Vehicle cooling system, control method and coolant filling system

Abstract

The application discloses a vehicle cooling system, a control method and a coolant filling system, and belongs to the technical field of vehicles. The engine cooling circuit and the heating system cooling circuit are connected through a first four-way valve in the vehicle cooling system, and the motor cooling circuit and the battery cooling circuit are connected through a second four-way valve. When the vehicle cooling system needs to be filled with coolant, the engine cooling circuit and the heating system cooling circuit are conducted through the first four-way valve, and the motor cooling circuit and the battery cooling circuit are conducted through the second four-way valve. The circuit of the whole vehicle cooling system is more smooth, the coolant in the expansion tank can be filled into the engine cooling circuit and the heating system cooling circuit, and the coolant can be filled into the motor cooling circuit and the battery cooling circuit. The coolant can reach a full filling state, the problem that the coolant is difficult to fill is effectively solved, and the coolant filling time is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a vehicle cooling system, a coolant filling control method and a coolant filling system. BACKGROUND

[0002] With the development of hybrid vehicles, the complexity of the hybrid vehicle thermal management system is constantly improving, especially after the emergence of dual-motor systems and even hybrid four-wheel drive vehicles, the complexity of the cooling system and the length of the cooling system pipeline of the vehicle have increased more than pure electric vehicles or pure fuel vehicles, which has brought difficulties to the cooling liquid filling of the vehicle production line and the cooling liquid filling of after-sales maintenance, and it is easy to appear the dead angle of filling.

[0003] The method of directly filling coolant in the expansion tank and running the engine used in the maintenance of fuel vehicles cannot guarantee that the entire cooling system is filled with coolant, especially after the use of multiple water valves on the vehicle, it is difficult to achieve the state of directly filling the vehicle with coolant. SUMMARY

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

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

[0006] According to the vehicle cooling system of the first aspect of the embodiment of the present application, the expansion tank, the engine cooling circuit, the heating system cooling circuit, the motor cooling circuit and the battery cooling circuit are connected in series through the first four-way valve and the second four-way valve.

[0007] The engine cooling circuit and the heating system cooling circuit are connected in series through the first four-way valve, and the first four-way valve is configured to be able to conduct the engine cooling circuit and the heating system cooling circuit, or disconnect the communication of the engine cooling circuit and the heating system cooling circuit.

[0008] The motor cooling circuit and the battery cooling circuit are connected in series through the second four-way valve, and the second four-way valve is configured to be able to conduct the motor cooling circuit and the battery cooling circuit, or disconnect the communication of the motor cooling circuit and the battery cooling circuit.

[0009] The expansion tank is connected in series with the engine cooling circuit and the motor cooling circuit through the water supplement pipe.

[0010] The engine cooling circuit comprises an engine, an engine water pump, a thermal management module and a first radiator, the water inlet end of the engine water pump is connected with one end of the first radiator, the water outlet end of the engine water pump is connected with the 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 an air pipe in communication with the gas return port of the expansion tank.

[0011] The motor cooling circuit comprises a motor, a motor water pump, a second radiator and a three-way valve, the water inlet end of the motor water pump is connected with one end of the second radiator, the water outlet end of the motor water pump is connected with the water inlet end of the motor, the water inlet end of the three-way valve is connected with the water outlet end of the motor, the first water outlet end of the three-way valve is connected with the other end of the second radiator, and the second water outlet end of the three-way valve is connected with the water inlet end of the motor water pump, and the motor cooling circuit is provided with an air pipe in communication with the gas return port of the expansion tank.

[0012] The vehicle cooling system according to the embodiment of the present application has at least the following beneficial effects:

[0013] The engine cooling circuit and the heating system cooling circuit are connected through the first four-way valve in the vehicle cooling system, the first four-way valve can conduct the engine cooling circuit and the heating system cooling circuit or disconnect the communication of the engine cooling circuit and the heating system cooling circuit, the motor cooling circuit and the battery cooling circuit are connected through the second four-way valve, the second four-way valve can conduct the motor cooling circuit and the battery cooling circuit or disconnect the communication of the motor cooling circuit and the battery cooling circuit, and the expansion tank is connected with the engine cooling circuit and the motor cooling circuit through the water supplement pipe. When the vehicle cooling system needs to be filled with coolant, the engine cooling circuit and the heating system cooling circuit are conducted through the first four-way valve, and the motor cooling circuit and the battery cooling circuit are conducted through the second four-way valve. Since the thermal management module is connected between the water outlet end of the engine and the first radiator in the engine cooling circuit, and the water inlet end of the three-way valve is connected with the water outlet end of the motor, the first water outlet end of the three-way valve is connected with the other end of the second radiator, and the second water outlet end of the three-way valve is connected with the water inlet end of the motor water pump in the motor cooling circuit, the opening of the thermal management module and the three-way valve can be controlled when the coolant is filled, so that the circuit of the entire vehicle cooling system is more smooth, the coolant in the expansion tank can be filled into the engine cooling circuit and the heating system cooling circuit, and the coolant can be filled into the motor cooling circuit and the battery cooling circuit, so that the coolant can reach the filled state, the problem that the coolant is difficult to fill can be effectively solved, and the coolant filling time is reduced.

[0014] According to some embodiments of the present application, the engine cooling circuit further comprises a first bypass branch and a turbocharger, both of the ports of the first four-way valve and the turbocharger are arranged on the first bypass branch, one end of the first bypass branch is connected with the water inlet end of the engine water pump, and the other end is connected with the water outlet end of the thermal management module.

[0015] According to some embodiments of the present application, the heating system cooling circuit comprises a heating water pump, a heater and a heating core, the water inlet end of the heating water pump is connected with one of the ports of the first four-way valve, the water outlet end of the heating water pump is connected with the heater and the heating core in sequence, and the outlet of the heating core is connected with the other port of the first four-way valve.

[0016] According to some embodiments of the present application, two of the ports of the second four-way valve are connected between the motor and the three-way valve, and the other two ports are connected with the battery cooling circuit.

[0017] According to some embodiments of the present application, the battery cooling circuit comprises a power battery, a battery water pump and a refrigerating machine, the battery water pump is connected between the refrigerating machine and the power battery, the water inlet end of the refrigerating machine is connected with one of the ports of the second four-way valve, and the water outlet end of the power battery is connected with the other port of the second four-way valve.

[0018] The cooling liquid filling control method of the vehicle cooling system according to the second aspect of the embodiments of the present application is applied to the vehicle cooling system according to the first aspect of the embodiments of the present application, and the cooling liquid filling control method comprises the following steps.

