Mute energy-saving motor control system and method for range hood

Abstract

The invention belongs to the field of motor control, and particularly discloses and provides a mute energy-saving motor control system and method for a range hood, and the method comprises the steps: a soft start module obtains the initial starting voltage, target voltage and total starting time of a motor from a database, sets a starting slope curve voltage standard formula, and obtains the input voltage of each starting time point; the motor rotating speed setting module collects the cooking bench temperature and the environment smoke amount in real time and analyzes the motor operation degree index to set the frequency grade. The motor stop stage judgment module judges whether the motor enters a stop stage or not according to the operation degree index and obtains the time point and the corresponding rotating speed. And the soft stop module calculates the current and the voltage of each time point in a stop time period based on the stop time point, the initial current, the initial voltage and a current and voltage standard formula for setting a stop slope curve, so that the rotating speed of the motor is adjusted, stable starting, running and stopping of the motor are realized, and the intelligent control level and performance of the range hood are improved.

Description

Technical Field

[0001] The invention belongs to the field of motor control and relates to a silent and energy-saving motor control system and method for a range hood. Background Art

[0002] Nowadays, people's pursuit of quality of life has led to an increasing demand for the comfort of the kitchen environment. The kitchen is no longer just a place for cooking, but also a part of family life. A quiet kitchen environment allows users to enjoy a more pleasant experience during the cooking process and avoid irritation caused by noise interference. Energy saving is a global topic, and consumers are paying more and more attention to energy consumption when choosing home appliances, hoping to reduce living costs and contribute to environmental protection by using energy-saving products. For range hoods, users expect them to reduce noise and energy consumption as much as possible while efficiently absorbing oil fumes.

[0003] The existing silent and energy-saving motor control system for range hoods has some shortcomings: First, the existing technology may lack the ability to accurately control the voltage changes during the soft start of the range hood motor. The motor directly jumps from the initial voltage to the operating voltage during soft start, or the voltage change curve is unreasonable, which may lead to excessive energy loss and abnormal noise.

[0004] Secondly, in the prior art, the control of the range hood usually relies on a preset speed or power level, and fails to dynamically adjust the motor frequency level in the range hood according to the real-time collected temperature and smoke concentration of the range hood stove. This static control method limits the energy efficiency performance of the range hood under different cooking conditions, making it impossible to achieve the purpose of energy saving through frequency conversion technology.

[0005] Thirdly, the existing technology may fail to reasonably plan the current and voltage changes during the soft stop of the motor, resulting in unstable electrical conditions of the motor during the soft stop process, increasing the risk of motor damage. Due to the lack of precise soft stop control strategies, the existing technology may not be able to achieve a smooth transition of the motor during the soft stop process, resulting in unstable phenomena such as jitter and abnormal noise during the soft stop of the motor, affecting the user experience. Summary of the invention

[0006] In view of this, in order to solve the problems raised in the above background technology, a silent and energy-saving motor control system and method for a range hood is proposed.

[0007] The purpose of the present invention can be achieved through the following technical solutions: The present invention provides a silent and energy-saving motor control system for a range hood, including: a soft start module: used to extract the voltage value of the motor of the range hood at the end of the soft start process and the total soft start time from a database, set the voltage calculation formula of the soft start ramp curve set for the motor in the range hood, obtain the input voltage of the motor in the range hood at each time point within the soft start time period, and then control it.

[0008] Motor speed setting module: used to collect the temperature of the range hood stove and the amount of smoke above the range hood stove in real time, analyze the operation degree index of the motor in the range hood, and then set the target frequency level of the motor in the range hood, and obtain the current frequency level of the motor in the range hood to determine whether to adjust it.

[0009] Motor soft stop stage judgment module: used to judge whether the running state of the motor in the range hood enters the soft stop stage based on the running degree index of the motor in the range hood, and then obtain the time point t′0 when the running state of the motor in the range hood enters the soft stop stage.

[0010] Soft stop module: used to set the calculation formula of the soft stop slope curve of the voltage and current set for the motor in the range hood based on the time point when the operating state of the motor in the range hood enters the soft stop stage and the collected initial current and initial voltage corresponding to the time point when the operating state of the motor in the range hood enters the soft stop stage, and then obtain the current and voltage of the operating state of the motor in the range hood at each time point within the time period of the soft stop stage, and then adjust the speed of the motor in the range hood.

