Thermal management system, and defrosting control method and apparatus, vehicle, device and medium

Abstract

The present application relates to the technical field of vehicles. Provided are a thermal management system, and a defrosting control method and apparatus, a device and a medium. In the present application, when defrosting of a low-temperature radiator is required, a target heat source that can participate in defrosting is selected from a plurality of candidate heat sources of the thermal management system in the present application, and the heat from the target heat source is transferred to the low-temperature radiator for defrosting by means of liquid-liquid heat exchange and / or coolant circulation heat transfer. A defrosting loop determined on the basis of the target heat source is used to realize the transfer of heat from the target heat source, so that the recovery and reuse of the heat in different branches / loops in the thermal management system are achieved, thus reducing the energy consumption of defrosting.

Description

Heat management system, defrosting control method and device, vehicle, equipment and medium

[0001] The present application claims priority to the Chinese patent application No. 202410661333.2, filed on May 24, 2024, and entitled "Heat management system, defrosting control method and device, vehicle, equipment and medium", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of vehicles, in particular to a heat management system, a defrosting control method and device, a vehicle, an electronic device and a storage medium. BACKGROUND

[0003] At present, in order to solve the problems of low-temperature endurance mileage attenuation and high energy consumption of traditional PTC scheme heating of air conditioning system in hybrid power / extended range power vehicles in pure electric mode, most vehicles choose to be equipped with a heat pump air conditioning system, which absorbs air heat through a heat exchanger (such as an outdoor evaporator) arranged in the heat pump air conditioning circuit (i.e. refrigerant circuit) to provide air source heat pump heating for the vehicle. However, the heat exchanger will frost when using air source heat absorption in low temperature environment such as 10 to -5℃, which will affect the system energy efficiency and heating effect.

[0004] Currently, defrosting of the heat exchanger in the heat pump air conditioning system can be achieved by switching the air conditioning system to a refrigeration mode to transfer heat to the outdoor evaporator. This method will affect the comfort and user experience of the passenger cabin temperature, so PTC auxiliary heating defrosting is mainly used. However, PTC auxiliary heating defrosting has high power consumption, high cost and low energy efficiency.

[0005] Therefore, how to provide a heat management system for a vehicle that can provide multiple selectable heat sources for defrosting tasks, and how to provide a low-energy defrosting control method based on the heat management system, have become urgent problems to be solved. SUMMARY

[0006] Therefore, it is necessary to provide a heat management system, a defrosting control method and device, a vehicle, an electronic device and a storage medium to solve the problem of high energy consumption of outdoor heat exchanger defrosting in current vehicles.

[0007] A heat management system, comprising a cooling liquid circuit, a refrigerant circuit provided with a condenser and a battery cooler;

[0008] The cooling liquid circuit comprises an electric drive water pump branch, a low-temperature heat dissipation branch provided with a low-temperature heat dissipator, a battery cooling circuit provided with the battery cooler, a warm air water pump branch provided with the condenser, and a heat exchanger.

[0009] The first end of the heat exchanger one side pipeline is communicated with the first end of the warm air water pump branch, and the second end of the warm air water pump branch is communicated with the second end of the heat exchanger one side pipeline.

[0010] The first end of the electrically driven water pump branch is communicated with the first end of the heat exchanger other side pipeline, the second end of the heat exchanger other side pipeline is communicated with the first end of the low-temperature radiator branch, and the second end of the low-temperature radiator branch is communicated with the second end of the electrically driven water pump branch.

[0011] When the heat management system works in the air source heat pump mode, the low-temperature radiator is used to absorb heat of ambient air.

[0012] In the embodiment of the application, the refrigerant circuit comprises a compressor, a hot gas bypass branch, and a heat pump branch provided with the condenser and the battery cooler; the hot gas bypass branch and the heat pump branch are respectively connected in parallel with the compressor.

[0013] In the embodiment of the application, the coolant circuit further comprises a proportional three-way valve and a coolant bypass branch.

[0014] The first end of the coolant bypass branch is communicated with the first end of the warm air water pump branch, and the second end of the coolant bypass branch is communicated with the second end of the warm air water pump branch.

[0015] The three ports of any communication between the heat exchanger one side pipeline, the warm air water pump branch and the coolant bypass branch are communicated through the proportional three-way valve.

[0016] A defrosting control method based on the heat management system according to any one of the above embodiments, the method comprising:

[0017] Determining whether defrosting treatment is needed for the low-temperature radiator in the heat management system;

[0018] If the defrosting treatment is needed for the low-temperature radiator, selecting a heat source satisfying any one of preset heating conditions from multiple candidate heat sources in the water source heat pump mode as a target heat source for performing the defrosting treatment;

[0019] Determining a defrosting circuit based on a heat transfer path from the target heat source to the low-temperature radiator in the heat management system.

[0020] In the embodiment of the application, the determination of whether the defrosting treatment is needed for the low-temperature radiator in the heat management system comprises:

[0021] If the air source heat pump mode is included in the heat source mode in which the heat management system is currently located, obtaining an ambient temperature and a coolant temperature at the inlet of the low-temperature radiator;

[0022] According to the ambient temperature and the cooling liquid temperature, it is determined whether defrosting treatment needs to be performed on the low-temperature radiator.

[0023] In the embodiments of the present application, the heat source satisfying any preset heating condition is selected from the multiple candidate heat sources in the water source heat pump mode as the target heat source for performing defrosting treatment, comprising:

[0024] It is judged whether the driving state of the vehicle meets the defrosting opening condition;

[0025] If the defrosting opening condition is not met, the heat source mode in which the thermal management system currently stays is switched to the water source heat pump mode, and the driving state is monitored in real time, and the step of judging whether the driving state of the vehicle meets the defrosting opening condition is re-executed;

[0026] If the defrosting opening condition is met, the step of selecting the heat source satisfying any preset heating condition from the multiple candidate heat sources in the water source heat pump mode as the target heat source for performing defrosting treatment is executed.

[0027] In the embodiments of the present application, the driving state includes vehicle speed and / or duration that the vehicle continuously stays in a preset vehicle speed range;

[0028] The defrosting opening condition includes that the vehicle speed does not exceed a preset vehicle speed and / or the duration that the vehicle continuously stays in a preset vehicle speed range exceeds a preset duration.

[0029] In the embodiments of the present application, after the heat source mode in which the thermal management system currently stays is switched to the water source heat pump mode, further comprising:

[0030] It is judged in real time whether the ambient temperature in which the low-temperature radiator stays is located in a preset temperature range;

[0031] If the ambient temperature in which the low-temperature radiator stays is located in the preset temperature range, the air source heat pump mode is re-opened.

[0032] In the embodiments of the present application, the multiple candidate heat sources include engine waste heat and compressor self-generated heat; and the preset heating condition includes engine waste heat recovery condition and the candidate heat source being compressor self-generated heat.

[0033] The heat source satisfying any preset heating condition is selected from the multiple candidate heat sources in the water source heat pump mode as the target heat source for performing defrosting treatment, comprising:

[0034] It is judged whether the working mode of the heating circuit in the thermal management system is a heating mode;

[0035] If the operation mode of the warm air circuit is the heating mode, it is determined whether the engine waste heat meets the engine waste heat recovery condition;

[0036] If yes, the engine waste heat is determined as the target heat source;

[0037] If no, the compressor self-generated heat is determined as the target heat source.

[0038] In the embodiments of the present application, the multiple candidate heat sources include electric drive active heat and electric drive waste heat, and the preset heat supply conditions include an electric drive waste heat recovery condition and an electric drive heating condition;

[0039] The target heat source for performing defrosting treatment is selected from the multiple candidate heat sources of the water source heat pump mode and meets any preset heat supply condition, including:

[0040] If the operation mode of the warm air circuit is not the heating mode, it is determined whether the electric drive waste heat meets the electric drive waste heat recovery condition;

[0041] If yes, the electric drive waste heat is determined as the target heat source;

[0042] If no, the electric drive active heat is determined as the target heat source in the case that both the current ambient temperature and the remaining power of the driving battery meet the electric drive heating condition.

