A method and device for controlling constant air volume of range hood

Abstract

The present invention provides a method and device for controlling the constant air volume of a range hood, which relates to the technical field of equipment control, and comprises: after the range hood obtains a constant air volume control instruction, collecting initial working parameters of the range hood, wherein the initial working parameters include the current speed of the range hood motor, the current back pressure of the common flue and the current outlet static pressure of the range hood duct; based on the initial working parameters, calculating current working parameters, wherein the current working parameters include the current air volume of the range hood and the current resistance coefficient of the range hood duct; if the current air volume of the range hood is different from the target air volume, calculating the target speed of the range hood motor based on the current working parameters; controlling the range hood motor to operate at the target speed so that the range hood outlet air speed is constant, thereby solving the technical problem that the method for constant air volume control of the range hood in the prior art is relatively complicated.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment control, and in particular to a method and device for controlling the constant air volume of a range hood. Background Art

[0002] The exhaust environment in the kitchens of users is different, and the differences are very large. Some exhaust conditions are even particularly bad. The actual air volume of ordinary range hoods in the kitchen will be different. Some kitchen conditions are poor, resulting in extremely low air volume, which cannot be improved. In order to solve these problems, some range hoods provide intelligent gears. Different from traditional range hoods with fixed gears, the intelligent gear can be adjusted in real time. When the air volume is too low, the air volume can be increased. When the air volume is too high, the air volume can be reduced to improve the noise experience. Some range hoods will adjust according to the amount of smoke.

[0003] However, due to the poor exhaust environment in the kitchen and the influence of other users, the conventional gear of the range hood often cannot achieve a very ideal exhaust air volume, and the air volume fluctuates greatly. Therefore, how to control the constant air volume of the range hood has become an urgent problem to be solved.

[0004] There is no effective solution to the above problems. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a method and device for controlling the constant air volume of a range hood, so as to alleviate the technical problem that the method for controlling the constant air volume of a range hood in the prior art is relatively complicated.

[0006] In a first aspect, an embodiment of the present invention provides a method for controlling a constant air volume of a range hood, comprising: after the range hood obtains a constant air volume control instruction, collecting initial working parameters of the range hood, wherein the initial working parameters include a current speed of the range hood motor, a current back pressure of a common flue, and a current outlet static pressure of the range hood duct; based on the initial working parameters, calculating current working parameters, wherein the current working parameters include a current air volume of the range hood and a current resistance coefficient of the range hood duct; if the current air volume of the range hood is different from a target air volume, calculating a target speed of the range hood motor based on the current working parameters; and controlling the range hood motor to operate at the target speed so that the air outlet speed of the range hood is constant.

[0007] Furthermore, based on the initial working parameters, the current working parameters are calculated, including: using the relationship between air volume and rotation speed and the initial working parameters to calculate the current air volume of the range hood; using the outlet static pressure calculation formula, the current air volume of the range hood and the initial working parameters to calculate the current resistance coefficient of the range hood duct.

[0008] Furthermore, the relationship between the air volume and the rotation speed is a quadratic function or a high-order function.

[0009] Furthermore, the relationship between the air volume and the rotation speed is Q = a*n 2 +b*n+c, where Q is the air volume of the range hood, n is the speed of the range hood motor, and a, b and c are constants; the outlet static pressure calculation formula is P=K*Q 2 +B, where P is the outlet static pressure of the range hood duct collected by the pressure sensor installed at the range hood outlet, B is the back pressure of the public flue collected by the pressure sensor installed at the range hood duct, and K is the resistance coefficient of the range hood duct.

[0010] Furthermore, if the current air volume of the range hood is different from the target air volume, the target speed of the range hood motor is calculated based on the current working parameters, including: calculating the target outlet static pressure of the range hood duct based on the outlet static pressure calculation formula and the target air volume; calculating the target speed of the range hood motor based on the target outlet static pressure and the outlet static pressure calculation formula.

