Heat pump system foolproof detection method and device

Abstract

The present invention discloses a foolproof detection method and device for a heat pump system. The method includes: obtaining the first temperature of each temperature sensor when the control valve is at a first set opening, the second temperature of each temperature sensor when the control valve is at a second set opening, the third temperature of each temperature sensor when the control valve is at a third set opening, and the fourth temperature of each temperature sensor when the control valve is at a fourth set opening; determining the actual correspondence between each temperature sensor and each port based on the first, second, third, and fourth temperatures output through each port; and then controlling the operating mode of the heat pump system based on the matching between the actual correspondence between each temperature sensor and the port and the preset correspondence. Each temperature sensor in the heat pump system is actually calibrated and matched with the system's pre-calibrated settings to avoid temperature sensor connection errors.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump systems, and in particular to a fool-proof detection method and device for heat pump systems. Background Art

[0002] In the heat pump system, temperature sensors are provided at various locations to obtain the temperature at various locations in the heat pump system so that a controller in the heat pump system can control the operation of the heat pump system according to the various temperatures.

[0003] The actual location of each temperature sensor must be completely consistent with the controller's port definition. Otherwise, the heat pump system's control process will be disrupted, and even malfunctions and abnormal operation may damage the unit. In the heat pump manufacturing industry, most controller wiring is not fool-proof, resulting in temperature sensors being connected to the wrong port or placed in the wrong position, causing abnormal unit operation. Summary of the Invention

[0004] The present invention provides a fool-proof detection method and device for a heat pump system, which can be used to perform actual calibration on each temperature sensor in the heat pump system and match the calibration with the pre-calibration of the system to avoid temperature sensor connection errors.

[0005] According to one aspect of the present invention, a fool-proof detection method for a heat pump system is provided, the heat pump system comprising a compressor, a four-way valve, a control valve, a first heat exchanger, and a second heat exchanger; the output end of the compressor is connected to the first end of the four-way valve, the second end of the four-way valve is connected to the first end of the first heat exchanger, the second end of the first heat exchanger is connected to the first end of the control valve, the second end of the control valve is connected to the first end of the second heat exchanger, the second end of the second heat exchanger is connected to the third end of the four-way valve, and the fourth end of the four-way valve is connected to the input end of the compressor; wherein the first end and the second end of the first heat exchanger are in communication, in a heating mode, the first end and the second end of the four-way valve are in communication, and the third end and the fourth end of the four-way valve are in communication, and in a cooling mode, the first end and the third end of the four-way valve are in communication, and the second end and the fourth end of the four-way valve are in communication; the first heat exchanger further comprises a water inlet and a water outlet, and the water inlet and the water outlet are in communication;

[0006] A temperature sensor is provided on the output end of the compressor, the water inlet end, and the second heat exchanger respectively; the heat pump system further comprises a mainboard, the mainboard comprises a plurality of ports, and the ports are provided correspondingly to the temperature sensors;

[0007] The foolproof detection method of the heat pump system includes:

[0008] controlling the heat pump system to operate in a heating mode, and at an initial moment when the heat pump system enters the heating mode, controlling the opening of the control valve to be a first set opening, and obtaining a first temperature of each temperature sensor of the control valve at the first set opening;

[0009] controlling the opening of the control valve to decrease from the first set opening to a second set opening, and obtaining a second temperature of each temperature sensor when the opening of the control valve is the second set opening;

[0010] controlling the heat pump system to operate in the cooling mode, and at an initial moment when the heat pump system enters the cooling mode, controlling the opening of the control valve to be a third set opening, and obtaining a third temperature of each temperature sensor of the control valve at the third set opening;

[0011] controlling the opening of the control valve to decrease from the third set opening to a fourth set opening, and obtaining a fourth temperature of each temperature sensor when the opening of the control valve is the fourth set opening;

[0012] determining an actual correspondence between each temperature sensor and each port according to each first temperature, each second temperature, each third temperature, and each fourth temperature outputted through each port;

[0013] The working mode of the heat pump system is controlled according to the matching of the actual corresponding relationship between each temperature sensor and the port and the preset corresponding relationship.

[0014] Optionally, determining the actual correspondence between each temperature sensor and each port according to each first temperature, each second temperature, each third temperature, and each fourth temperature output through each port includes:

[0015] Calibrate the temperature sensor corresponding to the port that outputs the highest temperature among the second temperature and the fourth temperature as the first temperature sensor; wherein the first temperature sensor is the temperature sensor at the output end of the compressor;

[0016] The temperature sensor corresponding to the port that outputs the fourth temperature that is only lower than the maximum temperature among all the fourth temperatures is calibrated as the second temperature sensor; the maximum temperature is the highest temperature among the second temperatures and the fourth temperatures, and the second temperature sensor is the temperature sensor at the second heat exchanger;

[0017] For each port, the absolute value of the difference between the first temperature and the second temperature outputted is used as the first temperature difference, the absolute value of the difference between the third temperature and the fourth temperature outputted is used as the second temperature difference, and the average value of the first temperature difference and the second temperature difference is used as the average temperature difference;

[0018] The temperature sensor corresponding to the smallest average temperature difference corresponding to the remaining ports except the calibrated port is calibrated as the third temperature sensor, wherein the third temperature sensor is the temperature sensor at the water inlet end.

[0019] Optionally, a temperature sensor is provided within a set distance from the heat pump system;

[0020] Before controlling the heat pump system to operate in the heating mode, the method further includes:

[0021] Determine a first temperature average value by using the temperatures obtained by each temperature sensor before the heat pump system is started;

[0022] After calibrating the second temperature sensor and before calibrating the third temperature sensor, the method further includes:

[0023] Except for the port corresponding to the first temperature sensor and the port corresponding to the second temperature sensor, the temperature sensor corresponding to the port whose second temperature and fourth temperature output among the remaining ports are closest to the first temperature average value is calibrated as a fourth temperature sensor, wherein the fourth temperature sensor is a temperature sensor for obtaining the ambient temperature.

