Waste heat recovery heat management system and method for vehicle

Abstract

The invention provides a waste heat recovery heat management system and method for a vehicle, and the system comprises an air conditioning device which comprises an air conditioning host (HVAC), a compressor and a condenser which are connected in sequence; one end of the heat exchange device is connected to the refrigerant input end of the compressor, and the other end of the heat exchange device is connected between the condenser and the HVAC; wherein when the condenser works, the HVAC, the compressor and the condenser form a refrigerating loop; and when the condenser does not work, a waste heat recovery loop is formed among the HVAC, the compressor, the condenser and the heat exchange device. The refrigerant is used for heating the surface of the evaporator and drying moisture in the evaporator and the air conditioner box, the humid environment in the air conditioner box is avoided, mold breeding is eradicated, and the problem that peculiar smell is generated when the air conditioner is started is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile air conditioning, and in particular to a waste heat recovery thermal management system and method for a vehicle. Background Art

[0002] Automobile air conditioning is referred to as automobile air conditioning. temperature , humidity , air cleanliness and air flow are adjusted and controlled in the best state, providing passengers with a comfortable riding environment and reducing travel fatigue; creating good working conditions for drivers, and playing an important role in ensuring safe driving. Generally, it includes refrigeration devices, heating devices and ventilation devices.

[0003] At present, when the car air conditioner is in cooling mode, the air temperature suddenly drops below the dew point temperature, and condensed water is easily precipitated in the air, attached to the surface of the evaporator, or dripping into the air conditioner box, causing the air conditioner box to be in a humid environment for a long time, which is easy to cause mold and accompanied by a sour smell. When the refrigerant temperature is around 0℃, the microorganisms in the air will be frozen on the surface of the evaporator. When the control strategy limits the compressor speed, the user actively exits or other factors cause the air conditioning system to shut down, the microorganisms will be thawed and blown out with the air conditioning wind, and the sour smell will cause discomfort to the user. Summary of the invention

[0004] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a waste heat recovery thermal management system and method for solving the problem of odor when the vehicle air conditioner is turned on, which is used to solve the problem that in the prior art, when the vehicle air conditioner is in refrigeration mode, the evaporator surface is in a wet state and microorganisms are frozen on the evaporator surface; when the air conditioning system is shut down, the microorganisms are thawed and blown out by the air conditioning wind, and the sour and smelly smell causes discomfort to the user.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a waste heat recovery heat management system for a vehicle, comprising: an air conditioning device, the air conditioning device comprising an air conditioning main unit (HVAC), a compressor and a condenser connected in sequence; and a heat exchange device, one end of the heat exchange device is connected to the refrigerant input end of the compressor, and the other end of the heat exchange device is connected between the condenser and the HVAC; wherein, when the condenser is working, the HVAC, the compressor, and the condenser form a refrigeration circuit; when the condenser is not working, a waste heat recovery circuit is formed between the HVAC, the compressor, the condenser and the heat exchange device, and the refrigerant flows through the HVAC to release heat, and then flows into the heat exchange device and returns to the compressor.

[0006] In one embodiment of the present invention, a first solenoid valve (SOV1) is connected between the HVAC and the compressor, a first electronic expansion valve (EXV1) and a second solenoid valve (SOV2) are connected in sequence between the HVAC and the condenser, a third electronic expansion valve (EXV3) is connected between the HVAC and the first solenoid valve (SOV1), one end of the third electronic expansion valve (EXV3) is connected to the first solenoid valve (SOV1) and the HVAC, and the other end of the third electronic expansion valve (EXV3) is connected to the condenser and the second solenoid valve (SOV2).

[0007] In one embodiment of the present invention, the heat exchange device includes: a heat exchange component (Chiller), one end of the Chiller is connected to the refrigerant input end of the compressor; and a second electronic expansion valve (EXV2), one end of the second electronic expansion valve (EXV2) is connected to the other end of the Chiller, and the other end of the second electronic expansion valve (EXV2) is connected between the first electronic expansion valve (EXV1) and the second solenoid valve (SOV2), so as to form a waste heat recovery circuit and allow the refrigerant to absorb heat through the Chiller when the first solenoid valve (SOV1) and the second solenoid valve (SOV2) are closed, the third electronic expansion valve (EXV3) is cut off, the first electronic expansion valve (EXV1) is fully opened and the second electronic expansion valve (EXV2) is cut off.

