Commercial vehicle double-compressor thermal management system and control method thereof

Abstract

The invention relates to the technical field of vehicle-mounted compressors, and provides a commercial vehicle double-compressor heat management system and a control method thereof. Comprising a main compressor, an outdoor heat exchanger, a first heat exchanger and a fourth heat exchanger which are connected through a refrigerant pipeline; the second refrigerant loop comprises an auxiliary compressor, a condenser and a third heat exchanger which are sequentially connected through a refrigerant pipeline; the battery cooling liquid loop comprises a battery and a second heat exchanger which are connected through a cooling liquid pipeline; the air conditioner warm air loop comprises a warm air water pump, a warm air core body and a three-way water valve. The first heat exchanger is used for heat exchange between the first refrigerant loop and the battery cooling liquid loop, the second heat exchanger is used for heat exchange between the battery cooling liquid loop and the air conditioner warm air loop, and the third heat exchanger is used for heat exchange between the second refrigerant loop and the battery cooling liquid loop. And frequent starting and stopping caused by frosting of the compressor are avoided, the heat loss is reduced, and the COP value of the heat management system is increased.

Description

Technical Field

[0001] This application relates to the field of vehicle compressor technology, specifically to a dual-compressor thermal management system for commercial vehicles and its control method. Background Technology

[0002] Currently, commercial vehicles use single-compressor heat pump or non-heat pump systems, and battery cooling is achieved through liquid cooling. During refrigeration, the compressor is used to exchange heat between the evaporator in the passenger compartment and the battery panels. For insufficient cooling capacity, the compressor displacement is usually increased to compensate.

[0003] Increasing the compressor displacement is a simple method with minimal impact on the thermal management system, requiring no additional system components. However, it presents two main challenges: 1. The compressor has a minimum speed. Under the condition of low heat load in the passenger compartment, even if the compressor runs at the minimum speed, there is still an excess of cooling capacity. This causes the actual evaporator temperature to be lower than the target temperature, and even frost may form. This triggers the frost protection, causing the compressor to start and stop frequently or even shut down. If the heat is distributed to the battery, there will be a waste of energy. 2. When the vehicle load is high, especially when fast charging causes the battery to heat up too quickly, resulting in a higher compressor speed, according to the compressor speed vs. COP map, a higher speed results in a lower COP value and higher energy consumption. Summary of the Invention

[0004] In view of this, embodiments of this application provide a dual-compressor thermal management system and its control method for commercial vehicles to solve the problems of frequent start-stop, energy waste, and low COP value caused by compressor frosting in the prior art.

[0005] The first aspect of this application provides a dual-compressor thermal management system for commercial vehicles, comprising: The first refrigerant circuit includes a main compressor, an outdoor heat exchanger, a first heat exchanger, and a fourth heat exchanger connected by refrigerant piping. The second refrigerant circuit includes an auxiliary compressor, a condenser, and a third heat exchanger connected in sequence via refrigerant piping. The battery coolant circuit includes a battery and a second heat exchanger connected via coolant piping. The air conditioning heating circuit includes a heating water pump, a heating core, and a three-way water valve connected by a coolant pipeline; The first heat exchanger is used for heat exchange between the first refrigerant circuit and the battery coolant circuit; the second heat exchanger is used for heat exchange between the battery coolant circuit and the air conditioning heating circuit; and the third heat exchanger is used for heat exchange between the second refrigerant circuit and the battery coolant circuit.

[0006] In one embodiment, the first refrigerant circuit further includes a first electronic expansion valve, an evaporator, a second electronic expansion valve, a fourth electronic expansion valve, and a two-way shut-off valve; The outlet end of the main compressor is sequentially connected to the hot side of the fourth heat exchanger, the fourth electronic expansion valve, the outdoor heat exchanger, the first electronic expansion valve, and the evaporator. The evaporator is connected to the inlet end of the main compressor. One end of the cold side of the first heat exchanger is connected to the inlet end of the main compressor, and the other end is connected to one end of the second electronic expansion valve. The other end of the second electronic expansion valve is connected to the outlet end of the outdoor heat exchanger. The bidirectional shut-off valve is connected between the outlet end of the outdoor heat exchanger and the inlet end of the main compressor. The cold side of the fourth heat exchanger is connected to the air conditioning heating circuit, and the hot side of the first heat exchanger is connected to the battery coolant circuit.

[0007] In one embodiment, the battery coolant circuit further includes a battery water pump and a two-way valve. One cold end of the second heat exchanger is connected to the outlet end of the battery water pump, and the other end is connected to the coolant inlet end of the battery. The coolant outlet end of the battery is connected to the inlet end of the battery water pump in sequence through the two-way valve and the hot side of the third heat exchanger. The coolant outlet end of the battery is connected to the inlet end of the battery water pump through the hot side of the first heat exchanger. The hot side of the second heat exchanger is connected to the air conditioning heating circuit.

[0008] In one embodiment, the three-way water valve of the air conditioning heating circuit is used to connect the first port and the second port, or the first port and the third port; When the first port of the three-way water valve is connected to the second port, the air conditioning heating circuit exchanges heat with the first refrigerant circuit and the battery coolant circuit; When the first port of the three-way water valve is connected to the third port, the air conditioning heating circuit exchanges heat with the first refrigerant circuit.

[0009] A second aspect of this application provides a control method for a dual-compressor thermal management system for commercial vehicles as described in any one of claims 1 to 4, characterized in that it includes: The system's operating mode is determined based on at least one of the following: crew cabin cooling requirements, crew cabin heating requirements, battery cooling requirements, and battery heating requirements. Based on the aforementioned operating mode, the operating status of at least one of the first refrigerant circuit, the second refrigerant circuit, the battery coolant circuit, and the air conditioning heating circuit is controlled.

