Method for preventing formation of condensation on a sensor surface for detection and air conditioning system

Abstract

The embodiment of the application provides a method for preventing the formation of condensed water on the surface of a detection sensor and an air conditioning system, and the method comprises the following steps: a temperature sensor detects an ambient temperature; a controller sends a first control signal to a switch assembly to make the switch assembly in a first mode and a heating assembly continuously heats when the ambient temperature signal value is lower than a first threshold K1; the controller sends a second control signal to the switch assembly to make the switch assembly in a second mode and the heating assembly keeps in a non-working state when the ambient temperature signal value is higher than a second threshold K2 and the heating assembly is in a heating state; the controller sends a third control signal to the switch assembly to make the switch assembly in a third mode and the heating assembly works according to the third mode when the ambient temperature signal value is greater than or equal to the first threshold K1 and less than or equal to the second threshold K2; the method reduces the probability of the occurrence of condensed water on the detection sensor in the air conditioning system, ensures the detection accuracy and equipment safety. In addition, different control methods are adopted in different temperature regions, the control accuracy is high, and energy can be saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the refrigeration technical field, and particularly relates to a method for preventing condensate water from forming on the surface of a detection sensor and an air conditioning system. BACKGROUND

[0002] In the air conditioning system, the detection sensor, such as a refrigerant gas sensor, is prone to condensation when the working condition of the air conditioner changes. Specifically, the change of the temperature, pressure and / or humidity in the environment where the air conditioner is located causes the condensate water to exist on some positions of the sensor in the air conditioning system. The condensate water refers to the liquid water formed by the condensation of water vapor in the air when the temperature of the environment drops below the dew point temperature, and the process is called condensation. The condensate water on the sensor easily affects the detection accuracy, and in the case of serious condensate water, it may also drip onto the circuit board and other components in the air conditioning system, causing short circuit or damage. Here, the positions on the sensor mainly refer to positions prone to condensation, such as the detection probe of the sensor, and when the sensor is wrapped with an external metal, the metal part is also prone to condensation. The dew point temperature is the critical temperature at which water vapor in the air changes into condensate water, and when the temperature is greater than or equal to the critical temperature, it is water vapor, and when the temperature is less than the critical temperature, the water vapor condenses into liquid water. SUMMARY

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

[0004] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0005] In a first aspect, the present application provides a method for preventing condensate water from forming on the surface of a detection sensor, which is applied to an air conditioning system. The air conditioning system includes a detection sensor, a temperature sensor, a controller, a switching 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 arranged under the same environmental condition.

[0006] The method includes the following steps:

[0007] The temperature sensor detects the environmental temperature.

[0008] The controller obtains the environmental temperature signal value detected by the temperature sensor.

[0009] When the environmental temperature signal value is lower than a first threshold K1, the controller sends a first control signal to the switching assembly, the switching assembly is in a first mode, and the heating assembly continuously heats.

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

[0011] If the first mode switching assembly remains on, the second mode switching assembly remains off.

[0012] The controller sends a third control signal to the switching assembly when the ambient temperature value Ki is greater than or equal to the first threshold K1 and less than or equal to the second threshold K2, the switching assembly 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, and the third mode is that the heating assembly operates according to the third mode of the switching assembly.

[0013] The third mode is the on and off time of the switching assembly according to the duty cycle of the PWM square wave signal sent by the controller, and the first threshold is less than the second threshold.

[0014] The above technical solution shows that the method for preventing the formation of condensate on the surface of a detection sensor according to the present application includes the following steps: the controller sends a first control signal to the switching assembly when the ambient temperature value is lower than the first threshold K1, the switching assembly is in a first mode, and the heating assembly is continuously heated; the controller sends a second control signal to the second mode heating assembly when the ambient temperature value is higher than the second threshold K2, and the heating assembly is inoperative; and the controller sends a third control signal to the switching assembly when the ambient temperature value Ki is greater than or equal to the first threshold K1 and less than or equal to the second threshold K2, the third control signal is a PWM square wave signal, the duty cycle of the PWM square wave signal is adjusted according to the ambient temperature, the switching assembly is in a third mode, and the heating assembly operates according to the third mode of the switching assembly. This reduces the probability of condensate formation on the detection sensor in the air conditioning system, ensuring detection accuracy and equipment safety. In addition, different control methods are used in different temperature zones, which has high control accuracy and is energy-saving.

