40results about How to "Avoid frequent entry" patented technology

The invention provides a method of application of a three-dimensional showing technology to warehouse goods location visualization management. The method comprises: step one, a three-dimensional warehouse panorama displaying is carried out; to be specific, three-dimensional panorama displaying of a warehouse is carried out by a using a virtual reality way; step two, an immersion type roaming is carried out; to be specific, a three-dimensional virtual scene of a warehouse is browsed freely at any place at any angle by several kinds of browsing ways; step three, surreal checking is carried out; to be specific, when the sight line of the user is blocked by goods or goods shelves, the goods or goods shelves are hidden and the goods that are stacked at the corner of the warehouse and thus can not be checked visually are checked; step four, static inventory scene displaying is carried out; to be specific, information of goods shelves, goods location, tray plates, and goods at the storage area is displayed visually; step five, goods early warning is carried out; and step six, information is queried. According to the invention, states of the warehouse zone, goods shelves, goods location, and goods are displayed in real time by the three-dimensional simulation technology; and the storage situation inside the warehouse can be displayed in real time only by the system. Moreover, functions of panorama displaying and roaming of the warehouse and early warning of goods can be realized.

The invention discloses a water purification machine and a water production control method. The water production control method is as follows: S1, detecting water pressure value P, determining the detected P and P1 which is greater; S2, when the P detected in the S1 is less than P1, entering a water production stage; S3, during the water production stage, when the detected P is greater than or equal to P2, entering a standby stage; S4, when the P detected in the S1 is greater than P1, entering the standby stage; S5, during the standby stage, determining the detected P and P1 which is greater; S6, when P detected in the S5 is greater than or equal to P1, maintaining the standby stage; S7, when P detected in the S5 is less than P1, detecting whether change value (delta P) of P within T1 is greater than (delta py); S8, when (delta P) detected in the S7 is greater than (delta py), maintaining the standby stage; and S9, when (delta P) detected in the S7 is less than or equal to (delta py), entering the water production stage. According to the water production control method, frequent start of the water purification machine can be prevented.

The invention discloses a control method of an air conditioner in a heating mode. The method comprises the steps that the environment temperature of an outdoor unit is obtained through an environmenttemperature sensor, the coil pipe temperature T1 of the outdoor unit is obtained through an outdoor unit coil pipe temperature sensor, the electronic expansion valve is controlled by a controller to adjust the opening degree, when the environment temperature is in the first preset temperature interval, the controller judges whether first preset time t1 and the outdoor unit coil pipe temperature T1meet first preset conditions or not, and if yes, the electronic expansion valve is controlled to be in the first opening degree. According to the control method of the air conditioner in the heatingmode, the low pressure and outer coil temperature are adjusted by comprehensively considering the environment temperature, the air conditioner outdoor unit coil pipe temperature and operation time, the opening degree of the electronic expansion valve is controlled to adjust the low pressure and the outer coil temperature, outdoor unit defrosting is weakened, frequent defrosting is avoided, using comfort is improved for users, and the configuration cost and the after-sales repair cost are not increased.

The invention provides an air conditioner control system. The air conditioner control system comprising a compressor, a reversing valve, an outdoor heat exchanger, an indoor heat exchanger and a throttling device; a gas inlet of the compressor communicates with the outdoor heat exchanger through the reversing valve; the outdoor heat exchanger communicates with the indoor heat exchanger through a first circuit; the throttling device is arranged on the first circuit; the indoor heat exchanger communicates with the gas inlet of the compressor through the reversing valve; the first circuit is further provided with a heat exchange device; and the heat exchange device is arranged between the throttling device and the outdoor heat exchanger. According to the scheme provided by the invention, theevaporating temperature of an air conditioning system is increased, frosting of an air conditioner is suppressed, the running time of the air conditioner is prolonged, the number of times of defrosting of a unit is reduced, the situation that the air conditioner is in the defrosting conditions frequently is avoided, and thus the heating capacity and comfort are improved.

