Refrigerant system control method and device, vehicle and storage medium

Abstract

The invention relates to a refrigerant system control method and device, a vehicle and a storage medium. The refrigerant system control method comprises the steps that the air inlet amount, compressor air inlet state parameters, condenser target output parameters and condenser feedback output parameters are obtained; performing closed-loop control according to the target output parameters of the condenser and the feedback output parameters of the condenser, and determining exhaust state parameters of the compressor; target heat exchange parameters of a condenser are determined according to the exhaust state parameters of the compressor; closed-loop control is conducted according to the target heat exchange parameters of the condenser and the feedback output parameters of the condenser, and environment temperature parameters are determined; target output parameters of the condenser are updated according to the environment temperature parameters, the air inlet amount and the exhaust state parameters of the compressor; and controlling the compressor based on the compressor exhaust state parameters and controlling the condenser based on the updated condenser target output parameters. According to the embodiment of the invention, the control accuracy of the refrigerant system can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle temperature control, in particular to a refrigerant system control method, a refrigerant system control device, a vehicle and a computer readable storage medium. BACKGROUND

[0002] In the related art, the temperature sensor deployed on the vehicle is used as a detection parameter of the environment, and then the refrigerant system of the vehicle is controlled. However, since the temperature sensor is arranged between the front engine compartment intake grille and the condenser, the heat backflow caused by the waste heat of the engine, compressor and motor in the engine compartment will cause the temperature sensor to collect a higher temperature than the actual outside temperature, that is, the environment temperature collected by the temperature sensor has a certain error, which further leads to insufficient control accuracy. SUMMARY

[0003] One of the purposes of the present application is to provide a refrigerant system control method to solve the problem of insufficient control accuracy of the vehicle refrigerant control system in the prior art; the second purpose is to provide a refrigerant system control device; the third purpose is to provide a vehicle; and the fourth purpose is to provide a computer readable storage medium.

[0004] In order to achieve the above-mentioned purposes, the technical solutions adopted by the present application are as follows: In a first aspect of the present application, the present application discloses a refrigerant system control method, comprising: obtaining an air intake amount, a compressor intake state parameter, a condenser target output parameter and a condenser feedback output parameter; performing closed-loop control according to the condenser target output parameter and the condenser feedback output parameter to determine a compressor exhaust state parameter; determining a condenser target heat exchange parameter according to the compressor exhaust state parameter; performing closed-loop control according to the condenser target heat exchange parameter and the condenser feedback output parameter to determine an environment temperature parameter; updating the condenser target output parameter according to the environment temperature parameter, the air intake amount and the compressor exhaust state parameter; controlling the compressor based on the compressor exhaust state parameter and controlling the condenser based on the updated condenser target output parameter.

[0005] Optionally, the step of performing closed-loop control according to the condenser target output parameter and the condenser feedback output parameter to determine a compressor exhaust state parameter comprises: determining a compressor intake pressure value according to the condenser target output parameter and the condenser feedback output parameter; According to the compressor suction pressure value and the compressor suction state parameter, a compressor discharge state parameter is determined.

[0006] Optionally, the condenser target output parameter comprises a condenser target output pressure value, the condenser feedback output parameter comprises a condenser feedback output pressure value, and the step of determining the compressor suction pressure value according to the closed-loop control of the condenser target output parameter and the condenser feedback output parameter comprises: determining a pressure difference value of the condenser target output pressure value and the condenser feedback output pressure value; determining the compressor suction pressure value based on the closed-loop control of the pressure difference value and the condenser feedback output pressure value.

[0007] Optionally, the method further comprises: acquiring a compressor performance parameter; constructing a compressor model based on the compressor performance parameter; the step of determining the compressor discharge state parameter according to the compressor suction pressure value and the compressor suction state parameter comprises: determining the compressor discharge state parameter according to the compressor suction pressure value and the compressor suction state parameter based on the compressor model.

[0008] Optionally, the compressor suction state parameter comprises a compressor rotational speed and a compressor suction temperature, and the step of determining the compressor discharge state parameter according to the compressor suction pressure value and the compressor suction state parameter based on the compressor model comprises: substituting the compressor suction pressure value, the compressor rotational speed and the compressor suction temperature into the compressor model to determine a compressor output mass flow and a discharge enthalpy value; determining a compressor discharge temperature value based on a look-up table of preset refrigerant physical property parameters according to the discharge enthalpy value; determining the compressor discharge temperature value and the compressor output mass flow as the compressor discharge state parameter.

[0009] Optionally, the step of constructing the compressor model based on the compressor performance parameter comprises: determining a refrigerant type based on the compressor performance parameter; constructing the compressor model based on refrigerant parameters corresponding to the refrigerant type and the compressor performance parameter.

[0010] Optionally, the compressor model is characterized by a mass flow relationship and a compressor discharge temperature relationship, and the step of constructing the compressor model based on the refrigerant parameters corresponding to the refrigerant type and the compressor performance parameter comprises: determining the mass flow relationship based on the compressor performance parameter; determining the compressor discharge temperature relationship based on the refrigerant parameter and the compressor performance parameter corresponding to the refrigerant type.

[0011] Optionally, the step of determining the condenser target heat exchange parameter according to the compressor discharge state parameter comprises: converting the compressor output mass flow and the compressor discharge temperature value into the condenser target heat exchange amount based on a preset heat exchange strategy; determining the condenser target heat exchange amount as the condenser target heat exchange parameter.

[0012] Optionally, the condenser feedback output parameter comprises a condenser feedback heat exchange amount, and the step of determining the ambient temperature parameter according to the closed-loop control of the condenser target heat exchange parameter and the condenser feedback output parameter comprises: determining a heat difference value of the condenser target heat exchange amount and the condenser feedback heat exchange amount; performing closed-loop control based on the heat difference value and the condenser feedback heat exchange amount to determine the ambient temperature parameter.

[0013] Optionally, the method further comprises: obtaining a condenser size parameter; constructing a condenser equivalent heat exchange model based on the condenser size parameter; The step of updating the condenser target output parameter according to the ambient temperature parameter, the air intake amount, and the compressor discharge state parameter comprises: converting the ambient temperature parameter, the air intake amount, and the compressor discharge state parameter into target update parameters based on the condenser equivalent heat exchange model; updating the condenser target output parameter using the target update parameters.

[0014] Optionally, the step of constructing a condenser equivalent heat exchange model based on the condenser size parameter comprises: constructing a gaseous refrigerant heat exchange region, a two-phase refrigerant heat exchange region, and a liquid refrigerant heat exchange region based on the condenser size parameter; determining a heat exchange relationship of the gaseous refrigerant heat exchange region, a heat exchange relationship of the two-phase refrigerant heat exchange region, and a heat exchange relationship of the liquid refrigerant heat exchange region; combining the heat exchange relationship of the gaseous refrigerant heat exchange region, the heat exchange relationship of the two-phase refrigerant heat exchange region, and the heat exchange relationship of the liquid refrigerant heat exchange region to form the condenser equivalent heat exchange model.

[0015] Optionally, the step of determining the heat transfer relationship of the gaseous refrigerant heat transfer region, the heat transfer relationship of the two-phase refrigerant heat transfer region and the heat transfer relationship of the liquid refrigerant heat transfer region comprises: determining a heat transfer coefficient; determining the heat transfer relationship of the gaseous refrigerant heat transfer region based on a preset convective-conductive heat transfer formula, in combination with the heat transfer area of the gaseous refrigerant heat transfer region and the heat transfer coefficient; determining the heat transfer relationship of the two-phase refrigerant heat transfer region based on a preset convective-conductive heat transfer formula, in combination with the heat transfer area of the two-phase refrigerant heat transfer region and the heat transfer coefficient; determining the heat transfer relationship of the liquid refrigerant heat transfer region based on a preset convective-conductive heat transfer formula, in combination with the heat transfer area of the liquid refrigerant heat transfer region and the heat transfer coefficient.

[0016] Optionally, the step of determining the heat transfer relationship of the gaseous refrigerant heat transfer region, the heat transfer relationship of the two-phase refrigerant heat transfer region and the heat transfer relationship of the liquid refrigerant heat transfer region further comprises: updating the heat transfer coefficient based on the difference between the updated target heat transfer parameter of the condenser and the feedback output parameter of the condenser.