[0011] Database: used to store the voltage value of the range hood motor at the end of the soft start process and the total soft start time, store the reference temperature of the range hood stove corresponding to the soft start conditions and the reference smoke volume above the stove, and store the total soft stop time of the range hood motor during the soft stop process.

[0012] Preferably, the voltage calculation formula of the soft start ramp curve set for the motor in the range hood is specifically: where v t represents the voltage of the motor in the range hood at the tth time point during the soft start period, v′ and T represent the voltage value of the motor of the range hood at the end of the soft start process and the total soft start time, respectively, t It represents the difference between the time corresponding to the t-th time point and the start time of the motor in the range hood during the soft start process, t represents the number corresponding to the t-th time point, t=1,2,3...D.

[0013] Preferably, the specific process of obtaining the input voltage of the motor in the range hood at each time point within the soft start time period is: according to the voltage calculation formula of the soft start ramp curve set for the motor in the range hood, the input voltage of the motor in the range hood at each time point within the soft start time period is obtained, and the voltage corresponding to each time point within the soft start time period of the motor in the range hood is set as the input voltage.

[0014] Preferably, the specific process of analyzing the operation degree index of the motor in the range hood is: the temperature of the range hood stove and the amount of smoke above the range hood stove are recorded as W and S respectively.

[0015] Analyze the operation index Y of the motor in the range hood, Where W′ and S′ represent the reference temperature and the reference smoke volume above the range hood in the soft start conditions corresponding to the range hood stove extracted from the database, φ1 and φ2 represent the weights corresponding to the temperature of the range hood stove and the smoke volume above the range hood stove, respectively, and φ1+φ2=1.

[0016] Preferably, the specific process of setting the target frequency level of the motor in the range hood is: comparing the operation degree index of the motor in the range hood with the operation degree index threshold range corresponding to each preset target frequency level of the motor in the range hood; if the operation degree index of the motor in the range hood belongs to the operation degree index threshold range corresponding to a preset target frequency level of the motor in the range hood, the motor in the range hood is set to the target frequency level.

[0017] The current frequency level of the motor in the range hood is obtained by querying the control platform of the range hood, and the current frequency level of the motor in the range hood is compared with the target frequency level. If the current frequency level of the motor in the range hood is equal to the target frequency level, there is no need to adjust the current frequency level of the motor in the range hood; if the current frequency level of the motor in the range hood is not equal to the target frequency level, the current frequency level of the motor in the range hood is adjusted to the target frequency level.

[0018] Preferably, the time point at which the operating state of the motor in the range hood enters the soft stop stage is obtained, including: comparing the operating degree index of the motor in the range hood with a preset operating degree index threshold; if the operating degree index of the motor in the range hood is less than the preset operating degree index threshold, the operating state of the motor in the range hood enters the soft stop stage; the current time point is taken as the time point at which the operating state of the motor in the range hood enters the soft stop stage, recorded as t′0.

[0019] Preferably, the specific process of setting the current and voltage calculation formulas of the soft stop ramp curve set for the motor in the range hood is: the initial current and initial voltage corresponding to the time point when the operating state of the motor in the range hood enters the soft stop stage are respectively collected by the current sensor and the voltage sensor, and are recorded as I0 and v″ respectively.

[0020] The total soft stop time of the range hood motor during the soft stop process is extracted from the database and recorded as T′.

[0021] The calculation formula for the soft stop ramp curve of the voltage set for the motor in the range hood is: where v″′ t″ represents the voltage of the motor in the range hood at the t″th time point during the soft stop phase, X t″ represents the time corresponding to the t″th time point of the motor in the range hood in the soft stop stage, t″ represents the number corresponding to the t″th time point, t″=1,2,3...D′.

[0022] The calculation formula for setting the soft stop ramp curve of the motor current in the range hood is: Among them I t″ It represents the current corresponding to the t″th time point of the motor in the range hood during the soft stop phase.