[0010] In one embodiment, the operating mode includes a situation where the occupant cabin requires cooling but the battery does not, and the control includes: The fan, main compressor, first electronic expansion valve, and fourth electronic expansion valve of the first refrigerant circuit are turned on, while the second electronic expansion valve and the two-way shut-off valve are turned off. The third electronic expansion valve controlling the second refrigerant circuit opens, and the auxiliary compressor closes; The two-way valve controlling the battery coolant circuit and the battery water pump are shut off; The heating water pump controlling the air conditioning heating circuit is turned off, and the three-way water valve is connected to the first port and the third port; The rotational speed of the main compressor is controlled by the evaporation temperature of the evaporator.

[0011] In one embodiment, the operating mode includes situations where the crew cabin requires cooling and the battery requires cooling, and the control includes: If the battery temperature is lower than the first set temperature: The fan, main compressor, first electronic expansion valve, and fourth electronic expansion valve of the first refrigerant circuit are turned on, while the second electronic expansion valve and the two-way shut-off valve are turned off. The auxiliary compressor and the third electronic expansion valve of the second refrigerant circuit are opened; The two-way valve controlling the battery coolant circuit and the battery water pump are turned on; The heating water pump controlling the air conditioning heating circuit is turned off, and the three-way water valve is connected to the first port and the third port; The main compressor's rotational speed is controlled by the evaporator's evaporation temperature, while the auxiliary compressor's rotational speed is controlled by the battery inlet coolant temperature. If the battery temperature is higher than the first set temperature: The fan, main compressor, first electronic expansion valve, second electronic expansion valve and fourth electronic expansion valve of the first refrigerant circuit are turned on, and the two-way shut-off valve is turned off; The auxiliary compressor and the third electronic expansion valve of the second refrigerant circuit are opened; The two-way valve controlling the battery coolant circuit and the battery water pump are turned on; The heating water pump controlling the air conditioning heating circuit is turned off, and the three-way water valve is connected to the first port and the third port; The main compressor's rotational speed is controlled by the evaporator's evaporation temperature, while the auxiliary compressor's rotational speed is controlled by the battery inlet coolant temperature.

[0012] In one embodiment, the operating mode includes a situation where the occupant cabin has no cooling requirement and the battery has a cooling requirement, and the control includes: If the battery temperature is lower than the first set temperature: The main compressor controlling the first refrigerant circuit is shut down, while the fan, the first electronic expansion valve, the second electronic expansion valve, and the fourth electronic expansion valve are opened; The auxiliary compressor and the third electronic expansion valve of the second refrigerant circuit are opened; The two-way valve controlling the battery coolant circuit and the battery water pump are turned on; The heating water pump controlling the air conditioning heating circuit is turned off, and the three-way water valve is connected to the first port and the third port; The rotational speed of the auxiliary compressor is controlled by the battery inlet coolant temperature. If the battery temperature is higher than the first set temperature: The fan, main compressor, second electronic expansion valve, and fourth electronic expansion valve of the first refrigerant circuit are turned on, and the first electronic expansion valve is turned off; The auxiliary compressor and the third electronic expansion valve of the second refrigerant circuit are opened; The two-way valve controlling the battery coolant circuit and the battery water pump are turned on; The heating water pump controlling the air conditioning heating circuit is turned off, and the three-way water valve is connected to the first port and the third port; The main compressor's rotational speed is controlled by the battery inlet coolant temperature, while the auxiliary compressor's rotational speed is controlled by the battery inlet coolant temperature plus a calibration value.

[0013] In one embodiment, the operating mode includes situations where the crew cabin requires heating and the battery requires cooling, and the control includes: The fan, main compressor, fourth electronic expansion valve, and two-way shut-off valve of the first refrigerant circuit are turned on, while the first electronic expansion valve and the second electronic expansion valve are turned off. The auxiliary compressor and the third electronic expansion valve of the second refrigerant circuit are opened; The two-way valve controlling the battery coolant circuit and the battery water pump are turned on; The heating water pump controlling the air conditioning heating circuit is turned on, and the three-way water valve is connected to the first port and the third port; The main compressor's rotational speed is controlled by the water temperature of the heater core, while the auxiliary compressor's rotational speed is controlled by the battery inlet coolant temperature.

[0014] In one embodiment, the operating mode includes a situation where the occupant cabin has no need for heating and the battery has a heating need, and the control includes: The fan, main compressor, fourth electronic expansion valve, and two-way shut-off valve of the first refrigerant circuit are turned on, while the first electronic expansion valve and the second electronic expansion valve are turned off. The auxiliary compressor controlling the second refrigerant circuit is shut down, and the third electronic expansion valve is opened; The two-way valve controlling the battery coolant circuit is closed, and the battery water pump is turned on; The heating water pump controlling the air conditioning heating circuit is turned on, and the three-way water valve is connected to the first port and the second port; The rotational speed of the main compressor is controlled by the temperature of the battery inlet coolant.

[0015] In one embodiment, the operating mode includes situations where the crew cabin requires heating but the battery does not, and the control includes: The fan, main compressor, fourth electronic expansion valve, and two-way shut-off valve of the first refrigerant circuit are turned on, while the first electronic expansion valve and the second electronic expansion valve are turned off. The auxiliary compressor controlling the second refrigerant circuit is shut down, and the third electronic expansion valve is opened; The two-way valve controlling the battery coolant circuit opens, and the battery water pump shuts off; The heating water pump controlling the air conditioning heating circuit is turned on, and the three-way water valve is connected to the first port and the third port; The rotational speed of the main compressor is controlled by the water temperature of the heater core.