[0024] Optionally, a temperature sensor is provided on the connecting pipeline between the second end of the first heat exchanger and the first end of the control valve, the input end of the compressor, and the water outlet end;

[0025] After calibrating the third temperature sensor, the following steps are also performed:

[0026] For each port, the average of the second temperature and the fourth temperature output by the port is used as the second temperature average value; except for the calibrated port, the temperature sensor corresponding to the port whose second temperature output by each remaining port is greater than or equal to the second temperature corresponding to the third temperature sensor, whose fourth temperature is less than or equal to the fourth temperature corresponding to the third temperature sensor, and whose second temperature average value is closest to the second temperature average value of the third temperature sensor is calibrated as the fifth temperature sensor; the fifth temperature sensor is the temperature sensor at the water outlet;

[0027] The temperature sensor corresponding to the smaller absolute value of the difference between the first temperature and the second temperature output from the remaining ports except the calibrated port is calibrated as the sixth temperature sensor, and the temperature sensor corresponding to the last remaining port is calibrated as the seventh temperature sensor; the sixth temperature sensor is the temperature sensor on the connecting pipe between the second end of the first heat exchanger and the first end of the control valve, and the seventh temperature sensor is the temperature sensor at the input end of the compressor.

[0028] Optionally, controlling the opening of the control valve to decrease from the first set opening to a second set opening includes:

[0029] After the heat pump system operates in the heating mode for a first set time period, the control valve is controlled to decrease from the first set opening degree to the second set opening degree at a first set rate.

[0030] Optionally, controlling the opening of the control valve to decrease from the third set opening to a fourth set opening includes:

[0031] After the heat pump system operates in the cooling mode for a second set time period, the control valve is controlled to decrease from the third set opening to the fourth set opening at a second set rate.

[0032] Optionally, the foolproof detection method for the heat pump system further includes:

[0033] When the heat pump system is powered off for a preset period of time and then powered on again, the heat pump system is controlled to perform the detection of the fool-proof detection method.

[0034] Optionally, the operating mode of the heat pump system includes a normal mode and a fault mode. According to the matching between the actual correspondence between each temperature sensor and the port and the preset correspondence, controlling the operating mode of the heat pump system includes:

[0035] If the actual correspondence between at least one port and the temperature sensor does not match the preset correspondence, controlling the heat pump system to be in a fault mode;

[0036] If the actual correspondence between each port and the temperature sensor matches the preset correspondence, the heat pump system is controlled to be in normal mode.

[0037] According to another aspect of the present invention, a fool-proof detection device for a heat pump system is provided, the heat pump system comprising a compressor, a four-way valve, a control valve, a first heat exchanger, and a second heat exchanger; the output end of the compressor is connected to the first end of the four-way valve, the second end of the four-way valve is connected to the first end of the first heat exchanger, the second end of the first heat exchanger is connected to the first end of the control valve, the second end of the control valve is connected to the first end of the second heat exchanger, the second end of the second heat exchanger is connected to the third end of the four-way valve, and the fourth end of the four-way valve is connected to the input end of the compressor; wherein the first end and the second end of the first heat exchanger are communicated, in a heating mode, the first end and the second end of the four-way valve are communicated, and the third end and the fourth end of the four-way valve are communicated, and in a cooling mode, the first end and the third end of the four-way valve are communicated, and the second end and the fourth end of the four-way valve are communicated; the first heat exchanger also includes a water inlet and a water outlet, and the water inlet and the water outlet are communicated;

[0038] A temperature sensor is provided on the output end of the compressor, the water inlet end, and the second heat exchanger respectively; the heat pump system further comprises a mainboard, the mainboard comprises a plurality of ports, and the ports are provided correspondingly to the temperature sensors;

[0039] The foolproof detection device of the heat pump system includes:

[0040] a first temperature acquisition module, configured to control the heat pump system to operate in a heating mode, and, at an initial moment when the heat pump system enters the heating mode, control the opening of the control valve to be a first set opening, and acquire a first temperature of each temperature sensor of the control valve at the first set opening;

[0041] a second temperature acquisition module, configured to control the opening of the control valve to decrease from the first set opening to a second set opening, and acquire a second temperature of each temperature sensor when the opening of the control valve is the second set opening;

[0042] a third temperature acquisition module, configured to control the heat pump system to operate in the cooling mode, and, at an initial moment when the heat pump system enters the cooling mode, control the opening of the control valve to be a third set opening, and acquire a third temperature of each temperature sensor when the control valve is at the third set opening;

[0043] a fourth temperature acquisition module, configured to control the opening of the control valve to decrease from the third set opening to a fourth set opening, and acquire a fourth temperature of each temperature sensor when the opening of the control valve is the fourth set opening;

[0044] a calibration module, configured to determine an actual correspondence between each of the temperature sensors and each of the ports based on each of the first temperatures, each of the second temperatures, each of the third temperatures, and each of the fourth temperatures outputted through each of the ports;

[0045] The mode control module is used to control the working mode of the heat pump system according to the matching situation between the actual corresponding relationship between each temperature sensor and the port and the preset corresponding relationship.

[0046] Optionally, the calibration module includes:

[0047] a first calibration unit, configured to calibrate a temperature sensor corresponding to a port outputting the highest temperature among the second temperatures and the fourth temperatures as a first temperature sensor; wherein the first temperature sensor is a temperature sensor at an output end of the compressor;

[0048] A second calibration unit calibrates a temperature sensor corresponding to a port that outputs a fourth temperature that is only lower than the maximum temperature among all the fourth temperatures as a second temperature sensor; the maximum temperature is the highest temperature among the second temperatures and the fourth temperatures, and the second temperature sensor is the temperature sensor at the second heat exchanger;

[0049] The third calibration unit is used to, for each port, use the absolute value of the difference between the first temperature and the second temperature output as the first temperature difference, the absolute value of the difference between the third temperature and the fourth temperature output as the second temperature difference, and the average value of the first temperature difference and the second temperature difference as the average temperature difference; calibrate the temperature sensor corresponding to the smallest average temperature difference corresponding to each port except the calibrated port as the third temperature sensor, wherein the third temperature sensor is the temperature sensor at the water inlet end.

[0050] The technical solution of the embodiments of the present invention determines the actual correspondence between each temperature sensor and each port based on the first and second temperatures of each temperature sensor acquired in heating mode, and the third and fourth temperatures of each temperature sensor acquired in cooling mode, combined with the temperature variation characteristics at different locations. Based on whether the actual correspondence between the temperature sensor and the port matches the preset correspondence, it identifies whether any sensor is incorrectly plugged in, thereby preventing system failures caused by incorrect temperature sensor plugging.