[0017] Optionally, the step of converting the ambient temperature parameter, the air intake amount and the compressor discharge state parameter into target update parameters based on the equivalent heat transfer model of the condenser comprises: converting the ambient temperature parameter, the air intake amount and the compressor discharge state parameter into gaseous refrigerant heat transfer region output parameters based on the heat transfer relationship of the gaseous refrigerant heat transfer region; the gaseous refrigerant heat transfer region output parameters comprise gaseous refrigerant heat transfer region heat transfer amount and gaseous refrigerant heat transfer region output state amount; converting the ambient temperature parameter, the air intake amount and the gaseous refrigerant heat transfer region output state amount into two-phase refrigerant heat transfer region output parameters based on the heat transfer relationship of the two-phase refrigerant heat transfer region; the two-phase refrigerant heat transfer region output parameters comprise two-phase refrigerant heat transfer region heat transfer amount and two-phase refrigerant heat transfer region output state amount; converting the ambient temperature parameter, the air intake amount and the two-phase refrigerant heat transfer region output state amount into liquid refrigerant heat transfer region output parameters based on the heat transfer relationship of the liquid refrigerant heat transfer region; the liquid refrigerant heat transfer region output parameters comprise liquid refrigerant heat transfer region heat transfer amount and liquid refrigerant heat transfer region output state amount; determining the total heat transfer amount of the condenser in combination with the gaseous refrigerant heat transfer region heat transfer amount, the two-phase refrigerant heat transfer region heat transfer amount and the liquid refrigerant heat transfer region heat transfer amount; determining the total heat transfer amount of the condenser as the target update parameter.

[0018] Optionally, the step of obtaining the air intake amount comprises: detecting the air intake amount.

[0019] Optionally, the step of obtaining the air intake amount comprises: determining the air intake amount based on the ambient temperature parameter and the compressor intake state parameter.

[0020] Optionally, the step of determining the air intake amount based on the ambient temperature parameter and the compressor intake state parameter comprises: determining a vehicle speed in combination with the ambient temperature parameter and the compressor intake state parameter; determining the air intake amount based on the vehicle speed.

[0021] Optionally, the method further comprises: determining a refrigerant system operating state; in the case where the refrigerant system operating state is a fault state, displaying a preset ambient temperature; in the case where the refrigerant system operating state is a normal state, displaying the ambient temperature parameter.

[0022] Optionally, the step of displaying the ambient temperature parameter in the case where the refrigerant system operating state is a normal state comprises: in the case where the refrigerant system operating state is a normal state, detecting a compressor operating state; in the case where the compressor operating state is a non-operating state, converting the compressor intake pressure value and the compressor intake state parameter into a saturated vapor temperature; displaying the saturated vapor temperature; in the case where the compressor operating state is an operating state, displaying the ambient temperature parameter.

[0023] In a second aspect of the present application, embodiments of the present application disclose a refrigerant system control device, comprising: a first obtaining module, configured to obtain an air intake amount, a compressor intake state parameter, a condenser target output parameter and a condenser feedback output parameter; a first closed loop module, configured to perform closed loop control according to the condenser target output parameter and the condenser feedback output parameter, to determine a compressor discharge state parameter; a determining module, configured to determine a condenser target heat exchange parameter according to the compressor discharge state parameter; a second closed loop module, configured to perform closed loop control according to the condenser target heat exchange parameter and the condenser feedback output parameter, to determine an ambient temperature parameter; an updating module configured to update the condenser target output parameter according to the ambient temperature parameter, the air intake amount and the compressor discharge state parameter; a control module configured to control the compressor based on the compressor discharge state parameter and control the condenser based on the updated condenser target output parameter.

[0024] In a third aspect of the present application, an embodiment of the present application discloses a vehicle comprising a processor, a memory, and a computer program stored in the memory and capable of running on the processor, wherein the computer program, when executed by the processor, implements the steps of the refrigerant system control method as described above.

[0025] In a fourth aspect of the present application, an embodiment of the present application discloses a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program, when executed by a processor, implements the steps of the refrigerant system control method as described above.

[0026] Advantages of the present application: Through two closed-loop control processes, the compressor discharge state parameter and the ambient temperature parameter can be calculated by using the air intake amount, the compressor intake state parameter, the condenser target output parameter and the condenser feedback output parameter, and then the refrigerant system is controlled. In the control process, the ambient temperature detected by the temperature sensor is not needed, and the ambient temperature parameter can be determined by virtual calculation to replace the original vehicle ambient temperature sensor, thereby reducing the material cost. Moreover, the virtual calculation method is not affected by the detection error caused by the deployment position of the original vehicle ambient temperature sensor, and can accurately reflect the ambient temperature and accurately control the refrigerant system, thereby improving the control accuracy of the refrigerant system. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A step flowchart of an embodiment of the refrigerant system control method of the present application; Figure 2 A step flowchart of another embodiment of the refrigerant system control method of the present application; Figure 3 A refrigerant system architecture diagram of the present application; Figure 4 A condenser heat exchange equivalent principle diagram of a refrigerant system of the present application; Figure 5 A running principle diagram of a condenser equivalent heat exchange model of a refrigerant system of the present application; Figure 6 A heat exchange parameter optimization example diagram of a condenser equivalent heat exchange model of a refrigerant system of the present application; Figure 7A schematic diagram of the reverse calibration principle of the air intake amount of the present application; Figure 8 A schematic diagram of the closed-loop control of a refrigerant system of the present application; Figure 9 A schematic diagram of the display data operation of a refrigerant system of the present application; Figure 10 A structure block diagram of a refrigerant system control embodiment of the present application; Figure 11 A structure block diagram of a vehicle embodiment of the present application; Figure 12 A structure block diagram of a computer readable storage medium embodiment of the present application. DETAILED DESCRIPTION

[0028] Other advantages and effects of the present application can be easily understood by those skilled in the art from the contents disclosed in the present specification. The present application can also be implemented or applied in other different specific embodiments, and the details in the present specification can be modified or changed in various ways based on different views and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, but not for limiting the protection scope of the present application.

[0029] It should be noted that the diagrams provided in the following embodiments only schematically illustrate the basic concept of the present application, and the diagrams only show the components related to the present application, but are not drawn according to the number, shape and size of the components in actual implementation. The type, number and ratio of the components in actual implementation can be arbitrarily changed, and the layout type of the components can be more complex.

[0030] Referring to Figure 1 , a step flow chart of a refrigerant system control method embodiment of the present application is shown, which can specifically include the following steps: Step 101, obtaining an air intake amount, a compressor intake state parameter, a condenser target output parameter and a condenser feedback output parameter; In the process of controlling the refrigerant system, the air intake amount, the compressor intake state parameter, the condenser target output parameter and the condenser feedback output parameter can be obtained. The air intake amount is the total air intake amount for cooling the refrigerant system in a control period when the vehicle uses the refrigerant system. The compressor intake state parameter represents various intake states of the intake port of the compressor in the refrigerant system, the condenser target output parameter represents the output state that the condenser in the refrigerant system is expected to achieve, and the condenser feedback output parameter represents the output state that the actual condenser in the refrigerant system can output when running.

[0031] Step 102, determining a compressor exhaust state parameter according to the closed-loop control of the condenser target output parameter and the condenser feedback output parameter; The condenser target output parameter and the condenser feedback output parameter are used for closed-loop control. The condenser target output parameter is used as a target parameter, and the condenser feedback output parameter is used as a feedback parameter for closed-loop control to determine the compressor exhaust state parameter. The compressor exhaust state parameter represents the output state of the compressor exhaust port. Since the gas discharged by the compressor can be transmitted to the condenser inlet through the pipeline between the compressor and the condenser, and the consumption of this process can be ignored, the compressor exhaust state parameter can also be used as the intake state parameter of the condenser inlet.

[0032] Step 103, determining a condenser target heat exchange parameter according to the compressor exhaust state parameter; The compressor exhaust state parameter can be used to determine the heat exchange condition that the condenser can achieve, and the corresponding condenser target heat exchange parameter is determined. The condenser target heat exchange parameter represents the heat exchange state that the condenser in the refrigerant system is expected to achieve.

[0033] Step 104, determining an environment temperature parameter according to the closed-loop control of the condenser target heat exchange parameter and the condenser feedback output parameter; The condenser target heat exchange parameter and the condenser feedback output parameter are used for closed-loop control. The condenser target heat exchange parameter is used as a target parameter, and the condenser feedback output parameter is used as a feedback parameter for closed-loop control to determine the environment temperature parameter. The environment temperature parameter is used to ensure the environment temperature of the environment in which the refrigerant system is located.

[0034] Step 105, updating the condenser target output parameter according to the environment temperature parameter, the air intake amount, and the compressor exhaust state parameter; The environment temperature parameter, the air intake amount, and the compressor exhaust state parameter are combined to calculate the operating state of the condenser, determine the output state that the condenser can achieve, and update the condenser target output parameter. The condenser target output parameter is used to control the condenser.

[0035] Step 106, controlling the condenser based on the updated condenser target output parameter.

[0036] The compressor exhaust state parameter is used to control the operation of the compressor. The updated condenser target output parameter is used to control the operation of the condenser.