[0016] In one embodiment, the operating mode includes situations where the crew cabin requires heating and the battery requires heating, and the control includes: The fan, main compressor, fourth electronic expansion valve, and two-way shut-off valve of the first refrigerant circuit are turned on, while the first electronic expansion valve and the second electronic expansion valve are turned off. The auxiliary compressor controlling the second refrigerant circuit is shut down, and the third electronic expansion valve is opened; The two-way valve controlling the battery coolant circuit is closed, and the battery water pump is turned on; The heating water pump controlling the air conditioning heating circuit is turned on, and the three-way water valve is connected to the first port and the second port; The rotational speed of the main compressor is controlled by the water temperature of the heater core.

[0017] A third aspect of this application provides a new energy heavy-duty commercial vehicle, including a dual-compressor thermal management system as provided in the first aspect of this application.

[0018] The first aspect of this application provides a dual-compressor thermal management system for commercial vehicles, comprising: a first refrigerant circuit, including a main compressor, an outdoor heat exchanger, a first heat exchanger, and a fourth heat exchanger connected via refrigerant piping; a second refrigerant circuit, including an auxiliary compressor, a condenser, and a third heat exchanger connected sequentially via refrigerant piping; a battery coolant circuit, including a battery and a second heat exchanger connected via coolant piping; and an air conditioning heating circuit, including a heater pump, a heater core, and a three-way valve connected via coolant piping. The first heat exchanger is used for heat exchange between the first refrigerant circuit and the battery coolant circuit; the second heat exchanger is used for heat exchange between the battery coolant circuit and the air conditioning heating circuit; and the third heat exchanger is used for heat exchange between the second refrigerant circuit and the battery coolant circuit. The main compressor simultaneously cools both the passenger compartment and the battery coolant, while the auxiliary compressor cools the battery coolant separately. This avoids compressor shutdown and evaporator damage caused by evaporator frosting due to excessive minimum compressor cooling capacity. This ensures the compressor operates at the appropriate speed, improving its cooling efficiency and preventing heat loss caused by the compressor's minimum cooling capacity being allocated to the battery. It also increases the COP value of the thermal management system, reduces its energy consumption, and consequently improves the overall vehicle economy.

[0019] It is understood that the beneficial effects of the second and third aspects mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a dual-compressor thermal management system for commercial vehicles provided in an embodiment of this application. Detailed Implementation

[0022] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0023] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0024] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0026] like Figure 1 As shown in the embodiment of this application, a dual-compressor thermal management system for commercial vehicles includes: The first refrigerant circuit 100 includes a main compressor 1, an outdoor heat exchanger 2, a first heat exchanger 6, and a fourth heat exchanger 18 connected by refrigerant pipelines; The second refrigerant circuit 200 includes an auxiliary compressor 13, a condenser 14 and a third heat exchanger 15 connected in sequence via refrigerant pipelines; The battery coolant circuit 300 includes a battery 12 and a second heat exchanger 11 connected via coolant pipes; The air conditioning heating circuit 400 includes a heating water pump 19, a heating core 20, and a three-way water valve 17 connected by a coolant pipeline. The first heat exchanger 6 is used for heat exchange between the first refrigerant circuit 100 and the battery coolant circuit 300; the second heat exchanger 11 is used for heat exchange between the battery coolant circuit 300 and the air conditioning heating circuit 400; and the third heat exchanger 15 is used for heat exchange between the second refrigerant circuit 200 and the battery coolant circuit 300.

[0027] In this embodiment, the main compressor can simultaneously cool both the passenger compartment and the battery coolant, while the auxiliary compressor 13 cools the battery coolant separately. This avoids compressor shutdown and evaporator damage caused by evaporator frosting due to excessive compressor minimum cooling capacity. It ensures the compressor operates at an appropriate speed, improving its cooling efficiency and preventing heat loss caused by distributing the compressor's minimum cooling capacity to the battery. This increases the COP value of the thermal management system, reduces its energy consumption, and thus improves the overall vehicle economy.

[0028] In one embodiment, the first refrigerant circuit 100 further includes a fourth electronic expansion valve 8, a first electronic expansion valve 5, an evaporator 4, a second electronic expansion valve 7, and a two-way shut-off valve 9. The outlet end of the main compressor 1 is sequentially connected to the hot side of the fourth heat exchanger 18, the fourth electronic expansion valve 8, the outdoor heat exchanger 2, the first electronic expansion valve 5, and the evaporator 4. The evaporator 4 is connected to the inlet end of the main compressor 1. One end of the cold side of the first heat exchanger 6 is connected to the inlet end of the main compressor 1, and the other end is connected to one end of the second electronic expansion valve 7. The other end of the second electronic expansion valve 7 is connected to the outlet end of the outdoor heat exchanger 2. The two-way shut-off valve 9 is connected between the outlet end of the outdoor heat exchanger 2 and the inlet end of the main compressor 1. The cold side of the fourth heat exchanger 18 is connected to the air conditioning heating circuit 400, and the hot side of the first heat exchanger 6 is connected to the battery coolant circuit 300.

[0029] In the application, the fan 3 in the first refrigerant circuit 100 is arranged together with the outdoor heat exchanger 2, and the condenser 14 in the second refrigerant circuit 200. The fan 3 and the condenser 14 are located on both sides, and the outdoor heat exchanger 2 is located between them.