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

[0016] The controller is capable of obtaining an ambient temperature signal value detected by the temperature sensor, sending a first control signal to the switch assembly when the ambient temperature value is lower than a first threshold K1, sending a second control signal to the switch assembly when the ambient temperature value is higher than a second threshold K2 and the heating assembly is in a heating state, and sending a third control signal to the switch assembly when the ambient temperature value Ki is greater than or equal to the first threshold K1 and less than or equal to the second threshold K2, the third control signal being a PWM square wave signal, and the duty ratio of the PWM square wave signal being adjusted according to the ambient temperature value.

[0017] The switch assembly is capable of being in a first mode when the first control signal is in a state, being in a second mode when the second control signal is in a state, and being in a third mode when the third control signal is in a state, the second mode being that the switch assembly is turned off if the first mode is that the switch assembly is turned on, and the third mode being that the switch assembly is turned on and turned off according to the duty ratio of the PWM square wave signal sent by the controller.

[0018] The heating assembly continuously heats when the switch assembly is in the first mode, remains in a non-working state when the switch assembly is in the second mode, and works according to the on and off time of the switch assembly obtained according to the duty ratio of the PWM square wave signal sent by the controller when the switch assembly is in the third mode.

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

[0020] The technical scheme can know that the air conditioning system comprises a controller, a switch assembly and a heating assembly, the controller is capable of sending a first control signal to the switch assembly when an ambient temperature is lower than a first threshold K1, the switch assembly being in a first mode and the heating assembly being heated, sending a second control signal to the switch assembly when the ambient temperature is higher than a second threshold K2, the switch assembly being in a second mode and the heating assembly not being heated, and sending a third control signal to the switch assembly when the ambient temperature Ki is greater than or equal to the first threshold K1 and less than or equal to the second threshold K2, the third control signal being a PWM square wave signal, and the duty ratio of the PWM square wave signal being adjusted according to the ambient temperature, the switch assembly being in a third mode, being turned on and turned off according to the duty ratio Q of the PWM square wave signal, and the heating assembly being heated and not being heated according to the third mode of the switch assembly. The probability of condensate water appearing in a sensor for detecting in the air conditioning system is reduced, and the detection accuracy and equipment safety are ensured. In addition, different control methods are adopted in different temperature regions, the control accuracy is high, and energy is saved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A hardware framework schematic diagram of an air conditioning system is provided for the embodiment of the application.

[0022] Figure 2A method flow chart for preventing condensate water from forming on the surface of a sensor for detection is provided in the embodiments of the present application.

[0023] Figure 3 A duty cycle Q acquisition method flow chart is provided in the embodiments of the present application.

[0024] Figure 4 A circuit schematic diagram of one embodiment of the heating assembly provided in the present application is provided.

[0025] Figure 5 A distribution diagram of the heating assembly provided in the embodiments of the present application is provided.

[0026] Figure 6 A diagram showing the relationship between the heat generation power of the heating assembly of different package sizes provided in the embodiments of the present application and the ambient temperature is provided.

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

[0028] It should be noted that the embodiments described in the present application are only a part of the embodiments of the present application, not all the embodiments.

