31results about How to "Avoid repeated start and stop" patented technology

The invention discloses an intrinsically safe inerting protection method and an intrinsically safe inerting protection device for an oil storage tank, relates to a method and a device for active fire and explosion prevention of the oil storage tank, and aims to solve the problem of fire and explosion prevention of the oil storage tank. The method comprises the following steps: a, performing inerting on each oil tank in sequence to ensure that each oil tank achieves an inexplosive condition, namely, the oxygen concentration of gas in the tank is lower than 10 percent; b, detecting the pressure of a pipe network for supplying inert gas to the oil tank, and supplying the inert gas to the pipe network and inputting the inert gas to the oil tank through the pipe network if the pressure is lower than a set lower limit value; c, detecting the pressure of the pipe network for supplying the inert gas to the oil tank, emitting the inert gas in the pipe network if the pressure exceeds a set upper limit value; and d, detecting the oxygen concentration in the pipe network for supplying the inert gas to the oil tank, and repeating the step a if the concentration exceeds the set upper limit value. The device comprises a buffer device, a breathing pipe network, a first pressure transmitter, a second pressure transmitter, an online oxygen analyzer and an electric control device.

The invention discloses a control method for an air-conditioning system. The control method comprises the following steps: starting up a compressor while meeting a preset condition; within a preset detecting time range, controlling the compressor to stop when the current environment temperature is within the preset temperature range and an operation current value of the air-conditioning system is not smaller than a set current value; controlling the compressor to stop when the current environment temperature exceeds the preset temperature range and the operation current value is not smaller than the set current value, and re-starting the compressor after the first time; then, controlling the compressor to stop when the operation current value is not smaller than the set current value and a pressure value of a gas exhaustion tube of the compressor exceeds a preset range. The control method for the air-conditioning system disclosed by the invention can be used for controlling the compressor to stop when the operation current of the air-conditioning system is overhigh due to faults, so that the compressor is no longer started before the faults are removed, the phenomenon of repeatedly starting and stopping the compressor is avoided, and the damage probability of the compressor is reduced. The invention further discloses an air-conditioning system and a control device thereof.

This is a water supply method at entire flow rate and high efficient speed adjustment by frequency conversion. Divide the area into different districts in vertical first and figure out lift difference among the districts. Then decide the numbers and total flow rate of pumps in large capacity and small capacity. Set the pump's speed adjustment scopes and start-stop configures and restrict the low limits of pump's high frequency and pressure of pipe networks. The air pressing water supply tank, small capacity pump and large capacity pump are started in order, water flow rate changes from high to low, frequency conversion pumps are closed in order as the manner of large capacity pumps starting, running at decreasing frequency, small capacity pumps starting near to large ones low limitation, both large and small ones stop at reaching their low limitation. This method keeps the pumps working at high efficiency period during all water supply time and avoids repeating start and stop.

The invention discloses a waste heat blowing control method of an air conditioner. The waste heat blowing control method of the air conditioner includes the steps that whether the air conditioner meets first set conditions and second set conditions or not is judged; if yes, an indoor fan operates to blow waste heat; the first set conditions comprise that an indoor unit operates in a heating mode, the temperature of a heat exchanger coil pipe of the indoor unit is larger than or equal to a waste heat blowing entering temperature value, and the rotation speed of the indoor fan is larger than a rotation speed set value; and the second set conditions comprise that the indoor unit is stopped or the indoor environment temperature is larger than or equal to a set temperature or a compressor is stopped. According to the waste heat blowing control method of the air conditioner, judgment of the rotation speed of the indoor fan is added to the entering conditions of waste heat blowing, and waste heat blowing is carried out only when the rotation speed of the indoor fan is larger than the rotation speed set value and other conditions are met. The problems that the indoor fan is repeatedly operated and stopped and the indoor fan blows waste heat firstly when the air conditioner is started for heating are solved, the situation that the indoor fan is repeatedly started and stopped due to waste heat blowing is avoided, the quality and competiveness of the air conditioner are improved, and user experience is improved.