[0030] In one embodiment, the battery coolant circuit 300 further includes a battery water pump 10 and a two-way valve 21. One end of the cold side of the second heat exchanger 11 is connected to the outlet end of the battery water pump 10, and the other end is connected to the coolant inlet end of the battery 12. The coolant outlet end of the battery 12 is connected to the inlet end of the battery water pump 10 in sequence through the two-way valve 21 and the hot side of the third heat exchanger 15. The coolant outlet end of the battery 12 is connected to the inlet end of the battery water pump 10 through the hot side of the first heat exchanger 6. The hot side of the second heat exchanger 11 is connected to the air conditioning heating circuit 400.

[0031] In one embodiment, the three-way water valve 17 of the air conditioning heating circuit 400 is used to connect the first port and the second port, or the first port and the third port. When the first port of the three-way water valve 17 is connected to the second port, the air conditioning heating circuit 400 exchanges heat with the first refrigerant circuit 100 and the battery coolant circuit 300. When the first port of the three-way water valve 17 is connected to the third port, the air conditioning heating circuit 400 exchanges heat with the first refrigerant circuit 100.

[0032] In application, the three-way water valve 17 has a first port ①, a second port ②, and a third port ③. The three-way water valve 17 can be controlled by an upper-level control signal to select to connect the first port and the second port, or the first port and the third port.

[0033] In application, the dual-compressor thermal management system adopts a liquid-side parallel connection. The main and auxiliary compressors 13 cool the battery coolant through a heat exchanger. The first refrigerant circuit and the second refrigerant circuit are filled with refrigerant and are separate circuits. The battery coolant circuit and the air conditioning heating circuit are filled with coolant and are separate circuits.

[0034] This application also provides a control method for a dual-compressor thermal management system for commercial vehicles, including: The system's operating mode is determined based on at least one of the following: the crew cabin's cooling demand, the crew cabin's heating demand, the battery 12's cooling demand, and the battery 12's heating demand. Based on the operating mode, control the operating status of at least one of the first refrigerant circuit 100, the second refrigerant circuit 200, the battery coolant circuit 300, and the air conditioning heating circuit 400.

[0035] In one embodiment, the operating mode includes a cooling requirement in the occupant cabin but no requirement for battery 12, and the control includes: The fan, main compressor 1, first electronic expansion valve 5, and fourth electronic expansion valve 8 of the first refrigerant circuit 100 are turned on, while the second electronic expansion valve 7 and the two-way shut-off valve 9 are turned off. The third electronic expansion valve of the second refrigerant circuit 200 is opened, and the auxiliary compressor 13 is closed; The two-way valve 21 of the battery coolant circuit 300 and the battery water pump 10 are closed; The heating water pump 19 of the air conditioning heating circuit 400 is turned off, and the three-way water valve 17 is connected to the first port and the third port; The rotational speed of the main compressor 1 is controlled by the evaporation temperature of the evaporator 4.

[0036] In the application, the speed of the main compressor 1 is controlled by the evaporation temperature of the evaporator 4. The refrigerant flows through the outdoor heat exchanger 2 to transfer heat to the air. The refrigerant passes through the first electronic expansion valve 5 and absorbs heat from the passenger compartment through the evaporator 4.

[0037] In one embodiment, the operating mode includes a cooling requirement for both the crew cabin and the battery 12, and the control includes: If the temperature of battery 12 is lower than the first set temperature: The fan, main compressor 1, first electronic expansion valve 5, and fourth electronic expansion valve 8 of the first refrigerant circuit 100 are turned on, while the second electronic expansion valve 7 and the two-way shut-off valve 9 are turned off. The auxiliary compressor 13 and the third electronic expansion valve of the second refrigerant circuit 200 are opened; The two-way valve 21 of the battery coolant circuit 300 and the battery water pump 10 are opened; The heating water pump 19 of the air conditioning heating circuit 400 is turned off, and the three-way water valve 17 is connected to the first port and the third port; Among them, the speed of the main compressor 1 is controlled by the evaporation temperature of the evaporator 4, and the speed of the auxiliary compressor 13 is controlled by the inlet coolant temperature of the battery 12. In the application, the refrigerant from the main compressor 1 flows through the outdoor heat exchanger 2, the first electronic expansion valve 5, and the evaporator 4. The outdoor heat exchanger 2 transfers heat to the air. The refrigerant from the auxiliary compressor 13 flows through the condenser 14, the third electronic expansion valve 15, and the third heat exchanger 16. The third heat exchanger 16 absorbs heat from the coolant in the battery coolant circuit 300, and the coolant in the battery coolant circuit 300 absorbs heat from the battery 12. At this time, the fan 3 starts to accelerate the heat dissipation of the outdoor heat exchanger 2 and the condenser 14 from the air.

[0038] If the temperature of battery 12 is higher than the first set temperature: The fan, main compressor 1, first electronic expansion valve 5, second electronic expansion valve 7 and fourth electronic expansion valve 8 of the first refrigerant circuit 100 are turned on, and the two-way shut-off valve 9 is turned off. The auxiliary compressor 13 and the third electronic expansion valve of the second refrigerant circuit 200 are opened; The two-way valve 21 of the battery coolant circuit 300 and the battery water pump 10 are opened; The heating water pump 19 of the air conditioning heating circuit 400 is turned off, and the three-way water valve 17 is connected to the first port and the third port; The speed of the main compressor 1 is controlled by the evaporation temperature of the evaporator 4, and the speed of the auxiliary compressor 13 is controlled by the inlet coolant temperature of the battery 12.