[0011] Furthermore, based on the target outlet static pressure and the outlet static pressure calculation formula, the target speed of the range hood motor is calculated, including: based on the target air volume and the target outlet static pressure, calculating the ideal resistance coefficient of the range hood duct when the back pressure of the common flue is 0; based on the ideal resistance coefficient of the range hood duct, calculating the target speed of the range hood motor.

[0012] Furthermore, based on the target air volume and the target outlet static pressure, the ideal resistance coefficient of the range hood duct is calculated when the back pressure of the common flue is 0, including: using the target air volume, the target outlet static pressure and the wind resistance calculation formula to calculate the ideal resistance coefficient of the range hood duct.

[0013] Furthermore, the wind resistance calculation formula is K = P / Q 2 .

[0014] Furthermore, based on the ideal resistance coefficient of the range hood duct, the target speed of the range hood motor is calculated, including: based on the ideal resistance coefficient of the range hood duct, calculating the intersection data of the range hood, wherein the intersection data includes: the intersection speed of the range hood motor, the intersection air volume of the range hood and the intersection outlet static pressure of the range hood duct; based on the intersection data of the range hood, calculating the target speed.

[0015] Further, based on the ideal resistance coefficient of the range hood duct, the intersection data of the range hood is calculated, including: using the ideal resistance coefficient of the range hood duct and the objective function, and using the Ferrari algorithm to jointly calculate the intersection data of the range hood, wherein the objective function includes: the relationship between the air volume and the rotation speed, the wind resistance calculation formula and the relationship between the pressure and the rotation speed, wherein the relationship between the pressure and the rotation speed is P = e*n 2 +g*n+h, where e, g and h are constants.

[0016] Furthermore, the method further includes: if the current air volume of the range hood is the same as the target air volume, controlling the range hood motor to operate at the current rotation speed.

[0017] In a second aspect, an embodiment of the present invention further provides a control device for a constant air volume of a range hood, comprising: a collection unit, a first calculation unit, a second calculation unit and a control unit, wherein the collection unit is used to collect the initial working parameters of the range hood after the range hood obtains a constant air volume control instruction, wherein the initial working parameters include the current speed of the range hood motor, the current back pressure of the common flue and the current outlet static pressure of the range hood duct; the first calculation unit is used to calculate the current working parameters based on the initial working parameters, wherein the current working parameters include the current air volume of the range hood and the current resistance coefficient of the range hood duct; the second calculation unit is used to calculate the target speed of the range hood motor based on the current working parameters when the current air volume of the range hood is different from the target air volume; the control unit is used to control the range hood motor to operate at the target speed so that the air outlet speed of the range hood is constant.

[0018] Furthermore, the collection unit includes: a monitoring circuit, which is used to collect the current back pressure of the common flue sent by the first pressure sensor, the current outlet static pressure of the range hood duct sent by the second pressure sensor, and the current speed of the range hood motor sent by the range hood operation program after the range hood obtains the constant air volume control instruction.

[0019] Furthermore, the first calculation unit includes: a wind resistance analysis circuit and an air volume determination circuit, wherein the wind resistance analysis circuit is used to calculate the current resistance coefficient of the range hood duct based on the initial working parameters; the air volume determination circuit is used to calculate the current air volume of the range hood based on the initial working parameters.

[0020] Furthermore, the second calculation unit includes: a current air volume comparison circuit and a speed calculation circuit, wherein the current air volume comparison circuit is used to determine whether the current air volume of the range hood is the same as the target air volume; and the speed calculation circuit is used to calculate the target speed of the range hood motor based on the current working parameters when the current air volume of the range hood is different from the target air volume.

[0021] In a third aspect, an embodiment of the present invention further provides an electronic device, comprising a memory and a processor, wherein the memory is used to store a program that supports the processor to execute the method described in the first aspect above, and the processor is configured to execute the program stored in the memory.

[0022] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the method described in the first aspect are executed.

