292results about How to "Realize automatic control" patented technology

The invention discloses an intelligent household control system based on a cloud service network, which comprises a storage transfer service unit, a front-end master control unit, an environment monitoring subsystem, a household appliance control subsystem and a monitoring subsystem. The front-end master control unit is respectively connected with the environment monitoring subsystem, the household appliance control subsystem and the monitoring subsystem, and the storage transfer service unit acquires data via the environment monitoring subsystem and the monitoring subsystem, outputs the data to a user, receives control commands from the user, and transmits the control commands to the household appliance control subsystem via the front-end master control unit so as to control household appliances. The intelligent household control system has the advantages of safety, reliability, intelligence, convenience, comfortableness in use, energy conservation, environmental protection and low cost.

The invention provides a method and system for controlling an air conditioner. The method is applied to the control system which is connected with at least one set of air-conditioning equipment, and each set of air-conditioning equipment comprises at least one indoor unit and at least one outdoor unit, wherein at least one sensing detection device is arranged on each indoor unit. The method comprises the following steps of: acquiring at least one piece of first parameter information which is detected by at least one sensing detection device on the at least one indoor unit; processing the first parameter information to acquire a first processing result; generating one or more control instructions according to the first processing result; and transmitting the one or more control instructions to one or more in the at least one set of air-conditioning equipment to be executed. By the method and the system, the automatic control of the air-conditioning equipment is realized, the operating procedures of an air conditioner are reduced, the intellectualization of the air-conditioning equipment is further improved, and the experience degree of a user is boosted.

The invention discloses a home appliance control device, which comprises a home appliance control unit (108), external communication units (103, 105) and a display unit (107). The control device also comprises a position information setting unit (222) and a user terminal position information acquisition unit (221), wherein the position information setting unit (222) can set a position range for controlling the home appliance; the user terminal position information acquisition unit (221) is used for acquiring current position information of a user; and the home appliance control unit (108) controls the home appliance according to the set position range and the acquired current position information. Due to the adoption of the technical scheme, the system can acquire the position information of a homeowner, monitor the position of the homeowner in real time and realize the automatic control and automatic anti-theft control of household equipment through the monitored position information of the homeowner. The mobile terminal supports at least two modes of a GPS and a Beidou navigation satellite system.

The invention relates to a monitoring method and a monitoring system for replacement of batteries of an electric automobile based on a state machine and an event-driven process chain technology. When the electric automobile drives into a battery replacement station, an RFID (radio frequency identification) scanner at the entrance can read the information of an RFID tag of the electric automobile, and then authenticates the electric automobile according to the tag, including authenticating the identity of the electric automobile and the information of a required battery box of the electric automobile. The monitoring system is used for judging whether the battery box required for the electric automobile has been charged after successfully authentication, if so, starting to guide the vehicle to park to an appointed position, otherwise, prompting a driver of the electric automobile to wait. After the electric automobile is parked in place for readiness, the batteries are replaced, after all of the batteries are replaced, settlement and payment are carried out, and finally, the electric automobile can be guided to move out of the battery replacement station. According to the invention, the whole procedure of replacement of the batteries of the electric automobile can be implemented, the problem that the degree of automation of replacement of the batteries is relatively low can be solved, and the battery replacement efficiency and reliability can be greatly improved.

The invention discloses a method for separating and purifying glufosinate-ammonium solution. The method comprises the steps of: adding 1-5 times of water into the glufosinate-ammonium solution for dilution, carrying out the combined technique of nanofiltration membrane separation and electroosmosis membrane separation to obtain solution C containing 15-30% glufosinate-ammonium and 0.05-0.5% inorganic salt and solution F containing 0.01-0.1% glufosinate-ammonium and 3-7% inorganic salt, wherein the solution C is used for preparing high-purity glufosinate-ammonium, and the solution F is used for extracting the inorganic salt. The method for separating and purifying the glufosinate-ammonium solution has the advantages of being simple in operation, low in treatment cost, low in energy consumption, high in yield of the glufosinate-ammonium, good in product quality and capable of realizing automatic control.

