CO2 heat pump system waste heat recovery method, device, medium and equipment

Abstract

The invention belongs to the technical field of automobile air conditioner adjustment, and provides a CO2 heat pump system waste heat recovery method, device, medium and equipment, and the method comprises the steps that a plurality of target air outlet temperatures are obtained, a valve in a CO2 heat pump system is adjusted, and an air source heat pump operation mode or a waste heat recovery mode is achieved; in the operation mode of the air source heat pump, the duty ratio of a cooling fan, the rotating speed of an electric compressor and the opening degree of a valve are adjusted to reach different target air outlet temperatures, and the energy consumption of an electric device under different working conditions is recorded; in the waste heat recovery mode, the duty ratio of an electronic water pump, the rotating speed of an electric compressor and the opening degree of a valve are adjusted to reach different target air outlet temperatures, and the energy consumption of an electric device under different working conditions is recorded; and the optimal operation mode under different target air outlet temperatures is selected by comparing the energy consumption of the electric devices under the air source heat pump operation mode and the water source heat pump operation mode. The optimal COP can be achieved, and the endurance of the new energy electric vehicle is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobile air conditioning regulation, and in particular relates to a waste heat recovery method, device, medium and equipment for a CO2 heat pump system. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] There are more and more new energy electric vehicles on the market, and there is also anxiety about the endurance of electric vehicles. In particular, in low temperature environments, the heating of the passenger compartment and the battery will consume most of the electricity, and related heat pump thermal management solutions are emerging. Due to environmental protection requirements, refrigerants such as R134a and R1234yf are facing the risk of being discontinued, and more environmentally friendly refrigerants such as CO2 and R290 have broader application prospects. Among them, CO2 refrigerant is widely studied due to its environmental protection, non-toxic, non-flammable, non-explosive, and good low-temperature performance.

[0004] For CO2 heat pump systems, waste heat recovery in the motor's electronic control circuit is beneficial to reducing energy consumption, but there is no relevant research on the conditions under which waste heat recovery is used. Summary of the invention

[0005] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a waste heat recovery method, device, medium and equipment for a CO2 heat pump system. The operating mode is achieved by adjusting the valves in the CO2 heat pump system, and the EDC speed, FAN duty cycle, PUMP duty cycle and HVAC blower duty cycle are adjusted to achieve the target state. The energy consumption of each electrical component during the operation of the air source heat pump and the waste heat recovery mode is compared, and the optimal mode is selected to achieve the best COP and improve the endurance of new energy electric vehicles.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A first aspect of the present invention provides a waste heat recovery method for a CO2 heat pump system.

[0008] A waste heat recovery method for a CO2 heat pump system, comprising:

[0009] Obtain several target air outlet temperatures and adjust the valves in the CO2 heat pump system to achieve air source heat pump operation mode or waste heat recovery mode;

[0010] In the air source heat pump operation mode, the duty cycle of the cooling fan, the speed of the electric compressor and the valve opening were adjusted to achieve different target air outlet temperatures, and the energy consumption of the electrical components under different working conditions was recorded;

[0011] In the waste heat recovery mode, the duty cycle of the electronic water pump, the speed of the electric compressor and the valve opening are adjusted to achieve different target air outlet temperatures, and the energy consumption of electrical components under different working conditions is recorded;

[0012] By comparing the energy consumption of electrical components in the air source heat pump operation mode and the water source heat pump operation mode, the optimal operation mode under different target air outlet temperatures is selected.

[0013] Furthermore, under the air source heat pump operation mode, the duty cycles of several cooling fans and the corresponding vehicle intake wind speeds at different vehicle speeds are determined; the vehicle intake wind speed is used as the test bench intake wind speed, the duty cycle of the cooling fan is adjusted, and the energy consumption of the cooling fan at different duty cycles is recorded; in order to achieve different target air outlet temperatures at different external temperatures, the speed and valve opening of the electric compressor are adjusted, and the energy consumption of the electric compressor is recorded.

[0014] Furthermore, in the air source heat pump operation mode, the energy consumption of the electrical device is the sum of the energy consumption of the cooling fan and the energy consumption of the electric compressor.

