Method for preventing condensate water from being formed on surface of sensor for detection and air conditioning system

Abstract

The embodiment of the invention provides a method for preventing condensate water from being formed on the surface of a sensor for detection and an air conditioning system. The method at least comprises the steps that a temperature sensor detects the environment temperature; when the environment temperature signal value is lower than a first threshold value K1, the controller sends a first control signal to the switch assembly to enable the switch assembly to be in a first mode, and the heating assembly continuously heats; when the temperature is higher than a second threshold K2 and the heating assembly is in a heating state, a second control signal is sent to the switch assembly to enable the switch assembly to be in a second mode, and the heating assembly keeps not working; when the first threshold value K1 is larger than or equal to the first threshold value K1 and smaller than or equal to the second threshold value K2, a third control signal is sent to the switch assembly to enable the switch assembly to be in a third mode, and the heating assembly works according to the third mode; the probability of condensate water appearing in the detection sensor in the air conditioning system is reduced, and the detection precision and the equipment safety are guaranteed. In addition, different control methods are adopted in different temperature areas, the regulation and control precision is high, and energy is saved.

Description

Technical Field

[0001] The present application relates to the field of refrigeration technology, and in particular to a method for preventing condensed water from forming on the surface of a detection sensor and an air conditioning system. Background Art

[0002] The detection sensors in the air conditioning system, such as refrigerant gas sensors, are prone to condensation when the air conditioning working conditions change. Specifically, it is mainly the changes in factors such as temperature, pressure and / or humidity in the air conditioning environment that cause condensed water to appear in certain locations on the sensors in the air conditioning system. Condensed water refers to liquid water condensed from water vapor in the air when the ambient temperature drops below the dew point temperature, and this process is called condensation. Condensed water on the sensor can easily affect the detection accuracy, and in severe cases, it may drip onto components such as circuit boards in the air conditioning system, causing short circuits or damage. Here, certain locations on the sensor mainly refer to locations where condensation is prone to occur, such as the sensor's detection probe, and if the sensor is a sensor wrapped in an external metal, the metal part is also a location where condensation is prone to occur. Here, the dew point temperature is the critical temperature at which water vapor in the air is converted into condensed water. When the temperature is greater than or equal to this critical temperature, it is water vapor, and when the temperature is less than this temperature, water vapor condenses into liquid water. Summary of the invention

[0003] The present application provides a method for preventing condensation from forming on the surface of a detection sensor and an air conditioning system, which reduces the probability of condensation forming on the detection sensor in the air conditioning system and ensures detection accuracy and equipment safety. In addition, different control methods are used in different temperature zones, which has high control accuracy and energy saving.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] In a first aspect, the present application provides a method for preventing condensation from forming on the surface of a detection sensor, which is applied to an air conditioning system, wherein the air conditioning system comprises a detection sensor, a temperature sensor, a controller, a switch assembly and a heating assembly; the heating assembly is arranged in the detection sensor of the air conditioning system, and the detection sensor and the temperature sensor are arranged under the same environmental conditions;

[0006] Methods include:

[0007] The temperature sensor detects the ambient temperature;

[0008] The controller obtains the ambient temperature signal value detected by the temperature sensor;

[0009] When the ambient temperature signal value is lower than the first threshold value K1, the controller sends a first control signal to the switch component, the switch component is in the first mode, and the heating component continues to heat;

[0010] When the ambient temperature signal value is higher than the second threshold value K2 and the heating component is in a heating state, the controller sends a second control signal to the switch component, the switch component is in a second mode, and the heating component remains inoperative;

[0011] Wherein, if the first mode switch component remains on, the second mode switch component remains off; if the first mode switch component remains off, the second mode switch component remains on;

[0012] When the ambient temperature value Ki is greater than or equal to the first threshold value K1 and less than or equal to the second threshold value K2, the controller sends a third control signal to the switch component to put the switch component in the third mode. The third control signal is a PWM square wave signal, and the duty cycle of the PWM square wave signal is adjusted according to the ambient temperature. The third mode heating component works according to the third mode of the switch component.

[0013] Among them, the third mode is the on and off time obtained by the switch component according to the duty cycle of the PWM square wave signal sent by the controller; the first threshold is less than the second threshold.