[0029] In view of the problems in the background art, the embodiments of the present application provide a method for preventing condensate water from forming on the surface of a sensor for detection, which is applied in an air conditioning system, and will be described below in conjunction with the accompanying drawings. The accompanying drawings are provided to help understand the present application. Figure 1 An air conditioning system is provided in the embodiments of the present application, which comprises at least a sensor for detection, a temperature sensor 101, a controller 102, a switch assembly 103, a heating assembly 1044, and a sensor for detection (not shown). The heating assembly is arranged on the sensor for detection in the air conditioning system, and the sensor for detection and the temperature sensor are located in the same environmental condition. Here, the heating assembly 104 is arranged on the sensor for detection. For example, on the detection probe of the sensor, or on the metal part of the sensor wrapped with metal, which are prone to condensation. For example, the sensor here can be a temperature sensor, a refrigerant sensor, and a humidity sensor, etc. Figure 1 In the embodiments of the present application, the heating assembly 104 can 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 embodiments of the present application.

[0030] The accompanying drawings are provided to help understand the present application.

[0031] A method for preventing condensate water from forming on the surface of a sensor for detection is provided in the embodiments of the present application, which is applied in the above-mentioned air conditioning system. The method comprises: Figure 2

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

[0033] 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: The controller pre-sets a first threshold K1 and a second threshold K2.

[0036] Optionally, the controller also pre-sets two threshold values, a first power P1 and a second power P2 of the heating assembly;

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

[0038] Of course, another test method can also be used, in which the first power P1 is the power value when the heating assembly is on for a time t1, and the second power P2 is the power value when the heating assembly is on for a time t2, where t1>t2. For example, the first power P1 can be calculated by measuring the current I and voltage V of the heating assembly in the opening 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 assembly in the opening time t2 using the formula P2=V×I.

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

[0040] This step 105 is limited by the writing, and it is not necessarily after step S103 in practice, and can be performed before step S101 or step S103, which is not limited by the writing order here.

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

[0042] S1091: The switching assembly is in the first mode under the first control signal state;

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

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

[0045] S1092: The switching assembly is in the second mode under the second control signal state;

[0046] S1112: Heating component is not working;

[0047] S1073: The controller sends a third control signal to the switching component at least when the ambient temperature signal value Ki is greater than or equal to the first threshold K1 and less than or equal to the second threshold 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 ambient temperature signal value, where PWM is a pulse width modulation signal. This technical solution reduces the probability of condensation on the sensors used for detection in the air conditioning system, ensuring detection accuracy and equipment safety. Furthermore, different control methods are used for different temperature zones. Specifically, in the first temperature zone, the heating element is controlled to continuously heat; in the second temperature zone, the PWM duty cycle is adjusted according to the detected temperature to control the heating time of the heating element; and in the third temperature zone, the heating element is controlled to not heat. Therefore, the control accuracy is high, and energy saving is achieved.

[0049] Because dew point temperature is related to environmental factors such as air pressure, temperature, and humidity, changes in these factors will also affect the dew point temperature. Here, the dew point temperature within a certain range corresponds to a fixed set of first and second thresholds. Each set of first and second thresholds can be obtained by researchers through testing under operating conditions or through theoretical calculations. For example, if the dew point temperature is between T1 and T2, then the corresponding first threshold K11 and second threshold K21 are set; if the dew point temperature is between T3 and T4, then the corresponding first threshold K12 and second threshold K22 are set. The first and second thresholds need to be set before the equipment leaves the factory. In this application's technical solution, the current dew point temperature can be calculated from temperature, humidity, and / or air pressure. The controller selects the first and second thresholds corresponding to the current dew point temperature and then executes the aforementioned anti-condensation method.

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

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

[0052] The curve function herein can be a linear function or a quadratic function. The conventional function calculation is not described herein again.

[0053] S203: Obtain the current heating power Pm corresponding to the current environmental temperature value Km by 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] 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 assembly, so the duty cycle Q = .

[0057] Further, if the number of the current heating assemblies is multiple, which are R1, R2, … Ri, …, i is an integer greater than or equal to 2, and the n heating assemblies are in parallel, at this time, substitute the current heating power Pm into the following formula to obtain the duty cycle Q of the PWM square wave signal.

[0058]

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

[0060] Wherein, step 201 is limited by the writing order, which can actually be in step 1073, or in any step of steps 101-105, and is not limited by the writing order. Step 203 can be interval order or direct order as long as it is after step 201, and is not limited.

