference in the actual use environment, and the large current flowing through the load is often accompanied by ground loop noise and power supply noise, etc. These noises cause large current fluctuation amplitude and many spikes, resulting in distortion of the current detection result compared with the actual current flowing through the relay and the load. In the embodiment, RC smoothing filter is used to perform low-pass filtering on the current sampling signal to remove high-frequency noise. At the same time, on the basis of the hardware RC filter circuit, Kalman filter algorithm can be combined to dynamically optimize the RC filtered signal and eliminate low-frequency noise and burst interference. The Kalman filter algorithm is a known technology to those skilled in the art, and will not be described here.

[0038] Relay control method for electric auxiliary heating device

[0039] As shown in Figure 2 In the embodiment, the relay control method for the electric auxiliary heating device, when working, first executes step S1 to determine whether the electric auxiliary heating device is working. When it is necessary to start the electric auxiliary heating device to work, the electric auxiliary heating device can be controlled to work through the start instruction of the electric auxiliary heating device. The start instruction of the electric auxiliary heating device can be obtained by automatic detection of the air conditioning system or manually set by the user.

[0040] If the electric auxiliary heating device is not in the working state, step S1 continues to be executed for continuous detection. When the electric auxiliary heating device is working, step S2 is executed to obtain the number of relay switches that need to be turned on at present. In the embodiment, the step of obtaining the number of relay switches that need to be turned on at present includes: obtaining the working gear of the electric auxiliary heating device; and determining the number of relay switches to be turned on according to the working gear. Each working gear of the electric auxiliary heating device needs a corresponding number of relay switches to be turned on, so the number of relay switches to be turned on can be determined through the working gear of the electric auxiliary heating device. For example, when the electric auxiliary heating device includes two heating devices and two relay switches, one heating device needs to be turned on, i.e. one relay switch needs to be turned on, when a low gear needs to be started; and two heating devices need to be turned on, i.e. two relay switches need to be turned on, when a high gear needs to be started.

[0041] After obtaining the number of relay switches that need to be turned on at present, step S3 is executed to determine whether the number of relay switches to be turned on is less than the total number of relay switches in the electric auxiliary heating device. The relay switches in the electric auxiliary heating device are not synchronized in service life when they are turned on at different times, so it is necessary to balance control the relay switches when they are turned on at different times.

[0042] If the number of the turned-on relays is less than the total number of the relay switches in the electric auxiliary heating device, step S4 is performed, and the corresponding cumulative load energy of each relay switch is obtained every first preset time interval. The first preset time interval can be set according to experimental data, and the size of the first preset time interval determines the switching frequency of the relay, which further affects the user comfort. The cumulative load energy is related to the service life of the relay switch, and the cumulative load energy can be used to dynamically evaluate the wear state of the relay, therefore, the corresponding cumulative load energy of each relay switch is obtained for analysis.

[0043] In the embodiment, the step of obtaining the corresponding cumulative load energy of each relay switch every first preset time interval includes: obtaining the current cycle usage load energy and the historical cumulative load energy of the current relay switch, and taking the sum of the current cycle usage load energy and the historical cumulative load energy as the cumulative load energy. The current cycle usage load energy and the historical cumulative load energy are summed as the cumulative load energy every first preset time interval as a cycle, which can count the total load energy of the current relay switch and has the ability to respond to the load change in real time.

[0044] In the embodiment, the current cycle usage load energy is obtained by the following formula: Q current = I avg 2 *R*t; wherein, I avg is the average current flowing through the current relay switch in the first preset time interval, R is the contact resistance value of the relay switch, and t is the first preset time interval. The current cycle usage load energy is calculated by using the average current flowing through the current relay switch in the first preset time interval, which can avoid the interference of current transient fluctuation. The average current of the current relay switch is obtained by the following formula: window_size = f sample *t, f sample is the sampling frequency of the current detection circuit, I k is the kth detected current, which is obtained by the current detection circuit.

[0045] After the cumulative load energy of each relay switch is obtained, step S5 is performed to select the on quantity of relay switches with the least cumulative load energy to work. After the cumulative load energy of the relay switch is obtained, each relay switch needs to be compared to sort the relay switches according to the cumulative load energy, so that the on quantity of relay switches with the least cumulative load energy, i.e., the on quantity of relay switches at the back, can be obtained. The cumulative load energy of each relay switch can be stored in an array structure, and the on quantity of relay switches with the least cumulative load energy can be determined by traversing the cumulative load energy of all relay switches. By selecting the on quantity of relay switches with the least cumulative load energy to be turned on, each relay switch can be alternately worked, the use of each relay switch can be balanced, and the service life of the relay switch can be prolonged.

