Oil return control method and device, control system, vehicle and storage medium

Abstract

The invention provides an oil return control method and device, a control system, a vehicle and a storage medium. A compressor lubricating system comprises a scroll compressor and an oil-gas separator connected with an air outlet of the scroll compressor; an oil outlet of the oil-gas separator is connected with an oil inlet of the scroll compressor through an oil temperature regulation and control device; the method comprises the steps that the current oil temperature of the scroll compressor and the target oil temperature of the scroll compressor are obtained; the target oil temperature is the oil temperature capable of enabling the scroll compressor to be at the target operation efficiency; and when the difference between the current oil temperature and the target oil temperature exceeds a preset temperature difference threshold value, the oil temperature regulation and control device is controlled to cool refrigerant oil flowing through the oil temperature regulation and control device. According to the scheme, the risk that the volume efficiency of the scroll compressor is reduced can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, and in particular to an oil return control method, device, control system, vehicle and storage medium. Background Art

[0002] Scroll compressors are widely used in various automotive air conditioning systems due to their small size, low noise, light weight, low vibration, low energy consumption, long life, continuous and stable gas transmission, and reliable operation. Refrigeration oil can play the role of lubrication, sealing, and cooling, and is an indispensable part of the operation of scroll compressors.

[0003] However, as the scroll compressor continues to operate, the temperature of the refrigerant oil will continue to increase. In a scroll compressor, overheating of the refrigerant oil will cause changes in the suction state, increase the suction temperature, and reduce the volumetric efficiency of the scroll compressor. At the same time, overheating of the refrigerant oil will cause the viscosity to decrease, which will easily lead to a deterioration in the sealing effect between the scrolls in the scroll compressor. In severe cases, it will increase internal leakage and reduce the volumetric efficiency of the compressor. In addition, the decrease in the viscosity of the refrigerant oil will also cause the thickness of the lubricating oil film formed on the surface of the scroll to decrease, thereby affecting the lubrication of the scroll. In severe cases, it will cause friction on the scroll, increase the power consumption of the compressor, reduce the performance of the compressor, and even cause the compressor scroll to be damaged due to high temperature due to friction. In addition, after the overheated refrigerant oil enters the scroll, it will cause the cooling effect of the scroll to decrease, thereby reducing the volumetric efficiency of the scroll compressor. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide an oil return control method, device, control system, vehicle and storage medium to achieve oil return temperature control of the refrigerant oil of a scroll compressor to reduce the risk of reduced volumetric efficiency of the scroll compressor.

[0005] The embodiment of the present application provides an oil return control method for a compressor lubrication system, the compressor lubrication system comprising: a scroll compressor, an oil-gas separator connected to an air outlet of the scroll compressor, the oil outlet of the oil-gas separator being connected to an oil inlet of the scroll compressor via an oil temperature control device; the method comprising:

[0006] Obtaining the current oil temperature of the scroll compressor and the target oil temperature of the scroll compressor; the target oil temperature is the oil temperature that can make the scroll compressor operate at a target efficiency; when the difference between the current oil temperature and the target oil temperature exceeds a preset temperature difference threshold, controlling the oil temperature control device to cool the refrigerant oil flowing through the oil temperature control device.

[0007] In the above implementation process, by obtaining the current oil temperature of the scroll compressor and the target oil temperature of the scroll compressor, it is determined whether the scroll compressor has overheated refrigerant oil (if the difference between the current oil temperature and the target oil temperature exceeds the preset temperature difference threshold, it is considered that the scroll compressor has overheated refrigerant oil). When this situation occurs, the oil temperature control device is promptly controlled to cool the refrigerant oil flowing through the oil temperature control device. In this way, the overheated refrigerant oil can be cooled in time, the probability of the problems described in the relevant technology occurring can be reduced, and the risk of reduced volumetric efficiency of the scroll compressor can be reduced.

[0008] Furthermore, the compressor lubrication system also includes: a first temperature sensor, which is arranged in the scroll compressor, or at the air outlet of the scroll compressor, or at the inlet of the oil-gas separator, or at the oil outlet of the oil-gas separator; obtaining the current oil temperature of the scroll compressor includes: obtaining the temperature value detected by the first temperature sensor; the temperature value detected by the first temperature sensor represents the current oil temperature of the scroll compressor.

[0009] In the above implementation, a first temperature sensor is arranged inside the scroll compressor, or at the air outlet of the scroll compressor, or at the inlet of the oil-gas separator, or at the oil outlet of the oil-gas separator. Since the air outlet of the scroll compressor, the inlet of the oil-gas separator, and the oil outlet of the oil-gas separator are all close to the scroll compressor, the temperature values ​​detected by the first temperature sensor arranged at these positions can more accurately represent the current oil temperature of the scroll compressor. Therefore, based on the above method, the current oil temperature of the scroll compressor can be easily and accurately obtained, thereby improving the reliability of the solution.

[0010] Furthermore, obtaining the target oil temperature of the scroll compressor includes: obtaining the current operating condition of the scroll compressor; and determining the target oil temperature corresponding to the current operating condition according to the current operating condition.

[0011] In the above implementation method, by setting corresponding target oil temperatures for different working conditions, the refrigeration oil can be cooled to the oil temperature required for different working conditions, so that the scroll compressor can use refrigeration oil of the corresponding oil temperature according to the requirements of the current working conditions, thereby having better volumetric efficiency and mechanical efficiency.

[0012] Furthermore, the air outlet of the oil-gas separator is configured to be connected to the air-conditioning system so as to transmit the refrigerant output by the scroll compressor into the air-conditioning system; the working conditions of the scroll compressor include: a first working condition for cooperating with the air-conditioning system for refrigeration, and a second working condition for cooperating with the air-conditioning system for heating.

[0013] In the above implementation, a first operating condition for cooperating with the air-conditioning system for cooling and a second operating condition for cooperating with the air-conditioning system for heating are set, and the target oil temperature corresponding to the first operating condition is set lower than the target oil temperature corresponding to the second operating condition. In this way, when the above-mentioned compressor lubrication system is used in conjunction with the air-conditioning system, good coordination with different operating modes of the air-conditioning system can be achieved, so that the scroll compressor can enable the air-conditioning system to achieve better cooling or heating effects under the same power consumption.

[0014] Furthermore, the oil temperature control device is controlled to cool the refrigerant oil flowing through the oil temperature control device, including: obtaining the oil return speed of the refrigerant oil in the compressor lubrication system; controlling the refrigeration intensity of the oil temperature control device according to the difference between the oil return speed, the current oil temperature and the target oil temperature, so as to cool the refrigerant oil flowing through the oil temperature control device.

[0015] In the above implementation method, the refrigeration intensity of the oil temperature control device is controlled according to the difference between the oil return speed, the current oil temperature and the target oil temperature, so that the refrigerant oil can be cooled with an appropriate refrigeration intensity, thereby effectively reducing the refrigerant oil temperature to within the required range.

[0016] Furthermore, the air outlet of the oil-gas separator is configured to be connected to an air-conditioning system so as to transmit the refrigerant output by the scroll compressor into the air-conditioning system; the air-conditioning system includes a condenser; the oil temperature control device includes: a first pipe for the flow of refrigerant and a second control valve; the second control valve is arranged on the first pipe, one end of the first pipe is connected to the outlet side of the condenser, and the other end of the first pipe is connected to the suction port of the scroll compressor; the refrigeration intensity of the oil temperature control device is controlled according to the difference between the oil return speed and the current oil temperature and the target oil temperature, including: controlling the opening of the second control valve according to the difference between the oil return speed and the current oil temperature and the target oil temperature.

[0017] In the above implementation, the first pipeline is provided to realize the reuse of the refrigerant in the air-conditioning system, so that no additional refrigeration device is required, thereby reducing the cost. At the same time, by controlling the opening of the second control valve, the amount of refrigerant flowing into the first pipeline can be effectively managed, thereby realizing effective control of the refrigeration intensity of the oil temperature control device. The control method is simple and reliable, which is conducive to implementation in industrial production.

[0018] Furthermore, before controlling the opening of the second control valve according to the difference between the oil return speed and the current oil temperature and the target oil temperature, the method also includes: obtaining a first cooling demand for refrigerant in the air-conditioning system; determining a remaining amount of refrigerant available for use by the oil temperature control device according to the total amount of the refrigerant and the first cooling demand for the refrigerant; controlling the opening of the second control valve according to the difference between the oil return speed and the current oil temperature and the target oil temperature, including: determining a second cooling demand for refrigerant according to the difference between the oil return speed and the current oil temperature and the target oil temperature; controlling the opening of the second control valve according to the remaining amount of refrigerant when the second cooling demand is greater than or equal to the remaining amount of refrigerant; and controlling the opening of the second control valve according to the second cooling demand when the second cooling demand is less than the remaining amount of refrigerant.

[0019] Through the above implementation method, when using the refrigerant in the air-conditioning system to cool the refrigeration oil, the refrigeration needs of the air-conditioning system itself can be prioritized, thereby achieving the cooling of the refrigeration oil without affecting the user experience as much as possible, and realizing dynamic coupling with the air-conditioning system load.

[0020] Furthermore, the compressor lubrication system also includes: a second temperature sensor, which is arranged between the oil temperature control device and the oil inlet of the scroll compressor; the method also includes: obtaining the temperature value detected by the second temperature sensor; when the temperature value detected by the second temperature sensor is lower than a preset first stop temperature, controlling the oil temperature control device to stop cooling the refrigerant oil flowing through the oil temperature control device.

[0021] In the above implementation, by setting the second temperature sensor, the oil temperature input into the scroll compressor after cooling can be accurately detected. When the temperature value detected by the second temperature sensor is lower than the preset first stop temperature, it indicates that the oil temperature has been successfully lowered to the temperature required by the scroll compressor. Therefore, stopping the cooling of the refrigerant oil flowing through the oil temperature control device at this time can save energy on the one hand, and on the other hand, it can also avoid the oil temperature being too low and affecting the subsequent separation effect of the refrigerant oil and the refrigerant, thereby causing too much refrigerant oil to enter the air-conditioning system and affect the heat exchange of the air-conditioning system.

[0022] Furthermore, the method also includes: before starting the scroll compressor, obtaining the ambient temperature and the oil temperature of the refrigerant oil in the compressor lubrication system; judging whether the ambient temperature is lower than or equal to a preset ambient temperature threshold and whether the oil temperature of the refrigerant oil is lower than or equal to a preset starting oil temperature threshold; when the ambient temperature is lower than or equal to the preset ambient temperature threshold and the oil temperature of the refrigerant oil is lower than or equal to the preset starting oil temperature threshold, controlling the oil temperature control device to heat the refrigerant oil flowing through the oil temperature control device.

[0023] In a low-temperature environment, the viscosity of the refrigeration oil will increase and the fluidity will deteriorate, which will cause the refrigeration oil to be unable to effectively lubricate the various components of the scroll compressor, thereby increasing friction and wear, and may cause the scroll compressor to fail to start or run unstably. In the above implementation, when the ambient temperature is lower than or equal to the preset ambient temperature threshold and the oil temperature of the refrigeration oil is lower than or equal to the preset starting oil temperature threshold, the oil temperature control device is controlled to heat the refrigeration oil flowing through the oil temperature control device, so that the oil temperature of the scroll compressor will not be too low when starting, thereby improving the startup success rate and operating stability of the scroll compressor.

[0024] Furthermore, the method further comprises: starting the scroll compressor when the oil temperature of the refrigeration oil is higher than the preset starting oil temperature threshold.

[0025] Furthermore, the compressor lubrication system also includes a filter, which is arranged between the oil outlet of the oil-gas separator and the oil temperature control device, or between the oil temperature control device and the oil inlet of the scroll compressor.

[0026] In the above implementation, by setting a filter, it is possible to filter impurities in the refrigeration oil in the compressor lubrication system, so that the compressor lubrication system has good cleanliness.

[0027] Furthermore, the compressor lubrication system also includes a third flow detection sensor, which is arranged between the filter and the oil inlet of the scroll compressor; the method also includes: obtaining flow data detected by the third flow detection sensor; when the difference between the flow data detected by the third flow detection sensor and the preset calibration value exceeds a preset difference range, a filter replacement reminder is issued in a preset prompting manner.

[0028] Under the same oil return capacity, the detection value of the third flow detection sensor will be greatly different when the filter is not blocked and when the filter is blocked. Based on this, if the difference between the flow data detected by the third flow detection sensor and the preset calibration value exceeds the preset difference range, it means that the filter is seriously blocked. Then, according to the above implementation method, a filter replacement reminder can be given in time, thereby reducing the risk of blockage of the compressor lubrication system due to filter blockage.

