Water loop control system and control method for non-integrated heat pump system of vehicle

Abstract

The invention provides a water loop control system and method for a non-integrated heat pump system of a vehicle, and the system comprises a first communication assembly which is connected between a motor water loop and a battery water loop, so as to control the communication or non-communication between the motor water loop and the battery water loop; the second communication assembly is connected between the battery water loop and the crew cabin water loop so as to control the battery water loop and the crew cabin water loop to be communicated or not communicated; the controller is used for controlling the first communication assembly according to the temperature of the cooling liquid in the motor water loop and the temperature of the cooling liquid in the battery water loop; the controller is further used for controlling the second communication assembly according to the temperature of the cooling liquid in the battery water loop and the temperature of the crew cabin water loop. The vehicle energy efficiency can be improved, the comfort of passengers is optimized, and the service life of the power battery is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a water circuit control system and control method of a non-integrated heat pump system of a vehicle. BACKGROUND

[0002] In the heat pump system architecture of a vehicle, the non-integrated heat pump system is widely used due to its modular design and high flexibility. The non-integrated heat pump system configures independent water circuits for the motor, battery, and cabin heat management objects, and exchanges heat through valves and heat exchangers. There is a situation of low heat source utilization efficiency and unreasonable heat distribution. For example, the motor or battery has waste heat under different working conditions, but since the water circuits of the motor, battery, and cabin are independent, the existing system cannot utilize the waste heat of the motor or battery to heat the cabin or other modules, resulting in low energy efficiency and heat waste. Therefore, there is room for improvement. SUMMARY

[0003] The present application provides a water circuit control system and control method of a non-integrated heat pump system of a vehicle to solve the technical problem that the water circuits of the motor, battery, and cabin are independent in the prior art and cannot utilize the waste heat of the motor or battery.

[0004] The water circuit control system of a non-integrated heat pump system of a vehicle provided by the present application comprises a motor water circuit, a battery water circuit, and a cabin water circuit. The water circuit control system further comprises:

[0005] A first communication component connected between the motor water circuit and the battery water circuit to control the communication or non-communication between the motor water circuit and the battery water circuit;

[0006] A second communication component connected between the battery water circuit and the cabin water circuit to control the communication or non-communication between the battery water circuit and the cabin water circuit;

[0007] A controller for controlling the first communication component according to the temperature of the coolant in the motor water circuit and the temperature of the coolant in the battery water circuit; the controller is also used to control the second communication component according to the temperature of the coolant in the battery water circuit and the temperature of the cabin water circuit.

[0008] In an embodiment of the present application, the first communication component is a four-way valve, and when the first interface and the second interface of the four-way valve are communicated on the motor water circuit and the third interface and the fourth interface are communicated on the battery water circuit, the communication between the motor water circuit and the battery water circuit is controlled to be non-communication;

[0009] The first interface and the fourth interface of the four-way valve are communicated between the motor water circuit and the battery water circuit, and when the second interface and the third interface are communicated between the motor water circuit and the battery water circuit, the motor water circuit and the battery water circuit are controlled to be communicated.

[0010] In an embodiment of the present application, the second communication component is a four-way valve, and when the first interface and the second interface of the four-way valve are communicated on the battery water circuit, and the third interface and the fourth interface are communicated on the cabin water circuit, the battery water circuit and the cabin water circuit are controlled to be not communicated.

[0011] The first interface and the fourth interface of the four-way valve are communicated between the battery water circuit and the cabin water circuit, and when the second interface and the third interface are communicated between the battery water circuit and the cabin water circuit, the battery water circuit and the cabin water circuit are controlled to be communicated.

[0012] In an embodiment of the present application, the second communication component is a three-way valve, and when the first interface and the second interface of the first three-way valve are communicated between the battery water circuit and the cabin water circuit, and the first interface and the second interface of the second three-way valve are communicated between the battery water circuit and the cabin water circuit, the battery water circuit and the cabin water circuit are controlled to be communicated.

[0013] In an embodiment of the present application, the controller is further configured to control the first interface and the second interface of the first communication component to be communicated, and the third interface and the fourth interface to be communicated, when a temperature difference between the temperature of the cooling liquid in the motor water circuit and the temperature of the cooling liquid in the battery water circuit is less than a preset first temperature threshold value.

[0014] And control the first interface and the second interface of the second communication component to be communicated, and the third interface and the fourth interface to be communicated, when a temperature difference between the temperature of the cooling liquid in the battery water circuit and the temperature of the cooling liquid in the cabin water circuit is less than a preset second temperature threshold value.