[0037] This invention embodiment acquires the intake air volume, compressor intake state parameters, condenser target output parameters, and condenser feedback output parameters; performs closed-loop control based on the condenser target output parameters and the condenser feedback output parameters to determine the compressor exhaust state parameters; determines the condenser target heat exchange parameters based on the compressor exhaust state parameters; performs closed-loop control based on the condenser target heat exchange parameters and the condenser feedback output parameters to determine the ambient temperature parameters; updates the condenser target output parameters based on the ambient temperature parameters, the intake air volume, and the compressor exhaust state parameters; and controls the compressor based on the compressor exhaust state parameters and controls the condenser based on the updated condenser target output parameters. Through two closed-loop control processes, the compressor exhaust parameters and ambient temperature parameters can be calculated using the air intake volume, compressor intake state parameters, condenser target output parameters, and condenser feedback output parameters. This allows for the control of the refrigerant system. The control process eliminates the need for ambient temperature sensors; instead, virtual calculations determine the ambient temperature parameters, replacing the original vehicle ambient temperature sensor and reducing material costs. Furthermore, since virtual calculations are not affected by detection errors caused by the original vehicle ambient temperature sensor's location, they accurately reflect the ambient temperature, enabling precise control of the refrigerant system and improving its control accuracy.

[0038] Reference Figure 2 The diagram illustrates a flowchart of another embodiment of the refrigerant system control method of the present invention, which specifically includes the following steps: Step 201: Obtain compressor performance parameters; The refrigerant system structure described in the embodiments of the present invention can be referred to... Figure 3 It can include an air-cooled condenser and a compressor, and can also be equipped with a pressure sensor at the outlet of the air-cooled condenser and a pressure sensor at the inlet of the compressor. If there is no temperature sensor at the compressor inlet (i.e., for detecting...),... Figure 3 The intake air temperature sensor (T_suction) can be set to the current intake air pressure saturation temperature + 5℃ (i.e., superheat of 5℃) by default. If there is no temperature sensor at the condenser outlet (i.e., the temperature sensor that detects the condenser outlet temperature T_out), it is necessary to pre-measure the actual operating state of the system condenser and the condenser outlet temperature it can condense to, and then set the subcooling to maintain 0~5℃.

[0039] Compressor performance parameters can be obtained from the compressor's technical manual or relevant databases. These parameters are inherent to the compressor itself and can be obtained through performance testing. Examples include the compressor's isentropic efficiency and isochoric efficiency.

[0040] Step 202, constructing a compressor model based on the compressor performance parameters; The performance of the compressor model can be identified by the compressor performance parameters, and an equivalent mathematical model is constructed, that is, the compressor model is obtained. The compressor model is an equivalent mathematical model of the operation of the physical compressor.

[0041] In an optional embodiment of the present application, the step of constructing a compressor model based on the compressor performance parameters comprises: determining the refrigerant type based on the compressor performance parameters; and constructing a compressor model based on the refrigerant parameters corresponding to the refrigerant type and the compressor performance parameters.

[0042] The displacement of the compressor can be identified by the compressor performance parameters, and the refrigerant type used by the refrigerant system can be determined, and the required refrigerant model can be selected. The corresponding refrigerant parameter calculation model is determined by the refrigerant type, and the refrigerant parameter calculation model can be used to calculate the refrigerant density, the refrigerant enthalpy, and the saturation pressure temperature curve for saturation temperature calculation pressure or pressure calculation temperature. The refrigerant parameter calculation model can be calculated by a formula model algorithm such as Peng-Robinson (algorithm), Martin Hou, etc. through known refrigerant parameter query determination formula coefficient; (2) A table is constructed directly by known refrigerant performance data, and the refrigerant parameter calculation model is calculated by table lookup. Based on the refrigerant parameter calculation model and the compressor performance parameters as the state during operation, a compressor model is constructed.

[0043] Specifically, the compressor model is characterized by a mass flow rate relationship and a compressor discharge temperature relationship, and the step of constructing a compressor model based on the refrigerant parameters corresponding to the refrigerant type and the compressor performance parameters comprises: determining the mass flow rate relationship based on the compressor performance parameters; and determining the compressor discharge temperature relationship based on the refrigerant parameters corresponding to the refrigerant type and the compressor performance parameters.

[0044] The compressor model can be characterized by two formulas, a mass flow rate relationship and a compressor discharge temperature relationship. The mass flow rate relationship is the ability of the compressor output mass flow rate. The compressor discharge temperature relationship is the discharge temperature at the compressor discharge. The operating state of the compressor can be fitted and determined by the mass flow rate relationship by using the structure and operating performance parameters in the compressor performance parameters. For example, the mass flow rate output by the compressor per unit time can be determined based on the isochoric efficiency of the compressor, the rotational speed of the compressor, and the displacement of the compressor. The expression of the relationship is:

[0045] wherein dm is the calculated mass flow rate of the compressor; is the inlet pressure value; The isentropic efficiency of the compressor is obtained by compressor parameter calculation, and the isentropic efficiency of the compressor at different pressure ratios and rotational speeds is obtained.

[0046] The refrigerant parameters corresponding to the refrigerant type and the compressor performance parameters can be used to fit and determine the compressor exhaust temperature relationship when the compressor operates on the refrigerant medium. For example, the compressor exhaust temperature relationship can be constructed based on the isentropic enthalpy value, suction enthalpy value and compressor isentropic efficiency. The exhaust temperature can be represented by the exhaust enthalpy value, and the expression of the relationship is:

[0047] Among them: is the isentropic enthalpy value; is the suction enthalpy value; is the exhaust enthalpy value; The isentropic efficiency of the compressor is obtained by compressor parameter calculation, and the isentropic efficiency of the compressor at different pressure ratios and rotational speeds is obtained.

[0048] After determining the exhaust enthalpy value, the mass flow rate of the compressor output can be connected, and the current exhaust temperature can be calculated based on the pre-determined refrigerant property parameter table. The refrigerant property parameter table records the physical characteristic parameters of the refrigerant, which can be obtained by pre-experimenting the refrigerant.

[0049] Step 203, obtaining the condenser size parameter; The condenser size parameter can be obtained from the technical manual of the condenser or the related database. The condenser size parameter is the inherent size parameter of the condenser, which can be obtained by measuring the condenser. For example, the characteristic heat exchange length of the air side of the condenser, the outside windward area, the cross-sectional area, the convective heat transfer area and the air side volume. The characteristic heat exchange length of the refrigerant side of the condenser, the cross-sectional area, the convective heat transfer area, the refrigerant volume and the mass of the air-cooled condenser.

[0050] Step 204, constructing a condenser equivalent heat exchange model based on the condenser size parameter; The condenser equivalent heat exchange model can be fitted and determined by fitting the heat exchange state of the condenser based on the condenser size parameter. By constructing the condenser equivalent heat exchange model, the operating state of the condenser can be fitted, so that the operating state of the condenser can be quantified, the data of the sensor can be cross-verified, or the output state can be fitted to reduce the detection error.

[0051] In an optional embodiment of the present application, the step of constructing the condenser equivalent heat exchange model based on the condenser size parameters comprises: constructing a gaseous refrigerant heat exchange region, a two-phase refrigerant heat exchange region and a liquid refrigerant heat exchange region based on the condenser size parameters; determining a heat exchange relationship of the gaseous refrigerant heat exchange region, a heat exchange relationship of the two-phase refrigerant heat exchange region and a heat exchange relationship of the liquid refrigerant heat exchange region; and combining the heat exchange relationship of the gaseous refrigerant heat exchange region, the heat exchange relationship of the two-phase refrigerant heat exchange region and the heat exchange relationship of the liquid refrigerant heat exchange region as the condenser equivalent heat exchange model.

[0052] Reference can be made to Figure 4 The condenser can be calculated by simplifying the physical structure into the refrigerant heat exchange temperature, the refrigerant heat exchange thermal resistance, the body temperature, the body heat exchange thermal resistance, the air heat exchange temperature and the air heat exchange thermal resistance in the equivalent heat exchange process. Therefore, the input of the condenser equivalent heat exchange model can be defined as the mass flow rate of the refrigerant inlet, the temperature of the refrigerant inlet, the pressure of the refrigerant inlet, the mass flow rate of the inlet air, the temperature of the inlet air and the humidity of the inlet air, and the output is defined as the temperature of the outlet refrigerant, the pressure of the outlet refrigerant and the heat exchange power of the condenser.

[0053] Based on this, the condenser can be divided into a gaseous refrigerant heat exchange region, a two-phase refrigerant heat exchange region and a liquid refrigerant heat exchange region based on the condenser size parameters. The gaseous refrigerant heat exchange region is a region for heat exchange of gaseous refrigerant medium. The two-phase refrigerant heat exchange region is a region for heat exchange of gaseous and liquid refrigerant medium. The liquid refrigerant heat exchange region is a region for heat exchange of liquid refrigerant medium.