[0019] In response to the control instruction of the cooling liquid filling mode, the first four-way valve is controlled to switch to a state of conducting the engine cooling circuit and the heating system cooling circuit, the second four-way valve is controlled to switch to a state of conducting the motor cooling circuit and the battery cooling circuit, the opening degree of the thermal management module is controlled to reach a maximum value, and the opening degree of the three-way valve is controlled to reach a first preset value.

[0020] The vehicle cooling system is subjected to vacuumizing treatment, so that the cooling liquid in the expansion water tank is filled into the engine cooling circuit and the heating system cooling circuit, and the cooling liquid is filled into the motor cooling circuit and the battery cooling circuit.

[0021] The cooling liquid filling control method according to the embodiments of the present application has at least the following beneficial effects:

[0022] When the vehicle cooling system needs to be filled with coolant, the following steps are first performed in response to a control instruction of a coolant filling mode: controlling the first four-way valve to switch to a state of conducting the engine cooling circuit and the heating system cooling circuit, controlling the second four-way valve to switch to a state of conducting the motor cooling circuit and the battery cooling circuit, controlling the opening degree of the thermal management module to reach a maximum value, and controlling the opening degree of the three-way valve 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 subjected to a vacuumizing treatment, so that the coolant in the expansion tank is filled into the engine cooling circuit and the heating system cooling circuit, and the coolant is filled into the motor cooling circuit and the battery cooling circuit, thereby realizing filling of the coolant to reach a full-liquid state, effectively solving the problem of difficulty in filling the coolant of the vehicle cooling system, reducing the coolant filling time, and particularly for after-sales maintenance, effectively solving the problem of insufficient coolant filling.

[0023] According to some embodiments of the present application, before the vehicle cooling system is subjected to the vacuumizing treatment, the method further comprises:

[0024] detecting the opening degrees of the first four-way valve, the second four-way valve, the thermal management module and the three-way valve;

[0025] 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, controlling to stop the coolant filling mode and issuing a fault information.

[0026] According to some embodiments of the present application, the coolant filling control method further comprises:

[0027] obtaining state information of the vehicle cooling system;

[0028] when the vehicle cooling system is currently in a normal state, performing the vacuumizing treatment on the vehicle cooling system;

[0029] when the vehicle cooling system is currently in an abnormal state, obtaining component fault information corresponding to the abnormal state, and controlling to exit the coolant filling mode.

[0030] According to some embodiments of the present application, the heating system cooling circuit comprises a heating water pump, a heater and a heating core, a water inlet end of the heating water pump is connected with one of the ports of the first four-way valve, a water outlet end of the heating water pump is connected with the heater and the heating core in sequence, and an outlet of the heating core is connected with the other port of the first four-way valve;

[0031] The coolant filling control method further comprises:

[0032] in response to a control instruction of the fault diagnosis, control the first four-way valve to switch to a state of conducting the engine cooling circuit and the heater system cooling circuit, and control the opening degree of the thermal management module to reach a maximum value;

[0033] after a first preset time, control the duty cycle of the heater water pump to reach a second preset value, control the rotating speed of the engine water pump to reach a preset rotating speed, and determine the state of the first four-way valve, the heater water pump, the thermal management module, and the engine water pump;

[0034] 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 an abnormal state, it is determined that a part fails, and a code of the failed part is sent.

[0035] According to some embodiments of the present application, the battery cooling circuit comprises a power battery, a battery water pump, and a refrigerating machine, the battery water pump is connected between the refrigerating machine and the power battery, the water inlet end of the refrigerating machine is connected with one of the ports of the second four-way valve, and the water outlet end of the power battery is connected with another port of the second four-way valve.

[0036] The cooling liquid filling control method further comprises:

[0037] in response to a control instruction of the fault diagnosis, control the second four-way valve to switch to a state of conducting the motor cooling circuit and the battery cooling circuit, and control the opening degree of the three-way valve to reach the first preset value;

[0038] after a second preset time, control the duty cycle of the motor water pump and the battery water pump to reach a third preset value, and determine the state of the second four-way valve, the three-way valve, the motor water pump, and the battery water pump;

[0039] 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 an abnormal state, it is determined that a part fails, and a code of the failed part is sent.

[0040] The cooling liquid filling system according to the third aspect of the present application comprises:

[0041] an automatic temperature controller configured to, in response to a control instruction of the cooling liquid filling mode, control the first four-way valve to switch to a state of conducting the engine cooling circuit and the heater system cooling circuit;

[0042] a vehicle control unit configured to, in response to a control instruction of the cooling liquid filling mode, control the second four-way valve to switch to a state of conducting the motor cooling circuit and the battery cooling circuit, and control the opening degree of the three-way valve to reach a first preset value.

[0043] 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 the coolant filling mode;

[0044] a filling machine configured to perform a vacuumizing process on the vehicle cooling system, so that the coolant in the expansion tank is filled into the engine cooling circuit and the heating system cooling circuit, and the coolant is filled into the motor cooling circuit and the battery cooling circuit.

[0045] The coolant filling system according to the embodiment of the present application has at least the following beneficial effects:

[0046] In response to the control instruction of the coolant filling mode, the first four-way valve is switched to a state of conducting the engine cooling circuit and the heating system cooling circuit by an automatic temperature controller; the second four-way valve is switched to a state of conducting the motor cooling circuit and the battery cooling circuit by a vehicle controller, and the opening degree of the three-way valve reaches a first preset value; the opening degree of the thermal management module reaches a maximum value by an energy management module; and 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 vacuumized by the filling machine, so that the coolant in the expansion tank is filled into the engine cooling circuit and the heating system cooling circuit, and the coolant is filled into the motor cooling circuit and the battery cooling circuit, thereby realizing the filling of the coolant to reach the full liquid state, effectively solving the problem of difficult filling of the coolant in the vehicle cooling system, reducing the coolant filling time, and effectively solving the problem of insufficient coolant filling for after-sales maintenance.

[0047] The control device according to the fourth aspect of the embodiment of the present application comprises a memory, a processor and a program stored on the memory and executable on the processor, and the program is executed by the processor to realize the coolant filling control method of the vehicle cooling system according to the second aspect of the embodiment.