[0015] In an embodiment of the present application, the controller is further configured to control the first interface and the second interface of the first communication component to be communicated, and the third interface and the fourth interface to be communicated, when a temperature difference between the temperature of the cooling liquid in the motor water circuit and the temperature of the cooling liquid in the battery water circuit is less than a preset first temperature threshold value.

[0016] And control the first interface and the fourth interface of the second communication component to be communicated, and the second interface and the third interface to be communicated, when a temperature difference between the temperature of the cooling liquid in the battery water circuit and the temperature of the cooling liquid in the cabin water circuit is greater than or equal to a preset second temperature threshold value.

[0017] In an embodiment of the present application, the controller is further configured to control the first interface and the fourth interface of the first communication assembly to be in communication, and the second interface and the third interface to be in communication when a temperature difference between the temperature of the cooling liquid in the motor water circuit and the temperature of the cooling liquid in the battery water circuit is greater than or equal to a preset first temperature threshold value; and control the first interface and the second interface of the second communication assembly to be in communication, and the third interface and the fourth interface to be in communication when a temperature difference between the temperature of the cooling liquid in the battery water circuit and the temperature of the cooling liquid in the cabin water circuit is less than a preset second temperature threshold value.

[0018] In an embodiment of the present application, the controller is further configured to control the first interface and the fourth interface of the first communication assembly to be in communication, and the second interface and the third interface to be in communication when a temperature difference between the temperature of the cooling liquid in the motor water circuit and the temperature of the cooling liquid in the battery water circuit is greater than or equal to a preset first temperature threshold value; and control the first interface and the second interface of the second communication assembly to be in communication, and the third interface and the fourth interface to be in communication when a temperature difference between the temperature of the cooling liquid in the battery water circuit and the temperature of the cooling liquid in the cabin water circuit is less than a preset second temperature threshold value.

[0019] In an embodiment of the present application, the controller is further configured to control the first interface and the fourth interface of the first communication assembly to be in communication, and the second interface and the third interface to be in communication when a temperature difference between the temperature of the cooling liquid in the motor water circuit and the temperature of the cooling liquid in the battery water circuit is greater than or equal to a preset first temperature threshold value; and control the first interface and the second interface of the second communication assembly to be in communication, and the third interface and the fourth interface to be in communication when a temperature difference between the temperature of the cooling liquid in the battery water circuit and the temperature of the cooling liquid in the cabin water circuit is less than a preset second temperature threshold value.

[0020] In an embodiment of the present application, the controller is further configured to control the first interface and the fourth interface of the first communication assembly to be in communication, and the second interface and the third interface to be in communication when a temperature difference between the temperature of the cooling liquid in the motor water circuit and the temperature of the cooling liquid in the battery water circuit is greater than or equal to a preset first temperature threshold value; and control the first interface and the second interface of the second communication assembly to be in communication, and the third interface and the fourth interface to be in communication when a temperature difference between the temperature of the cooling liquid in the battery water circuit and the temperature of the cooling liquid in the cabin water circuit is less than a preset second temperature threshold value.

[0021] In an embodiment of the present application, the controller is further configured to control the first interface and the fourth interface of the first communication assembly to be in communication, and the second interface and the third interface to be in communication when a temperature difference between the temperature of the cooling liquid in the motor water circuit and the temperature of the cooling liquid in the battery water circuit is greater than or equal to a preset first temperature threshold value; and control the first interface and the second interface of the second communication assembly to be in communication, and the third interface and the fourth interface to be in communication when a temperature difference between the temperature of the cooling liquid in the battery water circuit and the temperature of the cooling liquid in the cabin water circuit is less than a preset second temperature threshold value.

[0022] In an embodiment of the present application, the controller is further configured to control the first interface and the fourth interface of the first communication assembly to be in communication, and the second interface and the third interface to be in communication when a temperature difference between the temperature of the cooling liquid in the motor water circuit and the temperature of the cooling liquid in the battery water circuit is greater than or equal to a preset first temperature threshold value; and control the first interface and the second interface of the second communication assembly to be in communication, and the third interface and the fourth interface to be in communication when a temperature difference between the temperature of the cooling liquid in the battery water circuit and the temperature of the cooling liquid in the cabin water circuit is less than a preset second temperature threshold value.

[0023] The present application further provides a water circuit control method of a non-integrated heat pump system of a vehicle, which applies the water circuit control system of the non-integrated heat pump system of the vehicle as described above, and is characterized in that the water circuit control method of the non-integrated heat pump system of the vehicle comprises:

[0024] controlling the first communication assembly according to the temperature of the cooling liquid in the motor water circuit and the temperature of the cooling liquid in the battery water circuit, so as to make the motor water circuit and the battery water circuit in communication or not in communication;

[0025] According to the temperature of the cooling liquid in the battery water circuit, the temperature of the cabin water circuit, the second communication assembly is controlled to make the battery water circuit and the cabin water circuit communicate or not communicate.