[0051] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0053] Figure 1 A schematic structural diagram of a heat pump system provided by an embodiment of the present invention;

[0054] Figure 2 A flow chart of a fool-proof detection method for a heat pump system provided by an embodiment of the present invention;

[0055] Figure 3 A flow chart of another fool-proof detection method for a heat pump system provided by an embodiment of the present invention;

[0056] Figure 4A schematic structural diagram of a fool-proof detection device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0057] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0058] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0059] Figure 1 A schematic diagram of a heat pump system according to an embodiment of the present invention is provided. Figure 1 , the heat pump system includes:

[0060] Compressor 1, four-way valve 2, control valve 6, first heat exchanger 3, second heat exchanger 7; the output end U1 of the compressor 1 is connected to the first end of the four-way valve 2, the second end of the four-way valve 2 is connected to the first end of the first heat exchanger 3, the second end of the first heat exchanger 3 is connected to the first end of the control valve 6, the second end of the control valve 6 is connected to the first end of the second heat exchanger 7, the second end of the second heat exchanger 7 is connected to the third end of the four-way valve 2, and the fourth end of the four-way valve 2 is connected to the input end I1 of the compressor 1; wherein, the first end and the second end of the first heat exchanger 3 are connected, in heating mode, the first end and the second end of the four-way valve 2 are connected, and the third end and the fourth end of the four-way valve 2 are connected, in cooling mode, the first end and the third end of the four-way valve 2 are connected, and the second end and the fourth end of the four-way valve 2 are connected; the first heat exchanger 3 also includes a water inlet end I2 and a water outlet end U2, and the water inlet end I2 and the water outlet end U2 are connected. Optionally, the heat pump system further includes an economizer 4 and an auxiliary valve 5 connected in sequence between the first heat exchanger 3 and the first end of the control valve 6, and a gas-liquid separator 8 connected between the fourth end of the four-way valve 2 and the input end I1 of the compressor 1.

[0061] A temperature sensor is provided at the output terminal U1, the water inlet terminal I2, and the second heat exchanger 7 of the compressor 1. The heat pump system also includes a mainboard, which includes multiple ports corresponding to the temperature sensors. In an optional embodiment, the ports on the mainboard correspond one-to-one with the temperature sensors. In heating mode, the first heat exchanger 3 functions as a condenser and the second heat exchanger 7 functions as an evaporator. In cooling mode, the first heat exchanger 3 functions as an evaporator and the second heat exchanger 7 functions as a condenser.

[0062] In heating mode, the high-temperature, high-pressure gas output by the compressor 1 enters the first heat exchanger 3 through the second end of the four-way valve 2 for heat exchange. After the heat exchange is completed, a high-pressure, medium-temperature liquid is output to the control valve 6. The control valve 6 outputs a two-phase liquid and gas to the second heat exchanger 7 for heat exchange. The second heat exchanger 7 outputs a low-temperature, low-pressure gas, which is transmitted back to the input end I1 of the compressor 1 through the four-way valve 2 and the gas-liquid separator 8. In cooling mode, the high-temperature, high-pressure gas output by the compressor 1 enters the second heat exchanger 7 for heat exchange, and then a high-pressure, medium-temperature liquid is output to the control valve 6. The control valve 6 outputs a two-phase liquid and gas to the first heat exchanger 3 for heat exchange. The first heat exchanger 3 outputs a low-temperature, low-pressure gas, which is transmitted back to the input end I1 of the compressor 1 through the four-way valve 2 and the gas-liquid separator 8.

[0063] Figure 2 This is a flow chart of a foolproof detection method for a heat pump system provided by an embodiment of the present invention. This embodiment can be applied to identify whether there is a temperature sensor with a wrong plug in the heat pump system. This method can be executed by a foolproof detection device of the heat pump system. Figure 1 As shown, the method includes:

[0064] S110: Control the heat pump system to operate in the heating mode, and at the initial moment when the heat pump system enters the heating mode, control the opening of the control valve 6 to be a first set opening, and obtain the first temperature of each temperature sensor of the control valve 6 at the first set opening through each port.

[0065] Each temperature sensor is connected to a corresponding port, and different ports are connected to different temperature sensors. The temperature sensor transmits the acquired temperature to the mainboard of the heat pump system through the connected port.

[0066] At a first moment, the heat pump system is controlled to enter heating mode. When controlling the heat pump system to enter heating mode, the mainboard can determine the opening degree of the corresponding control valve 6, i.e., the first set opening degree, based on the parameter information of the heat pump system at the first moment, and control the control valve 6 to open to the first set opening degree. At the first moment, after the control valve 6 is controlled to open to the first set opening degree, the first temperature of each corresponding temperature sensor is obtained through each port. For each temperature sensor, the temperature when the control valve 6 is opened to the first set opening degree is the first temperature.

[0067] S120: Control the opening of the control valve 6 to decrease from the first set opening to the second set opening, and obtain the second temperature of each temperature sensor when the opening of the control valve 6 is the second set opening.

[0068] The second set opening is smaller than the first set opening. For example, the second set opening can be 70%, 65%, or 40% of the first set opening. The ratio between the second set opening and the first set opening is not specifically limited. At the second moment, when the opening of control valve 6 reaches the second set opening, the temperature of each temperature sensor at the second moment is acquired through each port. For each temperature sensor, the temperature when the opening of control valve 6 reaches the second set opening is the second temperature.

[0069] S130: Control the heat pump system to operate in the cooling mode, and at the initial moment when the heat pump system enters the cooling mode, control the opening of the control valve to be a third set opening, and obtain the third temperature of each temperature sensor at the third set opening of the control valve through each port.

[0070] When the heat pump system operates in the heating mode and the opening of the control valve is reduced from the first set opening to the second set opening for a preset pause time, such as five minutes, the heat pump system is controlled to operate in the cooling mode.

[0071] At the third moment, the heat pump system is controlled to enter cooling mode. Based on the parameter information of the heat pump system at the second moment, the mainboard of the heat pump system can determine the opening degree of control valve 6 at the third moment, i.e., the third set opening degree, which is the initial moment when the heat pump system enters cooling mode. The mainboard of the heat pump system can then control control valve 6 to open to the third set opening degree. After control valve 6 is opened to the third set opening degree at the third moment, the temperature of each temperature sensor at the third moment is acquired through each port. For each temperature sensor, the temperature when control valve 6 is opened to the third set opening degree is the third temperature.

