Compensation method for detection signal of refrigerant sensor and refrigerating system

Abstract

The invention provides a refrigerant sensor detection signal compensation method and a refrigeration system.The refrigerant leakage detection method comprises the steps that a refrigerant leakage detection unit detects the current refrigerant leakage environment, and an initial signal is obtained; the temperature and humidity compensation unit detects the temperature and humidity change of the current refrigerant leakage environment to obtain a first compensation signal; the first temperature change detection unit detects a temperature change signal of an environment where the current refrigerant leakage detection probe unit is located to obtain a first signal; a second temperature change detection unit detects a temperature change signal of the environment where the current reference probe unit is located to obtain a second signal; obtaining a second compensation signal through the first signal and the second signal; and compensating the initial signal by the first compensation signal and the second compensation signal to obtain a detection reference value in the current environment. According to the technical scheme, the influence of concentration misinformation caused by temperature imbalance at the two ends of the probe is reduced.

Description

Technical Field

[0001] The present application relates to the field of refrigeration technology, and in particular to a compensation method for a refrigerant sensor detection signal and a refrigeration system. Background Art

[0002] For example, when flammable and explosive gases such as R32 refrigerant and R290 refrigerant are used as refrigerants, there is a great safety risk if leakage occurs. As far as the inventors know, this type of refrigerant leakage detection can be carried out through the principle of thermal conductivity. Specifically, detection is carried out through the changes in the reference probe in the refrigerant sensor probe and the thermistor in the detection probe. However, since the thermal dissipation coefficients of the reference end and the detection end of the probe are different, the temperatures are also inconsistent, resulting in inconsistent temperature changes of the thermistors at the reference end and the detection end of the probe when the temperature changes rapidly. The temperature difference change between the reference end and the detection end of the probe is positively correlated with the refrigerant concentration in the environment, so false alarms and misreporting of safety alarms will occur, causing safety problems. Summary of the invention

[0003] In view of this, the present application provides a compensation method for a refrigerant sensor detection signal and a refrigeration system, which reduce the impact of false concentration alarms caused by temperature imbalance at both ends of the probe and reduce safety issues caused by false alarms of refrigerant leakage.

[0004] In a first aspect, the present application provides a compensation method for a refrigerant sensor detection signal, which is applied to a refrigeration system, wherein the refrigeration system includes a refrigerant sensor and a control unit, wherein the refrigerant sensor includes a refrigerant leakage detection unit, a first temperature change detection unit, a second temperature change detection unit, and a temperature and humidity compensation unit; the refrigerant leakage detection unit includes a refrigerant detection probe unit and a reference probe unit;

[0005] The refrigerant leakage detection method includes: a refrigerant leakage detection unit detects the current refrigerant leakage environment to obtain an initial signal; a temperature and humidity compensation unit detects the temperature and humidity changes in the current refrigerant leakage environment to obtain a first compensation signal; a first temperature change detection unit detects the temperature change signal in the environment where the current refrigerant leakage detection probe unit is located to obtain a first signal; a second temperature change detection unit detects the temperature change signal in the environment where the current reference probe unit is located to obtain a second signal;

[0006] Obtain a second compensation signal through the first signal and the second signal;

[0007] The first compensation signal and the second compensation signal compensate the initial signal to obtain a detection reference value under the current environment.

[0008] It can be seen from the above scheme that the present application provides a compensation method for the detection signal of the refrigerant sensor, wherein the temperature change signal in the environment where the current refrigerant leakage detection probe unit is located is detected by the first temperature change detection unit as the first signal, and the temperature change signal in the environment where the current reference probe unit is located is detected by the second temperature change detection unit as the second signal, and the difference between the first signal and the second signal is used as the second compensation signal, and the control unit combines the second compensation signal and the first compensation signal to jointly compensate the initial signal in the current refrigerant leakage environment to obtain the detection reference value in the current environment. Thereby reducing the influence of false alarms of concentration caused by the temperature imbalance at both ends of the probe.