[0008] In one embodiment of the present invention, the condenser is a water-cooled condenser or an air-cooled condenser.

[0009] In one embodiment of the present invention, the HVAC includes: an evaporation unit (F-EVAP); and a blower (Blower), the blower (Blower) and the evaporation unit (F-EVAP) are installed correspondingly so that when a waste heat recovery loop is formed, the blower (Blower) is controlled by a control device to blow air to the evaporation unit (F-EVAP).

[0010] In one embodiment of the present invention, when the temperature of the refrigerant flowing through the HVAC is 10-20° C. higher than the temperature in the vehicle cabin, the blower blows and dries the evaporation unit (F-EVAP) when a waste heat recovery loop is formed.

[0011] In one embodiment of the present invention, a control device is further included, which is electrically connected to the first solenoid valve (SOV1), the second solenoid valve (SOV2), the first electronic expansion valve (EXV1), the third electronic expansion valve (EXV3), and the heat exchange device, respectively, so as to control the first solenoid valve (SOV1) and the second solenoid valve (SOV2) to open, control the second electronic expansion valve (EXV2) and the third electronic expansion valve (EXV3) to close, and control the first electronic expansion valve (EXV1) to cut off when forming a refrigeration circuit, and control the first solenoid valve (SOV1) and the second solenoid valve (SOV2) to close, control the third electronic expansion valve (EXV3) to cut off, control the first electronic expansion valve (EXV1) to fully open, and control the second electronic expansion valve (EXV2) to cut off when forming a waste heat recovery circuit.

[0012] In one embodiment of the present invention, the control device includes: a cabin signal acquisition unit, which collects loop control signals when the vehicle cabin is unmanned; a heat dissipation control unit, which controls the condenser to stop dissipating heat when the loop control signal is collected; and a loop control unit; the loop control unit controls the mutual switching between the refrigeration loop and the waste heat recovery loop.

[0013] In one embodiment of the present invention, the loop control unit includes: a temperature monitoring module, which collects a temperature control signal when the temperature difference between the temperature of the refrigerant about to enter the HVAC and the temperature in the cabin does not reach a predetermined temperature difference; and a pressure control module, which controls the cut-off pressure of the third electronic expansion valve (EXV3) on the refrigerant according to the temperature control signal until the temperature difference reaches a predetermined temperature difference.

[0014] In one embodiment of the present invention, the predetermined temperature difference ranges from 10 to 20°C.

[0015] The present invention also provides a waste heat recovery heat management method for the above waste heat recovery heat management system, comprising the following steps:

[0016] S1: Collect the waste heat recovery control signal when the air conditioning refrigeration circuit is closed and the circuit control signal when there is no one in the vehicle cabin;

[0017] S2: According to the waste heat recovery control signal and the loop control signal, the condenser is shut down, SOV1 and SOV2 are closed, EXV3 is cut off, EXV1 is fully opened, and EXV2 is cut off to form a waste heat recovery loop;

[0018] S3: Monitor the temperature data of the equipment to be cooled corresponding to the cooling device, and determine whether the temperature data exceeds the preset requirements. If exceeded, control the refrigerant to be intercepted through EXV2, so that the refrigerant flowing through the heat exchange device absorbs the heat of the cooling device, and then returns to the compressor. If not exceeded, control the refrigerant to be intercepted through EXV2 and directly return to the compressor.

[0019] In one embodiment of the present invention, in S3, judging whether the temperature data exceeds the preset requirements includes: judging whether the circulating water temperature reaches the preset temperature to control the refrigerant to absorb the heat of the circulating water, and judging whether the temperature of the circulating water after the refrigerant absorbs heat meets the water inlet requirements of the equipment to be cooled.