[0043] A defrosting control device based on the heat management system of any of the above embodiments, the device comprising:

[0044] A determination module for determining whether the low-temperature radiator in the heat management system needs to be defrosted;

[0045] A heat source selection module for selecting, if the low-temperature radiator needs to be defrosted, a heat source that meets any preset heat supply condition from multiple candidate heat sources of the water source heat pump mode as a target heat source for performing defrosting treatment;

[0046] A determination module for determining a defrosting circuit based on a heat transfer path of the target heat source to the low-temperature radiator in the heat management system.

[0047] In the embodiments of the present application, the determination module is configured to:

[0048] If the heat source mode in which the heat management system currently stays includes an air source heat pump mode, an ambient temperature and a cooling liquid temperature at the inlet of the low-temperature radiator are obtained;

[0049] According to the ambient temperature and the cooling liquid temperature, it is determined whether the low-temperature radiator needs to be defrosted.

[0050] In the embodiment of the present application, the heat source selection module is configured to:

[0051] determine whether the driving state of the vehicle meets a defrosting starting condition;

[0052] if the defrosting starting condition is not met, switch the current heat source mode of the thermal management system to a water source heat pump mode, and monitor the driving state in real time and re-perform the step of determining whether the driving state of the vehicle meets the defrosting starting condition;

[0053] if the defrosting starting condition is met, perform the step of selecting, from the plurality of candidate heat sources in the water source heat pump mode, a heat source meeting any preset heating condition as a target heat source for performing defrosting treatment.

[0054] In the embodiment of the present application, the driving state includes a vehicle speed and / or a duration for which the vehicle continuously runs in a preset vehicle speed range.

[0055] The defrosting starting condition includes that the vehicle speed does not exceed a preset vehicle speed and / or the duration for which the vehicle continuously runs in the preset vehicle speed range exceeds a preset duration.

[0056] In the embodiment of the present application, the heat source selection module is configured to:

[0057] determine in real time whether an ambient temperature in which the low-temperature radiator is located is within a preset temperature range;

[0058] if the ambient temperature in which the low-temperature radiator is located is within the preset temperature range, re-start the air source heat pump mode.

[0059] In the embodiment of the present application, the plurality of candidate heat sources include engine waste heat and compressor self-generated heat; and the preset heating condition includes an engine waste heat recovery condition and the candidate heat source being compressor self-generated heat.

[0060] The heat source selection module is configured to:

[0061] determine whether a working mode of a heating circuit in the thermal management system is a heating mode;

[0062] if the working mode of the heating circuit is the heating mode, determine whether the engine waste heat meets the engine waste heat recovery condition;

[0063] if yes, determine the engine waste heat as the target heat source;

[0064] if no, determine the compressor self-generated heat as the target heat source.

[0065] In the embodiments of the present application, the multiple candidate heat sources include electric drive active heat and electric drive residual heat, and the preset heat supply condition includes an electric drive residual heat recovery condition and an electric drive heating condition.

[0066] The heat source selection module is configured to:

[0067] If the operation mode of the warm air circuit is not the heating mode, it is determined whether the electric drive residual heat meets the electric drive residual heat recovery condition.

[0068] If yes, the electric drive residual heat is determined as the target heat source.

[0069] If no, in a case where both the current ambient temperature and the remaining electric quantity of the drive battery meet the electric drive heating condition, the electric drive active heat is determined as the target heat source.

[0070] A vehicle comprising the heat management system according to any one of the above embodiments and the defrosting control device according to any one of the above embodiments.

[0071] An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the defrosting control method according to any one of the above embodiments when executing the computer program.

[0072] A computer readable storage medium having a computer program stored thereon, wherein the program, when executed by a processor, implements the steps of the defrosting control method according to any one of the above embodiments.

[0073] In summary, when defrosting of the low-temperature radiator is needed, the present application selects a target heat source that can participate in defrosting from multiple candidate heat sources of the heat management system, and transfers heat of the target heat source to the low-temperature radiator for defrosting through liquid-liquid heat exchange and / or through cooling liquid flow heat transfer. The heat of the target heat source is transferred through a defrosting circuit determined based on the target heat source, so that the heat in different branches / circuits of the heat management system is recycled and utilized, and the defrosting energy consumption is reduced.

[0074] The details of one or more embodiments of the present application are set forth in the accompanying drawings and the description below. Other features and advantages of the present application will become apparent from the description, the drawings, and the claims. BRIEF DESCRIPTION OF DRAWINGS

[0075] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative labor.

[0076] FIG. 1 is a structural schematic diagram of a coolant loop in a thermal management system according to an example embodiment of the present application;

[0077] FIG. 2 is a structural schematic diagram of a refrigerant loop in a thermal management system according to an example embodiment of the present application;

[0078] FIG. 3 is a structural schematic diagram of a coolant loop in a thermal management system according to another example embodiment of the present application;

[0079] FIG. 4 is a flowchart of a defrosting control method according to an example embodiment of the present application;

[0080] FIG. 5 is a flowchart of a defrosting control method according to another example embodiment of the present application;

[0081] FIG. 6 is a flowchart of a defrosting control method according to another example embodiment of the present application;

[0082] FIG. 7 is a flowchart of a defrosting control method according to another example embodiment of the present application;

[0083] FIG. 8 is a flowchart of a defrosting control method according to another example embodiment of the present application;

[0084] FIG. 9 is a schematic block diagram of a defrosting control device according to an example embodiment of the present application;

[0085] FIG. 10 is a schematic block diagram of a vehicle according to an example embodiment of the present application;

[0086] FIG. 11 is an electronic device block diagram according to an example embodiment of the present application. DETAILED DESCRIPTION

[0087] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments of the present application. The embodiments described by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0088] It should be understood that when used in the specification and the appended claims of the present application, the term “comprise” indicates the presence of described features, integers, steps, operations, but does not exclude the presence or addition of one or more other features, integers, steps, operations and / or a collection thereof.

[0089] It should also be understood that, in the description of the application and the appended claims, the term "and / or" is used to mean one or more of the associated listed items, as well as all possible combinations of the items, and includes all possible combinations.

[0090] As used in the description of the application and the appended claims, the term "if' can be interpreted as meaning "when" or "once" or "in response to a determination" or "in response to detecting" depending on the context. Similarly, the phrase "if it is determined" or "if [the described condition or event] is detected" can be interpreted as meaning "once it is determined" or "in response to the determination" or "once [the described condition or event] is detected" or "in response to detecting [the described condition or event]", depending on the context.

[0091] In addition, in the description of the application and the appended claims, the terms "first", "second", "third", etc. are used only to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0092] Reference in the specification to "one embodiment" or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" or "in some embodiments" in various places in the specification are not necessarily all referring to the same embodiment, although it can. The terms "including", "containing", "having" and variations thereof mean "including but not limited to", unless expressly specified otherwise.

[0093] Fig. 1 is a structural schematic diagram of a cooling liquid circuit of a thermal management system according to an exemplary embodiment of the application, and Fig. 2 is a structural schematic diagram of a refrigerant circuit of a thermal management system according to an exemplary embodiment of the application. As shown in Figs. 1-2, the thermal management system 1 includes a cooling liquid circuit 10 and a refrigerant circuit 20.

[0094] The refrigerant circuit 20 can include, but is not limited to, a condenser LCC and a battery chiller, etc. disposed therein.

