Vehicle cooling system, control method and cooling liquid filling system

Abstract

The invention discloses a vehicle cooling system, a control method and a cooling liquid filling system, and belongs to the technical field of vehicles, in the vehicle cooling system, an engine cooling loop is communicated with a warm air system cooling loop through a first four-way valve, and a motor cooling loop is communicated with a battery cooling loop through a second four-way valve; when the vehicle cooling system needs to be filled with cooling liquid, the engine cooling loop is communicated with the warm air system cooling loop through the first four-way valve, and the motor cooling loop is communicated with the battery cooling loop through the second four-way valve, so that the loop of the whole vehicle cooling system is smoother; the cooling liquid in the expansion water tank can be injected into the engine cooling loop and the warm air system cooling loop, and the cooling liquid can be injected into the motor cooling loop and the battery cooling loop, so that the cooling liquid can be fully injected, the problem that the cooling liquid is difficult to fully inject can be effectively solved, and the injection time of the cooling liquid is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-related technologies, and in particular to a vehicle cooling system, a coolant filling control method, and a coolant filling system. Background Art

[0002] With the development of hybrid vehicle models, the complexity of hybrid vehicle thermal management systems has been increasing. Especially after the emergence of dual-motor systems and even hybrid four-wheel drive models, the complexity of the vehicle's cooling system and the length of the cooling system pipelines have increased significantly compared to pure electric vehicles or pure fuel vehicles. This has brought difficulties to the refilling of coolant on the vehicle factory production line and the refilling of coolant in after-sales maintenance, and it is easy to have dead spots where the refilling is not full.

[0003] The current method of repairing fuel vehicles by directly filling the expansion tank with coolant and running the engine can no longer guarantee that the entire cooling system is filled with coolant, especially after the multi-way water valve is used on the vehicle, it is difficult to directly fill the vehicle with coolant. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a vehicle cooling system that can make the circuit of the entire vehicle cooling system more unobstructed and facilitate the state of full filling of coolant.

[0005] The invention also provides a coolant filling control method and a coolant filling system.

[0006] A vehicle cooling system according to a first aspect of an embodiment of the present invention comprises an expansion tank, an engine cooling circuit, a heating system cooling circuit, a motor cooling circuit and a battery cooling circuit; The engine cooling circuit is connected to the heating system cooling circuit via a first four-way valve, and the first four-way valve is configured to connect the engine cooling circuit to the heating system cooling circuit, or disconnect the engine cooling circuit from the heating system cooling circuit; The motor cooling circuit is connected to the battery cooling circuit via a second four-way valve, and the second four-way valve is configured to connect the motor cooling circuit to the battery cooling circuit, or disconnect the motor cooling circuit from the battery cooling circuit; The expansion water tank is connected to the engine cooling circuit and the motor cooling circuit respectively through a water supply pipe; Wherein, the engine cooling circuit comprises an engine, an engine water pump, a thermal management module and a first radiator, a water inlet end of the engine water pump is connected to one end of the first radiator, a water outlet end of the engine water pump is connected to a water inlet end of the engine, the thermal management module is connected between the water outlet end of the engine and the other end of the first radiator, and the engine cooling circuit and the heating system cooling circuit are respectively provided with air pipes connected to the return air port of the expansion water tank; The motor cooling circuit includes a motor, a motor water pump, a second radiator and a three-way valve, wherein a water inlet end of the motor water pump is connected to one end of the second radiator, a water outlet end of the motor water pump is connected to a water inlet end of the motor, a water inlet end of the three-way valve is connected to a water outlet end of the motor, a first water outlet end of the three-way valve is connected to the other end of the second radiator, a second water outlet end of the three-way valve is connected to a water inlet end of the motor water pump, and the motor cooling circuit is provided with an air pipe connected to a return air port of the expansion water tank.

[0007] The vehicle cooling system according to the embodiment of the present invention has at least the following beneficial effects: In the vehicle cooling system, the engine cooling circuit and the heater system cooling circuit are connected through a first four-way valve, which can connect the engine cooling circuit and the heater system cooling circuit, or disconnect the connection between the engine cooling circuit and the heater system cooling circuit; the motor cooling circuit and the battery cooling circuit are connected through a second four-way valve, which can connect the motor cooling circuit and the battery cooling circuit, or disconnect the connection between the motor cooling circuit and the battery cooling circuit; the expansion water tank is connected to the engine cooling circuit and the motor cooling circuit through a water supply pipe. When it is necessary to add coolant to the vehicle cooling system, the engine cooling circuit and the heater system cooling circuit are connected through the first four-way valve, and the motor cooling circuit and the battery cooling circuit are connected through the second four-way valve. Since in the engine cooling circuit, the thermal management module is connected between the water outlet of the engine and the first radiator, and in the motor cooling circuit, the water inlet end of the three-way valve is connected to the water outlet end of the motor, the first water outlet end of the three-way valve is connected to the other end of the second radiator, and the second water outlet end of the three-way valve is connected to the water inlet end of the motor water pump, when adding coolant, by controlling the opening of the thermal management module and the three-way valve, the circuit of the entire vehicle cooling system can be made more unobstructed, so that the coolant in the expansion water tank can be added to the engine cooling circuit and the heater system cooling circuit, and the coolant can be added to the motor cooling circuit and the battery cooling circuit, so that the coolant is easily filled. The problem of the coolant being difficult to fill can be effectively solved and the time for filling the coolant can be reduced.

[0008] According to some embodiments of the present invention, the engine cooling circuit also includes a first bypass branch and a turbocharger, the turbocharger and two ports of the first four-way valve are both arranged on the first bypass branch, one end of the first bypass is connected to the water inlet of the engine water pump, and the other end is connected to the water outlet of the thermal management module.

[0009] According to some embodiments of the present invention, the warm air system cooling circuit includes a warm air water pump, a heater and a warm air core, the water inlet end of the warm air water pump is connected to one of the ports of the first four-way valve, the water outlet end of the warm air water pump is connected to the heater and the warm air core in sequence, and the outlet of the warm air core is connected to another port of the first four-way valve.

[0010] According to some embodiments of the present invention, two ports of the second four-way valve are connected between the motor and the three-way valve, and the other two ports are connected to the battery cooling circuit.

[0011] According to some embodiments of the present invention, the battery cooling circuit includes a power battery, a battery water pump and a refrigerator, the battery water pump is connected between the refrigerator and the power battery, the water inlet end of the refrigerator is connected to one of the ports of the second four-way valve, and the water outlet end of the power battery is connected to another port of the second four-way valve.

[0012] A coolant filling control method for a vehicle cooling system according to a second aspect of an embodiment of the present invention is applied to the vehicle cooling system described in the first aspect of the embodiment, and the coolant filling control method includes: In response to a control instruction of a coolant filling mode, the first four-way valve is controlled to switch to a state where the engine cooling circuit and the heater system cooling circuit are connected, the second four-way valve is controlled to switch to a state where the motor cooling circuit and the battery cooling circuit are connected, the opening of the thermal management module is controlled to reach a maximum value, and the opening of the three-way valve is controlled to reach a first preset value; The vehicle cooling system is evacuated so that the coolant in the expansion tank is added to the engine cooling circuit and the heater system cooling circuit, and the coolant is added to the motor cooling circuit and the battery cooling circuit.