[0020] As described above, a waste heat recovery heat management system for a vehicle of the present invention has the following beneficial effects: a control device is used to control the circulation loop between HVAC, compressor, condenser and heat exchange device, so that when the condenser is in working state, the refrigerant in the condenser releases heat, and the refrigerant enters the evaporation unit of HVAC again to achieve the refrigerant absorption of heat, thereby forming a refrigeration loop to create a refrigeration environment in the cabin. When the condenser is not working, a waste heat recovery loop will be formed through HVAC, compressor, condenser and heat exchange device. When the refrigerant passes through the condenser, the condenser does not exchange heat, and when it reaches the HVAC, the refrigerant temperature is higher than the predetermined value of the cabin temperature by controlling the EXV3 cut-off pressure, thereby achieving the drying of the inner wall of the HVAC when the refrigerant passes through the HVAC, so as to achieve the removal of the condensed water formed on the evaporator core in the HVAC when the refrigeration function is turned off. Moreover, when drying the condensed water on the evaporator core, the water in the air duct and the shell of the air conditioner can be removed at the same time through the joint action of the blower, achieving a good drying effect and preventing the generation of odor. Moreover, when the refrigerant reaches the heat exchange device after passing through the HVAC, it determines whether the residual heat of the battery / motor or other components in the series water inlet of the vehicle exceeds the preset temperature. When the residual heat exceeds the preset temperature, the residual heat recovery control of the cooling device is realized when the refrigerant passes through the Chiller. When the residual heat does not exceed the preset temperature, the refrigerant does not exchange heat after passing through the Chiller and directly returns to the compressor. This reasonably reduces the load of the compressor and saves energy consumption in the entire drying process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. 4 is a schematic diagram of the thermal management system of the present invention.

[0022] Figure 2 It is a schematic diagram showing the working principle of the present invention when forming a refrigeration circuit.

[0023] Figure 3 Shown is a schematic diagram of the working principle of the present invention when a waste heat recovery loop is formed.

[0024] Figure 4 The figure is a flow chart of the thermal management method of the present invention. DETAILED DESCRIPTION

[0025] The following is an explanation of the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the features in the following embodiments and the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present invention are intended to describe specific embodiments, rather than to limit the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are usually carried out under conventional conditions or according to the conditions recommended by the manufacturers.

[0026] See also Figures 1 to 4 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0027] See also Figure 1 The present invention provides a waste heat recovery heat management system for a vehicle, comprising: an air conditioning device, the air conditioning device comprising an air conditioning main unit (HVAC), a compressor and a condenser connected in sequence; and a heat exchange device, one end of the heat exchange device is connected to the refrigerant input end of the compressor, and the other end of the heat exchange device is connected between the condenser and the HVAC; wherein, when the condenser is working, the HVAC, the compressor, and the condenser form a refrigeration circuit; when the condenser is not working, a waste heat recovery circuit is formed between the HVAC, the compressor, the condenser and the heat exchange device, and the refrigerant flows through the HVAC to release heat, and then flows into the heat exchange device and returns to the compressor.

[0028] In one embodiment of the present invention, during the cooling process of the air conditioner, a refrigeration circuit is formed between the HVAC, the compressor and the condenser, and when the condenser is working, the vehicle cabin is cooled. Among them, the HVAC is an air conditioner main unit with an evaporator. In this link, the evaporator is used for cooling and can realize the evaporation function. After the HVAC stops the cooling function, condensed water will be hung on the surface of the evaporator in the HVAC. By controlling the condenser to stop working, the refrigerant will not be processed when passing through the condenser. And a waste heat recovery loop is formed between the compressor, condenser, HVAC and the heat exchange device. When the refrigerant passes through the HVAC, heat is released, and then the surface of the evaporator will be heated by the refrigerant, thereby realizing the drying of the condensed water on the surface of the evaporator. And in this process, the evaporator in the HVAC is equivalent to being used as a condenser when the original condenser is not working. At the same time, by determining whether the battery / motor or other components in the vehicle's series water inlet circuit need to dissipate heat, the refrigerant passing through the heat exchange device is controlled to absorb the heat of the battery / motor or other components in the vehicle's series water inlet circuit, so as to achieve cooling treatment of the battery / motor or other components in the vehicle's series water inlet circuit.