[0023] Preferably, the specific process of obtaining the current and voltage at each time point in the time period of the soft stop phase of the operating state of the motor in the range hood is: substituting each time point in the time period of the soft stop phase of the operating state of the motor in the range hood into the calculation formula of the soft stop ramp curve of the current set for the motor in the range hood, and obtaining the current corresponding to each time point in the time period of the soft stop phase of the operating state of the motor in the range hood.

[0024] According to the analysis method of the current corresponding to each time point in the time period of the running state of the motor in the range hood during the soft stop phase, the voltage corresponding to each time point in the time period of the running state of the motor in the range hood during the soft stop phase is obtained similarly.

[0025] The rotation speed of the motor in the range hood is adjusted by the current and voltage corresponding to each time point in the time period of the running state of the motor in the range hood during the soft stop phase.

[0026] In a second aspect, the present invention provides a silent and energy-saving motor control method for a range hood, the method comprising: S1, soft start: extracting the voltage value of the motor of the range hood at the end of the soft start process and the total soft start time from a database, setting a voltage calculation formula for the soft start ramp curve set for the motor in the range hood, obtaining the input voltage of the motor in the range hood at each time point within the soft start time period, and then controlling it.

[0027] S2. Motor speed setting: collect the temperature of the range hood stove and the amount of smoke above the range hood stove in real time, analyze the operation degree index of the motor in the range hood, and then set the target frequency level of the motor in the range hood, and obtain the current frequency level of the motor in the range hood to determine whether to adjust it.

[0028] S3. Motor soft stop stage judgment: Based on the operation degree index of the motor in the range hood, judge whether the operation state of the motor in the range hood enters the soft stop stage, and then obtain the time point t′0 when the operation state of the motor in the range hood enters the soft stop stage.

[0029] S4. Soft stop: Based on the time point when the operating state of the motor in the range hood enters the soft stop stage and the collected initial current and initial voltage corresponding to the time point when the operating state of the motor in the range hood enters the soft stop stage, a calculation formula for the soft stop slope curve of the voltage and current set for the motor in the range hood is set, and then the current and voltage of the operating state of the motor in the range hood at each time point within the time period of the soft stop stage are obtained, and then the speed of the motor in the range hood is adjusted.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention extracts the voltage value of the range hood motor at the end of the soft start process and the total soft start time from the database, sets the voltage standard calculation formula of the soft start ramp curve set for the motor in the range hood, and obtains the input voltage of the motor in the range hood at each time point within the soft start time period. Since the motor in the range hood is soft-started according to a reasonable voltage curve, unnecessary energy loss is avoided, and the torque of the motor in the range hood can be increased smoothly, avoiding jitter and abnormal noise during the motor soft start process, thereby extending the overall service life of the motor and reducing maintenance and replacement costs.

[0031] (2) The present invention collects the temperature of the range hood stove and the amount of smoke above the range hood stove in real time, analyzes the operation degree index of the motor in the range hood, and then sets the target frequency level of the motor in the range hood to ensure that sufficient suction is provided when the range hood needs it, and reduces the power when there is less smoke, thereby avoiding unnecessary energy consumption and achieving energy-saving effects.

[0032] (3) The present invention determines whether the motor in the range hood has entered the soft stop stage based on the operation degree index of the motor in the range hood, and then obtains the time point when the operation state of the motor in the range hood enters the soft stop stage, which can provide a basis for the smooth deceleration and soft stop of the motor.

[0033] (4) The present invention sets a standard calculation formula for current and voltage of a soft stop slope curve set for the motor in the range hood based on the time point when the running state of the motor in the range hood enters the soft stop stage and the collected initial current and initial voltage corresponding to the time point when the running state of the motor in the range hood enters the soft stop stage, thereby obtaining the current and voltage at each time point in the time period of the soft stop stage of the running state of the motor in the range hood, and then adjusting the rotation speed of the motor in the range hood. The current and voltage change paths at each time point in the soft stop time period can be accurately planned, so that during the soft stop process of the motor, the current and voltage can be gradually reduced in a predetermined and reasonable manner, avoiding unstable situations such as current or voltage sag or surge, thereby providing reliable electrical conditions for the smooth operation of the motor until it stops softly. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0035] Figure 1 It is a schematic diagram of the connection of each module of the system of the present invention.