[0072] S140: controlling the opening of the control valve 6 to decrease from the third set opening to a fourth set opening, and acquiring, through each port, a fourth temperature of each temperature sensor when the opening of the control valve 6 is the fourth set opening.

[0073] The fourth set opening is smaller than the third set opening. For example, the fourth set opening can be 70%, 65%, or 40% of the third set opening. The ratio between the fourth set opening and the third set opening is not specifically limited. At a fourth moment, the opening of control valve 6 reaches the fourth set opening, and the temperature of each temperature sensor at the fourth moment is obtained through each port. For each temperature sensor, the temperature when the opening of control valve 6 reaches the fourth set opening is the fourth temperature.

[0074] The first set opening and the second set opening may be the same or different in size. The specific opening size is related to parameter information of the heat pump system, such as ambient temperature, temperature of the compressor output end, temperature of the water inlet end, etc.

[0075] S150: Determine actual correspondences between temperature sensors and ports according to first temperatures, second temperatures, third temperatures, and fourth temperatures outputted through ports.

[0076] Exemplarily, the heat pump system pre-assigns fixed ports to each temperature sensor at each location. Exemplarily, the preset correspondence is as follows: the first port corresponds to the temperature sensor at the output terminal U1 of the compressor 1, the second port corresponds to the temperature sensor at the second heat exchanger 7, and the third port corresponds to the temperature sensor at the water inlet terminal I2. Each time the system is powered on, the temperature at the corresponding location in the heat pump system is directly represented by the temperature output from each port, thereby achieving control of the heat pump system.

[0077] The corresponding temperatures of temperature sensors at different locations change in different modes and when the opening of the control valve 6 changes. For example, because the output terminal U1 of the compressor 1 outputs relatively high-temperature gas regardless of whether it is in cooling mode or heating mode, the temperature sensor corresponding to the port that outputs the highest temperature among the second temperatures or the fourth temperatures is determined to be the sensor at the output terminal U1 of the compressor 1. When the opening of the control valve 6 changes from the first set opening to the second set opening or from the third set opening to the fourth set opening, the temperature sensor corresponding to the port with the smallest temperature change during the change of the opening of the control valve 6 is calibrated as the temperature sensor at the water inlet terminal I2. The remaining temperature sensors are calibrated as the temperature sensors at the input of the second heat exchanger 7.

[0078] S160: Controlling the working mode of the heat pump system according to the matching between the actual correspondence between each temperature sensor and the port and the preset correspondence.

[0079] The heat pump system's operating modes include normal mode and fault mode. For example, if, in S150, the port outputting the highest of the second or fourth temperatures is the first port, and the port outputting the smallest temperature change during the change in the opening of control valve 6 is the second port, then the actual corresponding relationship is: the first port corresponds to the temperature sensor at the output terminal U1 of compressor 1, the second port corresponds to the temperature sensor at the second heat exchanger 7, and the third port corresponds to the temperature sensor at the water inlet terminal I2. If the actual corresponding relationship is consistent with the preset corresponding relationship, the heat pump system is controlled to operate in normal mode, executing the power-on command or maintaining the original standby state. If the port that outputs the highest temperature among the second temperatures or the fourth temperatures in S150 is the second port, and the port that outputs the smallest temperature change during the change in the opening of the control valve 6 is the first port, then the actual preset correspondence is: the second port corresponds to the temperature sensor at the output end U1 of the compressor 1, the first port corresponds to the temperature sensor at the second heat exchanger 7, and the third port corresponds to the temperature sensor at the water inlet end I2. Then, the actual correspondence between the first port and the temperature sensor does not match the preset correspondence, and the actual correspondence between the second port and the temperature sensor does not match the preset correspondence. There is a port plugging error when the temperature sensor at the output end of the compressor 1 is plugged into the mainboard port, and there is a plugging error when the temperature sensor at the second heat exchanger 7 is plugged into the mainboard port. Subsequently, when controlling the heat pump system, the temperature of the output end U1 of the compressor 1 will be mistakenly regarded as the temperature of the second heat exchanger 7, and the temperature of the second heat exchanger 7 will be mistakenly regarded as the temperature of the output end U1 of the compressor 1, causing system disorder. Therefore, the operating mode of the heat pump system is controlled to the fault mode, a "temperature sensor fault" prompt is prompted, and the heat pump system is controlled to shut down.

[0080] The technical solution of the embodiments of the present invention determines the actual correspondence between each temperature sensor and each port based on the first and second temperatures of each temperature sensor acquired in heating mode, and the third and fourth temperatures of each temperature sensor acquired in cooling mode, combined with the temperature variation characteristics at different locations. Based on whether the actual correspondence between the temperature sensor and the port matches the preset correspondence, it identifies whether any sensor is incorrectly plugged in, thereby preventing system failures caused by incorrect temperature sensor plugging.

[0081] refer to Figure 1 Furthermore, S150 includes:

[0082] The temperature sensor corresponding to the port that outputs the highest of the second and fourth temperatures is calibrated as the first temperature sensor Td, where the first temperature sensor Td is the temperature sensor at the output terminal U1 of the compressor 1. Specifically, whether the heat pump system is in cooling mode or heating mode, the highest temperature is at the output terminal U1 of the compressor 1. Therefore, based on the temperatures output by each port in cooling mode and heating mode, the temperature sensor corresponding to the port that outputs the highest temperature is calibrated as the first temperature sensor Td. For example, the three temperature sensors of the heat pump system are connected to the three ports of the mainboard in a one-to-one correspondence. If the highest temperature among the second temperature output by the first port, the second temperature output by the second port, the second temperature output by the third port, the fourth temperature output by the first port, the fourth temperature output by the second port, and the fourth temperature output by the third port is the second temperature output by the first port, then it can be determined that the first port corresponds to the first temperature sensor Td. If the highest temperature is output by the second port, then it can be determined that the second port corresponds to the first temperature sensor Td.