[0009] A second aspect of the present application provides a refrigeration system, the refrigeration system comprising a refrigerant sensor and a control unit, the refrigerant sensor comprising a refrigerant leakage detection unit, a first temperature change detection unit, a second temperature change detection unit and a temperature and humidity compensation unit; the refrigerant leakage detection unit comprising a refrigerant leakage detection probe unit and a reference probe unit;

[0010] The refrigerant leakage detection unit can be used to obtain an initial signal under the current refrigerant leakage environment;

[0011] The temperature and humidity compensation unit can be used to obtain a first compensation signal under the current refrigerant leakage environment; wherein the first compensation signal is a temperature and humidity change signal under the current refrigerant leakage environment;

[0012] The position where the first temperature change detection unit is set can be used to detect the temperature change signal of the environment where the refrigerant leakage detection probe unit is currently located, and use it as the first signal;

[0013] The position where the second temperature change detection unit is arranged can be used to detect a temperature change signal in the environment where the reference probe unit is located, and use it as a second signal;

[0014] The control unit can be used to obtain a second compensation signal under the current refrigerant leakage environment, wherein the second compensation signal under the current refrigerant leakage environment is the difference between the first signal and the second signal;

[0015] The control unit can also compensate the initial signal under the current refrigerant leakage environment by using the first compensation signal and the second compensation signal to obtain a reference signal value under the current environment.

[0016] It can be seen from the above scheme that the present application provides a refrigeration system, which obtains a first signal by setting a first temperature change detection unit at a position capable of detecting the temperature change signal of the environment in which the current refrigerant leakage detection probe unit is located, and obtains a second signal by setting a second temperature change detection unit at a position capable of detecting the temperature change signal of the environment in which the current reference probe unit is located, and uses the difference between the first signal and the second signal as a second compensation signal. After obtaining the second compensation signal in the current refrigerant leakage environment, the control unit combines the second compensation signal and the first compensation signal to jointly compensate for the initial signal in the current refrigerant leakage environment to obtain the detection reference value in the current environment, thereby reducing the impact of false concentration alarms caused by temperature imbalance at both ends of the probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0018] Figure 1 A hardware schematic diagram of a refrigeration system provided in an embodiment of the present application;

[0019] Figure 2 A schematic diagram of a flow chart of an embodiment of the method of the present application;

[0020] Figure 3 A hardware block diagram of a refrigerant leakage detection unit for this application;

[0021] Figure 4 A schematic diagram of a refrigerant leakage detection unit for the present application;

[0022] Figure 5 A schematic diagram of a first temperature change detection unit of the present application;

[0023] Figure 6 A schematic diagram of a second temperature change detection unit of the present application;

[0024] Figure 7 A circuit block diagram of a first temperature change detection unit of the present application;

[0025] Figure 8 A schematic diagram of a second temperature change detection unit of the present application;

[0026] Fig. 9 This is a flow chart of a method for obtaining a detection reference value in the current environment in the present application. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to describe the technical solution of the present application more clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the technical solution in the present application, all other technical solutions obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] The present application embodiment provides a refrigeration system, such as Figure 1 As shown, it includes: a refrigerant sensor and a control unit; the refrigerant sensor includes: a refrigerant leakage detection unit 100, a first temperature change detection unit 200, a second temperature change detection unit 300 and a temperature and humidity compensation unit 400; the refrigerant leakage detection unit 100, the first temperature change detection unit 200, the second temperature change detection unit 300 and the temperature and humidity compensation unit 400 are all electrically connected to the control unit 500; the refrigerant sensor and the control unit are applied to the refrigeration system.

[0029] The refrigerant leakage detection unit 100 includes a refrigerant leakage detection probe unit 110 and a reference probe unit 120 .

[0030] It should be noted that the position where the first temperature change detection unit is set can be used to detect the temperature change signal in the environment where the current refrigerant leakage detection probe unit is located, and use it as the first signal; the position where the second temperature change detection unit is set can be used to detect the temperature change signal in the environment where the reference probe unit is located, and use it as the second signal.

[0031] Understandably, Figure 1 It is a schematic diagram of the internal hardware of a refrigerant sensor. The size and position of the hole of the refrigerant leakage detection probe unit 110 can be changed according to the actual application. The first temperature change detection unit 200 can be on any side of the refrigerant leakage detection probe unit 110, very close to the refrigerant leakage detection probe unit, and in the same environment as the refrigerant leakage detection probe unit. The second temperature change detection unit 300 can be on any side of the reference probe unit 120, close to the reference probe unit, and in the same environment as the reference probe unit. No limitation is made here.