[0014] It can be seen from the above technical scheme that a method for preventing condensation from forming on the surface of a detection sensor of the present application, the controller includes sending a first control signal to a switch component when the ambient temperature value is lower than a first threshold value K1, the switch component is in a first mode, and the heating component continues to heat; when the ambient temperature value is higher than a second threshold value K2, sending a second control signal to a second mode and the heating component does not work; when the ambient temperature value Ki is greater than or equal to the first threshold value K1, and less than or equal to the second threshold value K2, sending a third control signal to the switch component, the third control signal is a PWM square wave signal, and the duty cycle of the PWM square wave signal is adjusted according to the ambient temperature, the switch component is in a third mode, and the heating component works according to the third mode of the switch component. The probability of condensation appearing on the detection sensor in the air-conditioning system is reduced, and the detection accuracy and equipment safety are guaranteed. In addition, different control methods are used in different temperature zones, with high regulation accuracy and energy saving.

[0015] In a second aspect, the present application provides an air conditioning system, including a detection sensor, a temperature sensor, a controller, a switch assembly, and a heating assembly; the heating assembly is arranged in the detection sensor of the air conditioning system, and the detection sensor and the temperature sensor are arranged under the same environmental conditions; the temperature sensor can at least be used to detect the ambient temperature;

[0016] The controller can at least be used to obtain the ambient temperature signal value detected by the temperature sensor; when the ambient temperature value is lower than the first threshold value K1, send a first control signal to the switch component; when the ambient temperature value is higher than the second threshold value K2 and the heating component is in a heating state, send a second control signal to the switch component; when the ambient temperature value Ki is greater than or equal to the first threshold value K1 and less than or equal to the second threshold value K2, send a third control signal to the switch component, the third control signal is a PWM square wave signal, and the duty cycle of the PWM square wave signal is adjusted according to the ambient temperature value;

[0017] The switch component can at least be used in a first mode under a first control signal state; in a second mode under a second control signal state; in a third mode under a third control signal state; if the first mode is that the switch component is turned on, the second mode is that the switch component is turned off; if the first mode is that the switch component is turned off, the second mode is that the switch component is turned on; the third mode is the time of on and off obtained by the switch component according to the duty cycle of the PWM square wave signal sent by the controller;

[0018] The heating component continues to heat when the switch component is in the first mode; remains inoperative when the switch component is in the second mode; and operates according to the third mode when the switch component is in the third mode;

[0019] The first threshold is smaller than the second threshold.

[0020] It can be known from the above technical scheme that an air conditioning system of the present application, the controller includes sending a first control signal to the switch component when the ambient temperature is lower than the first threshold value K1, the switch component is in the first mode, and the heating component is heated; sending a second control signal to the switch component when the ambient temperature is higher than the second threshold value K2, the switch component is in the second mode, and the heating component is not heated; sending a third control signal to the switch component when the ambient temperature Ki is greater than or equal to the first threshold value K1, and less than or equal to the second threshold value K2, the third control signal is a PWM square wave signal, and the duty cycle of the PWM square wave signal is adjusted according to the ambient temperature, the switch component is in the third mode, and is turned on and off according to the duty cycle Q of the PWM square wave signal, and the heating component is heated or not heated according to the third mode of the switch component. The probability of condensed water appearing in the detection sensor in the air conditioning system is reduced, and the detection accuracy and equipment safety are guaranteed. In addition, different control methods are adopted for different temperature zones, with high regulation accuracy and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the hardware framework of an air conditioning system provided in an embodiment of the present application;

[0022] Figure 2A flow chart of a method for preventing condensation from forming on the surface of a detection sensor in an air conditioning system is provided for an embodiment of the present application;

[0023] Figure 3 A flow chart of a method for obtaining a duty cycle Q provided in an embodiment of the present application;

[0024] Figure 4 A circuit schematic diagram of an embodiment of a heating component provided by the present application;

[0025] Figure 5 A schematic diagram of the distribution of a heating component provided in an embodiment of the present application;

[0026] Figure 6 A schematic diagram of the relationship between the heating power generated by a heating assembly of different package sizes and the ambient temperature provided in an embodiment of the present application;

[0027] Figure 7 It is a circuit schematic diagram of another embodiment of the heating component provided in the present application. DETAILED DESCRIPTION

[0028] It should be noted that the embodiments described in this application are only part of the embodiments of this application, rather than all the embodiments.