The invention discloses a control method and device for an air conditioner. The air conditioner comprises an outdoor unit, an indoor unit and N branch circuits connected in parallel, wherein N is an integer greater than one, and the outdoor unit is connected with the indoor unit through the N branch circuits connected in parallel. The air conditioner runs in a refrigeration mode. The method comprises the following steps of recognizing that an air conditioner compressor runs according to the smallest running frequency; obtaining target running frequency of the air conditioner; and if the targetrunning frequency is smaller than a first preset value, controlling more branch circuits of the N branch circuits connected in parallel to be switched on. By means of the control method and device for the air conditioner, the technical problem that when an air conditioner runs according to the smallest frequency, output refrigeration capacity is greater than actual indoor required refrigeration capacity in the prior art is effectively solved.

The invention belongs to the technical field of surveying and mapping based on an unmanned aerial vehicle, and discloses an image control point information acquisition method based on the unmanned aerial vehicle and an image control point information acquisition system based on the unmanned aerial vehicle. By the acquisition method disclosed by the invention, information acquisition is performed in a way of not landing the unmanned aerial vehicle, and elevation photography is synchronously achieved; a geographic image is combined with data information to form a visually-viewable three-dimensional geographic model; in such a manner, not only the efficiency of the surveying and mapping based on the unmanned aerial vehicle is improved, but also the quality of the surveying and mapping based on the unmanned aerial vehicle is improved, so that the combination of field working and interior working is closer. The acquisition system provided by the invention performs geographical information surveying and mapping through the unmanned aerial vehicle to generate a three-dimensional geographic surveying and mapping model; the three-dimensional model generated by the acquisition system is intuitive and sensible, and has higher using reference. Therefore, the acquisition method and the acquisition system are suitable for popularization and use.

The invention discloses an air conditioner control method and device. An air conditioner runs in a refrigeration mode. The method comprises the following steps that it is recognized that a compressorin the air conditioner runs according to the lowest running frequency; the target running frequency of the air conditioner at the current moment is obtained; if the target running frequency is lower than the lowest running frequency, the outdoor temperature and the indoor temperature are obtained; the target inlet temperature of an evaporator is obtained according to the outdoor temperature and the indoor temperature; and according to the target inlet temperature of the evaporator, the opening degree of an electronic expansion valve is adjusted. The technical problem that in the prior art, when an air conditioner runs with the lowest frequency, the output refrigerating capacity is larger than the indoor actual required cooling capacity is effectively solved.

The invention discloses a high-speed centrifugal compressor based on gas suspension. The high-speed centrifugal compressor based on gas suspension comprises a shell unit, an impeller unit and a transmission unit, wherein the shell unit is used for protecting an internal structure of a compressor body, the impeller unit comprises an impeller and an impeller housing, the impeller can be driven to rotate by a rotary shaft, a shaft of the transmission unit is fixedly installed on the impeller, and electric current is applied to a stator winding to drive the shaft to rotate. The transmission unit comprises a tilting bush radial bearing and a tilting bush thrust bearing. The tilting bush radial bearing comprises a PZT, a straight beam, a flexible web and a tilting bush. Voltage is applied to thePZT to make the tilting bush generate high-frequency vibration, and gas film is formed between the tilting bush radial bearing and the shaft, and between the tilting bush thrust bearing and the a thrust plate to provide supporting. The compressor body is lubricated by air without supplied oil for lubrication, and the conversion efficiency of equipment is high; the bearings make no direct contactwith the shaft, the service life of a product is long, and repeated starting and stop can be achieved; a system can be kept running at a high speed stably by controlling voltage; and no supply of static pressure external gas is needed, and the compressor can be used in a device which moves at any time.

The invention provides a photovoltaic inverter auxiliary power supply and a start-stop control method. The photovoltaic inverter auxiliary power supply is characterized in that an input terminal of a rectification circuit is connected to a power grid connected to an inverter of the photovoltaic inverter auxiliary power supply; an output terminal of the rectification circuit is connected to a first input terminal of a conversion circuit; an output terminal of the conversion circuit is connected to each equipment in the inverter of the photovoltaic inverter auxiliary power supply; a first input terminal of an enable circuit is connected to an output terminal of a photovoltaic assembly; an output terminal of the enable circuit is connected to a first input terminal of a control circuit; an output terminal of the control circuit is connected to a second input terminal of the conversion circuit; and the rectification circuit converts an alternating voltage acquired from the power grid into a direct voltage and outputs the direct voltage to the first input terminal of the conversion circuit. In the invention, by using the photovoltaic inverter auxiliary power supply, a repeated start-stop condition can be avoided when illumination is insufficient so that a condition that the photovoltaic inverter is started and stopped repeatedly because a needed voltage is insufficient is avoided.