[0032] In the specific implementation process of the present application, the temperature and humidity compensation unit 300 may be but is not limited to a temperature and humidity sensor, and the control unit 500 may directly obtain the first compensation signal through the temperature and humidity sensor, which is not limited here.

[0033] In the specific implementation process of the present application, the control unit 500 may be, but is not limited to, a microcontroller unit (MCU), which is not limited here.

[0034] In one embodiment of the present application, a compensation method for a refrigerant sensor detection signal is provided, which is applied to the above refrigeration system, such as Figure 2 As shown, the specific steps include:

[0035] S201. A refrigerant leakage detection unit detects a current refrigerant leakage environment and obtains an initial signal.

[0036] Optionally, in another embodiment of the present application, an implementation of the refrigerant leakage detection unit 100 is as follows: Figure 3 As shown, it includes a refrigerant leakage detection probe unit 110, a reference probe unit 120 and a control unit 500. The specific implementation method of step S201 includes: differentiating the signals respectively detected by the refrigerant leakage detection probe unit and the reference probe unit to obtain the differential signal under the current refrigerant leakage environment as the initial signal under the current refrigerant leakage environment.

[0037] In order to make the differential signal within the range that the control unit 500 can process, an operational amplifier unit 600 is used. As an embodiment, the operational amplifier unit 600 can be electrically connected to the refrigerant leakage detection probe unit 110, the reference probe unit 120 and the control unit 500 respectively.

[0038] In the actual application process of the present application, the operational amplifier unit 600 can not only be integrated into the refrigerant leakage detection unit 100, but also can be directly integrated into the refrigerant sensor, which is not limited here.

[0039] Optionally, in another embodiment of the present application, the refrigerant leakage detection probe unit 110 and the reference probe unit 120. The refrigerant leakage detection probe unit 110 includes a detection probe negative temperature coefficient thermistor (Negative Temperature Coefficient thermistor, NTC) 111, and the reference probe unit 120 includes a zero concentration refrigerant probe negative temperature coefficient thermistor 121. The refrigerant leakage detection unit 100 also includes a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6, as shown in FIG. Figure 4As shown, one end of the third resistor R3 is connected to the power supply VCC, and the other end is respectively connected to the fourth resistor R4 and the detection probe negative temperature coefficient thermistor 111. One end of the sixth resistor R6 is grounded, and the other end is respectively connected to the fifth resistor R5 and the zero-concentration refrigerant probe negative temperature coefficient thermistor 121. The detection probe negative temperature coefficient thermistor 111 is connected to the zero-concentration refrigerant probe negative temperature coefficient thermistor 121, and one end of the operational amplifier unit 600 is connected between the detection probe negative temperature coefficient thermistor 111 and the zero-concentration refrigerant probe negative temperature coefficient thermistor 121, and the other end of the operational amplifier unit 600 is connected to the control unit 500. The fifth resistor R5 is connected to the sixth resistor R6, and one end of the operational amplifier unit 600 is connected between the fifth resistor R5 and the sixth resistor R6, and the other end of the operational amplifier unit 600 is connected to the control unit 500.

[0040] In the actual application process of the present application, when the refrigerant passes through the probe, the refrigerant will pass through the detection probe with holes (i.e., the refrigerant leakage detection probe unit), so that the resistance value of NTC1 in the refrigerant leakage detection probe unit becomes larger, so the voltage divider V2 will increase, thereby increasing the value of the differential signal (V2-V1) in the current refrigerant leakage environment. At this time, the differential signal (V2-V1) is amplified by the amplifier in the operational amplifier unit 600, and the bias voltage in the operational amplifier unit 600 is added to obtain the initial signal in the current refrigerant leakage environment. That is, the initial signal in the current refrigerant leakage environment = (V2-V1) × amplification factor + bias voltage.

[0041] In actual application, since the detection probe negative temperature coefficient thermistor 111 and the zero-concentration refrigerant probe negative temperature coefficient thermistor 121 are two thermistors, the temperature balance between the two thermistors has a decisive influence on whether the zero point of the sensor is accurate.