[0029] In view of the problems existing in the background technology, the embodiment of the present application provides a method for preventing condensation water from forming on the surface of a detection sensor, which is applied to an air conditioning system and is described below with reference to the accompanying drawings. Figure 1 The air conditioning system 100 provided in the embodiment of the present application includes at least a detection sensor, a temperature sensor 101, a controller 102, a switch component 103, a heating component 1044 and a detection sensor ( Figure 1 (not shown). The heating component is arranged on the detection sensor in the air conditioning system, and the detection sensor and the temperature sensor are located under the same environmental conditions. Here, the heating component 104 is arranged on the detection sensor. For example, the detection probe of the sensor, or the metal part of the metal-wrapped sensor, is a location where condensation is prone to occur. For example, the sensor here can be a temperature sensor, a refrigerant sensor, a humidity sensor, etc.

[0030] In the embodiment of the present application, the heating component 104 may be a heating film or a heating resistor. For example, the heating film is a polyimide heating film, which is not specifically limited in the embodiment of the present application.

[0031] Attached Figure 2 , a method for preventing condensation from forming on the surface of a detection sensor is provided in the embodiment of the present application, and is applied to the above-mentioned air conditioning system. The method comprises:

[0032] S101: The temperature sensor detects the ambient temperature signal value;

[0033] Here, the ambient temperature signal value detected by the temperature sensor is affected by factors such as humidity and pressure in the environment.

[0034] S103: The controller obtains the ambient temperature signal value detected by the temperature sensor;

[0035] S105: A first threshold value K1 and a second threshold value K2 are preset in the controller.

[0036] Optionally, the controller also pre-sets two thresholds of heating power of the heating component, namely, a first power P1 and a second power P2;

[0037] Here, the first threshold value K1 is less than the second threshold value K2. Setting the threshold value in this way can ensure that condensation can be avoided regardless of the temperature range of the detected ambient temperature signal. First temperature range: less than the first threshold value K1; second temperature range: greater than or equal to the first threshold value K1, less than or equal to the second threshold value K2; third temperature range: greater than the second threshold value K2. In one test method, the first power P1 is the power value when the heating component is turned on, and the second power P2 is the power value of 0 when the heating component is disconnected. Exemplarily, the heating component is in working state, the power supply is normally supplied, and the heating component is working. The first power P1 can be calculated by measuring the current I and voltage V of the heating component in the working state, and P1 = V×I at this time. In the disconnected state, the heating component does not work, and the power P2 = 0 at this time.

[0038] Of course, another test method can be used, where the first power P1 is the power value when the heating component is turned on for time t1, and the second power P2 is the power value when the heating component is turned on for time t2, where t1 is greater than t2. For example, the first power P1 can be calculated by measuring the current I and voltage V of the heating component during the turn-on time t1, using the formula P1=V×I. The second power P2 can be calculated by measuring the current I and voltage V of the heating component during the turn-on time t2, using the formula P2=V×I.

[0039] Based on (K1, P1) and (K2, P2), the controller obtains the mapping relationship between the ambient temperature value Ki and the corresponding heating power Pi.

[0040] The step 105 is subject to the text writing restrictions, and it does not have to be performed after the step S103, and can be performed before the step S101 or the step S103, and is not restricted by the writing order here.

[0041] S1071: The controller sends a first control signal to the switch component at least when the ambient temperature signal value is lower than the first threshold value K1;

[0042] S1091: the switch component is in a first mode under a first control signal state;

[0043] S111: The heating component continues to heat;

[0044] S1072: The controller sends a second control signal to the switch component at least when the ambient temperature signal value is higher than the second threshold value K2 and the heating component is in a heating state;

[0045] S1092: the switch component is in the second mode under the second control signal state;

[0046] S1112: Heating component does not work;

[0047] S1073: The controller sends a third control signal to the switch component at least when the ambient temperature signal value Ki is greater than or equal to the first threshold value K1 and less than or equal to the second threshold value K2;

[0048] The third control signal is a PWM square wave signal, and the duty cycle Q of the PWM square wave signal is adjusted according to the value of the ambient temperature signal, wherein PWM is a pulse width modulation signal. The technical solution of the present application reduces the probability of condensed water appearing in the detection sensor in the air-conditioning system, thereby ensuring the detection accuracy and equipment safety. In addition, different temperature sections adopt different control methods. Specifically, in the first temperature section, the heating component is controlled to be continuously heated, in the second temperature section, the PWM duty cycle is adjusted according to the detected temperature to control the heating time of the heating component, and in the third temperature section, the heating component is controlled not to be heated, so the control accuracy is high and energy saving is achieved.