[0026] The water circuit control system and control method of the vehicle non-integrated heat pump system provided by the application can realize whether the motor water circuit and the battery water circuit communicate or not communicate through the first communication assembly connected between the motor water circuit and the battery water circuit, and whether the battery water circuit and the cabin water circuit communicate or not communicate through the second communication assembly connected between the battery water circuit and the cabin water circuit. Moreover, the controller controls the first communication assembly and the second communication assembly respectively according to the temperature of the cooling liquid in the motor water circuit, the temperature of the cooling liquid in the battery water circuit and the temperature of the cooling liquid in the cabin water circuit, so as to realize the switching between different water circuit modes. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application. It is to be understood that the drawings are designed solely for purposes of illustration to be used in conjunction with the description. It is to be understood that the drawings are to be used for the purposes of explanation of principles of the application and are not to be used to limit the application.

[0028] In the drawings:

[0029] Figure 1 The structural block diagram of the water circuit control system of the vehicle non-integrated heat pump system provided by an embodiment of the application is shown.

[0030] Figure 2 The structural block diagram of the water circuit control system of the vehicle non-integrated heat pump system provided by another embodiment of the application is shown.

[0031] Figure 3 The step schematic diagram of the water circuit control method of the vehicle non-integrated heat pump system provided by an embodiment of the application is shown. DETAILED DESCRIPTION

[0032] The embodiments of the application in connection with the specific examples described herein are intended to be illustrative only and not restrictive. Other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the foregoing description. The application can be implemented or carried out in other ways than those specifically described herein without departing from the spirit and essential characteristics of the application. The embodiments described herein and in the examples can be combined with each other in all possible ways unless otherwise explicitly stated.

[0033] It is to be understood that the figures provided in the following embodiments are only schematic and that the drawings only show components related to the application, and not all the components of an apparatus, as well as the number, shape, and sizes of the components may vary from those depicted in the drawings depending on the desired implementation.

[0034] In the following description, numerous specific details are discussed in order to provide a thorough understanding of the embodiments of the application. However, it will be apparent to one of ordinary skill in the art that the embodiments of the application can be practiced without these specific details. In other instances, well-known structures and devices are not described in exhaustive detail, in order to avoid obscuring the embodiments of the application.

[0035] Referring to Figures 1 to 3 The application provides a water circuit control system and a control method of a non-integrated heat pump system of a vehicle, which can be applied to the field of new energy vehicles, for example, improving the vehicle thermal management system in terms of energy efficiency, optimizing passenger comfort, and prolonging the service life of the power battery. The following will be described in detail through specific embodiments.

[0036] Referring to Figure 1 and Figure 2 In one embodiment of the application, a water circuit control system of a non-integrated heat pump system of a vehicle is provided, which can include a motor water circuit, a battery water circuit, and a cabin water circuit. The motor water circuit includes a motor 30 and a motor water pump 310. The battery water circuit includes a battery module 40 and a battery water pump 410. The cabin water circuit includes a heater water pump 510 and a heat exchanger 50. The water circuit control system can further include a first communication component 10, a second communication component 20, and a controller.

[0037] Specifically, the first communication component 10 is connected between the motor water circuit and the battery water circuit, for controlling whether the two circuits are communicated. The second communication component 20 is connected between the battery water circuit and the cabin water circuit, for controlling whether the two circuits are communicated. The controller is responsible for controlling the first communication component 10 according to the temperature of the cooling liquid in the motor water circuit and the temperature of the cooling liquid in the battery water circuit. The controller is also responsible for controlling the second communication component 20 according to the temperature of the cooling liquid in the battery water circuit and the temperature of the cooling liquid in the cabin water circuit. The temperature of the cooling liquid in the motor water circuit, the temperature of the cooling liquid in the battery water circuit, and the temperature of the cooling liquid in the cabin water circuit can be collected in real time by a temperature sensor 60.

[0038] Specifically, the water circuit mode of the vehicle includes the following modes.

[0039] First water circuit mode: The motor water circuit and the battery water circuit are not connected, and the battery water circuit and the crew cabin water circuit are not connected.

[0040] Second water circuit mode: The motor water circuit and the battery water circuit are not connected, while the battery water circuit and the crew cabin water circuit are connected.

[0041] The third water circuit mode: the motor water circuit and the battery water circuit are connected, while the battery water circuit and the crew cabin water circuit are not connected.