[0095] The cooling liquid circuit 10 can include, but is not limited to, an electric drive water pump branch 11, a low temperature radiator branch 12 provided with a low temperature radiator LTR, a battery cooling circuit 13 provided with a battery chiller, a warm air water pump branch 14 provided with a condenser LCC, and a heat exchanger PHX.

[0096] The heat sink of the low-temperature heat dissipation branch in the application can provide heat dissipation function when participating in refrigeration, or absorb heat in the air as a vapor heat exchanger when participating in heating to realize an air source heat pump, so as to increase the heat source of the heat management system and reduce the power consumption of heating.

[0097] It should be noted that the heat exchanger described above is a liquid-liquid heat exchanger or an internal heat exchanger, and the two side pipelines arranged inside the heat exchanger exchange heat by using the temperature difference of the medium flowing through the pipelines. For example, a plate-type coaxial tube IHX or a plate heat exchanger PHX can be selected as the heat exchanger described above, and the application only describes the PHX as an exemplary heat exchanger, which is not a limitation of the heat exchanger.

[0098] In the embodiment of the application, the first end of the one-side pipeline of the heat exchanger PHX is in communication with the first end of the warm air water pump branch 14, and the second end of the warm air water pump branch is in communication with the second end of the one-side pipeline of the heat exchanger PHX. That is, a cooling liquid circulation loop is formed based on the warm air water pump branch and the one-side pipeline of the heat exchanger PHX. The warm air water pump branch can include but is not limited to a warm air water pump, a cooling liquid side pipeline of a condenser LCC, a warm air core, etc., and the warm air water pump branch can be used to transfer the heat released by the condenser into the cooling liquid to the warm air core for heating the passenger cabin. In the embodiment of the application, the warm air water pump branch is also used to transfer the heat released by the condenser LCC into the cooling liquid to the one-side pipeline of the heat exchanger PHX, so as to exchange heat with the cooling liquid of the other-side pipeline of the heat exchanger PHX.

[0099] In the embodiment of the application, the first end of the electric drive water pump branch 11 is in communication with the first end of the other-side pipeline of the heat exchanger PHX, the second end of the other-side pipeline of the heat exchanger PHX is in communication with the first end of the low-temperature heat dissipation branch 12, and the second end of the low-temperature heat dissipation branch 12 is in communication with the second end of the electric drive water pump branch 11.

[0100] The electric drive water pump branch 11, the other-side pipeline of the heat exchanger PHX, and the low-temperature heat dissipation branch are sequentially communicated to form a cooling liquid transfer loop. The electric drive water pump branch 11 can include but is not limited to an electric drive water pump, an electric drive device (such as an electric control and a driving motor), etc., and the electric drive water pump branch 11 is used to transfer the heat generated by the electric drive device during operation to other branches through the cooling liquid, or drive the cooling liquid to flow to other branches to absorb heat / release heat through the electric drive water pump. For example, when the electric drive device does not generate heat, the electric drive water pump works to drive the cooling liquid of the electric drive water pump branch to flow through the other-side pipeline of the heat exchanger PHX to absorb the heat in the one-side pipeline of the heat exchanger PHX, and drive the cooled cooling liquid to flow to the low-temperature heat dissipation branch. In this way, the heat in the warm air water pump branch is transferred to the low-temperature heat sink of the low-temperature heat dissipation branch, and the transferred heat is used to heat the low-temperature heat sink to achieve the defrosting effect.

[0101] The application can transfer heat to the low-temperature heat dissipation branch in the following two ways:

[0102] First, when defrosting heat exists in the cooling liquid of the electrically driven water pump branch, the defrosting heat of the electrically driven water pump branch can be selected, and at this time, the electrically driven water pump branch and the low-temperature heat dissipation branch can be communicated;

[0103] Second, when defrosting heat does not exist in the cooling liquid of the electrically driven water pump branch, or the defrosting heat of the electrically driven water pump branch is not used, the heat of the cooling liquid in the warm air water pump branch can be exchanged to the cooling liquid in the other side of the heat exchanger through the heat exchanger, the electrically driven water pump branch, the heat exchanger pipeline and the low-temperature heat dissipation branch are communicated, and the cooling liquid is driven by the electrically driven water pump in the electrically driven water pump branch to circulate between the three. The heat of the cooling liquid in the warm air water pump branch can be engine waste heat or heat absorbed from the refrigerant side by the condenser LCC.

[0104] The heat management system provided in the application sets the heat exchanger for absorbing air heat in the air source heat pump mode in the cooling liquid circuit, that is, the low-temperature heat dissipation device in the low-temperature heat dissipation branch, and uses the battery chiller for liquid-liquid heat exchange instead of the evaporator for heat exchange with air in the refrigerant circuit. In this way, the equipment that may appear frost is transferred from the refrigerant circuit to the cooling liquid circuit. By setting the communication structure relationship between the heat exchanger, the warm air water pump branch, the refrigerant circuit, the low-temperature heat dissipation branch and the engine waste heat branch, the heat transfer path between the warm air water pump branch, the engine waste heat branch, the electrically driven water pump branch and the low-temperature heat dissipation branch is realized, so as to provide multiple selectable heat sources for the low-temperature heat dissipation device defrosting, so as to determine the defrosting circuit with the lowest power consumption in combination with multiple heat sources.

[0105] On the basis of the above embodiment, the condenser LCC and the battery chiller chiller in the refrigerant circuit 20 are arranged in the heat pump branch 21, and the refrigerant circuit 20 can also include but is not limited to the compressor ECP, the hot gas bypass branch 22.

[0106] The hot gas bypass branch 22 and the heat pump branch 21 are respectively connected in parallel to the two ends of the compressor ECP, and the hot gas bypass branch is used to reduce the pressure of the high-temperature and high-pressure gas flowing in the branch, and after the pressure reduction, the gas flows back to the compressor and is re-compressed by the compressor. Thus, a part of the electric energy consumed by the compressor can be converted into self-generated heat, and another part of the electric energy can be used to compress the refrigerant to achieve the heat pump effect. The gas flowing out of the compressor outlet is divided into the heat pump branch and the hot gas bypass branch, and the heat pump branch releases heat to transfer the heat of the refrigerant side to the cooling liquid side.

[0107] In some embodiments, the heat pump branch can include, but is not limited to, a condenser LCC, a battery chiller, an electronic expansion valve EXV1, etc., and the heat pump branch is used to release the heat absorbed by the battery chiller through the condenser, so as to realize the transfer of heat between different circuits / branches on the cooling liquid side. The electronic expansion valve is used for throttling and pressure reduction, and the superheat degree of the compressor inlet is ensured by adjusting the opening of the electronic expansion valve EXV1. In addition, the condenser LCC can be a condenser with a liquid storage tank. If the condenser does not include a liquid storage tank, a liquid desiccant R / D can be provided at the outlet of the condenser LCC.

[0108] Optionally, the hot gas bypass branch can include, but is not limited to, an electronic expansion valve EXV2. By adjusting the opening of the electronic expansion valve EXV2, the refrigerant flow rate flowing into the hot gas bypass branch can be adjusted. The refrigerant in this branch is mixed with the refrigerant flowing out of the battery chiller at the compressor inlet after being reduced in pressure by the EXV2, so as to adjust the temperature of the mixed gas at the compressor inlet, ensure the superheat degree, avoid the situation of liquid hammering the compressor, and regulate the self-generated heat that can be realized by the compressor. The use of the electronic expansion valve EXV2 can accurately regulate the refrigerant flow rate of the hot gas bypass branch, so as to accurately generate self-generated heat according to the needs of the compressor and avoid waste of electric energy.

[0109] In addition, the combination of a hot gas expansion valve and a stop valve can also be used to replace the electronic expansion valve EXV2 to achieve the effect of throttling and pressure reduction.