[0049] Because the dew point temperature is related to environmental factors such as air pressure, temperature and humidity in the current environment, when environmental factors change, the corresponding dew point temperature will also change. Here, the dew point temperature corresponds to a set of fixed first thresholds and second thresholds within a range of variation. Each set of first thresholds and second thresholds can be obtained by R&D personnel based on working environment tests, or can be obtained through theoretical calculations. For example, if the dew point temperature is between T1 and T2, the first threshold K11 and the second threshold K21 are set accordingly. If the dew point temperature is between T3 and T4, the first threshold K12 and the second threshold K22 are set accordingly. The first threshold and the second threshold need to be set in advance before the equipment leaves the factory. In the technical solution of the present application, the current dew point temperature can be calculated by temperature, humidity and / or air pressure, and the controller selects the first threshold and the second threshold corresponding to the current dew point temperature, and then executes the above-mentioned anti-condensation water method.

[0050] like Figure 3 As shown, a method for obtaining a duty cycle Q includes:

[0051] S201: Obtain a curve function f(Ki, Pi) of the ambient temperature signal value Ki and the corresponding heating power Pi through the obtained (K1, P1) and (K2, P2);

[0052] The curve function here can be a straight line function or a quadratic function. Conventional function calculation will not be described here.

[0053] S203: Obtaining the current heating power Pm corresponding to the current ambient temperature value Km through the curve function f(Ki,Pi);

[0054] S205: Substitute the current heating power Pm into the following formula to obtain the duty cycle Q of the PWM square wave signal.

[0055]

[0056] Where V is the voltage applied to the resistor R; n means that the PWM square wave signal has n cycles, and n is a positive integer; T is the cycle time of the PWM square wave signal, and the resistor R is the equivalent resistance of the heating component, so the duty cycle

[0057] Furthermore, if there are multiple heating components at present, namely R1, R2, ...Ri..., i is an integer greater than or equal to 2, and n heating components are connected in parallel, at this time, the current heating power Pm is substituted into the following formula to obtain the duty cycle Q of the PWM square wave signal.

[0058]

[0059] Wherein, resistance Ri is the equivalent resistance of each parallel branch of the heating component.

[0060] Step 201 is limited by the order of writing text, and can actually be in step 1073 or any step in steps 101-105, and is actually not limited by the order of writing. Step 203 only needs to be after step 201, and can be in an interval order or a direct order, and is not limited.

[0061] S1093: the switch component is in a third mode under a third control signal state;

[0062] S113: The heating component operates according to the third mode of the switch component; it should be noted that in the above technical solution, if the first mode is that the switch component is turned on, the second mode is that the switch component is turned off; if the first mode is that the switch component is turned off, the second switch component is turned on. In the third mode, the opening and closing of the switch component is related to the duty cycle of the third control signal PWM square wave.

[0063] The first threshold is smaller than the second threshold.

[0064] For example, if the duty cycle Q is 50%, then within one PWM square wave signal period T, T / 2 period switch components are turned on, and there are T / 2 period switch components that are turned off. Due to the limitation of text writing, steps S1071 to S1093 are not actually executed sequentially. Specifically, in the controller, steps S1071, S1072, and S1073 are parallel steps, and the controller will only select one to execute after receiving the detected ambient temperature signal value. Similarly, steps S1091, S1092, and S1093 are also parallel steps, which actually select the corresponding control mode in sequence after the controller determines and selects one of the steps S1071, S1072, and S1073. For example, if the controller determines that it is currently in step S1071 and the currently detected ambient temperature is in the first temperature zone, step S1091 is executed accordingly.

[0065] In the above-mentioned air conditioning system, the switch component at least includes an insulated-gate bipolar transistor (IGBT) device, the base of the IGBT device is electrically connected to the output end of the controller, the collector is electrically connected to the heating component, the emitter is grounded, and the first resistor R121 is electrically connected between the base and the emitter. The first resistor R121 is used to provide an electrostatic discharge path between the base and the emitter, thereby reducing the voltage between the base and the emitter, and protecting the switch component 103 from electrostatic damage. The base of the IGBT device is turned on in a high level state and turned off in a low level state. In the case of Figure 4 As shown, in one embodiment, if the collector of the IGBT is connected in series with the heating component, the heating component can work and heat when the IGBT device is turned on, and not work when the IGBT device is turned off. Figure 7 As shown in FIG. 1 , if the IGBT device is connected in parallel with the heating component, the heating component does not work when the IGBT device is turned on, and heats when the IGBT device is turned off. Figure 4 As shown, one end of R121 is connected to the base, and the other end is connected to the emitter and the ground GND. Here, the first resistor R121 is an equivalent resistor.