[0054] The heat exchange relationship of each refrigerant heat exchange region during cooling is fitted respectively, that is, the heat exchange relationship of the gaseous refrigerant heat exchange region, the heat exchange relationship of the two-phase refrigerant heat exchange region and the heat exchange relationship of the liquid refrigerant heat exchange region are fitted and determined. The heat exchange relationship of the gaseous refrigerant heat exchange region, the heat exchange relationship of the two-phase refrigerant heat exchange region and the heat exchange relationship of the liquid refrigerant heat exchange region are combined as the condenser equivalent heat exchange model.

[0055] Specifically, the step of determining the heat transfer relationship of the gaseous refrigerant heat transfer region, the two-phase refrigerant heat transfer region and the liquid refrigerant heat transfer region comprises: determining a heat transfer coefficient; determining the heat transfer relationship of the gaseous refrigerant heat transfer region based on a preset convective heat transfer formula, in combination with the heat transfer area of the gaseous refrigerant heat transfer region and the heat transfer coefficient; determining the heat transfer relationship of the two-phase refrigerant heat transfer region based on the preset convective heat transfer formula, in combination with the heat transfer area of the two-phase refrigerant heat transfer region and the heat transfer coefficient; and determining the heat transfer relationship of the liquid refrigerant heat transfer region based on the preset convective heat transfer formula, in combination with the heat transfer area of the liquid refrigerant heat transfer region and the heat transfer coefficient.

[0056] Due to different use scenarios, different heat transfer coefficients are used. The heat transfer coefficient of the condenser can be determined according to the use scenario of the vehicle, including but not limited to Reynolds number, Prandtl number, Grashof number, heat transfer Nusselt number, etc. Among them, it can include forced heat transfer Nusselt number, free Nusselt number, etc., as follows:

[0057] After determining the heat transfer parameters, a preset convective heat transfer formula, such as Newton's cooling law formula, can be used. The heat transfer area and heat transfer coefficient of each refrigerant heat transfer region are substituted to determine the corresponding heat transfer relationship. Based on the preset convective heat transfer formula, the heat transfer area and heat transfer coefficient of the gaseous refrigerant heat transfer region are substituted to determine the heat transfer relationship of the gaseous refrigerant heat transfer region. Based on the preset convective heat transfer formula, the heat transfer area and heat transfer coefficient of the two-phase refrigerant heat transfer region are substituted to determine the heat transfer relationship of the two-phase refrigerant heat transfer region. Based on the preset convective heat transfer formula, the heat transfer area and heat transfer coefficient of the liquid refrigerant heat transfer region are substituted to determine the heat transfer relationship of the liquid refrigerant heat transfer region. Based on this, the operating principle of the equivalent heat transfer model of the condenser can be referred to Figure 5 Based on the output of the compressor, the refrigerant medium state, the heat transfer through the gaseous refrigerant heat transfer region, the two-phase refrigerant heat transfer region and the liquid refrigerant heat transfer region, and the calculation of the heat transfer amount of each region in the gaseous refrigerant heat transfer region, the two-phase refrigerant heat transfer region and the liquid refrigerant heat transfer region, and the output state, the total heat transfer amount and the actual heat transfer amount are determined based on the heat transfer amount of each region. The output state of each region can be used as the input of the next region to continue determining the heat transfer amount, thereby completing the heat transfer treatment of the entire condenser.

[0058] In addition, the step of determining the heat transfer relationship of the gaseous refrigerant heat transfer region, the two-phase refrigerant heat transfer region and the liquid refrigerant heat transfer region further comprises: updating the heat transfer coefficient based on the difference between the updated condenser target heat transfer parameter and the condenser feedback output parameter.

[0059] The updated condenser target heat exchange parameter and the condenser feedback output parameter in the actual application can be subtracted, and the difference is used as a feedback gradient value to continuously optimize the heat exchange coefficient, thereby improving the accuracy of the heat exchange relationship, and further reducing the error in the calculation process. For example, refer to Figure 6 For example, an intelligent agent (neural network) can be established based on reinforcement learning, the optimization target is set as the adjustable coefficients a1 and a2 of the air-side Nusselt number calculation, the difference between the updated condenser target heat exchange parameter and the condenser feedback output parameter in the actual application is subtracted, and the minimum difference is used as a reward function to perform optimization, thereby determining a more optimal heat exchange coefficient. Then, the new heat exchange coefficient is replaced in the original heat exchange relationship, thereby continuously reducing the error and improving the accuracy.

[0060] In step 205, the air intake amount, the compressor intake state parameter, the condenser target output parameter, and the condenser feedback output parameter are obtained. The air intake amount, the compressor intake state parameter, the condenser target output parameter, and the condenser feedback output parameter are obtained through sensors or historical databases.

[0061] The air intake amount can be obtained in two ways. The first way is to obtain the actual air intake amount through forward measurement, that is, to detect the air intake amount. The second way is to determine it through reverse calibration, using the actual calculated environmental temperature parameter and the compressor intake state parameter. The step of obtaining the air intake amount includes: performing reverse calibration based on the environmental temperature parameter and the compressor intake state parameter to determine the air intake amount. By using reverse calibration, the number of sensors of the vehicle can be further reduced, and the function of a virtual sensor can be realized.

[0062] In an optional embodiment of the present application, the step of performing reverse calibration based on the environmental temperature parameter and the compressor intake state parameter to determine the air intake amount includes: determining the vehicle speed based on the environmental temperature parameter and the compressor intake state parameter; and determining the air intake amount based on the vehicle speed.

[0063] The calculated environmental temperature parameter and the detected compressor intake state parameter can be used as a target for closed-loop control to determine the vehicle speed. Then, the corresponding air intake amount is determined by looking up the table based on the relationship between the vehicle speed and the air intake amount. The relationship between the vehicle speed and the air intake amount can be determined based on experiments in advance.

[0064] The principle of reverse calibration can be referred to Figure 7The first closed loop (outer loop) PI (proportional integral) calculation: the difference between the calculated value of the outlet pressure of the condenser and the collected value of the outlet pressure of the condenser is used to adjust the calculation of the discharge pressure of the compressor. The calculated discharge pressure, and the suction pressure, suction temperature, and speed of the compressor in the collected state parameters of the intake of the compressor are used to calculate the pressure, temperature, and mass flow of the inlet of the condenser through the compressor mass flow relationship and the compressor discharge temperature relationship. The second closed loop (inner loop) PI calculation: the difference between the calculated heat transfer amount Qtotal and the actual heat transfer amount is used for PI control calculation of the inlet air volume. The actual heat transfer amount is calculated by the measured outlet pressure and temperature of the condenser to calculate the outlet enthalpy value, by the calculated discharge pressure and temperature of the compressor to calculate the inlet enthalpy value, and by the enthalpy difference multiplied by the mass flow to calculate the heat transfer amount. When the inlet temperature is known, the difference between the heat transfer amount is used to adjust the inlet air volume, and the corresponding inlet air volume is determined in the inlet air volume table calibrated at the vehicle speed.

[0065] Step 206: determining the compressor intake pressure value according to the closed loop control of the condenser target output parameter and the condenser feedback output parameter; For the control process of the refrigerant system, the difference between the condenser target output parameter and the condenser feedback output parameter can be used for closed loop control to determine the compressor intake pressure value. The closed loop control method includes but is not limited to PID (proportional integral derivative), PI (proportional integral) control. Among them, the compressor intake pressure value represents the intake pressure value of the intake port of the compressor in the refrigerant system.

[0066] In an example, the condenser target output parameter includes a condenser target output pressure value, the condenser feedback output parameter includes a condenser feedback output pressure value, and the step of determining the compressor intake pressure value according to the closed loop control of the condenser target output parameter and the condenser feedback output parameter includes: determining the pressure difference value of the condenser target output pressure value and the condenser feedback output pressure value; and determining the compressor intake pressure value based on the closed loop control of the pressure difference value and the condenser feedback output pressure value.

[0067] The condenser target output parameter includes a condenser target output pressure value. The condenser target output pressure value is the required output discharge pressure of the condenser. The condenser feedback output parameter includes a condenser feedback output pressure value, and the condenser feedback output pressure value is the actual discharge pressure of the condenser. The difference between the condenser target output pressure value and the condenser feedback output pressure value, i.e. the pressure difference value, can be calculated. The pressure difference value and the condenser feedback output pressure value are used for closed loop control calculation, such as PID, PI, etc. to determine the corresponding control value, and then adjust the compressor intake pressure value.