[0013] The coolant filling control method according to the embodiment of the present invention has at least the following beneficial effects: When it is necessary to add coolant to the vehicle cooling system, in response to the control instruction of the coolant filling mode, the following steps are first performed: the first four-way valve is controlled to switch to a state where the engine cooling circuit and the heater system cooling circuit are connected, the second four-way valve is controlled to switch to a state where the motor cooling circuit and the battery cooling circuit are connected, the opening of the thermal management module is controlled to reach a maximum value, and the opening of the three-way valve is controlled to reach a first preset value; after the first four-way valve, the second four-way valve, the thermal management module and the three-way valve meet the requirements, the vehicle cooling system is vacuumed so that the coolant in the expansion water tank is added to the engine cooling circuit and the heater system cooling circuit, and the coolant is added to the motor cooling circuit and the battery cooling circuit, thereby achieving the coolant filling to a full liquid state, which can effectively solve the problem of difficulty in filling the vehicle cooling system with coolant, reduce the time for coolant filling, and effectively solve the problem of insufficient coolant filling, especially for after-sales maintenance.

[0014] According to some embodiments of the present invention, before the vacuuming of the vehicle cooling system, the method further comprises: Detecting the openings of the first four-way valve, the second four-way valve, the thermal management module, and the three-way valve; When the opening degree of any one of the first four-way valve, the second four-way valve, the thermal management module and the three-way valve does not reach a preset opening degree, the coolant filling mode is terminated and a fault message is issued.

[0015] According to some embodiments of the present invention, the coolant filling control method further includes: Acquiring status information of the vehicle cooling system; When the vehicle cooling system is currently in a normal state, performing the vacuuming process on the vehicle cooling system; When the vehicle cooling system is currently in an abnormal state, component failure information corresponding to the abnormal state is obtained, and the coolant filling mode is controlled to exit.

[0016] According to some embodiments of the present invention, the heating system cooling circuit comprises a heating water pump, a heater and a heating core, the water inlet of the heating water pump is connected to one of the ports of the first four-way valve, the water outlet of the heating water pump is connected to the heater and the heating core in sequence, and the outlet of the heating core is connected to another port of the first four-way valve; The coolant filling control method further includes: In response to a control instruction for fault diagnosis, the first four-way valve is controlled to switch to a state of connecting the engine cooling circuit and the heating system cooling circuit, and the opening degree of the thermal management module is controlled to reach a maximum value; After a first preset time, the duty cycle of the heater water pump is controlled to reach a second preset value, and the speed of the engine water pump is controlled to reach a preset speed, and the states of the first four-way valve, the heater water pump, the thermal management module and the engine water pump are determined; When the state of any one of the first four-way valve, the heater water pump, the thermal management module and the engine water pump is abnormal, it is determined that a part is faulty and a code of the faulty part is sent.

[0017] According to some embodiments of the present invention, the battery cooling circuit includes a power battery, a battery water pump and a refrigerator, the battery water pump is connected between the refrigerator and the power battery, the water inlet end of the refrigerator is connected to one of the ports of the second four-way valve, and the water outlet end of the power battery is connected to another port of the second four-way valve; The coolant filling control method further includes: In response to a control instruction for fault diagnosis, controlling the second four-way valve to switch to a state of connecting the motor cooling circuit and the battery cooling circuit, and controlling the opening of the three-way valve to reach the first preset value; After a second preset time, the duty ratio of the motor water pump and the battery water pump is controlled to reach a third preset value, and the states of the second four-way valve, the three-way valve, the motor water pump and the battery water pump are determined; When the state of any one of the second four-way valve, the three-way valve, the motor water pump and the battery water pump is abnormal, it is determined that a component is faulty, and a code of the faulty component is sent.

[0018] A coolant filling system according to a third aspect of an embodiment of the present invention includes: an automatic temperature controller configured to control the first four-way valve to switch to a state of connecting the engine cooling circuit and the heating system cooling circuit in response to a control instruction of a coolant filling mode; a vehicle controller configured to control the second four-way valve to switch to a state of connecting the motor cooling circuit and the battery cooling circuit in response to a control instruction of a coolant filling mode, and to control the opening of the three-way valve to reach a first preset value; an engine management module, configured to control the opening degree of the thermal management module to reach a maximum value in response to a control instruction of a coolant filling mode; The filling machine is configured to perform a vacuum treatment on the vehicle cooling system, so that the coolant in the expansion water tank is filled into the engine cooling circuit and the heater system cooling circuit, and the coolant is filled into the motor cooling circuit and the battery cooling circuit.

[0019] The coolant filling system according to the embodiment of the present invention has at least the following beneficial effects: In response to the control instruction of the coolant filling mode, the first four-way valve is controlled by the automatic temperature controller to switch to the state of connecting the engine cooling circuit and the heater system cooling circuit; the second four-way valve is controlled by the vehicle controller to switch to the state of connecting the motor cooling circuit and the battery cooling circuit, and the opening of the three-way valve is controlled to reach a first preset value; the opening of the thermal management module is controlled by the energy management module to reach a maximum value; after the first four-way valve, the second four-way valve, the thermal management module and the three-way valve meet the requirements, the vehicle cooling system is vacuumed by the filling machine, so that the coolant in the expansion water tank is filled into the engine cooling circuit and the heater system cooling circuit, and the coolant is filled into the motor cooling circuit and the battery cooling circuit, so that the coolant is filled to a full liquid state, which can effectively solve the problem of difficulty in filling the coolant in the vehicle cooling system and reduce the time for coolant filling. Especially for after-sales maintenance, it can effectively solve the problem of insufficient coolant filling.

[0020] According to the fourth aspect of the embodiment of the present invention, the control device includes a memory, a processor, and a program stored in the memory and executable on the processor. When the program is executed by the processor, the coolant filling control method of the vehicle cooling system as described in the second aspect of the embodiment is implemented.

[0021] Since the control device adopts all the technical solutions of the coolant filling control method of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be repeated here.

[0022] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the principle of an engine cooling circuit and a heating system cooling circuit according to an embodiment of the present invention; Figure 2 is a schematic diagram of the principle of a motor cooling circuit and a battery cooling circuit according to an embodiment of the present invention; Figure 3 is a flow chart of a coolant filling control method for a vehicle cooling system according to an embodiment of the present invention; Figure 4 is a flow chart of determining fault information in a coolant filling control method according to an embodiment of the present invention; Figure 5 is a schematic diagram of a control system of a coolant filling control method according to an embodiment of the present invention; Figure 6is a specific example flow chart of a method for controlling the filling of coolant in a vehicle cooling system according to an embodiment of the present invention; Figure 7 is a flow chart of fault diagnosis in a coolant filling control method according to an embodiment of the present invention; Figure 8 It is a flowchart of fault diagnosis in a coolant filling control method according to another embodiment of the present invention. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] In the description of the present invention, it is necessary to understand that the orientation or positional relationship indicated by the terms upper, lower, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present invention, the meaning of "more than" is more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0027] In the description of the present invention, it should be noted that the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments.