[0046] When step S3 is performed, if the on quantity is equal to the sum of the number of relay switches in the electric auxiliary heating device, it indicates that all the relay switches in the electric auxiliary heating device are turned on at the same time, and the balancing control operation of the relay switch is not needed. At this time, step S3 is continuously performed for continuous detection, and the cumulative load energy of all the relay switches is recorded.

[0047] Referring to Figure 3 In the embodiment, after the step of obtaining the current period use load energy of the current relay switch, step S11 is further performed to determine whether the current period use load energy of the current relay switch is greater than a preset load energy. The preset load energy can be set in advance according to experimental data. The system needs to detect whether each relay switch has an abnormal phenomenon every first preset time length.

[0048] If the current period use load energy of the current relay switch is less than or equal to the preset load energy, it indicates that the current relay switch is normal, and step S11 is continuously performed for detection of the next period.

[0049] If the current period use load energy of the current relay switch is greater than the preset load energy, step S12 is performed to turn off the current relay switch and send a relay overload alarm information. If the current period use load energy of the current relay switch is greater than the preset load energy, it indicates that the relay overload phenomenon occurs, and in order to avoid damage to the relay switch, the current relay switch needs to be turned off, and the relay overload alarm information is sent to the user. In order to save the calculation amount, the relay overload judgment is only performed on the relay switch turned on in the current period.

[0050] After the current relay switch is closed, step S13 is performed to turn on the standby relay switch. After the current relay switch is closed, in order to ensure the normal operation of the electric auxiliary heating device, the standby relay switch needs to be switched on. The standby relay switch can be selected according to the order of the accumulated load energy, and the relay switch with the least accumulated load energy among the relay switches that are not turned on is selected as the standby relay switch.

[0051] In the embodiment, referring to Figure 4 After the step of obtaining the load energy used in the current period of the current relay switch, step S21 is further performed to determine whether the current relay switch is in an off state in the current period. Whether the current relay switch is in an on state can be obtained by reading a record table of the system.

[0052] If the current relay switch is in an on state in the current period, the next period is determined. If it is confirmed that the current relay switch is in an off state in the current period, step S22 is performed to determine whether the load energy used in the current period is greater than zero. Since the relay switch can be in a state of always working due to the fact that the software has executed the disconnection logic but the hardware is not disconnected, the relay switch in the off state needs to be detected. The relay switch in the hardware disconnected state will not generate load energy.

[0053] If the load energy used in the current period is less than or equal to zero, it indicates that the relay switch in the off state is normal. If the load energy used in the current period is greater than zero, step S23 is performed to send a relay sticking alarm information and close the current relay switch. When the current relay switch is in an off state in the current period, the load energy used in the current period should be equal to zero. If the load energy used in the current period is greater than zero, it indicates that the software of the current relay switch has executed the disconnection logic but the hardware is not disconnected, so it is determined that the relay is sticking, the relay sticking alarm information is sent, and the current relay switch is closed to avoid affecting the normal operation of the electric auxiliary heating device.

[0054] As known from the above, the relay control method of the electric auxiliary heating device can obtain the corresponding accumulated load energy of each relay switch once every first preset time interval, and select the on quantity of relay switches with the least accumulated load energy to work, so as to automatically switch the on of each relay switch, make each relay switch work alternately, balance the use of each relay switch, and achieve the purpose of prolonging the service life of the relay switch. Moreover, the accumulated load energy of each relay switch is obtained to bypass the traditional non-linear device heating detection, and the ability of real-time response to load changes is achieved.

[0055] Air conditioner embodiment:

[0056] The air conditioner of the embodiment comprises a controller, which implements the steps in the embodiment of the relay control method of the electric auxiliary heating device when executing a computer program.

[0057] For example, the computer program can be divided into one or more modules, which are stored in the memory and executed by the controller to complete the present application. One or more modules can be a series of computer program instruction segments capable of completing a specific function, which are used to describe the execution process of the computer program in the air conditioner.

[0058] The air conditioner can comprise, but is not limited to, a controller, a memory. Those skilled in the art can understand that the air conditioner can comprise more or fewer components, or combine certain components, or different components, for example, the air conditioner can also comprise an input / output device, a network access device, a bus, etc.