[0036] Figure 2 Schematic diagram of the steps of the method of the present invention. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0038] See also Figure 1 As shown, the present invention provides a silent and energy-saving motor control system for a range hood, comprising: a soft start module, a motor speed setting module, a motor soft stop stage judgment module, a soft stop module and a database.

[0039] The motor speed setting module is connected to the soft start module, the motor soft stop phase judgment module and the database respectively; the motor soft stop phase judgment module is connected to the motor speed setting module and the soft stop module respectively; and the database is connected to the soft start module, the motor speed setting module and the soft stop module respectively.

[0040] Soft start module: used to extract the voltage value of the range hood motor at the end of the soft start process and the total soft start time from the database, set the voltage calculation formula of the soft start ramp curve set for the motor in the range hood, obtain the input voltage of the motor in the range hood at each time point within the soft start time period, and then control it.

[0041] Furthermore, the voltage calculation formula of the soft start ramp curve set for the motor in the range hood is specifically: where v t represents the voltage of the motor in the range hood at the tth time point during the soft start period, v′ and T represent the voltage value of the motor of the range hood at the end of the soft start process and the total soft start time, respectively, t It represents the difference between the time corresponding to the t-th time point and the start time of the motor in the range hood during the soft start process, t represents the number corresponding to the t-th time point, t=1,2,3...D.

[0042] As a preferred embodiment, the specific process of the time point division is: using the method of equal time interval division, the total soft start time is divided by the required number of time points to obtain the time interval between each time point, starting from the moment the motor starts, and each time point is determined in sequence according to the time interval.

[0043] The specific process of obtaining the start-up time of the motor in the range hood during the soft start process is as follows: first, when the range hood receives a command to start the range hood, a timer is triggered to start timing. At the same time, the control platform of the motor starts to monitor the status of the motor. When current starts to flow into the motor, or the speed of the motor starts to change, etc., indicating that the motor has actually started, the time value of the timer at this time appears, and this time value is the start-up time of the motor in the range hood during the soft start process.

[0044] Furthermore, the specific process of obtaining the input voltage of the motor in the range hood at each time point within the soft start time period is: according to the voltage calculation formula of the soft start ramp curve set for the motor in the range hood, the input voltage of the motor in the range hood at each time point within the soft start time period is obtained, and the voltage corresponding to each time point within the soft start time period of the motor in the range hood is set as the input voltage.

[0045] The present invention extracts the voltage value of the motor of the range hood at the end of the soft start process and the total soft start time from a database, sets a voltage standard calculation formula for the soft start ramp curve set for the motor in the range hood, and obtains the input voltage of the motor in the range hood at each time point within the soft start time period. Since the motor in the range hood is soft-started according to a reasonable voltage curve, unnecessary energy loss is avoided, and the torque of the motor in the range hood can be increased smoothly, avoiding jitter and abnormal noise in the motor soft start process, thereby extending the overall service life of the motor and reducing maintenance and replacement costs.

[0046] Motor speed setting module: used to collect the temperature of the range hood stove and the amount of smoke above the range hood stove in real time, analyze the operation degree index of the motor in the range hood, and then set the target frequency level of the motor in the range hood, and obtain the current frequency level of the motor in the range hood to determine whether to adjust it.

[0047] Furthermore, the specific process of analyzing the operation degree index of the motor in the range hood is: the temperature of the range hood stove and the amount of smoke above the range hood stove are recorded as W and S respectively.

[0048] As a preferred embodiment, the specific process of collecting the temperature of the range hood stove is: collecting the image of the range hood stove by using an infrared camera arranged above the range hood stove, and then obtaining the temperature of each area in the image of the range hood stove by using an image processing algorithm, and filtering out the maximum temperature of the area in the image of the range hood stove, and using it as the temperature of the range hood stove.

[0049] The specific process of collecting the smoke volume above the range hood is: setting a multi-hole sieve sensor above the range hood stove, obtaining multiple smoke concentrations above the range hood stove, substituting them into an average calculation formula, and obtaining an average smoke concentration above the range hood stove, which is recorded as the smoke volume above the range hood.

[0050] Analyze the operation index Y of the motor in the range hood, Where W′ and S′ represent the reference temperature and the reference smoke volume above the range hood in the soft start conditions corresponding to the range hood stove extracted from the database, φ1 and φ2 represent the weights corresponding to the temperature of the range hood stove and the smoke volume above the range hood stove, respectively, and φ1+φ2=1.