[0029] Furthermore, the compressor lubrication system also includes a first pressure sensor and a second pressure sensor, the first pressure sensor is arranged at the front end of the filter, and the second pressure sensor is arranged at the rear end of the filter; the method also includes: obtaining the detection values ​​of the first pressure sensor and the second pressure sensor, and determining the pressure difference between the two ends of the filter according to the detection values ​​of the first pressure sensor and the second pressure sensor; when the pressure difference exceeds a preset pressure difference threshold, a filter replacement reminder is issued in a preset prompting manner.

[0030] Once the filter is clogged, the pressure difference at both ends of the filter will become larger, and the more serious the clog, the greater the pressure difference. In the above implementation, by setting the first pressure sensor and the second pressure sensor, and determining the pressure difference at both ends of the filter according to the detection values ​​of the first pressure sensor and the second pressure sensor, the degree of filter clogging can be accurately determined, so that when the pressure difference exceeds the preset pressure difference threshold, the filter replacement reminder is timely issued, thereby reducing the risk of compressor lubrication system clogging caused by filter clogging.

[0031] Furthermore, the compressor lubrication system also includes an oil collecting tank; the oil collecting tank is arranged between the oil outlet of the oil-gas separator and the oil temperature control device.

[0032] An embodiment of the present application also provides an oil return control device for a compressor lubrication system, the compressor lubrication system comprising: a scroll compressor, an oil-gas separator connected to the air outlet of the scroll compressor, the oil outlet of the oil-gas separator being connected to the oil inlet of the scroll compressor via an oil temperature control device; the oil return control device comprising: a second acquisition module, for acquiring the current oil temperature of the scroll compressor and the target oil temperature of the scroll compressor; the target oil temperature is an oil temperature that can make the scroll compressor at a target operating efficiency; a second control module, for controlling the oil temperature control device to cool the refrigerant oil flowing through the oil temperature control device when the difference between the current oil temperature and the target oil temperature exceeds a preset temperature difference threshold.

[0033] In the above implementation scheme, by obtaining the current oil temperature of the scroll compressor and the target oil temperature of the scroll compressor, it is determined whether the refrigerant oil in the scroll compressor is overheated. When this happens, the oil temperature control device is promptly controlled to cool the refrigerant oil flowing through the oil temperature control device. In this way, the overheated refrigerant oil can be cooled in time, the probability of the problems described in the relevant technology occurring can be reduced, and the risk of reduced volumetric efficiency of the scroll compressor can be reduced.

[0034] An embodiment of the present application also provides a control system, including: a controller and a compressor lubrication system; the compressor lubrication system includes: a scroll compressor, an oil-gas separator connected to the air outlet of the scroll compressor, the oil outlet of the oil-gas separator is connected to the oil inlet of the scroll compressor through an oil temperature control device; the controller is connected to the scroll compressor and the oil temperature control device; the controller is used for any of the above-mentioned oil return control methods for the compressor lubrication system.

[0035] A computer-readable storage medium is also provided in an embodiment of the present application, wherein the computer-readable storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement any of the above-mentioned oil return control methods for the compressor lubrication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. The following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A basic structural diagram of a compressor lubrication system provided in Example 1 of the present application;

[0038] Figure 2 A schematic flow chart of an oil return control method provided in Example 1 of the present application;

[0039] Figure 3 A schematic structural diagram of a compressor lubrication system with a second flow detection sensor provided in Embodiment 1 of the present application;

[0040] Figure 4 A schematic structural diagram of a compressor lubrication system with an oil quantity detection device provided in Example 1 of the present application;

[0041] Figure 5 A schematic diagram of a structure applied to an air conditioning system provided in Embodiment 1 of the present application;

[0042] Figure 6 A schematic diagram of the structure of a compressor lubrication system in which an oil return quantity control device includes a first control valve provided in Embodiment 1 of the present application;

[0043] Figure 7 A schematic diagram of the structure of a compressor lubrication system in which an oil return quantity control device includes an oil pump provided in Embodiment 1 of the present application;

[0044] Figure 8 A schematic diagram of the structure of a compressor lubrication system in which an oil return quantity control device provided in Embodiment 1 of the present application includes an oil pump and a first control valve;

[0045] Fig. 9 A schematic structural diagram of a compressor lubrication system including a first flow detection sensor provided in Embodiment 1 of the present application;

[0046] Fig.10 A schematic structural diagram of a compressor lubrication system provided with an oil collecting bin provided in Example 1 of the present application;

[0047] Fig.11 A schematic structural diagram of a compressor lubrication system provided with a filter provided in Embodiment 1 of the present application;

[0048] Fig.12 A schematic structural diagram of a compressor lubrication system provided with a third flow detection sensor provided in Embodiment 1 of the present application;

[0049] Fig.13 A schematic structural diagram of a compressor lubrication system provided in Embodiment 1 of the present application, including a first pressure sensor and a second pressure sensor;

[0050] Fig.14 A basic structural diagram of a compressor lubrication system provided in Example 2 of the present application;

[0051] Fig.15 A schematic flow chart of an oil return control method provided in Example 2 of the present application;

[0052] Fig.16 A schematic structural diagram of a compressor lubrication system provided with a first temperature sensor provided in Embodiment 2 of the present application;

[0053] Fig.17 A schematic diagram of a structure applied to an air conditioning system provided in Embodiment 2 of the present application;

[0054] Fig.18 A schematic diagram of the structure of a compressor lubrication system for realizing refrigeration oil cooling by refrigerant in a multiplex air-conditioning system provided in Example 2 of the present application;

[0055] Fig.19 A basic structural diagram of a compressor lubrication system provided with both an oil return quantity control device and an oil temperature control device according to the second embodiment of the present application;

[0056] Fig. 20 A system structure that can simultaneously adjust the amount of air-conditioning refrigerant and the amount of refrigerant that can be used by the oil temperature control device provided in Example 2 of the present application;

[0057] Fig.21 A schematic structural diagram of a compressor lubrication system provided with a second temperature sensor provided in Embodiment 2 of the present application;

[0058] Fig. 22 A schematic structural diagram of a compressor lubrication system provided with an oil collecting bin provided in Embodiment 2 of the present application;

[0059] Fig.23 A schematic structural diagram of a compressor lubrication system provided with a filter provided in Embodiment 2 of the present application;

[0060] Fig.24 A schematic structural diagram of a compressor lubrication system provided with a third flow detection sensor provided in Embodiment 2 of the present application;

[0061] Fig.25 A schematic structural diagram of a compressor lubrication system provided with a first pressure sensor and a second pressure sensor, provided in Embodiment 2 of the present application;

[0062] Fig.26 A schematic diagram of a specific system structure provided for an embodiment of the present application;

[0063] Fig. 27 A schematic structural diagram of a first oil return control device provided in an embodiment of the present application;

[0064] Fig.28 A schematic structural diagram of a second oil return control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0065] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0066] Embodiment 1:

[0067] When the scroll compressor is running, if the amount of refrigeration oil in the scroll compressor is too much, it is easy to cause liquid hammer damage to the scroll compressor, but if the amount of refrigeration oil is too little, it is easy to cause insufficient sealing of the scroll compressor, causing internal leakage, and in severe cases, even causing dry grinding and burning of the scroll compressor. At the same time, too much or too little refrigeration oil in the scroll compressor will also affect the operating efficiency of the scroll compressor. Therefore, in order to ensure the normal operation of the scroll compressor and improve the operating efficiency of the scroll compressor, the scroll compressor will be returned to oil in this embodiment so that the amount of refrigeration oil in the scroll compressor is within the range required by the scroll compressor.

[0068] To this end, an oil return control method for a compressor lubrication system is provided in an embodiment of the present application. Figure 1 As shown, the compressor lubrication system includes: a scroll compressor, an oil-gas separator connected to the air outlet of the scroll compressor, and the oil outlet of the oil-gas separator is connected to the oil inlet of the scroll compressor through an oil return amount control device.

[0069] In the embodiments of the present application, Figure 2 As shown, the oil return control method includes:

[0070] S201: Obtain operating parameters of the scroll compressor.

[0071] In an embodiment of the present application, the operating parameters of the scroll compressor may include the exhaust temperature, suction temperature, exhaust pressure and suction pressure of the scroll compressor. In addition, in an optional implementation of the embodiment of the present application, the operating parameters may also include the speed and / or power consumption of the scroll compressor.

[0072] Exemplarily, the operating parameters of the scroll compressor may only include the exhaust temperature, suction temperature, exhaust pressure and suction pressure of the scroll compressor; another exemplary embodiment, the operating parameters of the scroll compressor may include the exhaust temperature, suction temperature, exhaust pressure, suction pressure and speed of the scroll compressor; another exemplary embodiment, the operating parameters of the scroll compressor may include the exhaust temperature, suction temperature, exhaust pressure, suction pressure and power consumption of the scroll compressor.

[0073] The above are some optional exemplary embodiments provided in the embodiments of the present application. In addition to the above embodiments, the operating parameters of the scroll compressor obtained may also include other parameters, as long as the parameters can reflect the operating status of the scroll compressor and will be affected by the amount of refrigeration oil.

[0074] In an embodiment of the present application, a temperature sensor and a pressure sensor may be provided at the air outlet of the scroll compressor, so that the exhaust temperature of the scroll compressor may be obtained through the temperature sensor, and the exhaust pressure of the scroll compressor may be obtained through the pressure sensor.

[0075] In an embodiment of the present application, a temperature sensor and a pressure sensor may also be provided at the suction port of the scroll compressor, so that the suction temperature of the scroll compressor may be obtained through the temperature sensor, and the suction pressure of the scroll compressor may be obtained through the pressure sensor.

[0076] In an embodiment of the present application, a tachometer or a Hall sensor may be provided in the scroll compressor, so that the rotation speed of the scroll compressor can be acquired through the tachometer or the Hall sensor.

[0077] In an embodiment of the present application, a device such as a power meter or an electric meter may be provided in the scroll compressor, so that the power consumption in the scroll compressor can be obtained through the value detected by the power meter or the electric meter.

[0078] S202: Determine the current oil return demand of the scroll compressor according to the operating parameters of the scroll compressor.

[0079] In a feasible implementation of the embodiment of the present application, as Figure 3 As shown, the compressor lubrication system also includes a second flow detection sensor, which can be arranged at the oil outlet of the oil-gas separator (or can also be arranged in the oil-gas separator, or when there is an oil collection tank, it can also be arranged in the oil collection tank), so that the oil output of the scroll compressor can be determined based on the oil output of the oil-gas separator detected by the second flow detection sensor and the oil-gas separation rate of the oil-gas separator. Or, Figure 4 As shown, the compressor lubrication system also includes an oil quantity detection device, which is arranged on the scroll compressor, so that the amount of refrigeration oil in the scroll compressor can be obtained based on the oil quantity detection device. Optionally, the oil quantity detection device can be implemented by an oil quantity detection meter.

[0080] Since the operating parameters of the scroll compressor, such as the exhaust temperature, suction temperature, exhaust pressure, suction pressure, rotation speed, and power consumption, can reflect the operating state of the compressor, and thus can reflect the demand for refrigeration oil when the scroll compressor is running. Based on this, in this feasible implementation, the correspondence between different operating parameters and different refrigeration oil requirements when the scroll compressor is at the target operating efficiency can be constructed in advance through experiments. Among them, when constructing this correspondence, it is necessary to ensure that the refrigeration oil demand can ensure that the scroll compressor can be sealed.

[0081] In the embodiment of the present application, the target operating efficiency refers to the operating efficiency required by the scroll compressor. For example, the target operating efficiency may be the optimal operating efficiency of the scroll compressor.

[0082] In this feasible implementation, the detection value of the second flow detection sensor can be obtained, and the amount of refrigerant oil in the scroll compressor can be determined based on the amount of refrigerant oil stored in the scroll compressor, the detection value of the second flow detection sensor, and the oil-gas separation rate of the oil-gas separator. In addition, the corresponding relationship between the operating parameters and the refrigerant oil demand when the scroll compressor is at the target operating efficiency is obtained, and then the current refrigerant oil demand of the scroll compressor is determined from the corresponding relationship based on the operating parameters of the scroll compressor. Then, the difference between the current refrigerant oil demand of the scroll compressor and the amount of refrigerant oil in the scroll compressor is calculated to obtain the current oil return demand of the scroll compressor.