[0029] Reference Figure 1 and Figure 2As shown, the vehicle cooling system of the embodiment of the present invention includes an engine cooling circuit, a heating system cooling circuit, a motor cooling circuit and a battery cooling circuit. The engine cooling circuit and the heating system cooling circuit are connected through a first four-way valve, and the motor cooling circuit and the battery cooling circuit are connected through a second four-way valve. Among them, the engine cooling circuit is used to dissipate heat from the engine of the vehicle, the heating system cooling circuit is used to dissipate heat from the heating system of the vehicle, the motor cooling circuit is used to dissipate heat from the driving motor of the vehicle, and the battery cooling circuit is used to dissipate heat from the power battery of the vehicle, which is suitable for electric vehicles or hybrid vehicles.

[0030] Reference Figure 1 As shown, the engine cooling circuit includes an engine, an engine water pump, a thermal management module (TMM) and a first radiator, the water inlet of the engine water pump is connected to the water outlet of the first radiator, the water outlet of the engine water pump is connected to the water inlet of the engine, and the thermal management module is connected between the water outlet of the engine and the water inlet of the first radiator. Specifically, the water inlet of the thermal management module is connected to the water outlet of the engine, and the water outlet of the thermal management module is connected to the water inlet of the first radiator.

[0031] The coolant circulates in the engine cooling circuit, absorbs and removes the heat generated by the engine, and then dissipates the heat into the air through the first radiator. The engine water pump pressurizes the coolant to ensure that it circulates in the circuit. The first radiator is a heat exchanger that achieves cooling by exchanging heat between air and coolant. In some embodiments, the first radiator may be provided with a fan to improve the heat dissipation capacity of the first radiator.

[0032] Reference Figure 1 As shown, the engine cooling circuit also includes a first bypass branch and a second bypass branch, the first bypass branch includes a turbocharger (TURBO) and a first four-way valve, and the second bypass branch includes an engine oil cooler. Specifically, the thermal management module is provided with three water outlet ports, port 4 of the first four-way valve is connected to the water inlet of the engine water pump, port 1 of the first four-way valve is connected to the water outlet of the turbocharger, the water inlet of the turbocharger is connected to one of the water outlet ports of the thermal management module, the water inlet of the engine oil cooler is connected to another water outlet port of the thermal management module, the water outlet of the engine oil cooler is connected to the water inlet of the engine water pump, and the last water outlet port of the thermal management module is connected to the first radiator.

[0033] Reference Figure 1As shown, the heating system cooling circuit includes a heating water pump, a heater and a heating core, the water inlet end of the heating water pump is connected to port 2 of the first four-way valve, the water outlet end of the heating water pump is connected to one end of the heater, the other end of the heater is connected to one end of the heating core, and the other end of the heating core is connected to port 3 of the first four-way valve, thereby forming a heating system cooling circuit. It should be noted that the heater used in the embodiment is a PTC heating device, and its working power is 5kw. The heating core includes a front heating core and a rear heating core, and the front heating core and the rear heating core are connected in parallel.

[0034] When port 1 of the first four-way valve is connected with port 4, and port 2 is connected with port 3, the first four-way valve is in the first position, the engine cooling circuit is disconnected from the heater system cooling circuit, and the engine cooling circuit and the heater system cooling circuit work independently; when port 1 of the first four-way valve is connected with port 2, and port 3 is connected with port 4, the first four-way valve is in the second position, and the engine cooling circuit and the heater system cooling circuit are connected.

[0035] In addition, the expansion water tank is connected to the engine cooling circuit through the first water supply pipe. Specifically, the first water supply pipe is connected between the water outlet of the first radiator and the water inlet of the engine water pump, and the engine cooling circuit is provided with a coolant filling port connected to the first water supply pipe. The expansion water tank is provided with a return air port, and the engine cooling circuit and the heating system cooling circuit are respectively provided with air pipes connected to the return air port of the expansion water tank. Figure 1 In the illustrated embodiment, the engine, the thermal management module, the first radiator and the heater core are respectively provided with air pipes, and the pipes shown by the dotted lines in the figure are air pipes. There is no separate water supply pipe in the heater system cooling circuit, and an expansion water tank is required to supply liquid to the engine cooling circuit and the heater system cooling circuit.

[0036] Reference Figure 1 As shown, the engine water pump pumps the coolant into the engine, and is divided into three parts from the water outlet of the engine through the TMM. One part enters the first radiator, and the water returns to the engine water pump after being discharged from the first radiator; the second part enters the engine oil cooler, and the water returns to the engine water pump after being discharged from the engine oil cooler; the third part enters the turbocharger, and there are two flow directions after the water is discharged from the turbocharger.

[0037] The first flow direction of the turbocharger outlet water is that when port 1 of the first four-way valve is connected to port 4, and port 2 is connected to port 3, the engine cooling circuit is disconnected from the heater system cooling circuit, the engine cooling circuit and the heater system cooling circuit work independently, and the turbocharger outlet water directly returns to the engine water pump.

[0038] The second flow direction of the turbocharger outlet water is that when port 1 of the first four-way valve is connected to port 2, and port 3 is connected to port 4, the turbocharger outlet water enters the heater system cooling circuit, passes through the heater water pump, heater and heater core, and then returns to the engine water pump.

[0039] Among them, the return air of the first radiator, the return air of the engine and the return air of the heater core are respectively returned to the return air port of the expansion water tank through the corresponding air pipes, so as to achieve the purpose of returning air between the engine cooling circuit and the heater system cooling circuit.

[0040] Reference Figure 2 As shown, the motor cooling circuit includes a motor, a motor water pump, a second radiator and a three-way valve, the water inlet of the motor water pump is connected to the water outlet of the second radiator, the water outlet of the motor water pump is connected to the water inlet of the motor, the water inlet of the three-way valve is connected to the water outlet of the motor, the first water outlet of the three-way valve is connected to the water inlet of the second radiator, and the second water outlet of the three-way valve is directly connected to the water inlet of the motor water pump. Port 1 and port 4 of the second four-way valve are connected between the water inlet of the three-way valve and the water outlet of the motor, and ports 2 and 3 of the second four-way valve are used to connect to the battery cooling circuit.

[0041] The coolant circulates in the motor cooling circuit, absorbing and removing the heat generated by the motor, which is then dissipated through the secondary radiator. The motor water pump pressurizes the coolant and ensures that it circulates in the circuit. The motor cooling circuit is suitable for electric vehicles or hybrid vehicles with one or two motors.