[0029] like Figure 2 and 3 As shown, a first solenoid valve (SOV1) is connected between the HVAC and the compressor, a first electronic expansion valve (EXV1) and a second solenoid valve (SOV2) are connected in sequence between the HVAC and the condenser, a third electronic expansion valve (EXV3) is connected between the HVAC and the first solenoid valve (SOV1), one end of the third electronic expansion valve (EXV3) is connected to the first solenoid valve (SOV1) and the HVAC, and the other end of the third electronic expansion valve (EXV3) is connected to the condenser and the second solenoid valve (SOV2).

[0030] See also Figure 2 In the embodiment shown, when forming a refrigeration loop, the condenser works to dissipate heat, and both SOV1 and SOV2 are opened, EXV3 is closed, and EXV1 is cut off, so as to form a loop through the compressor, condenser, SOV2, HVAC, and SOV1, and blow cold air into the vehicle cabin through the HVAC.

[0031] See also Figure 3In the embodiment shown, when the waste heat recovery loop is formed, the condenser stops working, and the refrigerant passing through the compressor directly passes through the condenser without heat exchange, and enters the HVAC through EXV3 interception, and then enters the heat exchange device through EXV1 in the fully open state, and then returns to the compressor. When the heat exchange device releases heat to the refrigerant, if there are batteries / motors or other components in the series water inlet of the whole vehicle that need to dissipate heat, the refrigerant absorbs heat through the heat exchange device to realize the waste heat recovery cycle. When heat dissipation is not required, the refrigerant returns directly to the compressor without heat exchange.

[0032] like Figure 3 As shown, the heat exchange device includes: a heat exchange component (Chiller), one end of the Chiller is connected to the refrigerant input end of the compressor; and a second electronic expansion valve (EXV2), one end of EXV2 is connected to the other end of the Chiller, and the other end of EXV2 is connected between EXV1 and SOV2, so that when SOV1 and SOV2 are closed, EXV3 is cut off, EXV1 is fully opened and EXV2 is cut off, a waste heat recovery loop is formed, so that the refrigerant flowing through the Chiller absorbs heat released by the corresponding cooling device of the equipment to be cooled on the vehicle.

[0033] In one embodiment of the present invention, during the heat exchange process, the heat exchange device can intercept the flow through EXV2, and then pass through Chiller to achieve heat absorption treatment of the battery / motor or other components in the series water inlet of the whole vehicle, and then transport the heat-absorbed refrigerant to the compressor for circulation. For example, after the vehicle has just traveled at high speed or a certain speed, the water temperature of the battery water circulation is higher than 35°C. By opening the EXV2 interception, the refrigerant flowing through the Chiller recovers the waste heat of the battery water circulation to achieve cooling of the battery. Moreover, the heat recovered by the refrigerant flowing through the Chiller can also be used to dry the condensed water on the HVAC evaporator in a heat-releasing manner.

[0034] The heat exchange device also includes: a cooling device, which includes a water circulation unit that controls the heat release of the refrigerant flowing through the chiller. When the vehicle's equipment to be cooled needs to dissipate heat, it is cooled by the cooling device corresponding to each equipment to be cooled. The water circulation unit of the cooling device absorbs the heat dissipated from the vehicle's equipment to be cooled to achieve the purpose of cooling the equipment to be cooled. The heat of the water circulation further reaches the chiller, and the heat of the water circulation is absorbed by the refrigerant flowing through the chiller. When cooling the vehicle battery, the cooling device can be a battery cooling device.

[0035] The condenser is a water-cooled condenser or an air-cooled condenser.

[0036] In one embodiment of the present invention, when the condenser is subjected to heat dissipation, the heat dissipation may be performed by air cooling or water cooling. For example, when the condenser is an air-cooled condenser, the condensing fan is turned on; when the evaporator stops the cooling function, the condensing fan is not turned on at this time. For example, a vehicle model equipped with AGS can close the front air intake, and the condenser has no heat dissipation. When it is a water-cooled condenser, the condensing water pump is turned on or off to achieve heat dissipation control of the condenser. Of course, it is not limited to using air cooling and water cooling at the same time to cool the condenser to achieve heat dissipation of the condenser.