[0083] Wherein, the amount of refrigeration oil stored in the scroll compressor refers to the amount of refrigeration oil in the scroll compressor recorded when the amount of refrigeration oil in the current scroll compressor is calculated. It can also be understood as the amount of refrigeration oil in the scroll compressor before the current amount of refrigeration oil in the scroll compressor is calculated. The method for determining the amount of refrigeration oil in the scroll compressor according to the amount of refrigeration oil stored in the scroll compressor, the detection value of the second flow detection sensor and the oil-gas separation rate of the oil-gas separator can be: the detection value of the second flow detection sensor is divided by the oil-gas separation rate of the oil-gas separator to obtain the amount of refrigeration oil lost in the scroll compressor, and the amount of refrigeration oil in the scroll compressor is obtained by subtracting the amount of refrigeration oil lost in the scroll compressor from the amount of refrigeration oil stored in the scroll compressor.

[0084] Taking into account that after the oil return control is carried out, part of the refrigerant oil will flow back into the scroll compressor, thereby replenishing the refrigerant oil in the scroll compressor, when performing the above calculation, the amount of refrigerant oil flowing back into the scroll compressor can also be counted in real time, and then the amount of refrigerant oil stored in the scroll compressor plus the amount of refrigerant oil flowing back into the scroll compressor is added to the amount of refrigerant oil lost in the scroll compressor when calculating, and the amount of refrigerant oil in the scroll compressor is subtracted.

[0085] In this feasible implementation, the amount of refrigeration oil in the scroll compressor detected by the oil amount detection device can also be obtained, and the corresponding relationship between the operating parameters and the refrigeration oil demand when the scroll compressor is at the target operating efficiency can be obtained, and then the current refrigeration oil demand of the scroll compressor can be determined from the corresponding relationship according to the operating parameters of the scroll compressor. At this time, the difference between the current refrigeration oil demand of the scroll compressor and the refrigeration oil amount in the scroll compressor detected by the oil amount detection device can be directly calculated to obtain the current oil return demand of the scroll compressor.

[0086] Based on the above method, the current oil return demand of the scroll compressor can be obtained more accurately, so that the working efficiency of the scroll compressor after returning oil according to the oil return demand can be as close to the target operating efficiency as possible, thereby improving the working efficiency of the scroll compressor.

[0087] In another feasible implementation, the detection value of the second flow detection sensor may be directly obtained as the oil discharge amount of the scroll compressor, and then the current refrigeration oil demand of the scroll compressor may be estimated based on the oil discharge amount of the scroll compressor.

[0088] In some optional embodiments, considering that the compressor operates under different working conditions, the corresponding relationship between the operating parameters and the refrigeration oil demand may be different when it operates under the target operating efficiency. Therefore, in this optional embodiment, the corresponding relationship between the operating parameters and the refrigeration oil demand when the scroll compressor operates under different working conditions with the target operating efficiency can be obtained in advance by experiment. Then in the process of determining the current return oil demand of the scroll compressor, the current working condition of the scroll compressor can be obtained first, and then the target corresponding relationship corresponding to the current working condition can be obtained, and then the current refrigeration oil demand of the scroll compressor can be determined from the target corresponding relationship according to the operating parameters of the scroll compressor, and then the current refrigeration oil demand of the scroll compressor can be used to determine the current return oil demand of the scroll compressor.

[0089] The target corresponding relationship refers to the corresponding relationship between the operating parameters and the refrigeration oil demand when the scroll compressor is at the target operating efficiency under the current working conditions.

[0090] In this way, the working conditions of the scroll compressor are taken into consideration, so that the amount of refrigerant oil in the scroll compressor after the final oil return meets the requirements of the current working conditions of the scroll compressor, thereby making the working efficiency of the scroll compressor closer to the optimal efficiency point of the current working conditions, thereby improving the working efficiency of the scroll compressor.

[0091] In another feasible implementation of the embodiment of the present application, the exhaust temperature, suction temperature, exhaust pressure and suction pressure of the scroll compressor of the scroll compressor can reflect the operating state of the compressor, and then can reflect the demand of the scroll compressor for refrigeration oil. However, the scroll compressor is basically the same in terms of the loss of refrigeration oil under the same operating conditions. Therefore, to a certain extent, the exhaust temperature, suction temperature, exhaust pressure and suction pressure of the scroll compressor of the scroll compressor can reflect the operating state of the compressor and can also reflect the return oil demand of the scroll compressor for refrigeration oil. Therefore, in this feasible implementation, the second flow detection sensor or oil quantity detection device may not be set, but the corresponding relationship between different operating parameters and different refrigeration oil demands when the scroll compressor is at the target operating efficiency is constructed in advance through experiments. Among them, the corresponding relationship needs to ensure that the refrigeration oil demand can ensure that the cooling, lubrication and sealing functions of the scroll compressor are normal when constructed.

[0092] In this way, when the current oil return demand of the scroll compressor is determined from the corresponding relationship based on the operating parameters of the scroll compressor, the corresponding relationship between the operating parameters and the oil return demand when the scroll compressor is at the target operating efficiency can be obtained, and then the current oil return demand of the scroll compressor can be determined from the corresponding relationship based on the operating parameters of the scroll compressor.

[0093] The above feasible implementation does not need to set up a flow detection device for detecting the amount of refrigeration oil in the scroll compressor, so it has a lower implementation cost. In addition, since the corresponding relationship between the operating parameters and the oil return demand when the scroll compressor is at the target operating efficiency is obtained, after the oil return amount is controlled according to the oil return demand determined by the corresponding relationship, the scroll compressor can also be operated near the target operating efficiency, thereby improving the working efficiency of the scroll compressor.

[0094] Similarly, considering that the compressor operates under different working conditions, when it operates under the target operating efficiency, the corresponding relationship between the operating parameters and the oil return demand may be different. Therefore, in this optional embodiment, the corresponding relationship between the operating parameters and the oil return demand when the scroll compressor operates under different working conditions with the target operating efficiency can be obtained in advance by experiment. Then in the process of determining the current oil return demand of the scroll compressor, the current working condition of the scroll compressor can be obtained first, and then the target corresponding relationship corresponding to the current working condition is obtained, and then the current oil return demand of the scroll compressor is determined from the target corresponding relationship according to the operating parameters of the scroll compressor. Among them, the target corresponding relationship in this paragraph refers to: under the current working condition, when the scroll compressor is at the target operating efficiency, the corresponding relationship between the operating parameters and the oil return demand. In this way, the working condition of the scroll compressor is taken into account, so that the amount of refrigeration oil in the scroll compressor after the oil return is finally carried out meets the requirements of the current working condition of the scroll compressor, so that the working efficiency of the scroll compressor is closer to the optimal efficiency point of the current working condition, thereby improving the working efficiency of the scroll compressor.

[0095] In the embodiment of the present application, the scroll compressor can be used in an air-conditioning system to provide a power source for the refrigerant circulation of the air-conditioning system. Figure 5 As shown, the air outlet of the oil-gas separator in the compressor lubrication system of the embodiment of the present application can be configured to be connected to the air conditioning system to transfer the refrigerant output by the scroll compressor into the air conditioning system. At the same time, the refrigerant outlet end of the pipeline of the air conditioning system can be connected to the air intake port of the scroll compressor to realize the circulation of the refrigerant.

[0096] In an embodiment of the present application, the working state of the scroll compressor is related to the state of the air conditioning system with which it cooperates. Exemplarily, the air conditioning system needs to cool or heat, but the gap between the ambient temperature and the set temperature of the air conditioning system is large, then the demand for refrigerant in the air conditioning system is relatively large, and the scroll compressor needs to work under a larger load; if the gap between the ambient temperature and the set temperature of the air conditioning system is small, then the demand for refrigerant in the air conditioning system is small, and the scroll compressor needs to work under a smaller load. Thus, in an embodiment of the present application, the working condition of the scroll compressor may include: a third working condition for realizing the aforementioned larger load and a fourth working condition for realizing the aforementioned smaller load. Among them, a load threshold can be set, and the load exceeding the load threshold is called a larger load, and the load not exceeding the load threshold is called a smaller load. In an embodiment of the present application, when constructing the corresponding relationship between the operating parameters and the return oil demand, the third working condition is compared with the fourth working condition, and under the same operating parameters, the corresponding return oil demand of the third working condition is higher than the corresponding return oil demand of the fourth working condition. Similarly, when constructing the correspondence between operating parameters and refrigeration oil demand, compared with the fourth operating condition, under the same operating parameters, the corresponding refrigeration oil demand of the third operating condition is higher than the corresponding refrigeration oil demand of the fourth operating condition.

[0097] In an embodiment of the present application, the working state of the scroll compressor is also related to the temperature of the scroll compressor itself. When the temperature of the scroll compressor exceeds the set limit, the scroll compressor will be in a dangerous state, and cooling treatment is required at this time. To this end, in an embodiment of the present application, the working condition of the scroll compressor may also include: ultra-high temperature operating conditions. Exemplarily, an operating temperature critical value may be pre-set, and when the temperature inside the scroll compressor or the exhaust temperature of the scroll compressor is higher than the operating temperature critical value, it is determined that the scroll compressor is in an ultra-high temperature operating condition.

[0098] In the embodiment of the present application, when constructing the correspondence between the operating parameters and the refrigeration oil demand, under the same operating parameters, the refrigeration oil demand corresponding to the ultra-high temperature operating condition is higher than the refrigeration oil demand corresponding to the third condition. When constructing the correspondence between the operating parameters and the return oil demand, under the same operating parameters, the return oil demand corresponding to the ultra-high temperature operating condition is higher than the return oil demand corresponding to the third condition.

[0099] In an embodiment of the present application, when obtaining the current operating condition of the scroll compressor, it is possible to first determine whether the scroll compressor is in an ultra-high temperature operating condition. If the scroll compressor is not in an ultra-high temperature operating condition, it is then possible to determine whether the scroll compressor is in the third operating condition or the fourth operating condition.

[0100] S203: Controlling the oil return capacity of the oil return quantity control device according to the oil return demand and the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor.

[0101] In the embodiments of the present application, Figure 6 As shown, the oil return amount control device may include a first control valve. At this time, step S203 may include: controlling the opening of the first control valve according to the oil return demand and the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor.

[0102] In an embodiment of the present application, the oil return time can be pre-set, so that the oil return speed can be determined based on the quotient of the oil return demand and the pre-set oil return time, and then the opening of the first control valve can be controlled based on the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor and the oil return speed.

[0103] The pressure difference between the exhaust pressure and the suction pressure of the scroll compressor can provide power for the flow of the refrigeration oil in the compressor lubrication system. The greater the pressure difference, the greater the power. The greater the opening of the first control valve, the greater the oil return speed under the same pressure difference. Therefore, the corresponding relationship between the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor, the oil return speed and the opening of the first control valve can be pre-constructed, and then the opening of the first control valve can be determined and controlled based on the corresponding relationship.

[0104] In the embodiments of the present application, Figure 7 As shown, the oil return amount control device may include an oil pump. At this time, step S203 may include: controlling the speed of the oil pump according to the oil return demand and the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor.

[0105] In the embodiment of the present application, the oil return time can be preset, so that the target oil return speed can be determined according to the quotient of the oil return demand and the preset oil return time, and then the speed of the oil pump can be controlled based on the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor and the target oil return speed. Among them, a basic oil return speed can be determined based on the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor and the diameter of the pipeline, then the missing oil return speed can be determined based on the target oil return speed and the basic oil return speed, and then the oil pump speed is controlled to make up for the missing oil return speed, so that the final oil return speed can reach the target oil return speed, so as to input the refrigerant oil of the aforementioned oil return demand into the scroll compressor within the preset oil return time.

[0106] In order to achieve accurate oil return control, in the embodiment of the present application, the oil return speed corresponding to the different pressure differences between the exhaust pressure and the suction pressure of the scroll compressor in the compressor lubrication system can be determined in advance through experiments, simulations, etc., and the corresponding relationship between the pressure difference and the oil return speed can be recorded; and the oil return speed that can be generated at different speeds of the oil pump can be determined in advance through experiments, simulations, etc., and the corresponding relationship between the oil pump speed and the oil return speed is also recorded. When performing oil return control, the basic oil return speed can be determined first based on the corresponding relationship between the pressure difference and the oil return speed, and then the required oil pump speed can be determined based on the missing oil return speed and the corresponding relationship between the oil pump speed and the oil return speed, and then the oil pump can be controlled to operate at the oil pump speed.