[0042] Taking a dual-motor electric vehicle as an example, the motor includes a front drive motor and a rear drive motor, and the motor cooling circuit also includes a front drive inverter, a dual-motor oil cooler, a rear drive inverter and a DCDC converter (DC-to-DC Converter), wherein the front drive inverter and the dual-motor oil cooler are connected in series to form a first branch, and the DCDC converter, the rear drive inverter and the rear drive motor are connected in series to form a second branch, the first branch and the second branch are connected in parallel and connected between the water outlet of the motor water pump and port 4 of the second four-way valve, forming a motor cooling circuit for the dual motor.

[0043] Among them, the DCDC converter is a device that converts DC power into another type of DC power, which is used to adjust the voltage level to meet the power supply requirements of different electronic equipment or systems. When the motor cooling circuit is working, it is necessary to dissipate heat for the dual motor inverter, dual motor oil cooler, rear motor inverter and rear drive motor.

[0044] In addition, the motor cooling circuit also includes a first water temperature sensor, which is connected to the water outlet of the motor water pump and is used to detect the temperature of the coolant in the circuit. The working state of the second four-way valve and the three-way valve can be controlled according to the temperature of the coolant.

[0045] Reference Figure 2 As shown, the battery cooling circuit includes a power battery, a battery water pump and a refrigerator, the water inlet of the refrigerator is connected to port 3 of the second four-way valve, the water outlet of the refrigerator is connected to the water inlet of the battery water pump, the water outlet of the battery water pump is connected to the water inlet of the power battery, and the water outlet of the power battery is connected to port 2 of the second four-way valve, thereby forming a battery cooling circuit. Driven by the battery water pump, the coolant circulates in the battery cooling circuit, absorbs and takes away the heat generated by the power battery, and uses the refrigerator to exchange heat with the coolant to achieve a heat dissipation effect.

[0046] In addition, the battery cooling circuit also includes a second water temperature sensor, which is connected to the water outlet of the battery water pump and is used to detect the temperature of the coolant in the circuit. The first water temperature sensor and the second water temperature sensor can be used to control the working status of the second four-way valve and the three-way valve according to the temperature of the coolant in the motor cooling circuit and the battery cooling circuit.

[0047] It can be understood that the expansion water tank is connected to the water inlet end of the motor water pump through the second water supply pipe, the motor cooling circuit is provided with a filling port connected to the second water supply pipe, and the battery cooling circuit does not need to be provided with a separate water supply pipe. The expansion water tank can be used to replenish fluid to the motor cooling circuit and the battery cooling circuit.

[0048] The coolant in the motor cooling circuit operates as follows: the coolant is pumped out by the motor water pump and flows to the first branch and the second branch. In the first branch, the coolant enters the front drive inverter and the dual motor oil cooler; in the second branch, the coolant enters the DCDC converter, the rear motor inverter and the rear drive motor. The water outlets of the two branches are mixed and pass through the second four-way valve. When port 1 and port 4 of the second four-way valve are connected, and port 2 and port 3 are connected, the second four-way valve is in the first position, the motor cooling circuit and the battery cooling circuit are in an independent state, and the water outlets of the two drive motors flow through the second four-way valve and then enter the three-way valve. The coolant passes through the third branch directly back to the motor water pump, or passes through the second radiator and then returns to the motor water pump. Whether the coolant passes through the second radiator is determined by the opening of the three-way valve. When the opening of the three-way valve is 50%, half of the coolant flows through the second radiator, and the other half of the coolant flows directly to the motor water pump without passing through the second radiator. When port 1 and port 2 of the second four-way valve are connected, and port 3 and port 4 are connected, the second four-way valve is in the second position, and the motor cooling circuit is connected to the battery cooling circuit.

[0049] refer to Figures 3 to 8 A coolant filling control method according to an embodiment of the present invention is described, which is applicable to the vehicle cooling system of the above embodiment. The control method is described below by taking a specific example.

[0050] Reference Figure 3As shown, the coolant filling control method of the embodiment of the present invention includes but is not limited to the following steps: Step S100, in response to the control instruction of the coolant filling mode, controlling the first four-way valve to switch to a state of connecting the engine cooling circuit and the heating system cooling circuit, controlling the second four-way valve to switch to a state of connecting the motor cooling circuit and the battery cooling circuit, controlling the opening of the thermal management module to reach a maximum value, and controlling the opening of the three-way valve to reach a first preset value; Step S200, vacuuming the vehicle cooling system so that the coolant in the expansion tank is added to the engine cooling circuit and the heater system cooling circuit, and the coolant in the expansion tank is added to the motor cooling circuit and the battery cooling circuit.

[0051] Combination Figure 1 It can be understood that since the engine cooling circuit and the heater system cooling circuit are connected through the first four-way valve, the expansion water tank is connected to the engine cooling circuit, and the heater system cooling circuit does not have a separate expansion water tank for water replenishment, it is necessary to use the expansion water tank to replenish the engine cooling circuit and the heater system cooling circuit.

[0052] Based on this, when it is necessary to add coolant, a control command of the coolant filling mode is sent to the vehicle controller of the vehicle. After the vehicle controller responds to the control command, it controls the first four-way valve, the second four-way valve, the thermal management module and the three-way valve to perform corresponding operations, so that the engine cooling circuit is connected to the heating system cooling circuit, the motor cooling circuit is connected to the battery cooling circuit, the opening of the thermal management module reaches the maximum value, and the opening of the three-way valve reaches the first preset value. Among them, the opening of the thermal management module reaches the maximum value, which means that the opening is 100%, and the first preset value can be set to 40%, 50%, 60%, etc.

[0053] After the first four-way valve, the second four-way valve, the thermal management module and the three-way valve meet the above-mentioned filling conditions, step S200 is executed, and the vehicle cooling system is vacuumed by using a filling machine, so that the coolant in the expansion tank can be filled into the engine cooling circuit and the heater system cooling circuit, and the coolant in the expansion tank can be filled into the motor cooling circuit and the battery cooling circuit. Since the opening of the thermal management module reaches 100%, the opening of the three-way valve is large enough to facilitate the circulation of the coolant in the corresponding circuit, improve the circulation efficiency, and ensure that the coolant is filled to a full liquid state, which can effectively solve the problem that the vehicle cooling system is difficult to fill with coolant, and effectively reduce the time for coolant filling, especially for after-sales maintenance, it can effectively solve the problem of insufficient coolant filling.

[0054] Reference Figure 4 As shown, before the vehicle cooling system is vacuumed, the following steps are also included: Step S110, detecting the openings of the first four-way valve, the second four-way valve, the thermal management module and the three-way valve; Step S120, when the opening of any one of the first four-way valve, the second four-way valve, the thermal management module and the three-way valve does not reach the preset opening, the coolant filling mode is terminated and a fault message is issued.