[0048] Since the control device adopts all the technical solutions of the coolant filling control method according to the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0049] Other features and advantages of the present application will be described in the following description, and some will become apparent from the description, or will be understood by those skilled in the art through implementation of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 is a schematic diagram of an engine cooling circuit and a heating system cooling circuit according to an embodiment of the present application;

[0051] Figure 2 is a schematic diagram of a motor cooling circuit and a battery cooling circuit according to an embodiment of the present application;

[0052] Figure 3 is a flowchart of a coolant filling control method of a vehicle cooling system according to an embodiment of the present application;

[0053] Figure 4 is a flowchart of a fault information determination in a coolant filling control method according to an embodiment of the present application;

[0054] Figure 5 is a schematic diagram of a control system of a coolant filling control method according to an embodiment of the present application;

[0055] Figure 6 is a flowchart of a coolant filling control method of a vehicle cooling system according to an embodiment of the present application;

[0056] Figure 7 is a flowchart of a fault diagnosis in a coolant filling control method according to an embodiment of the present application;

[0057] Figure 8 is a flowchart of a fault diagnosis in a coolant filling control method according to another embodiment of the present application. DETAILED DESCRIPTION

[0058] Embodiments of the present application are described in detail below with reference to the attached drawings, wherein like or similar elements are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below are exemplary only, and are not intended to limit the present application.

[0059] In the description of the present application, it is to be understood that the orientation or positional relationship indicated by terms such as up, down, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0060] In the description of the present application, the meaning of multiple is more than two, greater than, less than, more than, etc. is not included in the number, and above, below, etc. is included in the number. If it is described as first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0061] In the description of the present application, the words such as setting, installation, connection and the like should be understood in a broad sense, and the specific meanings of the above words in the present application can be determined by the person skilled in the art in combination with the specific content of the technical solutions.

[0062] The technical solutions of the present application will be described clearly and completely in combination with the drawings. Obviously, the following described embodiments are part of the embodiments of the present application, not all the embodiments.

[0063] Referring to Figure 1 and Figure 2 , the vehicle cooling system of the embodiment of the present application comprises 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 for cooling the engine of the vehicle, the heating system cooling circuit is used for cooling the heating system of the vehicle, the motor cooling circuit is used for cooling the driving motor of the vehicle, and the battery cooling circuit is used for cooling the power battery of the vehicle, which is suitable for electric vehicles or hybrid electric vehicles.

[0064] Referring to Figure 1 , the engine cooling circuit comprises an engine, an engine water pump, a temperature management module (TMM) and a first radiator, the water inlet end of the engine water pump is connected with the water outlet end of the first radiator, the water outlet end of the engine water pump is connected with the water inlet end of the engine, and the temperature management module is connected between the water outlet end of the engine and the water inlet end of the first radiator. Specifically, the water inlet end of the temperature management module is connected with the water outlet end of the engine, and the water outlet end of the temperature management module is connected with the water inlet end of the first radiator.

[0065] The cooling liquid circulates in the engine cooling circuit, absorbs and carries away the heat generated by the engine, and then dissipates the heat to the air through the first radiator. The engine water pump pressurizes the cooling liquid to ensure its circulation in the circuit. The first radiator is a heat exchanger, which realizes cooling through heat exchange between air and cooling liquid. In some embodiments, the first radiator can be provided with a fan to improve the heat dissipation capacity of the first radiator.

[0066] Referring to Figure 1As shown, the engine cooling circuit further comprises a first bypass branch and a second bypass branch, the first bypass branch comprising a turbocharger (TURBO) and a first four-way valve, and the second bypass branch comprising an engine oil cooler. Specifically, the thermal management module is provided with three water outlet ports, the port 4 of the first four-way valve is connected with the water inlet of the engine water pump, the port 1 of the first four-way valve is connected with the water outlet of the turbocharger, the water inlet of the turbocharger is connected with one of the water outlet ports of the thermal management module, the water inlet of the engine oil cooler is connected with another water outlet port of the thermal management module, the water outlet of the engine oil cooler is connected with the water inlet of the engine water pump, and the last water outlet port of the thermal management module is connected with the first radiator.

[0067] Referring to Figure 1 As shown, the engine cooling circuit further comprises a first bypass branch and a second bypass branch, the first bypass branch comprising a turbocharger (TURBO) and a first four-way valve, and the second bypass branch comprising an engine oil cooler. Specifically, the thermal management module is provided with three water outlet ports, the port 4 of the first four-way valve is connected with the water inlet of the engine water pump, the port 1 of the first four-way valve is connected with the water outlet of the turbocharger, the water inlet of the turbocharger is connected with one of the water outlet ports of the thermal management module, the water inlet of the engine oil cooler is connected with another water outlet port of the thermal management module, the water outlet of the engine oil cooler is connected with the water inlet of the engine water pump, and the last water outlet port of the thermal management module is connected with the first radiator.

[0068] When the port 1 of the first four-way valve is in communication with the port 4, and the port 2 is in communication with the port 3, the first four-way valve is in the first position, the engine cooling circuit is disconnected from the heating system cooling circuit, and the engine cooling circuit and the heating system cooling circuit work independently; when the port 1 of the first four-way valve is in communication with the port 2, and the port 3 is in communication with the port 4, the first four-way valve is in the second position, and the engine cooling circuit and the heating system cooling circuit are in communication.

[0069] In addition, the expansion tank is in communication with the engine cooling circuit through a first water supplement pipe, specifically, the first water supplement 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 cooling liquid filling port connected with the first water supplement pipe. The expansion tank is provided with a gas return port, and the engine cooling circuit and the heating system cooling circuit are respectively provided with a gas pipe in communication with the gas return port of the expansion tank. Figure 1 In the embodiment shown, the engine, the thermal management module, the first radiator and the heating core are respectively provided with a gas pipe, and the pipelines shown by the dashed lines in the figure are the gas pipes. The heating system cooling circuit does not have a separate water supplement pipe, and needs to use the expansion tank to supplement the engine cooling circuit and the heating system cooling circuit with liquid.

[0070] Referring to Figure 1As shown, the engine water pump pumps coolant into the engine, which is divided into three parts by the TMM from the water outlet of the engine. One part enters the first radiator, and after the water outlet of the first radiator, returns to the engine water pump. The second part enters the engine oil cooler, and after the water outlet of the engine oil cooler, returns to the engine water pump. The third part enters the turbocharger, and after the water outlet of the turbocharger, there are two flow directions.

[0071] The first flow direction of the water outlet of the turbocharger is that when the port 1 of the first four-way valve is in communication with the port 4, and the port 2 is in communication with the port 3, the engine cooling circuit and the heating system cooling circuit are disconnected, the engine cooling circuit and the heating system cooling circuit work independently, and the water outlet of the turbocharger directly returns to the engine water pump.