The invention relates to the technical field of intelligent air conditioners, and discloses a control method for an air conditioner compressor. The control method comprises the following steps that correcting is carried out according to a first actual temperature drop amplitude of an inner coil pipe to obtain a first correction temperature; when the first correction temperature is smaller than a first preset temperature, the compressor is controlled to operate at the first frequency increasing speed in a frequency increasing mode; and when the first correction temperature' is larger than or equal to the first preset temperature and the first temperature difference is larger than or equal to the first set temperature difference, the compressor is controlled to operate at the second frequency increasing speed in a frequency increasing mode. In the frequency-increasing operation stage of the compressor, the temperature increasing amount within the set detection interval duration serves as a switching parameter of rapid frequency-increasing operation and slow frequency-increasing operation, the lag degree between the temperature of the inner coil pipe and frequency increasing of the compressor is reduced, and the phenomenon that the compressor is shut down due to the fact that the frequency of the compressor is increased too fast is avoided; and on the basis, the actual temperature of the inner coil pipe can be subjected to amplitude reduction correction, and the stability of the compressor is improved. The invention further discloses a control device and an air conditioner.

The invention relates to the technical field of intelligent air conditioners, and discloses a control method for an air conditioner compressor, which comprises the following steps: correcting according to a first actual temperature drop amplitude of an inner coil pipe to obtain a first corrected temperature; Under the condition that the first correction temperature is smaller than the first preset temperature, the compressor is controlled to operate at the first frequency increasing speed in a frequency increasing mode; The limiting frequency of a compressor corresponding to the current indoor environment temperature is determined; And under the condition that the first correction temperature is smaller than the first preset temperature and the current operation frequency of the compressor reaches the limiting frequency, the compressor is controlled to operate at the limiting frequency at a fixed frequency. The indoor environment temperature is introduced, amplitude reduction correction is conducted on the actual temperature of the inner coil pipe, the limiting frequency serves as the operation frequency of the fixed-frequency operation stage, the problem that the compressor frequency is too high due to hysteresis of temperature change of the inner coil pipe is effectively solved, the stability of the compressor is improved, air conditioner outlet air temperature fluctuation is avoided, and the service life of the air conditioner is prolonged. And user experience is improved. The invention further discloses a control device and the air conditioner.

The invention discloses an operation control method and system for a wind turbine generator set under an extreme wind power condition, belongs to the field of wind power generation. The rotating speed which is the most reliable measurement signal of the wind turbine generator set is adopted, and the rotating speed control effect and trend at the current moment are used as conditions for judging whether the wind turbine generator set encounters wind conditions of extreme wind speed and wind direction changes or not, so that a low-load mode is entered to protect the set. Whether the wind turbine generator set encounters the extreme wind conditions or not is judged within a short time by detecting the rotating speed difference of the wind turbine generator set and the differential product of the rotating speed difference at the moment before and after detection, and if the rotating speed difference and the differential product of the rotating speed difference exceed preset threshold values, the set enters the limited power state, the method can prevent the set from experiencing the limit load to the maximum extent, and the operation safety of the set under the extreme wind conditions is improved. The set power operation mode is controlled through the set operation state, and therefore, the operation safety of the wind turbine generator set is improved under the extreme wind conditions.

The invention relates to the technical field of intelligent control, and discloses a control method for an air conditioner compressor. The control method comprises the following steps that a first correction temperature is obtained according to the first actual temperature of an inner coil pipe and an amplitude reduction correction value; when the first correction temperature is larger than the first preset temperature, the compressor is controlled to operate at a first frequency reduction speed in a frequency reduction mode; a second correction temperature is obtained according to the second actual temperature of the inner coil pipe and the amplitude reduction correction value; a second temperature difference is acquired; and when the second temperature difference is smaller than or equal to the first set temperature difference, the compressor is controlled to operate at a second frequency reduction speed in a frequency reduction mode. In the frequency reduction operation stage of the compressor, the temperature rise amount within the set detection interval duration is used as a switching parameter of fast frequency and slow reduction, the lag degree between the temperature of the inner coil pipe and the frequency rise of the compressor is reduced, and the phenomenon of dead halt caused by too fast reduction of the frequency of the compressor is avoided; On the basis, the actual temperature of the inner coil pipe can be subjected to amplitude reduction correction, and the stability of the compressor is improved. The invention further discloses a control device and the air conditioner.