[0055] It should be noted that the opening of the TMM is controlled by the water temperature of the engine cooling circuit. When the water temperature is greater than 95°C, the opening of the TMM is 100%. When the opening of the TMM is 100%, it can ensure that the first radiator is filled with coolant. The conduction position of the first four-way valve is determined by three conditions: the driving state of the vehicle, whether the driver uses heating, and the engine water temperature. When the vehicle is in engine operation, the driver turns on the air conditioning for heating, and the engine water temperature is greater than 80°C, the first four-way valve switches to the state of conducting the engine cooling circuit and the heating system cooling circuit, that is, the second position. In all other cases, the first four-way valve is in the state of disconnecting the engine cooling circuit and the heating system cooling circuit, that is, the first position. After the vehicle is parked and turned off, the state of the first four-way valve remains unchanged from the position before power-off. Only when the first four-way valve is in the second position and coolant is added, can the cooling circuit of the heating system be fully filled with coolant.

[0056] The conduction position of the second four-way valve is determined by the temperature of the motor cooling circuit and the temperature of the battery core. When the water temperature of the motor cooling circuit is greater than the maximum temperature of the battery core and the water temperature of the motor cooling circuit is less than 35°C, the second four-way valve is in the second position; or when the vehicle's power battery needs to be heated and the motor is used to heat the power battery, the second four-way valve will be in the second position. In other cases, the second four-way valve is in the first position. After the vehicle is parked and turned off, the position of the second four-way valve remains unchanged from the position before power off.

[0057] The opening of the three-way valve is determined by the temperature of the motor cooling circuit. When the water temperature of the motor cooling circuit is 38℃≤≤43℃, the three-way valve is 50% open; when the water temperature of the motor cooling circuit is >45℃, the three-way valve is 100% open; when the water temperature of the motor cooling circuit is ≤35℃, the three-way valve is 0% open. After the vehicle is parked and turned off, the opening of the three-way valve remains unchanged from the position before power-off. When the first four-way valve is in the second position and the second four-way valve is in the second position and the opening of the three-way valve reaches 50%, add coolant to ensure that the coolant of the entire vehicle cooling system is full.

[0058] Before adding coolant, it is necessary to detect the opening of the first four-way valve, the second four-way valve, the thermal management module and the three-way valve to determine whether the aforementioned filling conditions are met. The opening of the first four-way valve and the second four-way valve represents the opening in the conduction position. For example, when the opening of the first four-way valve is 100%, it means that the engine cooling circuit and the heating system cooling circuit are fully connected. When the opening of the second four-way valve is 100%, it means that the motor cooling circuit and the battery cooling circuit are fully connected.

[0059] Among them, if the opening of the first four-way valve, the second four-way valve and the thermal management module does not reach the preset opening, it means that the opening of the first four-way valve, the second four-way valve and the thermal management module does not reach 100%, and if the opening of the three-way valve does not reach the preset opening, it means that the opening of the three-way valve does not reach 50%. When the opening of any one of the first four-way valve, the second four-way valve, the thermal management module and the three-way valve does not reach the preset opening, it means that there is a risk of insufficient coolant filling due to insufficient opening, so the control stops the coolant filling mode, the above step S200 is not executed, and a fault message is issued, such as sending a message of stopping the coolant filling mode to the driver through the vehicle system, or a fault message of a component.

[0060] The coolant filling control method in the embodiment further includes the following steps: Obtain status information of the vehicle cooling system; when the vehicle cooling system is currently in a normal state, perform vacuum processing on the vehicle cooling system; when the vehicle cooling system is currently in an abnormal state, obtain component failure information corresponding to the abnormal state, and control the exit of the coolant filling mode.

[0061] It is understandable that before the filling machine performs vacuum extraction, it is necessary to understand the working status of the vehicle cooling system. Therefore, in the embodiment, it is necessary to obtain the status information of the vehicle cooling system, for example, by communicating with the vehicle controller to obtain parameter information such as each valve body, pump body, water temperature, etc. in the vehicle cooling system.

[0062] If the various parameters of the vehicle cooling system are within the normal range, it means that the vehicle cooling system is currently in a normal state, and the filling machine follows the set program to perform the vacuuming-pressure-maintaining-filling-back suction process to fill the coolant; if the various parameters of the vehicle cooling system are not within the normal range, it means that the vehicle cooling system is currently in an abnormal state, and the component failure information corresponding to the abnormal state is obtained, and the coolant filling mode is controlled to exit. For example, when the thermal management module cannot work normally, the fault information of the thermal management module is fed back to the filling machine and the vehicle controller, and the filling machine is controlled to stop.

[0063] Reference Figure 5As shown, in the embodiment of the present invention, the TMM, the first four-way valve, the second four-way valve, the three-way valve and each water pump respectively perform the above-mentioned coolant filling process under the control of the automatic temperature controller (ATC), the engine management module (EMS) and the vehicle control unit (VCU), wherein the first four-way valve and the heater water pump are controlled by the ATC, the engine water pump and the TMM are controlled by the EMS, and the second four-way valve, the three-way valve, the motor water pump and the battery water pump are controlled by the VCU.

[0064] The following is a specific explanation using the process of vacuum filling coolant on the production line as an example.

[0065] Reference Figure 6 As shown, when the vehicle production line is vacuum filled, the vehicle needs to turn on the IG ON mode, the filling machine signal line is connected to the vehicle diagnostic interface, and the filling gun head is installed on the expansion tank. After the operator presses the start button, the filling machine communicates with the vehicle and starts to vacuum. After the vehicle receives the diagnostic protocol agreed with the filling machine, it sends the command to the vehicle control unit VCU. The VCU controls the second four-way valve to open to the second position, and controls the opening of the three-way valve to reach 50%. At the same time, it sends the signal of Vacuum FillCoolant = 1 to EMS and ATC. After receiving this signal, EMS and ATC control the opening of TMM to 100% respectively, and control the first four-way valve to switch to the second position. At the same time, after the opening of the first four-way valve and TMM meets the requirements, ATC and EMS need to feedback Vacuum FillCoolantSt = 1, that is, in the vacuum filling mode, the normal signal is sent to VCU, and the opening of the second four-way valve and the three-way valve is determined by VCU. VCU judges the status of each part 25s after sending the Vacuum FillCoolant = 1 signal. If the opening degree of any part does not meet the requirements, a signal of Vacuum FillCoolantSt=2 is issued, that is, the vacuum filling mode cannot be entered and the code of the faulty part is fed back to the VCU.

[0066] After the filling command is issued, the filling machine needs to confirm whether the vehicle has entered the vacuum filling state. 30 seconds after the filling machine issues the filling command, it needs to send the agreed command again to ask whether the vehicle has entered the vacuum filling state. If the vehicle status is normal, the entire vehicle sends positive feedback to the filling machine; if there is an abnormality in the vehicle parts, the entire vehicle sends negative feedback to the filling machine.

[0067] After receiving positive feedback, the filling machine performs the vacuum-maintaining-filling-back-suction process to fill the coolant according to the set program. After the filling is completed, the operator presses the end button, and the filling machine sends a command to control the vehicle to exit the vacuum filling mode. The VCU, ATC and EMS control the corresponding valve body to return to the initial position, and the vehicle enters the next process.