[0072] The second flow direction of the water outlet of the turbocharger is that when the port 1 of the first four-way valve is in communication with the port 2, and the port 3 and the port 4 are in communication, the water outlet of the turbocharger enters the heating system cooling circuit, and after passing through the heating water pump, the heater and the heating core, returns to the engine water pump.

[0073] Among them, the return gas of the first radiator, the return gas of the engine and the return gas of the heating core respectively return to the return gas port of the expansion water tank through the corresponding gas pipes, so as to achieve the purpose of returning gas of the engine cooling circuit and the heating system cooling circuit.

[0074] Referring to 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 end of the motor water pump is connected with the water outlet end of the second radiator, the water outlet end of the motor water pump is connected with the water inlet end of the motor, the water inlet end of the three-way valve is connected with the water outlet end of the motor, the first water outlet end of the three-way valve is connected with the water inlet end of the second radiator, and the second water outlet end of the three-way valve is directly connected with the water inlet end of the motor water pump. The port 1 and the port 4 of the second four-way valve are connected between the water inlet end of the three-way valve and the water outlet end of the motor, and the port 2 and the port 3 of the second four-way valve are used to connect the battery cooling circuit.

[0075] The coolant circulates in the motor cooling circuit, absorbs and carries away the heat generated by the motor, and then is cooled by the second radiator. The motor water pump pressurizes the coolant to ensure its circulation in the circuit. The motor cooling circuit is suitable for electric vehicles or hybrid vehicles with single motor or double motor.

[0076] Taking a double-motor electric vehicle as an example, the motor includes a front drive motor and a rear drive motor, and the motor cooling circuit further includes a front drive inverter, a double-motor oil cooler, a rear drive inverter and a DCDC converter (DC-to-DC Converter), wherein the front drive inverter and the double-motor oil cooler are connected in series to form a first branch circuit, the DCDC converter, the rear drive inverter and the rear drive motor are connected in series to form a second branch circuit, the first branch circuit and the second branch circuit are connected in parallel between the outlet end of the motor water pump and the port 4 of the second four-way valve, and the double-motor motor cooling circuit is formed.

[0077] The DCDC converter is a device for converting direct current power into another direct current power, and is used to adjust the voltage level to meet the power supply requirements of different electronic devices or systems. The motor cooling circuit needs to dissipate heat for the double-motor inverter, the double-motor oil cooler, the rear motor inverter and the rear drive motor.

[0078] In addition, the motor cooling circuit further includes a first water temperature sensor connected to the outlet end of the motor water pump for detecting the temperature of the coolant in the circuit, and the working state of the second four-way valve and the three-way valve can be controlled according to the temperature of the coolant.

[0079] Referring to Figure 2 As shown in the figure, the battery cooling circuit includes a power battery, a battery water pump and a refrigerating machine, the inlet end of the refrigerating machine is connected to the port 3 of the second four-way valve, the outlet end of the refrigerating machine is connected to the inlet end of the battery water pump, the outlet end of the battery water pump is connected to the inlet end of the power battery, and the outlet end of the power battery is connected to the port 2 of the second four-way valve, thereby forming the battery cooling circuit. Under the drive of the battery water pump, the coolant circulates in the battery cooling circuit, absorbs and carries away the heat generated by the power battery, and the refrigerating machine exchanges heat with the coolant to achieve the effect of heat dissipation.

[0080] In addition, the battery cooling circuit further includes a second water temperature sensor connected to the outlet end of the battery water pump for detecting the temperature of the coolant in the circuit, and the working state of the second four-way valve and the three-way valve can be controlled according to the temperature of the coolant in the motor cooling circuit and the battery cooling circuit by using the first water temperature sensor and the second water temperature sensor.

[0081] It can be understood that the expansion tank is connected to the inlet end of the motor water pump through the second water supplement pipe, the motor cooling circuit is provided with a filling port connected with the second water supplement pipe, and the battery cooling circuit does not need to be separately provided with a water supplement pipe, and the expansion tank can supplement the liquid to the motor cooling circuit and the battery cooling circuit.

[0082] The coolant of the motor cooling circuit runs 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 double motor oil cooler. In the second branch, the coolant enters the DCDC converter, the rear motor inverter and the rear drive motor. The outlet water of the two branches is mixed and passes through the second four-way valve. When the port 1 and the port 4 of the second four-way valve are conductive, and the port 2 and the port 3 are conductive, the second four-way valve is in the first position, the motor cooling circuit and the battery cooling circuit are in an independent state, the outlet water of the two drive motors flows through the second four-way valve and enters the three-way valve, the coolant directly returns to the motor water pump through the third branch, or returns to the motor water pump through the second radiator. Whether the coolant passes through the second radiator is determined by the opening degree of the three-way valve. When the opening degree of the three-way valve is 50%, half of the coolant flows through the second radiator, and the other half of the coolant directly flows to the motor water pump without passing through the second radiator. When the port 1 and the port 2 of the second four-way valve are conductive, and the port 3 and the port 4 are conductive, the second four-way valve is in the second position, and the motor cooling circuit and the battery cooling circuit are conductive.

[0083] Reference Figures 3 to 8 The coolant filling control method according to the embodiment of the present application is described below with reference to the vehicle cooling system of the above embodiment as an example.

[0084] Reference Figure 3 The coolant filling control method of the embodiment of the present application includes but is not limited to the following steps:

[0085] In step S100, in response to the control instruction of the coolant filling mode, the first four-way valve is switched to a state of conducting the engine cooling circuit and the heating system cooling circuit, the second four-way valve is switched to a state of conducting the motor cooling circuit and the battery cooling circuit, the opening degree of the thermal management module reaches the maximum value, and the opening degree of the three-way valve reaches a first preset value.

[0086] In step S200, the vehicle cooling system is subjected to vacuumizing treatment, so that the coolant in the expansion tank is filled into the engine cooling circuit and the heating system cooling circuit, and the coolant in the expansion tank is filled into the motor cooling circuit and the battery cooling circuit.

[0087] In combination Figure 1 It can be understood that, since the engine cooling circuit and the heating system cooling circuit are connected through the first four-way valve, the expansion tank is connected to the engine cooling circuit, and the heating system cooling circuit does not have a separate expansion tank for water replenishment, it is necessary to replenish the coolant in the expansion tank to the engine cooling circuit and the heating system cooling circuit.