[0015] Furthermore, in the waste heat recovery mode, the duty cycles of several electronic water pumps and the water flow rate of the motor electronic control circuit at different duty cycles are determined; the water flow rate is used as the test bench water inlet flow rate, the duty cycle of the electronic water pump is adjusted, and the energy consumption of the electronic water pump at different duty cycles is recorded; in order to achieve different target air outlet temperatures at different external temperatures and different water temperatures, the speed and valve opening of the electric compressor are adjusted, and the energy consumption of the electric compressor is recorded.

[0016] Furthermore, in the waste heat recovery mode, the energy consumption of the electrical device is the sum of the energy consumption of the electronic water pump and the energy consumption of the electric compressor.

[0017] A second aspect of the present invention provides a waste heat recovery device for a CO2 heat pump system.

[0018] A waste heat recovery device for a CO2 heat pump system, comprising:

[0019] A mode change module is configured to: obtain a number of target air outlet temperatures and adjust valves in the CO2 heat pump system to achieve an air source heat pump operation mode or a waste heat recovery mode;

[0020] A first energy consumption calculation module is configured to: in an air source heat pump operation mode, adjust the duty cycle of the cooling fan, the speed of the electric compressor and the valve opening to achieve different target air outlet temperatures, and record the energy consumption of the electrical components under different working conditions;

[0021] a second energy consumption calculation module, which is configured to: in the waste heat recovery mode, adjust the duty cycle of the electronic water pump, the speed of the electric compressor and the valve opening to achieve different target air outlet temperatures, and record the energy consumption of the electrical components under different working conditions;

[0022] The energy consumption comparison module is configured to select the optimal operation mode under different target air outlet temperatures by comparing the energy consumption of electrical components under the air source heat pump operation mode and the water source heat pump operation mode.

[0023] Furthermore, the first energy consumption calculation module is specifically configured to: determine the duty cycle of several cooling fans and the corresponding vehicle intake wind speed at different vehicle speeds under the air source heat pump operation mode; use the vehicle intake wind speed as the test bench intake wind speed, adjust the duty cycle of the cooling fan, and record the energy consumption of the cooling fan at different duty cycles; adjust the electric compressor speed and valve opening to achieve different target air outlet temperatures under different external temperatures, and record the energy consumption of the electric compressor.

[0024] Furthermore, the second energy consumption calculation module is specifically configured as follows: in the waste heat recovery mode, determine the duty cycle of several electronic water pumps and the water flow rate of the motor electronic control circuit under different duty cycles; use the water flow rate as the test bench water inlet flow rate, adjust the duty cycle of the electronic water pump, and record the energy consumption of the electronic water pump under different duty cycles; adjust the speed and valve opening of the electric compressor to achieve different target air outlet temperatures under different external temperatures and different water temperatures, and record the energy consumption of the electric compressor.

[0025] A third aspect of the present invention provides a computer-readable storage medium.

[0026] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps in a CO2 heat pump system waste heat recovery method as described in the first aspect above.

[0027] A fourth aspect of the present invention provides a computer device.

[0028] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps in a waste heat recovery method for a CO2 heat pump system as described in the first aspect above are implemented.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention achieves the operating mode by adjusting the valves in the CO2 heat pump system, adjusting the EDC speed, FAN duty cycle, PUMP duty cycle, and HVAC blower duty cycle to achieve the target state, and compares the energy consumption of each electrical component during the operation of the air source heat pump and the waste heat recovery mode, and selects the optimal mode to achieve the best COP and improve the endurance of new energy electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 is a schematic diagram of a CO2 heat pump thermal management system shown in the first embodiment of the present invention;

[0033] Figure 2 is an operating principle diagram of an air source heat pump shown in Embodiment 1 of the present invention;

[0034] Figure 3 This is a schematic diagram of the operation principle of a water source heat pump (waste heat recovery) shown in the first embodiment of the present invention;

[0035] Figure 4 It is a structural diagram of a computer device shown in Embodiment 4 of the present invention. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0038] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0039] It should be noted that the flowcharts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the methods and devices according to various embodiments of the present invention. It should be noted that each box in the flowchart or block diagram can represent a module, a program segment, or a part of the code, and the module, the program segment, or a part of the code may include one or more executable instructions for implementing the logical functions specified in the various embodiments. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, or they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the flowchart and / or block diagram, and the combination of boxes in the flowchart and / or block diagram can be implemented using a dedicated hardware-based device that performs a specified function or operation, or can be implemented using a combination of dedicated hardware and computer instructions.