[0042] Fourth water circuit mode: The motor water circuit and the battery water circuit are connected, and the battery water circuit and the crew cabin water circuit are connected.

[0043] The controller employs an intelligent strategy to determine and switch between different water circuit modes to achieve efficient thermal management. This strategy is based on monitoring the vehicle's current operating status, including parameters such as ambient temperature, passenger compartment heating requests, the battery's own thermal management status (e.g., whether there are active heating or cooling requests), battery cell temperature, coolant temperature at the motor outlet, coolant temperature at the battery inlet, and vehicle speed.

[0044] When the cabin requests heating, the controller prioritizes determining if the conditions for the highest priority "simultaneous heating of the cabin by the motor and battery" mode are met. This mode corresponds to the fourth water circuit mode, where the motor water circuit, battery water circuit, and cabin water circuit are connected in series. To enter the fourth water circuit mode, a series of conditions must be met simultaneously, such as: ambient temperature within a certain range; no active heating or cooling demand from the battery; the calculated target heat exchanger temperature below a specific calibration value; the minimum temperature of the battery cells and the target heat exchanger temperature remaining within a reasonable range; the battery inlet water temperature below a certain limit; and the motor outlet water temperature significantly higher than the battery outlet water temperature, with the difference determined by a calibration value based on the ambient temperature. If all these conditions are met, the controller will control the first connecting component 10 and the second connecting component 20, forming a series path for the three water circuits, allowing the motor 30 and battery module 40 to jointly act as heat sources to heat the cabin. When any condition is no longer met, such as when the target heat exchanger temperature rises above the exit calibration value, the controller will exit the mode.

[0045] If the conditions for the "motor and battery simultaneously heating the cabin" mode are not met simultaneously, the controller will then determine whether the conditions for the secondary priority "battery heating the cabin" mode are met, corresponding to the second water circuit mode. In this mode, the motor water circuit operates independently, while the battery water circuit is connected in series with the cabin water circuit. The conditions for entering the second water circuit mode include a heating request from the cabin, an ambient temperature within the set range, no active thermal management requirements from the battery, and the target heat exchanger temperature being lower than its calibrated value. Crucially, the minimum temperature of the battery module 40 must be higher than the target heat exchanger temperature by a specific calibrated value, indicating that the battery module 40 has sufficient heat to heat the cabin independently. When these conditions are met, the controller will control the first connecting component 10 to make the motor water circuit independent, while simultaneously controlling the second connecting component 20 to connect the battery water circuit in series with the cabin water circuit. If the temperature of the battery module 40 drops to an insufficient level for heating, this mode will exit.

[0046] If neither of the above two modes for heating the cabin is applicable, but the cabin still requires heating, the controller will determine whether the conditions for the "motor-to-battery heat storage" mode are met. This mode corresponds to water circuit mode three, where the cabin water circuit operates independently, while the motor water circuit and battery water circuit are connected in series. The purpose of the third water circuit mode is to utilize the waste heat of the motor 30 to heat the battery module 40 and store heat for later use. The conditions for entering this mode are relatively strict, including a cabin heating request, no active thermal management requirement for the battery, a low target heat exchanger temperature, a low battery module 40 temperature (with limits on both minimum and maximum temperatures), a battery inlet water temperature that is not too high, a motor outlet water temperature that is significantly higher than the battery temperature, and a vehicle speed that is above a certain value and maintained for a period of time to ensure stable heat output from the motor 30. When the conditions are met, the controller controls the first connecting component 10 to connect the motor water circuit and battery water circuit in series, while simultaneously controlling the second connecting component 20 to make the cabin water circuit independent. When the battery module 40 temperature rises to a certain level or the vehicle speed is too low, resulting in insufficient heat, this mode is exited.

[0047] If none of the conditions for the above three specific functional modes are met, the system will enter the default operating condition, namely the first water circuit mode. In this mode, the controller controls the first connecting component 10 and the second connecting component 20, so that the motor water circuit, battery water circuit and crew cabin water circuit operate independently and are not connected to each other. This is the most basic thermal management mode, ensuring that each component can perform thermal management independently when complex heat interaction is not required.

[0048] Please see Figure 1 In one embodiment of the present invention, the first connecting component 10 is a four-way valve. When the first and second ports of the four-way valve are connected to the motor water circuit and the third and fourth ports are connected to the battery water circuit, the motor water circuit and the battery water circuit are not connected.

[0049] When the first and fourth ports of the four-way valve are connected between the motor water circuit and the battery water circuit, and the second and third ports are connected between the motor water circuit and the battery water circuit, the connection between the motor water circuit and the battery water circuit is controlled.