The embodiment of the invention discloses a sample testing method, a sample analyzer and a storage medium. The sample testing method comprises the following steps: acquiring a current moment and a current state of the sample analyzer; if the current moment is within a preset test time period and the current state indicates that the sample analyzer is in a state without a test task, controlling thesample analyzer to enter a test preparation state, wherein after the sample analyzer in the test preparation state receives a sample test instruction, the sample analyzer directly tests a sample to be tested; and after the sample analyzer in the idle state receives the sample testing instruction, executing a preparation process before sample testing, and then testing the sample applying for testing.

The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method for a fixed-frequency air conditioner. In order to improve the defrosting efficiency of the fixed-frequency air conditioner, the defrosting control method for the fixed-frequency air conditioner comprises the following steps: under the condition that the fixed-frequency air conditioner is in a heating working condition, the inner coil temperature and the indoor temperature are detected every the preset time; and according to the attenuation speed of the inner coil temperature and the attenuation speed of the indoor temperature, whether the fixed-frequency air conditioner enters into the defrosting mode or not is judged. The outdoor unit frosting degree is represented innovatively through the change trend of the inner coil temperature and the change trend of the indoor temperature, thus the timing of the air conditioner entering into the defrosting mode is judged, the fixed-frequency air conditioner is prevented from frequently entering into defrosting, the defrosting effect is guaranteed, and the user experience is improved.

The invention provides a defrosting method and device for a full-quality air conditioner, and relates to the technical field of air conditioners. The method comprises the following steps of acquiring an outdoor environment temperature value and an outdoor environment humidity value; calculating a dew point temperature value according to the outdoor environment temperature value and the outdoor environment humidity value; determining whether to enter a first defrosting mode or not; determining whether to enter an automatic defrosting mode or not; controlling the full-quality air conditioner to enter a refrigeration mode; and determining whether the automatic defrosting mode is quitted or not. According to the defrosting method for the full-quality air conditioner, accumulation of frost on a surface air cooler is avoided, and defrosting is clean and thorough; whether the full-quality air conditioner needs to be controlled to enter the defrosting mode or not can be accurately judged, a unit is prevented from frequently entering the defrosting mode, a defrosting interval and a defrosting operation time of each time are judged according to actual operation working conditions instead of fixed values, and therefore intelligent judgment and automatic adjustment of the defrosting time and the defrosting interval are achieved. The heating effect of the full-quality air conditioner is improved, and energy consumption is low.

The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method for a constant-frequency air conditioner. In order to improve the defrosting efficiency of the constant-frequency air conditioner, the defrosting control method for the constant-frequency air conditioner comprises the following steps that under the situation that the constant-frequency air conditioner is in the heating working condition, the indoor temperature is detected every preset time; and whether the constant-frequency air conditioner enters into a defrosting mode ornot is judged according to the decreasing speed of the indoor temperature. The change trend of the indoor temperature is innovatively utilized to represent the frosting degree of an external unit, therefore, the time when the air conditioner enters into the defrosting mode is judged, the constant-frequency air conditioner is prevented from frequently entering into the defrosting mode, the defrosting effect is ensured, and the user experience is improved.

The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method for a fixed-frequency air conditioner. In order to improve the defrosting efficiency of the fixed-frequency air conditioner, the defrosting control method for the fixed-frequency air conditioner comprises the following steps: under the condition that the fixed-frequency air conditioner is in a heating working condition, the inner coil temperature is detected every the preset time; and according to the attenuation speed of the inner coil temperature, whether the fixed-frequency air conditioner enters into the defrosting mode or not is judged. The outdoor unit frosting degree is represented innovatively through the change trend of the inner coil temperature, thus the timing of the air conditioner entering into the defrosting mode is judged, the fixed-frequency air conditioner is prevented from frequently entering into defrosting, the defrosting effect is guaranteed, and the user experience is improved.

The invention relates to a field fault detection system and method for an air-conditioner. The system comprises a first subsystem and a second subsystem; the first subsystem is used for acquiring operation data of an air-conditioner outdoor unit; and the second subsystem is used for acquiring operation data of an air-conditioner indoor unit, receiving the operation data sent by the first subsystem, processing and analyzing the operation data of the air-conditioner indoor and outdoor units to detect whether the air-conditioner is abnormal or not, and determining a maintenance scheme. The systemimproves the automatic data acquisition degree, solves the problems that maintenance personnel carry various testing tools to manually acquire the individual datum, and thus errors are prone to occurand data acquisition is asynchronous, reduces the maintenance difficulty, and improves the equipment detection efficiency and the professionalism; and various operation data of the air-conditioner can be continuously acquired after the system is installed once, so that maintenance personnel are prevented from frequently entering the outdoor air-conditioner installation position, and the system isbeneficial to reducing potential safety hazards.