The invention discloses an intrinsically safe inerting protection method and an intrinsically safe inerting protection device for an oil storage tank, relates to a method and a device for active fire and explosion prevention of the oil storage tank, and aims to solve the problem of fire and explosion prevention of the oil storage tank. The method comprises the following steps: a, performing inerting on each oil tank in sequence to ensure that each oil tank achieves an inexplosive condition, namely, the oxygen concentration of gas in the tank is lower than 10 percent; b, detecting the pressure of a pipe network for supplying inert gas to the oil tank, and supplying the inert gas to the pipe network and inputting the inert gas to the oil tank through the pipe network if the pressure is lower than a set lower limit value; c, detecting the pressure of the pipe network for supplying the inert gas to the oil tank, emitting the inert gas in the pipe network if the pressure exceeds a set upper limit value; and d, detecting the oxygen concentration in the pipe network for supplying the inert gas to the oil tank, and repeating the step a if the concentration exceeds the set upper limit value. The device comprises a buffer device, an inlet end of which is to receive the inert gas, and an outlet end of which is connected to a breathing pipe network through a control valve; a first pressure transmitter mounted on the buffer device; the breathing pipe network communicated with the oil tank through an intake stop valve; a second pressure transmitter; an online oxygen analyzer mounted on the breathing pipe network; and an electric control device electrically connected to the first pressure transmitter, the second pressure transmitter, the online oxygen analyzer and the control valve.

The invention provides a power battery cooling system, a control method and a vehicle. The system comprises a battery heat dissipation system and an air conditioning system, wherein the battery heat dissipation system includes a battery system, a coolant cooler, a water pump and a battery radiator which are connected in turn by a coolant pipeline, the coolant cooler is provided with a coolant accommodating layer and a refrigerant accommodating layer, the coolant accommodating layer is connected with the coolant pipeline, and the battery heat dissipation system carries out water cooling on a battery system; and an air outlet of the air conditioning system is selectively connected with the battery system so as to carry out air cooling on the battery system when being connected with the battery system, a refrigerant pipeline of the air conditioning system is selectively connected with the refrigerant accommodating layer so as to carry out cooling on a refrigerant in the refrigerant accommodating layer when being connected with the refrigerant accommodating layer. The power battery cooling system provided by the invention can effectively reduce the temperature of a power battery and has the advantage of low energy consumption.

The invention discloses a safety control system of an AGV. The system comprises a vehicle collision sensor which emits a collision signal the moment that a vehicle collision motion is detected; a sudden stop unlocking device which outputs an unlocking signal according to a received instruction to stop a vehicle sudden stop state; and a sudden stop control circuit which maintains output of the sudden stop signal after that the collision signal is received and stops response to change of subsequent collision signals unless the unlocking signal is input. The safety control system can prevent theAGV from repeated start / stop due to input fluctuation of the collision signal caused by vibration after collision, and the safety control system of the AGV is more reliable and more stable.

The invention discloses a control method for a heat pump system, the heat pump system and an air conditioner. The control method for the heat pump system comprises the following steps: judging whether a heat recovery mode is allowed to run according to the temperature of a heat recovery medium which is to be subjected to heat exchange with a refrigerant, and / or, when the heat recovery mode is allowed to run, controlling a compressor in a refrigerant circulating loop to start / stop according to the temperature of the heat recovery medium which is to be subjected to heat exchange with the refrigerant. According to a control method for a heat recovery device, whether the heat recovery mode is allowed to run and whether the compressor is started / stopped are controlled by the temperature of the heat recovery medium. By actively inhibiting the heat recovery device from running or actively stopping the compressor, the running stability of the heat pump system cannot be influenced by excessively high or excessively low temperature of the heat exchange medium, or the phenomenon that the compressor is repeatedly started / stopped is prevented. Not only can the running stability and comfort of the heat pump system be guaranteed, but also the stability of the heat recovery function is ensured, and domestic hot water is provided for users.