[0066] The number of heating components is greater than or equal to two and they are arranged in parallel.

[0067] An exemplary description is attached Figure 4 As shown, the heating component is illustrated as 5 heating resistors arranged in parallel, namely R116, R117, R118, R119 and R120. One end of the heating component is connected to the DC source VDD, and the other end is connected to the switch component 103.

[0068] Among them: The heating power of each heating resistor is as described in the formula table:

[0069] P R116 =V DD 2 / R116 (1)

[0070] P R117 =V DD 2 / R117 (2)

[0071] P R118 =V DD 2 / R118 (3)

[0072] P R119 =V DD 2 / R119 (4)

[0073] P R120 =V DD 2 / R120 (5)

[0074] It can be seen that the maximum heating power of the heating component provided in the embodiment of the present application is expressed by the following formula:

[0075] P MAX =P R116 + P R117 + P R118 + P R119 + P R120 (6)

[0076] That is, the heating component 104 is formed by connecting n heating resistors in parallel, where n≥2, and the heating power of the heating component can be controlled to vary within the range of 0 to PMAX.

[0077] It is understood that the five heating resistors in the embodiment of the present application are only schematic representations. In actual use, according to actual needs, the number of heating resistors can also be 2, 3, 4, or 6 or more. The embodiment of the present application is not specifically limited. The specific factors to be considered are the resistance value of the heating resistors available on the market and the cost.

[0078] The heating assembly is arranged around the detection probe of the sensor so that the sensor is heated evenly and the heating efficiency is improved. Figure 5 , 5 heating resistors are distributed on the PCB board 1 and located around the sensor probe 2. Therefore, when the heating resistors are working, the temperature of the sensor itself can be made uniform and condensation problem is not easy to occur.

[0079] The package sizes of the heating resistors selected in the embodiment of the present application may be the same, for example, all 0805, or may be different, which is not specifically limited in the embodiment of the present application.

[0080] Since heating resistors of different package sizes have different effects on the temperature increase of the environment in which the sensor is located, even if they generate the same heating power. In order for the heating component to significantly increase the temperature of the environment in which the sensor is located, the heating resistor should be selected with a suitable package size. Therefore, the embodiment of the present application can select the package size of the heating component based on the relationship between the heating power generated by the heating components of different package sizes and the increased ambient temperature. Figure 6 A schematic diagram of the relationship between the heating power generated by a heating component of different packaging sizes and the ambient temperature provided in an embodiment of the present application. Figure 4 The linear relationship between the heating power and the increase in ambient temperature is used as an example for explanation. In actual use, the heating power can also be in a curved relationship with the increase in ambient temperature. Since the working principle is the same, it will not be repeated here.

[0081] like Figure 6 As shown, straight line (1) indicates that the package size of the heating resistor is 0402, and the thermal resistance value is 800K / W (i.e. 800 calvins per watt). Straight line (2) indicates that the package size of the heating resistor is 0603, and the thermal resistance value is 400K / W. Straight line (3) indicates that the package size of the heating resistor is 0805, and the thermal resistance value is 250K / W. Straight line (4) indicates that the package size of the heating resistor is 1206, and the thermal resistance value is 200K / W. Straight line (5) indicates that the package size of the heating resistor is 1210, and the thermal resistance value is 125K / W. Straight line (6) indicates that the package size of the heating resistor is 1218, and the thermal resistance value is 100K / W. Straight line (7) indicates that the size of the heating resistor is 2010, and the thermal resistance value is 80K / W. Straight line (8) indicates that the size of the heating resistor is 2512, and the thermal resistance value is 100K / W. According to Figure 6 As shown in the figure, a heating resistor with a suitable package size can be selected. The heating power generated by the heating resistor can make the ambient temperature rise above the dew point temperature to achieve the anti-condensation effect. Among them, αK / W means that when 1 watt of heat passes through the heating resistor, a temperature difference of α Kelvin will be generated at both ends of the heating resistor.