[0061] S1093: The switch assembly is in the third mode under the third control signal state.

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

[0063] Wherein, the first threshold value is less than the second threshold value.

[0064] For example, the duty cycle Q is 50%, then in a PWM square wave signal period T, T / 2 period switch component is on, and T / 2 period switch component is off. The steps S1071-S1093 are not executed in sequence due to the limitation of the writing. Specifically, in the controller, the steps S1071, S1072 and S1073 are parallel steps, and the controller will only execute one of them after receiving the detected ambient temperature signal value. Similarly, the steps S1091, S1092 and S1093 are also parallel steps, which are actually sequentially selected after the controller judges and selects one of the steps S1071, S1072 and S1073. For example, if the controller judges that the current is in step S1071, and the current detected ambient temperature is in the first temperature region, then step S1091 is executed.

[0065] In the above 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 static damage. The base of the IGBT device is turned on in the high level state, and is turned off in the low level state. As shown in Figure 4 In one embodiment, if the collector of the IGBT is connected in series with the heating component, the heating component can work to heat when the IGBT device is turned on, and does not work when the IGBT device is turned off. In another embodiment, as shown in Figure 7 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. As shown in the accompanying Figure 4 As shown in the accompanying

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

[0067] As shown in the accompanying Figure 4 As shown in the accompanying, five heating resistors R116, R117, R118, R119 and R120 are connected in parallel as an example. 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] Wherein: the heating power of each heating resistor is as described in the formula table:

[0069]

[0070] Therefore, the maximum heating power of the heating assembly provided in the embodiments of the present application is expressed in the following formula:

[0071]

[0072] That is, the heating assembly 104 adopts the assembly formed by the parallel connection of n heating resistors, where n≥2, and the heating power of the heating assembly can be controlled to change in the range of 0~PMAX.

[0073] It can be understood that the five heating resistors in the embodiments of the present application are only illustrative, and in actual use, the number of heating resistors can also be two, three, four, and can also be six or more, according to actual needs. The embodiments of the present application are not specifically limited. Specific reference should be made to the resistance value and cost of the heating resistors available on the market.

[0074] The heating assembly is arranged around the detection probe of the sensor to heat the sensor uniformly and improve the heating efficiency. For example, referring to FIG. 1, Figure 5 The five heating resistors are distributed on the PCB 1 and located around the sensor probe 2, so that when the heating resistors work, the temperature of the sensor itself can be uniform, and the problem of easy condensation can be avoided.

[0075] The packaging sizes of the heating resistors selected in the embodiments of the present application can be the same, for example, all 0805, or can be different. The embodiments of the present application are not specifically limited.

[0076] Because the heating resistors of different packaging sizes, even if the same heating power is generated, the effect of improving the ambient temperature of the sensor will be different. In order to enable the heating assembly to significantly improve the ambient temperature of the sensor, the heating resistors should select appropriate packaging sizes. Therefore, the embodiments of the present application can select the packaging size of the heating assembly based on the relationship between the heating power generated by the heating assembly of different packaging sizes and the improvement of the ambient temperature. For example, referring to FIG. 2, Figure 6 FIG. 2 is a schematic diagram of the relationship between the heating power generated by a heating assembly of different packaging sizes provided in the embodiments of the present application and the ambient temperature. Figure 4 In actual use, the heating power can also have a curved relationship with the improvement of the ambient temperature, because the working principle is the same, which will not be described here.