The invention discloses an air conditioner control method and device. The air conditioner includes an outdoor unit, an indoor unit and N branches connected in parallel, wherein N is an integer greater than 1, and the outdoor unit passes through the N branches connected in parallel. The road is connected to the indoor unit, and the air conditioner operates in cooling mode. The method includes the following steps: identifying that the air conditioner compressor operates at the lowest operating frequency; obtaining the target operating frequency of the air conditioner; if the target operating frequency is less than the first preset Set the value, control and increase the opening of the N branches connected in parallel, effectively solve the technical problem in the prior art that the output cooling capacity of the air conditioner is greater than the actual cooling capacity required in the room when the air conditioner operates at the lowest frequency.

The invention discloses a control method for an air-conditioning system. The control method comprises the following steps: starting up a compressor while meeting a preset condition; within a preset detecting time range, controlling the compressor to stop when the current environment temperature is within the preset temperature range and an operation current value of the air-conditioning system is not smaller than a set current value; controlling the compressor to stop when the current environment temperature exceeds the preset temperature range and the operation current value is not smaller than the set current value, and re-starting the compressor after the first time; then, controlling the compressor to stop when the operation current value is not smaller than the set current value and a pressure value of a gas exhaustion tube of the compressor exceeds a preset range. The control method for the air-conditioning system disclosed by the invention can be used for controlling the compressor to stop when the operation current of the air-conditioning system is overhigh due to faults, so that the compressor is no longer started before the faults are removed, the phenomenon of repeatedly starting and stopping the compressor is avoided, and the damage probability of the compressor is reduced. The invention further discloses an air-conditioning system and a control device thereof.

The invention relates to the field of air purification, in particular to a control method applied to an air purification system, a terminal and a storage medium, and can solve the problem that a purification device in the prior art cannot specifically eliminate environmental pollution. The control method comprises the steps that S0, the space where the air purification system is located is divided into a plurality of subspaces, and spatial data of at least one subspace is obtained; and step S1: according to the spatial data, matching a purification device corresponding to the subspace to work. According to the air purification system, the purification devices corresponding to the subspaces can be matched to work according to the obtained space data, such as pollution source data or pollution index data, of the space where the air purification system is located, and the multiple purification devices are used for working in different areas, so that targeted purification can be carried out, and the purification efficiency is greatly improved.

This is a water supply method at entire flow rate and high efficient speed adjustment by frequency conversion. Divide the area into different districts in vertical first and figure out lift difference among the districts. Then decide the numbers and total flow rate of pumps in large capacity and small capacity. Set the pump's speed adjustment scopes and start-stop configures and restrict the low limits of pump's high frequency and pressure of pipe networks. The air pressing water supply tank, small capacity pump and large capacity pump are started in order, water flow rate changes from high to low, frequency conversion pumps are closed in order as the manner of large capacity pumps starting, running at decreasing frequency, small capacity pumps starting near to large ones low limitation, both large and small ones stop at reaching their low limitation. This method keeps the pumps working at high efficiency period during all water supply time and avoids repeating start and stop.

The invention discloses a control method for a heat pump system, the heat pump system and an air conditioner. The control method for the heat pump system comprises the following steps: judging whether a heat recovery mode is allowed to run according to the temperature of a heat recovery medium which is to be subjected to heat exchange with a refrigerant, and / or, when the heat recovery mode is allowed to run, controlling a compressor in a refrigerant circulating loop to start / stop according to the temperature of the heat recovery medium which is to be subjected to heat exchange with the refrigerant. According to a control method for a heat recovery device, whether the heat recovery mode is allowed to run and whether the compressor is started / stopped are controlled by the temperature of the heat recovery medium. By actively inhibiting the heat recovery device from running or actively stopping the compressor, the running stability of the heat pump system cannot be influenced by excessively high or excessively low temperature of the heat exchange medium, or the phenomenon that the compressor is repeatedly started / stopped is prevented. Not only can the running stability and comfort of the heat pump system be guaranteed, but also the stability of the heat recovery function is ensured, and domestic hot water is provided for users.

The invention discloses an air conditioner control method and device. The air conditioner operates in a cooling mode, and the method includes the following steps: identifying that the compressor in the air conditioner operates at the lowest operating frequency; obtaining indoor temperature and indoor preset temperature; If the indoor temperature is less than the preset temperature, obtain the outdoor temperature; obtain the target inlet temperature of the evaporator according to the outdoor temperature and the indoor temperature; adjust the electronic expansion valve according to the target inlet temperature of the evaporator The opening degree effectively solves the technical problem in the prior art that the output cooling capacity of the air conditioner is greater than the actual indoor cooling capacity when the air conditioner operates at the lowest frequency.