[0088] Based on this, when it is necessary to add coolant, a control instruction of a coolant adding mode is sent to a vehicle controller of the vehicle, and the vehicle controller controls the first four-way valve, the second four-way valve, the thermal management module and the three-way valve to perform corresponding operations after responding to the control instruction, so that the engine cooling circuit and the heating system cooling circuit are connected, the motor cooling circuit and the battery cooling circuit are connected, the opening degree of the thermal management module reaches the maximum value, and the opening degree of the three-way valve reaches a first preset value. The opening degree of the thermal management module reaching the maximum value means that the opening degree is 100%, and the first preset value can be set to 40%, 50%, 60%, etc.

[0089] After the first four-way valve, the second four-way valve, the thermal management module and the three-way valve reach the above-mentioned adding conditions, step S200 is performed, and the vehicle cooling system is subjected to vacuumizing treatment by using an adding machine, so that the coolant in the expansion tank can be added to the engine cooling circuit and the heating system cooling circuit, and the coolant in the expansion tank can be added to the motor cooling circuit and the battery cooling circuit. Since the opening degree of the thermal management module reaches 100% and the opening degree of the three-way valve is large enough, the coolant can flow in the corresponding circuits, the circulation efficiency is improved, the coolant can be added to reach the full liquid state, the problem that the coolant of the vehicle cooling system is difficult to add is effectively solved, and the coolant adding time is effectively reduced. In particular, for after-sales maintenance, the problem of insufficient coolant addition can be effectively solved.

[0090] Referring to Figure 4 Before the vehicle cooling system is subjected to vacuumizing treatment, the following steps are further included:

[0091] Step S110, detecting the opening degrees of the first four-way valve, the second four-way valve, the thermal management module and the three-way valve;

[0092] Step S120, 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 the preset opening degree, the coolant adding mode is controlled to be discontinued, and a fault information is issued.

[0093] It should be noted that the opening degree of the TMM is controlled by the water temperature of the engine cooling circuit. When the water temperature is greater than 95℃, the opening degree of the TMM is 100%. When the opening degree of the TMM is 100%, the first radiator can be filled with coolant.

[0094] The conducting position of the first four-way valve is determined by the running state of the vehicle, whether the driver turns on the heating, and the engine water temperature. When the vehicle is running, the driver turns on the air conditioning heating, and the engine water temperature is > 80℃, the first four-way valve switches to the state of conducting the engine cooling circuit and the heating system cooling circuit, i.e. the second position. In other cases, the first four-way valve is in the state of cutting off the engine cooling circuit and the heating system cooling circuit, i.e. the first position. After the vehicle is parked and turned off, the state of the first four-way valve remains unchanged before the power is turned off. Only when the first four-way valve is in the second position, the cooling liquid can be filled to ensure that the cooling liquid in the heating system cooling circuit is filled sufficiently.

[0095] The conducting 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 > the maximum temperature of the battery core, and the water temperature of the motor cooling circuit is < 35℃, the second four-way valve is in the second position; or 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, and 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 before the power is turned off.

[0096] The opening degree of the three-way valve is determined by the temperature of the motor cooling circuit. When 38℃≤ the water temperature of the motor cooling circuit ≤43℃, the opening degree of the three-way valve is 50%, when the water temperature of the motor cooling circuit is > 45℃, the opening degree of the three-way valve is 100%, and when the water temperature of the motor cooling circuit is ≤35℃, the opening degree of the three-way valve is 0%. After the vehicle is parked and turned off, the opening degree of the three-way valve remains unchanged before the power is turned off. When the first four-way valve is in the second position, the second four-way valve is in the second position, and the opening degree of the three-way valve reaches 50%, the cooling liquid is filled, which can ensure that the cooling liquid of the entire vehicle cooling system is full.

[0097] Before filling the cooling liquid, it is necessary to detect the opening degree of the first four-way valve, the second four-way valve, the thermal management module, and the three-way valve to determine whether the above-mentioned filling conditions are met. Among them, the opening degree of the first four-way valve and the second four-way valve represents the opening degree in the conducting position, for example, when the opening degree of the first four-way valve is 100%, it means that the engine cooling circuit and the heating system cooling circuit are completely conducted, and when the opening degree of the second four-way valve is 100%, it means that the motor cooling circuit and the battery cooling circuit are completely conducted.

[0098] The first four-way valve, the second four-way valve, and the thermal management module do not reach the preset opening degree, which means that the opening degree of the first four-way valve, the second four-way valve, and the thermal management module does not reach 100%, and the opening degree of the three-way valve does not reach the preset opening degree, which means that the opening degree of the three-way valve does not reach 50%. 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 the preset opening degree, it means that there is a risk of insufficient coolant filling due to insufficient opening degree, so the control of the coolant filling mode is stopped, the above step S200 is not performed, and a fault information is issued, for example, an information of stopping the coolant filling mode is issued to the driver through the vehicle system, or a fault information of a component is issued.

[0099] The coolant filling control method in the embodiment further includes the following steps:

[0100] Obtaining state information of the vehicle cooling system; when the vehicle cooling system is currently in a normal state, performing a vacuumizing process on the vehicle cooling system; when the vehicle cooling system is currently in an abnormal state, obtaining component fault information corresponding to the abnormal state, and controlling to exit the coolant filling mode.

[0101] It can be understood that before the filling machine performs the vacuumizing, the working state of the vehicle cooling system needs to be understood, therefore, in the embodiment, the state information of the vehicle cooling system needs to be obtained, for example, by communicating with the vehicle controller, parameter information of each valve, pump, water temperature, etc. in the vehicle cooling system is obtained.

[0102] If each parameter information of the vehicle cooling system is within the normal range, it means that the vehicle cooling system is currently in a normal state, and the filling machine performs the coolant filling according to the set program of vacuumizing-pressurizing-filling-suction process; if each parameter information of the vehicle cooling system is not within the normal range, it means that the vehicle cooling system is currently in an abnormal state, the component fault 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.

[0103] Reference Figure 5As shown, in the embodiment of the present application, the TMM, the first four-way valve, the second four-way valve, the three-way valve and the water pumps are respectively controlled by the automatic temperature controller (ATC), the engine management system (EMS) and the vehicle control unit (VCU) to perform the above-mentioned coolant filling process. Specifically, 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.

[0104] The following will be specifically described by taking the process of vacuum filling of coolant on the production line as an example.