[0068] After receiving negative feedback, the filling machine needs to inquire about the fault status of the parts again according to the agreed service. The VCU will feedback the fault reported by the second four-way valve, three-way valve, EMS or ATC to the filling machine, and the filling machine will alarm and control the VCU to exit the filling mode through instructions. The name of the faulty part is displayed on the filling machine display screen, which is convenient for the operator to repair.

[0069] In some embodiments, when the vehicle is powered off, each controller controls each valve body to return to a circuit-connected state. When the vehicle in this state is vacuumed and refilled on the production line, it does not need to communicate with the refilling machine and can be vacuumed and refilled directly.

[0070] Reference Figure 7 As shown, the coolant filling control method in the embodiment further includes the following steps: Step S300, in response to the control instruction of the fault diagnosis, controlling the first four-way valve to switch to a state of connecting the engine cooling circuit and the heating system cooling circuit, and controlling the opening degree of the thermal management module to reach a maximum value; Step S400, after a first preset time, controlling the duty cycle of the heater water pump to reach a second preset value, controlling the speed of the engine water pump to reach a preset speed, and determining the states of the first four-way valve, the heater water pump, the thermal management module, and the engine water pump; Step S500: When the state of any one of the first four-way valve, the heater water pump, the thermal management module and the engine water pump is abnormal, it is determined that the part is faulty and the code of the faulty part is sent.

[0071] It is understandable that when the coolant of the vehicle cooling system leaks, the cooling effect of the vehicle cooling system is reduced, and the vehicle cooling system needs to be inspected and repaired. In the specific operation, the engine cooling circuit and the heating system cooling circuit are inspected. First, the first four-way valve needs to be controlled to switch to the state of connecting the engine cooling circuit and the heating system cooling circuit, and the opening of the thermal management module needs to be controlled to reach the maximum value. Then the duty cycle of the heating water pump is controlled to reach the second preset value, and the speed of the engine water pump is controlled to reach the preset speed, and the operation information of the first four-way valve, the heating water pump, the thermal management module and the engine water pump is obtained, and the working state of the first four-way valve, the heating water pump, the thermal management module and the engine water pump is determined according to the operation information. When any of the first four-way valve, the heating water pump, the thermal management module and the engine water pump is abnormal, it is determined that the part is faulty, and the code of the corresponding faulty part is sent to the detection equipment, so that the maintenance personnel can determine the faulty parts in the engine cooling circuit and the heating system cooling circuit.

[0072] Reference Figure 8 As shown, the coolant filling control method in the embodiment further includes the following steps: Step S600, in response to a fault diagnosis control instruction, controlling the second four-way valve to switch to a state of connecting the motor cooling circuit and the battery cooling circuit, and controlling the opening of the three-way valve to reach a first preset value; Step S700, after the second preset time, the duty ratio of the motor water pump and the battery water pump is controlled to reach a third preset value, and the states of the second four-way valve, the three-way valve, the motor water pump and the battery water pump are determined; Step S800: When the state of any one of the second four-way valve, the three-way valve, the motor water pump and the battery water pump is abnormal, it is determined that the part is faulty and the code of the faulty part is sent.

[0073] It is understandable that when the motor cooling circuit and the battery cooling circuit need to be inspected and repaired, it is first necessary to control the second four-way valve to switch to the state of conducting the motor cooling circuit and the battery cooling circuit, and control the opening of the three-way valve to reach the first preset value; then control the duty cycle of the motor water pump and the battery water pump to reach the third preset value, obtain the operating information of the second four-way valve, the three-way valve, the motor water pump and the battery water pump, and judge the working state of the second four-way valve, the three-way valve, the motor water pump and the battery water pump according to the operating information. When any of the second four-way valve, the three-way valve, the motor water pump and the battery water pump is abnormal, it is determined that the part is faulty, and the code of the corresponding faulty part is sent to the detection equipment, so that the maintenance personnel can determine the faulty parts in the motor cooling circuit and the battery cooling circuit.

[0074] The following is a specific explanation using the process of refilling coolant during after-sales vehicle maintenance as an example.

[0075] When the vehicle fails and the coolant is insufficient, the diagnostic instrument needs to be used to enter the maintenance and filling mode to add coolant. After the diagnostic instrument is connected to the vehicle, the vehicle enters the ready state. The operator clicks the button on the diagnostic instrument to enter the maintenance and filling mode. At this time, the diagnostic instrument sends a command to the VCU through the agreed protocol. After receiving the maintenance and filling signal, the VCU sends the Service FillCoolant=1 signal to the EMS and ATC. After receiving the Service FillCoolant=1 signal, the ATC controls the first four-way valve to switch to the second position. After receiving the Service FillCoolant=1 signal, the EMS controls the opening of the TMM to 100%; at the same time, the VCU controls the second four-way valve to switch to the second position, and controls the opening of the three-way valve to 50%.

[0076] The EMS controls the opening of the TMM to 100%, and after a delay of 2 minutes, controls the engine electric water pump to 3000rpm; the first four-way valve switches to the second position, and after a delay of 2 minutes, controls the duty cycle of the heater water pump to 85%, and the VCU controls the second four-way valve to switch to the second position, and after a delay of 2 minutes, controls the duty cycle of the motor water pump and the battery water pump to 85%.

[0077] After receiving the Service FillCoolant=1 signal and 2.5 minutes have passed, the EMS determines the status of the TMM and the engine water pump. If the TMM and the engine water pump have reached the target opening, it will feedback to the VCU that the filling mode has been entered (ServiceFillCoolantst=1); if the opening of either the TMM or the engine water pump has not reached the target opening, it will feedback that it is unable to enter the service filling mode (Service FillCoolantst=2) and feedback the fault part code (such as TMM failure, engine water pump failure, etc.).

[0078] After receiving the Service FillCoolant=1 signal and 2.5 minutes have passed, ATC determines the status of the first four-way valve and the heater water pump. If the first four-way valve and the heater water pump have reached the target opening, it will feedback to the VCU that it has entered the filling mode (Service FillCoolantst=1); if the opening of any of the first four-way valve and the heater water pump has not reached the target opening, it will feedback that it cannot enter the maintenance filling mode (Service FillCoolantst=2) and feedback the fault part code (such as first four-way valve failure, heater water pump failure, etc.).

[0079] 2.5 minutes after the diagnostic instrument issues a command, it is necessary to confirm whether the vehicle has entered the maintenance and refueling state. The command is sent to the VCU through the agreed diagnostic service. After receiving the diagnostic signal, the VCU determines the state of the corresponding water valve and water pump controlled by the VCU and the state of the EMS and ATC feedback. If the water pump and the water pump are both in the correct opening position, the VCU sends positive feedback to the diagnostic instrument, and the diagnostic instrument displays OK; if the state of the water pump, water pump or EMS, ATC feedback is incorrect, the vehicle sends negative feedback to the diagnostic instrument, and the diagnostic instrument displays NO OK. If the diagnostic instrument asks the VCU whether to enter the refueling mode when the command signal is issued for less than 2.5 minutes, the VCU feedback is NO OK and there is no fault status; if the time is ≥2.5 minutes, whether the VCU is asked whether to enter the refueling mode, the VCU feedback is NO OK and there is a fault status or OK without fault.