The invention discloses an automatic placing and withdrawing device for a traffic road cone. The automatic placing and withdrawing device comprises a support, a transverse movement mechanism, a movement supporting plate, a swing arm mechanism, a transverse motor, a swing arm motor and proximity switches. The transverse movement mechanism is arranged on the support, the movement supporting plate is installed above the transverse movement mechanism, the swing arm mechanism is connected with the movement supporting plate, the transverse motor is connected with the transverse movement mechanism in a controlling mode, the swing arm motor is connected with the swing arm mechanism in a controlling mode, and the proximity switches are arranged on the transverse motor and the swing arm motor. The automatic placing and withdrawing device for the traffic road cone is simple in structure and capable of achieving automatic control, and saves lots of manpower and material resources.

The embodiment of the invention provides a method and a terminal for controlling the flipping-over of a page when the page is browsed by the terminal. The method comprises the following steps of: monitoring an angle formed between the terminal and a reference direction or an angle variation degree relative to the reference direction at regular time; generating and sending a page flipping-over motion instruction corresponding to the angle or the angle variation degree; and executing the page flipping-over motion instruction. The flipping-over motion of the terminal can be automatically controlled by the method and the terminal provided by the embodiment of the invention through the regular monitoring of the angle formed between the terminal and the reference direction or the angle variation degree relative to the reference direction.

The invention relates to metal wire processing equipment, in particular to a numerical control coil machine and a method for continuously processing a coil by using the same. According to the numerical control coil machine provided by the invention, a wire feeding mechanism can automatically feed a wire and align the wire, so that the metal wire is effectively aligned and is kept in a straight line; a wire feeder can automatically feed and withdraw the metal wire; a stop device is used for preventing the metal wire from moving without control in the machining process; a required spiral ring-shaped structure can be processed on the metal wire by a winding shaft and a spiral turn number and a spiral rotating angle which are required by the spiral ring-shaped structure can be obtained; two straight line break angles can be processed on the metal wire by matching of a positioning pillar and a bent head, so that the metal wire can obtain a required random shape; a wire cutting seat is used for carrying out cut-off separation on the processed metal wire; and when the numerical control coil machine is matched with a numerical control device, automation control on processing of the coil can be implemented, labor is reduced and working efficiency and accuracy of the coil processing are improved.

An embodiment of the invention relates to the field of automatic control and provides a conference room management method, a central controller and a conference room management system in order to realize automatic control of conference rooms. The conference room management method includes acquiring conference room information, use time information and equipment configuration information; according to the equipment configuration information, generating corresponding control information including at least one sub-control information which includes equipment identification numbers and control action information; and sending the sub-control information to corresponding equipment at corresponding start or end time of the use time information to control the corresponding equipment to act according to the sub-control information. The conference room management method, the central controller and the conference room management system can be applied to schools and enterprises.

The invention relates to a device for separating iron mold with casting piece during casting production of sand coated iron mold of wheel castings. The ejecting cylinder is arranged on the upper cover plate of the rack, the ejecting cylinder being connected with the ejector rod plate which is provided with a multiplicity of ejector rods. The number and the distributing position on the ejector plate of the ejector rods are in one-to-one correspondence with the number and position of the core-shooting holes of the iron mold. A casting part-connecting device is fixed on the foundation of the rack. One side of the rack is provided with a vibrating device which is in contact with the casting while at work. The iron mold rollgang is arranged below the ejector rod plate and is fixed on the back side of the ejector rod plate, the iron mold rollgang being synchronized with the ejector rod plate. The iron mold stack is fixed on the bottom of the rack and is positioned below the iron mold rollgang. The iron mold positioning device is fixed in the middle of the working position of the iron mold rollgang, the iron mold positioning device being synchronized with the iron mold rollgang. By adopting the aforementioned device, the invention completely separates the casting piece with iron mold through ejecting pressure and vibrating force, and at the same time cleans up residual sands in the cavity of iron mold, which satisfies the production requirement of mass production.

The invention relates to a device for detecting the service life of a light emitting diode (LED) in real time. The device comprises a temperature control box, a supporting base and light transmission devices which are arranged in the temperature control box, and a light measuring apparatus which is connected with measuring ends of the light transmission devices, wherein the other end of each light transmission device is an acquisition end; and the acquisition ends are matched with the supporting base. The device is characterized by also comprising light collectors with light inlet windows and light outlet windows, wherein the acquisition ends of the light transmission devices are connected to the light outlet windows of the light collectors; and the supporting base is matched with the light inlet windows on the light collectors. The device has the excellent characteristics that 1, the luminous power or the luminous flux of an LED sample at certain working temperature can be measured directly by the light measuring apparatus and a temperature measuring apparatus, so that automatic control can be realized, repetitive manual operation is not needed, measurement errors are reduced, and measurement accuracy is improved; and 2, as the light collectors (such as light integrating balls) are used for acquiring light sources, the detection result is difficultly influenced by samples aside, and the service life of an LED product can be predicated accurately.