[0051] As a preferred embodiment, the φ1 and φ2 can be set to 0.6 and 0.4 respectively, and the stove temperature can directly reflect the firepower and intensity of cooking. Generally speaking, high-temperature cooking is often accompanied by the generation of a large amount of oil smoke, but temperature is relatively a more stable indicator that can predict the trend of oil smoke changes in advance, and the generation and detection of smoke volume have a certain lag. It takes a certain amount of time for oil smoke to be generated and detected by the sensor, and during the diffusion of oil smoke, uneven distribution may cause fluctuations in smoke volume detection. In this process, the temperature has changed in advance, so the smoke volume is used as an auxiliary indicator when evaluating the operation degree index, and the weight is relatively low. Therefore, the weight corresponding to the temperature of the range hood stove is greater than the weight corresponding to the smoke volume above the range hood stove.

[0052] Furthermore, the specific process of setting the target frequency level of the motor in the range hood is: comparing the operation degree index of the motor in the range hood with the operation degree index threshold range corresponding to each preset target frequency level of the motor in the range hood; if the operation degree index of the motor in the range hood belongs to the operation degree index threshold range corresponding to a preset target frequency level of the motor in the range hood, the motor in the range hood is set to the target frequency level.

[0053] The current frequency level of the motor in the range hood is obtained by querying the control platform of the range hood, and the current frequency level of the motor in the range hood is compared with the target frequency level. If the current frequency level of the motor in the range hood is equal to the target frequency level, there is no need to adjust the current frequency level of the motor in the range hood; if the current frequency level of the motor in the range hood is not equal to the target frequency level, the current frequency level of the motor in the range hood is adjusted to the target frequency level.

[0054] As a preferred embodiment, the target frequency levels include: a low target frequency level, a medium target frequency level and a high target frequency level.

[0055] The present invention collects the temperature of the range hood stove and the amount of smoke above the range hood stove in real time, analyzes the operation degree index of the motor in the range hood, and then sets the target frequency level of the motor in the range hood, ensuring that sufficient suction is provided when the range hood needs it, and reducing power when there is less smoke, thereby avoiding unnecessary energy consumption and achieving energy-saving effects.

[0056] Motor soft stop stage judgment module: used to judge whether the running state of the motor in the range hood enters the soft stop stage based on the running degree index of the motor in the range hood, and then obtain the time point t′0 when the running state of the motor in the range hood enters the soft stop stage.

[0057] Furthermore, the time point at which the operating state of the motor in the range hood enters the soft stop stage is obtained, including: comparing the operating degree index of the motor in the range hood with a preset operating degree index threshold; if the operating degree index of the motor in the range hood is less than the preset operating degree index threshold, the operating state of the motor in the range hood enters the soft stop stage; the current time point is taken as the time point at which the operating state of the motor in the range hood enters the soft stop stage, recorded as t′0.

[0058] The present invention determines whether the motor in the range hood enters the soft stop stage based on the operation degree index of the motor in the range hood, and then obtains the time point when the operation state of the motor in the range hood enters the soft stop stage, which can provide a basis for the smooth deceleration and soft stop of the motor.

[0059] Soft stop module: used to set the calculation formula of the soft stop slope curve of the voltage and current set for the motor in the range hood based on the time point when the operating state of the motor in the range hood enters the soft stop stage and the collected initial current and initial voltage corresponding to the time point when the operating state of the motor in the range hood enters the soft stop stage, and then obtain the current and voltage of the operating state of the motor in the range hood at each time point within the time period of the soft stop stage, and then adjust the speed of the motor in the range hood.

[0060] Furthermore, the specific process of setting the current and voltage calculation formulas of the soft stop ramp curve set for the motor in the range hood is: the initial current and initial voltage corresponding to the time point when the operating state of the motor in the range hood enters the soft stop stage are respectively collected by the current sensor and the voltage sensor, and are recorded as I0 and v″ respectively.

[0061] The total soft stop time of the range hood motor during the soft stop process is extracted from the database and recorded as T′.