[0110] As a feasible implementation manner, the cooling liquid circuit can further include a proportional three-way valve TWV1 and a cooling liquid bypass branch. The cooling liquid bypass branch, the warm air water pump branch, and the heat exchanger one side pipeline are connected in parallel, and the proportional three-way valve TWV1 is arranged at any converging point of the three paths. The three ports converging at the converging point are connected by the three ends of the proportional three-way valve TWV1. For example, as shown in FIG. 1, the first end of the cooling liquid bypass branch is connected with the first end of the proportional three-way valve TWV1, the first end of the warm air water pump branch is connected with the second end of the proportional three-way valve TWV1, and the first end of the heat exchanger PHX one side pipeline is connected with the third end of the proportional three-way valve TWV1.

[0111] The second end of the cooling liquid bypass branch and the second end of the heat exchanger PHX one side pipeline are connected with the second end of the warm air water pump branch at the same time.

[0112] The proportional three-way valve TWV1 controls the cooling liquid flowing out of the warm air water pump branch to flow to the cooling liquid bypass branch through the first end of the TWV1 and to flow to the heat exchanger PHX one side pipeline through the third end of the TWV1. The cooling liquid in the warm air water pump branch is divided. The warm air water pump branch and the cooling liquid bypass branch form a warm air circuit for heating the passenger compartment, and the warm air water pump branch and the heat exchanger PHX one side pipeline form a defrosting heat transfer circuit.

[0113] The flow rate of the cooling liquid separated to the bypass branch and the flow rate of the cooling liquid separated to the one side pipe of the heat exchanger PHX can be adjusted by the proportional three-way valve, so as to adjust the defrosting heat transferred from the warm air water pump branch. The defrosting heat transfer circuit and the warm air circuit can be closed by adjusting the valve state of the proportional three-way valve, or the defrosting heat transfer circuit and the warm air circuit can be opened at the same time, so as to transfer the defrosting heat while heating the passenger compartment.

[0114] The warm air water pump branch is connected to the warm air circuit and the defrosting heat transfer circuit at the same time by setting the proportional three-way valve at the first end or the second end of the warm air water pump branch in the present application, so as to heat the passenger compartment and / or defrost the low temperature radiator by the heat of the cooling liquid in the warm air water pump branch. The proportion of the opening degree of each valve of the proportional three-way valve can be adjusted according to the defrosting requirement, so as to adjust the defrosting heat provided to the low temperature radiator, and avoid heat waste. In some embodiments, when there is electric drive residual heat for defrosting, the communication between the second end and the third end of the proportional three-way valve can be disconnected, and the heat of the warm air water pump branch is no longer transferred to the low temperature radiator branch.

[0115] As another possible implementation, the other side pipe of the heat exchanger PHX is connected between the electric drive water pump branch and the low temperature radiator branch by using the four-way valve FWV1. Whether the other side pipe of the heat exchanger PHX is connected between the electric drive water pump branch and the low temperature radiator branch can be controlled by adjusting the communication / closure between each valve of the four-way valve FWV1 when defrosting the low temperature radiator. For example, if the heat exchanged from other circuits by the heat exchanger is needed for defrosting, the electric drive water pump branch, the other side pipe of the heat exchanger and the low temperature radiator branch are communicated in sequence; if only the electric drive residual heat is used for defrosting, the electric drive water pump branch and the low temperature radiator branch are communicated.

[0116] As another possible implementation, the cooling liquid bypass branch and the proportional three-way valve TWV1 can be set as shown in FIG. 3 while the four-way valve FWV1 is set. It should be noted that the first end and the second end mentioned in the embodiments of the present application can be different ports of the inlet and the outlet of the branch / pipe.

[0117] As shown in FIG. 3, the outlet of the electric drive water pump branch is communicated with the first end of the four-way valve FWV1, the second end of the four-way valve FWV1 is communicated with the inlet of the other side pipe of the heat exchanger PHX, the third end of the four-way valve FWV1 is communicated with the outlet of the other side pipe of the heat exchanger PHX, the fourth end of the four-way valve FWV1 is communicated with the inlet of the low temperature radiator branch, and the outlet of the low temperature radiator branch is communicated with the inlet of the electric drive water pump branch.

[0118] As shown in FIG. 3, the proportional three-way valve TWV1 is set at the inlet of the warm air water pump branch.

[0119] In addition, the application can further comprise an engine waste heat branch, and a four-way valve FWV2, an outlet of the engine waste heat branch can be an engine coolant outlet, and an inlet of the engine waste heat branch can be a thermostat pre-coolant inlet.

[0120] The outlet of the engine waste heat branch is communicated with a first end of the four-way valve FWV2, the inlet of the engine waste heat branch is communicated with a second end of the four-way valve FWV2, a third end of the four-way valve FWV2 is communicated with an inlet of the heater water pump in the heater water pump branch, and a fourth end of the four-way valve FWV2 is communicated with a second end of the proportional three-way valve TWV1. In this way, the engine waste heat can be transmitted to the heater water pump branch, and heat can be provided for the passenger cabin heating and / or low-temperature radiator defrosting.

[0121] The heat management system of the application uses the battery cooler of liquid-liquid heat exchange as the heat absorption device in the refrigerant circuit, and sets the air source heat exchanger prone to frosting in the coolant circuit. Then, the engine waste heat is connected to the heater water pump branch through the four-way valve, or the heat of the refrigerant circuit is absorbed through the condenser arranged in the heater water pump branch, and then the heat of the heater water pump branch is transmitted to the low-temperature radiator through the heat exchanger; in addition, the defrosting of multiple heat sources such as the electric drive waste heat or the electric drive stall heat or the electric drive low-efficiency mode heat is realized by connecting the electric drive water pump branch and the low-temperature radiator branch. The heat management system of the application realizes the heat exchange between different branches / circuits, realizes the recycling of heat, provides multiple selectable heat sources for the low-temperature radiator, and realizes the effect of low-energy defrosting.

[0122] FIG. 4 is a flow chart of a defrosting control method according to an exemplary embodiment of the application. The defrosting control method provided by the application can provide multiple selectable heat sources for the low-temperature radiator defrosting based on the heat management system described in any of the above embodiments, and realize low-energy defrosting. As shown in FIG. 4, the method comprises the following steps:

[0123] S401, determining whether the low-temperature radiator in the heat management system needs to be defrosted.

[0124] In the embodiment of the application, the air source heat exchanger is arranged in the coolant circuit, such as the low-temperature radiator LTR, which can exchange heat between the coolant and the air, and is used as a radiator when the heat management system needs to dissipate heat, and is used as an air source heat absorption device (such as an evaporator) when the heat management system needs to absorb heat.

[0125] When the low-temperature radiator absorbs the heat of the air, there is a risk of frosting, which will affect the heat exchange effect.

[0126] Whether the low-temperature radiator needs to be defrosted can be determined by judging whether the low-temperature radiator is frosted.

[0127] S402, if defrosting treatment is needed for the low-temperature heat sink, selecting a heat source satisfying any preset heating condition from multiple candidate heat sources of the water-source heat pump mode as a target heat source for performing defrosting treatment.

[0128] The application represents the mode of obtaining air source heat by the low-temperature heat sink of the heat management system as the air-source heat pump mode.

[0129] Compared with the air-source heat pump mode of heat exchange between the coolant and air, the application represents the mode of heat transfer through liquid-liquid heat exchange and through coolant circulation as the water-source heat pump mode. The devices capable of generating heat in the heat management system can be used as candidate heat sources. Whether each candidate heat source can satisfy any preset heating condition can be determined according to the current working condition of the heat management system. The heat source satisfying any preset heating condition is used as the target heat source for performing defrosting treatment.

[0130] S403, determining a defrosting loop based on the heat transfer path of the target heat source to the low-temperature heat sink in the heat management system.