The invention discloses a lens clamp mechanism for automatic coupling and packaging of a butterfly-shaped semiconductor laser, and relates to the field of automatic coupling and packaging of electronic devices. The lens clamp mechanism comprises a lens clamp position adjusting device and a lens clamp. The lens clamp is fixed to the lens clamp position adjusting device through a clamp adapter plate. The lens clamp is in a T shape wholly, a lens adsorption hole is formed in one end of the lens clamp, an air suction pipe connecting hole is formed in the other end of the lens clamp, and the air suction pipe connecting hole and the lens adsorption hole are communicated inside the lens clamp. By means of an air suction pipe connected to the air suction pipe connecting hole, negative pressure isformed on the lens adsorption hole, and therefore a lens is adsorbed on the clamp. By means of the lens clamp mechanism, the position of the lens clamp can be finely adjusted conveniently, and by means of adjustment of multiple freedom degrees, the lens can be more accurately put in the laser. The lens clamp mechanism is used in cooperation with a material tray mechanism, so that the angle and theposition of the lens are conveniently adjusted.

The invention discloses a visitor control management system. The visitor control management system comprises a cloud server which is connected with a local management system; the local management system is connected with a card slot control system, an access control system and an elevator management control system; the cloud server is in communication connection with visitor terminal equipment and interviewee terminal equipment; the local management system is used for acquiring fingerprint information or two-dimensional code information, and transmitting the acquired fingerprint information or the two-dimensional code information to the cloud sever if a user is judged to be a visitor; the cloud server is used for registering the user, receiving visitor application, transmitting visitor application information to the interviewee terminal equipment, and generating a visitor record according to the visitor application information if an interviewee agrees; the fingerprint information or the two-dimensional code information is compared with the visitor application information of the corresponding visitor in the visitor record; a comparison result is transmitted to the local management system to control a corresponding system to act. Through fingerprint or two-dimensional code control card slot equipment, access control equipment and elevator equipment, the work efficiency can be improved greatly.

The invention discloses a smart onboard system which is characterized in that the smart onboard system includes a wireless communication module, a GPS module, a driving data acquiring module, a calibration module, a smart household control module and a processor. The GPS module acquires a user's current position and map road conditions, calculates predicted time for going through each road section and predicted time for arriving at home. The driving data acquiring module, through a CAN total interface line, acquires real-time vehicle velocity, and obtains actual time for going through the current road section. The calibration module conducts ratio calculation on the actual time for going through the current road section and the predicted time for going through the current section, and obtains a difference coefficient P. The processor receives the predicted time for arriving at home from the GPS module and P value from the driving data acquiring module, and calculates the predicted time for arriving at home after calibration, and again in accordance with the smart household working hours given by the smart household control module, compares the smart household working hours with the predicted time for arriving at home after calibration, and sends a household control instruction through the wireless communication module based on the comparison result, and gives feedback through the wireless communication module.

The invention discloses an automatic control mechanism of a carbureter air choke valve of a general gasoline motor. A control device for driving the air choke valve to open is rotatably connected on a fan wind scooper of the general gasoline motor; one end of the control device is a blade, and the other end is a control arm; a rotatable center axle sleeve is arranged between the blade and the control arm and is in a clearance fit with a shaft arranged on the side wall of the fan wind scooper; the blade extends into the fan wind scooper and is arranged in an air duct; one end of the shaft of the air choke valve is provided with a crank; a first pull rod is connected between the crank and the control arm; the shaft of the air choke valve is movably sleeved with a stop block; a thermo-sensitive mechanism is arranged on a muffler; a second pull rod is connected between the stop block and the thermo-sensitive mechanism; and the shaft of the air choke valve is sleeved with an offset torsional spring enabling the air choke valve to be always in closes state. The automatic control mechanism enables the air choke valve to keep the open state in the thermomechanical condition and to automatically close in the cooling-down condition, and ensures the general gasoline motor can be normally and smoothly started up in both cooling-down and thermomechanical conditions.