[0082] It should be noted that each heating resistor in the circuit in the embodiment of the present application can be independent, or it can be an equivalent resistor in which multiple sub-resistors are connected in series / parallel / a mixture of series and parallel, etc., which is not specifically limited in the embodiment of the present application.

[0083] If the detection sensor is a refrigerant sensor, the refrigerant sensor is installed at the air outlet of the air conditioner, preferably at the air outlet, where refrigerant leakage is most likely, or at a location with many welding joints in the air conditioner side pipe, such as the side pipe elbow.

[0084] In the technical solution of this application, the heating component is set on the detection sensor in the air conditioning system, and the detection sensor and the temperature sensor are under the same environmental conditions. The probability of condensation water appearing on the detection sensor in the air conditioning system is reduced, and the detection accuracy and equipment safety are guaranteed. In addition, the temperature zone control is carried out according to the obtained ambient temperature, with high control accuracy and energy saving.

[0085] An embodiment of the present application also provides an air-conditioning system, which includes at least a detection sensor, a temperature sensor, a controller, a switch assembly and a heating assembly; the heating assembly is arranged on the detection sensor in the air-conditioning system, and the detection sensor and the temperature sensor are under the same environmental conditions.

[0086] The temperature sensor can at least be used to detect the ambient temperature;

[0087] The controller can at least be used to obtain the ambient temperature signal value detected by the temperature sensor; when the ambient temperature signal value is lower than the first threshold value K1, send a first control signal to the switch component; when the ambient temperature signal value is higher than the second threshold value K2 and the heating component is in a heating state, send a second control signal to the switch component; when the ambient temperature signal value Ki is greater than or equal to the first threshold value K1 and less than or equal to the second threshold value K2, send a third control signal to the switch component, the third control signal is a PWM square wave signal, and the duty cycle of the PWM square wave signal is adjusted according to the ambient temperature signal value;

[0088] The switch component can be used in a first mode under a first control signal state; in a second mode under a second control signal state; in a third mode under a third control signal state; if the first mode is that the switch component is turned on, the second mode is that the switch component is turned off; if the first mode is that the switch component is turned off, the second mode is that the switch component is turned on; the third mode is the time of on and off of the switch component obtained according to the duty cycle of the PWM square wave signal sent by the controller;

[0089] The heating component continues to heat when the switch component is in the first mode; remains inoperative when the switch component is in the second mode; and operates according to the third mode when the switch component is in the third mode.

[0090] The first threshold is smaller than the second threshold.

[0091] As an optimized implementation of the controller, the controller can at least be used to:

[0092] The heating power of the heating component under the first threshold K1 state is obtained as the first power P1;

[0093] The heating power of the heating component under the second threshold K2 state is obtained as the second power P2;

[0094] According to (K1, P1) and (K2, P2), the curve function f(Ki, Pi) of the ambient temperature signal value Ki and the corresponding heating power Pi is obtained;

[0095] The current heating power Pm corresponding to the current ambient temperature signal value Km is obtained through the curve function f(Ki,Pi);

[0096] Substitute the current heating power Pm into the following formula to calculate the duty cycle Q of the PWM square wave signal;

[0097]

[0098] Wherein, V is the voltage applied to the resistor R; n means that the PWM square wave signal has n cycles, and n is a positive integer; T is the cycle time of the PWM square wave signal.

[0099] In a preferred embodiment, the number of heating components is greater than or equal to two, and they are arranged in parallel.

[0100] Substitute the current heating power Pm into the following to get the duty cycle Q of the PWM square wave signal;

[0101]

[0102] Wherein, V is the voltage applied to both ends of the parallel circuit; n means that the PWM square wave signal has n cycles, and n is a positive integer; T is the cycle time of the PWM square wave signal; and the resistance Ri is the equivalent resistance of each parallel branch of the heating component.

[0103] In the embodiment of the present application, the switch component at least includes an insulated gate bipolar transistor IGBT device, the base of the IGBT device is electrically connected to the output end of the controller, the collector is electrically connected to the heating component, the emitter is grounded, and a first resistor is electrically connected between the base and the emitter.

[0104] In the embodiment of the present application, the heating component at least includes a heating resistor or a heating film.

[0105] In the embodiment of the present application, the number of heating components is greater than or equal to two, and they are arranged in parallel.

[0106] In the embodiment of the present application, the heating component is arranged around the detection probe of the sensor.