[0105] Referring to Figure 6 As shown, when the vehicle is vacuum filled on the production line, the vehicle needs to be in the IG ON mode, the filling machine signal line is connected with the vehicle diagnostic interface, and the filling gun head is installed to the expansion tank. After the operator presses the start button, the filling machine communicates with the vehicle and starts vacuumizing. After the vehicle receives the diagnostic protocol agreed with the filling machine, the vehicle sends a 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 degree of the three-way valve to reach 50%, and sends a signal of Vacuum FillCoolant = 1 to the EMS and the ATC. After receiving the signal, the EMS and the ATC control the opening degree of the TMM to reach 100% and control the first four-way valve to switch to the second position. At the same time, after the opening degrees of the first four-way valve and the TMM meet the requirements, the ATC and the EMS need to feed back Vacuum FillCoolantSt = 1, i.e. normal signals to the VCU in the vacuum filling mode, and the opening degrees of the second four-way valve and the three-way valve are judged by the VCU. The VCU sends the Vacuum FillCoolant = 1 signal for 25s and judges the state of each part. If the opening degree of any part does not meet the requirements, the VCU sends a signal of Vacuum FillCoolantSt = 2, i.e. the vacuum filling mode cannot enter and feeds back the code of the faulty part to the VCU.

[0106] After the filling command is sent, the filling machine needs to confirm whether the vehicle enters the vacuum filling state. After the filling machine sends the filling command for 30s, it needs to send the agreed command again to inquire whether the vehicle enters the vacuum filling state. If the vehicle state is normal, the vehicle sends positive feedback to the filling machine; if the parts of the vehicle are abnormal, the vehicle sends negative feedback to the filling machine.

[0107] After receiving positive feedback, the filling machine carries out the vacuum-preservation-filling-suction process according to the set program to cool the liquid filling, and 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. VCU, ATC and EMS control the corresponding valve body to return to the initial position, and the vehicle enters the next process.

[0108] After receiving negative feedback, the filling machine needs to ask again about the fault state of the parts according to the agreed service, and the VCU feeds back the fault of the second four-way valve, three-way valve, EMS or ATC to the filling machine. The filling machine alarms and controls the VCU to exit the filling mode through the command. The name of the faulty component is displayed on the filling machine display screen, which is convenient for the operator to maintain.

[0109] In some embodiments, when the whole vehicle is powered off, each controller controls each valve body to return to the state of connecting the circuit. The vehicle in this state can directly perform vacuum filling without communication with the filling machine when performing vacuum filling on the production line.

[0110] Referring to Figure 7 The cooling liquid filling control method in the embodiment further includes the following steps:

[0111] Step S300, in response to the control instruction of fault diagnosis, control the first four-way valve to switch to the state of conducting the engine cooling circuit and the heating system cooling circuit, and control the opening degree of the thermal management module to reach the maximum value;

[0112] Step S400, after the first preset time, control the duty cycle of the heating water pump to reach the second preset value, and control the rotating speed of the engine water pump to reach the preset rotating speed, and judge the state of the first four-way valve, the heating water pump, the thermal management module and the engine water pump;

[0113] Step S500, when the state of any one 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 a fault occurs in the part, and the code of the faulty part is sent.

[0114] It can be understood that when the cooling liquid of the vehicle cooling system leaks, the cooling effect of the vehicle cooling system is reduced, and the vehicle cooling system needs to be detected and repaired. In the specific operation, the engine cooling circuit and the heating system cooling circuit are detected. First, the first four-way valve needs to be controlled to switch to the state of conducting the engine cooling circuit and the heating system cooling circuit, and the opening of the thermal management module reaches the maximum value. Then control the duty cycle of the heating water pump to reach the second preset value, and control the speed of the engine water pump to reach the preset speed, obtain the running information of the first four-way valve, the heating water pump, the thermal management module and the engine water pump, and judge the working state of the first four-way valve, the heating water pump, the thermal management module and the engine water pump according to the running information. When any one 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 as to facilitate the maintenance personnel to determine the faulty part in the engine cooling circuit and the heating system cooling circuit.

[0115] Referring to Figure 8 The cooling liquid filling control method in the embodiment further includes the following steps:

[0116] Step S600, in response to the control instruction of fault diagnosis, the second four-way valve is controlled to switch to the state of conducting the motor cooling circuit and the battery cooling circuit, and the opening of the three-way valve reaches the first preset value;

[0117] Step S700, after the second preset time, the duty cycle of the motor water pump and the battery water pump reaches the third preset value, and the state of the second four-way valve, the three-way valve, the motor water pump and the battery water pump is judged;

[0118] Step S800, when any one of the second four-way valve, the three-way valve, the motor water pump and the battery water pump is in an abnormal state, it is determined that the part is faulty, and the code of the faulty part is sent.

[0119] It can be understood that when the motor cooling circuit and the battery cooling circuit need to be detected and repaired, the second four-way valve needs to be controlled to switch to the state of conducting the motor cooling circuit and the battery cooling circuit, and the opening of the three-way valve reaches 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 running 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 running information. When 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 corresponding faulty part is sent to the detection equipment, so as to facilitate the maintenance personnel to determine the faulty part in the motor cooling circuit and the battery cooling circuit.

[0120] The following will be described in detail with the process of filling coolant in vehicle after-sales maintenance as an example.

[0121] When the vehicle failure leads to the lack of coolant, the diagnostic instrument needs to be used to enter the maintenance filling mode to fill the coolant. After the diagnostic instrument is connected with the vehicle, the vehicle enters the preparation state. The operator clicks the enter maintenance filling mode button on the diagnostic instrument. At this time, the diagnostic instrument sends instructions to the VCU through the agreed protocol. After the VCU receives the maintenance filling signal, it sends the signal Service FillCoolant=1 to the EMS and ATC. After the ATC receives the signal Service FillCoolant=1, the first four-way valve is controlled to switch to the second position. After the EMS receives the signal Service FillCoolant=1, the opening of the TMM reaches 100%. At the same time, the VCU controls the second four-way valve to switch to the second position, and the opening of the three-way valve reaches 50%.

[0122] After the EMS controls the opening of the TMM to reach 100% and delays for 2 minutes, the engine electric water pump is controlled to 3000 rpm. After the first four-way valve switches to the second position and delays for 2 minutes, the duty cycle of the heater water pump reaches 85%. After the VCU controls the second four-way valve to switch to the second position and delays for 2 minutes, the duty cycle of the motor water pump and the battery water pump reaches 85%.