[0068] Step 207, determining a compressor discharge state parameter according to the compressor suction pressure value and the compressor suction state parameter; Based on the compressor suction pressure value and the compressor suction state parameter, the output parameter of the compressor can be determined, and the compressor discharge state parameter of the compressor output can be fitted.

[0069] In an example, the step of determining the compressor discharge state parameter according to the compressor suction pressure value and the compressor suction state parameter includes: determining the compressor discharge state parameter according to the compressor suction pressure value and the compressor suction state parameter based on the compressor model.

[0070] The compressor suction pressure value and the compressor suction state parameter can be substituted into the compressor model to fit the compressor discharge state parameter. Through the compressor model, the compressor discharge state parameter can be determined based on the collected data, so that the running state of the compressor can be accurately fitted, the input of the condenser can be quantified, and the function of the virtual sensor can be realized.

[0071] In an example, the compressor suction state parameter includes a compressor speed and a compressor suction temperature; the step of determining the compressor discharge state parameter according to the compressor suction pressure value and the compressor suction state parameter based on the compressor model includes: substituting the compressor suction pressure value, the compressor speed and the compressor suction temperature into the compressor model to determine a compressor output mass flow and a discharge enthalpy value; performing table lookup on a preset refrigerant property parameter table based on the discharge enthalpy value to determine a compressor discharge temperature value; determining the compressor discharge temperature value and the compressor output mass flow as the compressor discharge state parameter.

[0072] The compressor suction pressure value, the compressor speed and the compressor suction temperature can be substituted into the mass flow relationship in the compressor model to calculate the compressor output mass flow; the discharge enthalpy value can be calculated in the compressor discharge temperature relationship substituted into the compressor model, the compressor discharge temperature value corresponding to the discharge enthalpy value can be determined by performing table lookup on the preset refrigerant property parameter table based on the discharge enthalpy value. The compressor discharge temperature value and the compressor output mass flow are taken as the compressor discharge state parameter. The preset refrigerant property parameter table can be determined in advance based on the type of refrigerant.

[0073] Step 208, determining a condenser target heat exchange parameter according to the compressor discharge state parameter; Based on the compressor discharge state parameter, the input state of the condenser can be determined, the heat exchange state that can be realized based on the input state can be determined, and the condenser target heat exchange parameter can be determined.

[0074] In an example of the present application, the step of determining the condenser target heat exchange parameter according to the compressor discharge state parameter comprises: converting the compressor output mass flow and the compressor discharge temperature value into a condenser target heat exchange amount based on a preset heat exchange strategy; and determining the condenser target heat exchange amount as the condenser target heat exchange parameter.

[0075] The corresponding preset heat exchange strategy can be determined based on the current working condition of the vehicle. The preset heat exchange strategy is determined based on a pre-set vehicle control strategy. The compressor output mass flow and the compressor discharge temperature value are converted into the condenser target heat exchange amount based on the conversion relationship in the preset heat exchange strategy.

[0076] In step 209, the environment temperature parameter is determined according to the closed-loop control of the condenser target heat exchange parameter and the condenser feedback output parameter. Then, the environment temperature parameter is identified based on the closed-loop control of the condenser target heat exchange parameter and the condenser feedback output parameter.

[0077] In an optional embodiment of the present application, the condenser feedback output parameter comprises a condenser feedback heat exchange amount, and the step of determining the environment temperature parameter according to the closed-loop control of the condenser target heat exchange parameter and the condenser feedback output parameter comprises: determining a heat difference value of the condenser target heat exchange amount and the condenser feedback heat exchange amount; and determining the environment temperature parameter based on the closed-loop control of the heat difference value and the condenser feedback heat exchange amount.

[0078] The difference value between the condenser target heat exchange amount and the condenser feedback heat exchange amount, i.e., the heat difference value, can be calculated, and the heat difference value and the condenser feedback heat exchange amount are used as inputs for the closed-loop control to determine the corresponding environment temperature parameter.

[0079] In step 210, the condenser target output parameter is updated according to the environment temperature parameter, the air inlet amount, and the compressor discharge state parameter. The corresponding control amount can be determined based on the environment temperature parameter, the air inlet amount, and the compressor discharge state parameter to fit the operating condition of the condenser, and the updated condenser target output parameter is obtained.

[0080] In an optional embodiment of the present application, the step of updating the condenser target output parameter according to the environment temperature parameter, the air inlet amount, and the compressor discharge state parameter comprises: converting the environment temperature parameter, the air inlet amount, and the compressor discharge state parameter into target update parameters based on the equivalent heat exchange model of the condenser; and updating the condenser target output parameter by using the target update parameters.

[0081] The environment temperature parameter, the air intake amount and the compressor exhaust state parameter can be converted into target update parameters based on heat exchange relationships of three heat exchange regions in the condenser equivalent heat exchange model. The target update parameters are used to update the target output parameters of the condenser.

[0082] Specifically, the step of converting the environment temperature parameter, the air intake amount and the compressor exhaust state parameter into target update parameters based on the condenser equivalent heat exchange model comprises: converting the environment temperature parameter, the air intake amount and the compressor exhaust state parameter into gaseous refrigerant heat exchange region output parameters based on the heat exchange relationship of the gaseous refrigerant heat exchange region; the gaseous refrigerant heat exchange region output parameters comprise gaseous refrigerant heat exchange region heat exchange amount and gaseous refrigerant heat exchange region output state amount; converting the environment temperature parameter, the air intake amount and the gaseous refrigerant heat exchange region output state amount into two-phase refrigerant heat exchange region output parameters based on the heat exchange relationship of the two-phase refrigerant heat exchange region; the two-phase refrigerant heat exchange region output parameters comprise two-phase refrigerant heat exchange region heat exchange amount and two-phase refrigerant heat exchange region output state amount; converting the environment temperature parameter, the air intake amount and the two-phase refrigerant heat exchange region output state amount into liquid refrigerant heat exchange region output parameters based on the heat exchange relationship of the liquid refrigerant heat exchange region; the liquid refrigerant heat exchange region output parameters comprise liquid refrigerant heat exchange region heat exchange amount and liquid refrigerant heat exchange region output state amount; determining the total condenser heat exchange amount by combining the gaseous refrigerant heat exchange region heat exchange amount, the two-phase refrigerant heat exchange region heat exchange amount and the liquid refrigerant heat exchange region heat exchange amount; and determining the total condenser heat exchange amount as the target update parameter.

[0083] The environment temperature parameter, the air intake amount and the compressor exhaust state parameter can be converted into target update parameters based on heat exchange relationships of three heat exchange regions in the condenser equivalent heat exchange model. The target update parameters are used to update the target output parameters of the condenser.

[0084] In summary, for the above-mentioned double closed-loop control can refer to Figure 8 The first closed-loop (outer loop) PI calculation: the condenser outlet pressure calculation value and the condenser outlet pressure acquisition value difference PI adjustment calculation compressor discharge pressure. By calculating the discharge pressure and the acquisition of the compressor suction pressure, compressor suction temperature, compressor speed into the compressor mass flow relationship, the compressor discharge pressure, temperature, mass flow and calculated as the condenser inlet pressure, temperature, mass flow.

[0085] The second closed-loop (inner loop) PI calculation: the calculated heat transfer Q total and the actual heat transfer difference PI control calculation inlet air temperature. Actual heat transfer calculation: through the actual measurement of the outlet pressure, temperature calculation outlet enthalpy, through the calculated compressor discharge pressure and temperature calculation inlet enthalpy, and then through the enthalpy difference multiplied by the mass flow calculation heat transfer. Through the difference value PI adjustment inlet temperature.

[0086] Step 211, based on the compressor discharge state parameter control compressor and updated condenser target output parameter control condenser; The compressor is controlled by the compressor discharge state parameter to realize the corresponding motion state. The condenser is controlled by the updated condenser target output parameter to realize the corresponding heat transfer function and cool the refrigerant medium.

[0087] Step 212, determine the refrigerant system running state; The refrigerant system running state can be identified by detecting the transmission of the signal, fault identification state, etc.

[0088] Step 213, in the case of the refrigerant system running state being a fault state, display the preset environment temperature; In the case of the refrigerant system running state being a fault state, it means that the current refrigerant system is faulty, and the preset environment temperature is directly displayed.

[0089] Step 214, in the case of the refrigerant system running state being a normal state, display the environment temperature parameter.

[0090] In the case of the refrigerant system running state being a normal state, that is, the refrigerant system can operate normally, the related environment temperature parameter is displayed.

[0091] Specifically, the step of displaying the ambient temperature parameter when the refrigerant system operating state is normal state comprises: detecting the compressor working state when the refrigerant system operating state is normal state; converting the compressor suction pressure value and the compressor suction state parameter into saturated vapor temperature when the compressor working state is non-working state; displaying the saturated vapor temperature; displaying the ambient temperature parameter when the compressor working state is working state.