[0050] Specifically, the first connecting component 10 is implemented using a four-way valve. This four-way valve has four ports, labeled as port 1, port 2, port 3, and port 4. The four-way valve controls the connection between the motor water circuit and the battery water circuit by changing the connection relationship of its internal flow channels.

[0051] For example, when it is necessary to keep the motor coolant circuit and the battery coolant circuit independent and unconnected, the controller controls the four-way valve. The first and second ports of the four-way valve are connected by an internal channel, and these two ports are connected to the pipeline of the motor coolant circuit, allowing the motor coolant to flow between the first and second ports, but the flow path is limited to the inside of the motor coolant circuit. Simultaneously, the third and fourth ports of the four-way valve are connected by an internal channel, and these two ports are connected to the pipeline of the battery coolant circuit, allowing the battery coolant to flow between the third and fourth ports, but the flow path is limited to the inside of the battery coolant circuit. Because the flow path connecting the first and second ports is isolated from the flow path connecting the third and fourth ports inside the valve, the coolant between the motor coolant circuit and the battery coolant circuit cannot be exchanged, thus achieving the effect of disconnecting the two circuits.

[0052] For example, when it is necessary to connect the motor water circuit and the battery water circuit, the controller controls the four-way valve. The first port is no longer connected to the second port, but to the fourth port; simultaneously, the second port is connected to the third port. From a piping perspective, the first and fourth ports are connected to the connecting pipes of the motor water circuit and the battery water circuit, respectively, while the second and third ports are connected to the connecting pipes on the other side of the battery water circuit and the motor water circuit, respectively. In this way, coolant can flow from the motor water circuit through the first port into the four-way valve, and then out through the fourth port into the battery water circuit. Simultaneously, coolant can also flow from the battery water circuit through the third port into the four-way valve, and then out through the second port back into the motor water circuit. This forms a complete series circulation path, merging the motor water circuit and the battery water circuit into a large circulation system, achieving connectivity between the two circuits.

[0053] This four-way valve design provides a compact and reliable control solution. By switching between two states on a single valve body, the connection and disconnection modes between the motor water circuit and the battery water circuit can be achieved, simplifying piping layout and improving system controllability. The controller's task is to send commands to this four-way valve according to the needs of the thermal management strategy, causing it to switch to the corresponding state.

[0054] Similarly, such as Figure 1 As shown, in one embodiment of the present invention, the second communication component 20 can also be implemented using a four-way valve. This four-way valve has four ports, labeled as the first port, the second port, the third port, and the fourth port. The four-way valve controls the communication state between the battery water circuit and the crew cabin water circuit by changing the connection relationship of its internal flow channels.

[0055] Specifically, the second connecting component 20 is a four-way valve. When the first and second ports of the four-way valve are connected to the battery water circuit and the third and fourth ports are connected to the crew cabin water circuit, the battery water circuit and the crew cabin water circuit are not connected.

[0056] When the first and fourth ports of the four-way valve are connected between the battery water circuit and the crew cabin water circuit, and the second and third ports are connected between the battery water circuit and the crew cabin water circuit, the connection between the battery water circuit and the crew cabin water circuit is controlled.

[0057] Please see Figure 2 In one embodiment of the present invention, the second connecting component 20 may also employ three three-way valves 210 to achieve the connection between the battery water circuit and the crew cabin water circuit.

[0058] Specifically, the second connecting component 20 is a three-way valve. The first and second ports of the first three-way valve are connected between the battery water circuit and the crew cabin water circuit. When the first and second ports of the second three-way valve are connected between the battery water circuit and the crew cabin water circuit, the connection between the battery water circuit and the crew cabin water circuit is controlled.

[0059] The following is combined with Figure 1 , Figure 2 The paper analyzes in detail how the controller controls the first connecting component 10 and the second connecting component 20 to realize the first waterway mode, the second waterway mode, the third waterway mode and the fourth waterway mode.

[0060] Please see Figure 1In one embodiment of the present invention, when the first connecting component 10 is a four-way valve and the second connecting component 20 is also a four-way valve, the controller is further configured to control the first interface and the second interface of the first connecting component to connect, and the third interface and the fourth interface to connect, when the temperature difference between the temperature of the coolant in the motor water circuit and the temperature of the coolant in the battery water circuit is less than a preset first temperature threshold.

[0061] And when the temperature difference between the coolant temperature in the battery water circuit and the coolant temperature in the cabin water circuit is less than a preset second temperature threshold, the first and second interfaces of the second communication component are connected, and the third and fourth interfaces are connected.