[0037] The HVAC includes: an evaporation unit (F-EVAP); and a blower (Blower), the blower (Blower) and the evaporation unit (F-EVAP) are installed correspondingly, so that when a waste heat recovery loop is formed, the blower (Blower) is controlled by a control device to blow air to the evaporation unit (F-EVAP).

[0038] In one embodiment of the present invention, both the F-EVAP and the blower have two usage modes. When forming a refrigeration circuit, the refrigerant in the F-EVAP absorbs heat, and in this process, the blower blows toward the F-EVAP, blowing cold air into the cabin to achieve cooling in the cabin. When the F-EVAP turns off refrigeration and has condensed water, the blower acts on the F-EVAP by blowing air, and cooperates with the heat release of the refrigerant to fully dry the condensed water formed on the F-EVAP tube wall.

[0039] When the temperature of the refrigerant flowing through the HVAC is 10-20°C higher than the temperature in the vehicle cabin, the blower blows and dries the evaporative unit (F-EVAP) when the waste heat recovery loop is formed.

[0040] In one embodiment of the present invention, when the HVAC is used as a condenser and the refrigerant passes through the condenser corresponding to the heat dissipation component, the heat dissipation component is in a stopped state. Therefore, there is no heat exchange in the condenser corresponding to the heat dissipation component. After that, the refrigerant is intercepted by EXV3 to control the refrigerant pressure entering the evaporator so that the corresponding saturation temperature under this pressure is 10-20°C higher than the temperature in the cabin. This forms a temperature difference between the refrigerant at the HVAC and the cabin, thereby achieving the heat release condition of the refrigerant at the HVAC, and then drying the condensed water on the inner wall of the HVAC.

[0041] The invention further comprises a control device, which is electrically connected to the first solenoid valve (SOV1), the second solenoid valve (SOV2), the first electronic expansion valve (EXV1), the third electronic expansion valve (EXV3), and the heat exchange device, respectively, so as to control the first solenoid valve (SOV1) and the second solenoid valve (SOV2) to open, control the second electronic expansion valve (EXV2) and the third electronic expansion valve (EXV3) to close, and control the first electronic expansion valve (EXV1) to cut off flow when forming a refrigeration circuit, and control the first solenoid valve (SOV1) and the second solenoid valve (SOV2) to close, control the third electronic expansion valve (EXV3) to cut off flow, control the first electronic expansion valve (EXV1) to fully open, and control the second electronic expansion valve (EXV2) to cut off flow when forming a waste heat recovery circuit.

[0042] In one embodiment of the present invention, a control device is used to control SOV1, SOV2, EXV1, EXV3, and a heat exchange device. When a refrigeration circuit needs to be formed, SOV1 and SOV2 are opened, EXV2 and EXV3 are closed, and EXV1 is cut off while controlling the condenser to work, thereby forming a refrigeration circuit. After the refrigeration function is turned off, the condenser is controlled to stop, and under the premise that the condenser does not exchange any refrigerant, SOV1 and SOV2 are controlled to be closed, EXV3 is cut off, and EXV1 is fully opened to form a waste heat recovery circuit, and determine whether it is necessary to perform heat dissipation treatment on the vehicle's equipment to be cooled, so as to determine whether the cooling device that absorbs the heat of the vehicle's equipment to be cooled absorbs heat when the refrigerant passes through the Chiller.

[0043] The control device includes: a cockpit signal acquisition unit, which collects loop control signals when the vehicle cockpit is unmanned; a heat dissipation control unit, which controls the condenser to stop dissipating heat when the loop control signal is collected; and a loop control unit; the loop control unit controls the mutual switching between the refrigeration loop and the waste heat recovery loop.

[0044] In one embodiment of the present invention, during the process of controlling the formation of a refrigeration circuit or a waste heat recovery circuit, after the vehicle turns off the refrigeration circuit, the control device uses the cabin signal acquisition module to collect the circuit control signal when no one is in the cabin. For example, the gravity sensor is used to collect whether the seats in the cabin have the corresponding sitting weight, etc. When the circuit control signal is collected, the heat dissipation control unit is used to stop the condenser from exchanging heat with the refrigerant. And the circuit control unit is used to switch the original refrigeration circuit to a waste heat recovery circuit. And determine whether it is necessary to dissipate heat for the battery / motor or other components in the series water inlet of the whole vehicle, so as to determine whether the heat of the water inlet is absorbed when the refrigerant passes through the Chiller.