[0083] The temperature sensor corresponding to the port that outputs the fourth temperature that is only lower than the maximum temperature among all fourth temperatures is calibrated as the second temperature sensor Tdef. The second temperature sensor Tdef is the temperature sensor at the second heat exchanger 7. The maximum temperature is the highest of the second and fourth temperatures. Specifically, in cooling mode, the high-temperature, high-pressure gas output by compressor 1 decreases in temperature as it travels backward. Therefore, the temperature at the second heat exchanger 7, which is closest to the output terminal U1 of compressor 1, is second only to the temperature at the output terminal U1 of compressor 1. Therefore, the temperature sensor corresponding to the port that outputs the second highest temperature among all fourth temperatures is calibrated as the second temperature sensor Tdef.

[0084] When the heat pump system only includes the three temperature sensors mentioned above, the remaining temperature sensor can be calibrated as the temperature sensor at the water inlet I2. If the heat pump system also includes other temperature sensors, the following steps can be used to further calibrate the temperature sensors:

[0085] For each port, the absolute value of the difference between the output first temperature and the second temperature is taken as the first temperature difference, the absolute value of the difference between the output third temperature and the fourth temperature is taken as the second temperature difference, and the average value of the first temperature difference and the second temperature difference is taken as the average temperature difference; except for the calibrated port, the temperature sensor corresponding to the port with the smallest average temperature difference corresponding to the remaining ports is calibrated as the third temperature sensor Ti, where the third temperature sensor Ti is the temperature sensor at the water inlet end I2.

[0086] Whether in cooling or heating mode, changes in the opening of control valve 6 have minimal impact on the temperature at water inlet I2, which remains nearly constant. Therefore, the water inlet temperature sensor and the corresponding port are calibrated based on the average of the temperature differences between the two modes.

[0087] Optionally, a temperature sensor is provided within a set distance from the heat pump system. A temperature sensor is provided on the connecting pipe between the second end of the first heat exchanger 3 and the first end of the control valve 6, and on the input end I1 and the water outlet end U2 of the compressor 1. The set distance from the heat pump system may be a temperature sensor provided within a set distance from the compressor 1, for obtaining the ambient temperature at the location of the heat pump system. Figure 3 A flowchart of another fool-proof detection method for a heat pump system provided by an embodiment of the present invention is provided. Figure 3 , optionally, the method includes:

[0088] S111: Determine a first average temperature value based on the temperatures obtained by each temperature sensor before the heat pump system is started. The first average temperature value is the average value of the temperatures of each temperature sensor.

[0089] Specifically, before the heat pump system is started, temperature sensors provided at different positions are used to obtain the temperature at the corresponding positions and transmit the temperature to the corresponding connected ports, and the temperatures output by all ports are averaged as the first temperature average.

[0090] S121: Control the heat pump system to operate in a heating mode, and at the initial moment when the heat pump system enters the heating mode, control the opening of the control valve to be a first set opening, and obtain the first temperature of each temperature sensor at the first set opening of the control valve.

[0091] When the heat pump system is powered on again after being powered off for a preset period of time, the heat pump system is controlled to perform a foolproof detection method. The preset period can be 48 hours. When the heat pump system is powered on again after 48 hours of power outage, the foolproof detection method of S111-S221 is executed. 30 seconds after the heat pump system is powered on, the heat pump system is controlled to operate in heating mode, with compressor 1 running.

[0092] S131: After the heat pump system operates in the heating mode for a first set period of time, the control valve 6 is controlled to decrease from the first set opening to the second set opening at a first set rate, and the second temperature of each temperature sensor when the opening of the control valve is the second set opening is obtained through each port.

[0093] The first set time length can be 90S, that is, after the compressor 1 is turned on for 90S, the control valve 6 under normal heating operation is gradually closed, and the control valve is closed at a rate of 10% of the current opening every 30S until the opening of the control valve 6 changes to the second set opening, and the second temperature of each temperature sensor is obtained.

[0094] For example, the heat pump system operates in heating mode for three minutes. After the compressor is turned on for 90 seconds, the opening of control valve 6 is gradually closed at a rate of 10% of the current opening every 30 seconds until the heating mode ends. During the final 30 seconds of the heating mode, the control valve opening is at the second set opening, at which point the temperature of each temperature sensor is acquired.

[0095] Controlling the control valve 6 to close evenly at a certain rate can ensure that the temperature changes at various positions of the heat pump system can follow the changes in the opening of the upper control valve 6, avoiding the sudden change in the opening of the control valve 6 that causes the heat pump system to be unable to respond in time, resulting in the temperature obtained at different positions in the heat pump system no longer being representative in real time, and thus reducing the calibration accuracy of the port and sensor.

[0096] S141: Control the heat pump system to operate in the cooling mode, and at the initial moment when the heat pump system enters the cooling mode, control the opening of the control valve to be a third set opening, and obtain the third temperature of each temperature sensor at the third set opening of the control valve.

[0097] After the heat pump system ends the operation in the heating mode and a third set time period, such as 30 seconds, the heat pump system is controlled to operate in the cooling mode, and the compressor 1 is operated.

[0098] S151: After the heat pump system operates in the cooling mode for a second set time, the control valve 6 is controlled to decrease from the third set opening to the fourth set opening at a second set rate, and the fourth temperature of each temperature sensor when the opening of the control valve 6 is the fourth set opening is obtained.

[0099] After the heat pump system runs in cooling mode for a second set time, such as 90 seconds, the control valve 6 under normal cooling operation is gradually closed, and the control valve is closed at a rate of 10% of the current opening every 30 seconds until the opening of the control valve 6 changes to the fourth set opening. The fourth temperature of each temperature sensor is obtained through each port.

[0100] For example, the heat pump system operates in cooling mode for three minutes. After the compressor is turned on for 90 seconds, the opening of control valve 6 is gradually closed at a rate of 10% of the current opening every 30 seconds until the cooling mode ends. During the final 30 seconds of the cooling mode, the control valve opening is at the fourth set opening, at which point the temperature of each temperature sensor is acquired.

[0101] In cooling mode, controlling the control valve 6 to close evenly at a certain rate can ensure that the temperature changes at various positions of the heat pump system can follow the changes in the opening of the upper control valve 6, avoiding sudden changes in the opening of the control valve 6 that cause the heat pump system to be unable to respond in time, resulting in the temperature obtained at different positions in the heat pump system no longer being representative in real time, and thus reducing the calibration accuracy of the port and sensor.

[0102] S161: Calibrate the temperature sensor corresponding to the port that outputs the highest temperature among the second temperatures and the fourth temperatures as the first temperature sensor Td.