[0042] However, when the temperature changes rapidly, since the reference probe unit 120 is sealed and the refrigerant leakage detection unit 110 has an opening, the temperatures at both ends of the probe (i.e., the changes in the detection probe negative temperature coefficient thermistor 111 and the zero-concentration refrigerant probe negative temperature coefficient thermistor 121) are inconsistent, which easily generates a voltage difference under different concentrations, thereby causing false concentration alarms. Therefore, a second compensation signal is needed to eliminate this error, so that the detection value is more accurate.

[0043] S202: The temperature and humidity compensation unit detects the temperature and humidity changes in the current refrigerant leakage environment to obtain a first compensation signal.

[0044] S203, the first temperature change detection unit obtains the first signal and the second temperature change detection unit obtains the second signal, and obtains the second compensation signal under the current refrigerant leakage environment through the first signal and the second signal. Specifically, the second compensation signal can be a difference signal between the first signal and the second signal, or a multiple of the difference signal, or the first signal multiplied by the first multiple, the second signal multiplied by the second multiple and then taking the difference, etc.

[0045] Among them, the second compensation signal ΔV under the current refrigerant leakage environment NTC The first signal V NTC1 and the second signal V NTC2 the first signal is a temperature change signal detected by the first temperature change detection unit in the environment where the refrigerant leakage detection probe unit is located; the second signal is a temperature change signal detected by the second temperature change detection unit in the environment where the reference probe unit is located.

[0046] Optionally, in another embodiment of the present application, an implementation of the first temperature change detection unit 200 is as follows: Figure 5 As shown, including:

[0047] A first negative temperature coefficient thermistor NTC1 , a first resistor 210 , and a first capacitor 220 .

[0048] The first negative temperature coefficient thermistor NTC1 is connected to the power supply VCC and one end of the first resistor 210 respectively; the other end of the first resistor 210 is connected to the ground GND. One end of the first capacitor 220 is connected between the first negative temperature coefficient thermistor NTC1 and the first resistor 210, and the other end is connected between the first resistor 210 and the ground GND. The control unit 500 is connected to the common end of the first capacitor 220, the first negative temperature coefficient thermistor NTC1, and the first resistor 210.

[0049] Specifically, the control unit 500 obtains a signal from a common end of the first capacitor 220 , the first negative temperature coefficient thermistor NTC1 , and the first resistor 210 as the first signal.

[0050] Optionally, in another embodiment of the present application, an implementation of the second temperature change detection unit 300 is as follows: Figure 6 As shown, including:

[0051] a second negative temperature coefficient thermistor NTC2 , a second resistor 310 , and a second capacitor 320 .

[0052] The second negative temperature coefficient thermistor NTC2 is connected to the power supply VCC and one end of the second resistor 310 respectively; the other end of the second resistor 310 is connected to the ground GND. One end of the second capacitor 320 is connected between the second negative temperature coefficient thermistor NTC2 and the second resistor 310, and the other end is connected between the second resistor 310 and the ground GND. The control unit 500 is connected to the common end of the second capacitor 320, the second negative temperature coefficient thermistor NTC2, and the second resistor 310.

[0053] Specifically, the control unit 500 obtains a signal from a common end of the second capacitor 230 , the second negative temperature coefficient thermistor NTC1 , and the second resistor 220 as the second signal.

[0054] Optionally, in another embodiment of the present application, an implementation of the first temperature change detection unit 200 is as follows: Figure 7 As shown, including:

[0055] A first negative temperature coefficient thermistor NTC1 , a first resistor 210 , a first capacitor 220 and a third capacitor 230 .

[0056] The first negative temperature coefficient thermistor NTC1 is connected to the power supply VCC and one end of the first resistor 210 respectively; the other end of the first resistor 210 is connected to the ground GND. One end of the first capacitor 220 is connected between the first negative temperature coefficient thermistor NTC1 and the first resistor 210, and the other end is connected between the first resistor 210 and the ground GND. The control unit 500 is connected to the common end of the first capacitor 220, the first negative temperature coefficient thermistor NTC1, and the first resistor 210. One end of the third capacitor 230 is connected to the ground GND, and the other end is connected between the power supply VCC and the first negative temperature coefficient thermistor NTC1.