[0040] Embodiment 1

[0041] This embodiment provides a waste heat recovery method for a CO2 heat pump system.

[0042] The present embodiment provides a waste heat recovery method for a CO2 heat pump system, which clarifies the waste heat recovery operating conditions and achieves the optimal COP value. At the same time, it can save the calibration conditions of the entire vehicle and can be extended to the same type of heat pump systems with waste heat recovery functions.

[0043] The present embodiment provides a waste heat recovery method for a CO2 heat pump system, which achieves an operating mode by adjusting SOV, EXV, and 3WV in the CO2 heat pump system, and adjusts the EDC speed, FAN duty cycle, PUMP duty cycle, and HVAC blower duty cycle to achieve a target state, and compares the energy consumption of various electrical components (EDC, FAN, PUMP, blower, etc.) during the operation of air source heat pumps and water source heat pumps (waste heat recovery) to achieve the best COP and improve the endurance of new energy electric vehicles.

[0044] The present embodiment provides a method for recovering waste heat from a CO2 heat pump system, comprising the following steps:

[0045] Step 1: In the CO2 heat pump system framework control, in order to ensure the normal operation of the compressor and power system within the boundary range, it is necessary to determine the maximum exhaust pressure, exhaust temperature, minimum suction pressure of the compressor and the minimum temperature of the motor operation, and the control of each component must be within this range.

[0046] Step 2, obtain the target outlet air temperature. Since the CO2 heat pump system waste heat recovery method provided in this embodiment is aimed at the heat pump mode, it is necessary to first determine the conditions for entering the CO2 heat pump system: Condition 1: 4℃<outside temperature<28℃ and outside temperature-target outlet air temperature<-10℃; Condition 2: outside temperature ≤4℃ and outside temperature-target outlet air temperature<-2℃; After meeting condition 1 or condition 2, the judgment of entering the waste heat recovery mode is entered, that is, entering step 3.

[0047] Among them, the target air outlet temperature refers to the target temperature of the air outlet of the air conditioner in the car, which is mainly used for judging the entry into the heat pump mode.

[0048] Among them, the external temperature refers to the ambient temperature, which corresponds to the ambient temperature of the condensation room (front-end module air inlet) on the test bench.

[0049] Step 3. The calibration work of the waste heat recovery method of a CO2 heat pump system provided in this embodiment requires a stable operating condition, and basic calibration work needs to be carried out on a test bench. The air source heat pump operating condition and the water source heat pump operating condition keep the outside temperature and the target outlet air temperature consistent, and set the commonly used blower gear according to the comfort calibration model as the HVAC air volume on the test bench.

[0050] like Figure 1 As shown, the CO2 heat pump system includes an air source heat pump and a water source heat pump, and the water source heat pump is used for waste heat recovery.

[0051] Among them, the HVAC air volume corresponds to the duty cycle of the vehicle air conditioning blower. Different HVAC air volumes will cause changes in the operating status of system components. To achieve in-vehicle comfort, the automatic air conditioner will perform PI adjustment on the blower duty cycle, and the blower duty cycle will eventually stabilize to a fixed value, which is used as a set value for the system bench.

[0052] Step 4: Achieve air source heat pump or water source heat pump operation mode by adjusting the valves in the CO2 heat pump system (including the refrigerant on-off valve SOV, the electronic expansion valve EXV, and the three-way cooling solenoid valve 3WV).

[0053] Adjust SOV, EXV, and 3WV in the CO2 heat pump system, specifically including: air source heat pump: SOV1 off, SOV2 off, SOV3 on, SOV off, SOV5 on, EXV1 fully open, EXV2 adjusted, EXV3 off, and 3WV can be uncontrolled; water source heat pump: SOV1 off, SOV2 off, SOV3 on, SOV off, SOV5 off, EXV1 fully open, EXV2 off, EXV3 adjusted, and 3WV 1 and 2 are connected.

[0054] Step 5. Under the air source heat pump operation mode, first determine the different duty cycles of FAN (cooling fan) and the corresponding vehicle intake wind speed at different vehicle speeds; use the intake wind speed as the intake wind speed of the front-end module of the test bench, adjust the duty cycle of the cooling fan, and determine the energy consumption of the corresponding FAN at different duty cycles; adjust the electric compressor speed and valve opening to achieve different target outlet air temperatures at different outside temperatures, determine the opening of EXV2 and the EDC (electric compressor) speed to achieve different target outlet air temperatures at different outside temperatures, and record the EDC energy consumption under different working conditions.