[0103] S171: Calibrate the temperature sensor corresponding to the port that outputs the fourth temperature that is only lower than the highest temperature among all fourth temperatures as the second temperature sensor Tdef.

[0104] S181: Except for the port corresponding to the first temperature sensor Td and the port corresponding to the second temperature sensor Tdef, the temperature sensor corresponding to the port whose output second temperature and fourth temperature are closest to the average value of the first temperature among the remaining ports is calibrated as a fourth temperature sensor Ta, where the fourth temperature sensor is a temperature sensor for obtaining the ambient temperature.

[0105] Specifically, the temperature sensor corresponding to the port corresponding to the temperature having the smallest absolute value of the difference between the output second temperature and the average value of the first temperature among all the second temperatures and the fourth temperatures among the remaining ports except the ports calibrated in S161 and S171 is calibrated as the fourth temperature sensor Ta.

[0106] S191: For each port, the absolute value of the difference between the output first temperature and the second temperature is used as the first temperature difference, the absolute value of the difference between the output third temperature and the fourth temperature is used as the second temperature difference, and the average value of the first temperature difference and the second temperature difference is used as the average temperature difference; except for the calibrated port, the temperature sensor corresponding to the minimum average temperature difference corresponding to the remaining ports is calibrated as the third temperature sensor Ti.

[0107] S201: For each port, the average of the second temperature and the fourth temperature output by the port is taken as the second temperature average value; except for the calibrated port, the temperature sensor corresponding to the port whose second temperature output by each remaining port is greater than or equal to the second temperature corresponding to the third temperature sensor Ti, whose fourth temperature is less than or equal to the fourth temperature corresponding to the third temperature sensor Ti, and whose second temperature average value is closest to the second temperature average value of the third temperature sensor Ti is calibrated as the fifth temperature sensor To; the fifth temperature sensor To is the temperature sensor at the water outlet U2.

[0108] In heating mode, heat exchange occurs at the first heat exchanger 3, causing the water at the water inlet I2 to absorb heat from the gas input at the first end of the first heat exchanger 3 and then be output through the water outlet U2. Therefore, the temperature at the water outlet U2 is higher than that at the water inlet I2. In cooling mode, heat exchange also occurs in the first heat exchanger 3. The water at the water inlet I2 absorbs heat from the gas input at the second end of the first heat exchanger 3 and then is output through the water outlet U2. Therefore, the temperature at the water outlet U2 is lower than that at the water inlet I2. For each port, the average of the second and fourth temperatures output by that port is used as the average second temperature for that port. For the remaining three ports, the temperature sensor corresponding to the port that simultaneously satisfies the following conditions: the output second temperature is greater than or equal to the second temperature corresponding to the third temperature sensor Ti, the fourth temperature is less than or equal to the fourth temperature corresponding to the third temperature sensor Ti, and the average second temperature is closest to the average second temperature of the third temperature sensor Ti is calibrated as the fifth temperature sensor To.

[0109] S211: Calibrate the temperature sensor corresponding to the smaller absolute value of the difference between the first and second temperatures output by the remaining ports, excluding the calibrated port, as the sixth temperature sensor Tlid. The temperature sensor corresponding to the last remaining port is calibrated as the seventh temperature sensor Ts. The sixth temperature sensor Tlid is the temperature sensor on the connecting pipe between the second end of the first heat exchanger 3 and the first end of the control valve 6. The seventh temperature sensor Ts is the temperature sensor at the input end of the compressor 1.

[0110] The remaining two ports are used to output the temperature of the connecting pipeline and the input end I1 of the compressor 1. In heating mode, as the opening degree of the control valve 6 changes, the temperature of the connecting pipeline between the second end of the first heat exchanger 3 and the first end of the control valve 6 experiences the smallest temperature change. Therefore, the temperature sensors corresponding to the remaining two ports are calibrated based on the temperature changes.

[0111] When the ambient temperature is greater than the water inlet temperature, the temperature sensor corresponding to the port with the largest temperature variation throughout the heating mode is calibrated as the seventh temperature sensor Ts. When the ambient temperature is less than or equal to the water inlet temperature, in the heating mode, the temperature sensor corresponding to the port with the smallest temperature difference compared to the water inlet I2 is calibrated as the sixth temperature sensor Tlid.

[0112] S221: If the actual correspondence between at least one port and the temperature sensor does not match the preset correspondence, the heat pump system is controlled to be in a fault mode. If the actual correspondence between each port and the temperature sensor matches the preset correspondence, the heat pump system is controlled to be in a normal mode. The operating modes of the heat pump system include a normal mode and a fault mode.

[0113] Exemplarily, the preset correspondence is as follows: the temperature sensor corresponding to the first port is the first temperature sensor Td, the temperature sensor corresponding to the second port is the second temperature sensor Tdef, the temperature sensor corresponding to the third port is the third temperature sensor Ti, the temperature sensor corresponding to the fourth port is the fourth temperature sensor Ta, the temperature sensor corresponding to the fifth port is the fifth temperature sensor To, the temperature sensor corresponding to the sixth port is the sixth temperature sensor Tlid, and the temperature sensor corresponding to the seventh port is the seventh temperature sensor Ts. If, during the actual calibration process, when calibrating the first temperature sensor Td and its corresponding port according to S161, the port outputting the highest temperature of the second and fourth temperatures is the second port, then the actual correspondence is: the temperature sensor corresponding to the second port is the first temperature sensor Td, which is inconsistent with the preset correspondence. The heat pump system is then controlled to issue a fault alarm. If the correspondences between the ports and temperature sensors determined according to S111-S211 are all consistent with the preset correspondences, then the self-test is normal.