The invention discloses an automatic material feeding device for numerical control automatic plate processing. The automatic material feeding device comprises a first conveying frame and a second conveying frame, wherein L-shaped supporting frames are installed on the front faces and the back faces of the first conveying frame and the second conveying frame correspondingly, a movable conveying frame is in lap joint with the opposite faces of the first conveying frame and the second conveying frame, and a backflow conveying frame is fixedly connected between the two L-shaped supporting frames of the first conveying frame through a supporting plate. According to the automatic material feeding device for the numerical control automatic plate processing, by means of the arrangements of the three separated conveying frames, a supporting table, a servo motor and a screw rod, defective plates are conveyed back through the backflow conveying frame to be processed again, and the problems that a conveying belt needs to be repeatedly started and stopped when the defective plates are traditionally solved, and the defective plates need to be manually carried are effectively solved; and automatic backflow of the defective plates is achieved through up and down displacement of the movable conveying frame, the automation degree is high, the burden of workers is reduced, repeated starting and stopping of the conveying belt are avoided, the service life of the conveying belt is prolonged, and the material feeding efficiency is improved.

The present invention discloses a protective adjustment method, a device and an air conditioning system of a compressor. The method and the device are used for protective adjustment of the compressor of the air conditioning system. Particularly, the method includes firstly acquiring operating parameters of the compressor; judging the operating parameters and judging that the compressor is in a bad condition when the operating parameters meet the preset judgment conditions; lowering working frequency of the compressor in the preset adjustment mode according to the operating parameters when the compressor is judged to be in a bad condition. It can be seen that in this embodiment, the compressor is directly controlled so that the compressor can quickly get rid of the harsh conditions, thus avoiding repeated start and stop of the air conditioning system caused by slow control of the traditional adjustment mode and thereby avoiding breakdown of the air conditioning system due to repeated start and stop.

The invention discloses a water pump starting method and a water pump. The method comprises the following steps: collecting the descending rate information of the pressure of the water pump; judging the water consumption condition of a user according to the descending rate information; and starting the water pump in a preset mode according to the water consumption condition. According to the water consumption condition, the water pump is started according to the preset mode, water consumption blockage caused by repeated starting and stopping of the water pump is avoided, and the water consumption experience is better when a client opens a faucet.

The invention discloses a regulation control method for a cooling fan of a switch cabinet, and the regulation control method is applied to a cooling fan system. The cooling fan system comprises a temperature probe, a first set of fans and a second set of fans, and the temperature probe, the first set of fans and the second set of fans are installed at the same area. According to the method, after the current of the switch cabinet and ambient temperature are monitored, graded regulation control over the first set of fans and the second set of fans is achieved, and the refrigerating capacity of the fans is regulated; repeated start and stop of the fans are avoided, and the situation that the fans continuously run at high load even when the fans are not needed is avoided; therefore, the service life of the fans is prolonged; furthermore, by setting the first preset time before the first group of fans are stopped and the second preset time before the second group of fans are stopped, delayed shutdown of the fans is realized; and the possibility of damage due to frequent start and stop of the fans is further reduced.

The invention discloses a nuclear power plant charging pump oil circuit control system and a control method thereof. The nuclear power plant charging pump oil circuit control system comprises a charging pump, a charging pump oil circuit, an auxiliary oil pump, multiple pressure switches arranged on the charging pump oil circuit and a main controller; the pressure switches can trigger correspondingswitching value signals according to set conditions; and the main controller comprises a first front delay module, a charging pump starting state signal collecting module, a first signal collecting module, a first judging module and a stopping auxiliary oil pump module. According to the nuclear power plant charging pump oil circuit control system and the control method thereof, in the charging pump starting process, through delay and pulse control design of charging pump starting state signals, the oil pressure established by the auxiliary oil pump is more stable; and in addition, it can be effectively guaranteed that the charging pump is lubricated more fully in the starting stage, and repeated starting and stopping of the auxiliary oil pump can be avoided.