[0107] In the embodiments of the present application, Figure 8 As shown, the oil return amount control device can include an oil pump and a first control valve at the same time. At this time, in an optional embodiment, the oil return control can be preferentially performed based on the first control valve, and when the required oil return speed is not met even at the maximum opening of the first control valve, the oil pump is used for control.

[0108] Exemplarily, the target oil return speed can be determined based on the oil return demand and the preset oil return time; if the first control valve can reach the target oil return speed at the maximum opening under the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor, the opening of the first control valve is controlled according to the target oil return speed and the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor; if the first control valve cannot reach the target oil return speed at the maximum opening under the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor, the first control valve is controlled to be at the maximum opening, and the speed of the oil pump is controlled according to the difference between the target oil return speed and the maximum opening oil return speed. Among them, the maximum opening oil return speed is: the oil return speed at the maximum opening when the oil pump is not running and the first control valve is at the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor.

[0109] In this optional embodiment, the oil return speed corresponding to the different pressure differences between the exhaust pressure and the suction pressure of the scroll compressor and the different openings of the first control valve in the compressor lubrication system can be determined in advance by means of experiments, simulations, etc., and the corresponding relationship between the pressure difference, the opening and the oil return speed can be recorded; and the oil return speed that can be generated at different speeds of the oil pump can be determined in advance by means of experiments, simulations, etc., and the corresponding relationship between the oil pump speed and the oil return speed is also recorded. When performing oil return control, it can be determined based on the corresponding relationship between the pressure difference, the opening and the oil return speed whether the first control valve can reach the target oil return speed at the maximum opening under the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor. If it can be reached, the opening of the first control valve is determined directly based on the target oil return speed and the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor from the corresponding relationship between the pressure difference, the opening and the oil return speed, and the first control valve is controlled to open the opening. If the first control valve cannot reach the target oil return speed at the maximum opening, the first control valve is controlled to be at the maximum opening, and the difference between the target oil return speed and the maximum opening oil return speed is calculated to obtain a first differential speed, and the oil pump speed is determined from the corresponding relationship between the oil pump speed and the oil return speed according to the first differential speed, and the oil pump is controlled to operate according to the oil pump speed. The maximum opening oil return speed can be determined according to the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor and the maximum opening of the first control valve from the corresponding relationship between the pressure difference, the opening and the oil return speed.

[0110] In this way, the first control valve is preferentially used for oil return control. When the first control valve still cannot meet the oil return demand at the maximum opening, the oil pump is further used for oil return control. In this way, the oil return demand of the scroll compressor can be met while minimizing the pumping volume of the oil pump, thereby reducing excessive energy consumption of the compressor due to oil pumping.

[0111] Understandably, Figure 8 The scheme shown can also be implemented in other ways when performing oil return control. For example, the oil pump speed can be set to work at the optimal efficiency point of the oil pump, and then the opening of the first control valve is determined according to the oil pump speed, the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor, and the target oil return speed, and then the first control valve is controlled to open the opening. If the required opening of the first control valve exceeds the maximum opening of the first control valve, the first control valve is controlled to open the maximum opening, and the speed of the oil pump is increased so that the oil return speed can reach the target oil return speed.

[0112] For example, the corresponding relationship between different pressure differences between the exhaust pressure and the suction pressure of the scroll compressor, different first control valve openings, and the oil return speed can be determined in advance through experiments or simulations when the oil pump is operating at the optimal efficiency point. Then, according to the target oil return speed and the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor, the opening of the first control valve is determined from the corresponding relationship, and then the oil pump is controlled to operate at the speed when operating at the optimal efficiency point, and the first control valve is controlled to open the determined opening.

[0113] In addition, the corresponding relationship between different oil pump speeds and oil return speeds at the maximum opening of the first control valve, and the corresponding relationship between different pressure differences and oil return speeds at the maximum opening of the first control valve can also be determined in advance through experiments or simulations. When the target oil return speed exceeds the maximum oil return speed in the corresponding relationship between the different pressure differences between the exhaust pressure and the suction pressure of the scroll compressor, the different first control valve openings and the oil return speed when the oil pump is working at the optimal efficiency point, it means that the required opening of the first control valve exceeds the maximum opening of the first control valve. At this time, according to the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor, the basic oil return speed that can be brought by the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor can be determined from the corresponding relationship between the pressure difference and the oil return speed. Then, the difference between the target oil return speed and the basic oil return speed is calculated to obtain a second difference speed, and the oil pump speed is determined from the corresponding relationship between the oil pump speed and the oil return speed according to the second difference speed, and then the oil pump is controlled to operate at the oil pump speed.

[0114] In the embodiment of the present application, the oil return time can be set according to the oil return urgency of the scroll compressor, for example, it can be set to 1 second. The higher the oil return urgency of the scroll compressor, the shorter the oil return time can be set.

[0115] In the embodiment of the present application, the first control valve can be implemented by a controlled valve such as a controlled throttle valve, an electronic expansion valve, etc., but this is not a limitation.

[0116] In the embodiments of the present application, Fig. 9 As shown, the compressor lubrication system may further include a first flow detection sensor, wherein the first flow detection sensor is arranged between the oil outlet of the oil-gas separator and the oil return quantity control device, or between the oil return quantity control device and the oil inlet of the scroll compressor.

[0117] At this time, the flow data detected by the first flow detection sensor can be obtained, and the actual oil return volume of the scroll compressor can be determined based on the flow data. Then, when the actual oil return volume reaches the current oil return demand of the scroll compressor, the oil return volume control device is closed, or the oil return capacity of the oil return volume control device is adjusted to match the oil output per unit time of the scroll compressor oil outlet. In this way, when the actual oil return volume reaches the current oil return demand of the scroll compressor, the oil return volume control device is closed, or the oil return capacity of the oil return volume control device is adjusted to match the oil output per unit time of the scroll compressor oil outlet, which can reduce the risk of excessive refrigerant oil in the scroll compressor and reduce the operating load of the scroll compressor.

[0118] Optionally, the oil return capacity of the oil return quantity control device can be adjusted to be the same as the oil output per unit time of the scroll compressor oil outlet, so as to keep the amount of refrigerant oil in the scroll compressor continuously at a suitable state, thereby improving the operating efficiency of the scroll compressor.

[0119] In the embodiments of the present application, Fig.10 As shown, the compressor lubrication system may also include an oil collecting tank. The oil collecting tank may be arranged between the oil outlet of the oil-gas separator and the oil return quantity control device. At this time, the first flow detection sensor may be arranged after the oil collecting tank, so that the detection value of the first flow detection sensor may accurately characterize the actual oil return quantity of the refrigeration oil, so that when the actual oil return quantity reaches the current oil return demand of the scroll compressor, the oil return quantity control device is closed, or the oil return capacity of the oil return quantity control device is adjusted to a degree that matches the oil output per unit time of the oil outlet of the scroll compressor, which can reduce the risk of excessive refrigeration oil in the scroll compressor and reduce the operating load of the scroll compressor.

[0120] In the embodiments of the present application, Fig.11 As shown, the compressor lubrication system may also include a filter. The filter may be disposed between the oil outlet of the oil-gas separator and the oil return quantity control device, or between the oil return quantity control device and the oil inlet of the scroll compressor. Thus, by disposing the filter, impurities in the refrigeration oil in the compressor lubrication system may be filtered, so that the compressor lubrication system has good cleanliness.

[0121] In the embodiments of the present application, Fig.12 As shown, the compressor lubrication system may further include a third flow detection sensor, wherein the third flow detection sensor may be arranged between the outlet of the filter and the oil inlet of the scroll compressor.

[0122] At this time, the flow data detected by the third flow detection sensor can be obtained, and when the difference between the flow data detected by the third flow detection sensor and the preset calibration value exceeds the preset difference range, the filter replacement reminder is given in a preset prompting manner.

[0123] Under the same oil return capacity, the detection value of the third flow detection sensor will be greatly different when the filter is not blocked and when the filter is blocked. Based on this, if the difference between the flow data detected by the third flow detection sensor and the preset calibration value exceeds the preset difference range, it means that the filter is seriously blocked. Then, according to the implementation method described in the previous paragraph, the filter replacement reminder can be made in time, thereby reducing the risk of blockage of the compressor lubrication system due to filter blockage.

[0124] In the embodiments of the present application, Fig.13 As shown, the compressor lubrication system may further include a first pressure sensor and a second pressure sensor, the first pressure sensor being disposed at the front end of the filter, and the second pressure sensor being disposed at the rear end of the filter.

[0125] At this time, the detection values ​​of the first pressure sensor and the second pressure sensor can be obtained, and the pressure difference at both ends of the filter can be determined according to the detection values ​​of the first pressure sensor and the second pressure sensor. When the pressure difference exceeds the preset pressure difference threshold, the filter replacement reminder is given according to the preset prompt method.

[0126] Considering that once the filter is clogged, the pressure difference at both ends of the filter will become larger, and the more serious the clog, the greater the pressure difference. Therefore, by setting the first pressure sensor and the second pressure sensor, and determining the pressure difference at both ends of the filter according to the detection values ​​of the first pressure sensor and the second pressure sensor, the degree of filter clogging can be accurately determined, so that when the pressure difference exceeds the preset pressure difference threshold, the filter replacement reminder is timely issued, thereby reducing the risk of compressor lubrication system clogging caused by filter clogging.

[0127] In an embodiment of the present application, the preset reminder method for filter replacement reminder may include but is not limited to at least one of the following: reminder through a preset alarm light, reminder through a preset speaker; by displaying the alarm information on a preset display, such as displaying the alarm information on a vehicle-mounted display screen; reminder by sending an alarm message to a preset terminal device, for example, the user contact information can be pre-set, and the reminder is achieved by sending an alarm message to a terminal with the contact information.

[0128] Based on the oil return control method of the compressor lubrication system provided by the embodiment of the present application, the current oil return demand of the scroll compressor is determined according to the exhaust temperature, suction temperature, exhaust pressure and suction pressure of the scroll compressor, and then the oil return capacity of the oil return control device is controlled according to the oil return demand and the pressure difference between the exhaust pressure and suction pressure of the scroll compressor. In this way, since the exhaust temperature, suction temperature, exhaust pressure and suction pressure of the scroll compressor of the scroll compressor can reflect the operating state of the compressor, and then can reflect the demand of the scroll compressor for refrigeration oil, the dynamic oil return control based on the current oil return demand of the scroll compressor can be realized by the above method, thereby reducing the risk of too much or too little refrigeration oil in the scroll compressor. At the same time, through dynamic oil return control, the refrigeration oil amount of the scroll compressor can be constantly within the oil amount range required, thereby also improving the operating efficiency of the scroll compressor.

[0129] Embodiment 2:

[0130] In a scroll compressor, overheating of the refrigeration oil can cause the suction state to change, increase the suction temperature, and reduce the volumetric efficiency of the scroll compressor. At the same time, overheating of the refrigeration oil can cause the viscosity to decrease, which can easily cause the sealing effect between the scrolls in the scroll compressor to deteriorate, and in severe cases, it can increase the internal leakage and reduce the volumetric efficiency of the compressor. In addition, the viscosity of the refrigeration oil decreases, which can also reduce the thickness of the lubricating oil film formed on the surface of the scroll, thereby affecting the lubrication of the scroll, and in severe cases, it can cause friction of the scroll, increase the power consumption of the compressor, reduce the performance of the compressor, and even cause the compressor scroll to be damaged by high temperature due to friction. In addition, after the overheated refrigeration oil enters the scroll, it can cause the cooling effect of the scroll to decrease, thereby reducing the volumetric efficiency of the scroll compressor. Therefore, in order to ensure the normal operation of the scroll compressor, reduce the risk of damage to the scroll compressor, and improve the volumetric efficiency of the scroll compressor, the scroll compressor will be returned to the oil temperature control in this embodiment so that the refrigeration oil temperature in the scroll compressor is within the range required by the scroll compressor.

[0131] To this end, an oil return control method for a compressor lubrication system is also provided in an embodiment of the present application. Fig.14 As shown, the compressor lubrication system includes: a scroll compressor, an oil-gas separator connected to the air outlet of the scroll compressor, and the oil outlet of the oil-gas separator is connected to the oil inlet of the scroll compressor through an oil temperature control device.

[0132] In the embodiments of the present application, Fig.15 As shown, the oil return control method includes:

[0133] S1501: Acquire the current oil temperature of the scroll compressor and the target oil temperature of the scroll compressor.