[0057] Specifically, the control unit 500 obtains a signal from a common end of the first capacitor 220 , the first negative temperature coefficient thermistor NTC1 , and the first resistor 210 as the first signal.

[0058] Optionally, in another embodiment of the present application, an implementation of the second temperature change detection unit 300 is as follows: Figure 8 As shown, including:

[0059] a second negative temperature coefficient thermistor NTC2 , a second resistor 310 , a second capacitor 320 and a fourth capacitor 330 .

[0060] The second negative temperature coefficient thermistor NTC2 is connected to the power supply VCC and one end of the second resistor 310 respectively; the other end of the second resistor 310 is connected to the ground GND. One end of the second capacitor 320 is connected between the second negative temperature coefficient thermistor NTC2 and the second resistor 310, and the other end is connected between the second resistor 310 and the ground GND. The control unit 500 is connected to the common end of the second capacitor 320, the second negative temperature coefficient thermistor NTC2, and the second resistor 310. One end of the fourth capacitor 330 is connected to the ground GND, and the other end is connected between the power supply VCC and the second negative temperature coefficient thermistor NTC2.

[0061] Specifically, the control unit 500 obtains a signal from a common end of the second capacitor 320 , the second negative temperature coefficient thermistor NTC2 , and the second resistor 310 as the second signal.

[0062] S204: The first compensation signal and the second compensation signal are used to compensate the initial signal under the current refrigerant leakage environment to obtain a detection reference value under the current environment.

[0063] Optionally, in another embodiment of the present application, an implementation of step S204 is as follows: Fig. 9 As shown, including:

[0064] S901. A control unit determines a first compensation value under a current refrigerant leakage environment according to an initial signal and a first compensation signal under a current refrigerant leakage environment.

[0065] In the specific implementation process of the present application, the control unit can, but is not limited to, differentiate the initial signal under the current refrigerant leakage environment, i.e., the signals detected by the refrigerant leakage detection probe unit and the reference probe unit respectively; then, the control unit determines the first compensation coefficient based on the current signal change value and the absolute enthalpy humidity under the current temperature and humidity; finally, the control unit determines the first compensation value under the current refrigerant leakage environment based on the first compensation coefficient and the first compensation signal under the current refrigerant leakage environment.

[0066] Among them, it can be known from the above embodiment that the initial signal VT1 under the current refrigerant leakage environment = (V2-V1) × amplification factor + bias voltage. The signal VT0 under the zero concentration refrigerant environment is a preset initial value, which is preset by technicians and experts and is not limited here.

[0067] Then, the current signal change value The absolute enthalpy humidity M at the current temperature and humidity is determined according to the first compensation signal under the current refrigerant leakage environment, and the first compensation coefficient By M and Determine the first compensation coefficient Multiplying by the absolute enthalpy and humidity should be close to ΔVT to obtain the first compensation coefficient Then, the first compensation coefficient The product of the absolute enthalpy and humidity at the current temperature and humidity is taken as the first compensation value X.

[0068] S902: The control unit determines a second compensation coefficient under the current refrigerant leakage environment according to the second compensation signal.

[0069] It can be understood that under normal and stable conditions, the partial pressure difference ΔV between NTC1 and NTC2 at both ends of the refrigerant leakage detection probe unit 110 and the reference probe unit 120 is NTC =0, when the temperature changes, due to the inconsistent temperature responses at both ends of the refrigerant leakage detection probe unit 110 and the reference probe unit 120, the temperature on the side with the hole will be higher, so V NTC1 Will be better than V NTC2 larger, making ΔV NTC >0.

[0070] In the specific implementation process of the present application, the second compensation signal ΔV in the current refrigerant leakage environment may be, but is not limited to, NTC is 0, the control unit determines the second compensation coefficient under the current refrigerant leakage environment is 1; if the second compensation signal ΔV in the current refrigerant leakage environment NTC is not 0, the control unit uses the second compensation coefficient corresponding to the second compensation signal under the current refrigerant leakage environment as the second compensation coefficient under the current refrigerant leakage environment according to the preset correspondence between the second compensation signal and the second compensation coefficient. .