The invention discloses an intelligent defrosting method for a multi-split air conditioner. The method comprises the following steps: (a) in a heating mode, after a compressor continuously operates by 5 minutes and the accumulated operation time reaches 40 minutes, the multi-split air conditioner enters a defrosting mode if the following conditions are synchronously satisfied in the following continuous 5 minutes: (1) Pd is not more than 19 bar; (2) Tdef is not more than C*Tao-alpha, wherein alpha is 8 DEG C; when Tao is lower than 0 DEG C, C is 0.8; and when Tao is not lower than 0 DEG C, C is 0.6; (b) if the condition (1) is satisfied and the condition (2) is not satisfied, the multi-split air conditioner enters the defrosting mode after the compressor continuously operates by 90 minutes; and (c) if the condition (2) is satisfied and the condition (1) is not satisfied, the multi-split air conditioner enter the defrosting mode after the compressor continuously operates by 90 minutes. The method has the following advantages: the multi-compressors can be normally used under different weather conditions in winter in the south and the north; and sending out a wrong defrosting instruction to the multi-split air conditioner by a controller can be effectively prevented.

The invention discloses an operation control method and system for wind turbines under extreme wind conditions, belonging to the field of wind power generation, using the speed of rotation, the most reliable measurement signal of wind turbines, to judge the current speed control effect and trend Whether the unit encounters the conditions of extreme wind speed and wind direction change, so it enters the low load mode to protect the unit. By detecting the speed difference of the wind turbine before and after the time and its differential product, it is judged in a short period of time whether the wind turbine has encountered an extreme wind condition. The unit experiences extreme loads, improving the operating safety of the unit under extreme wind conditions. The power operation mode of the generating set is controlled through the operating state of the generating set, so as to improve the operating safety of the wind generating set under extreme wind conditions.

The invention discloses an environment monitoring device based on big data. The environment monitoring device comprises a supporting mechanism, a negative pressure mechanism, a monitoring mechanism, a camera shooting mechanism, a data transmission mechanism, a moving mechanism and a matched charging mechanism. According to the environment monitoring device based on big data, through cooperation of the electric hydraulic push rod and the air monitoring machine, air environments at different heights can be monitored, more accurate monitoring data can be provided, environment information around the supporting frame is observed through the panoramic camera, and an observation walking route is provided for the environment monitoring device; and therefore, monitoring personnel are prevented from frequently entering a to-be-monitored room for monitoring, the violation intensity to the monitoring personnel is reduced, manual data statistics is not needed, wrong data are avoided, unnecessary economic losses are reduced, the PLC processor controls the moving mechanism to drive the supporting frame to move, in this way, the moving mechanism can be driven to monitor ambient air at different positions, and the monitoring range is widened.

This application relates to the field of intelligent control technology, and discloses a control method for air-conditioning compressors, including: obtaining the first corrected temperature according to the first actual temperature drop correction of the inner coil; when the first corrected temperature is greater than the first preset temperature , control the compressor to run at the first frequency reduction rate; obtain the second corrected temperature according to the second actual temperature drop correction of the inner coil; obtain the second temperature difference; when the second temperature difference is less than or equal to the first set temperature difference , to control the compressor to run at the second frequency reduction rate. In the stage of compressor frequency reduction operation, the temperature increase within the set detection interval is used as the switching parameter between fast frequency and slow frequency reduction to reduce the lag between the internal coil temperature and compressor frequency increase to avoid compression The frequency of the machine decreases too fast and the machine crashes. On this basis, it enables the actual temperature of the inner coil to be corrected by decreasing amplitude, and the stability of the compressor is improved. The application also discloses a control device and an air conditioner.