[0134] In the embodiment of the present application, the target oil temperature is the oil temperature that can make the scroll compressor operate at the target efficiency, which can be determined in advance through experiments.

[0135] In a feasible implementation of the embodiment of the present application, the compressor lubrication system may further include a first temperature sensor, which may be disposed in the scroll compressor, or at the air outlet of the scroll compressor, or at the inlet of the oil-gas separator, or at the oil outlet of the oil-gas separator, for example. Fig.16 As shown, Fig.16 The embodiment shows that the first temperature sensor is arranged at the oil outlet of the oil-gas separator. At this time, the current oil temperature of the scroll compressor can be obtained by acquiring the temperature value detected by the first temperature sensor.

[0136] Among them, if the first temperature sensor is set in the scroll compressor, the first temperature sensor will accurately represent the current oil temperature in the scroll compressor. If the first temperature sensor is set at the air outlet of the scroll compressor, or the inlet of the oil-gas separator, or the oil outlet of the oil-gas separator, then because the air outlet of the scroll compressor, the inlet of the oil-gas separator, and the oil outlet of the oil-gas separator are all close to the scroll compressor, the temperature value detected by the first temperature sensor set at these positions can more accurately represent the current oil temperature of the scroll compressor. Therefore, based on the above feasible implementation method, the current oil temperature of the scroll compressor can be easily and more accurately obtained, improving the reliability of the solution.

[0137] In some optional implementations of the embodiments of the present application, considering that the optimal operating parameters of the scroll compressor may be different under different working conditions, the target operating efficiency may be different, and the target oil temperature required may also be different. Therefore, in this optional implementation, the target oil temperatures corresponding to different working conditions can be pre-set, so that when obtaining the target oil temperature of the scroll compressor, the current working condition of the scroll compressor can be obtained first, and then the target oil temperature corresponding to the current working condition can be determined according to the current working condition. In this way, when cooling the refrigeration oil, the refrigeration oil can be cooled to the oil temperature required for different working conditions, so that the scroll compressor can use the refrigeration oil of the corresponding oil temperature according to the needs of the current working condition, with better volumetric efficiency and mechanical efficiency.

[0138] Among them, the target oil temperatures corresponding to different working conditions can be determined through experiments or simulations.

[0139] In the embodiment of the present application, the scroll compressor can be used in an air-conditioning system to provide a power source for the refrigerant circulation of the air-conditioning system. Fig.17As shown, the air outlet of the oil-gas separator in the compressor lubrication system of the embodiment of the present application can be configured to be connected to the air conditioning system to transfer the refrigerant output by the scroll compressor into the air conditioning system. At the same time, the refrigerant outlet end of the pipeline of the air conditioning system can be connected to the air intake port of the scroll compressor to realize the circulation of the refrigerant.

[0140] In an embodiment of the present application, the working state of the scroll compressor is related to the state of the air-conditioning system with which it cooperates. Exemplarily, if the air-conditioning system needs refrigeration, then the temperature demand for the refrigerant in the air-conditioning system hopes that the refrigerant temperature can be lower, and accordingly, for the scroll compressor, it is hoped that the temperature of the refrigeration oil can be lower; if the air-conditioning system needs heating, then the temperature demand for the refrigerant in the air-conditioning system hopes that the refrigerant temperature can be higher, and accordingly, for the scroll compressor, it is hoped that the temperature of the refrigeration oil can be higher. Therefore, in an embodiment of the present application, the working condition of the scroll compressor may include: a first working condition for cooperating with the air-conditioning system for refrigeration, and a second working condition for cooperating with the air-conditioning system for heating. In this way, when the above-mentioned compressor lubrication system is used in conjunction with the air-conditioning system, good coordination with different operating modes of the air-conditioning system can be achieved, so that the scroll compressor can enable the air-conditioning system to achieve better cooling or heating effects at the same power consumption.

[0141] In an embodiment of the present application, as described above, the working state of the scroll compressor is also related to the temperature of the scroll compressor itself. When the temperature of the scroll compressor exceeds the set limit, the scroll compressor will be in a dangerous state, and cooling treatment is required at this time. For this reason, in this embodiment, the working condition of the scroll compressor can also include the ultra-high temperature operating condition described in embodiment one. The target oil temperature corresponding to the ultra-high temperature operating condition can be configured as a safe oil temperature that allows the scroll compressor to maintain safe operation, so that when it is determined that the scroll compressor is in an ultra-high temperature operating condition, the refrigerant oil is cooled by starting the oil temperature control device to reduce the risk of damage to the scroll compressor.

[0142] In an embodiment of the present application, when obtaining the current operating condition of the scroll compressor, it is possible to first determine whether the scroll compressor is in an ultra-high temperature operating condition. If the scroll compressor is not in an ultra-high temperature operating condition, it is then possible to determine whether the scroll compressor is in the first operating condition or the second operating condition.

[0143] S1502: When the difference between the current oil temperature and the target oil temperature exceeds a preset temperature difference threshold, the oil temperature control device is controlled to cool the refrigeration oil flowing through the oil temperature control device.

[0144] In the embodiment of the present application, the preset temperature difference threshold can be determined according to the actual acceptable volumetric efficiency deviation degree. Optionally, the preset temperature difference threshold can be set to 0. At this time, once the current oil temperature is greater than the target oil temperature, the oil temperature control device will be used to cool the refrigeration oil flowing through the oil temperature control device. Optionally, the preset temperature difference threshold can be set to a non-zero value, for example, set to 5 degrees, so that when the difference between the current oil temperature and the target oil temperature exceeds 5 degrees, the oil temperature control device is activated to cool the refrigeration oil flowing through the oil temperature control device.

[0145] In an embodiment of the present application, the oil temperature control device may include an independent refrigerator, so that the temperature of the refrigeration oil flowing through the oil temperature control device can be controlled by controlling the start and stop of the refrigerator.

[0146] In the embodiment of the present application, the oil temperature control device can reuse the refrigerant in the air conditioning system to achieve temperature reduction control. Fig.18 As shown, the air conditioning system includes a condenser, and the oil temperature control device includes: a first pipe for the flow of refrigerant and a second control valve. The second control valve is arranged on the first pipe, one end of the first pipe is connected to the outlet side of the condenser, and the other end of the first pipe is connected to the air intake port of the scroll compressor. In this way, the temperature reduction control of the refrigeration oil flowing through the oil temperature control device can be achieved by controlling the opening and closing of the second control valve.

[0147] In addition, when the refrigeration intensity of the refrigerator can be adjusted, the cooling intensity of the refrigerator can be controlled to achieve different cooling intensity controls on the refrigeration oil flowing through the oil temperature control device. Similarly, when the second control valve can be controlled to open to different openings, the opening degree of the second control valve can be controlled to achieve different cooling intensity controls on the refrigeration oil flowing through the oil temperature control device.

[0148] Illustratively, in an embodiment of the present application, the oil return speed of the refrigerant oil in the compressor lubrication system can be obtained, and then the refrigeration intensity of the oil temperature control device can be controlled according to the difference between the oil return speed, the current oil temperature and the target oil temperature, so as to cool the refrigerant oil flowing through the oil temperature control device.

[0149] Then, when the oil temperature control device includes an independent refrigerator and the refrigerator can adjust the cooling intensity, the above operation is: the refrigerator can be controlled to adjust to the corresponding cooling intensity according to the difference between the oil return speed and the current oil temperature and the target oil temperature.

[0150] When the oil temperature control device includes a first pipeline and a second control valve, and the second control valve can be controlled to open different openings, the above operation is: the opening of the second control valve can be controlled according to the difference between the oil return speed, the current oil temperature and the target oil temperature.

[0151] In the embodiment of the present application, the refrigeration strength of the oil temperature control device corresponding to different oil return speeds and different temperature drop differences (including the refrigeration strength of the refrigerator or the opening of the second control valve) can be preset, so as to realize the control of the refrigeration strength of the oil temperature control device based on the corresponding relationship. The temperature drop difference refers to the difference between the current oil temperature and the target oil temperature, which can be obtained by calculating the difference between the current oil temperature and the target oil temperature.

[0152] Optionally, in the embodiment of the present application, the second control valve can be implemented by a controlled valve such as a controlled throttle valve, an electronic expansion valve, etc., but this is not a limitation.

[0153] Optional, such as Fig.18 As shown, the air conditioning system may include a condenser, a throttling device (such as but not limited to an expansion valve or a control valve, etc.) and an evaporator to achieve the normal function of the air conditioning system. The throttling device is arranged between the condenser and the evaporator, and it can be arranged before the connection point between the main pipeline of the air conditioning system and the first pipeline, for example Fig.18 As shown, it can also be arranged after the access point between the main pipeline and the first pipeline of the air conditioning system, for example Fig. 20 As shown, Fig. 20 The third control valve in the flowmeter is a throttling device.

[0154] In an embodiment of the present application, when the scroll compressor is in an ultra-high temperature operating condition, the refrigeration intensity of the oil temperature control device can be controlled to a maximum intensity, for example, the second control valve is controlled to open to a maximum degree, thereby cooling the scroll compressor to the greatest extent and reducing the risk of damage to the scroll compressor.

[0155] Optionally, in the case where the compressor lubrication system is not provided with an oil return quantity control device, the oil return speed of the refrigerant oil in the compressor lubrication system can be determined based on the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor and the inner diameter of the pipe in the compressor lubrication system. In the case where the compressor lubrication system is provided with an oil return quantity control device, the oil return speed of the refrigerant oil in the compressor lubrication system can be determined based on the oil return demand and the preset oil return time, or based on the pressure difference between the exhaust pressure and the suction pressure of the compressor lubrication system, the oil return capacity (the opening of the first control valve and / or the speed of the oil pump) controlled by the oil return quantity control device, and the various corresponding relationships recorded in Example 1, the oil return speed is determined from each corresponding relationship.

[0156] Optionally, when a return oil quantity control device is provided in the compressor lubrication system, the oil temperature control device can be provided between the oil outlet of the oil-gas separator and the return oil quantity control device, or between the return oil quantity control device and the oil inlet of the scroll compressor, for example Fig.19 shown.

[0157] When the oil temperature control device reuses the refrigerant in the air-conditioning system to achieve temperature control, if the air-conditioning system is in cooling mode, the air-conditioning system itself will also have a demand for refrigerant for cooling. At this time, the total amount of refrigerant may not be enough to meet both the demand for refrigerant by the air-conditioning system and the demand for refrigerant by the oil temperature control device.

[0158] In this case, in a feasible implementation of the embodiment of the present application, the first cooling demand for refrigerant in the air-conditioning system can be obtained first, and then the remaining amount of refrigerant available for the oil temperature control device can be determined based on the total amount of refrigerant and the first cooling demand of the refrigerant, and then the second cooling demand of the refrigerant can be determined based on the return oil speed, the difference between the current oil temperature and the target oil temperature. When the second cooling demand is greater than or equal to the remaining amount of refrigerant, the opening of the second control valve is controlled according to the remaining amount of refrigerant; when the second cooling demand is less than the remaining amount of refrigerant, the opening of the second control valve is controlled according to the second cooling demand. In this way, when the refrigerant in the air-conditioning system is used to cool the refrigeration oil, the refrigeration demand of the air-conditioning system itself can be given priority, thereby achieving the cooling of the refrigeration oil without affecting the user experience as much as possible, and achieving dynamic coupling with the load of the air-conditioning system.

[0159] The remaining amount of refrigerant is equal to the total amount of refrigerant minus the first cooling demand amount of the refrigerant.

[0160] Among them, the second refrigeration demand corresponding to different oil return speeds and different temperature reduction differences can be pre-constructed, and the opening of the second control valve corresponding to different second refrigeration demands can be pre-constructed, and then the second refrigeration demand and the opening of the second control valve can be determined based on these two corresponding relationships.

[0161] Optionally, in an embodiment of the present application, when the scroll compressor is in an ultra-high temperature operating condition, the second control valve can be directly controlled to open to the maximum opening, and the refrigerant provided for the refrigeration function of the air-conditioning system can be turned off first, so as to cool the scroll compressor to the greatest extent, so as to reduce the risk of damage to the scroll compressor. After the oil temperature of the refrigeration oil in the scroll compressor is reduced to a safe oil temperature, the above feasible implementation method is used to control the refrigerant.

[0162] For example, Fig. 20 As shown, a third control valve can be arranged on the inlet side of the evaporator. When the scroll compressor is in an ultra-high temperature operating condition, the second control valve can be directly controlled to open to the maximum opening, and the third control valve can be closed. When the oil temperature of the refrigeration oil in the scroll compressor is reduced to a safe oil temperature, the third control valve is controlled to open to a corresponding opening based on the first refrigeration demand, and the second control valve is controlled to open to a corresponding opening based on the second refrigeration demand.