[0071] The corresponding relationship between the preset second compensation signal and the second compensation coefficient is preset and changed by technicians and experts, and is not limited here.

[0072] S903: The control unit determines a detection reference value under the current environment according to the initial signal under the current refrigerant leakage environment, the first compensation value under the current refrigerant leakage environment, and the second compensation coefficient under the current refrigerant leakage environment.

[0073] In the specific implementation process of the present application, the control unit can, but is not limited to, use the product of the first compensation value under the current refrigerant leakage environment and the second compensation coefficient under the current refrigerant leakage environment as the target compensation value under the current refrigerant leakage environment; the control unit uses the sum of the initial signal under the current refrigerant leakage environment and the target compensation value under the current refrigerant leakage environment as the detection reference value under the current environment.

[0074] That is, the calculation method of the target compensation value X` under the current refrigerant leakage environment is: X`=X· , the calculation method of the real signal value VOUT1` in the current environment is VOUT1`=VT1+X`. Through the second compensation coefficient The first compensation value X is further corrected to obtain the target compensation value X', and then the initial signal under the current refrigerant leakage environment is compensated according to X', thereby reducing the influence of concentration false alarm caused by temperature imbalance at both ends of the probe.

[0075] Optionally, in another embodiment of the present application, after obtaining the detection reference value of the current environment, the refrigerant concentration in the current environment is determined based on the correspondence between the detection reference value in the current environment and the refrigerant concentration; and whether a refrigerant leakage occurs in the current environment is determined based on the refrigerant concentration in the current environment.

[0076] It should be noted that the signal mentioned in all the above technical solutions of the present application can be the voltage or current signal conversion value of the collected parameter signal, or it can be an AD value, etc., as long as a unified benchmark is used during the compensation process. Among them, the control unit determines whether a refrigerant leak occurs in the current environment based on the refrigerant concentration in the current environment.

[0077] Specifically, a refrigerant concentration threshold may be set, but is not limited to, and if the refrigerant concentration in the current environment is greater than the refrigerant concentration threshold, it is determined that a refrigerant leak occurs in the current environment. If the refrigerant concentration in the current environment is not greater than the refrigerant concentration threshold, it is determined that no refrigerant leak occurs in the current environment, which is not limited here.

[0078] In the specific implementation process of the present application, the control unit can, but is not limited to, use the difference between the detection reference value of the current environment and the signal value in the environment without refrigerant leakage as the incremental signal value in the current environment; the control unit uses the refrigerant concentration corresponding to the incremental signal in the current environment as the refrigerant concentration in the current environment based on the corresponding relationship between the preset incremental signal value and the refrigerant concentration.

[0079] Among them, the compensated signal value VOUT0 in the zero-concentration refrigerant environment is a preset initial value, which is preset and changed by technicians, experts, etc., and is not limited here. The corresponding relationship between the preset incremental signal value and the refrigerant concentration is preset and changed by technicians, experts, etc., and is not limited here. It can be understood that the refrigerant concentration corresponding to VOUT0 is 0.

[0080] Specifically, the calculation method of the incremental signal value ∆VOUT` in the current environment is: ∆VOUT`=VOUT1`-VOUT0.

[0081] For example, in a specific application process of the present application, the resistance of the first resistor is 12000 ohms, and the capacitance of the first capacitor is 100 picofarads.

[0082] Exemplarily, in the specific application process of the present application, the capacitance of the third capacitor is 0.1 microfarad.

[0083] For example, in a specific application process of the present application, the resistance of the second resistor is 12000 ohms, and the capacitance of the second capacitor is 100 picofarads.

[0084] Exemplarily, in the specific application process of the present application, the capacitance of the fourth capacitor is 0.1 microfarad.

[0085] It can be seen from the above scheme that the present application provides a compensation method for the detection signal of a refrigerant sensor and a refrigerant sensor, by setting the first temperature change detection unit at a position capable of detecting the temperature change signal in the environment where the current refrigerant leakage detection probe unit is located, obtaining the first signal, and setting the second temperature change detection unit at a position capable of detecting the temperature change signal in the environment where the current reference probe unit is located, obtaining the second signal, taking the difference between the first signal and the second signal as the second compensation signal, after obtaining the second compensation signal in the current refrigerant leakage environment, the control unit combines the second compensation signal and the first compensation signal to jointly perform signal compensation on the initial signal in the current refrigerant leakage environment, and obtains the detection reference value in the current environment. Thereby reducing the influence of false alarms of concentration caused by the temperature imbalance at both ends of the probe.