The invention discloses an automatic needle-turning and loop-transferring flat machine with a spring leaf knitting needle and a machine head of an improved hand-operated flat machine, in particular a flat machine provided with two needle pushers on one side of the machine head and a needle pushing method of the needle pusher. Each needle pusher comprises an electric motor (31), a gear (32), a rack (33), a guide rail (341), an electromagnet frame (343), an electromagnet (35), an electromagnet iron core (36), an h-shaped cramp (37), a lower foot (371) of the cramp, an upper foot (372) of the cramp and a guide rail (381), wherein the rotation of the electric motor (31) of the needle pusher drives the h-shaped cramp (37) on the electromagnet (35) to push up and down; the h-shaped cramp (37) comprises the lower foot (371) of the cramp and the upper foot (372) of the cramp; and the precise rotation of the electric motor (31) of the needle pusher and the electromagnet (35) are controlled by a computer. The flat machine of the invention can automatically knit, push needles, and do various complicated loop transferring actions.

The invention relates to an automatic electromagnetic ultrasonic flaw detection apparatus, which comprises a probe cover, an electromagnetic ultrasonic transducer installed in the probe cover, and a detection control circuit system installed in the probe cover, wherein the tail portion of the electromagnetic ultrasonic transducer is connected to a rack, the rack can control the stretching of the electromagnetic ultrasonic transducer in the sensing channel of the probe cover after the rack is driven by the gear driven by a servo motor, a distance measurement head is arranged in the probe cover and can sense the distance between the probe cover and the surface of a work-piece to be detected, the distance signal detected by a sensor is received by the detection control circuit system, and the rotation of the servo motor is controlled, such that the automatic control of the distance between the electromagnetic ultrasonic transducer and the surface of the work-piece to be detected is achieved, and the detection fluctuation caused by the manual grip is solved.

The invention discloses a transverse and longitudinal cutting control method and a control system of plate products, which can automatically and accurately control the transverse and longitudinal cutting of the plates. The method comprises the following steps that: the following position(s) of one or a plurality of devices is(are) adjusted according to the size of an original plate and the number of small plates required to be cut and/or the specification: a first cutting unit, a second cutting unit and the initial position of a propulsion unit, wherein the distance between the initial position of the propulsion unit and the second cutting unit is equal to or larger than the width of the original plate; the original plate is controlled to pass through a first roller conveyor to enter the first cutting unit so as to finish a first cutting, and the plate undergone the first cutting is continuously conveyed onto a second roller conveyor by the first roller conveyor; after the plate undergone the first cutting completely enters the second roller conveyor, the propulsion unit is started to push the plate to move towards the direction of the second cutting unit; the second cutting unit finishes the second cutting of the plate; and the propulsion unit returns to the initial position.

The invention discloses an intelligent indoor lighting control system and method. The system comprises an indoor part and an outdoor part, wherein the outdoor part comprises an outdoor controller and at least one illumination intensity sensor; the indoor part comprises an indoor controller, an indoor light source system and a controllable shading system; the illumination intensity sensor senses the illumination intensity of the outdoors; the outdoor controller is connected with the illumination intensity sensor on one hand to collect illumination intensity data and is also connected with the indoor controller on the other hand to transmit the illumination intensity data; and the indoor controller is connected with the indoor light source system and the controllable shading system and respectively controls the working ways of the indoor light source system and the controllable shading system according to the illumination intensity data. Through the organic combination of the indoor light source system and the controllable shading system, the intelligent indoor lighting control system and method realize the automatic control of the indoor illumination intensity and can be widely applied to automatic illumination intensity adjustment of indoor places such as families, schools, offices, plants and the like.

A cable flame-retardant combustion test device based on automatic control of a computer includes an electrical control cabinet, a power source, a test sample bracket, a burner, a fuel gas regulating valve, an air regulating valve, a voltage regulator, a voltage regulation indicator gauge, a current regulator, a current regulation indicator gauge, a phase connection/disconnection display device, a fuel gas pressure gauge, an air pressure gage, a fuel gas flow meter and an air flow meter, and is characterized by further including the computer installed with control software; the fuel gas flow meter, the air flow meter, the fuel gas pressure gauge, the air pressure gauge, the voltage regulation indicator gauge, the current regulation indicator gauge and the phase connection/disconnection display device are all provided with communication interfaces and in communication connection with the computer; both the fuel gas regulating valve and the air regulating valve are electric control valves and act as per control signals output by the computer respectively; and the voltage regulator and the current regulator act as per control signals output by the computer respectively. Through adopting the cable flame-retardant combustion test device, the testing process is automatically and precisely controlled by the computer, the testing result is more accurate and reliable, the efficiency is high, and the original testing data can be stored.