[0163] In the embodiment of the present application, the third control valve may also be implemented by a controlled valve such as a controlled throttle valve, an electronic expansion valve, etc., but this is not a limitation.

[0164] In the embodiment of the present application, the compressor lubrication system may further include a second temperature sensor. The second temperature sensor may be arranged between the oil temperature control device and the oil inlet of the scroll compressor, for example Fig.21 shown.

[0165] At this time, the temperature value detected by the second temperature sensor can also be obtained, and when the temperature value detected by the second temperature sensor is lower than the preset first stop temperature, the oil temperature control device is controlled to stop cooling the refrigeration oil flowing through the oil temperature control device. In this way, the refrigeration work can be stopped in time, which can save energy consumption on the one hand, and on the other hand, it can also prevent the oil temperature from being too low and thus affecting the subsequent separation effect of the refrigeration oil and the refrigerant, thereby causing too much refrigeration oil to enter the air-conditioning system and affect the heat exchange of the air-conditioning system.

[0166] Considering that in a low temperature environment, the viscosity of the refrigeration oil will increase and the fluidity will deteriorate, which will cause the refrigeration oil to be unable to effectively lubricate the various components of the scroll compressor, thereby increasing friction and wear, which may cause the scroll compressor to fail to start or run unstably, thereby affecting the reliability of the scroll compressor. Therefore, in a feasible implementation of an embodiment of the present application, before starting the scroll compressor, the ambient temperature and the oil temperature of the refrigeration oil in the compressor lubrication system can be obtained to determine whether the ambient temperature is lower than or equal to the preset ambient temperature threshold and whether the oil temperature of the refrigeration oil is lower than or equal to the preset start-up oil temperature threshold. When the ambient temperature is lower than or equal to the preset ambient temperature threshold and the oil temperature of the refrigeration oil is lower than or equal to the preset start-up oil temperature threshold, the oil temperature control device is controlled to heat the refrigeration oil flowing through the oil temperature control device. In this way, the oil temperature of the scroll compressor will not be too low when it is started, thereby improving the startup success rate and operation stability of the scroll compressor.

[0167] Exemplarily, the preset ambient temperature threshold and the preset starting oil temperature threshold can be set according to the situation of the scroll compressor. For example, the preset ambient temperature threshold can be set to -10 degrees, and the preset starting oil temperature threshold can be set to a value between 0 degrees and 5 degrees.

[0168] In a feasible implementation of the embodiment of the present application, before starting the scroll compressor, only the oil temperature of the refrigeration oil in the compressor lubrication system may be obtained to determine whether the oil temperature of the refrigeration oil is lower than or equal to a preset start-up oil temperature threshold. When the oil temperature of the refrigeration oil is lower than or equal to the preset start-up oil temperature threshold, the oil temperature control device is controlled to heat the refrigeration oil flowing through the oil temperature control device.

[0169] In the embodiment of the present application, the scroll compressor can also be started when the oil temperature of the refrigeration oil is higher than the preset start oil temperature threshold. At this time, the oil temperature control device can be controlled to stop heating the refrigeration oil flowing through the oil temperature control device.

[0170] In an embodiment of the present application, a heating device may be provided in the oil temperature control device, such as a PTC ceramic heater, so as to achieve heating control of the refrigeration oil.

[0171] Similar to the first embodiment, the compressor lubrication system of this embodiment may also include an oil collection tank. The oil collection tank may be arranged between the oil outlet of the oil-gas separator and the oil temperature control device, for example Fig. 22 shown.

[0172] Similar to the first embodiment, the compressor lubrication system of this embodiment may also include a filter. The filter may be arranged between the oil outlet of the oil-gas separator and the oil temperature control device, or between the oil temperature control device and the oil inlet of the scroll compressor, for example Fig.23 As shown, by setting a filter, impurities in the refrigeration oil in the compressor lubrication system can be filtered, so that the compressor lubrication system has good cleanliness.

[0173] Similar to the first embodiment, in this embodiment, Fig.24 As shown, the compressor lubrication system may further include a third flow detection sensor. The third flow detection sensor may be arranged between the filter and the oil inlet of the scroll compressor. At this time, the flow data detected by the third flow detection sensor may be obtained, and when the difference between the flow data detected by the third flow detection sensor and the preset calibration value exceeds the preset difference range, the filter replacement reminder may be given according to the preset prompting method.

[0174] Similar to the first embodiment, in this embodiment, Fig.25 As shown, the compressor lubrication system may also include a first pressure sensor and a second pressure sensor. The first pressure sensor is arranged at the front end of the filter, and the second pressure sensor is arranged at the rear end of the filter. At this time, the detection values ​​of the first pressure sensor and the second pressure sensor can be obtained, and the pressure difference at both ends of the filter can be determined according to the detection values ​​of the first pressure sensor and the second pressure sensor. When the pressure difference exceeds the preset pressure difference threshold, the filter replacement reminder is performed according to the preset prompt method.

[0175] The prompting method may refer to that described in the first embodiment, which will not be described in detail here.

[0176] Based on the oil return control method of the compressor lubrication system provided in the embodiment of the present application, by acquiring the current oil temperature of the scroll compressor and the target oil temperature of the scroll compressor, it is determined whether the refrigerant oil in the scroll compressor is overheated (if the difference between the current oil temperature and the target oil temperature exceeds the preset temperature difference threshold, it is considered that the refrigerant oil in the scroll compressor is overheated). When this situation occurs, the oil temperature control device is promptly controlled to cool the refrigerant oil flowing through the oil temperature control device. In this way, the overheated refrigerant oil can be cooled in time, the probability of the aforementioned problem occurring is reduced, and the risk of reduced volumetric efficiency of the scroll compressor is reduced.

[0177] Embodiment three:

[0178] In the embodiments of the present application, the various implementations described in Embodiment 1 and Embodiment 2 can be combined with each other to form new implementations.

[0179] In the embodiment of the present application, the oil-gas separator can be implemented by using an oil-gas separator with an oil-gas separation rate exceeding 99% to reduce the amount of refrigerant oil entering the air-conditioning system.

[0180] In the embodiment of the present application, the refrigeration oil may be an oil that has poor solubility with the refrigerant, such as mineral oil.

[0181] To facilitate understanding of the solution of the embodiment of the present application, Fig.26 Taking the structure shown as an example, the scheme of the embodiment of the present application is exemplified.

[0182] like Fig.26 As shown, the compressor lubrication system includes a scroll compressor, an oil-gas separator, an oil collection tank, a filter, a first temperature sensor, a first flow detection sensor, an oil pump, a first control valve, an oil temperature control device, and a second temperature sensor. After the scroll compressor is running, the refrigeration oil is separated by the oil-gas separator and flows into the oil collection tank for temporary storage.

[0183] When starting the scroll compressor, first collect the ambient temperature and the temperature of the refrigeration oil. Determine whether the ambient temperature is lower than or equal to the preset ambient temperature threshold and whether the temperature of the refrigeration oil is lower than or equal to the preset start-up oil temperature threshold. If so, control the oil temperature control device to heat the refrigeration oil flowing through the oil temperature control device. If not, start the scroll compressor with a heat engine.

[0184] In the process of controlling the oil temperature control device to heat the refrigeration oil flowing through the oil temperature control device, the oil pump is also started and the first control valve is opened to circulate the refrigeration oil in the compressor lubrication system, so as to continuously send the heated refrigeration oil into the scroll compressor. In this process, the scroll compressor can also be started at a low speed to drive the refrigeration oil to circulate in the compressor lubrication system.

[0185] During this process, the oil temperature of the refrigeration oil can be continuously collected, and it can be determined whether the oil temperature of the refrigeration oil is higher than a preset start-up oil temperature threshold.

[0186] When the oil temperature is higher than a preset starting oil temperature threshold, the oil temperature control device is controlled to stop heating the refrigeration oil and start the scroll compressor by hot engine.

[0187] After the scroll compressor is started, the rotation speed, exhaust temperature and exhaust pressure of the scroll compressor can be continuously collected, and the current oil return demand of the scroll compressor can be determined accordingly, and the rotation speed of the oil pump or the opening of the first control valve can be adjusted according to the oil return demand and the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor. In addition, the current oil temperature of the scroll compressor can be continuously collected, and it is determined whether the difference between the current oil temperature and the target oil temperature corresponding to the current working condition exceeds the preset temperature difference threshold. If it exceeds, the oil temperature control device is controlled to cool the refrigeration oil flowing through the oil temperature control device until the oil temperature drops to the target oil temperature.

[0188] In the embodiments of the present application, the execution entity of the methods of Embodiment 1, Embodiment 2 and Embodiment 3 may be a controller that is communicatively connected to the compressor lubrication system, for example, it may be a central controller or MCU (Microcontroller Unit) on a vehicle, or it may be an on-board terminal on a vehicle, or it may be an on-board air-conditioning control chip, etc.

[0189] Embodiment 4:

[0190] Based on the same inventive concept, the present application also provides an oil return control device 270 for a compressor lubrication system and an oil return control device 280 for a compressor lubrication system. Fig. 27 and Fig.28 As shown, Fig. 27 Shows the use of Figure 1 The oil return control device 270 of the method shown, Fig.28 Shows the use of Fig.15 The oil return control device 280 of the method shown. The specific functions of the devices 270 and 280 can be referred to the description above. To avoid repetition, the detailed description is appropriately omitted here. The devices 270 and 280 include at least one software function module that can be stored in a memory in the form of software or firmware or solidified in the operating system of the devices 270 and 280. The structure of the compressor lubrication system can be referred to the description of the first and second embodiments. Specifically:

[0191] See also Fig. 27 As shown, the device 270 includes: a first acquisition module 271 and a first control module 272. Among them:

[0192] A first acquisition module 271 is used to acquire the operating parameters of the scroll compressor; the operating parameters include the exhaust temperature, suction temperature, exhaust pressure and suction pressure of the scroll compressor;

[0193] The first control module 272 is used to determine the current oil return demand of the scroll compressor based on the operating parameters of the scroll compressor, and to control the oil return capacity of the oil return quantity control device based on the oil return demand and the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor.

[0194] In a feasible implementation of the embodiment of the present application, the operating parameters may also include the rotation speed and / or power consumption of the scroll compressor.

[0195] In a feasible implementation of the embodiment of the present application, when the compressor lubrication system also includes a first flow detection sensor, the first acquisition module 271 is also used to obtain the flow data detected by the first flow detection sensor, and determine the actual oil return amount of the scroll compressor based on the flow data; the first control module 272 is also used to close the oil return amount control device when the actual oil return amount reaches the current oil return demand of the scroll compressor, or adjust the oil return capacity of the oil return amount control device to match the oil output per unit time of the oil outlet of the scroll compressor.

[0196] In the above feasible implementation manner, the compressor lubrication system may further include an oil collecting tank; the oil collecting tank is arranged between the oil outlet of the oil-gas separator and the oil return quantity control device, and the first flow detection sensor is arranged behind the oil collecting tank.

[0197] In a feasible implementation of the embodiment of the present application, the first control module 272 is specifically used to: obtain the corresponding relationship between the operating parameters and the oil return demand when the scroll compressor is at the target operating efficiency; and determine the current oil return demand of the scroll compressor from the corresponding relationship based on the operating parameters of the scroll compressor.

[0198] In the above-mentioned feasible implementation manner, the first control module 272 is also specifically used for: before determining the current oil return demand of the scroll compressor according to the operating parameters of the scroll compressor, obtaining the current operating condition of the scroll compressor and obtaining the target corresponding relationship corresponding to the current operating condition; the target corresponding relationship is: under the current operating condition, when the scroll compressor is at the target operating efficiency, the corresponding relationship between the operating parameters and the oil return demand; according to the operating parameters of the scroll compressor, determining the current oil return demand of the scroll compressor from the target corresponding relationship.