[0059] For example, the controller can be a central processing unit (CPU), and can also be other general-purpose controllers, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose controller can be a microcontroller, or the controller can also be any conventional controller, etc. The controller is the control center of the air conditioner, which connects various parts of the air conditioner through various interfaces and lines.

[0060] The memory can be used to store computer programs and / or modules, and the controller realizes various functions of the air conditioner by running or executing the computer programs and / or modules stored in the memory, and calling the data stored in the memory. For example, the memory can mainly comprise a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application program required for a function (such as a sound receiving function, a sound conversion to text function, etc.), etc.; the data storage area can store data created according to the use of the mobile phone (such as audio data, text data, etc.), etc. In addition, the memory can comprise a high-speed random access memory, and can also comprise a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0061] The computer readable storage medium embodiment:

[0062] The air conditioner integrated module of the above embodiment, if realized in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, all or part of the processes in the relay control method embodiment of the electric auxiliary heating device can also be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer readable storage medium. When the computer program is executed by the controller, the steps of the relay control method embodiment of the electric auxiliary heating device can be realized. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or some intermediate forms, etc. The storage medium can include any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content contained in the computer readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.

[0063] It should be noted that the above is only a preferred embodiment of the present application, but the design concept of the application is not limited thereto, and any non-essential modification of the application made by using this concept also falls within the protection scope of the application.

Claims

1.A relay control method of an electric auxiliary heating device, the electric auxiliary heating device comprising at least two relay switches and a same number of heating devices as the relay switches, one relay switch corresponding to one heating device; the method comprising: obtaining a number of the relay switches needed to be turned on when the electric auxiliary heating device is working; if the number of the relay switches needed to be turned on is less than the total number of the relay switches in the electric auxiliary heating device, obtaining a cumulative load energy of each relay switch every first preset time interval; and selecting the number of the relay switches with the least cumulative load energy to work. 2.The relay control method of the electric auxiliary heating device according to claim 1, wherein the step of obtaining the cumulative load energy of each relay switch every first preset time interval comprises: obtaining a current period load energy and a historical cumulative load energy of the current relay switch, and taking the sum of the current period load energy and the historical cumulative load energy as the cumulative load energy. 3.The relay control method of the electric auxiliary heating device according to claim 2, wherein the current period load energy is obtained by the following formula:. 4.The relay control method of the electric auxiliary heating device according to claim 3, wherein the electric auxiliary heating device further comprises a same number of current detection circuits as the relay switches, and one current detection circuit detects a current flowing through one relay switch; and the average current of the current relay switch is obtained by the following formula:. 5.The relay control method of the electric auxiliary heating device according to claim 2, wherein after the step of obtaining the current period load energy of the current relay switch, the method further comprises: if the current period load energy of the current relay switch is greater than a preset load energy, turning off the current relay switch and sending a relay overload alarm information. 6.The relay control method of the electric auxiliary heating device according to claim 5, wherein after the step of turning off the current relay switch, the method further comprises: turning on a standby relay switch. 7.The relay control method of the electric auxiliary heating device according to claim 2, wherein after the step of obtaining the current period load energy of the current relay switch, the method further comprises: determining that the current relay switch is in an unopened state in the current period; and if the current period load energy is greater than zero, sending a relay sticking alarm information and turning off the current relay switch. 8.The relay control method of the electric auxiliary heating device according to any one of claims 1 to 7, wherein the step of obtaining the number of the relay switches needed to be turned on comprises: obtaining a working gear of the electric auxiliary heating device; and determining the number of the relay switches needed to be turned on according to the working gear. The memory stores a computer program, and the computer program is executed by the processor to realize the steps of the relay control method of the electric auxiliary heating device according to any one of claims 1 to 8. ​ Q current = I avg 2 *R*t; wherein I avg is the average current flowing through the current relay switch in the first preset time period, R is the contact resistance value of the relay switch, and t is the first preset time period. ​ ​ ​ window_size = f sample t, f sample is the sampling frequency of the current detection circuit, I k is the kth detected current. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 9. An air conditioner comprising a processor and a memory, characterized by: ​ 10. A computer readable storage medium having stored thereon a computer program, characterized in that: The computer program, when executed by the controller, implements the steps of the relay control method of the electric auxiliary heating device according to any one of claims 1 to 8.

Images