[0055] Among them, the principle of air source heat pump, such as Figure 2 As shown, the refrigerant side operating route of the air source heat pump is: EDC (electric compressor) → open SOV3 (third refrigerant on-off valve) → IGC (evaporator core) → adjustable EXV1 (first electronic expansion valve) → EVAP (evaporator core) → adjustable EXV2 (second electronic expansion valve) → AD IHX (liquid storage and drying bottle with heat recovery function) → GAS COOLER (external air cooler) → open SOV5 (fifth refrigerant on-off valve) → AD IHX (liquid storage and drying bottle with heat recovery function) → EDC (electric compressor).

[0056] Among them, a FAN (cooling fan) is set at the GAS COOLER (external air cooler). EVAP and GC form HVAC (air conditioning box).

[0057] Specifically, for air source heat pumps, first determine the common duty cycle of FAN and the corresponding vehicle inlet wind speed at different vehicle speeds, and determine the different energy consumption conditions corresponding to different FAN proportions, forming Table 1. The inlet wind speed is used as the inlet wind speed of the front-end module of the test bench. The measured values ​​show that the adjustment of EXV2 takes precedence over the adjustment of EXV1 before the stable stage, so EXV2 (step) and the compressor speed are adjusted preferentially in the test bench, and EXV2 and EDC preset values ​​are formed to achieve different target outlet temperatures at different external temperatures, as shown in Table 2, and the EDC energy consumption under different working conditions is recorded at the same time.

[0058] The air volume in Table 2 refers to the HVAC air volume on the test bench.

[0059] Among them, the inlet wind speed refers to the wind speed of the front-end module of the whole vehicle at different vehicle speeds. The purpose is to obtain the duty cycle of the fan at the corresponding wind speed. At the same time, the fan energy consumption can be obtained from the monomer characteristic curve through the duty cycle signal to form the FAN energy consumption data in Table 1.

[0060] It should be noted that EXV1 plays an auxiliary throttling role in the air source heat pump mode. In the initial stage of system design, it is assumed that the dual throttling effect of EXV1 and EXV2 will be better. In the actual system calibration process, if EXV1 is fully opened to adjust EXV2, an optimal opening can be obtained through the sweep point condition of EXV2 opening. When EXV1 and EXV2 are adjusted at the same time, the optimal opening is not unique, which will increase the control difficulty. In order to simplify the control model, the solution of fully opening EXV1 and only adjusting EXV2 is finally adopted.

[0061] Table 1. FAN energy consumption data

[0062] Duty Cycle 1 Duty Cycle 2 Duty Cycle 3 Duty Cycle 4 Duty Cycle 5 Energy consumption

[0063] Table 2. EXV2 and EDC preset values

[0064]

[0065] Step 6. In the water source heat pump operation mode (i.e., waste heat recovery mode), first determine the commonly used duty cycle of the PUMP and the water flow rate of the motor electronic control circuit under this duty cycle; the water flow rate is used as the water inlet flow rate of the Chiller on the test bench to adjust the duty cycle of the electronic water pump and determine the energy consumption of the PUMP under different duty cycles; the water temperature signal is used as the inlet water temperature of the Chiller to adjust the speed of the electric compressor and the valve opening at different outside temperatures and different water temperatures to achieve different target air outlet temperatures, determine the EXV3 opening and electric compressor speed formed to achieve different target air outlet temperatures at different outside temperatures and different water temperatures, and record the EDC energy consumption under different working conditions.

[0066] The water temperature signal is detected by a water temperature sensor (T2) arranged in the motor circuit on the test bench.

[0067] Water source heat pump principle, such as Figure 3 As shown, the refrigerant side operating route of the water source heat pump is: EDC (electric compressor) → open SOV3 (third refrigerant on-off valve) → IGC (internal air cooler) → adjustable EXV1 (first electronic expansion valve) → EVAP (evaporator core) → adjustable EXV3 (third electronic expansion valve) → Chiller (battery cooler) → AD IHX (liquid storage drying bottle with heat recovery function) → EDC.