[0062] Specifically, such as Figure 1 As shown, the controller continuously monitors the temperature of the coolant in the motor water circuit and the temperature of the coolant in the battery water circuit, and calculates the difference between these two temperatures. When the controller determines that the temperature difference between the motor water circuit and the battery water circuit is less than a preset first temperature threshold, it indicates that the temperature levels of the two thermally managed objects, the motor and the battery, are relatively close, and there is no urgent need for thermal interaction, or the interaction is not very meaningful. At this time, the controller sends a control command to the first connecting component 10, i.e., the four-way valve connecting the motor water circuit and the battery water circuit, so that the first and second ports of the four-way valve are connected inside the valve, and the third and fourth ports are connected inside the valve. Since the first and second ports are connected to the pipeline of the motor water circuit, and the third and fourth ports are connected to the pipeline of the battery water circuit, the motor water circuit and the battery water circuit maintain their own internal circulation, but the two circuits are isolated from each other, and there is no flow of coolant. Therefore, the thermal management of the motor and the battery is performed independently at this time.

[0063] At the same time, such as Figure 1As shown, the controller continuously monitors the coolant temperature in both the battery coolant circuit and the passenger compartment coolant circuit, calculating the difference between these two temperatures. When the controller determines that the temperature difference between the battery coolant circuit and the passenger compartment coolant circuit is less than a preset second temperature threshold, it indicates that the battery temperature is not significantly different from the target temperature required for passenger compartment heating, and using battery heat to heat the passenger compartment may be insignificant or unnecessary. At this time, the controller sends a control command to the second connecting component, namely the four-way valve connecting the battery coolant circuit and the passenger compartment coolant circuit, causing the first and second ports of this four-way valve to connect internally, and the third and fourth ports to connect internally. Since the first and second ports are connected to the battery coolant circuit piping, while the third and fourth ports are connected to the passenger compartment coolant circuit piping, this valve core state allows the battery coolant circuit and the passenger compartment coolant circuit to maintain internal circulation, but the two circuits are isolated from each other. Therefore, the thermal management of the battery and the passenger compartment is also performed independently at this time.

[0064] In summary, when the temperature difference between the coolant in the motor water circuit and the battery water circuit is small, and the temperature difference between the coolant in the battery water circuit and the passenger compartment water circuit is also small, the controller sets the system to a mode where the motor water circuit, battery water circuit, and passenger compartment water circuit operate completely independently, i.e., the first water circuit mode, by controlling two four-way valves. This mode is suitable for normal operating conditions where the heat load of each component is relatively balanced and complex heat transfer is not required, which helps to simplify control and ensure the independent and stable operation of each circuit. The first temperature threshold and the second temperature threshold are pre-calibrated values ​​based on the thermal management requirements and system characteristics of the specific vehicle model. The first temperature threshold can be 5℃~7℃, and the second temperature threshold can be 5℃~7℃.

[0065] Similarly, such as Figure 1 As shown, the controller is also used to control the first interface and the second interface of the first connecting component to connect, and the third interface and the fourth interface to connect, when the temperature difference between the temperature of the coolant in the motor water circuit and the temperature of the coolant in the battery water circuit is less than a preset first temperature threshold.

[0066] And when the temperature difference between the coolant temperature in the battery water circuit and the coolant temperature in the crew cabin water circuit is greater than or equal to a preset second temperature threshold, the first and fourth interfaces of the second communication component are connected, and the second and third interfaces are connected.

[0067] Correspondingly, the motor water circuit operates independently, while the battery water circuit and the crew compartment water circuit operate in series, which is the second water circuit mode.

[0068] Similarly, such as Figure 1As shown, the controller is also used to control the first and fourth interfaces of the first connecting component to connect, and the second and third interfaces to connect, when the temperature difference between the coolant temperature in the motor water circuit and the coolant temperature in the battery water circuit is greater than or equal to a preset first temperature threshold.

[0069] And when the temperature difference between the coolant temperature in the battery water circuit and the coolant temperature in the cabin water circuit is less than a preset second temperature threshold, the first and second interfaces of the second communication component are connected, and the third and fourth interfaces are connected.

[0070] Correspondingly, the motor water circuit and battery water circuit operate in series, while the crew cabin water circuit operates independently, which is the third water circuit mode.

[0071] Similarly, such as Figure 1 As shown, the controller is also used to control the first interface and the fourth interface of the first communication component 10 to connect, and the second interface and the third interface to connect, when the temperature difference between the temperature of the coolant in the motor water circuit and the temperature of the coolant in the battery water circuit is greater than or equal to a preset first temperature threshold.