[0045] The loop control unit includes: a temperature monitoring module, which collects a temperature control signal when the temperature difference between the refrigerant temperature about to enter the HVAC and the temperature in the cabin does not reach a predetermined temperature difference; and a pressure control module, which controls the cut-off pressure of the refrigerant by the third electronic expansion valve (EXV3) according to the temperature control signal until the temperature difference reaches a predetermined temperature difference.

[0046] In one embodiment of the present invention, after the circuit control unit switches the refrigeration circuit to the waste heat recovery circuit, it monitors the temperature of the refrigerant entering the HVAC and the temperature in the cabin at the same time, thereby obtaining the temperature difference between the two. When the temperature difference does not reach the predetermined temperature difference, a temperature control signal is collected to control the cut-off pressure of EXV3 through the pressure control module to adjust the refrigerant temperature so that the temperature difference reaches the predetermined temperature difference.

[0047] The range of the predetermined temperature difference is 10-20° C. That is, the cut-off pressure of EXV3 needs to be controlled so that when the temperature difference between the refrigerant temperature and the cabin temperature is adjusted to 10-20° C., the refrigerant can release heat to the inner wall of the HVAC to achieve drying of the inner wall of the HVAC.

[0048] like Figure 4 As shown, the present invention also provides a waste heat recovery heat management method for solving the problem of odor when turning on the air conditioner, comprising the following steps:

[0049] S1: Collect the waste heat recovery control signal when the air conditioning refrigeration circuit is closed and the circuit control signal when there is no one in the vehicle cabin;

[0050] S2: According to the waste heat recovery control signal and the loop control signal, the condenser is shut down, SOV1 and SOV2 are closed, EXV3 is cut off, EXV1 is fully opened, and EXV2 is cut off to form a waste heat recovery loop;

[0051] S3: Monitor the temperature data of the equipment to be cooled corresponding to the cooling device, and determine whether the temperature data exceeds the preset requirements. If exceeded, control the refrigerant to be intercepted through EXV2, so that the refrigerant flowing through the heat exchange device absorbs the heat of the cooling device, and then returns to the compressor. If not exceeded, control the refrigerant to be intercepted through EXV2 and directly return to the compressor.

[0052] In one embodiment of the present invention, when the air conditioning waste heat recovery is performed, when the cooling in the cabin is stopped, the waste heat recovery control signal is collected when it is stopped, and the loop control signal in the cabin of the vehicle is collected when no one is in it. The loop control signal collection in the unmanned state can be collected by collecting the sensing signal of the gravity sensor of the seat in the cabin. Through the waste heat recovery control signal and the loop control signal, the condenser is controlled to stop, so that the refrigerant does not exchange any heat when passing through the condenser, and SOV1 and SOV2 are closed, EXV3 is intercepted, and EXV1 is fully opened to form a waste heat recovery loop. In this process, the evaporation unit of the HVAC will switch from the original evaporation function to the condensation function, and release heat to the inner wall of the HVAC. Thereby, the condensed water drying treatment of the inner wall of the HVAC can be achieved. And after the refrigerant releases heat through the HVAC, EXV2 is controlled to be intercepted. When it is determined that the temperature of the equipment to be cooled (i.e., the battery / motor or other components in the vehicle's other series water inlet) is higher than the preset requirement (for example, when the vehicle has just driven at high speed or a certain speed, the battery water temperature is higher than 35°C or a certain value), the refrigerant will be controlled to absorb the heat of the cooling device corresponding to the equipment to be cooled when passing through the Chiller, so as to achieve the cooling treatment of the equipment to be cooled, and continue to return to the compressor after the refrigerant absorbs the heat. When it is monitored that the temperature of the equipment to be cooled does not exceed the preset requirement, the refrigerant is controlled to return directly to the compressor without absorbing heat from the cooling device when passing through the Chiller.