[0062] The calculation formula for the soft stop ramp curve of the voltage set for the motor in the range hood is: where v t ″ ″ ′ represents the voltage of the motor in the range hood at the t″th time point during the soft stop phase, X t″ represents the time corresponding to the t″th time point of the motor in the range hood in the soft stop stage, t″ represents the number corresponding to the t″th time point, t″=1,2,3...D′.

[0063] The calculation formula for setting the soft stop ramp curve of the motor current in the range hood is: Among them I t″ It represents the current corresponding to the t″th time point of the motor in the range hood during the soft stop phase.

[0064] Furthermore, the specific process of obtaining the current and voltage at each time point in the time period of the soft stop phase of the operating state of the motor in the range hood is: substituting each time point in the time period of the soft stop phase of the operating state of the motor in the range hood into the calculation formula of the soft stop ramp curve of the current set for the motor in the range hood, and obtaining the current corresponding to each time point in the time period of the soft stop phase of the operating state of the motor in the range hood.

[0065] According to the analysis method of the current corresponding to each time point in the time period of the running state of the motor in the range hood during the soft stop phase, the voltage corresponding to each time point in the time period of the running state of the motor in the range hood during the soft stop phase is obtained similarly.

[0066] The rotation speed of the motor in the range hood is adjusted by the current and voltage corresponding to each time point in the time period of the running state of the motor in the range hood during the soft stop phase.

[0067] As a preferred embodiment, the specific process of adjusting the rotational speed of the motor in the range hood is: comparing the current corresponding to each time point in the time period of the soft stop phase of the running state of the motor in the range hood with the current corresponding to the adjacent time point, and obtaining the current adjustment amount corresponding to each time point in the time period of the soft stop phase of the running state of the motor in the range hood.

[0068] According to the analysis method of the current adjustment amount corresponding to each time point in the soft stop phase of the operating state of the motor in the range hood, the voltage adjustment amount corresponding to each time point in the soft stop phase of the operating state of the motor in the range hood is obtained similarly.

[0069] The voltage adjustment amount and current adjustment amount corresponding to each time point of the operating state of the motor in the range hood during the soft stop phase are substituted into the control algorithm of the motor driver to generate a corresponding control signal, which is sent to the motor driver to adjust the current and voltage values ​​input by the motor driver to the motor in the range hood until it is finally soft stopped.

[0070] The present invention sets a standard calculation formula for current and voltage of a soft stop slope curve set for the motor in the range hood based on the time point when the running state of the motor in the range hood enters the soft stop stage and the collected initial current and initial voltage corresponding to the time point when the running state of the motor in the range hood enters the soft stop stage, thereby obtaining the current and voltage at each time point in the time period of the soft stop stage of the running state of the motor in the range hood, and then adjusting the rotation speed of the motor in the range hood. The current and voltage change paths at each time point in the soft stop time period can be accurately planned, so that during the soft stop process of the motor, the current and voltage can be gradually reduced in a predetermined and reasonable manner, avoiding unstable situations such as sudden drop or rise of current or voltage, and providing reliable electrical condition guarantee for the smooth operation of the motor until the soft stop.

[0071] Database: used to store the voltage value of the range hood motor at the end of the soft start process and the total soft start time, store the reference temperature of the range hood stove corresponding to the soft start conditions and the reference smoke volume above the stove, and store the total soft stop time of the range hood motor during the soft stop process.

[0072] Reference Figure 2 As shown, the second aspect of the present invention provides a silent and energy-saving motor control method for a range hood, the method comprising: S1, soft start: extracting the voltage value of the motor of the range hood at the end of the soft start process and the total soft start time from the database, setting the voltage calculation formula of the soft start ramp curve set for the motor in the range hood, obtaining the input voltage of the motor in the range hood at each time point within the soft start time period, and then controlling it.

[0073] S2. Motor speed setting: collect the temperature of the range hood stove and the amount of smoke above the range hood stove in real time, analyze the operation degree index of the motor in the range hood, and then set the target frequency level of the motor in the range hood, and obtain the current frequency level of the motor in the range hood to determine whether to adjust it.

[0074] S3. Motor soft stop stage judgment: Based on the operation degree index of the motor in the range hood, judge whether the operation state of the motor in the range hood enters the soft stop stage, and then obtain the time point t′0 when the operation state of the motor in the range hood enters the soft stop stage.