[0068] The water side operation route of the water source heat pump: PUMP (electronic water pump) → CDU (charger and high and low voltage inverter two-in-one) → Motor (drive motor) → 3WV (three-way cooling solenoid valve, 1 and 2 are connected) → PUMP (electronic water pump).

[0069] Among them, the three-way cooling solenoid valve mainly adopts 1, 2 connection and 2, 3 connection.

[0070] Among them, multiple PTs (temperature and pressure sensors) and Ts (water temperature sensors) are installed on the operating lines of the air source heat pump and the water source heat pump.

[0071] Specifically, for water source heat pumps, first determine the commonly used duty cycle of PUMP and the water flow of the motor electronic control circuit under this duty cycle, and determine the different energy consumption conditions corresponding to different duty cycles of PUMP, forming Table 3. The flow value is used as the water inlet flow of Chiller on the test bench, and the water temperature signal T2 is used as the water inlet temperature of Chiller. The measured value shows that the adjustment of EXV3 takes precedence over the adjustment of EXV1 before the stable stage, so EXV3 (step) and the compressor speed are adjusted preferentially in the test bench, and EXV3 and EDC preset values ​​are formed at different external temperatures (ambient temperatures) and different water temperatures to achieve different target air outlet temperatures, as shown in Table 4, and the EDC energy consumption under different working conditions is recorded at the same time.

[0072] It should be noted that during the use of the actual vehicle, passengers may set different air conditioning temperatures and blower gears (corresponding to HVAC air volume), or use the Auto function and set different air conditioning temperatures to eventually reach a stable blower gear (corresponding to HVAC air volume). The air volume in Table 4 refers to the HVAC air volume on the test bench.

[0073] Among them, the purpose of water flow rate is to obtain the duty cycle of the water pump under the corresponding flow rate. At the same time, the energy consumption of the water pump can be obtained from the monomer characteristic curve through the duty cycle signal, that is, the PUMP energy consumption data in Table 3.

[0074] Waste heat recovery recovers the water side temperature. The water side temperature actually generates heat when the motor is running and is slightly higher than the actual ambient temperature. The heat is different under different working conditions. The temperature change must be considered when corresponding to the test bench, so it is represented by △T in Table 4.

[0075] Table 3. PUMP energy consumption data

[0076] Duty Cycle 1 Duty Cycle 2 Duty Cycle 3 Duty Cycle 4 Duty Cycle 5 flow Energy consumption

[0077] Table 4. EXV3 and EDC preset values

[0078]

[0079] It should be noted that the two heat pump modes actually make the refrigerant run in different circuits by adjusting the opening and closing of the valves in the system. Regardless of which mode is used, the duty cycle of the HVAC blower is quantitative, so it can be directly offset in the process of comparing energy consumption.

[0080] It should be noted that the blower energy consumption is quantitative and can be directly eliminated when comparing energy consumption. At the same time, the blower energy consumption can be obtained from the monomer characteristic curve through the duty cycle signal.

[0081] Step 7: For air source heat pump and water source heat pump (waste heat recovery) to achieve the same target air outlet temperature, the energy consumption of air source heat pump (the sum of EDC, FAN, and blower energy consumption) and the energy consumption of water source heat pump (waste heat recovery) (the sum of EDC, PUMP, and blower energy consumption) are used to form a MAP table. Under various conditions such as different external temperatures and different water temperatures, the optimal operating mode under different target air outlet temperatures can be selected by comparing the energy consumption of the two modes (air conditioning source heat pump and water source heat pump).

[0082] The present embodiment provides a method for recovering waste heat from a CO2 heat pump system, which can be applied to a passenger compartment heat pump heating mode, a battery heat pump heating mode, and a passenger compartment and battery heat pump heating mode at the same time, and can be extended to other refrigerants and other heat pump principle architectures with the same functions.

[0083] The present embodiment provides a waste heat recovery method for a CO2 heat pump system, which achieves an operating mode by adjusting SOV, EXV, and 3WV in the CO2 heat pump system, and adjusts the EDC speed, FAN duty cycle, PUMP duty cycle, and HVAC blower duty cycle to achieve a target state, and compares the energy consumption of various electrical components (EDC, FAN, PUMP, blower, etc.) during the operation of air source heat pumps and water source heat pumps (waste heat recovery) to achieve the best COP and improve the endurance of new energy electric vehicles.