[0131] After determining the target heat source, the heat transfer path of the target heat source to the low-temperature heat sink can be determined based on the structure of the heat management system of the application. Then, the related devices such as the communication valve and the water pump that need to be controlled are determined. The defrosting loop capable of transferring the heat of the target heat source to the low-temperature heat sink is opened by adjusting the opening / closing of different valves of the communication valve.

[0132] Further, when there are multiple target heat sources, the target heat source that does not affect the current task of the heat management system and the heat transfer path based on the target heat source can be selected in combination with the preset defrosting heat of the low-temperature heat sink, the current working condition of the heat management system and the heat transfer path of the target heat source to the low-temperature heat sink.

[0133] In summary, the defrosting control method provided by the application selects the target heat source that can participate in defrosting from multiple candidate heat sources of the heat management system of the application when defrosting treatment is needed for the low-temperature heat sink. The heat of the target heat source is transferred to the low-temperature heat sink for defrosting through the mode of liquid-liquid heat exchange and / or the mode of coolant circulation heat transfer. The defrosting loop determined based on the target heat source realizes the heat transfer of the target heat source, thereby realizing the recycling of heat in different branches / loops of the heat management system and reducing the defrosting energy consumption.

[0134] On the basis of the above-mentioned embodiments, as shown in FIG. 5, the step S101 of “determining whether defrosting treatment is needed for the low-temperature heat sink in the heat management system” can include the following steps:

[0135] S501, if the heat source mode in which the heat management system currently is includes an air source heat pump mode, obtaining an ambient temperature and a cooling liquid temperature at an inlet of the low temperature radiator.

[0136] When the low temperature radiator is used as the heat absorption device, phase change of the air side gas after heat dissipation occurs, and frosting on the surface of the low temperature radiator is possible, which further affects heat exchange effect. In the present application, when the heat management system is in the air source heat pump mode, the ambient temperature and the cooling liquid temperature at the inlet of the low temperature radiator can be obtained by the temperature acquisition device.

[0137] S502, according to the ambient temperature and the cooling liquid temperature, confirming whether defrosting treatment needs to be performed on the low temperature radiator.

[0138] The cooling liquid temperature at the inlet of the low temperature radiator can be obtained to determine the temperature of the cooling liquid in the low temperature radiator before heat exchange with the ambient air.

[0139] Optionally, the lowest temperature limit of frosting on the surface of the low temperature radiator can be set according to the frost point of the air. For example, the frost point of the air is 0℃, and the cooling liquid temperature threshold before heat exchange in the low temperature radiator can be set as the lowest temperature limit of frosting on the surface of the low temperature radiator based on 0℃, such as -0.5℃. That is, if the cooling liquid temperature in the low temperature radiator before heat exchange is less than -0.5℃, it is considered that the surface temperature of the low temperature radiator reaches the frost point of the air, and the gas in contact with the surface of the low temperature radiator can frost on the surface of the low temperature radiator after heat exchange between the cooling liquid and the air. Correspondingly, when the cooling liquid temperature at the inlet of the low temperature radiator is greater than or equal to -0.5℃, the surface temperature of the low temperature radiator does not reach the frost point of the air, and it is difficult to appear frosting on the surface of the low temperature radiator. Therefore, the cooling liquid temperature threshold at the inlet of the low temperature radiator can be set as -0.5℃. When the cooling liquid temperature at the inlet of the low temperature radiator is greater than or equal to the above cooling liquid temperature threshold, it is considered that the low temperature radiator does not need to be defrosted, and when the cooling liquid temperature at the inlet of the low temperature radiator is less than the above cooling liquid temperature threshold, it is considered that the low temperature radiator has the possibility of frosting.

[0140] In addition, in order to accurately determine the result, when the cooling liquid temperature at the inlet of the low temperature radiator is lower than the above cooling liquid temperature threshold (such as -0.5℃), the following process can be further added: judging the temperature difference between the ambient temperature and the cooling liquid temperature at the inlet of the low temperature radiator.

[0141] Optionally, when the difference between the ambient temperature T and the cooling liquid temperature T1 at the inlet of the low-temperature radiator is greater than or equal to a preset temperature difference threshold (e.g., T-T1≥5), it is determined that defrosting of the low-temperature radiator is needed; when the difference between the ambient temperature T and the cooling liquid temperature T1 at the inlet of the low-temperature radiator is less than the preset temperature difference threshold, it is determined that defrosting of the low-temperature radiator is not needed. The temperature difference threshold can be set according to the heat exchange efficiency of the low-temperature radiator in the current thermal management system; or in the case that the cooling liquid temperature at the inlet of the low-temperature radiator is lower than a cooling liquid temperature threshold, the heat exchange process between different ambient temperatures and different cooling liquid temperatures is tested to determine whether frosting occurs, so as to determine the above-mentioned temperature difference threshold. For example, when the cooling liquid temperature at the inlet of the low-temperature radiator is less than -0.5℃, if the difference between the ambient temperature and the cooling liquid temperature at the inlet of the low-temperature radiator is greater than or equal to 5℃, it is determined that air will freeze into frost on the surface of the low-temperature radiator after heat exchange with the cooling liquid, and it is determined that defrosting of the low-temperature radiator is needed; when the cooling liquid temperature at the inlet of the low-temperature radiator is greater than or equal to -0.5℃, or when the cooling liquid temperature at the inlet of the low-temperature radiator is less than -0.5℃ and the difference between the ambient temperature and the cooling liquid temperature at the inlet of the low-temperature radiator is less than 5℃, it is determined that defrosting of the low-temperature radiator is not needed.

[0142] It should be noted that the above-mentioned cooling liquid temperature threshold can be set according to the air frost point and the required error range of the low-temperature radiator of the current thermal management system, such as setting a temperature difference of ±0.5℃, or setting a temperature difference of ±0.3℃, etc., which is not limited in the present application.

[0143] In practice, in addition to the above-mentioned embodiments, whether frosting occurs can also be determined by setting a temperature / humidity sensor on the air side surface of the low-temperature radiator.

[0144] In the air source heat pump mode of the thermal management system, the present application determines whether frosting occurs on the low-temperature radiator based on the ambient temperature and the cooling liquid temperature at the inlet of the low-temperature radiator, and then determines whether defrosting of the low-temperature radiator is needed. By limiting the cooling liquid temperature at the inlet of the low-temperature radiator and the difference between the ambient temperature and the cooling liquid temperature at the inlet of the low-temperature radiator, it is determined whether the current temperature condition meets the condition of air freezing into frost on the surface of the low-temperature radiator, thereby enhancing the accuracy of the frosting determination of the low-temperature radiator.

[0145] Based on the above-mentioned embodiments, as shown in FIG. 6, the step S102 of “selecting a heat source that meets any of the preset heating conditions from the multiple candidate heat sources of the water source heat pump mode as the target heat source for defrosting” can include the following steps:

[0146] S601, determining whether the driving state of the vehicle meets the defrosting start condition.

[0147] S602, if the defrosting opening condition is not met, switching the current heat source mode of the thermal management system to a water source heat pump mode, and monitoring the driving state in real time, and re-executing the step of judging whether the driving state of the vehicle meets the defrosting opening condition.

[0148] S603, if the defrosting opening condition is met, executing the step of selecting a heat source meeting any preset heating condition from the multiple candidate heat sources of the water source heat pump mode as the target heat source for performing the defrosting treatment.

[0149] In practice, the low-temperature radiator as a device for heat exchange with air can be arranged at the vehicle head ventilation, and the vehicle head wind speed can be estimated according to the driving state of the vehicle, and the defrosting effect will be affected at a higher head wind speed.