[0092] When the refrigerant system operating state is normal state, the compressor working state of the compressor is further detected. When the compressor working state is non-working state, i.e. the compressor is not working, the vehicle external temperature cannot be determined based on the operating state of the compressor, but can be converted into saturated vapor temperature based on the historical compressor suction pressure value and the compressor suction state parameter, and the saturated vapor temperature is displayed. When the compressor working state is working state, the compressor working can detect the ambient temperature parameter based on the above control process, and the calculated ambient temperature parameter can be displayed.

[0093] For example, reference can be made to Figure 9 When the fault state enters the fault mode, the external temperature is displayed according to the fault preset temperature. When the non-fault state, the compressor is not working and the high and low pressure pressures are balanced, the external temperature value is the saturated temperature of the high pressure pressure plus a calibration value, and when the compressor is working in other states, the external temperature is calculated by using the above double closed loop control calculation method.

[0094] The embodiment of the present application acquires compressor performance parameters, constructs a compressor model based on the compressor performance parameters, acquires condenser size parameters, constructs a condenser equivalent heat exchange model based on the condenser size parameters, acquires an air intake amount, compressor air intake state parameters, condenser target output parameters, and condenser feedback output parameters, performs closed-loop control according to the condenser target output parameters and the condenser feedback output parameters to determine a compressor air intake pressure value, determines compressor exhaust state parameters according to the compressor air intake pressure value and the compressor air intake state parameters, determines condenser target heat exchange parameters according to the compressor exhaust state parameters, performs closed-loop control according to the condenser target heat exchange parameters and the condenser feedback output parameters to determine an ambient temperature parameter, updates the condenser target output parameters according to the ambient temperature parameter, the air intake amount, and the compressor exhaust state parameters, controls the compressor based on the compressor exhaust state parameters and the updated condenser target output parameters, determines a refrigerant system operating state, displays a preset ambient temperature when the refrigerant system operating state is a fault state, and displays the ambient temperature parameter when the refrigerant system operating state is a normal state. By constructing a condenser model and a compressor model, the output state parameters and the heat exchange amount of the condenser are calculated based on the equivalent model, the ambient temperature parameter and the exhaust state parameters such as the compressor exhaust pressure value and the exhaust temperature value are calculated in a closed loop by measuring the pressure and the equivalent heat exchange amount. Then, the refrigerant system is controlled based on these parameters, and in the control process, the ambient temperature can be determined by virtual calculation instead of the original vehicle ambient temperature sensor, thereby reducing the material cost. Moreover, the virtual calculation method is not affected by the detection error caused by the deployment position of the original vehicle ambient temperature sensor, and can accurately reflect the ambient temperature and accurately control the refrigerant system, thereby improving the control accuracy of the refrigerant system.

[0095] It should be noted that, for the method embodiments, in order to simply describe, they are all described as a series of action combinations, but those skilled in the art should know that the embodiments of the present application are not limited by the action order described, because according to the embodiments of the present application, certain steps can be performed in other order or at the same time. Secondly, those skilled in the art should know that the embodiments described in the specification all belong to preferred embodiments, and the actions involved are not necessarily necessary for the embodiments of the present application.

[0096] Reference Figure 10 , a structural block diagram of an embodiment of a refrigerant system control device of the present application is shown, which specifically includes the following component modules: The first acquisition module 1001 is configured to acquire an air intake amount, compressor air intake state parameters, condenser target output parameters, and condenser feedback output parameters. a first closed-loop module 1002 configured to determine a compressor discharge state parameter according to the condenser target output parameter and the condenser feedback output parameter; a determination module 1003 configured to determine a condenser target heat exchange parameter according to the compressor discharge state parameter; a second closed-loop module 1004 configured to determine an ambient temperature parameter according to the condenser target heat exchange parameter and the condenser feedback output parameter; an update module 1005 configured to update the condenser target output parameter according to the ambient temperature parameter, the air intake amount, and the compressor discharge state parameter; a second control module 1006 configured to control the compressor based on the compressor discharge state parameter and control the condenser based on the updated condenser target output parameter.

[0097] In an optional embodiment of the present application, the first closed-loop module 1002 includes: an outer closed-loop submodule configured to determine a compressor intake pressure value according to the condenser target output parameter and the condenser feedback output parameter; a compressor discharge determination submodule configured to determine a compressor discharge state parameter according to the compressor intake pressure value and the compressor intake state parameter.

[0098] In an optional embodiment of the present application, the condenser target output parameter includes a condenser target output pressure value, the condenser feedback output parameter includes a condenser feedback output pressure value, and the outer closed-loop submodule includes: a pressure difference value determination unit configured to determine a pressure difference value between the condenser target output pressure value and the condenser feedback output pressure value; a compressor intake pressure value determination unit configured to determine a compressor intake pressure value based on closed-loop control of the pressure difference value and the condenser feedback output pressure value.

[0099] In an optional embodiment of the present application, the device further includes: a second acquisition module configured to acquire a compressor performance parameter; a first construction module configured to construct a compressor model based on the compressor performance parameter; The compressor discharge determination submodule includes: a compressor discharge state parameter determination unit configured to determine a compressor discharge state parameter according to the compressor intake pressure value and the compressor intake state parameter based on the compressor model.

[0100] In an optional embodiment of the present application, the compressor intake state parameter comprises compressor rotation speed and compressor suction temperature; the compressor discharge state parameter determination unit comprises: A compressor output determination subunit is configured to substitute the compressor intake pressure value, the compressor rotation speed and the compressor suction temperature into the compressor model to determine compressor output mass flow and discharge enthalpy value. A first lookup table subunit is configured to perform lookup table operation on a preset refrigerant property parameter table based on the discharge enthalpy value to determine compressor discharge temperature value. A compressor discharge state parameter determination subunit is configured to determine the compressor discharge temperature value and the compressor output mass flow as compressor discharge state parameters.

[0101] In an optional embodiment of the present application, the first construction module comprises: A refrigerant type determination sub-module is configured to determine refrigerant type based on the compressor performance parameter. A first construction sub-module is configured to construct a compressor model based on refrigerant parameters corresponding to the refrigerant type and compressor performance parameters.

[0102] In an optional embodiment of the present application, the compressor model is characterized by a mass flow relationship and a compressor discharge temperature relationship, and the first construction sub-module comprises: A mass flow relationship determination unit is configured to determine the mass flow relationship based on the compressor performance parameter. A first construction unit is configured to determine the compressor discharge temperature relationship based on refrigerant parameters corresponding to the refrigerant type and compressor performance parameters.

[0103] In an optional embodiment of the present application, the determination module 1003 comprises: A condenser target heat exchange amount determination subunit is configured to convert the compressor output mass flow and the compressor discharge temperature value into condenser target heat exchange amount based on a preset heat exchange strategy. A condenser target heat exchange parameter determination sub-module is configured to determine the condenser target heat exchange amount as condenser target heat exchange parameter.

[0104] In an optional embodiment of the present application, the condenser feedback output parameter comprises condenser feedback heat exchange amount, and the second closed-loop module 1004 comprises: A heat difference determination sub-module is configured to determine heat difference value of the condenser target heat exchange amount and the condenser feedback heat exchange amount. A second closed-loop sub-module is configured to perform closed-loop control based on the heat difference value and condenser feedback heat exchange amount to determine environmental temperature parameter.

[0105] In an optional embodiment of the present application, the device further comprises: a third obtaining sub-module, configured to obtain a condenser size parameter; a second constructing sub-module, configured to construct a condenser equivalent heat exchange model based on the condenser size parameter; The update module 1005 comprises: a target update parameter determining sub-module, configured to convert the environmental temperature parameter, the air inlet volume and the compressor exhaust state parameter into target update parameters based on the condenser equivalent heat exchange model; a condenser target output parameter updating sub-module, configured to update the condenser target output parameter by using the target update parameters.

[0106] In an optional embodiment of the present application, the second constructing sub-module comprises: a dividing unit, configured to construct a gaseous refrigerant heat exchange region, a two-phase refrigerant heat exchange region and a liquid refrigerant heat exchange region based on the condenser size parameter; a region relationship formula determining unit, configured to determine a heat exchange relationship formula of the gaseous refrigerant heat exchange region, a heat exchange relationship formula of the two-phase refrigerant heat exchange region and a heat exchange relationship formula of the liquid refrigerant heat exchange region; a constructing unit, configured to combine the heat exchange relationship formula of the gaseous refrigerant heat exchange region, the heat exchange relationship formula of the two-phase refrigerant heat exchange region and the heat exchange relationship formula of the liquid refrigerant heat exchange region to construct the condenser equivalent heat exchange model.