[0072] And when the temperature difference between the coolant temperature in the battery water circuit and the coolant temperature in the cabin water circuit is greater than or equal to a preset second temperature threshold, the first and fourth interfaces of the second communication component 20 are connected, and the second and third interfaces are connected.

[0073] Correspondingly, the water circuits for the motor, battery, and crew compartment operate in series, which is the fourth water circuit mode.

[0074] Please see Figure 2 In one embodiment of the present invention, when the first connecting component 10 is a four-way valve and the second connecting component 20 is a three-way valve, the controller is further configured to control the first and second interfaces of the first connecting component to connect, and the third and fourth interfaces to connect, when the temperature difference between the coolant temperature in the motor water circuit and the coolant temperature in the battery water circuit is less than a preset first temperature threshold. Otherwise, the controller controls the first and fourth interfaces of the first connecting component to connect, and the second and third interfaces to connect.

[0075] And when the temperature difference between the coolant temperature in the battery water circuit and the coolant temperature in the crew cabin water circuit is greater than or equal to a preset second temperature threshold, the first and second interfaces of the first three-way valve are connected, and the first and second interfaces of the second three-way valve are connected.

[0076] Correspondingly, the water circuits for the motor, battery, and crew compartment operate in series, which is the fourth water circuit mode.

[0077] When the first and second interfaces of the first connecting component are connected, and the third and fourth interfaces are connected, and the first and second interfaces of the first three-way valve are connected, and the first and second interfaces of the second three-way valve are connected, the corresponding mode is the second water circuit mode.

[0078] When the first and fourth interfaces of the first connecting component are connected, and the second and third interfaces are connected, and the first and second interfaces of the first connecting component are connected, and the third and fourth interfaces are connected, and the first and second interfaces of the first three-way valve are connected, and the first and second interfaces of the second three-way valve are connected, the corresponding mode is the fourth waterway mode.

[0079] Please see Figure 3 In one embodiment of the present invention, a water circuit control method for a vehicle non-integrated heat pump system is also proposed, which can be applied to the water circuit control system for the vehicle non-integrated heat pump system described above. The water circuit control method for the vehicle non-integrated heat pump system includes the following steps.

[0080] Step S10: Control the first connecting component according to the temperature of the coolant in the motor water circuit and the temperature of the coolant in the battery water circuit, so that the motor water circuit and the battery water circuit are connected or disconnected.

[0081] Step S20: Control the second connecting component according to the temperature of the coolant in the battery water circuit and the temperature of the coolant in the crew cabin water circuit, so that the battery water circuit and the crew cabin water circuit are connected or disconnected.

[0082] It can be seen that by dynamically switching and coordinating the first connecting component 10 and the second connecting component 20, the problems of low heat source utilization efficiency, slow response and difficulty in inter-module coordination under the traditional fixed logic control strategy are effectively solved. This significantly improves the adaptive capability, energy utilization efficiency and passenger comfort of the vehicle thermal management system, while enhancing the system's versatility and scalability under different non-integrated architectures.

[0083] In summary, this invention proposes a water circuit control system and method for a vehicle non-integrated heat pump system. A first connecting component connects the motor water circuit and the battery water circuit, enabling the determination of whether the two circuits are connected. A second connecting component connects the battery water circuit and the passenger compartment water circuit, enabling the determination of whether the two circuits are connected. Furthermore, the controller controls the first and second connecting components based on the temperatures of the coolant in the motor water circuit, the battery water circuit, and the passenger compartment water circuit, thereby achieving switching between different water circuit modes.

[0084] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can 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 those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A water circuit control system for a non-integrated heat pump system in a vehicle, comprising a motor water circuit, a battery water circuit, and a passenger compartment water circuit, characterized in that, The water circuit control system also includes: The first connecting component is connected between the motor water circuit and the battery water circuit to control whether the motor water circuit and the battery water circuit are connected. The second communication component is connected between the battery water circuit and the crew cabin water circuit to control whether the battery water circuit and the crew cabin water circuit are connected. The controller is used to control the first connecting component based on the temperature of the coolant in the motor water circuit and the temperature of the coolant in the battery water circuit; the controller is also used to control the second connecting component based on the temperature of the coolant in the battery water circuit and the temperature of the coolant in the crew cabin water circuit.

2. The water circuit control system of the vehicle non-integrated heat pump system according to claim 1, characterized in that, The first connecting component is a four-way valve. When the first and second ports of the four-way valve are connected to the motor water circuit and the third and fourth ports are connected to the battery water circuit, the motor water circuit and the battery water circuit are not connected. When the first and fourth ports of the four-way valve are connected between the motor water circuit and the battery water circuit, and the second and third ports are connected between the motor water circuit and the battery water circuit, the connection between the motor water circuit and the battery water circuit is controlled.