The invention provides a photovoltaic inverter auxiliary power supply and a start-stop control method. The photovoltaic inverter auxiliary power supply is characterized in that an input terminal of a rectification circuit is connected to a power grid connected to an inverter of the photovoltaic inverter auxiliary power supply; an output terminal of the rectification circuit is connected to a first input terminal of a conversion circuit; an output terminal of the conversion circuit is connected to each equipment in the inverter of the photovoltaic inverter auxiliary power supply; a first input terminal of an enable circuit is connected to an output terminal of a photovoltaic assembly; an output terminal of the enable circuit is connected to a first input terminal of a control circuit; an output terminal of the control circuit is connected to a second input terminal of the conversion circuit; and the rectification circuit converts an alternating voltage acquired from the power grid into a direct voltage and outputs the direct voltage to the first input terminal of the conversion circuit. In the invention, by using the photovoltaic inverter auxiliary power supply, a repeated start-stop condition can be avoided when illumination is insufficient so that a condition that the photovoltaic inverter is started and stopped repeatedly because a needed voltage is insufficient is avoided.

The invention relates to the technical field of household appliances, and discloses a humidifying device. The humidifying device comprises a first moisture absorption channel, a humidifying channel and a second moisture absorption channel which are adjacent in sequence; a fan cavity which is adjacently arranged between the first moisture absorption channel and the second moisture absorption channel and communicates with the first moisture absorption channel and the second moisture absorption channel; a moisture absorption module which is configured to reciprocate among the first humidifying channel, the moisture absorption channel and the second moisture absorption channel, absorb moisture in the moisture absorption channel and release moisture in the humidifying channel; sealing baffle plates which are arranged at two ends of the moisture absorption module and are configured to seal the moisture absorption channel and the fan cavity when the moisture absorption module moves to the position between the moisture absorption channel and the fan cavity; and a fan device which is arranged in the fan cavity and is configured to discharge gas in the fan cavity. In the application, the fan is prevented from being started and stopped repeatedly, so that the service life of the fan is prolonged, and moreover, the use amount of the fan is reduced, the cost is saved, and the energy-saving and environment-friendly effects are realized. The invention further discloses an air conditioner.

The invention belongs to the technical field of coke oven temperature measurement, specifically relates to a coke oven temperature measurement robot that does not need to start and stop repeatedly, and overcomes the defects of severe work environment, many human factors, long time interval, poor measurement accuracy and the like in an existing coke oven temperature measurement process. The coke oven temperature measurement robot includes a carrier part, a mobile temperature measurement part and a power and detection part, the carrier part is movably mounted on the top surface of a coke oven, the mobile temperature measurement part is movably mounted on the carrier part and the motion trail is located in the upper side space of a coke oven fire detection hole, and the mobile temperature measurement part has a process of passing through the fire detection hole and maintaining static relative to the fire detection hole in the coke oven top surface movement process. The coke oven temperature measurement robot that does not need to start and stop repeatedly adopts whole-course automatic control, does not need manual operation, greatly reduces labor intensity of workers, and improves accuracy of coke oven temperature measurement.

The invention discloses an alarm device for water seepage at the top of an underground project, which comprises a mounting plate, a water-absorbing pad is embedded in the upper end of the mounting plate, a water storage tank is opened on the mounting plate, and a symmetrical seal is inserted on the outer wall of the water storage tank. A conductive detection head is provided, a detection cover is provided on the mounting plate, a warning light is installed at the lower end of the detection cover, the detection cover includes a detection cavity and a power cavity, and the inner bottom wall of the detection cavity is fixedly installed There is a water pump, and the water pump is respectively equipped with a suction pipe and a drain pipe, and the water suction pipe is inserted to communicate with the water storage tank. In the present invention, the first circuit is conducted through two conductive detection heads, the warning light flickers through the water absorption of the water-absorbing pad and the drainage of the water pump, and the second circuit is formed by self-locking of two ring-shaped metal sheets to realize continuous drainage of large seepage water And continuous alarm, through the distributed installation of multiple devices to achieve the effect of long-term and large-area real-time monitoring and alarm.

The invention discloses an air conditioner control method and device. The air conditioner operates in a cooling mode. The method includes the following steps: identifying that the compressor in the air conditioner operates at the lowest operating frequency; obtaining the target operating frequency of the air conditioner at the current moment; if If the target operating frequency is less than the minimum operating frequency, obtain the outdoor temperature and indoor temperature; obtain the target inlet temperature of the evaporator according to the outdoor temperature and the indoor temperature; adjust the electronic The opening of the expansion valve effectively solves the technical problem in the prior art that the output cooling capacity of the air conditioner is greater than the actual indoor cooling capacity when the air conditioner operates at the lowest frequency.