[0077] For example, referring to FIG. 3, Figure 6As shown, straight line (1) represents a heating resistor with a package size of 0402 and a thermal resistance of 800 K / W (i.e. 800 Kelvin per Watt). Straight line (2) represents a heating resistor with a package size of 0603 and a thermal resistance of 400 K / W. Straight line (3) represents a heating resistor with a package size of 0805 and a thermal resistance of 250 K / W. Straight line (4) represents a heating resistor with a package size of 1206 and a thermal resistance of 200 K / W. Straight line (5) represents a heating resistor with a package size of 1210 and a thermal resistance of 125 K / W. Straight line (6) represents a heating resistor with a package size of 1218 and a thermal resistance of 100 K / W. Straight line (7) represents a heating resistor with a size of 2010 and a thermal resistance of 80 K / W. Straight line (8) represents a heating resistor with a size of 2512 and a thermal resistance of 100 K / W. According to the above table, a heating resistor with a suitable package size can be selected, and the heating resistor can generate a heat power that can make the ambient temperature rise above the dew point temperature to achieve the anti-condensation effect. Here, aK / W represents that when 1 Watt of heat passes through the heating resistor, a Kelvin temperature difference will be generated at both ends of the heating resistor. Figure 6 As shown, a heating resistor with a suitable package size can be selected, and the heating resistor can generate a heat power that can make the ambient temperature rise above the dew point temperature to achieve the anti-condensation effect. Here, aK / W represents that when 1 Watt of heat passes through the heating resistor, a Kelvin temperature difference will be generated at both ends of the heating resistor.

[0078] It should be noted that each heating resistor in the circuit in the embodiments of the present application can be an independent single resistor, or a plurality of sub-resistors connected in series / parallel / hybrid, or the like, and the embodiments of the present application are not specifically limited.

[0079] If the detection sensor is a refrigerant sensor, the refrigerant sensor is arranged at the air outlet of the air conditioner, preferably at the air outlet, a position most likely to leak refrigerant, or at a position with many pipe joints, such as a pipe elbow.

[0080] In the technical solution of the present application, the heating assembly is arranged on the detection sensor in the air conditioning system, and the detection sensor and the temperature sensor are in the same environmental condition. The probability of condensate water on the detection sensor in the air conditioning system is reduced, and the detection accuracy and equipment safety are ensured. In addition, according to the obtained environmental temperature, the temperature region is controlled, the control accuracy is high, and energy is saved.

[0081] The embodiments of the present application also provide an air conditioning system, which at least comprises a detection sensor, a temperature sensor, a controller, a switching 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 in the same environmental condition.

[0082] The temperature sensor can be used at least to detect the environmental temperature;

[0083] The controller is capable of obtaining an ambient temperature signal value detected by the temperature sensor; sending a first control signal to the switch assembly when the ambient temperature signal value is lower than a first threshold K1; sending a second control signal to the switch assembly when the ambient temperature signal value is higher than a second threshold K2 and the heating assembly is in a heating state; and sending a third control signal to the switch assembly when the ambient temperature signal value Ki is greater than or equal to the first threshold K1 and less than or equal to the second threshold K2, the third control signal being a PWM square wave signal, and the duty cycle of the PWM square wave signal being adjusted according to the ambient temperature signal value.

[0084] The switch assembly is capable of being in a first mode when the first control signal is sent, being in a second mode when the second control signal is sent, and being in a third mode when the third control signal is sent; if the first mode is that the switch assembly is turned on, the second mode is that the switch assembly is turned off; and the third mode is that the switch assembly is turned on and turned off according to the duty cycle of the PWM square wave signal sent by the controller.

[0085] The heating assembly continuously heats when the switch assembly is in the first mode, remains inactive when the switch assembly is in the second mode, and works according to the third mode when the switch assembly is in the third mode.

[0086] The first threshold is less than the second threshold.

[0087] In an optimized implementation of the controller, the controller is further capable of:

[0088] obtaining a first power P1 of the heating assembly when the first threshold K1 is reached;

[0089] obtaining a second power P2 of the heating assembly when the second threshold K2 is reached;

[0090] obtaining a curve function f(Ki, Pi) of the ambient temperature signal value Ki and the corresponding heating power Pi according to (K1, P1) and (K2, P2);

[0091] obtaining a current heating power Pm corresponding to a current ambient temperature signal value Km through the curve function f(Ki, Pi);

[0092] substituting the current heating power Pm into the following formula to obtain a duty cycle Q of the PWM square wave signal;

[0093]

[0094] wherein V is a voltage applied to the resistor R; n represents that the PWM square wave signal has n cycles, n being a positive integer; and T is a cycle time of the PWM square wave signal.