[0075] S4. Soft stop: Based on the time point when the operating state of the motor in the range hood enters the soft stop stage and the collected initial current and initial voltage corresponding to the time point when the operating state of the motor in the range hood enters the soft stop stage, a calculation formula for the soft stop slope curve of the voltage and current set for the motor in the range hood is set, and then the current and voltage of the operating state of the motor in the range hood at each time point within the time period of the soft stop stage are obtained, and then the speed of the motor in the range hood is adjusted.

[0076] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they shall all fall within the protection scope of the present invention.

Claims

1. A silent and energy-saving motor control system for a range hood, characterized in that: include: Soft start module: used to extract the voltage value of the motor of the range hood at the end of the soft start process and the total soft start time from the database, set the voltage calculation formula of the soft start ramp curve set for the motor in the range hood, obtain the input voltage of the motor in the range hood at each time point in the soft start time period, and then control it; Motor speed setting module: used to collect the temperature of the range hood stove and the amount of smoke above the range hood stove in real time, analyze the operation degree index of the motor in the range hood, and then set the target frequency level of the motor in the range hood, and obtain the current frequency level of the motor in the range hood to determine whether to adjust it; The motor soft stop stage judgment module is used to judge whether the running state of the motor in the range hood enters the soft stop stage based on the running degree index of the motor in the range hood, and then obtain the time point t′0 when the running state of the motor in the range hood enters the soft stop stage; Soft stop module: used to set the calculation formula of the soft stop slope curve of the voltage and current set by the motor in the range hood based on the time point when the running state of the motor in the range hood enters the soft stop stage and the collected initial current and initial voltage corresponding to the time point when the running state of the motor in the range hood enters the soft stop stage, and then obtain the current and voltage of the running state of the motor in the range hood at each time point within the time period of the soft stop stage, and then adjust the speed of the motor in the range hood; Database: used to store the voltage value of the range hood motor at the end of the soft start process and the total soft start time, store the reference temperature of the range hood stove corresponding to the soft start conditions and the reference smoke volume above the stove, and store the total soft stop time of the range hood motor during the soft stop process.

2. A silent and energy-saving motor control system for a range hood according to claim 1, characterized in that: The voltage calculation formula of the soft start ramp curve set by the motor in the range hood is specifically: X t ≤T, where v t represents the voltage of the motor in the range hood at the tth time point during the soft start period, v′ and T represent the voltage value of the motor of the range hood at the end of the soft start process and the total soft start time, respectively, t It represents the difference between the time corresponding to the t-th time point and the start time of the motor in the range hood during the soft start process, t represents the number corresponding to the t-th time point, t=1,2,3...D.

3. The silent and energy-saving motor control system for a range hood according to claim 1, characterized in that: The specific process of obtaining the input voltage of the motor in the range hood at each time point within the soft start time period is as follows: According to the voltage calculation formula of the soft start ramp curve set for the motor in the range hood, the input voltage of the motor in the range hood at each time point within the soft start time period is obtained, and the voltage corresponding to each time point in the soft start time period of the motor in the range hood is set as the input voltage.

4. The silent and energy-saving motor control system for a range hood according to claim 1, characterized in that: The specific process of analyzing the operation degree index of the motor in the range hood is as follows: The temperature of the range hood stove and the amount of smoke above the range hood stove are recorded as W and S respectively; Analyze the operation index Y of the motor in the range hood, Where W′ and S′ represent the reference temperature and the reference smoke volume above the range hood in the soft start conditions corresponding to the range hood stove extracted from the database, φ1 and φ2 represent the weights corresponding to the temperature of the range hood stove and the smoke volume above the range hood stove, respectively, and φ1+φ2=1.

5. The silent and energy-saving motor control system for a range hood according to claim 1, characterized in that: The specific process of setting the target frequency level of the motor in the range hood is as follows: The operation degree index of the motor in the range hood is compared with the preset operation degree index threshold ranges corresponding to each target frequency level of the motor in the range hood, and if the operation degree index of the motor in the range hood belongs to the preset operation degree index threshold range corresponding to a certain target frequency level of the motor in the range hood, the motor in the range hood is set to the target frequency level; The current frequency level of the motor in the range hood is obtained by querying the control platform of the range hood, and the current frequency level of the motor in the range hood is compared with the target frequency level. If the current frequency level of the motor in the range hood is equal to the target frequency level, there is no need to adjust the current frequency level of the motor in the range hood; if the current frequency level of the motor in the range hood is not equal to the target frequency level, the current frequency level of the motor in the range hood is adjusted to the target frequency level.