[0114] The embodiment of the present invention also provides a foolproof detection device for a heat pump system. Figure 4 A schematic diagram of a fool-proof detection device according to an embodiment of the present invention is provided. Figure 4 , the device comprises:

[0115] a first temperature acquisition module 10 for controlling the heat pump system to operate in a heating mode, and at the initial moment when the heat pump system enters the heating mode, controlling the opening of the control valve to be a first set opening, and acquiring a first temperature of each temperature sensor at the first set opening of the control valve;

[0116] a second temperature acquisition module 20 for controlling the opening of the control valve to decrease from the first set opening to the second set opening, and acquiring a second temperature of each temperature sensor when the opening of the control valve is the second set opening;

[0117] a third temperature acquisition module 30 for controlling the heat pump system to operate in a cooling mode, and at the initial moment when the heat pump system enters the cooling mode, controlling the opening of the control valve to be a third set opening, and acquiring a third temperature of each temperature sensor at the third set opening of the control valve;

[0118] a fourth temperature acquisition module 40, configured to control the opening of the control valve to decrease from the third set opening to a fourth set opening, and to acquire a fourth temperature of each temperature sensor when the opening of the control valve is the fourth set opening;

[0119] a calibration module 50 for determining an actual correspondence between each temperature sensor and each port according to each first temperature, each second temperature, each third temperature, and each fourth temperature outputted through each port;

[0120] The mode control module 60 is used to control the working mode of the heat pump system according to the matching between the actual corresponding relationship between each temperature sensor and the port and the preset corresponding relationship.

[0121] The beneficial effects of the fool-proof detection device of the heat pump system are the same as the beneficial effects of the fool-proof detection method of the heat pump system, and will not be repeated here.

[0122] Optional calibration modules include:

[0123] a first calibration unit, configured to calibrate a temperature sensor corresponding to a port outputting the highest temperature among the second temperatures and the fourth temperatures as a first temperature sensor; wherein the first temperature sensor is a temperature sensor at an output end of the compressor;

[0124] The second calibration unit is configured to calibrate the temperature sensor corresponding to the port that outputs the fourth temperature that is only lower than the maximum temperature among all the fourth temperatures as the second temperature sensor; the maximum temperature is the highest temperature among the second temperatures and the fourth temperatures, and the second temperature sensor is the temperature sensor at the second heat exchanger;

[0125] The third calibration unit is used to, for each port, use the absolute value of the difference between the output first temperature and the second temperature as the first temperature difference, the absolute value of the difference between the output third temperature and the fourth temperature as the second temperature difference, and the average value of the first temperature difference and the second temperature difference as the average temperature difference; calibrate the temperature sensor corresponding to the smallest average temperature difference corresponding to the remaining ports except the calibrated port as the third temperature sensor, wherein the third temperature sensor is the temperature sensor at the water inlet end.

[0126] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0127] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A foolproof detection method for a heat pump system, characterized in that: The heat pump system includes a compressor, a four-way valve, a control valve, a first heat exchanger, and a second heat exchanger; the output end of the compressor is connected to the first end of the four-way valve, the second end of the four-way valve is connected to the first end of the first heat exchanger, the second end of the first heat exchanger is connected to the first end of the control valve, the second end of the control valve is connected to the first end of the second heat exchanger, the second end of the second heat exchanger is connected to the third end of the four-way valve, and the fourth end of the four-way valve is connected to the input end of the compressor; wherein, the first end and the second end of the first heat exchanger are in communication, in a heating mode, the first end and the second end of the four-way valve are in communication, and the third end and the fourth end of the four-way valve are in communication, and in a cooling mode, the first end and the third end of the four-way valve are in communication, and the second end and the fourth end of the four-way valve are in communication; the first heat exchanger also includes a water inlet and a water outlet, and the water inlet is in communication with the water outlet; A temperature sensor is provided on the output end of the compressor, the water inlet end, and the second heat exchanger respectively; the heat pump system further comprises a mainboard, the mainboard comprises a plurality of ports, and the ports are provided correspondingly to the temperature sensors; The foolproof detection method of the heat pump system includes: controlling the heat pump system to operate in a heating mode, and at an initial moment when the heat pump system enters the heating mode, controlling the opening of the control valve to be a first set opening, and obtaining a first temperature of each temperature sensor of the control valve at the first set opening; controlling the opening of the control valve to decrease from the first set opening to a second set opening, and obtaining a second temperature of each temperature sensor when the opening of the control valve is the second set opening; controlling the heat pump system to operate in the cooling mode, and at an initial moment when the heat pump system enters the cooling mode, controlling the opening of the control valve to be a third set opening, and obtaining a third temperature of each temperature sensor of the control valve at the third set opening; controlling the opening of the control valve to decrease from the third set opening to a fourth set opening, and obtaining a fourth temperature of each temperature sensor when the opening of the control valve is the fourth set opening; determining an actual correspondence between each temperature sensor and each port according to each first temperature, each second temperature, each third temperature, and each fourth temperature outputted through each port; The working mode of the heat pump system is controlled according to the matching of the actual corresponding relationship between each temperature sensor and the port and the preset corresponding relationship.

2. The foolproof detection method for a heat pump system according to claim 1, characterized in that: Determining actual correspondences between the temperature sensors and the ports according to the first temperatures, the second temperatures, the third temperatures, and the fourth temperatures outputted through the ports includes: Calibrate the temperature sensor corresponding to the port that outputs the highest temperature among the second temperature and the fourth temperature as the first temperature sensor; wherein the first temperature sensor is the temperature sensor at the output end of the compressor; The temperature sensor corresponding to the port that outputs the fourth temperature that is only lower than the maximum temperature among all the fourth temperatures is calibrated as the second temperature sensor; the maximum temperature is the highest temperature among the second temperatures and the fourth temperatures, and the second temperature sensor is the temperature sensor at the second heat exchanger; For each port, the absolute value of the difference between the first temperature and the second temperature outputted is used as the first temperature difference, the absolute value of the difference between the third temperature and the fourth temperature outputted is used as the second temperature difference, and the average value of the first temperature difference and the second temperature difference is used as the average temperature difference; The temperature sensor corresponding to the smallest average temperature difference corresponding to the remaining ports except the calibrated port is calibrated as the third temperature sensor, wherein the third temperature sensor is the temperature sensor at the water inlet end.

3. The foolproof detection method for a heat pump system according to claim 2, characterized in that: Disposing a temperature sensor within a set distance from the heat pump system; Before controlling the heat pump system to operate in the heating mode, the method further includes: Determine a first temperature average value by using the temperatures obtained by each temperature sensor before the heat pump system is started; After calibrating the second temperature sensor and before calibrating the third temperature sensor, the method further includes: Except for the port corresponding to the first temperature sensor and the port corresponding to the second temperature sensor, the temperature sensor corresponding to the port whose second temperature and fourth temperature output among the remaining ports are closest to the first temperature average value is calibrated as a fourth temperature sensor, wherein the fourth temperature sensor is a temperature sensor for obtaining the ambient temperature.