[0199] In another feasible implementation of the embodiment of the present application, when the compressor lubrication system further includes a second flow detection sensor, and the second flow detection sensor is disposed at the oil outlet of the oil-gas separator, or when the compressor lubrication system further includes an oil quantity detection device, which is disposed on the scroll compressor and is used to detect the amount of refrigeration oil in the scroll compressor, the first control module 272 is specifically used to:

[0200] Obtain the detection value of the second flow detection sensor, and determine the amount of refrigerant oil in the scroll compressor based on the amount of refrigerant oil stored in the scroll compressor, the detection value of the second flow detection sensor and the oil-gas separation rate of the oil-gas separator; or, obtain the amount of refrigerant oil in the scroll compressor detected by the oil amount detection device; obtain the corresponding relationship between the operating parameters and the refrigerant oil demand when the scroll compressor is at the target operating efficiency; determine the current refrigerant oil demand of the scroll compressor from the corresponding relationship based on the operating parameters of the scroll compressor; calculate the difference between the current refrigerant oil demand of the scroll compressor and the amount of refrigerant oil in the scroll compressor, and obtain the current oil return demand of the scroll compressor.

[0201] In the above-mentioned feasible implementation manner, the first control module 272 is also specifically used for: obtaining the current operating condition of the scroll compressor before determining the current oil return demand of the scroll compressor according to the operating parameters of the scroll compressor; obtaining the correspondence between the operating parameters and the refrigeration oil demand when the scroll compressor is at the target operating efficiency, including: obtaining the target correspondence corresponding to the current operating condition; the target correspondence is: under the current operating condition, the correspondence between the operating parameters and the refrigeration oil demand when the scroll compressor is at the target operating efficiency; determining the current refrigeration oil demand of the scroll compressor from the correspondence according to the operating parameters of the scroll compressor, including: determining the current refrigeration oil demand of the scroll compressor from the target correspondence according to the operating parameters of the scroll compressor.

[0202] In a feasible implementation of the embodiment of the present application, the return oil quantity control device includes a first control valve; the first control module 272 is specifically used to control the opening of the first control valve according to the return oil demand and the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor.

[0203] In a feasible implementation of the embodiment of the present application, the return oil quantity control device includes an oil pump; the first control module 272 is specifically used to control the speed of the oil pump according to the return oil demand and the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor.

[0204] In a feasible implementation of the embodiment of the present application, the oil return quantity control device includes an oil pump and a first control valve; the first control module 272 is specifically used to: determine a target oil return speed according to the oil return demand and a preset oil return time; if the first control valve can reach the target oil return speed at the maximum opening under the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor, then the opening of the first control valve is controlled according to the target oil return speed and the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor; if the first control valve cannot reach the target oil return speed at the maximum opening under the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor, then the first control valve is controlled to be at the maximum opening, and the speed of the oil pump is controlled according to the difference between the target oil return speed and the maximum opening oil return speed; wherein the maximum opening oil return speed is: the oil return speed of the first control valve at the maximum opening when the oil pump is not running under the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor.

[0205] In a feasible implementation of the embodiment of the present application, the compressor lubrication system also includes a filter, which is arranged between the oil outlet of the oil-gas separator and the oil return quantity control device, or between the oil return quantity control device and the oil inlet of the scroll compressor.

[0206] In the above-mentioned feasible implementation manner, the compressor lubrication system also includes a third flow detection sensor, which is arranged between the filter and the oil inlet of the scroll compressor; the first acquisition module 271 is also used to obtain the flow data detected by the third flow detection sensor; the first control module 272 is also used to remind the filter to change the filter in a preset prompting manner when the difference between the flow data detected by the third flow detection sensor and the preset calibration value exceeds a preset difference range.

[0207] In the above-mentioned feasible implementation mode, the compressor lubrication system also includes a first pressure sensor and a second pressure sensor, the first pressure sensor is arranged at the front end of the filter, and the second pressure sensor is arranged at the rear end of the filter; the first acquisition module 271 is also used to obtain the detection values ​​of the first pressure sensor and the second pressure sensor; the first control module 272 is also used to determine the pressure difference at both ends of the filter according to the detection values ​​of the first pressure sensor and the second pressure sensor; when the pressure difference exceeds the preset pressure difference threshold, the filter replacement reminder is given according to the preset prompt method.

[0208] In a feasible implementation of the embodiment of the present application, the compressor lubrication system also includes an oil temperature control device; the oil temperature control device is arranged between the oil outlet of the oil-gas separator and the return oil quantity control device, or is arranged between the return oil quantity control device and the oil inlet of the scroll compressor; the first acquisition module 271 is also used to obtain the current oil temperature of the scroll compressor and the target oil temperature of the scroll compressor; the target oil temperature is the oil temperature that can make the scroll compressor at the target operating efficiency; the first control module 272 is also used to control the oil temperature control device to cool the refrigerant oil flowing through the oil temperature control device when the difference between the current oil temperature and the target oil temperature exceeds a preset temperature difference threshold.

[0209] In an optional embodiment of the above-mentioned feasible implementation mode, the compressor lubrication system also includes: a first temperature sensor, which is arranged in the scroll compressor, or at the air outlet of the scroll compressor, or at the inlet of the oil-gas separator, or at the oil outlet of the oil-gas separator; the first acquisition module 271 is specifically used to obtain the temperature value detected by the first temperature sensor; the temperature value detected by the first temperature sensor represents the current oil temperature of the scroll compressor.

[0210] In an optional embodiment of the above-mentioned feasible implementation mode, the first acquisition module 271 is specifically used to obtain the current operating condition of the scroll compressor; and determine the target oil temperature corresponding to the current operating condition according to the current operating condition.

[0211] In an optional embodiment of the above-mentioned feasible implementation mode, the air outlet of the oil-gas separator is configured to be connected to the air-conditioning system to transmit the refrigerant output by the scroll compressor into the air-conditioning system; the working conditions of the scroll compressor include: a first working condition for cooperating with the air-conditioning system for refrigeration, and a second working condition for cooperating with the air-conditioning system for heating.

[0212] In the above optional embodiment, the first control module 272 is specifically used to: obtain the oil return speed of the refrigerant oil in the compressor lubrication system; control the refrigeration intensity of the oil temperature control device according to the difference between the oil return speed, the current oil temperature and the target oil temperature, so as to cool the refrigerant oil flowing through the oil temperature control device.

[0213] In the above optional embodiment, the air outlet of the oil-gas separator is configured to be connected to the air-conditioning system so as to transmit the refrigerant output by the scroll compressor into the air-conditioning system; the air-conditioning system includes a condenser; the oil temperature control device includes: a first pipe for supplying refrigerant flow and a second control valve; the second control valve is arranged on the first pipe, one end of the first pipe is connected to the outlet side of the condenser, and the other end of the first pipe is connected to the intake port of the scroll compressor; the first control module 272 is specifically used to: control the opening of the second control valve according to the difference between the oil return speed, the current oil temperature and the target oil temperature.

[0214] In the above optional embodiment, before the first control module 272 controls the opening of the second control valve according to the return oil speed, the difference between the current oil temperature and the target oil temperature, the first acquisition module 271 is also used to obtain the first cooling demand for refrigerant in the air-conditioning system; the first control module 272 is specifically used to: determine the remaining amount of refrigerant available for the oil temperature control device according to the total amount of the refrigerant and the first cooling demand of the refrigerant; determine the second cooling demand of the refrigerant according to the difference between the return oil speed, the current oil temperature and the target oil temperature; when the second cooling demand is greater than or equal to the remaining amount of refrigerant, control the opening of the second control valve according to the remaining amount of refrigerant; when the second cooling demand is less than the remaining amount of refrigerant, control the opening of the second control valve according to the second cooling demand.

[0215] In an optional embodiment of the above-mentioned feasible implementation mode, the compressor lubrication system also includes: a second temperature sensor, which is arranged between the oil temperature control device and the oil inlet of the scroll compressor; the first acquisition module 271 is also used to obtain the temperature value detected by the second temperature sensor; the first control module 272 is also used to control the oil temperature control device to stop cooling the refrigerant oil flowing through the oil temperature control device when the temperature value detected by the second temperature sensor is lower than a preset first stop temperature.

[0216] In an optional embodiment of the above-mentioned feasible implementation mode, the first acquisition module 271 is also used to obtain the ambient temperature and the oil temperature of the refrigerant oil in the compressor lubrication system before starting the scroll compressor; the first control module 272 is also used to: determine whether the ambient temperature is lower than or equal to the preset ambient temperature threshold and whether the oil temperature of the refrigerant oil is lower than or equal to the preset starting oil temperature threshold; when the ambient temperature is lower than or equal to the preset ambient temperature threshold and the oil temperature of the refrigerant oil is lower than or equal to the preset starting oil temperature threshold, control the oil temperature control device to heat the refrigerant oil flowing through the oil temperature control device.

[0217] In the above optional embodiment, the first control module 272 is further used to start the scroll compressor when the oil temperature of the refrigeration oil is higher than the preset starting oil temperature threshold.

[0218] See also Fig.28 As shown, the device 280 includes: a second acquisition module 281 and a second control module 282. Among them:

[0219] The second acquisition module 281 is used to acquire the current oil temperature of the scroll compressor and the target oil temperature of the scroll compressor; the target oil temperature is the oil temperature that can make the scroll compressor operate at a target efficiency;

[0220] The second control module 282 is used to control the oil temperature control device to cool the refrigeration oil flowing through the oil temperature control device when the difference between the current oil temperature and the target oil temperature exceeds a preset temperature difference threshold.

[0221] In a feasible implementation of the embodiment of the present application, the compressor lubrication system also includes: a first temperature sensor, which is arranged in the scroll compressor, or at the air outlet of the scroll compressor, or at the inlet of the oil-gas separator, or at the oil outlet of the oil-gas separator; the second acquisition module 281 is specifically used to: obtain the temperature value detected by the first temperature sensor; the temperature value detected by the first temperature sensor represents the current oil temperature of the scroll compressor.

[0222] In a feasible implementation of the embodiment of the present application, the second acquisition module 281 is specifically used to: obtain the current operating condition of the scroll compressor; and determine the target oil temperature corresponding to the current operating condition based on the current operating condition.

[0223] In a feasible implementation of the embodiment of the present application, the air outlet of the oil-gas separator is configured to be connected to the air-conditioning system to transmit the refrigerant output by the scroll compressor into the air-conditioning system; the working conditions of the scroll compressor include: a first working condition for cooperating with the air-conditioning system for refrigeration, and a second working condition for cooperating with the air-conditioning system for heating.

[0224] In the above-mentioned feasible implementation manner, the second control module 282 is specifically used to: obtain the oil return speed of the refrigerant oil in the compressor lubrication system; control the refrigeration intensity of the oil temperature control device according to the difference between the oil return speed, the current oil temperature and the target oil temperature, so as to cool the refrigerant oil flowing through the oil temperature control device.

[0225] In the above-mentioned feasible implementation manner, the air outlet of the oil-gas separator is configured to be connected to the air-conditioning system so as to transmit the refrigerant output by the scroll compressor into the air-conditioning system; the air-conditioning system includes a condenser; the oil temperature control device includes: a first pipe for supplying refrigerant flow and a second control valve; the second control valve is arranged on the first pipe, one end of the first pipe is connected to the outlet side of the condenser, and the other end of the first pipe is connected to the suction port of the scroll compressor; the second control module 282 is specifically used to: control the opening of the second control valve according to the difference between the oil return speed, the current oil temperature and the target oil temperature.

[0226] In the above-mentioned feasible implementation manner, before the second control module 282 controls the opening of the second control valve according to the return oil speed, the difference between the current oil temperature and the target oil temperature, the second acquisition module 281 is also used to obtain the first cooling demand for refrigerant in the air-conditioning system; the second control module 282 is specifically used to: determine the remaining amount of refrigerant available for the oil temperature control device according to the total amount of the refrigerant and the first cooling demand of the refrigerant; determine the second cooling demand of the refrigerant according to the difference between the return oil speed, the current oil temperature and the target oil temperature; when the second cooling demand is greater than or equal to the remaining amount of refrigerant, control the opening of the second control valve according to the remaining amount of refrigerant; when the second cooling demand is less than the remaining amount of refrigerant, control the opening of the second control valve according to the second cooling demand.

[0227] In a feasible implementation of the embodiment of the present application, the compressor lubrication system also includes: a second temperature sensor, arranged between the oil temperature control device and the oil inlet of the scroll compressor; the second acquisition module 281 is also used to obtain the temperature value detected by the second temperature sensor; the second control module 282 is also used to control the oil temperature control device to stop cooling the refrigerant oil flowing through the oil temperature control device when the temperature value detected by the second temperature sensor is lower than a preset first stop temperature.