[0095] In a preferred embodiment, the number of heating components is greater than or equal to two, and the heating components are arranged in parallel.

[0096] The current heating power Pm is substituted into the following equation to obtain the duty cycle Q of the PWM square wave signal:

[0097]

[0098] where V is the voltage applied across the parallel circuit, n represents the number of cycles of the PWM square wave signal, n is a positive integer, T is the cycle time of the PWM square wave signal, and Ri is the equivalent resistance of each parallel branch of the heating component.

[0099] In the embodiment of the application, the switching component includes at least an insulated gate bipolar transistor (IGBT) device, the base of the IGBT device is electrically connected to the output terminal 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.

[0100] In the embodiment of the application, the heating component includes at least a heating resistor or a heating film.

[0101] In the embodiment of the application, the number of heating components is greater than or equal to two, and the heating components are arranged in parallel.

[0102] In the embodiment of the application, the heating component is arranged around the detection probe of the sensor.

[0103] The detection sensor is a refrigerant sensor, which is arranged at the air outlet of the air conditioner or the position of the air conditioner side pipe welding joint.

[0104] Since the air conditioning system in the embodiment is the air conditioning system to which the above-mentioned method for preventing condensate water from forming on the surface of the detection sensor is applied, the relevant content in the air conditioning system has been described in detail in the corresponding method part, and will not be repeated here.

[0105] In the air conditioning system of the application, the heating component is arranged on the detection sensor, and the heating time of the heating component is obtained through the on-off control of the switching component, thereby reducing the probability of condensate water on the detection sensor in the air conditioning system, ensuring the detection accuracy and equipment safety. In addition, the controller can control the heating component according to the obtained environmental temperature, and the control precision is high and energy-saving.

[0106] The controller mentioned in all technical solutions of the application can be all the master control chips in the air conditioning system, or a small control chip added independently.

[0107] The system architecture and business scenarios described in the embodiments of the present application are used to more clearly illustrate the technical solutions of the present application, and do not constitute a limitation on the technical solutions of the present application. Those skilled in the art can know that, with the evolution of network architecture and the appearance of new business scenarios, the technical solutions of the present application are also applicable to similar technical problems.

[0108] The above application of specific examples describes the principles and implementation methods of the present application. The above embodiment is only used to help understand the method and its core idea of the present application. It should be pointed out that, for those skilled in the art, without departing from the principles of the present application, the present application can be improved and modified. These improvements and modifications also fall within the scope of the present application.

Claims

1. A method for preventing condensation on the surface of a detection sensor, applied in an air conditioning system, characterized in that, The air conditioning system includes a detection sensor, a temperature sensor, a controller, a switching assembly, and a heating assembly; the heating assembly is disposed on the detection sensor within the air conditioning system, and the detection sensor and the temperature sensor are disposed under the same environmental conditions. The method includes: The temperature sensor detects the ambient temperature. The controller obtains the ambient temperature signal value detected by the temperature sensor; When the ambient temperature signal value is lower than the first threshold K1, the controller sends a first control signal to the switching component, the switching component is in a first mode, and the heating component continues to heat. When the ambient temperature signal value is higher than the second threshold K2 and the heating component is in the heating state, the controller sends a second control signal to the switching component, the switching component is in the second mode, and the heating component remains inactive. Wherein, if the first mode is that the switch component remains on, then the second mode is that the switch component remains off; When the ambient temperature signal value Ki is greater than or equal to the first threshold K1 and less than or equal to the second threshold K2, the controller sends a third control signal to the switching component to put the switching component into 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. The heating component operates according to the third mode of the switching component. The third mode refers to the on and off times of the switching component based on 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 condensation 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 K1 state is obtained as the first power P1; The heating power of the heating component under the second threshold K2 state is obtained as the second power P2; Based on (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 heat generation power Pm into formula (1) to calculate the duty cycle Q of the PWM square wave signal; （1） Where V is the voltage applied to resistor R; n indicates that the PWM square wave signal has n cycles, where n is a positive integer; T is the period of the PWM square wave signal; and the resistor R is the equivalent resistance of the heating component.