[0023] In an embodiment of the present invention, after the range hood obtains a constant air volume control instruction, the initial working parameters of the range hood are collected, wherein the initial working parameters include the current speed of the range hood motor, the current back pressure of the common flue and the current outlet static pressure of the range hood duct; based on the initial working parameters, the current working parameters are calculated, wherein the current working parameters include the current air volume of the range hood and the current resistance coefficient of the range hood duct; if the current air volume of the range hood is different from the target air volume, the target speed of the range hood motor is calculated based on the current working parameters; and the range hood motor is controlled to operate at the target speed so that the air outlet speed of the range hood is constant.

[0024] In the present application, since in the existing methods for constant air volume control of range hoods, it is generally necessary to use an iterative algorithm when calculating the speed required for the range hood motor to achieve constant air volume, resulting in high computational complexity, in the present application, it is only necessary to collect the current speed of the range hood motor, the current back pressure of the public flue and the current outlet static pressure of the range hood duct, so as to sequentially calculate the speed required to achieve constant air volume, thereby achieving the purpose of simplifying the computational complexity, and further solving the technical problem that the methods for constant air volume control of range hoods in the prior art are relatively complex, thereby achieving the technical effect of improving the real-time performance of constant air volume control of range hoods.

[0025] 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.

[0026] 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

[0027] 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.

[0028] Figure 1 A flow chart of a method for controlling constant air volume of a range hood provided by an embodiment of the present invention;

[0029] Figure 2 A flow chart of another method for controlling constant air volume of a range hood provided by an embodiment of the present invention;

[0030] Figure 3 A schematic diagram of a control device for a constant air volume of a range hood provided by an embodiment of the present invention;

[0031] Figure 4 A schematic diagram of another range hood constant air volume control device provided by an embodiment of the present invention;

[0032] Figure 5 A schematic diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] 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.

[0034] Embodiment 1:

[0035] According to an embodiment of the present invention, an embodiment of a method for controlling the constant air volume of a range hood is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0036] Figure 1 is a flow chart of a method for controlling a constant air volume of a range hood according to an embodiment of the present invention. Figure 1As shown, the method comprises the following steps:

[0037] Step S102, after the range hood obtains the constant air volume control instruction, the initial operating parameters of the range hood are collected, wherein the initial operating parameters include the current speed of the range hood motor, the current back pressure of the public flue and the current outlet static pressure of the range hood duct;

[0038] It should be noted that the outlet static pressure is the performance indicator of the range hood fan, which is used to measure the work done by the fan, and the commonly used unit is Pa.

[0039] Step S104, calculating current operating parameters based on the initial operating parameters, wherein the current operating parameters include the current air volume of the range hood and the current resistance coefficient of the range hood duct;

[0040] Step S106, if the current air volume of the range hood is different from the target air volume, calculating the target speed of the range hood motor based on the current operating parameters;

[0041] Step S108, controlling the range hood motor to operate at the target speed so that the air outlet speed of the range hood is constant.

[0042] It should be noted that air volume is a performance indicator of the range hood fan, measuring the amount of air passing through the fan per unit time, and the commonly used unit is m 3 / min.

[0043] Constant air volume means that the air volume remains constant during the operation of the fan.

[0044] In the present application, since in the existing methods for constant air volume control of range hoods, it is generally necessary to use an iterative algorithm when calculating the speed required for the range hood motor to achieve constant air volume, resulting in high computational complexity, in the present application, it is only necessary to collect the current speed of the range hood motor, the current back pressure of the public flue and the current outlet static pressure of the range hood duct, so as to calculate the speed required to achieve constant air volume at one time, thereby achieving the purpose of simplifying the computational complexity, and further solving the technical problem that the methods for constant air volume control of range hoods in the prior art are relatively complex, thereby achieving the technical effect of improving the real-time performance of constant air volume control of range hoods.