[0039] In the application, the refrigerant from the main compressor 1 flows through the outdoor heat exchanger 2, the first and second electronic expansion valves, the evaporator 4, and the first heat exchanger 6. The evaporator 4 absorbs heat from the passenger compartment, and the first heat exchanger 6 absorbs heat from the battery coolant circuit 300. The auxiliary compressor 13 starts, with the inlet water temperature of the battery 12 as the control target. The refrigerant flows through the condenser 14, the third electronic expansion valve 15, and the third heat exchanger 16, cooling the coolant in the battery coolant circuit 300. The battery coolant circuit 300 absorbs heat from the battery 12. At this time, the fan 3 starts to enhance the heat dissipation of the air by the outdoor heat exchanger 2 and the condenser 14.

[0040] In application, the first set temperature is a preset temperature, which is set to 40°C in this embodiment.

[0041] In one embodiment, the operating mode includes a situation where the occupant cabin has no cooling requirement and battery 12 has a cooling requirement, and the control includes: If the temperature of battery 12 is lower than the first set temperature: The main compressor 1 controlling the first refrigerant circuit 100 is turned off, and the fan, the first electronic expansion valve 5, the second electronic expansion valve 7 and the fourth electronic expansion valve 8 are turned on; The auxiliary compressor 13 and the third electronic expansion valve of the second refrigerant circuit 200 are opened; The two-way valve 21 of the battery coolant circuit 300 and the battery water pump 10 are opened; The heating water pump 19 of the air conditioning heating circuit 400 is turned off, and the three-way water valve 17 is connected to the first port and the third port; The rotational speed of the auxiliary compressor 13 is controlled by the inlet coolant temperature of the battery 12; In application, the speed of auxiliary compressor 13 is controlled by the inlet water temperature of battery 12. The refrigerant flows through condenser 14 to dissipate heat into the air. Fan 3 enhances the heat dissipation between the refrigerant and the air in condenser 14. The refrigerant flows through third electronic expansion valve 15 and third heat exchanger 16. Through third heat exchanger 16, the heat of the coolant in battery coolant circuit 300 is transferred to the refrigerant, and the temperature of coolant in battery coolant circuit 300 decreases to cool battery 12. The first refrigerant circuit 100 and battery coolant circuit 300 are controlled to have no heat exchange.

[0042] If the temperature of battery 12 is higher than the first set temperature: The fan, main compressor 1, second electronic expansion valve 7 and fourth electronic expansion valve 8 of the first refrigerant circuit 100 are turned on, and the first electronic expansion valve 5 is turned off; The auxiliary compressor 13 and the third electronic expansion valve of the second refrigerant circuit 200 are opened; The two-way valve 21 of the battery coolant circuit 300 and the battery water pump 10 are opened; The heating water pump 19 of the air conditioning heating circuit 400 is turned off, and the three-way water valve 17 is connected to the first port and the third port; The speed of the main compressor 1 is controlled by the inlet coolant temperature of the battery 12, and the speed of the auxiliary compressor 13 is controlled by the inlet coolant temperature of the battery 12 plus a calibration value.

[0043] In application, the speed of the main compressor 1 is controlled by the water temperature of the battery 12. The refrigerant in the first refrigerant circuit 100 flows through the outdoor heat exchanger 2 to dissipate heat into the air. The fan 3 enhances the heat dissipation between the refrigerant and the air in the outdoor heat exchanger 2. The refrigerant flows through the second electronic expansion valve 7 and the first heat exchanger 6 to cool the battery 12. The speed of the auxiliary compressor 1 is controlled by the battery inlet water temperature + n (n is the calibration value). The refrigerant flows through the condenser 14 to dissipate heat into the air. The fan 3 enhances the heat dissipation between the refrigerant and the air in the condenser 14. The refrigerant flows through the third electronic expansion valve 15 and the third heat exchanger 16. Through the third heat exchanger 16, the heat of the coolant in the battery coolant circuit 300 is transferred to the refrigerant, and the temperature of the coolant in the battery coolant circuit 300 decreases to cool the battery 12.

[0044] In one embodiment, the operating mode includes a heating requirement for the crew cabin and a cooling requirement for the battery 12, and the control includes: The fan, main compressor 1, fourth electronic expansion valve 8, and two-way shut-off valve 9 of the first refrigerant circuit 100 are turned on, while the first electronic expansion valve 5 and the second electronic expansion valve 7 are turned off. The auxiliary compressor 13 and the third electronic expansion valve of the second refrigerant circuit 200 are opened; The two-way valve 21 of the battery coolant circuit 300 and the battery water pump 10 are opened; The heating water pump 19 of the air conditioning heating circuit 400 is turned on, and the three-way water valve 17 is connected to the first port and the third port; The speed of the main compressor 1 is controlled by the water temperature of the heater core 20, and the speed of the auxiliary compressor 13 is controlled by the inlet coolant temperature of the battery 12.

[0045] In the application, the speed of the main compressor 1 in the first refrigerant circuit 100 is controlled with the water temperature of the heater core 20 as the control target. The refrigerant flows through the fourth heat exchanger 18, and the high-temperature and high-pressure steam in the first refrigerant circuit 100 transfers heat to the air conditioning heater circuit 400 through the fourth heat exchanger 18. Heat is extracted from the air through the outdoor heat exchanger 2, and the heater core 20 in the air conditioning heater circuit 400 transfers heat to the passenger compartment. The speed of the auxiliary compressor 13 is controlled with the inlet water temperature of the battery 12 as the control target. The refrigerant flows through the condenser 14, the third electronic expansion valve 15, and the third heat exchanger 16. The third heat exchanger 16 cools the coolant in the battery coolant circuit 300, and the coolant in the battery coolant circuit 300 cools the battery 12. At this time, the fan 3 starts to accelerate the heat dissipation of the outdoor heat exchanger 2, the condenser 14, and the air.