[0080] After the operator sees the OK command feedback from the diagnostic instrument, he needs to pay attention to the liquid level in the expansion tank. If the liquid level drops, coolant needs to be added. After receiving the NO OK command, the operator needs to click on the diagnostic instrument again and send a service command to the VCU to inquire which part is faulty. The VCU needs to feedback the faulty part to the diagnostic instrument. The diagnostic instrument displays the faulty part code and sends a command to control the entire vehicle to exit the maintenance and filling mode.

[0081] After entering the maintenance filling mode, the operator adds coolant to the middle of the MAX line and the MIN line until the coolant level is stable for 10 minutes and does not drop any more, indicating that the coolant filling is complete.

[0082] After the filling is completed, the operator operates the diagnostic instrument to send a command to exit the filling mode signal to the VCU. The VCU controls the position of the second four-way valve, the opening of the three-way valve, the duty cycle of the motor water pump and the battery water pump according to the needs of the vehicle (if there is no demand, it returns to the default mode). At the same time, the exit filling mode signal (Service FillCoolant=0) is sent to the EMS and ATC. The EMS and ATC control the operation of their respective water valves and water pumps according to the use needs of the vehicle (if there is no demand, it returns to the default mode).

[0083] It should be noted that, in some embodiments, the diagnostic instrument or the filling machine directly controls the opening of the water valves and water pumps on the vehicle through diagnostic instructions. If the water valves and water pumps on the vehicle are located under different controllers, the diagnostic instrument is required to communicate with the different controllers, rather than the method of communicating between the controllers through CAN signals as mentioned in the embodiments. The diagnostic instrument only communicates with the VCU of the vehicle. The way in which the diagnostic instrument or the filling machine communicates with different controllers of the vehicle to control the controlled components thereunder is consistent with the method in which the diagnostic instrument of the present application communicates with the VCU to control the second four-way valve and the motor water pump.

[0084] An embodiment of the present invention also provides a coolant filling system, which is applied to the vehicle cooling system of the above embodiment and can execute the coolant filling control method of the vehicle cooling system provided in the above embodiment. Specifically, the coolant filling system includes a vehicle controller, an automatic temperature controller, an engine management module and a filling machine.

[0085] The automatic temperature controller is configured to control the first four-way valve to switch to a state of connecting the engine cooling circuit and the heating system cooling circuit in response to a control instruction of the coolant filling mode.

[0086] The vehicle controller is configured to control the second four-way valve to switch to a state of connecting the motor cooling circuit and the battery cooling circuit in response to a control instruction of the coolant filling mode, and control the opening of the three-way valve to reach a first preset value.

[0087] The engine management module is configured to control the opening degree of the thermal management module to reach a maximum value in response to a control instruction of the coolant filling mode.

[0088] The filling machine is configured to evacuate the vehicle cooling system so that the coolant in the expansion tank is filled into the engine cooling circuit and the heater system cooling circuit, and the coolant is filled into the motor cooling circuit and the battery cooling circuit.

[0089] It should be noted that the coolant filling system can also execute steps S300, S400, S500, S600, S700, S800, etc. in the coolant filling control method in the above embodiment.

[0090] In response to the control instruction of the coolant filling mode, the first four-way valve is controlled by the automatic temperature controller to switch to the state of connecting the engine cooling circuit and the heater system cooling circuit; the second four-way valve is controlled by the vehicle controller to switch to the state of connecting the motor cooling circuit and the battery cooling circuit, and the opening of the three-way valve is controlled to reach a first preset value; the opening of the thermal management module is controlled by the energy management module to reach a maximum value; after the first four-way valve, the second four-way valve, the thermal management module and the three-way valve meet the requirements, the vehicle cooling system is vacuumed by the filling machine, so that the coolant in the expansion water tank is filled into the engine cooling circuit and the heater system cooling circuit, and the coolant is filled into the motor cooling circuit and the battery cooling circuit, so that the coolant is filled to a full liquid state, which can effectively solve the problem of difficulty in filling the coolant in the vehicle cooling system and reduce the time for coolant filling. Especially for after-sales maintenance, it can effectively solve the problem of insufficient coolant filling.

[0091] An embodiment of the present invention also provides a control device, including a memory, a processor, and a program stored in the memory and executable on the processor, wherein when the program is executed by the processor, the coolant filling control method for the vehicle cooling system as described in the above embodiment is implemented.

[0092] It should be noted that the vehicle of the embodiment of the present invention has a processor and a memory, and the memory is used to store instructions. When the instructions are executed by the processor, the coolant filling control method of the vehicle cooling system of the above embodiment is executed.

[0093] Take the example that the processor and memory in the control device can be connected through a bus. The memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one disk memory, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory may optionally include a memory remotely arranged relative to the control processor, and these remote memories may be connected to the controller via a network.

[0094] The non-transient software program and instructions required to implement the control method of the above embodiment are stored in the memory, and when executed by the processor, the control method of the above embodiment is executed, for example, the control method described above is executed. Figure 3 Steps S100 to S200 of the method, Figure 4 Steps S110 to S120 of the method, Figure 7 Steps S300 to S500 of the method, Figure 8 The method includes steps S600 to S800, etc.

[0095] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0096] The vehicle cooling system, control method and control device of the embodiment of the present invention are applicable to hybrid vehicles, which may be private vehicles, such as sedans, SUVs, MPVs or pickup trucks, etc. The vehicle may also be an operating vehicle, such as a van, bus, small truck or large trailer, etc.

[0097] A computer-readable storage medium is also provided in an embodiment of the present invention. The computer-readable storage medium stores a computer program. The computer program includes program instructions. A processor executes the program instructions to implement any coolant filling control method for a vehicle cooling system provided in an embodiment of the present application.

[0098] The computer-readable storage medium may be a hard disk or memory of the domain controller in the aforementioned embodiment. The computer-readable storage medium may also be an external storage device of the domain controller, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (FlashCard), etc., equipped on the domain controller.

[0099] Since the computer program stored in the computer-readable storage medium can execute any one of the coolant filling control methods provided in the embodiments of the present application, the beneficial effects that can be achieved by any one of the coolant filling control methods provided in the embodiments of the present application can be achieved. Please refer to the previous embodiments for details and will not be repeated here.