[0107] The detection sensor is a refrigerant sensor, which is arranged at the air outlet of the air conditioner or the welding joint of the air conditioner side pipe.

[0108] Since the air conditioning system in this embodiment is an air conditioning system applied by the above-mentioned method for preventing condensation water from forming on the surface of the detection sensor, the relevant contents in the air conditioning system have been explained in detail in the corresponding method part and will not be repeated here.

[0109] In the air conditioning system of the present application, the heating component is arranged on the detection sensor, and the heating time of the heating component is obtained by the on-off control of the switch component, thereby reducing the probability of condensation water appearing on the detection sensor in the air conditioning system, and ensuring the detection accuracy and equipment safety. In addition, the controller can control the heating component according to the temperature zone control based on the obtained ambient temperature, with high control accuracy and energy saving.

[0110] The controller mentioned in all technical solutions of the present application can be a main control chip owned by the air-conditioning system itself, or it can be an independently added small control chip.

[0111] The system architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solution of the present application and do not constitute a limitation on the technical solution of the present application. A person of ordinary skill in the art will appreciate that with the evolution of network architecture and the emergence of new business scenarios, the technical solution of the present application is equally applicable to similar technical problems.

[0112] The above specific examples are used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the methods and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A method for preventing condensation from forming on the surface of a detection sensor, applied to an air conditioning system, characterized in that: The air conditioning system comprises a detection sensor, a temperature sensor, a controller, a switch assembly and a heating assembly; the heating assembly is arranged in the detection sensor of the air conditioning system, and the detection sensor and the temperature sensor are arranged under the same environmental conditions; The method comprises: The temperature sensor detects the ambient temperature; The controller obtains the ambient temperature signal value detected by the temperature sensor; The controller sends a first control signal to the switch component when the ambient temperature signal value is lower than the first threshold value K1, the switch component is in the first mode, and the heating component continues to heat; The controller sends a second control signal to the switch component when the ambient temperature signal value is higher than the second threshold value K2 and the heating component is in a heating state, the switch component is in a second mode, and the heating component remains inoperative; If the first mode is that the switch component remains on, the second mode is that the switch component remains off; if the first mode is that the switch component remains off, the second mode is that the switch component remains on; The controller sends a third control signal to the switch component when the ambient temperature signal value Ki is greater than or equal to the first threshold value K1 and less than or equal to the second threshold value K2, so that the switch component is in a third mode, the third control signal is a PWM square wave signal, and the duty cycle of the PWM square wave signal is adjusted according to the ambient temperature. In the third mode, the heating component works according to the third mode of the switch component; The third mode is the on and off time of the switch component obtained according to the duty cycle of the PWM square wave signal sent by the controller; the first threshold is less than the second threshold.

2. The method for preventing condensed water from forming on the surface of a detection sensor according to claim 1, characterized in that: The method for obtaining the duty cycle Q includes: The heating power of the heating component under the first threshold value K1 is obtained to be the first power P1; The heating power of the heating component under the second threshold value K2 is obtained to be the second power P2; According to (K1, P1) and (K2, P2), the curve function f(Ki, Pi) of the ambient temperature signal value Ki and the corresponding heating power Pi is obtained; The current heating power Pm corresponding to the current ambient temperature signal value Km is obtained through the curve function f(Ki,Pi); Substitute the current heating power Pm into formula (1) to calculate the duty cycle Q of the PWM square wave signal; Wherein, V is the voltage applied to the resistor R; n represents that the PWM square wave signal has n cycles, and n is a positive integer; T is the cycle time of the PWM square wave signal; and the resistor R is the equivalent resistance of the heating component.

3. The method for preventing condensed water from forming on the surface of a detection sensor according to claim 2, characterized in that: The number of the heating components is greater than or equal to two, and they are arranged in parallel.

4. The method for preventing condensed water from forming on the surface of a detection sensor according to claim 3, characterized in that: Substituting the current heating power Pm into formula (2) obtains the duty cycle Q of the PWM square wave signal; Wherein, V is the voltage applied to both ends of the parallel circuit; n means that the PWM square wave signal has n cycles, and n is a positive integer; T is the cycle time of the PWM square wave signal; and the resistance Ri is the equivalent resistance of each parallel branch of the heating component.