[0045] It should be noted that before the range hood leaves the factory, the staff will preset a value for the target air volume. This value is calibrated based on a variety of actual kitchen usage tests, for example, the average air volume that satisfies a better smoke extraction effect. Each gear has its own preset air volume, so a target air volume calibration table for all gears is made and placed in the system for use at any time.

[0046] At the same time, users can adjust the target air volume value in actual use to ensure the best smoking effect in their own kitchen with comfortable noise. In addition, a smarter way to determine the target air volume is to use the system's networked data center to reasonably formulate an air volume calibration table based on the wind resistance information of the building in different periods and seasons.

[0047] In the embodiment of the present invention, step S104 includes the following steps:

[0048] Step S11, using the relationship between air volume and speed and the initial working parameters, calculate the current air volume of the range hood, wherein, preferably, the relationship between air volume and speed is Q = a*n 2 +b*n+c, where Q is the air volume of the range hood, n is the speed of the range hood motor, and a, b and c are constants;

[0049] Step S12, using the outlet static pressure calculation formula, the current air volume of the range hood and the initial working parameters, calculate the current resistance coefficient of the range hood duct, wherein, preferably, the outlet static pressure calculation formula is P = K * Q 2 +B, where P is the outlet static pressure of the range hood duct collected by the pressure sensor installed at the range hood outlet, B is the back pressure of the public flue collected by the pressure sensor installed at the range hood duct, and K is the resistance coefficient of the range hood duct.

[0050] In the example of the present invention, after the range hood is turned on and the constant air volume control instruction is obtained, the current speed of the range hood motor, the current back pressure of the public flue and the current outlet static pressure of the range hood duct are collected.

[0051] Then, substitute the current speed into the relationship between air volume and speed Q = a*n 2 +b*n+c, calculate the current air volume of the range hood, where Q is the air volume of the range hood, n is the speed of the range hood motor, and a, b and c are constants.

[0052] It should be noted that the above relationship between air volume and rotation speed is preferably a quadratic function, and higher-order functions of cubic and above can also be realized.

[0053] Then, substitute the current air volume, current back pressure and current outlet static pressure into the outlet static pressure calculation formula P = K*Q 2 +B, calculate the current resistance coefficient of the range hood duct, where P is the outlet static pressure of the range hood duct collected by the pressure sensor installed at the range hood outlet, B is the back pressure of the public flue collected by the pressure sensor installed at the range hood duct, and K is the resistance coefficient of the range hood duct.

[0054] Next, it is determined whether the current air volume of the range hood is different from the target air volume.

[0055] It should be noted that the above target air volume can also be set by the user according to actual conditions.

[0056] If different, step S106 is executed, and step S106 includes the following steps:

[0057] Step S21, calculating the target outlet static pressure of the range hood duct based on the outlet static pressure calculation formula and the target air volume;

[0058] Step S22, calculating the target speed of the range hood motor based on the target outlet static pressure and the outlet static pressure calculation formula.

[0059] It should be noted that step S22 includes the following steps:

[0060] Based on the target air volume and the target outlet static pressure, calculating the ideal resistance coefficient of the range hood duct when the back pressure of the common flue is 0;

[0061] Based on the ideal resistance coefficient of the range hood duct, the target rotation speed of the range hood motor is calculated.

[0062] In the embodiment of the present invention, when the current air volume of the range hood is different from the target air volume (i.e., Q current ≠ Q target), the target wind speed, the back pressure of the public flue and the resistance coefficient of the range hood duct are substituted into the outlet static pressure calculation formula P = K * Q 2 +B, calculate the target outlet static pressure (Ptarget) of the range hood duct.

[0063] Then, calculate the ideal wind resistance when the back pressure of the public flue is 0Pa under the conditions of target air volume and target outlet static pressure. Substitute the target air volume, target outlet static pressure and B=0Pa into the outlet static pressure calculation formula to obtain the ideal resistance coefficient K 理想 =P 目标 / Q 目标 2 .