[0150] The defrosting opening condition can include a preset driving state, and when the driving state of the vehicle reaches the preset driving state, the defrosting treatment of the low-temperature radiator can be opened; and when the driving state of the vehicle does not reach the preset driving state, the defrosting treatment of the low-temperature radiator is not opened.

[0151] In the case of confirming the need for defrosting of the low-temperature radiator, if the defrosting is not opened due to the current driving state not meeting the defrosting opening condition, the current selected heat source mode of the thermal management system can be switched to a water source heat pump mode, for example, when only air source heat pump heating is used, the heat source mode is directly switched from the air source heat pump mode to the water source heat pump mode; when the air source heat pump heating and the water source heat pump heating are currently used, the current heat source mode is adjusted to a water source heat pump mode using only water source heat pump heating, so as to avoid aggravating the frosting of the low-temperature radiator, and reduce the influence of the frosting of the low-temperature radiator on the vehicle heating.

[0152] In addition, in addition to switching the heat source mode, the application also monitors the driving state of the vehicle in real time, and re-judges whether the current driving state meets the defrosting opening condition after monitoring the current driving state of the vehicle.

[0153] When the driving state of the vehicle meets the defrosting opening condition, the defrosting treatment of the low-temperature radiator is opened again, that is, the step of "selecting a heat source meeting any preset heating condition from the multiple candidate heat sources of the water source heat pump mode as the target heat source for performing the defrosting treatment" in the above step S102 is continued.

[0154] The embodiment of the application sets a judgment on the driving state of the vehicle before determining that the target heat source needs to perform defrosting treatment. If the driving state of the current vehicle makes the low-temperature radiator easy to be affected by a relatively high head wind speed, the defrosting treatment of the low-temperature radiator is not started to ensure the defrosting effect. However, in order to avoid aggravating the frosting of the low-temperature radiator and affecting the heating of the vehicle, the current air source heat pump mode is closed, the water source heat pump mode is set as the heat source mode of the current thermal management system, and the defrosting treatment of the low-temperature radiator is started when the driving state of the vehicle meets the defrosting starting condition. In this way, the defrosting efficiency is ensured, the waste of defrosting heat is avoided, and the influence of the frosting and defrosting of the low-temperature radiator on the heating of the vehicle is reduced.

[0155] On the basis of the above embodiment, the driving state can include the vehicle speed and / or the duration that the vehicle continuously runs in the preset vehicle speed range; and the corresponding defrosting starting condition can include, but is not limited to, that the vehicle speed is less than or equal to the preset vehicle speed and / or the duration that the vehicle continuously runs in the preset vehicle speed range is greater than or equal to the preset duration.

[0156] For example, the above preset vehicle speed can be set to 10 km / h, the corresponding preset vehicle speed range can be set to V≤10 km / h, and the preset duration can be set to 3 minutes.

[0157] The application avoids the influence of the large change of the vehicle speed in a short time (for example, the user accelerates after instantaneously reducing the speed, or accelerates after temporarily reducing the speed when passing through a red-green light intersection) on the judgment process corresponding to the defrosting starting condition by setting the preset duration.

[0158] The application considers that the current driving state meets the defrosting starting condition when the vehicle speed is less than or equal to 10 km / h and the duration that the vehicle speed is less than or equal to 10 km / h is greater than or equal to 3 minutes. Otherwise, it is considered that the current driving state does not meet the defrosting starting condition.

[0159] It should be noted that the preset vehicle speed and the preset duration can be set as needed, and the specific values are not limited in the application.

[0160] The embodiment of the application selects the driving state in which the vehicle speed is relatively stable and does not cause a relatively high head wind by setting the preset vehicle speed and the preset duration, and starts the defrosting treatment of the low-temperature radiator in this driving state to ensure the defrosting effect. The application improves the accuracy of the condition selection of the vehicle speed by limiting the preset duration.

[0161] On the basis of the above embodiment, as shown in FIG. 7, after the step S602 of “switching the heat source mode of the current thermal management system to the water source heat pump mode”, it is further set that after the defrosting treatment process of the low-temperature radiator is completed, the defrosting control method further includes the following steps:

[0162] S701, judging whether the ambient temperature where the low-temperature radiator is located is within a preset temperature range in real time.

[0163] In the case that the air source heat pump mode is closed and the water source heat pump mode is used as the heat source mode of the thermal management system, the ambient temperature where the low-temperature radiator is located is acquired in real time, and after the current ambient temperature is acquired, it is judged whether the current ambient temperature is within a preset temperature range.

[0164] The preset temperature range is a preset ambient temperature range for the normal heat exchange process of the low-temperature radiator in the air source heat pump mode, which can be set as needed and is not limited in the present application. For example, it is set as [10℃, -10℃].

[0165] S702, if the ambient temperature where the low-temperature radiator is located is within the preset temperature range, the air source heat pump mode is restarted.

[0166] If the ambient temperature where the low-temperature radiator is located is within the preset temperature range, it can be considered that the low-temperature radiator after defrosting can absorb heat from the air at the current ambient temperature and be used as an air source heat exchanger, so the air source heat pump mode is restarted to increase the heat source of the thermal management system and reduce the power consumption for heating.

[0167] The embodiment of the present application restarts the low-temperature radiator when the defrosting of the low-temperature radiator is completed and the current ambient temperature meets the working temperature of the low-temperature radiator as an air source heat exchanger, so as to increase the heat source of the thermal management system and reduce the power consumption for heating.

[0168] On the basis of the above-mentioned embodiment, the plurality of candidate heat sources can include but are not limited to engine waste heat and compressor self-generated heat; and the preset heat supply condition can include but is not limited to engine waste heat recovery condition and the candidate heat source being compressor self-generated heat.

[0169] Correspondingly, as shown in FIG. 8, the above-mentioned step S102 of “selecting a heat source meeting any preset heat supply condition from the plurality of candidate heat sources of the water source heat pump mode as a target heat source for performing defrosting treatment” can include the following steps:

[0170] S801, judging whether the working mode of the warm air circuit in the thermal management system is a heating mode;

[0171] The working mode of the warm air circuit can be a heating mode and a non-heating mode, and the non-heating mode can include but is not limited to a refrigeration mode.

[0172] The control unit can determine whether the heating mode of the warm air circuit by determining whether the heating mode of the passenger cabin air conditioner, or by monitoring the state of the damper in the warm air core of the warm air circuit.

[0173] S802, if the working mode of the warm air circuit is the heating mode, determine whether the engine waste heat meets the engine waste heat recovery condition.

[0174] When the warm air circuit is in the heating mode, it is further necessary to determine whether the engine waste heat meets the engine waste heat recovery condition.

[0175] For example, the engine waste heat recovery condition can be set to the coolant temperature of the engine outlet port exceeding the preset defrosting temperature, that is, when the engine waste heat meets the engine waste heat recovery condition, it can be considered that there is engine waste heat that can be transferred to the low-temperature radiator to complete defrosting.

[0176] For another example, the engine waste heat recovery condition can also be set to the engine being in the working state and the coolant temperature of the engine outlet port being greater than or equal to a temperature threshold, which can be set based on the heat loss in the heat transfer process from the engine waste heat branch to the low-temperature radiator, that is, when the engine waste heat meets the engine waste heat recovery condition, it can be considered that there is engine waste heat that can be transferred to the low-temperature radiator to participate in defrosting. For example, the heat recovery condition is set to the engine being in the running state and the engine cylinder head outlet water temperature being greater than or equal to 60°C.

[0177] It should be noted that the specific values of the above preset defrosting temperature and the above temperature threshold can be set as needed, and the present application does not limit.

[0178] S803, if it is satisfied, the engine waste heat is determined as the target heat source.

[0179] S804, if it is not satisfied, the compressor self-created heat is determined as the target heat source.