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

4. The method for preventing condensation on the surface of a detection sensor according to claim 3, characterized in that, The duty cycle Q of the PWM square wave signal is obtained by substituting the current heating power Pm into formula (2); （2） Where V is the voltage applied across the parallel circuit; n indicates that the PWM square wave signal has n cycles, where n is a positive integer; T is the period of the PWM square wave signal; and Ri is the equivalent resistance of each parallel branch of the heating component.

5. The method for preventing condensation on the surface of a detection sensor according to any one of claims 1-4, characterized in that, The switching assembly includes an insulated gate bipolar transistor (IGBT) device. The base of the IGBT device is electrically connected to the output terminal of the controller, the collector is electrically connected to the heating assembly, the emitter is grounded, and a first resistor is electrically connected between the base and the emitter.

6. The method for preventing condensation on the surface of a detection sensor according to claim 5, characterized in that, The sensor used for detection is a refrigerant sensor, which is installed at the air conditioner outlet or at a location with many welding joints on the air conditioner bypass pipe.

7. The method for preventing condensation 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 from the ambient temperature signal value and the ambient humidity signal value. The dew point temperature corresponds to a set of fixed first threshold and second threshold within a range of variation. The range of variation of the dew point temperature and the corresponding first threshold and second threshold are preset in the controller.

8. An air conditioning system, characterized in that, It includes a detection sensor, a temperature sensor, a controller, a switching assembly, and a heating assembly; the heating assembly is disposed on the detection sensor within the air conditioning system, and the detection sensor and the temperature sensor are disposed under the same environmental conditions; The temperature sensor is at least capable of detecting ambient temperature; The controller is at least capable of obtaining the ambient temperature signal value detected by the temperature sensor; when the ambient temperature signal value is lower than a first threshold K1, it sends a first control signal to the switching component; when the ambient temperature signal value Ki is higher than a second threshold K2 and the heating component is in heating mode, it sends a second control signal to the switching component; when the ambient temperature signal value Ki is greater than or equal to the first threshold K1 and less than or equal to the second threshold K2, it sends a third control signal to the switching component, wherein 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 switching component can be used to be in a first mode under a first control signal state; in a second mode under a second control signal state; and in a third mode under a third control signal state; if the first mode is when the switching component is turned on, then the second mode is when the switching component is turned off. The third mode is that the switching components obtain the on and off times based on the duty cycle of the PWM square wave signal sent by the controller; The heating component continuously heats when the switching component is in the first mode; remains inactive when the switching component is in the second mode; and operates according to the on and off times obtained from the duty cycle of the PWM square wave signal sent by the controller when the switching component is in the third mode. Wherein, the first threshold is less than the second threshold.

9. The air conditioning system according to claim 8, wherein the controller is further capable of at least: The heating power of the heating component under the first threshold K1 state is obtained as the first power P1; The heating power of the heating component under the second threshold K2 state is obtained as the second power P2; Based on (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; （1） in, V is the voltage applied to resistor R; n indicates that the PWM square wave signal has n cycles, where n is a positive integer; T is the period 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 8-9, characterized in that, The switching assembly includes an insulated gate bipolar transistor (IGBT) device. The base of the IGBT device is electrically connected to the output terminal of the controller, the collector is electrically connected to the heating assembly, 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 assembly is arranged around the detection probe of the detection sensor.

13. The air conditioning system according to claim 12, characterized in that, The sensor used for detection is a refrigerant sensor, which is installed at the air conditioner outlet or the welding head of the air conditioner bypass 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 from the ambient temperature signal value and the ambient humidity signal value. The dew point temperature corresponds to a set of fixed first threshold and second threshold within a range of variation. The range of variation of the dew point temperature and the corresponding first threshold and second threshold are preset in the controller.

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