The invention discloses a television energy-saving control system and a television, which belong to the field of television control, and aim to solve the technical problem of how to realize the energy-saving control on the television by combining a rear-end artificial intelligence service. The system structurally comprises a camera module which is configured on a television display screen and is used for acquiring a face image; a face detection module which is configured on a back-end server and is used for detecting whether a face exists in the face image or not and determining whether the face in the face image is a front face or a non-front face by judging whether the front face in the face image faces the television display screen or not; a remote controller which is used for remotelycontrolling the working state of the television and remotely controlling the camera module to obtain the face image within the interval time; and an operation subsystem which is respectively interacted with the camera module, the face detection module and the remote controller. The television comprises the television display screen and the television energy-saving control system.

The invention belongs to the technical field of air conditioners, and in particular relates to a defrosting control method for fixed-frequency air conditioners. In order to improve the defrosting efficiency of the fixed-frequency air conditioner, the defrosting control method for the fixed-frequency air conditioner proposed by the present invention includes the following steps: when the fixed-frequency air conditioner is in the heating condition, detecting the inner disk every preset time tube temperature and indoor temperature; according to the decay speed of the inner coil temperature and the decay speed of the indoor temperature, it is judged whether to make the fixed frequency air conditioner enter the defrosting mode. The application innovatively uses the variation trend of the inner coil temperature and the variation trend of the indoor temperature to characterize the degree of frosting of the outdoor unit, and therefore determines the timing of the air conditioner entering the defrosting mode, avoids frequent defrosting of the fixed frequency air conditioner, and ensures the defrosting. effect and improve user experience.

The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method for a fixed-frequency air conditioner. The defrosting control method aims at improving the defrosting efficiency of the fixed-frequency air conditioner. The defrosting control method for the fixed-frequency air conditioner includes the following steps that under the condition that the fixed-frequency air conditioner is under a heating working condition, the indoor temperature T<indoor> is detected in real time; the difference delta T between the set temperature T<set> and the T<indoor> is calculated, wherein delta T= T<set>-T<indoor>; and according to the difference delta T, whether the fixed-frequency air conditioner gets into a defrosting manner or not is judged. Thefrosting degree of an outdoor unit is represented by innovatively utilizing the change of the indoor temperature, so that the time when the air conditioner gets into the defrosting manner is judged, the fixed-frequency air conditioner is prevented from frequently getting into the defrosting manner, the defrosting effect is guaranteed, and the user experience is improved.

The invention relates to a power grid customer service recommendation method and device based on intelligent voice analysis. A power grid customer service business recommendation device based on intelligent voice analysis comprises a call center machine room and a machine room VR three-dimensional simulation visual management unit, and the machine room VR three-dimensional simulation visual management unit comprises a cabinet, a server, network equipment, a UPS power supply, a machine room monitoring module, VR head-mounted display equipment, a voice acquisition and recognition module and an architecture module; the machine room monitoring module comprises a monitoring intelligent front end, a temperature and humidity sensor, a gas monitoring sensor and a monitoring host which are arrangedin a call center machine room, and the monitoring intelligent front end, the temperature and humidity sensor and the gas monitoring sensor are directly connected with the monitoring host; the architecture module comprises a presentation layer, a service logic layer and a data layer; a VR interactive cabin is arranged in the call center machine room, and the VR head-mounted display device, the voice acquisition and recognition module and the architecture module are arranged in the VR interactive cabin.

The invention discloses micro-bubble intervention type waste liquid recovery equipment for graphene production. The micro-bubble intervention type waste liquid recovery equipment comprises a micro-bubble intervention type anti-blocking filtering assembly, a top sinking type all-dimensional transferring assembly and a two-way vortex circulation drying and collecting assembly. The invention belongs to the technical field of graphene production waste liquid recovery, after washing waste liquid containing graphite oxide enters a filtering barrel, a large amount of graphite oxide can be precipitated on a filtering plate, and microbubble mixed liquid flowing out of a vertical liquid outlet pipe can carry the graphite oxide to the position above the liquid level, so that the situation that the filtering plate is blocked by a large amount of graphite oxide can be avoided; after the graphite oxide is adsorbed and wrapped above the liquid level by the microbubbles, waste liquid is discharged through the waste liquid discharge pipe, and the uppermost graphite oxide can fall onto the filter plate again, so that not only is the graphite oxide quickly filtered, but also the filter plate can be prevented from being blocked, and the filter effect is improved; and the microbubbles as the intermediary do not generate any chemical reaction after being contacted with the graphite oxide, so that the properties of the graphite oxide are not damaged.