[0046] In one embodiment, the operating mode includes a situation where the occupant cabin has no need for heating and the battery 12 has a heating need, and the control includes: The fan, main compressor 1, fourth electronic expansion valve 8, and two-way shut-off valve 9 of the first refrigerant circuit 100 are turned on, while the first electronic expansion valve 5 and the second electronic expansion valve 7 are turned off. The auxiliary compressor 13 controlling the second refrigerant circuit 200 is shut down, and the third electronic expansion valve is opened; The two-way valve 21 controlling the battery coolant circuit 300 is closed, and the battery water pump 10 is turned on; The heating water pump 19 of the air conditioning heating circuit 400 is turned on, and the three-way water valve 17 is connected to the first port and the second port. The rotational speed of the main compressor 1 is controlled by the inlet coolant temperature of the battery 12.

[0047] In this application, the main compressor 1 speed is controlled by the inlet water temperature of battery 12. The high-temperature, high-pressure steam from the main compressor 1 outlet in the first refrigerant circuit 100 transfers heat to the air conditioning heating circuit 400 via the fourth heat exchanger 18. Heat is extracted from the air by the outdoor heat exchanger and transferred to the first refrigerant circuit 100. The coolant in the air conditioning heating circuit 400 transfers heat to the battery coolant circuit 300 via the second heat exchanger 11, raising the coolant temperature in the battery coolant circuit 300 and heating the battery 12. At this time, fan 3 starts to accelerate heat exchange in the outdoor heat exchanger 2.

[0048] In one embodiment, the operating mode includes a scenario where the crew cabin requires heating but battery 12 does not, and the control includes: The fan, main compressor 1, fourth electronic expansion valve 8, and two-way shut-off valve 9 of the first refrigerant circuit 100 are turned on, while the first electronic expansion valve 5 and the second electronic expansion valve 7 are turned off. The auxiliary compressor 13 controlling the second refrigerant circuit 200 is shut down, and the third electronic expansion valve is opened; The two-way valve 21 of the battery coolant circuit 300 is opened, and the battery water pump 10 is turned off; The heating water pump 19 of the air conditioning heating circuit 400 is turned on, and the three-way water valve 17 is connected to the first port and the third port; The speed of the main compressor 1 is controlled by the water temperature of the heater core 20.

[0049] In the application, the main compressor 1 speed is controlled by the water temperature of the heater core 20. The high-temperature, high-pressure steam in the first refrigerant circuit 100 transfers heat to the air conditioning heating circuit 400 via the fourth heat exchanger 18. Heat is then extracted from the air by the outdoor heat exchanger 2 and transferred to the coolant in the air conditioning heating circuit 400. The heater core 20 in the air conditioning heating circuit 400 then transfers heat to the passenger compartment. At this time, the fan 3 starts to accelerate heat exchange in the outdoor heat exchanger 2.

[0050] In one embodiment, the operating mode includes a heating requirement for both the crew cabin and the battery 12, and the control includes: The fan, main compressor 1, fourth electronic expansion valve 8, and two-way shut-off valve 9 of the first refrigerant circuit 100 are turned on, while the first electronic expansion valve 5 and the second electronic expansion valve 7 are turned off. The auxiliary compressor 13 controlling the second refrigerant circuit 200 is shut down, and the third electronic expansion valve is opened; The two-way valve 21 controlling the battery coolant circuit 300 is closed, and the battery water pump 10 is turned on; The heating water pump 19 of the air conditioning heating circuit 400 is turned on, and the three-way water valve 17 is connected to the first port and the second port. The speed of the main compressor 1 is controlled by the water temperature of the heater core 20.

[0051] In this application, the main compressor 1 speed is controlled by the water temperature of the heater core 20. The high-temperature, high-pressure steam in the first refrigerant circuit 100 transfers heat to the air conditioning heating circuit 400 via the fourth heat exchanger 18. Heat is then extracted from the air by the outdoor heat exchanger 2 and transferred to the coolant in the air conditioning heating circuit 400. The heater core 20 in the air conditioning heating circuit 400 then transfers heat to the passenger compartment. The coolant in the air conditioning heating circuit 400 transfers heat to the battery coolant circuit 300 via the second heat exchanger 11, raising the coolant temperature in the battery coolant circuit 300 and heating the battery 12. At this time, the fan 3 starts to accelerate heat exchange in the outdoor heat exchanger 2.

[0052] A third aspect of this application provides a new energy heavy-duty commercial vehicle, including a dual-compressor thermal management system as provided in the first aspect of this application.

[0053] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A dual-compressor thermal management system for commercial vehicles, characterized in that, include: The first refrigerant circuit (100) includes a main compressor (1), an outdoor heat exchanger (2), a first heat exchanger (6) and a fourth heat exchanger (18) connected by refrigerant pipelines. The second refrigerant circuit (200) includes an auxiliary compressor (13), a condenser (14) and a third heat exchanger (15) connected in sequence through refrigerant pipelines. The battery coolant circuit (300) includes a battery (12) and a second heat exchanger (11) connected via coolant lines. The air conditioning heating circuit (400) includes a heating water pump (19), a heating core (20), and a three-way water valve (17) connected by a coolant pipeline. The first heat exchanger (6) is used for heat exchange between the first refrigerant circuit (100) and the battery coolant circuit (300), the second heat exchanger (11) is used for heat exchange between the battery coolant circuit (300) and the air conditioning heating circuit (400), and the third heat exchanger (15) is used for heat exchange between the second refrigerant circuit (200) and the battery coolant circuit (300).