[0086] Although the subject matter has been described in language specific to structural features and / or method logic actions, it should be understood that the subject matter defined in this application is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing this application.

[0087] It should be noted that there is no particular order for step S201, step S202, and step S203. Figure 2 The sequence of steps is merely illustrated by way of example. In actual application, step S201, step S202 and step S203 may be performed simultaneously or in other sequences, for example: first execute step S201, then execute step S202, and finally execute step S203; first execute step S201, then execute step S203, and finally execute step S202; first execute step S202, then execute step S201, and finally execute step S203; first execute step S202, then execute step S203, and finally execute step S201; first execute step S203, then execute step S201, and finally execute step S202; first execute step S203, then execute step S202, and finally execute step S201; etc., and no limitation is given here.

[0088] Similarly, there is no particular order for step S901 and step S902. In actual application, step S901 and step S902 can be performed simultaneously, which is not limited here.

[0089] 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 method 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, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A method for compensating a detection signal of a refrigerant sensor, applied to a refrigeration system, wherein the refrigeration system comprises a refrigerant sensor and a control unit, and is characterized in that: The refrigerant sensor at least includes a refrigerant leakage detection unit, a first temperature change detection unit, a second temperature change detection unit and a temperature and humidity compensation unit; the refrigerant leakage detection unit includes a refrigerant detection probe unit and a reference probe unit; The refrigerant leakage detection method comprises: The refrigerant leakage detection unit detects the current refrigerant leakage environment and obtains an initial signal; The temperature and humidity compensation unit detects the temperature and humidity changes in the current refrigerant leakage environment to obtain a first compensation signal; The first temperature change detection unit detects a temperature change signal in the environment where the refrigerant leakage detection probe unit is currently located to obtain a first signal; The second temperature change detection unit detects a temperature change signal in the environment where the reference probe unit is currently located to obtain a second signal; Obtain a second compensation signal through the first signal and the second signal; The first compensation signal and the second compensation signal compensate the initial signal to obtain a detection reference value under the current environment.

2. The method for compensating the detection signal of the refrigerant sensor according to claim 1, characterized in that: The refrigerant leakage detection unit further includes an operational amplifier unit. The refrigerant leakage detection unit detects the current refrigerant leakage environment and obtains an initial signal, including: The signals detected by the refrigerant leakage detection probe unit and the reference probe unit are differentiated to obtain a differential signal under the current refrigerant leakage environment; The differential signal under the current refrigerant leakage environment is processed by operational amplifier to obtain the initial signal.

3. The compensation method for the refrigerant sensor detection signal according to claim 1, characterized in that: The first compensation signal and the second compensation signal compensate the initial signal to obtain a detection reference value under the current environment, including: The control unit determines a first compensation value under the current refrigerant leakage environment according to the initial signal and the first compensation signal under the current refrigerant leakage environment; The control unit determines a second compensation coefficient under the current refrigerant leakage environment according to the second compensation signal; The control unit determines a detection reference value under the current environment according to an initial signal under the current refrigerant leakage environment, a first compensation value under the current refrigerant leakage environment, and a second compensation coefficient under the current refrigerant leakage environment.

4. The method for compensating a refrigerant sensor detection signal according to claim 3, characterized in that: The control unit determines the first compensation value under the current refrigerant leakage environment according to the initial signal and the first compensation signal under the current refrigerant leakage environment, and at least includes: The control unit determines a first compensation coefficient according to an initial signal under a current refrigerant leakage environment and absolute enthalpy and humidity under a current temperature and humidity; The control unit determines a first compensation value under the current refrigerant leakage environment according to the first compensation coefficient and the first compensation signal under the current refrigerant leakage environment.