[0053] In step S3, judging whether the temperature data exceeds the preset requirements includes: judging whether the circulating water temperature reaches the preset temperature, so as to control the refrigerant to absorb the heat of the circulating water, and judging whether the temperature of the circulating water after the refrigerant absorbs the heat meets the water entry requirements of the equipment to be cooled. When judging that the circulating water temperature reaches the preset temperature, it is necessary to control the refrigerant to absorb the heat in the circulating water absorbed by the equipment to be cooled. And it is also necessary to further judge whether the temperature of the circulating water after the heat is absorbed meets the requirements of the equipment to be cooled for continued cooling.

[0054] In summary, the present invention controls the circulation loop between HVAC, compressor, condenser and heat exchange device through the control device, so that when the condenser is in working state, the refrigerant in the condenser releases heat, and the refrigerant enters the evaporation unit of HVAC again to achieve the refrigerant absorption of heat, thereby forming a refrigeration circuit to create a refrigeration environment in the cabin. When the condenser is not working, a waste heat recovery loop will be formed through HVAC, compressor, condenser and heat exchange device. When the refrigerant passes through the condenser, the condenser does not exchange heat, and when it reaches the HVAC, the EXV3 cut-off pressure is controlled to make the refrigerant temperature higher than the preset value of the cabin temperature, thereby achieving the drying of the inner wall of the HVAC when the refrigerant passes through the HVAC, so as to achieve the removal of the condensed water formed on the evaporator core in the HVAC when the refrigeration function is turned off. Moreover, when drying the condensed water on the evaporator core, the water in the air duct and shell of the air conditioner can be removed at the same time through the joint action of the blower, achieving a good drying effect and preventing the generation of odor. Moreover, when the refrigerant reaches the heat exchange device after passing through the HVAC, it determines whether the residual heat of the battery / motor or other parts in the series water inlet of the vehicle exceeds the preset temperature. When the residual heat exceeds the preset temperature, the residual heat recovery control of the cooling device is realized when the refrigerant passes through the Chiller. When the residual heat does not exceed the preset temperature, the refrigerant does not exchange heat after passing through the Chiller and directly returns to the compressor. Thereby, the load of the compressor is reasonably reduced, and the energy consumption of the entire drying process is saved. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0055] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A waste heat recovery thermal management system for a vehicle, characterized in that: include: An air conditioning device, the air conditioning device comprising an air conditioning host (HVAC), a compressor and a condenser connected in sequence; as well as a heat exchange device, one end of which is connected to the refrigerant input end of the compressor, and the other end of which is connected between the condenser and the HVAC; Among them, when the condenser is working, the HVAC, the compressor, and the condenser form a refrigeration circuit; when the condenser is not working, a waste heat recovery circuit is formed among the HVAC, the compressor, the condenser and the heat exchange device, and the refrigerant flows through the HVAC to release heat, then flows into the heat exchange device and then returns to the compressor.

2. The waste heat recovery thermal management system for a vehicle according to claim 1, characterized in that: A first solenoid valve (SOV1) is connected between the HVAC and the compressor, a first electronic expansion valve (EXV1) and a second solenoid valve (SOV2) are connected in sequence between the HVAC and the condenser, a third electronic expansion valve (EXV3) is connected between the HVAC and the first solenoid valve (SOV1), one end of the third electronic expansion valve (EXV3) is connected to the first solenoid valve (SOV1) and the HVAC, and the other end of the third electronic expansion valve (EXV3) is connected to the condenser and the second solenoid valve (SOV2).

3. The waste heat recovery thermal management system for a vehicle according to claim 2, characterized in that: The heat exchange device comprises: a heat exchange component (Chiller), one end of which is connected to the refrigerant input end of the compressor; and A second electronic expansion valve (EXV2), one end of the second electronic expansion valve (EXV2) is connected to the other end of the Chiller, and the other end of the second electronic expansion valve (EXV2) is connected between the first electronic expansion valve (EXV1) and the second solenoid valve (SOV2), so as to form the waste heat recovery circuit and allow the refrigerant to absorb heat through the Chiller when the first solenoid valve (SOV1) and the second solenoid valve (SOV2) are closed, the third electronic expansion valve (EXV3) is cut off, the first electronic expansion valve (EXV1) is fully opened, and the second electronic expansion valve (EXV2) is cut off.