6. The silent and energy-saving motor control system for a range hood according to claim 1, characterized in that: The step of obtaining the time point at which the running state of the motor in the range hood enters the soft stop stage includes: The operation degree index of the motor in the range hood is compared with the preset operation degree index threshold. If the operation degree index of the motor in the range hood is less than the preset operation degree index threshold, the operation state of the motor in the range hood enters the soft stop stage, and the current time point is taken as the time point when the operation state of the motor in the range hood enters the soft stop stage, which is recorded as t′0.

7. The silent and energy-saving motor control system for a range hood according to claim 6, characterized in that: The specific process of setting the current and voltage calculation formula of the soft stop ramp curve set by the motor in the range hood is: The initial current and initial voltage corresponding to the time point when the running state of the motor in the range hood enters the soft stop stage are collected by the current sensor and the voltage sensor, respectively, and are recorded as I0 and v″; The total soft stop time of the range hood motor in the soft stop process is extracted from the database and recorded as T′; The calculation formula for the soft stop ramp curve of the voltage set for the motor in the range hood is: t0′≤X t″ ≤T′, where v t ″ ″ ′ represents the voltage of the motor in the range hood at the t″th time point during the soft stop phase, X t″ represents the time corresponding to the t″th time point of the motor in the range hood in the soft stop phase, t″ represents the number corresponding to the t″th time point, t″=1,2,3...D′; The calculation formula for setting the soft stop ramp curve of the motor current in the range hood is: t0′≤X t″ ≤T′, where I t″ It represents the current corresponding to the t″th time point of the motor in the range hood during the soft stop phase.

8. The silent and energy-saving motor control system for a range hood according to claim 1, characterized in that: The specific process of obtaining the current and voltage at each time point in the time period of the running state of the motor in the range hood during the soft stop phase is as follows: Substituting each time point of the running state of the motor in the range hood in the soft stop phase into the calculation formula of the soft stop ramp curve of the current set for the motor in the range hood to obtain the current corresponding to each time point of the running state of the motor in the range hood in the soft stop phase; According to the analysis method of the current corresponding to each time point in the time period of the running state of the motor in the range hood during the soft stop phase, the voltage corresponding to each time point in the time period of the running state of the motor in the range hood during the soft stop phase is obtained in the same way; The rotation speed of the motor in the range hood is adjusted by the current and voltage corresponding to each time point in the time period of the running state of the motor in the range hood during the soft stop phase.

9. The method for controlling a silent and energy-saving motor of a range hood according to claim 1, characterized in that: The method includes: S1, soft start: extract the voltage value of the motor of the range hood at the end of the soft start process and the total soft start time from the database, set the voltage calculation formula of the soft start ramp curve set for the motor in the range hood, obtain the input voltage of the motor in the range hood at each time point in the soft start time period, and then control it; S2, motor speed setting: collect the temperature of the range hood stove and the smoke volume above the range hood stove in real time, analyze the operation degree index of the motor in the range hood, and then set the target frequency level of the motor in the range hood, and obtain the current frequency level of the motor in the range hood to determine whether to adjust; S3, judging the motor soft stop stage: judging whether the running state of the motor in the range hood enters the soft stop stage based on the running degree index of the motor in the range hood, and then obtaining the time point t′0 when the running state of the motor in the range hood enters the soft stop stage; S4. Soft stop: Based on the time point when the operating state of the motor in the range hood enters the soft stop stage and the collected initial current and initial voltage corresponding to the time point when the operating state of the motor in the range hood enters the soft stop stage, a calculation formula for the soft stop slope curve of the voltage and current set for the motor in the range hood is set, and then the current and voltage of the operating state of the motor in the range hood at each time point within the time period of the soft stop stage are obtained, and then the speed of the motor in the range hood is adjusted.

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