[0064] Finally, the target speed of the range hood motor is calculated using the ideal resistance coefficient of the range hood duct.

[0065] It should be noted that step S23 includes the following steps:

[0066] Step S31, calculating the intersection data of the range hood based on the ideal resistance coefficient of the range hood duct, wherein the intersection data includes: the intersection speed of the range hood motor, the intersection air volume of the range hood and the intersection outlet static pressure of the range hood duct;

[0067] Step S32, calculating the target rotation speed based on the intersection data of the range hood.

[0068] In the embodiment of the present invention, the ideal resistance coefficient of the range hood duct is substituted into the objective function to obtain the following formula, wherein the objective function includes: the relationship between air volume and rotation speed, the wind resistance calculation formula and the relationship between pressure and rotation speed, wherein the relationship between pressure and rotation speed is P = e*n 2 +g*n+h, where e, g and h are constants.

[0069] Calculate the air volume pressure and speed Q at the operating point of the range hood under ideal wind resistance 交点 , P 交点 , n 交点 .

[0070] The relationship between pressure and speed: P 交点 =e*n 交点 2 +g*n 交点 +h;

[0071] Wind resistance calculation formula: P 交点 =K 交点 *Q 交点 2 ;

[0072] The relationship between air volume and speed: Q 交点 =a*n 交点 2 +b*n 交点 +c;

[0073] Among them, P 交点 , n 交点 and Q 交点 They are respectively the intersection outlet static pressure of the range hood duct, the intersection speed of the range hood motor and the intersection air volume of the range hood.

[0074] Then, the intersection data of the range hood is calculated using the Ferrari algorithm.

[0075] Finally, according to the similar working condition relationship under 0 back pressure, the intersection data is substituted into the target speed calculation formula n 目标 =n 交点 *(Q 目标 / Q 交点 ), where n 目标 is the target speed.

[0076] After the target speed is calculated, the range hood motor is controlled to operate at the target speed so that the air outlet speed of the range hood is constant, thereby achieving the purpose of controlling the range hood to operate at a constant air volume.

[0077] This application calculates the target speed at one time through real-time collected data such as air volume and speed, mainly by combining the relationship between air volume and speed, the wind resistance calculation formula and the relationship between pressure and speed, and solving the three parameter values ​​of intersection outlet static pressure, intersection air volume and intersection speed, so as to obtain the target speed. Compared with the prior art method of solving the target speed using an iterative algorithm, this application has lower calculation complexity and better real-time performance.

[0078] In the embodiment of the present invention, Figure 2 As shown, the method also includes:

[0079] Step S105: If the current air volume of the range hood is the same as the target air volume, the range hood motor is controlled to operate at the current rotation speed.

[0080] Embodiment 2:

[0081] An embodiment of the present invention also provides a range hood constant air volume control device, which is used to execute the range hood constant air volume control method provided in the above content of the embodiment of the present invention. The following is a specific introduction to the range hood constant air volume control device provided in the embodiment of the present invention.

[0082] like Figure 3 As shown, Figure 3 Schematic diagram of the control device for the constant air volume of the range hood, which includes: a collection unit 10, a first calculation unit 20, a second calculation unit 30 and a control unit 40.

[0083] The acquisition unit 10 is used to acquire the initial working parameters of the range hood after the range hood obtains the constant air volume control instruction, wherein the initial working parameters include the current speed of the range hood motor, the current back pressure of the public flue and the current outlet static pressure of the range hood duct;

[0084] The first calculation unit 20 is used to calculate the current working parameters based on the initial working parameters, wherein the current working parameters include the current air volume of the range hood and the current resistance coefficient of the range hood duct;

[0085] The second calculation unit 30 is used to calculate the target speed of the range hood motor based on the current operating parameters when the current air volume of the range hood is different from the target air volume;

[0086] The control unit 40 is used to control the range hood motor to operate at the target speed so that the air outlet speed of the range hood is constant.