The invention relates to the technical field of shoe detection equipment, in particular to a shoe sole skid resistance tester. The shoe sole skid resistance tester comprises a workbench, a friction component, a first drive mechanism, a clamp component and a second drive mechanism, wherein the friction component for skid resistance testing is slidably arranged on the workbench and used for being abutted against a sample shoe clamped by the clamp component, the first drive mechanism is used for driving the friction component to move in a reciprocating manner, the clamp component for clamping theexternal sample shoe is arranged on the workbench and used for regulating the angle between the sample shoe and the friction component, and the second drive mechanism is used for driving the clamp component to move. The shoe sole skid resistance tester is simple in structure, wide in application range, diversified in testing media and testing modes, capable of regulating the angle between soles and the testing media according to different factors such as the testing media, shoes and road surface contacting manners, capable of achieving testing results conforming to actual situations and accurate in skid resistance data.

The invention discloses bridge maintenance equipment, which comprises a power connection box and a power connection plug. The left side of the power connection box is provided with a plurality of suspension arms. Each suspension arm is provided with a suspension hole. The end surface at the right side of the power connection box is provided with an embedded groove. The power connection box above the embedded groove is provided with a first slide cavity. The power connection box at the left side of the embedded groove is provided with a second slide cavity. The inner side at the left side of the embedded groove is provided with a power connection groove. The second slide cavity is internally provided with a first spiral rod in left and right extension arrangement. The left end of the first spiral rod is connected with a first motor. The first spiral rod is spirally cooperated with a slide block. The bottom portion at the right side of the slide block is provided with a connecting rod in right-side extension arrangement. An extension section at the right side of the connecting rod extends into the embedded groove, and the tail portion thereof is fixedly provided with a joint device. The bridge maintenance equipment is simple in structure and convenient to operate, can realize automatic locking and positioning of the power connection plug and automatic control of plugging work of the power connection plug, and is high in safety.

The invention discloses a method for fire grate control for a fire grate type garbage incinerator. The method comprises the following steps: receiving the combustion state of the incinerator or the operator command according to the control state of a fire grate, and calculating the latency time of the fire grate returned to the position; according to the preset rule, outputting a starting or stopping command of the fire grate according to the total guard command of a boiler, the operator input order, the position signal of the fire grate and the latency time of the fire grate returned to the position; determining whether the synchronous command is output or not according to the operator command; outputting an advancing or retreating command of the fire grate according to the operator inputorder, the synchronous command and the position signal of the fire grate; and performing logical operation to the starting or the stopping command of the fire grate and the advancing or retreating command of the fire grate to obtain an action command of the fire grate, and then outputting the action command to a fire grate hydraulic system. The invention also discloses a fire grate control devicefor the fire grate type garbage incinerator. By adopting the embodiment of the invention, the automatic control of combustion of the garbage incinerator is realized, and the purposes of rapidness, stability, reliability and security are achieved.

The invention discloses a metal-matrix composite and a preparation method thereof. The metal-matrix composite is sequentially composed of a plastic working layer, a middle combination layer and a metal base body from top to bottom. The plastic working layer comprises, by mass, 30-50% of polybenzoate, 20-40% of polyamide, 20-40% of polytetrafluoroethylene, 8-15% of carbon fiber, 3-7 % of copper powder and 5% of molybdenum disulfide. The middle combination layer comprises, by mass, 40-60% of epoxy resin, 30-50% of polyurethane, 10-20% of alumina powder and 10-20% of silane coupling agent. The metal base body is made of one of 45# steel, aluminum alloy and copper alloy. The metal-matrix composite is high in production efficiency, automatic control can be achieved, efficiency is improved, cost is reduced, and the metal-matrix composite can be suitable for self-lubricating of mechanical device parts under high working temperature, lots of dust, heavy loads and other special working conditions.