4. The waste heat recovery thermal management system for a vehicle according to claim 1, characterized in that: The condenser is a water-cooled condenser or an air-cooled condenser.

5. The waste heat recovery thermal management system for a vehicle according to claim 2, characterized in that: The HVAC includes: Evaporative unit (F-EVAP); and A blower (Blower), wherein the blower (Blower) is installed corresponding to the evaporation unit (F-EVAP) so that when the waste heat recovery loop is formed, the blower (Blower) is controlled by the control device to blow air to the evaporation unit (F-EVAP).

6. The waste heat recovery thermal management system for a vehicle according to claim 5, characterized in that: When the temperature of the refrigerant flowing through the HVAC is 10-20° C. higher than the temperature in the vehicle cabin, the blower blows and dries the evaporation unit (F-EVAP) when the waste heat recovery loop is formed.

7. The waste heat recovery thermal management system for a vehicle according to claim 3, characterized in that: The invention further comprises a control device, which is electrically connected to the first solenoid valve (SOV1), the second solenoid valve (SOV2), the first electronic expansion valve (EXV1), the third electronic expansion valve (EXV3), and the heat exchange device, respectively, so as to control the first solenoid valve (SOV1) and the second solenoid valve (SOV2) to open, control the second electronic expansion valve (EXV2) and the third electronic expansion valve (EXV3) to close, and control the first electronic expansion valve (EXV1) to cut off flow when forming the refrigeration circuit, and control the first solenoid valve (SOV1) and the second solenoid valve (SOV2) to close, control the third electronic expansion valve (EXV3) to cut off flow, control the first electronic expansion valve (EXV1) to be fully opened, and control the second electronic expansion valve (EXV2) to cut off flow when forming the waste heat recovery circuit.

8. The waste heat recovery thermal management system for a vehicle according to claim 7, characterized in that: The control device comprises: A cockpit signal acquisition unit, which collects loop control signals when the vehicle cockpit is unmanned; a heat dissipation control unit, wherein the heat dissipation control unit controls to stop heat dissipation of the condenser when the loop control signal is collected; and Circuit control unit; the circuit control unit controls the switching between the refrigeration circuit and the waste heat recovery circuit.

9. The waste heat recovery thermal management system for a vehicle according to claim 8, characterized in that: The loop control unit comprises: A temperature monitoring module, the temperature monitoring module collecting a temperature control signal that a temperature difference between the temperature of the refrigerant about to enter the HVAC and the temperature in the cabin does not reach a predetermined temperature difference; and A pressure control module, wherein the pressure control module controls the cut-off pressure of the third electronic expansion valve (EXV3) on the refrigerant according to the temperature control signal until the temperature difference reaches the predetermined temperature difference.

10. The waste heat recovery thermal management system for a vehicle according to claim 9, characterized in that: The predetermined temperature difference ranges from 10 to 20°C.

11. A waste heat recovery heat management method for a waste heat recovery heat management system according to any one of claims 1 to 10, characterized in that: The steps include: S1: Collect the waste heat recovery control signal when the air conditioning refrigeration circuit is closed and the circuit control signal when there is no one in the vehicle cabin; S2: According to the waste heat recovery control signal and the loop control signal, the condenser is shut down, SOV1 and SOV2 are closed, EXV3 is cut off, EXV1 is fully opened, and EXV2 is cut off, so as to form a waste heat recovery loop; S3: Monitor the temperature data of the equipment to be cooled corresponding to the cooling device, and determine whether the temperature data exceeds the preset requirements. If exceeded, control the refrigerant to pass through the EXV2 to intercept, so that the refrigerant flowing through the heat exchange device absorbs the heat of the cooling device, and then returns to the compressor. If not exceeded, control the refrigerant to pass through the EXV2 to intercept and directly return to the compressor.

12. The waste heat recovery thermal management method for a vehicle according to claim 11, characterized in that: In S3, judging whether the temperature data exceeds the preset requirement includes: judging whether the circulating water temperature reaches the preset temperature to control the refrigerant to absorb the heat of the circulating water, and judging whether the temperature of the circulating water after the refrigerant absorbs heat meets the water inlet requirement of the equipment to be cooled.

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