2. The commercial vehicle dual-compressor thermal management system as described in claim 1, characterized in that, The first refrigerant circuit (100) also includes a first electronic expansion valve (5), an evaporator (4), a second electronic expansion valve (7), a fourth electronic expansion valve (8), and a two-way shut-off valve (9). The outlet end of the main compressor (1) is sequentially connected to the hot side of the fourth heat exchanger (18), the fourth electronic expansion valve (8), the outdoor heat exchanger (2), the first electronic expansion valve (5), and the evaporator (4). The evaporator (4) is connected to the inlet end of the main compressor (1). One end of the cold side of the first heat exchanger (6) is connected to the inlet end of the main compressor (1), and the other end is connected to one end of the second electronic expansion valve (7). The other end of the second electronic expansion valve (7) is connected to the outlet end of the outdoor heat exchanger (2). The bidirectional shut-off valve (9) is connected between the outlet end of the outdoor heat exchanger (2) and the inlet end of the main compressor (1). The cold side of the fourth heat exchanger (18) is connected to the air conditioning heating circuit (400), and the hot side of the first heat exchanger (6) is connected to the battery coolant circuit (300).

3. The commercial vehicle dual-compressor thermal management system as described in claim 1, characterized in that, The battery coolant circuit (300) also includes a battery water pump (10) and a two-way valve (21). One end of the cold side of the second heat exchanger (11) is connected to the outlet end of the battery water pump (10), and the other end is connected to the coolant inlet end of the battery (12). The coolant outlet end of the battery (12) is connected to the inlet end of the battery water pump (10) in sequence through the two-way valve (21) and the hot side of the third heat exchanger (15). The coolant outlet end of the battery (12) is connected to the inlet end of the battery water pump (10) through the hot side of the first heat exchanger (6). The hot side of the second heat exchanger (11) is connected to the air conditioning heating circuit (400).

4. The commercial vehicle dual-compressor thermal management system as described in claim 1, characterized in that, The three-way water valve (17) of the air conditioning heating circuit (400) is used to connect the first port and the second port, or the first port and the third port; When the first port of the three-way water valve (17) is connected to the second port, the air conditioning heating circuit (400) exchanges heat with the first refrigerant circuit (100) and the battery coolant circuit (300); When the first port of the three-way water valve (17) is connected to the third port, the air conditioning heating circuit (400) exchanges heat with the first refrigerant circuit (100).

5. A control method for a dual-compressor thermal management system for commercial vehicles as described in any one of claims 1 to 4, characterized in that, include: The operating mode of the system is determined based on at least one of the following: the refrigeration requirement of the crew cabin, the heating requirement of the crew cabin, the refrigeration requirement of the battery (12), and the heating requirement of the battery (12). Based on the aforementioned operating mode, the operating status of at least one of the first refrigerant circuit (100), the second refrigerant circuit (200), the battery coolant circuit (300), and the air conditioning heating circuit (400) is controlled.

6. The control method as described in claim 5, characterized in that, The operating mode includes a occupant cabin requiring cooling, but the battery (12) does not require cooling. The control includes: The fan, main compressor (1), first electronic expansion valve (5), and fourth electronic expansion valve (8) controlling the first refrigerant circuit (100) are turned on, and the second electronic expansion valve (7) and two-way shut-off valve (9) are turned off; The third electronic expansion valve controlling the second refrigerant circuit (200) opens, and the auxiliary compressor (13) closes; The two-way valve (21) controlling the battery coolant circuit (300) and the battery water pump (10) are closed; The heating water pump (19) controlling the air conditioning heating circuit (400) is turned off, and the three-way water valve (17) is connected to the first port and the third port; The rotational speed of the main compressor (1) is controlled by the evaporation temperature of the evaporator (4).

7. The control method as described in claim 5, characterized in that, The operating mode includes situations where the crew cabin requires cooling and the battery (12) requires cooling. The control includes: If the battery (12) temperature is lower than the first set temperature: The fan, main compressor (1), first electronic expansion valve (5), and fourth electronic expansion valve (8) controlling the first refrigerant circuit (100) are turned on, and the second electronic expansion valve (7) and two-way shut-off valve (9) are turned off; The auxiliary compressor (13) and the third electronic expansion valve of the second refrigerant circuit (200) are opened; The two-way valve (21) controlling the battery coolant circuit (300) and the battery water pump (10) are opened; The heating water pump (19) controlling the air conditioning heating circuit (400) is turned off, and the three-way water valve (17) is connected to the first port and the third port; The rotational speed of the main compressor (1) is controlled by the evaporation temperature of the evaporator (4), and the rotational speed of the auxiliary compressor (13) is controlled by the inlet coolant temperature of the battery (12). If the battery (12) temperature is higher than the first set temperature: The fan, main compressor (1), first electronic expansion valve (5), second electronic expansion valve (7) and fourth electronic expansion valve (8) controlling the first refrigerant circuit (100) are turned on, and the two-way shut-off valve (9) is turned off; The auxiliary compressor (13) and the third electronic expansion valve of the second refrigerant circuit (200) are opened; The two-way valve (21) controlling the battery coolant circuit (300) and the battery water pump (10) are opened; The heating water pump (19) controlling the air conditioning heating circuit (400) is turned off, and the three-way water valve (17) is connected to the first port and the third port; The rotational speed of the main compressor (1) is controlled by the evaporation temperature of the evaporator (4), and the rotational speed of the auxiliary compressor (13) is controlled by the inlet coolant temperature of the battery (12).