The invention provides a heating-mode air conditioner control method and device. The method comprises the steps that when an air conditioner is in a heating mode, whether the temperature of an outer tube of the air conditioner drops to an early warning temperature or not is detected; and if the temperature of the outer tube of the air conditioner drops to the early warning temperature, the opening degree of an electronic expansion valve connected with an evaporator in the air conditioner is adjusted. The heating-mode air conditioner control method and device solve the technical problem that in the prior art, an air conditioner cannot conduct long-time continuous heating operation under a low-temperature condition, thereby achieving the technical effect that the continuous heating operation time of the air conditioner under the low-temperature condition is prolonged effectively.

The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method for a fixed-frequency air conditioner. In order to improve the defrosting efficiency of the fixed-frequency air conditioner, the defrosting control method for the fixed-frequency air conditioner comprises the following steps that under the condition that the fixed-frequency airconditioner is in a heating working condition, the external environment temperature T is detected, and the temperature of an inner coil is detected every preset time; and under the condition that T is smaller than dew point temperature, whether the fixed-frequency air conditioner enters a defrosting mode or not is judged according to the decay speed of the temperature of the inner coil pipe. According to the defrosting control method for the fixed-frequency air conditioner, the temperature change trend of the inner coil pipe is innovatively utilized and combined with the external environmenttemperature for characterizing the frosting degree of an outer unit, and then the time of the air conditioner for entering the defrosting mode is judged, so that the situation that the fixed-frequencyair conditioner frequently enters the defrosting mode is avoided, the defrosting effect is guaranteed, and the user experience is improved.

The invention discloses a power control system. The power control system comprises a main fuel tank, a sub fuel tank and a fuel pump, wherein the sub fuel tank is used for supplying fuel to a fuel cell system; the fuel pump is connected between the main fuel tank and the sub fuel tank; the fuel pump is connected between the main fuel tank and the sub fuel tank and connected with a control system assembly of a vehicle; the main fuel tank is provided with a main fuel tank liquid level detector; the sub fuel tank is provided with a sub fuel tank liquid level detector; the main fuel tank liquid level detector and the sub fuel tank liquid level detector are both connected with the control system assembly; the control system assembly is connected with a prompting device for outputting liquid level information; and the control system assembly can control the fuel pump according to the liquid level state of the sub fuel tank. The invention further discloses a power control system. The power control system provided by the invention can keep power supply of the vehicle to be substantially stable and prevent the vehicle from frequently entering a station to be charged; therefore, the charging time of the energy storage vehicle is saved and the convenience of the energy storage vehicle in use is also enhanced.

The invention belongs to the technical field of air conditioners, and in particular relates to a defrosting control method for a fixed-frequency air conditioner. In order to improve the defrosting efficiency of the fixed-frequency air conditioner, the defrosting control method for the fixed-frequency air conditioner proposed by the present invention includes the following steps: when the fixed-frequency air conditioner is in the heating condition, detect the internal disk every preset time Tube temperature: judging whether to make the fixed-frequency air conditioner enter the defrosting mode according to the decay speed of the inner coil temperature. This application innovatively uses the temperature change trend of the inner coil to represent the degree of frosting of the external unit, and thus judges the timing when the air conditioner enters the defrosting mode, avoids frequent defrosting of the fixed-frequency air conditioner, ensures the defrosting effect, and improves user experience.

The invention discloses a water purification machine and a water production control method. The water production control method is as follows: S1, detecting water pressure value P, determining the detected P and P1 which is greater; S2, when the P detected in the S1 is less than P1, entering a water production stage; S3, during the water production stage, when the detected P is greater than or equal to P2, entering a standby stage; S4, when the P detected in the S1 is greater than P1, entering the standby stage; S5, during the standby stage, determining the detected P and P1 which is greater; S6, when P detected in the S5 is greater than or equal to P1, maintaining the standby stage; S7, when P detected in the S5 is less than P1, detecting whether change value (delta P) of P within T1 is greater than (delta py); S8, when (delta P) detected in the S7 is greater than (delta py), maintaining the standby stage; and S9, when (delta P) detected in the S7 is less than or equal to (delta py), entering the water production stage. According to the water production control method, frequent start of the water purification machine can be prevented.