3. The water circuit control system of the vehicle non-integrated heat pump system according to claim 2, characterized in that, The second communication component is a four-way valve. When the first and second ports of the four-way valve are connected to the battery water circuit and the third and fourth ports are connected to the crew cabin water circuit, the battery water circuit and the crew cabin water circuit are not connected. When the first and fourth ports of the four-way valve are connected between the battery water circuit and the crew cabin water circuit, and the second and third ports are connected between the battery water circuit and the crew cabin water circuit, the connection between the battery water circuit and the crew cabin water circuit is controlled.

4. The water circuit control system of the vehicle non-integrated heat pump system according to claim 2, characterized in that, The second connecting component is a three-way valve. The first and second ports of the first three-way valve are connected between the battery water circuit and the crew cabin water circuit. When the first and second ports of the second three-way valve are connected between the battery water circuit and the crew cabin water circuit, the connection between the battery water circuit and the crew cabin water circuit is controlled.

5. The water circuit control system of the vehicle non-integrated heat pump system according to claim 3, characterized in that, The controller is also used to control the first interface and the second interface of the first connecting component to connect, and the third interface and the fourth interface to connect, when the temperature difference between the temperature of the coolant in the motor water circuit and the temperature of the coolant in the battery water circuit is less than a preset first temperature threshold. And when the temperature difference between the coolant temperature in the battery water circuit and the coolant temperature in the cabin water circuit is less than a preset second temperature threshold, the first and second interfaces of the second communication component are connected, and the third and fourth interfaces are connected.

6. The water circuit control system of the vehicle non-integrated heat pump system according to claim 3, characterized in that, The controller is also used to control the first interface and the second interface of the first connecting component to connect, and the third interface and the fourth interface to connect, when the temperature difference between the temperature of the coolant in the motor water circuit and the temperature of the coolant in the battery water circuit is less than a preset first temperature threshold. And when the temperature difference between the coolant temperature in the battery water circuit and the coolant temperature in the cabin water circuit is greater than or equal to a preset second temperature threshold, the first and fourth interfaces of the second communication component are connected, and the second and third interfaces are connected.

7. The water circuit control system of the vehicle non-integrated heat pump system according to claim 3, characterized in that, The controller is also configured to connect the first and fourth interfaces of the first connecting component and connect the second and third interfaces when the temperature difference between the coolant temperature in the motor water circuit and the coolant temperature in the battery water circuit is greater than or equal to a preset first temperature threshold. And when the temperature difference between the coolant temperature in the battery water circuit and the coolant temperature in the cabin water circuit is less than a preset second temperature threshold, the first and second interfaces of the second communication component are connected, and the third and fourth interfaces are connected.

8. The water circuit control system of the vehicle non-integrated heat pump system according to claim 1, characterized in that, The controller is also configured to connect the first and fourth interfaces of the first connecting component and connect the second and third interfaces when the temperature difference between the coolant temperature in the motor water circuit and the coolant temperature in the battery water circuit is greater than or equal to a preset first temperature threshold. And when the temperature difference between the coolant temperature in the battery water circuit and the coolant temperature in the cabin water circuit is greater than or equal to a preset second temperature threshold, the first and fourth interfaces of the second communication component are connected, and the second and third interfaces are connected.

9. The water circuit control system of the vehicle non-integrated heat pump system according to claim 4, characterized in that, The controller is further configured to, when the temperature difference between the coolant temperature in the motor water circuit and the coolant temperature in the battery water circuit is less than a preset first temperature threshold, control the first and second interfaces of the first connecting component to connect, and the third and fourth interfaces to connect; otherwise, control the first and fourth interfaces of the first connecting component to connect, and the second and third interfaces to connect. And when the temperature difference between the coolant in the battery water circuit and the coolant in the cabin water circuit is greater than or equal to a preset second temperature threshold, the first and second ports of the first three-way valve are connected, and the first and second ports of the second three-way valve are also connected.

10. A water circuit control method for a vehicle non-integrated heat pump system, employing the water circuit control system for a vehicle non-integrated heat pump system as described in any one of claims 1 to 9, characterized in that, The water circuit control method for the non-integrated heat pump system of the vehicle includes: The first connecting component is controlled according to the temperature of the coolant in the motor water circuit and the temperature of the coolant in the battery water circuit, so that the motor water circuit and the battery water circuit are connected or disconnected. The second connecting component is controlled according to the temperature of the coolant in the battery water circuit and the temperature of the coolant in the crew cabin water circuit, so that the battery water circuit and the crew cabin water circuit are connected or disconnected.

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