[0100] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A vehicle cooling system, characterized in that: Including expansion tank, engine cooling circuit, heating system cooling circuit, motor cooling circuit and battery cooling circuit; The engine cooling circuit is connected to the heating system cooling circuit via a first four-way valve, and the first four-way valve is configured to connect the engine cooling circuit to the heating system cooling circuit, or disconnect the engine cooling circuit from the heating system cooling circuit; The motor cooling circuit is connected to the battery cooling circuit via a second four-way valve, and the second four-way valve is configured to connect the motor cooling circuit to the battery cooling circuit, or disconnect the motor cooling circuit from the battery cooling circuit; The expansion water tank is connected to the engine cooling circuit and the motor cooling circuit respectively through a water supply pipe; Wherein, the engine cooling circuit comprises an engine, an engine water pump, a thermal management module and a first radiator, a water inlet end of the engine water pump is connected to one end of the first radiator, a water outlet end of the engine water pump is connected to a water inlet end of the engine, the thermal management module is connected between the water outlet end of the engine and the other end of the first radiator, and the engine cooling circuit and the heating system cooling circuit are respectively provided with air pipes connected to the return air port of the expansion water tank; The motor cooling circuit includes a motor, a motor water pump, a second radiator and a three-way valve, wherein a water inlet end of the motor water pump is connected to one end of the second radiator, a water outlet end of the motor water pump is connected to a water inlet end of the motor, a water inlet end of the three-way valve is connected to a water outlet end of the motor, a first water outlet end of the three-way valve is connected to the other end of the second radiator, a second water outlet end of the three-way valve is connected to a water inlet end of the motor water pump, and the motor cooling circuit is provided with an air pipe connected to a return air port of the expansion water tank.

2. The vehicle cooling system according to claim 1, characterized in that: The engine cooling circuit also includes a first bypass branch and a turbocharger, wherein the turbocharger and two ports of the first four-way valve are both arranged on the first bypass branch, one end of the first bypass is connected to the water inlet of the engine water pump, and the other end is connected to the water outlet of the thermal management module.

3. The vehicle cooling system according to claim 1, characterized in that: The warm air system cooling circuit includes a warm air water pump, a heater and a warm air core. The water inlet end of the warm air water pump is connected to one of the ports of the first four-way valve, the water outlet end of the warm air water pump is connected to the heater and the warm air core in sequence, and the outlet of the warm air core is connected to another port of the first four-way valve.

4. The vehicle cooling system according to claim 1, characterized in that: Two ports of the second four-way valve are connected between the motor and the three-way valve, and the other two ports are connected to the battery cooling circuit.

5. The vehicle cooling system according to claim 1, characterized in that: The battery cooling circuit includes a power battery, a battery water pump and a refrigerator, the battery water pump is connected between the refrigerator and the power battery, the water inlet end of the refrigerator is connected to one of the ports of the second four-way valve, and the water outlet end of the power battery is connected to another port of the second four-way valve.

6. A method for controlling the filling of coolant in a vehicle cooling system, applied to the vehicle cooling system according to any one of claims 1 to 5, characterized in that: The coolant filling control method comprises: In response to a control instruction of a coolant filling mode, the first four-way valve is controlled to switch to a state where the engine cooling circuit and the heater system cooling circuit are connected, the second four-way valve is controlled to switch to a state where the motor cooling circuit and the battery cooling circuit are connected, the opening of the thermal management module is controlled to reach a maximum value, and the opening of the three-way valve is controlled to reach a first preset value; The vehicle cooling system is evacuated so that the coolant in the expansion tank is added to the engine cooling circuit and the heater system cooling circuit, and the coolant is added to the motor cooling circuit and the battery cooling circuit.

7. The coolant filling control method of a vehicle cooling system according to claim 6, characterized in that: Before the vehicle cooling system is vacuumed, the method further comprises: Detecting the openings of the first four-way valve, the second four-way valve, the thermal management module, and the three-way valve; When the opening degree of any one of the first four-way valve, the second four-way valve, the thermal management module and the three-way valve does not reach a preset opening degree, the coolant filling mode is terminated and a fault message is issued.

8. The coolant filling control method of a vehicle cooling system according to claim 6, characterized in that: The coolant filling control method further includes: Acquiring status information of the vehicle cooling system; When the vehicle cooling system is currently in a normal state, performing the vacuuming process on the vehicle cooling system; When the vehicle cooling system is currently in an abnormal state, component failure information corresponding to the abnormal state is obtained, and the coolant filling mode is controlled to exit.

9. The coolant filling control method of a vehicle cooling system according to claim 6, characterized in that: The heating system cooling circuit comprises a heating water pump, a heater and a heating core, the water inlet of the heating water pump is connected to one of the ports of the first four-way valve, the water outlet of the heating water pump is connected to the heater and the heating core in sequence, and the outlet of the heating core is connected to another port of the first four-way valve; The coolant filling control method further includes: In response to a control instruction for fault diagnosis, the first four-way valve is controlled to switch to a state of connecting the engine cooling circuit and the heating system cooling circuit, and the opening degree of the thermal management module is controlled to reach a maximum value; After a first preset time, the duty cycle of the heater water pump is controlled to reach a second preset value, and the speed of the engine water pump is controlled to reach a preset speed, and the states of the first four-way valve, the heater water pump, the thermal management module and the engine water pump are determined; When the state of any one of the first four-way valve, the heater water pump, the thermal management module and the engine water pump is abnormal, it is determined that a part is faulty and a code of the faulty part is sent.

10. The coolant filling control method of a vehicle cooling system according to claim 6, characterized in that: The battery cooling circuit includes a power battery, a battery water pump and a refrigerator, wherein the battery water pump is connected between the refrigerator and the power battery, a water inlet of the refrigerator is connected to one of the ports of the second four-way valve, and a water outlet of the power battery is connected to another port of the second four-way valve; The coolant filling control method further includes: In response to a control instruction for fault diagnosis, controlling the second four-way valve to switch to a state of connecting the motor cooling circuit and the battery cooling circuit, and controlling the opening of the three-way valve to reach the first preset value; After a second preset time, the duty ratio of the motor water pump and the battery water pump is controlled to reach a third preset value, and the states of the second four-way valve, the three-way valve, the motor water pump and the battery water pump are determined; When the state of any one of the second four-way valve, the three-way valve, the motor water pump and the battery water pump is abnormal, it is determined that a component is faulty, and a code of the faulty component is sent.

11. A coolant filling system, applied to the vehicle cooling system according to claims 1 to 5, characterized in that: include: an automatic temperature controller configured to control the first four-way valve to switch to a state of connecting the engine cooling circuit and the heating system cooling circuit in response to a control instruction of a coolant filling mode; a vehicle controller configured to control the second four-way valve to switch to a state of connecting the motor cooling circuit and the battery cooling circuit in response to a control instruction of a coolant filling mode, and to control the opening of the three-way valve to reach a first preset value; an engine management module, configured to control the opening degree of the thermal management module to reach a maximum value in response to a control instruction of a coolant filling mode; The filling machine is configured to perform a vacuum treatment on the vehicle cooling system, so that the coolant in the expansion water tank is filled into the engine cooling circuit and the heater system cooling circuit, and the coolant is filled into the motor cooling circuit and the battery cooling circuit.

12. A control device, characterized in that: The invention comprises a memory, a processor and a program stored in the memory and executable on the processor, wherein when the program is executed by the processor, the coolant filling control method of the vehicle cooling system as claimed in any one of claims 6 to 10 is implemented.

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