[0228] In a feasible implementation of the embodiment of the present application, the second acquisition module 281 is also used to obtain the ambient temperature and the oil temperature of the refrigerant oil in the compressor lubrication system before starting the scroll compressor; the second control module 282 is also used to: determine whether the ambient temperature is lower than or equal to the preset ambient temperature threshold and whether the oil temperature of the refrigerant oil is lower than or equal to the preset starting oil temperature threshold; when the ambient temperature is lower than or equal to the preset ambient temperature threshold and the oil temperature of the refrigerant oil is lower than or equal to the preset starting oil temperature threshold, control the oil temperature control device to heat the refrigerant oil flowing through the oil temperature control device.

[0229] In a feasible implementation of the embodiment of the present application, the second control module 282 is further used to start the scroll compressor when the oil temperature of the refrigeration oil is higher than the preset start-up oil temperature threshold.

[0230] In a feasible implementation of the embodiment of the present application, the compressor lubrication system also includes a filter, which is arranged between the oil outlet of the oil-gas separator and the oil temperature control device, or between the oil temperature control device and the oil inlet of the scroll compressor.

[0231] In this feasible embodiment, the compressor lubrication system also includes a third flow detection sensor, which is arranged between the oil outlet of the oil-gas separator and the oil temperature control device, or between the oil temperature control device and the oil inlet of the scroll compressor; the second acquisition module 281 is also used to obtain the flow data detected by the third flow detection sensor; the second control module 282 is also used to remind the filter to change the filter in a preset prompting manner when the difference between the flow data detected by the third flow detection sensor and the preset calibration value exceeds a preset difference range.

[0232] In this feasible embodiment, the compressor lubrication system also includes a first pressure sensor and a second pressure sensor, the first pressure sensor is arranged at the front end of the filter, and the second pressure sensor is arranged at the rear end of the filter; the second acquisition module 281 is also used to obtain the detection values ​​of the first pressure sensor and the second pressure sensor; the second control module 282 is also used to determine the pressure difference at both ends of the filter according to the detection values ​​of the first pressure sensor and the second pressure sensor, and when the pressure difference exceeds the preset pressure difference threshold, the filter replacement reminder is issued according to the preset prompt method.

[0233] In a feasible implementation manner of the embodiment of the present application, the compressor lubrication system also includes an oil collecting tank; the oil collecting tank is arranged between the oil outlet of the oil-gas separator and the oil temperature control device.

[0234] For the sake of brevity, some of the contents described in Embodiment 1, Embodiment 2, and Embodiment 3 are not repeated in this embodiment.

[0235] Embodiment five:

[0236] The embodiment of the present application also provides a control system, which includes a controller and a compressor lubrication system. The compressor lubrication system is shown in Embodiments 1 to 3. The controller is connected to the scroll compressor, the oil return quantity control device and / or the oil temperature control device in the compressor lubrication system, and various sensors in communication, so that the controller can execute any of the oil return control methods described in Embodiments 1 to 3.

[0237] In the embodiment of the present application, the controller may be, but is not limited to, a central controller or MCU (Microcontroller Unit) on a vehicle, or it may be an on-board terminal on a vehicle, or it may be an on-board air conditioning control chip, etc.

[0238] In the embodiments of the present application, the control system may further include more components, such as a memory, and one or more programs may be stored in the memory for execution by the controller, thereby implementing any of the oil return control methods described in Embodiments 1 to 3. For another example, an internal communication bus may be included to implement communication between the controller and the memory; for another example, an external communication interface may be provided, such as a USB (Universal Serial Bus) interface, a CAN (Controller Area Network) bus interface, etc., to implement connection between the controller and the compressor lubrication system; for another example, an information display component such as a display screen may also be provided, but this is not a limitation.

[0239] An embodiment of the present application also provides a vehicle, which includes the aforementioned control system.

[0240] In the embodiments of the present application, the means of transportation may be, but is not limited to, vehicles (such as fuel vehicles, new energy vehicles, etc.), ships, trains, aircraft (such as airplanes, etc.), and the like.

[0241] In the embodiment of the present application, in addition to the aforementioned control system, the vehicle may also have other devices, which is not limited by the embodiment of the present application.

[0242] Based on the same inventive concept, this embodiment further provides a computer-readable storage medium, such as a floppy disk, an optical disk, a hard disk, a flash memory, a USB flash disk, an SD (Secure Digital Memory Card) card, an MMC (Multimedia Card) card, etc., in which one or more programs for implementing the above steps are stored, and the one or more programs can be executed by one or more controllers to implement any of the oil return control methods described in Embodiments 1 to 3. No further description is given here.

[0243] In the embodiments provided in the present application, the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0244] In addition, the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0245] Furthermore, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0246] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0247] As used herein, a plurality refers to two or more than two.

[0248] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for controlling oil return of a compressor lubrication system, characterized in that: The compressor lubrication system comprises: a scroll compressor, an oil-gas separator connected to the air outlet of the scroll compressor, the oil outlet of the oil-gas separator being connected to the oil inlet of the scroll compressor via an oil temperature control device; the method comprises: Acquire the current oil temperature of the scroll compressor and the target oil temperature of the scroll compressor; the target oil temperature is the oil temperature that can make the scroll compressor operate at a target efficiency; When the difference between the current oil temperature and the target oil temperature exceeds a preset temperature difference threshold, the oil temperature control device is controlled to cool the refrigeration oil flowing through the oil temperature control device.

2. The oil return control method of the compressor lubrication system according to claim 1, characterized in that: The compressor lubrication system further includes: a first temperature sensor, which is arranged in the scroll compressor, or at the air outlet of the scroll compressor, or at the inlet of the oil-gas separator, or at the oil outlet of the oil-gas separator; Obtaining the current oil temperature of the scroll compressor includes: A temperature value detected by the first temperature sensor is acquired; the temperature value detected by the first temperature sensor represents a current oil temperature of the scroll compressor.

3. The oil return control method of the compressor lubrication system according to claim 1, characterized in that: Obtaining the target oil temperature of the scroll compressor includes: Acquiring the current working condition of the scroll compressor; A target oil temperature corresponding to the current operating condition is determined according to the current operating condition.

4. The oil return control method of the compressor lubrication system according to claim 1, characterized in that: The gas outlet of the oil-gas separator is configured to be connected to an air conditioning system so as to transfer the refrigerant output by the scroll compressor into the air conditioning system; The working conditions of the scroll compressor include: a first working condition for cooperating with the air-conditioning system for cooling, and a second working condition for cooperating with the air-conditioning system for heating.

5. The oil return control method of the compressor lubrication system according to claim 3, characterized in that: Controlling the oil temperature control device to cool the refrigeration oil flowing through the oil temperature control device includes: Obtaining the oil return speed of the refrigerant oil in the compressor lubrication system; The refrigeration intensity of the oil temperature control device is controlled according to the oil return speed, the difference between the current oil temperature and the target oil temperature, so as to cool the refrigeration oil flowing through the oil temperature control device.

6. The oil return control method of the compressor lubrication system according to claim 5, characterized in that: The gas outlet of the oil-gas separator is configured to be connected to an air conditioning system so as to transfer the refrigerant output by the scroll compressor into the air conditioning system; The air conditioning system includes a condenser; the oil temperature control device includes: a first pipe for the flow of refrigerant and a second control valve; the second control valve is arranged on the first pipe, one end of the first pipe is connected to the outlet side of the condenser, and the other end of the first pipe is connected to the suction port of the scroll compressor; Controlling the refrigeration intensity of the oil temperature control device according to the difference between the oil return speed and the current oil temperature and the target oil temperature includes: The opening degree of the second control valve is controlled according to the oil return speed, a difference between the current oil temperature and the target oil temperature.

7. The oil return control method of the compressor lubrication system according to claim 6, characterized in that: Before controlling the opening of the second control valve according to the oil return speed and the difference between the current oil temperature and the target oil temperature, the method further includes: Obtaining a first cooling demand for a refrigerant in the air-conditioning system; Determining the remaining amount of refrigerant available for use by the oil temperature control device according to the total amount of the refrigerant and the first refrigeration demand of the refrigerant; Controlling the opening of the second control valve according to the difference between the oil return speed and the current oil temperature and the target oil temperature includes: determining a second cooling demand of the refrigerant according to the oil return speed, the difference between the current oil temperature and the target oil temperature; When the second refrigeration demand is greater than or equal to the remaining refrigerant amount, controlling the opening of the second control valve according to the remaining refrigerant amount; When the second refrigeration demand is less than the remaining refrigerant amount, the opening of the second control valve is controlled according to the second refrigeration demand.

8. The oil return control method of the compressor lubrication system according to claim 1, characterized in that: The compressor lubrication system further includes: a second temperature sensor disposed between the oil temperature control device and the oil inlet of the scroll compressor; the method further includes: Acquire the temperature value detected by the second temperature sensor; When the temperature value detected by the second temperature sensor is lower than a preset first stop temperature, the oil temperature control device is controlled to stop cooling the refrigeration oil flowing through the oil temperature control device.

9. The oil return control method of a compressor lubrication system according to any one of claims 1 to 8, characterized in that: The method further comprises: Before starting the scroll compressor, obtaining the ambient temperature and the oil temperature of the refrigeration oil in the compressor lubrication system; Determining whether the ambient temperature is lower than or equal to a preset ambient temperature threshold and whether the oil temperature of the refrigeration oil is lower than or equal to a preset start-up oil temperature threshold; When the ambient temperature is lower than or equal to a preset ambient temperature threshold and the oil temperature of the refrigeration oil is lower than or equal to a preset start-up oil temperature threshold, the oil temperature control device is controlled to heat the refrigeration oil flowing through the oil temperature control device.

10. The oil return control method of the compressor lubrication system according to claim 9, characterized in that: The method further comprises: When the oil temperature of the refrigeration oil is higher than the preset start-up oil temperature threshold, the scroll compressor is started.

11. The oil return control method of a compressor lubrication system according to any one of claims 1 to 8, characterized in that: The compressor lubrication system further comprises a filter, which is arranged between the oil outlet of the oil-gas separator and the oil temperature control device, or between the oil temperature control device and the oil inlet of the scroll compressor.

12. The oil return control method of the compressor lubrication system according to claim 11, characterized in that: The compressor lubrication system further includes a third flow detection sensor, and the third flow detection sensor is arranged between the filter and the oil inlet of the scroll compressor; the method further includes: Acquiring flow data detected by the third flow detection sensor; When the difference between the flow data detected by the third flow detection sensor and the preset calibration value exceeds a preset difference range, a filter replacement reminder is given in a preset prompting manner.

13. The oil return control method of the compressor lubrication system according to claim 11, characterized in that: The compressor lubrication system further includes a first pressure sensor and a second pressure sensor, wherein the first pressure sensor is disposed at a front end of the filter and the second pressure sensor is disposed at a rear end of the filter; the method further includes: Acquire detection values ​​of the first pressure sensor and the second pressure sensor, and determine the pressure difference between the two ends of the filter according to the detection values ​​of the first pressure sensor and the second pressure sensor; When the pressure difference exceeds a preset pressure difference threshold, a filter replacement reminder is given in a preset prompting manner.

14. The oil return control method of a compressor lubrication system according to any one of claims 1 to 8, characterized in that: The compressor lubrication system also includes an oil collecting tank; the oil collecting tank is arranged between the oil outlet of the oil-gas separator and the oil temperature control device.

15. An oil return control device for a compressor lubrication system, characterized in that: The compressor lubrication system comprises: a scroll compressor, an oil-gas separator connected to the air outlet of the scroll compressor, the oil outlet of the oil-gas separator being connected to the oil inlet of the scroll compressor via an oil temperature control device; the oil return control device comprises: A second acquisition module is used to acquire the current oil temperature of the scroll compressor and the target oil temperature of the scroll compressor; the target oil temperature is the oil temperature that can make the scroll compressor operate at a target efficiency; The second control module is used to control the oil temperature control device to cool the refrigeration oil flowing through the oil temperature control device when the difference between the current oil temperature and the target oil temperature exceeds a preset temperature difference threshold.

16. A control system, characterized in that: include: Controllers and compressor lubrication systems; The compressor lubrication system includes: a scroll compressor, an oil-gas separator connected to the air outlet of the scroll compressor, the oil outlet of the oil-gas separator is connected to the oil inlet of the scroll compressor through an oil temperature control device; the controller is connected to the scroll compressor and the oil temperature control device; the controller is used to execute the oil return control method of the compressor lubrication system as described in any one of claims 1-14.

17. A means of transport, characterized in that: Comprising a control system as claimed in claim 16.

18. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores one or more programs, and the one or more programs can be executed by one or more controllers to implement the oil return control method of the compressor lubrication system according to any one of claims 1-14.

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