[0180] If the current engine waste heat meets the engine waste heat recovery condition, the engine waste heat is determined as the target heat source for the low-temperature radiator defrosting. If the current engine waste heat does not meet the engine waste heat recovery condition, the refrigerant circuit generates compressor self-created heat, and the compressor self-created heat is taken as the target heat source.

[0181] Based on the heat management system structure described in the above embodiments, in the present application, the engine waste heat and the heat generated by the refrigerant circuit need to be transmitted to the low-temperature radiator through the warm air water pump branch and the other side pipeline of the heat exchanger PHX. Therefore, when the warm air circuit is in the heating mode, the warm air water pump branch is used to transmit the heat for heating the passenger compartment. In this working condition, using the warm air water pump branch to transmit the defrosting heat will not affect the heating of the passenger compartment.

[0182] The present application recycles the engine waste heat to save the electricity consumed for defrosting. When the engine waste heat cannot provide the defrosting heat, the compressor is started to create heat, thereby ensuring the heat required by the low-temperature radiator. In addition, when the warm air water pump branch needs to be used to transmit the defrosting heat, the warm air circuit is first judged. When the warm air circuit is in the heating mode, the judgment is made on whether the heat source used to transmit the heat to the low-temperature radiator through the warm air water pump branch is available. When the warm air circuit is not in the heating mode, the judgment is not made on the heat source. Thus, the defrosting is realized without affecting the heating demand of the passenger compartment.

[0183] Optionally, when the working mode of the warm air circuit is not the heating mode, it is further judged whether the electric drive waste heat meets the electric drive waste heat recycling condition. If yes, the electric drive waste heat is determined as the target heat source. If no, the electric drive active heat is determined as the target heat source when the current environmental temperature and the remaining electric quantity of the drive battery both meet the electric drive heating condition. In this way, when the warm air circuit is not in the heating mode, the electric drive water pump branch is used to defrost, and the warm air water pump branch in the warm air circuit is not used to transmit the defrosting heat, thereby realizing the defrosting without affecting the current working mode of the passenger compartment air conditioner.

[0184] Optionally, before judging the working mode of the warm air circuit, it is first judged whether there is available electric drive waste heat. If yes, the electric drive waste heat is used for defrosting. If no, the step of judging the working mode of the warm air circuit is continued, and if the working mode is the heating mode, the step of selecting the target heat source from the engine waste heat and the compressor self-created heat is continued. If the working mode is not the heating mode, the judgment process of the electric drive active heat is performed.

[0185] The electric drive active heat can include the heat obtained by controlling the drive motor to be blocked or by controlling the drive motor to operate at low efficiency.

[0186] On the basis of the above embodiments, the defrosting circuit can be determined by the following methods:

[0187] One, if the target heat source is engine waste heat, the engine waste heat branch is connected in series to the warm air circuit, the warm air water pump branch and the heat exchanger side pipeline in the warm air circuit are communicated, so that the engine waste heat is transmitted to the heat exchanger side pipeline. And the low-temperature heat dissipation branch, the electric drive water pump branch and the heat exchanger other side pipeline are communicated in turn, so that the engine waste heat is absorbed from the heat exchanger side pipeline and transmitted to the low-temperature heat dissipation branch.

[0188] Two, if the target heat source is electric drive active heat or electric drive waste heat, the low-temperature heat dissipation branch and the electric drive water pump branch are communicated, so that the electric drive active heat or the electric drive waste heat is transmitted to the low-temperature heat dissipation branch.

[0189] Three, if the target heat source is compressor self-generated heat, the hot gas bypass branch and the water pump branch of the refrigerant circuit are turned on, the warm air water pump branch and the heat exchanger side pipeline are communicated, so that the compressor self-generated heat is transmitted from the refrigerant circuit to the heat exchanger side pipeline; and the low-temperature heat dissipation branch, the electric drive water pump branch and the heat exchanger other side pipeline are communicated in turn, so that the compressor self-generated heat is absorbed from the heat exchanger side pipeline and transmitted to the low-temperature heat dissipation branch.

[0190] In summary, the heat exchanger that absorbs heat from air is arranged in the cooling liquid side, and the heat in different branches / circuits in the cooling liquid side is used for defrosting. The auxiliary PTC of the outdoor heat exchanger is no longer needed for heating and defrosting, so that the cost is reduced and the energy consumption is reduced. The defrosting circuit that does not affect the working mode is selected for defrosting heat transmission according to the current working mode of the passenger cabin air conditioner, i.e. the current working mode of the warm air circuit, so that the influence of the defrosting process on the comfort of the passenger cabin is avoided.

[0191] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution, and the execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the application.

[0192] Fig. 9 is a block diagram of a defrosting control device according to an exemplary embodiment of the application, as shown in Fig. 9, the device 900 includes a judgment module 901, a heat source selection module 902 and a determination module 903.

[0193] The judgment module 901 is used to determine whether the low-temperature heat radiator in the heat management system needs to be defrosted;

[0194] The heat source selection module 902 is used to select a heat source that meets any pre-set heating condition as a target heat source for performing defrosting treatment from a plurality of candidate heat sources in the water source heat pump mode if the low-temperature heat radiator needs to be defrosted.

[0195] determining module 903 is configured to determine the defrosting circuit based on the heat transfer path of the target heat source to the low-temperature radiator in the heat management system.

[0196] In the embodiments of the present application, the determining module is configured to:

[0197] If the heat source mode in which the heat management system currently stays includes the air source heat pump mode, the ambient temperature and the coolant temperature at the inlet of the low-temperature radiator are obtained.

[0198] The defrosting treatment of the low-temperature radiator is determined based on the ambient temperature and the coolant temperature.

[0199] In the embodiments of the present application, the heat source selection module is configured to:

[0200] determine whether the driving state of the vehicle meets the defrosting opening condition;

[0201] If the defrosting opening condition is not met, the heat source mode in which the heat management system currently stays is switched to the water source heat pump mode, the driving state is monitored in real time, and the step of determining whether the driving state of the vehicle meets the defrosting opening condition is re-executed.

[0202] If the defrosting opening condition is met, the step of selecting the heat source meeting any preset heating condition from the multiple candidate heat sources of the water source heat pump mode as the target heat source for performing the defrosting treatment is executed.

[0203] In the embodiments of the present application, the driving state includes the vehicle speed and / or the duration that the vehicle stays in the preset vehicle speed range.

[0204] The defrosting opening condition includes that the vehicle speed does not exceed the preset vehicle speed and / or the duration that the vehicle stays in the preset vehicle speed range exceeds the preset duration.

[0205] In the embodiments of the present application, the heat source selection module is configured to:

[0206] determine in real time whether the ambient temperature in which the low-temperature radiator stays is located in the preset temperature range;

[0207] If the ambient temperature in which the low-temperature radiator stays is located in the preset temperature range, the air source heat pump mode is re-opened.

[0208] In the embodiments of the present application, the multiple candidate heat sources include engine waste heat and compressor self-generated heat; and the preset heating condition includes an engine waste heat recovery condition and the candidate heat source being compressor self-generated heat.

[0209] The heat source selection module is configured to:

[0210] determining whether the operation mode of the warm air circuit in the thermal management system is a heating mode;

[0211] if the operation mode of the warm air circuit is the heating mode, determining whether the engine waste heat meets the engine waste heat recovery condition;

[0212] if yes, determining the engine waste heat as the target heat source;

[0213] if no, determining the compressor self-generated heat as the target heat source.

[0214] In the embodiments of the present application, the plurality of candidate heat sources includes electric drive active heat and electric drive waste heat, and the preset heat supply condition includes an electric drive waste heat recovery condition and an electric drive heating condition.