[0087] In the present application, since in the existing methods for constant air volume control of range hoods, it is generally necessary to use an iterative algorithm when calculating the speed required for the range hood motor to achieve constant air volume, resulting in high computational complexity, in the present application, it is only necessary to collect the current speed of the range hood motor, the current back pressure of the public flue and the current outlet static pressure of the range hood duct, so as to calculate the speed required to achieve constant air volume at one time, thereby achieving the purpose of simplifying the computational complexity, and further solving the technical problem that the methods for constant air volume control of range hoods in the prior art are relatively complex, thereby achieving the technical effect of improving the real-time performance of constant air volume control of range hoods.

[0088] Preferably, the collection unit includes: a monitoring circuit, which is used to collect the current back pressure of the common flue sent by the first pressure sensor, the current outlet static pressure of the range hood duct sent by the second pressure sensor, and the current speed of the range hood motor sent by the range hood operation program after the range hood obtains the constant air volume control instruction.

[0089] Preferably, the first calculation unit includes: a wind resistance analysis circuit and an air volume determination circuit, wherein the wind resistance analysis circuit is used to calculate the current resistance coefficient of the range hood duct based on the initial working parameters; and the air volume determination circuit is used to calculate the current air volume of the range hood based on the initial working parameters.

[0090] Preferably, the second calculation unit includes: a current air volume comparison circuit and a speed calculation circuit, wherein the current air volume comparison circuit is used to determine whether the current air volume of the range hood is the same as the target air volume; and the speed calculation circuit is used to calculate the target speed of the range hood motor based on the current working parameters when the current air volume of the range hood is different from the target air volume.

[0091] The following will be combined Figure 4 The above-mentioned constant air volume control device of the range hood is described in detail.

[0092] Firstly, the acquisition unit is mainly composed of a monitoring circuit 401 in the range hood, the first calculation unit is composed of a wind resistance analysis circuit 402 and an air volume determination circuit 404, and the second calculation unit is composed of a current air volume comparison circuit 403 and a speed calculation circuit 405.

[0093] The above-mentioned control device for the constant air volume of the range hood includes a monitoring circuit 401, a wind resistance analysis circuit 402, a current air volume comparison circuit 403, an air volume determination circuit 404, and a speed calculation circuit 405. The control device for the constant air volume of the range hood has information transmission with external components, for example, the control device for the constant air volume of the range hood obtains relevant data from the pressure sensors 101, 102 and the range hood operation program 300, and the control device for the constant air volume of the range hood transmits the motor speed calculation instruction to the fan 500.

[0094] When the range hood is running, the two pressure sensors 101 and 102 provide the current back pressure of the common flue and the current outlet static pressure of the range hood pipe to the monitoring circuit 401, and the range hood operation program 300 provides the current fan gear and the current speed of the range hood motor to the monitoring circuit 401. The monitoring circuit 401 calculates the current air volume based on the collected information, and sends the air volume and gear information to the current air volume comparison circuit 403. The air volume comparison circuit first determines the target air volume value, which is set by the system and given by the user, and then compares whether the air volume meets the target air volume under the current gear and gives a conclusion. At the same time, the monitoring circuit 401 transmits the air volume, speed and two pressure information to the wind resistance analysis circuit 402, and the analysis circuit calculates the current kitchen wind resistance calculation formula. The wind resistance analysis circuit 402 and the current wind volume comparison circuit 403 transmit the calculated results to the wind volume determination circuit 404, which calculates the target wind volume of the range hood according to the difference in the target wind volume and the wind resistance condition. The target wind volume can achieve the purpose of constant wind volume and ensure that the range hood will not be overloaded during operation. The speed calculation circuit 405 receives the target wind volume obtained by the determination circuit, then calculates the adjustment speed of the motor, and finally sends a speed adjustment instruction to the fan 500.