[0107] In an optional embodiment of the present application, the region relationship formula determining unit comprises: a heat exchange coefficient determining sub-unit, configured to determine a heat exchange coefficient; a gaseous refrigerant heat exchange region heat exchange relationship formula determining sub-unit, configured to determine the heat exchange relationship formula of the gaseous refrigerant heat exchange region based on a preset convective-conductive heat exchange formula, in combination with a heat exchange area of the gaseous refrigerant heat exchange region and the heat exchange coefficient; a two-phase refrigerant heat exchange region heat exchange relationship formula determining sub-unit, configured to determine the heat exchange relationship formula of the two-phase refrigerant heat exchange region based on a preset convective-conductive heat exchange formula, in combination with a heat exchange area of the two-phase refrigerant heat exchange region and the heat exchange coefficient; a liquid refrigerant heat exchange region heat exchange relationship formula determining sub-unit, configured to determine the heat exchange relationship formula of the liquid refrigerant heat exchange region based on a preset convective-conductive heat exchange formula, in combination with a heat exchange area of the liquid refrigerant heat exchange region and the heat exchange coefficient.

[0108] In an optional embodiment of the present application, the region relationship formula determining unit comprises: The optimization subunit is configured to update the heat exchange coefficient based on a difference between the updated condenser target heat exchange parameter and the condenser feedback output parameter.

[0109] In an optional embodiment of the present application, the target update parameter determination sub-module comprises: The gaseous refrigerant heat exchange unit is configured to convert the ambient temperature parameter, the air intake volume, and the compressor discharge state parameter into gaseous refrigerant heat exchange region output parameters based on a heat exchange relationship of the gaseous refrigerant heat exchange region; the gaseous refrigerant heat exchange region output parameters comprise a gaseous refrigerant heat exchange region heat exchange amount and a gaseous refrigerant heat exchange region output state amount. The two-phase refrigerant heat exchange unit is configured to convert the ambient temperature parameter, the air intake volume, and the gaseous refrigerant heat exchange region output state amount into two-phase refrigerant heat exchange region output parameters based on a heat exchange relationship of the two-phase refrigerant heat exchange region; the two-phase refrigerant heat exchange region output parameters comprise a two-phase refrigerant heat exchange region heat exchange amount and a two-phase refrigerant heat exchange region output state amount. The liquid refrigerant heat exchange unit is configured to convert the ambient temperature parameter, the air intake volume, and the two-phase refrigerant heat exchange region output state amount into liquid refrigerant heat exchange region output parameters based on a heat exchange relationship of the liquid refrigerant heat exchange region; the liquid refrigerant heat exchange region output parameters comprise a liquid refrigerant heat exchange region heat exchange amount and a liquid refrigerant heat exchange region output state amount. The condenser total heat exchange amount determination unit is configured to determine a condenser total heat exchange amount based on the gaseous refrigerant heat exchange region heat exchange amount, the two-phase refrigerant heat exchange region heat exchange amount, and the liquid refrigerant heat exchange region heat exchange amount. The target update parameter determination unit is configured to determine the condenser total heat exchange amount as a target update parameter.

[0110] In an optional embodiment of the present application, the first acquisition module 1001 comprises: The air intake volume detection sub-module is configured to detect an air intake volume.

[0111] In an optional embodiment of the present application, the first acquisition module 1001 comprises: The reverse calibration sub-module is configured to determine an air intake volume based on the ambient temperature parameter and the compressor intake state parameter.

[0112] In an optional embodiment of the present application, the reverse calibration sub-module comprises: The vehicle speed determination unit is configured to determine a vehicle speed based on the ambient temperature parameter and the compressor intake state parameter. The air intake volume determination unit is configured to determine an air intake volume based on the vehicle speed.

[0113] In an optional embodiment of the present application, the device further comprises: a third determining module configured to determine a refrigerant system operating state; a first displaying module configured to display a preset ambient temperature when the refrigerant system operating state is a fault state; a second displaying module configured to display the ambient temperature parameter when the refrigerant system operating state is a normal state.

[0114] In an optional embodiment of the present application, the second displaying module comprises: a detecting sub-module configured to detect a compressor operating state when the refrigerant system operating state is a normal state; a saturated vapor temperature converting sub-module configured to convert into a saturated vapor temperature based on the compressor suction pressure value and the compressor suction state parameter when the compressor operating state is a non-operating state; a saturated vapor temperature displaying sub-module configured to display the saturated vapor temperature; an ambient temperature displaying sub-module configured to display the ambient temperature parameter when the compressor operating state is an operating state.

[0115] For the device embodiment, it is basically similar to the method embodiment, so the description is relatively simple, and the related parts refer to the part of the method embodiment.

[0116] With reference to Figure 11 The present application also provides an electronic device, comprising: a processor 1101 and a memory 1102, wherein the memory 1102 stores a computer program executable by the processor 1101, and when the electronic device is running, the processor 1101 executes the computer program to perform the refrigerant system control method according to any one of the embodiments of the present application.

[0117] The memory can include a random access memory (RAM) and a non-volatile memory such as at least one disk memory. Optionally, the memory can also be at least one storage device located away from the processor.

[0118] The processor described above can be a general processor, including a central processing unit (CPU), a network processor (NP), etc.; can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component.

[0119] With reference to Figure 12 The embodiment of the present application further provides a computer readable storage medium 1201, wherein the storage medium 1201 stores a computer program, and the computer program is executed by a processor to perform the refrigerant system control method according to any one of the embodiments of the present application.

[0120] Each of the embodiments in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between the embodiments can be referred to each other.

[0121] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, device or computer program product. Therefore, the embodiments of the present application can be in the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware aspects. Moreover, the embodiments of the present application can be in the form of a computer program product implemented on one or more computer usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

[0122] The embodiments of the present application are described with reference to flowcharts and / or block diagrams of the method, terminal device (system) and computer program product according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing terminal device to produce a machine, so that the instructions executed by the computer or other programmable data processing terminal device produce a device for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 The device for implementing the functions specified in one flow or multiple flows and / or blocks Figure 1 The device for implementing the functions specified in one flow or multiple flows and / or blocks

[0123] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the flow Figure 1 The functions of a flow or multiple flows and / or a block or multiple blocks in accordance with the embodiments herein can be implemented as computer program instructions. Figure 1

[0124] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flow Figure 1 The functions of a flow or multiple flows and / or a block or multiple blocks in accordance with the embodiments herein can be implemented as computer program instructions. Figure 1

[0125] The above embodiments are only preferred embodiments of the present application, but the protection scope of the present application is not limited thereto. Any equivalent replacement and transformation made by those skilled in the art based on the present application shall fall within the protection scope of the present application.​​

Claims

1. A refrigerant system control method, characterized in that, include: Acquire air intake volume, compressor intake status parameters, condenser target output parameters, and condenser feedback output parameters; Closed-loop control is performed based on the target output parameters of the condenser and the feedback output parameters of the condenser to determine the compressor exhaust state parameters; Based on the compressor discharge state parameters, determine the target heat exchange parameters of the condenser; Closed-loop control is performed based on the target heat transfer parameters of the condenser and the feedback output parameters of the condenser to determine the ambient temperature parameters; The target output parameters of the condenser are updated based on the ambient temperature parameters, the air intake volume, and the compressor exhaust status parameters. The compressor is controlled based on the compressor exhaust state parameters, and the condenser is controlled based on the updated condenser target output parameters.

2. The method according to claim 1, characterized in that, The step of determining the compressor discharge state parameters by performing closed-loop control based on the target output parameters of the condenser and the feedback output parameters of the condenser includes: Closed-loop control is performed based on the target output parameters of the condenser and the feedback output parameters of the condenser to determine the compressor intake pressure value; Based on the compressor intake pressure value and the compressor intake state parameters, the compressor exhaust state parameters are determined.

3. The method according to claim 2, characterized in that, The condenser target output parameter includes the condenser target output pressure value, and the condenser feedback output parameter includes the condenser feedback output pressure value. The step of determining the compressor intake pressure value by performing closed-loop control based on the condenser target output parameter and the condenser feedback output parameter includes: Determine the pressure difference between the target output pressure value of the condenser and the feedback output pressure value of the condenser; Closed-loop control is performed based on the pressure difference and the condenser feedback output pressure to determine the compressor intake pressure.

4. The method according to claim 3, characterized in that, The method further includes: Obtain compressor performance parameters; A compressor model is constructed based on the compressor performance parameters; The step of determining the compressor discharge state parameters based on the compressor intake pressure value and the compressor intake state parameters includes: Based on the compressor model, the compressor exhaust state parameters are determined according to the compressor intake pressure value and the compressor intake state parameters.