5. The method for preventing condensed water from forming on the surface of a detection sensor according to any one of claims 1 to 4, characterized in that: The switch component comprises an insulated gate bipolar transistor (IGBT) device, the base of the IGBT device is electrically connected to the output end of the controller, the collector is electrically connected to the heating component, the emitter is grounded, and a first resistor is electrically connected between the base and the emitter.

6. The method for preventing condensation water from forming on the surface of a detection sensor according to claim 5, characterized in that: The detection sensor is a refrigerant sensor, and the refrigerant sensor is arranged at an air outlet of an air conditioner or at a location with many welding joints of an air conditioner side pipe.

7. The method for preventing condensed water from forming on the surface of a detection sensor according to claim 1, characterized in that: The air conditioning system also includes a humidity sensor for detecting ambient humidity; The dew point temperature is obtained at least through the ambient temperature signal value and the ambient humidity signal, and the dew point temperature corresponds to a set of fixed first thresholds and second thresholds within a variation range; the variation range of the dew point temperature and the corresponding first thresholds and second thresholds are pre-set in the controller.

8. An air conditioning system, characterized in that: It includes a detection sensor, a temperature sensor, a controller, a switch component and a heating component; the heating component is arranged in the detection sensor of the air conditioning system, and the detection sensor and the temperature sensor are arranged under the same environmental conditions; The temperature sensor can at least be used to detect the ambient temperature; The controller can at least be used to obtain the ambient temperature signal value detected by the temperature sensor; when the ambient temperature signal value is lower than the first threshold value K1, send a first control signal to the switch component; when the ambient temperature signal value Ki is higher than the second threshold value K2 and the heating component is in a heating state, send a second control signal to the switch component; when the ambient temperature signal value Ki is greater than or equal to the first threshold value K1 and less than or equal to the second threshold value K2, send a third control signal to the switch component, the third control signal is a PWM square wave signal, and the duty cycle of the PWM square wave signal is adjusted according to the ambient temperature; The switch component can be used in a first mode under a first control signal state; in a second mode under a second control signal state; in a third mode under a third control signal state; if the first mode is that the switch component is turned on, the second mode is that the switch component is turned off; if the first mode is that the switch component is turned off, the second mode is that the switch component is turned on; The third mode switch component obtains the on and off time according to the duty cycle of the PWM square wave signal sent by the controller; The heating component continues to heat when the switch component is in the first mode; remains inoperative when the switch component is in the second mode; and operates according to the third mode. The first threshold is smaller than the second threshold.

9. The air conditioning system according to claim 8, wherein the controller is further configured to: The heating power of the heating component under the first threshold value K1 is obtained to be the first power P1; The heating power of the heating component under the second threshold value K2 is obtained to be the second power P2; According to (K1, P1) and (K2, P2), the curve function f(Ki, Pi) of the ambient temperature signal value Ki and the corresponding heating power Pi is obtained; Obtain the current heating power Pm corresponding to the current ambient temperature signal value Km through the curve function f(Ki,Pi); Substitute the current heating power Pm into formula (1) to calculate the duty cycle Q of the PWM square wave signal; in, V is the voltage applied to the resistor R; n represents that the PWM square wave signal has n cycles, and n is a positive integer; T is the cycle time of the PWM square wave signal; and the resistor R is the equivalent resistance of the heating component.

10. The air conditioning system according to any one of claims 8 to 9, characterized in that: The switch component comprises an insulated gate bipolar transistor (IGBT) device, the base of the IGBT device is electrically connected to the output end of the controller, the collector is electrically connected to the heating component, the emitter is grounded, and a first resistor is electrically connected between the base and the emitter.

11. The air conditioning system according to claim 10, characterized in that: The heating component includes a heating resistor or a heating film.

12. The air conditioning system according to claim 11, characterized in that: The heating component is arranged around the detection probe of the detection sensor.

13. The air conditioning system according to claim 12, characterized in that: The detection sensor is a refrigerant sensor, and the refrigerant sensor is arranged at the air outlet of the air conditioner or the welding joint of the air conditioner side pipe.

14. The air conditioning system according to claim 8, characterized in that: The air conditioning system also includes a humidity sensor for detecting ambient humidity; The dew point temperature is obtained at least by the ambient temperature signal value and the ambient humidity signal value, and the dew point temperature corresponds to a set of fixed first thresholds and second thresholds within a variation range; the variation range of the dew point temperature and the corresponding first thresholds and second thresholds are pre-set in the controller.

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