[0095] Embodiment three:

[0096] An embodiment of the present invention further provides an electronic device, including a memory and a processor, wherein the memory is used to store a program that supports the processor to execute the method described in the above embodiment 1, and the processor is configured to execute the program stored in the memory.

[0097] See also Figure 5 An embodiment of the present invention further provides an electronic device 100, comprising: a processor 50, a memory 51, a bus 52 and a communication interface 53, wherein the processor 50, the communication interface 53 and the memory 51 are connected via the bus 52; the processor 50 is used to execute an executable module stored in the memory 51, such as a computer program.

[0098] The memory 51 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk memory. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 53 (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may be used.

[0099] The bus 52 may be an ISA bus, a PCI bus, or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0100] Among them, the memory 51 is used to store programs, and the processor 50 executes the program after receiving the execution instruction. The method executed by the device for flow process definition disclosed in any embodiment of the above-mentioned embodiment of the present invention can be applied to the processor 50 or implemented by the processor 50.

[0101] The processor 50 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 50. The above processor 50 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present invention can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in the embodiments of the present invention can be directly embodied as a hardware decoding processor to be executed, or can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 51, and the processor 50 reads the information in the memory 51 and completes the steps of the above method in combination with its hardware.

[0102] Embodiment 4:

[0103] An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described in the above-mentioned embodiment 1 are executed.

[0104] 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.

[0105] 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.

[0106] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0107] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0108] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0109] 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 subject to the protection scope of the claims.

Claims

1. A method for controlling the constant air volume of a range hood. It is characterized in that include: After the range hood obtains the constant air volume control instruction, the initial working parameters of the range hood are collected, wherein the initial working parameters include the current speed of the range hood motor, the current back pressure of the public flue and the current outlet static pressure of the range hood duct; Based on the initial working parameters, current working parameters are calculated, wherein the current working parameters include a current air volume of the range hood and a current resistance coefficient of the range hood duct; Based on the initial operating parameters, calculating the current operating parameters includes: Calculate the current air volume of the range hood by using the relationship between air volume and rotation speed and the current rotation speed of the range hood motor; Calculate the current resistance coefficient of the range hood duct by using the outlet static pressure calculation formula, the current air volume of the range hood, the current back pressure of the public flue and the current outlet static pressure of the range hood duct; If the current air volume of the range hood is different from the target air volume, calculating the target speed of the range hood motor based on the current operating parameters; The range hood motor is controlled to operate at the target speed so that the air outlet speed of the range hood is constant.

2. The method according to claim 1, It is characterized in that The relationship between the air volume and the rotation speed is a quadratic function or a high-order function.

3. The method according to claim 1, It is characterized in that The relationship between the air volume and the rotation speed is Q = a*n 2 +b*n+c, where Q is the air volume of the range hood, n is the speed of the range hood motor, and a, b and c are constants; The outlet static pressure calculation formula is P = K * Q 2 +B, where P is the outlet static pressure of the range hood duct collected by the pressure sensor installed at the range hood outlet, B is the back pressure of the public flue collected by the pressure sensor installed at the range hood duct, and K is the resistance coefficient of the range hood duct.

4. The method according to claim 1, It is characterized in that If the current air volume of the range hood is different from the target air volume, the target speed of the range hood motor is calculated based on the current operating parameters, including: Calculating the target outlet static pressure of the range hood duct based on the outlet static pressure calculation formula and the target air volume; Based on the target outlet static pressure and the outlet static pressure calculation formula, the target rotation speed of the range hood motor is calculated.

5. The method according to claim 4, It is characterized in that Calculating the target speed of the range hood motor based on the target outlet static pressure and the outlet static pressure calculation formula includes: Based on the target air volume and the target outlet static pressure, calculating the ideal resistance coefficient of the range hood duct when the back pressure of the common flue is 0; Based on the ideal resistance coefficient of the range hood duct, the target rotation speed of the range hood motor is calculated.