4. The foolproof detection method for a heat pump system according to claim 3, characterized in that: A temperature sensor is provided on the connecting pipeline between the second end of the first heat exchanger and the first end of the control valve, the input end of the compressor, and the water outlet end; After calibrating the third temperature sensor, the following steps are also performed: For each port, the average of the second temperature and the fourth temperature output by the port is used as the second temperature average value; except for the calibrated port, the temperature sensor corresponding to the port whose second temperature output by each remaining port is greater than or equal to the second temperature corresponding to the third temperature sensor, whose fourth temperature is less than or equal to the fourth temperature corresponding to the third temperature sensor, and whose second temperature average value is closest to the second temperature average value of the third temperature sensor is calibrated as the fifth temperature sensor; the fifth temperature sensor is the temperature sensor at the water outlet; The temperature sensor corresponding to the smaller absolute value of the difference between the first temperature and the second temperature output from the remaining ports except the calibrated port is calibrated as the sixth temperature sensor, and the temperature sensor corresponding to the last remaining port is calibrated as the seventh temperature sensor; the sixth temperature sensor is the temperature sensor on the connecting pipe between the second end of the first heat exchanger and the first end of the control valve, and the seventh temperature sensor is the temperature sensor at the input end of the compressor.

5. The foolproof detection method for a heat pump system according to claim 1, characterized in that: The controlling the opening of the control valve to decrease from the first set opening to the second set opening includes: After the heat pump system operates in the heating mode for a first set time period, the control valve is controlled to decrease from the first set opening degree to the second set opening degree at a first set rate.

6. The foolproof detection method for a heat pump system according to claim 1, characterized in that: The controlling the opening of the control valve to decrease from the third set opening to the fourth set opening includes: After the heat pump system operates in the cooling mode for a second set time period, the control valve is controlled to decrease from the third set opening to the fourth set opening at a second set rate.

7. The foolproof detection method for a heat pump system according to claim 1, characterized in that: Also includes: When the heat pump system is powered off for a preset period of time and then powered on again, the heat pump system is controlled to perform the detection of the fool-proof detection method.

8. The foolproof detection method for a heat pump system according to claim 1, characterized in that: The working mode of the heat pump system includes a normal mode and a fault mode. According to the matching between the actual correspondence between each temperature sensor and the port and the preset correspondence, the working mode of the heat pump system is controlled as follows: If the actual correspondence between at least one port and the temperature sensor does not match the preset correspondence, controlling the heat pump system to be in a fault mode; If the actual correspondence between each port and the temperature sensor matches the preset correspondence, the heat pump system is controlled to be in normal mode.

9. A foolproof detection device for a heat pump system, characterized in that: The heat pump system includes a compressor, a four-way valve, a control valve, a first heat exchanger, and a second heat exchanger; the output end of the compressor is connected to the first end of the four-way valve, the second end of the four-way valve is connected to the first end of the first heat exchanger, the second end of the first heat exchanger is connected to the first end of the control valve, the second end of the control valve is connected to the first end of the second heat exchanger, the second end of the second heat exchanger is connected to the third end of the four-way valve, and the fourth end of the four-way valve is connected to the input end of the compressor; wherein, the first end and the second end of the first heat exchanger are in communication, in a heating mode, the first end and the second end of the four-way valve are in communication, and the third end and the fourth end of the four-way valve are in communication, and in a cooling mode, the first end and the third end of the four-way valve are in communication, and the second end and the fourth end of the four-way valve are in communication; the first heat exchanger also includes a water inlet and a water outlet, and the water inlet is in communication with the water outlet; A temperature sensor is provided on the output end of the compressor, the water inlet end, and the second heat exchanger respectively; the heat pump system further comprises a mainboard, the mainboard comprises a plurality of ports, and the ports are provided correspondingly to the temperature sensors; The foolproof detection device of the heat pump system includes: a first temperature acquisition module, configured to control the heat pump system to operate in a heating mode, and, at an initial moment when the heat pump system enters the heating mode, control the opening of the control valve to be a first set opening, and acquire a first temperature of each temperature sensor of the control valve at the first set opening; a second temperature acquisition module, configured to control the opening of the control valve to decrease from the first set opening to a second set opening, and acquire a second temperature of each temperature sensor when the opening of the control valve is the second set opening; a third temperature acquisition module, configured to control the heat pump system to operate in the cooling mode, and, at an initial moment when the heat pump system enters the cooling mode, control the opening of the control valve to be a third set opening, and acquire a third temperature of each temperature sensor when the control valve is at the third set opening; a fourth temperature acquisition module, configured to control the opening of the control valve to decrease from the third set opening to a fourth set opening, and acquire a fourth temperature of each temperature sensor when the opening of the control valve is the fourth set opening; a calibration module, configured to determine an actual correspondence between each of the temperature sensors and each of the ports based on each of the first temperatures, each of the second temperatures, each of the third temperatures, and each of the fourth temperatures outputted through each of the ports; The mode control module is used to control the working mode of the heat pump system according to the matching situation between the actual corresponding relationship between each temperature sensor and the port and the preset corresponding relationship.

10. The foolproof detection device for a heat pump system according to claim 9, characterized in that: The calibration module includes: a first calibration unit, configured to calibrate a temperature sensor corresponding to a port outputting the highest temperature among the second temperatures and the fourth temperatures as a first temperature sensor; wherein the first temperature sensor is a temperature sensor at an output end of the compressor; A second calibration unit calibrates a temperature sensor corresponding to a port that outputs a fourth temperature that is only lower than the maximum temperature among all the fourth temperatures as a second temperature sensor; the maximum temperature is the highest temperature among the second temperatures and the fourth temperatures, and the second temperature sensor is the temperature sensor at the second heat exchanger; The third calibration unit is used to, for each port, use the absolute value of the difference between the first temperature and the second temperature output as the first temperature difference, the absolute value of the difference between the third temperature and the fourth temperature output as the second temperature difference, and the average value of the first temperature difference and the second temperature difference as the average temperature difference; calibrate the temperature sensor corresponding to the smallest average temperature difference corresponding to each port except the calibrated port as the third temperature sensor, wherein the third temperature sensor is the temperature sensor at the water inlet end.

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