8. The control method as described in claim 5, characterized in that, The operating mode includes a situation where the occupant cabin has no cooling requirement and the battery (12) has a cooling requirement, and the control includes: If the battery (12) temperature is lower than the first set temperature: The main compressor (1) controlling the first refrigerant circuit (100) is turned off, and the fan, the first electronic expansion valve (5), the second electronic expansion valve (7) and the fourth electronic expansion valve (8) are turned on; The auxiliary compressor (13) and the third electronic expansion valve of the second refrigerant circuit (200) are opened; The two-way valve (21) controlling the battery coolant circuit (300) and the battery water pump (10) are opened; The heating water pump (19) controlling the air conditioning heating circuit (400) is turned off, and the three-way water valve (17) is connected to the first port and the third port; The rotational speed of the auxiliary compressor (13) is controlled by the temperature of the coolant at the inlet of the battery (12); If the battery (12) temperature is higher than the first set temperature: The fan, main compressor (1), second electronic expansion valve (7) and fourth electronic expansion valve (8) controlling the first refrigerant circuit (100) are turned on, and the first electronic expansion valve (5) is turned off; The auxiliary compressor (13) and the third electronic expansion valve of the second refrigerant circuit (200) are opened; The two-way valve (21) controlling the battery coolant circuit (300) and the battery water pump (10) are opened; The heating water pump (19) controlling the air conditioning heating circuit (400) is turned off, and the three-way water valve (17) is connected to the first port and the third port; The rotational speed of the main compressor (1) is controlled by the temperature of the coolant at the inlet of the battery (12), and the rotational speed of the auxiliary compressor (13) is controlled by the temperature of the coolant at the inlet of the battery (12) plus a calibration value.

9. The control method as described in claim 5, characterized in that, The operating mode includes situations where the crew cabin requires heating and the battery (12) requires cooling, and the control includes: The fan, main compressor (1), fourth electronic expansion valve (8), and two-way shut-off valve (9) controlling the first refrigerant circuit (100) are turned on, and the first electronic expansion valve (5) and the second electronic expansion valve (7) are turned off; The auxiliary compressor (13) and the third electronic expansion valve of the second refrigerant circuit (200) are opened; The two-way valve (21) controlling the battery coolant circuit (300) and the battery water pump (10) are opened; The heating water pump (19) controlling the air conditioning heating circuit (400) is turned on, and the three-way water valve (17) is connected to the first port and the third port; The rotational speed of the main compressor (1) is controlled by the water temperature of the heater core (20), and the rotational speed of the auxiliary compressor (13) is controlled by the inlet coolant temperature of the battery (12).

10. The control method as described in claim 5, characterized in that, The operating mode includes a situation where the crew cabin has no heating requirement and the battery (12) has a heating requirement. The control includes: The fan, main compressor (1), fourth electronic expansion valve (8), and two-way shut-off valve (9) controlling the first refrigerant circuit (100) are turned on, and the first electronic expansion valve (5) and the second electronic expansion valve (7) are turned off; The auxiliary compressor (13) controlling the second refrigerant circuit (200) is shut down, and the third electronic expansion valve is opened; The two-way valve (21) controlling the battery coolant circuit (300) is closed, and the battery water pump (10) is turned on; The heating water pump (19) controlling the air conditioning heating circuit (400) is turned on, and the three-way water valve (17) is connected to the first port and the second port; The rotational speed of the main compressor (1) is controlled by the temperature of the coolant at the inlet of the battery (12).

11. The control method as described in claim 5, characterized in that, The operating mode includes situations where the crew cabin requires heating but the battery (12) does not, and the control includes: The fan, main compressor (1), fourth electronic expansion valve (8), and two-way shut-off valve (9) controlling the first refrigerant circuit (100) are turned on, and the first electronic expansion valve (5) and the second electronic expansion valve (7) are turned off; The auxiliary compressor (13) controlling the second refrigerant circuit (200) is shut down, and the third electronic expansion valve is opened; The two-way valve (21) controlling the battery coolant circuit (300) is opened, and the battery water pump (10) is closed; The heating water pump (19) controlling the air conditioning heating circuit (400) is turned on, and the three-way water valve (17) is connected to the first port and the third port; The rotational speed of the main compressor (1) is controlled by the water temperature of the warm air core (20).

12. The control method as described in claim 5, characterized in that, The operating mode includes situations where the crew cabin requires heating and the battery (12) requires heating. The control includes: The fan, main compressor (1), fourth electronic expansion valve (8), and two-way shut-off valve (9) controlling the first refrigerant circuit (100) are turned on, and the first electronic expansion valve (5) and the second electronic expansion valve (7) are turned off; The auxiliary compressor (13) controlling the second refrigerant circuit (200) is shut down, and the third electronic expansion valve is opened; The two-way valve (21) controlling the battery coolant circuit (300) is closed, and the battery water pump (10) is turned on; The heating water pump (19) controlling the air conditioning heating circuit (400) is turned on, and the three-way water valve (17) is connected to the first port and the second port; The rotational speed of the main compressor (1) is controlled by the water temperature of the warm air core (20).

Images