[0215] The heat source selection module is configured to:

[0216] if the operation mode of the warm air circuit is not the heating mode, determining whether the electric drive waste heat meets the electric drive waste heat recovery condition;

[0217] if yes, determining the electric drive waste heat as the target heat source;

[0218] if no, in the case that both the current ambient temperature and the remaining power of the drive battery meet the electric drive heating condition, determining the electric drive active heat as the target heat source.

[0219] In summary, the defrosting control device proposed in the present application selects a target heat source that can participate in defrosting from a plurality of candidate heat sources of the thermal management system when defrosting of the low-temperature radiator is required, and transfers heat of the target heat source to the low-temperature radiator for defrosting through liquid-liquid heat exchange and / or through cooling liquid flow heat transfer. The defrosting circuit determined based on the target heat source realizes heat transfer of the target heat source, thereby realizing recycling and utilization of heat in different branches / circuits of the thermal management system and reducing defrosting energy consumption.

[0220] To implement the above-mentioned embodiments, as shown in FIG. 10, the embodiments of the present application further propose a vehicle 1000 comprising the thermal management system 1 according to any one of the above-mentioned embodiments and the defrosting control device 900 according to any one of the above-mentioned embodiments.

[0221] To implement the above-mentioned embodiments, the embodiments of the present application further propose an electronic device 1100, as shown in FIG. 11, which specifically can comprise a memory 1101, a processor 1102, and a computer program stored in the memory 1101 and capable of running on the processor 1102, and the processor 1102 implements the steps of the defrosting control method shown in the above-mentioned embodiments when executing the program.

[0222] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, storage, database or other medium used in each embodiment provided by the present application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0223] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above-mentioned division of functional units and modules is exemplified, and in actual application, the above-mentioned functions can be completed by different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above.

[0224] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A thermal management system, wherein, The cooling liquid circuit comprises an electric drive water pump branch, a low-temperature radiator branch provided with a low-temperature radiator, a battery cooling circuit provided with the battery cooler, a warm air water pump branch provided with the condenser, and a heat exchanger. The first end of the warm air water pump branch is in communication with the first end of the heat exchanger one-side pipeline, and the second end of the warm air water pump branch is in communication with the second end of the heat exchanger one-side pipeline. The first end of the electric drive water pump branch is in communication with the first end of the heat exchanger other-side pipeline, the second end of the heat exchanger other-side pipeline is in communication with the first end of the low-temperature radiator branch, and the second end of the low-temperature radiator branch is in communication with the second end of the electric drive water pump branch. When the heat management system works in the air source heat pump mode, the low-temperature radiator is used to absorb heat of ambient air. The refrigerant circuit comprises a compressor, a hot gas bypass branch, and a heat pump branch provided with the condenser and the battery cooler; and the hot gas bypass branch and the heat pump branch are respectively connected in parallel with the compressor.

2. The thermal management system of claim 1, wherein, The cooling liquid circuit further comprises a proportional three-way valve and a cooling liquid bypass branch.

3. The thermal management system of claim 1 or 2, wherein, The first end of the cooling liquid bypass branch is in communication with the first end of the warm air water pump branch, and the second end of the cooling liquid bypass branch is in communication with the second end of the warm air water pump branch. The three ports of any communication between the heat exchanger one-side pipeline, the warm air water pump branch, and the cooling liquid bypass branch are communicated through the proportional three-way valve. The heat management system based on any one of claims 1-3, the method comprising:

4. A defrosting control method, wherein, determining whether defrosting treatment is needed for the low-temperature radiator in the heat management system; if defrosting treatment is needed for the low-temperature radiator, selecting a heat source satisfying any one of preset heating conditions from multiple candidate heat sources in the water source heat pump mode as a target heat source for performing defrosting treatment; determining a defrosting circuit based on a heat transfer path from the target heat source to the low-temperature radiator in the heat management system. The determination of whether defrosting treatment is needed for the low-temperature radiator in the heat management system comprises:

5. The method of claim 4, wherein, if the heat source mode currently adopted by the heat management system includes the air source heat pump mode, obtaining an ambient temperature and a cooling liquid temperature at an inlet of the low-temperature radiator; determining whether defrosting treatment is needed for the low-temperature radiator according to the ambient temperature and the cooling liquid temperature. The selection of a heat source satisfying any one of preset heating conditions from multiple candidate heat sources in the water source heat pump mode as a target heat source for performing defrosting treatment comprises:

6. The method of claim 4, wherein, judging whether a driving state of the vehicle satisfies a defrosting opening condition; if the defrosting opening condition is not satisfied, switching the heat source mode currently adopted by the heat management system to the water source heat pump mode, and monitoring the driving state in real time and re-executing the step of judging whether the driving state of the vehicle satisfies the defrosting opening condition; if the defrosting opening condition is satisfied, performing the step of selecting a heat source satisfying any one of preset heating conditions from multiple candidate heat sources in the water source heat pump mode as a target heat source for performing defrosting treatment. ​ 7. The method of claim 6, wherein, The driving state comprises a vehicle speed, and / or a duration that the vehicle continuously stays in a preset vehicle speed range; The defrosting opening condition comprises that the vehicle speed does not exceed a preset vehicle speed, and / or the duration that the vehicle continuously stays in the preset vehicle speed range exceeds a preset duration.

8. The method of claim 6, wherein, After switching the heat source mode of the heat management system to the water source heat pump mode, the method further comprises: determining whether an ambient temperature of the low-temperature radiator is within a preset temperature range; if the ambient temperature of the low-temperature radiator is within the preset temperature range, re-opening the air source heat pump mode.

9. The method of claim 4, wherein, The multiple candidate heat sources comprise engine waste heat and compressor self-generated heat; and the preset heat supply condition comprises an engine waste heat recovery condition and the candidate heat source being compressor self-generated heat. The method of selecting, from the multiple candidate heat sources in the water source heat pump mode, a heat source satisfying any preset heat supply condition as a target heat source for performing defrosting treatment comprises: determining whether a working mode of a heating circuit in the heat management system is a heating mode; if the working mode of the heating circuit is the heating mode, determining whether the engine waste heat satisfies the engine waste heat recovery condition; if yes, determining the engine waste heat as the target heat source; if no, determining the compressor self-generated heat as the target heat source.

10. The method of claim 4, wherein, The multiple candidate heat sources comprise electric drive active heat and electric drive waste heat, and the preset heat supply condition comprises an electric drive waste heat recovery condition and an electric drive heating condition. The method of selecting, from the multiple candidate heat sources in the water source heat pump mode, a heat source satisfying any preset heat supply condition as a target heat source for performing defrosting treatment comprises: if the working mode of the heating circuit is not the heating mode, determining whether the electric drive waste heat satisfies the electric drive waste heat recovery condition; if yes, determining the electric drive waste heat as the target heat source; if no, in a case that both a current ambient temperature and a remaining electric quantity of a drive battery satisfy the electric drive heating condition, determining the electric drive active heat as the target heat source.

11. A defrosting control device, wherein, The heat management system according to any one of claims 1-3, comprising: a determination module configured to determine whether defrosting treatment is needed for a low-temperature radiator in the heat management system; a heat source selection module configured to, if the defrosting treatment is needed for the low-temperature radiator, select, from multiple candidate heat sources in a water source heat pump mode, a heat source satisfying any preset heat supply condition as a target heat source for performing the defrosting treatment; a determination module configured to determine a defrosting circuit based on a heat transfer path of the target heat source to the low-temperature radiator in the heat management system.

12. A vehicle, wherein, The heat management system according to any one of claims 1-3 and the defrosting control device according to claim 11.

13. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein, The processor executes the computer program to implement the steps of the defrosting control method according to any one of claims 4-10.

14. A computer readable storage medium having stored thereon a computer program, wherein, The program is executed by the processor to implement the steps of the defrosting control method according to any one of claims 4-10.

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