5. The method for compensating a refrigerant sensor detection signal according to claim 3, characterized in that: The control unit determines a second compensation coefficient under the current refrigerant leakage environment according to the second compensation signal: If the second compensation signal under the current refrigerant leakage environment is 0, the control unit determines that the second compensation coefficient under the current refrigerant leakage environment is 1; If the second compensation signal under the current refrigerant leakage environment is not 0, the control unit uses the second compensation coefficient corresponding to the second compensation signal under the current refrigerant leakage environment as the second compensation coefficient under the current refrigerant leakage environment according to the preset correspondence between the second compensation signal and the second compensation coefficient.

6. The method for compensating a refrigerant sensor detection signal according to claim 3, characterized in that: The control unit determines the zero concentration signal value under the current environment according to the initial signal under the current refrigerant leakage environment, the first compensation value under the current refrigerant leakage environment, and the second compensation coefficient under the current refrigerant leakage environment, at least including: The control unit uses the product of the first compensation value under the current refrigerant leakage environment and the second compensation coefficient under the current refrigerant leakage environment as the target compensation value under the current refrigerant leakage environment; The control unit uses the sum of the initial signal under the current refrigerant leakage environment and the target compensation value under the current refrigerant leakage environment as the detection reference value under the current environment.

7. The method for compensating a refrigerant sensor detection signal according to claim 1, characterized in that: Said After the first compensation signal and the second compensation signal compensate the initial signal to obtain the detection reference value under the current environment, the method further includes: Determine the refrigerant concentration in the current environment based on the corresponding relationship between the detection reference value in the current environment and the refrigerant concentration; Determine whether refrigerant leakage occurs in the current environment based on the refrigerant concentration in the current environment.

8. The method for compensating a refrigerant sensor detection signal according to claim 1, characterized in that: The first temperature change detection unit includes: a first negative temperature coefficient thermistor, a first resistor and a first capacitor; Wherein, the first negative temperature coefficient thermistor is connected to a power supply and one end of the first resistor respectively; the other end of the first resistor is grounded; One end of the first capacitor is connected between the first negative temperature coefficient thermistor and the first resistor, and the other end is connected between the first resistor and ground; The control unit is connected to a common end of the first capacitor, the first negative temperature coefficient thermistor, and the first resistor; The control unit acquires a signal from a common end of the first capacitor, the first negative temperature coefficient thermistor, and the first resistor as a first signal.

9. The method for compensating a refrigerant sensor detection signal according to claim 1, characterized in that: The second temperature change detection unit includes: a second negative temperature coefficient thermistor, a second resistor and a second capacitor; Wherein, the second negative temperature coefficient thermistor is connected to the power supply and one end of the second resistor respectively; the other end of the second resistor is grounded; One end of the second capacitor is connected between the second negative temperature coefficient thermistor and the second resistor, and the other end is connected between the second resistor and ground; The control unit is connected to a common end of the second capacitor, the second negative temperature coefficient thermistor, and the second resistor; The control unit obtains a signal from a common end of the second capacitor, the second negative temperature coefficient thermistor, and the second resistor as a second signal.

10. A refrigeration system, comprising a refrigerant sensor and a control unit, characterized in that: The refrigerant sensor includes a refrigerant leakage detection unit, a first temperature change detection unit, a second temperature change detection unit and a temperature and humidity compensation unit; The refrigerant leakage detection unit includes a refrigerant leakage detection probe unit and a reference probe unit; The refrigerant leakage detection unit can be used to obtain an initial signal under the current refrigerant leakage environment; The temperature and humidity compensation unit can be used to obtain a first compensation signal under the current refrigerant leakage environment; wherein the first compensation signal is a temperature and humidity change signal under the current refrigerant leakage environment; The position where the first temperature change detection unit is set can be used to detect the temperature change signal of the environment where the refrigerant leakage detection probe unit is currently located, and use it as the first signal; The position where the second temperature change detection unit is set can be used to detect the temperature change signal of the environment where the current reference probe unit is located, and use it as the second signal; The control unit can be used to obtain a second compensation signal under the current refrigerant leakage environment, wherein the second compensation signal under the current refrigerant leakage environment is the difference between the first signal and the second signal; The control unit can also compensate the initial signal under the current refrigerant leakage environment through the first compensation signal and the second compensation signal to obtain the detection reference value under the current environment.

Images