[0084] Embodiment 2

[0085] This embodiment provides a waste heat recovery device for a CO2 heat pump system.

[0086] A waste heat recovery device for a CO2 heat pump system, comprising:

[0087] A mode change module is configured to: obtain a number of target air outlet temperatures and adjust valves in the CO2 heat pump system to achieve an air source heat pump operation mode or a waste heat recovery mode;

[0088] A first energy consumption calculation module is configured to: in an air source heat pump operation mode, adjust the duty cycle of the cooling fan, the speed of the electric compressor and the valve opening to achieve different target air outlet temperatures, and record the energy consumption of the electrical components under different working conditions;

[0089] a second energy consumption calculation module, which is configured to: in the waste heat recovery mode, adjust the duty cycle of the electronic water pump, the speed of the electric compressor and the valve opening to achieve different target air outlet temperatures, and record the energy consumption of the electrical components under different working conditions;

[0090] The energy consumption comparison module is configured to select the optimal operation mode under different target air outlet temperatures by comparing the energy consumption of electrical components under the air source heat pump operation mode and the water source heat pump operation mode.

[0091] The first energy consumption calculation module is specifically configured as follows: under the air source heat pump operation mode, determine the duty cycle of several cooling fans and the corresponding vehicle intake wind speed at different vehicle speeds; use the vehicle intake wind speed as the test bench intake wind speed, adjust the duty cycle of the cooling fan, and record the energy consumption of the cooling fan at different duty cycles; adjust the electric compressor speed and valve opening to achieve different target air outlet temperatures at different external temperatures, and record the energy consumption of the electric compressor.

[0092] The second energy consumption calculation module is specifically configured as follows: in the waste heat recovery mode, determine the duty cycle of several electronic water pumps and the water flow rate of the motor electronic control circuit at different duty cycles; use the water flow rate as the test bench water inlet flow rate, adjust the duty cycle of the electronic water pump, and record the energy consumption of the electronic water pump at different duty cycles; adjust the speed and valve opening of the electric compressor to achieve different target air outlet temperatures at different external temperatures and different water temperatures, and record the energy consumption of the electric compressor.

[0093] It should be noted that the waste heat recovery device for a CO2 heat pump system provided in the above embodiment is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the electronic device can be divided into different functional modules to complete all or part of the functions described above. In addition, the waste heat recovery device for a CO2 heat pump system provided in the above embodiment and the waste heat recovery method embodiment of a CO2 heat pump system belong to the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0094] Embodiment 3

[0095] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps in the method for recovering waste heat from a CO2 heat pump system as described in the first embodiment above are implemented.

[0096] Embodiment 4

[0097] This embodiment provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the steps in the waste heat recovery method of a CO2 heat pump system as described in the first embodiment above are implemented.

[0098] Figure 4 The schematic diagram of the structure of a computer device provided by an exemplary embodiment of the present application is shown. The computer device includes: a processor and a memory.

[0099] The processor may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor may be implemented in at least one hardware form of DSP (Digital Signal Processing), FPGA (Field Programmable Gate Array), and PLA (Programmable Logic Array). The processor may also include a main processor and a coprocessor. The main processor is a processor for processing data in an awake state, also known as a CPU (Central Processing Unit); the coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content that needs to be displayed on the display screen. In some embodiments, the processor may also include an AI (Artificial Intelligence) processor, which is used to process computing operations related to machine learning.

[0100] The memory may include one or more computer-readable storage media, which may be non-transitory. The memory may also include a high-speed random access memory, and a non-volatile memory, such as one or more disk storage devices, flash memory storage devices. In some embodiments, the non-transitory computer-readable storage medium in the memory is used to store at least one computer program, which is used to be used by the processor to implement the vehicle occupant detection method provided in the method embodiment of the present application.

[0101] Those skilled in the art will appreciate that the illustrated structure does not constitute a limitation on the computer device, and may include more or fewer components than illustrated, or combine certain components, or adopt a different component arrangement.