Embodiments in the invention provide a garage door system and a control method. The garage door system comprises a communication device, a garage door controlling device and a motion device. The communication device is communicated with a vehicle to enter a garage; the garage door controlling device analyzes communication results, and then the motion device is controlled to realize opening and closing of a garage door; thus, intelligent control of the garage door is realized, and user experience is improved.

The invention discloses a miniature electrical liquid controller without a tank which comprises a control system and a hydraulic system. The control system comprises a displacement sensor, an electromagnetic valve, an explosion-proof motor, a signal isolator, a solid state relay and a control circuit. The hydraulic system comprises a pump, a check valve, a filter, an air filter, an overflow valve, a pressure gauge, a hydraulic lock, an electromagnetic valve, a stop valve, a flow speed control valve and a hydraulic actuator. The controller is characterized in that whether the electromagnetic valve obtains electricity or not is precisely controlled by a programmable controller PLC. The controller provided by the invention employs the supercharging mode of kinetic energy transmission between hydraulic oil in a transmission system to get driving energy required by the system to solve the problem of controlling the opening and closing of the valve. The purpose that the valve is opened or closed through small space and small kinetic energy is reached and the automation control of the valve is realized. The controller provided by the invention has the advantages of stable operation, reliable work, small volume, high precision, convenient operation and low price.

The invention discloses a tempered sponge brick produced by using urban construction garbage by a method of treating waste with waste. Residual mud muck and construction garbage are used as base materials; greening garbage and waste wood organic matters are dried and then are used as internal combustion fuel and combustion-supporting gas; and a tempered sponge agent and a large-size vibration prop vertical kiln are used for producing the tempered sponge brick. The method has the advantages that the waste is treated with the waste, a small-size vertical kiln is changed into a large size, the brick strength is high, the porosity is great, the energy is saved and the emission is reduced and the like; and the tempered sponge brick is suitable for being widely applied to urban construction.

The invention provides a scrap electric wire peeling apparatus. The apparatus comprises a pedestal, a control mechanism, a clamping mechanism and a cutting mechanism, wherein the control mechanism, the clamping mechanism and the cutting mechanism are located on the pedestal. The clamping mechanism comprises a shell, a gear shaft 1, a gear shaft 2, a clamping block 1 and a clamping block 2. The shell comprises a base plate, a top board and four side plates which are extended upwardly from edges of the base plate. A central section of the top board is provided with an opening. The opening horizontally and vertically passes through the top board. The gear shaft 1 and the gear shaft 2 are symmetrically installed about the opening in the shell. The two gear shafts are engaged and an axis direction is the same with a direction of the opening. A track is symmetrically arranged about the opening in an inner side of the top board. The clamping block 1 and the clamping block 2 are arranged on the track respectively. Bottom surfaces of the clamping block 1 and the clamping block 2 are provided with teeth. The clamping block 1 and the clamping block 2 are engaged with the gear shaft 1 and the gear shaft 2 through the teeth respectively.

The invention discloses a full-automatic control system for a water purification plant. The full-automatic control system comprises an effluent detection device, a service water detection device, a flocculant preparing and dosing system, a disinfecting system, a sludge discharge system and a back-flushing system. The full-automatic control system for the water purification plant disclosed by the invention is suitable for municipal water supply network, and is capable of controlling switching of water purification equipment depending on real-time water service data from water supply network of a user and capable of automatically calculating dosing amounts of a flocculant and a disinfectant depending on water supply amount and working condition in real time, so as to realize automatic control of a large water supply system.

The invention discloses a method for controlling an electronic expansion valve in an air conditioner system. The method includes the steps that firstly, the electronic expansion valve is started and initialized, the air sucking temperature of a compressor and the valve back temperature of the electronic expansion valve are detected in real time, and the practical superheat degree of the electronic expansion valve is calculated according to the difference of the air sucking temperature of the compressor and the valve back temperature of the electronic expansion valve; the target overheat degree of the electronic expansion valve is set according to the inlet water temperature value of an evaporator and the changing trend of the temperature; the practical overheat degree is compared with the target overheat degree, and the optimal opening degree range of the electronic expansion valve is determined through a closed-loop control system. The method has the advantages that by means of the scheme, the practical overheat degree can be calculated by the system, the practical overheat degree is compared with the set target overheat degree, and the optimal opening degree range is determined. The control method is simplified, the equipment cost is reduced, automatic control over the refrigerant flow and the throttling degree can be achieved, and reliable and safe operation of the equipment system is protected.