[0123] After receiving the signal Service FillCoolant=1 and delaying for 2.5 minutes, the EMS judges the state of the TMM and the engine water pump. If the TMM and the engine water pump have reached the target opening, it feeds back to the VCU that it has entered the filling mode (Service FillCoolantst=1). If the opening of any one of the TMM and the engine water pump does not reach the target opening, it feeds back that it cannot enter the maintenance filling mode (Service FillCoolantst=2) and feeds back the fault part code (such as TMM fault, engine water pump fault, etc.).

[0124] After receiving the signal Service FillCoolant=1 and delaying for 2.5 minutes, the ATC judges the state 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 feeds back to the VCU that it has entered the filling mode (Service FillCoolantst=1). If the opening of any one of the first four-way valve and the heater water pump does not reach the target opening, it feeds back that it cannot enter the maintenance filling mode (Service FillCoolantst=2) and feeds back the fault part code (such as first four-way valve fault, heater water pump fault, etc.).

[0125] The diagnostic instrument sends a command after 2.5 minutes, and it is necessary to confirm whether the whole vehicle enters the maintenance and filling state. The command is sent to the VCU through the agreed diagnostic service. After receiving the diagnostic signal, the VCU judges the state of the water valve and water pump controlled by the VCU and the state of the feedback of the EMS and ATC. If the water pump and the water pump are both in the correct opening position, the VCU sends a positive feedback to the diagnostic instrument, and the diagnostic instrument displays OK. If the state of the water pump, the water pump, or the feedback of the EMS and ATC is incorrect, the whole vehicle sends a negative feedback to the diagnostic instrument, and the diagnostic instrument displays NO OK. If the diagnostic instrument inquires whether the VCU enters the filling mode within 2.5 minutes after sending the command signal, the VCU feedbacks NO OK and no fault state; if the time is greater than or equal to 2.5 minutes, the VCU feedbacks NO OK and fault state or OK no fault.

[0126] After the operator sees the OK command feedback of the diagnostic instrument, he needs to pay attention to the liquid level of the expansion water tank. If the liquid level drops, the cooling liquid needs to be added. After receiving the NO OK command, the operator needs to click the diagnostic instrument again to 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, and the diagnostic instrument displays the fault part code and sends a command to control the whole vehicle to exit the maintenance and filling mode.

[0127] After entering the maintenance and filling mode, the operator fills the cooling liquid to the middle of the MAX line and the MIN line until the cooling liquid level is stable for 10 minutes and does not drop any more, indicating that the cooling liquid filling is completed.

[0128] 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 (if there is no demand, return to the default mode), and sends the exit filling mode signal (Service FillCoolant=0) to the EMS and ATC. The EMS and ATC control the water valve and water pump according to the demand of the vehicle (if there is no demand, return to the default mode).

[0129] It should be noted that in some embodiments, the diagnostic instrument or the filling machine directly controls the opening of the water valve and water pump on the vehicle through the diagnostic command. If the water valve and water pump on the vehicle are located under different controllers, the diagnostic instrument needs to communicate with different controllers, and not the way of CAN signal communication between the controllers mentioned in the embodiments. The diagnostic instrument only communicates with the VCU of the vehicle. The way that the diagnostic instrument or the filling machine communicates with different controllers of the vehicle to control the controlled parts under the different controllers is consistent with the method of the diagnostic instrument communicating with the VCU to control the second four-way valve and the motor water pump.

[0130] The embodiment of the present application also provides a cooling liquid filling system applied to the vehicle cooling system of the above embodiment and capable of executing the cooling liquid filling control method of the vehicle cooling system provided by the above embodiment, and specifically, the cooling liquid filling system comprises a vehicle controller, an automatic temperature controller, an engine management module and a filling machine.

[0131] The automatic temperature controller is configured to control the first four-way valve to switch to a state of conducting the engine cooling circuit and the heating system cooling circuit in response to the control instruction of the cooling liquid filling mode.

[0132] The vehicle controller is configured to control the second four-way valve to switch to a state of conducting the motor cooling circuit and the battery cooling circuit and control the opening degree of the three-way valve to reach a first preset value in response to the control instruction of the cooling liquid filling mode.

[0133] The engine management module is configured to control the opening degree of the thermal management module to reach a maximum value in response to the control instruction of the cooling liquid filling mode.

[0134] The filling machine is configured to perform vacuumizing treatment on the vehicle cooling system, so that the cooling liquid in the expansion tank is filled into the engine cooling circuit and the heating system cooling circuit and the cooling liquid is filled into the motor cooling circuit and the battery cooling circuit.

[0135] It should be noted that the cooling liquid filling system can also perform steps S300, S400, S500, S600, S700 and S800 in the cooling liquid filling control method of the above embodiment.

[0136] In response to the control instruction of the cooling liquid filling mode, the first four-way valve is controlled by the automatic temperature controller to switch to a state of conducting the engine cooling circuit and the heating system cooling circuit, the second four-way valve is controlled by the vehicle controller to switch to a state of conducting the motor cooling circuit and the battery cooling circuit, the opening degree of the three-way valve is controlled by the vehicle controller to reach a first preset value, the opening degree of the thermal management module is controlled by the energy management module to reach a maximum value, and the filling machine performs vacuumizing treatment on the vehicle cooling system after the first four-way valve, the second four-way valve, the thermal management module and the three-way valve meet the requirements, so that the cooling liquid in the expansion tank is filled into the engine cooling circuit and the heating system cooling circuit and the cooling liquid is filled into the motor cooling circuit and the battery cooling circuit, thereby realizing filling of the cooling liquid to a full liquid state, effectively solving the problem of difficulty in filling of the cooling liquid of the vehicle cooling system, reducing the cooling liquid filling time, and particularly for after-sales maintenance, effectively solving the problem of insufficient filling of the cooling liquid.

[0137] The embodiment of the present application also provides a control device, comprising a memory, a processor and a program stored in the memory and executable on the processor, and the program is executed by the processor to realize the coolant filling control method of the vehicle cooling system as described in the above embodiment.

[0138] It should be noted that the vehicle of the embodiment of the present application has a processor and a memory, and the memory is used to store instructions, and when the instructions are executed by the processor, the coolant filling control method of the vehicle cooling system of the above embodiment is executed.

[0139] Taking the processor and the memory in the control device as an example, the processor and the memory 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 can include a high-speed random access memory, and can also include a non-transitory memory, such as at least one disk memory, a flash memory device, or other non-transitory solid state memory device. In some embodiments, the memory can optionally include a memory remotely arranged relative to the control processor, and these remote memories can be connected to the controller through a network.