[0102] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A waste heat recovery method for a CO2 heat pump system, characterized in that: include: Obtain several target air outlet temperatures and adjust the valves in the CO2 heat pump system to achieve air source heat pump operation mode or waste heat recovery mode; In the air source heat pump operation mode, the duty cycle of the cooling fan, the speed of the electric compressor and the valve opening were adjusted to achieve different target air outlet temperatures, and the energy consumption of the electrical components under different working conditions was recorded; In the waste heat recovery mode, the duty cycle of the electronic water pump, the speed of the electric compressor and the valve opening are adjusted to achieve different target air outlet temperatures, and the energy consumption of electrical components under different working conditions is recorded; By comparing the energy consumption of electrical components in the air source heat pump operation mode and the water source heat pump operation mode, the optimal operation mode under different target air outlet temperatures is selected.

2. A CO2 heat pump system waste heat recovery method according to claim 1, characterized in that: Under the air source heat pump operation mode, determine the duty cycle of several cooling fans and the corresponding vehicle intake wind speed at different vehicle speeds; use the vehicle intake wind speed as the test bench intake wind speed, adjust the duty cycle of the cooling fan, and record the energy consumption of the cooling fan at different duty cycles; adjust the electric compressor speed and valve opening to achieve different target air outlet temperatures at different external temperatures, and record the energy consumption of the electric compressor.

3. A CO2 heat pump system waste heat recovery method according to claim 2, characterized in that: In the air source heat pump operation mode, the energy consumption of the electrical device is the sum of the energy consumption of the cooling fan and the energy consumption of the electric compressor.

4. A CO2 heat pump system waste heat recovery method according to claim 1, characterized in that: In the waste heat recovery mode, determine the duty ratios of several electronic water pumps and the water flow rate of the motor electronic control circuit at different duty ratios; The water channel flow is used as the test bench water inlet flow, the duty cycle of the electronic water pump is adjusted, and the energy consumption of the electronic water pump under different duty cycles is recorded; To achieve different target air outlet temperatures at different outside temperatures and water temperatures, adjust the speed of the electric compressor and the valve opening, and record the energy consumption of the electric compressor.

5. A CO2 heat pump system waste heat recovery method according to claim 4, characterized in that: In the waste heat recovery mode, the energy consumption of the electrical device is the sum of the energy consumption of the electronic water pump and the energy consumption of the electric compressor.

6. A waste heat recovery device for a CO2 heat pump system, characterized in that: include: A mode change module is configured to: obtain a number of target air outlet temperatures and adjust valves in the CO2 heat pump system to achieve an air source heat pump operation mode or a waste heat recovery mode; A first energy consumption calculation module is configured to: in an air source heat pump operation mode, adjust the duty cycle of the cooling fan, the speed of the electric compressor and the valve opening to achieve different target air outlet temperatures, and record the energy consumption of the electrical components under different working conditions; a second energy consumption calculation module, which is configured to: in the waste heat recovery mode, adjust the duty cycle of the electronic water pump, the speed of the electric compressor and the valve opening to achieve different target air outlet temperatures, and record the energy consumption of the electrical components under different working conditions; The energy consumption comparison module is configured to select the optimal operation mode under different target air outlet temperatures by comparing the energy consumption of electrical components under the air source heat pump operation mode and the water source heat pump operation mode.

7. A waste heat recovery system for a CO2 heat pump system according to claim 6, characterized in that: The first energy consumption calculation module is specifically configured as follows: under the air source heat pump operation mode, determine the duty cycle of several cooling fans and the corresponding vehicle intake wind speed at different vehicle speeds; use the vehicle intake wind speed as the test bench intake wind speed, adjust the duty cycle of the cooling fan, and record the energy consumption of the cooling fan at different duty cycles; adjust the electric compressor speed and valve opening to achieve different target air outlet temperatures at different external temperatures, and record the energy consumption of the electric compressor.

8. A waste heat recovery system for a CO2 heat pump system according to claim 6, characterized in that: The second energy consumption calculation module is specifically configured to: determine the duty ratios of a plurality of electronic water pumps and the water flow rate of the motor electronic control circuit at different duty ratios in the waste heat recovery mode; The water channel flow is used as the test bench water inlet flow, the duty cycle of the electronic water pump is adjusted, and the energy consumption of the electronic water pump under different duty cycles is recorded; To achieve different target air outlet temperatures at different outside temperatures and water temperatures, adjust the speed of the electric compressor and the valve opening, and record the energy consumption of the electric compressor.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps in a waste heat recovery method for a CO2 heat pump system as described in any one of claims 1 to 5 are implemented.

10. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps in the waste heat recovery method of a CO2 heat pump system as described in any one of claims 1-5 are implemented.

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