6. The method according to claim 5, It is characterized in that Based on the target air volume and the target outlet static pressure, the ideal resistance coefficient of the range hood duct is calculated when the back pressure of the common flue is 0, including: The ideal resistance coefficient of the range hood duct is calculated using the target air volume, the target outlet static pressure and the wind resistance calculation formula.

7. The method according to claim 6, It is characterized in that The wind resistance calculation formula is K = P / Q 2 .

8. The method according to claim 6, It is characterized in that Calculating the target speed of the range hood motor based on the ideal resistance coefficient of the range hood duct includes: Based on the ideal resistance coefficient of the range hood duct, the intersection data of the range hood is calculated, wherein the intersection data includes: the intersection speed of the range hood motor, the intersection air volume of the range hood and the intersection outlet static pressure of the range hood duct; The target rotation speed is calculated based on the intersection data of the range hood.

9. The method according to claim 8, It is characterized in that Based on the ideal resistance coefficient of the range hood duct, the intersection data of the range hood is calculated, including: The intersection data of the range hood is calculated by using the ideal resistance coefficient and the objective function of the range hood duct and the Ferrari algorithm, wherein the objective function includes: the relationship between the air volume and the rotation speed, the wind resistance calculation formula and the relationship between the pressure and the rotation speed, wherein the relationship between the pressure and the rotation speed is P = e*n 2 +g*n+h, where e, g and h are constants.

10. The method according to claim 1, It is characterized in that The method further comprises: If the current air volume of the range hood is the same as the target air volume, the range hood motor is controlled to operate at the current rotation speed.

11. A control device for constant air volume of a range hood, It is characterized in that include: A collection unit, a first calculation unit, a second calculation unit and a control unit, wherein: The acquisition unit is used to acquire the initial working parameters of the range hood after the range hood obtains the constant air volume control instruction, wherein the initial working parameters include the current speed of the range hood motor, the current back pressure of the public flue and the current outlet static pressure of the range hood duct; The first calculation unit is used to calculate the current working parameters based on the initial working parameters, wherein the current working parameters include the current air volume of the range hood and the current resistance coefficient of the range hood duct; The first calculation unit includes: a wind resistance analysis circuit and an air volume determination circuit, wherein: The wind resistance analysis circuit is used to calculate the current resistance coefficient of the range hood duct by using the outlet static pressure calculation formula, the current air volume of the range hood, the current back pressure of the public flue and the current outlet static pressure of the range hood duct; The air volume determination circuit is used to calculate the current air volume of the range hood by using the relationship between the air volume and the rotation speed and the current rotation speed of the range hood motor; The second calculation unit is used to calculate the target speed of the range hood motor based on the current working parameters when the current air volume of the range hood is different from the target air volume; The control unit is used to control the range hood motor to operate at the target speed so that the air outlet speed of the range hood is constant.

12. The device according to claim 11, It is characterized in that The acquisition unit comprises: The monitoring circuit is used to collect the current back pressure of the common flue sent by the first pressure sensor, the current outlet static pressure of the range hood duct sent by the second pressure sensor, and the current speed of the range hood motor sent by the range hood operation program after the range hood obtains the constant air volume control instruction.

13. The device according to claim 11, It is characterized in that The second calculation unit includes: a current air volume comparison circuit and a speed calculation circuit, wherein: The current air volume comparison circuit is used to determine whether the current air volume of the range hood is the same as the target air volume; The rotation speed calculation circuit is used to calculate the target rotation speed of the range hood motor based on the current working parameters when the current air volume of the range hood is different from the target air volume.

14. An electronic device, It is characterized in that The method comprises a memory and a processor, wherein the memory is used to store a program for supporting the processor to execute the method according to any one of claims 1 to 10, and the processor is configured to execute the program stored in the memory.

15. A computer-readable storage medium having a computer program stored thereon, It is characterized in that When the computer program is executed by a processor, the method according to any one of claims 1 to 10 is executed.

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