5. The method according to claim 4, characterized in that, The compressor intake state parameters include compressor speed and compressor suction temperature; the step of determining the compressor discharge state parameters based on the compressor model, according to the compressor intake pressure value and the compressor intake state parameters, includes: Substitute the compressor intake pressure, compressor speed, and compressor suction temperature into the compressor model to determine the compressor output mass flow rate and exhaust enthalpy. Based on the exhaust enthalpy value, the compressor exhaust temperature value is determined by looking up the preset refrigerant property parameter table. The compressor exhaust temperature and the compressor output mass flow rate are determined as compressor exhaust state parameters.

6. The method according to claim 4 or 5, characterized in that, The step of constructing a compressor model based on the compressor performance parameters includes: The refrigerant type is determined based on the compressor performance parameters; A compressor model is constructed based on the refrigerant parameters and compressor performance parameters corresponding to the refrigerant type.

7. The method according to claim 6, characterized in that, The compressor model is characterized by mass flow rate and compressor discharge temperature relationships. The step of constructing the compressor model based on the refrigerant parameters and compressor performance parameters corresponding to the refrigerant type includes: The mass flow rate relationship is determined based on the compressor performance parameters; The formula for determining the compressor discharge temperature relationship is based on the refrigerant parameters corresponding to the refrigerant type and the compressor performance parameters.

8. The method according to claim 5, characterized in that, The step of determining the target heat exchange parameters of the condenser based on the compressor discharge state parameters includes: Based on a preset heat exchange strategy, the compressor output mass flow rate and the compressor discharge temperature value are combined to convert the target heat exchange of the condenser. The target heat transfer capacity of the condenser is determined as the target heat transfer parameter of the condenser.

9. The method according to claim 8, characterized in that, The condenser feedback output parameters include the condenser feedback heat transfer. The step of determining the ambient temperature parameters by performing closed-loop control based on the condenser target heat transfer parameters and the condenser feedback output parameters includes: Determine the heat difference between the target heat exchange of the condenser and the feedback heat exchange of the condenser; Closed-loop control is performed based on the heat difference and the feedback heat exchange from the condenser to determine the ambient temperature parameters.

10. The method according to claim 8, characterized in that, The method further includes: Obtain condenser size parameters; An equivalent heat transfer model of the condenser is constructed based on the condenser size parameters; The step of updating the target output parameter of the condenser based on the ambient temperature parameter, the air intake volume, and the compressor exhaust status parameter includes: Based on the condenser equivalent heat transfer model, the ambient temperature parameter, the air intake volume, and the compressor exhaust state parameter are converted into target update parameters; The target output parameters of the condenser are updated using the target update parameters.

11. The method according to claim 10, characterized in that, The steps for constructing an equivalent heat transfer model of the condenser based on the condenser size parameters include: Based on the condenser size parameters, a gaseous refrigerant heat exchange region, a two-phase refrigerant heat exchange region, and a liquid refrigerant heat exchange region are constructed. Determine the heat transfer equations for the gaseous refrigerant heat transfer region, the two-phase refrigerant heat transfer region, and the liquid refrigerant heat transfer region; The equivalent heat transfer model of the condenser is derived by combining the heat transfer relationship of the gaseous refrigerant heat transfer region, the heat transfer relationship of the two-phase refrigerant heat transfer region, and the heat transfer relationship of the liquid refrigerant heat transfer region.

12. The method according to claim 11, characterized in that, The step of determining the heat transfer relationship of the gaseous refrigerant heat transfer region, the heat transfer relationship of the two-phase refrigerant heat transfer region, and the heat transfer relationship of the liquid refrigerant heat transfer region includes: Determine the heat transfer coefficient; Based on the preset convection and conduction heat transfer formula, the heat transfer relationship of the gaseous refrigerant heat transfer region is determined by combining the heat transfer area of ​​the gaseous refrigerant heat transfer region and the heat transfer coefficient. Based on the preset convection and conduction heat transfer formula, the heat transfer relationship of the two-phase refrigerant heat transfer region is determined by combining the heat transfer area of ​​the two-phase refrigerant heat transfer region and the heat transfer coefficient. Based on the preset convection and conduction heat transfer formula, the heat transfer relationship of the liquid refrigerant heat transfer region is determined by combining the heat transfer area of ​​the liquid refrigerant heat transfer region and the heat transfer coefficient.

13. The method according to claim 12, characterized in that, The step of determining the heat transfer relationship of the gaseous refrigerant heat transfer region, the heat transfer relationship of the two-phase refrigerant heat transfer region, and the heat transfer relationship of the liquid refrigerant heat transfer region further includes: The heat transfer coefficient is updated based on the difference between the updated target heat transfer parameters of the condenser and the feedback output parameters of the condenser.

14. The method according to claim 11, characterized in that, The step of converting the ambient temperature parameter, the air intake volume, and the compressor exhaust state parameter into target update parameters based on the condenser equivalent heat transfer model includes: Based on the heat transfer relationship of the gaseous refrigerant heat exchange region, the ambient temperature parameter, the air intake volume, and the compressor exhaust state parameter are converted into output parameters of the gaseous refrigerant heat exchange region; the output parameters of the gaseous refrigerant heat exchange region include the heat transfer capacity of the gaseous refrigerant heat exchange region and the output state quantity of the gaseous refrigerant heat exchange region. Based on the heat transfer relationship of the two-phase refrigerant heat exchange region, the ambient temperature parameter, the air intake volume, and the output state quantity of the gaseous refrigerant heat exchange region are converted into output parameters of the two-phase refrigerant heat exchange region; the output parameters of the two-phase refrigerant heat exchange region include the heat transfer capacity of the two-phase refrigerant heat exchange region and the output state quantity of the two-phase refrigerant heat exchange region. Based on the heat transfer relationship of the liquid refrigerant heat exchange region, the ambient temperature parameter, the air intake volume, and the output state quantity of the two-phase refrigerant heat exchange region are converted into output parameters of the liquid refrigerant heat exchange region; the output parameters of the liquid refrigerant heat exchange region include the heat transfer capacity of the liquid refrigerant heat exchange region and the output state quantity of the liquid refrigerant heat exchange region. The total heat exchange of the condenser is determined by combining the heat exchange capacity of the gaseous refrigerant heat exchange zone, the heat exchange capacity of the two-phase refrigerant heat exchange zone, and the heat exchange capacity of the liquid refrigerant heat exchange zone. The total heat exchange of the condenser is determined as the target update parameter.

15. The method according to claim 1, characterized in that, The steps for obtaining the air intake volume include: Detect the air intake volume.

16. The method according to claim 15, characterized in that, The steps for obtaining the air intake volume include: The intake air volume is determined by reverse calibration based on the ambient temperature parameters and the compressor intake status parameters.

17. The method according to claim 16, characterized in that, The step of determining the intake air volume by performing reverse calibration based on the ambient temperature parameters and the compressor intake state parameters includes: The vehicle speed is determined by combining the ambient temperature parameters and the compressor intake status parameters; The air intake volume is determined based on the vehicle speed.

18. The method according to claim 1, characterized in that, The method further includes: Determine the operating status of the refrigerant system; When the refrigerant system is in a fault state, the preset ambient temperature is displayed; When the refrigerant system is operating normally, the ambient temperature parameter is displayed.

19. The method according to claim 18, characterized in that, The step of displaying the ambient temperature parameter when the refrigerant system is operating normally includes: When the refrigerant system is operating normally, the compressor's operating status is detected. When the compressor is in a non-operating state, the compressor intake pressure value and the compressor intake state parameters are converted into saturated steam temperature. Display the saturated vapor temperature; When the compressor is in working condition, the ambient temperature parameter is displayed.

20. A refrigerant system control device, characterized in that, include: The first acquisition module is used to acquire air intake volume, compressor intake status parameters, condenser target output parameters, and condenser feedback output parameters. The first closed-loop module is used to perform closed-loop control based on the target output parameters of the condenser and the feedback output parameters of the condenser, and to determine the compressor exhaust state parameters. The determination module is used to determine the target heat exchange parameters of the condenser based on the compressor exhaust state parameters; The second closed-loop module is used to perform closed-loop control based on the target heat exchange parameters of the condenser and the feedback output parameters of the condenser to determine the ambient temperature parameters. The update module is used to update the target output parameters of the condenser based on the ambient temperature parameters, the air intake volume, and the compressor exhaust status parameters. The control module is used to control the compressor and the condenser based on the compressor exhaust state parameters and the updated condenser target output parameters.

21. A vehicle, characterized in that, It includes a processor, a memory, and a computer program stored in the memory and capable of running on the processor, wherein the computer program, when executed by the processor, implements the steps of the refrigerant system control method as described in any one of claims 1 to 19.

22. A computer-readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium, which, when executed by a processor, implements the steps of the refrigerant system control method as described in any one of claims 1 to 19.

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