[0140] The non-transitory software programs 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 in the above embodiment is executed, for example, the method steps S100 to S200 in the above description Figure 3 , the method steps S110 to S120 in the above description Figure 4 , the method steps S300 to S500 in the above description Figure 7 , the method steps S600 to S800 in the above description Figure 8 , etc.

[0141] The device embodiments described above are only schematic, and the units described as separate components can or can not be physically separated, that is, they can be located in one place, or can be distributed to multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment of the present application.

[0142] The vehicle cooling system, the control method and the control device of the embodiment of the present application are suitable for hybrid vehicles, and the vehicle can be a private car, such as a sedan, an SUV, an MPV or a pickup truck, etc. The vehicle can also be an operating vehicle, such as a van, a bus, a small truck or a large trailer, etc.

[0143] The embodiment of the present application also provides a computer readable storage medium, and the computer readable storage medium stores a computer program, the computer program includes program instructions, and a processor executes the program instructions to realize any one of the coolant filling control methods of the vehicle cooling system provided by the embodiments of the present application.

[0144] The computer readable storage medium can be a hard disk or a memory of the domain controller of the foregoing embodiments. The computer readable storage medium can also be an external storage device of the domain controller, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, and the like.

[0145] The computer program stored in the computer readable storage medium can execute any of the cooling liquid filling control methods provided by the embodiments of the present application, thus achieving the beneficial effects of any of the cooling liquid filling control methods provided by the embodiments of the present application. Details are described in the foregoing embodiments, which will not be repeated here.

[0146] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the foregoing embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

Claims

1. A coolant filling system, characterized by, The vehicle cooling system, the automatic temperature controller, the vehicle controller, the engine management module and the filling machine are included. The vehicle cooling system includes 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 and the heating system cooling circuit are connected through a first four-way valve, and the first four-way valve is configured to be able to conduct the engine cooling circuit and the heating system cooling circuit, or disconnect the communication of the engine cooling circuit and the heating system cooling circuit. The motor cooling circuit and the battery cooling circuit are connected through a second four-way valve, and the second four-way valve is configured to be able to conduct the motor cooling circuit and the battery cooling circuit, or disconnect the communication of the motor cooling circuit and the battery cooling circuit. The expansion tank is connected with the engine cooling circuit and the motor cooling circuit through a water supplement pipe respectively. The engine cooling circuit includes an engine, an engine water pump, a thermal management module and a first radiator, the water inlet end of the engine water pump is connected with one end of the first radiator, the water outlet end of the engine water pump is connected with the 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 a gas pipe connected with a gas return port of the expansion tank. The motor cooling circuit includes a motor, a motor water pump, a second radiator and a three-way valve, the water inlet end of the motor water pump is connected with one end of the second radiator, the water outlet end of the motor water pump is connected with the water inlet end of the motor, the water inlet end of the three-way valve is connected with the water outlet end of the motor, the first water outlet end of the three-way valve is connected with the other end of the second radiator, the second water outlet end of the three-way valve is connected with the water inlet end of the motor water pump, and the motor cooling circuit is provided with a gas pipe connected with a gas return port of the expansion tank. The automatic temperature controller is configured to control the first four-way valve to switch to the state of conducting the engine cooling circuit and the heating system cooling circuit in response to the control instruction of the cooling liquid filling mode. The vehicle controller is configured 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 degree of the three-way valve to reach a first preset value in response to the control instruction of the cooling liquid filling mode. The engine management module is configured to control the opening degree of the thermal management module to reach a maximum value in response to the control instruction of the cooling liquid filling mode. The filling machine is configured to perform vacuumizing treatment on the vehicle cooling system, so that the cooling liquid in the expansion tank is filled into the engine cooling circuit and the heating system cooling circuit, and the cooling liquid is filled into the motor cooling circuit and the battery cooling circuit.

2. The coolant filling system of claim 1, wherein The engine cooling circuit further comprises a first bypass branch and a turbocharger, both of which are arranged on the first bypass branch, one end of the first bypass branch is connected with the water inlet end of the engine water pump, and the other end is connected with the water outlet end of the thermal management module.

3. The coolant filling system of claim 1, wherein The heating system cooling circuit comprises a heating water pump, a heater and a heating core, the water inlet end of the heating water pump is connected with one of the ports of the first four-way valve, the water outlet end of the heating water pump is connected with the heater and the heating core in sequence, and the outlet of the heating core is connected with the other port of the first four-way valve.

4. The coolant filling system of claim 1, wherein Two of the ports of the second four-way valve are connected between the motor and the three-way valve, and the other two ports are connected with the battery cooling circuit.

5. The coolant filling system of claim 1, wherein The battery cooling circuit comprises a power battery, a battery water pump and a refrigerating machine, the battery water pump is connected between the refrigerating machine and the power battery, the water inlet end of the refrigerating machine is connected with one of the ports of the second four-way valve, and the water outlet end of the power battery is connected with the other port of the second four-way valve.

6. A coolant filling control method of a coolant filling system, applied to the coolant filling system according to any one of claims 1 to 5, characterized by, The cooling liquid filling control method comprises: in response to the control instruction of the cooling liquid filling mode, controlling the first four-way valve to switch to the state of conducting the engine cooling circuit and the heating system cooling circuit, controlling the second four-way valve to switch to the state of conducting the motor cooling circuit and the battery cooling circuit, controlling the opening of the thermal management module to reach the maximum value, and controlling the opening of the three-way valve to reach the first preset value; performing vacuumizing treatment on the vehicle cooling system, so that the cooling liquid in the expansion tank is filled into the engine cooling circuit and the heating system cooling circuit, and the cooling liquid is filled into the motor cooling circuit and the battery cooling circuit.

7. The coolant filling control method of the coolant filling system according to claim 6, characterized by, Before the vacuumizing treatment on the vehicle cooling system, the method further comprises: detecting the opening of the first four-way valve, the second four-way valve, the thermal management module and the three-way valve; 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, controlling to stop the cooling liquid filling mode and issuing a fault information.

8. The coolant filling control method of the coolant filling system according to claim 6, characterized by, The cooling liquid filling control method further comprises: obtaining the state information of the vehicle cooling system; when the vehicle cooling system is currently in a normal state, performing the vacuumizing treatment on the vehicle cooling system; when the vehicle cooling system is currently in an abnormal state, obtaining the component fault information corresponding to the abnormal state, and controlling to exit the cooling liquid filling mode.

9. The coolant filling control method of the coolant filling system according to claim 6, characterized by, The heating system cooling circuit comprises a heating water pump, a heater and a heating core, the water inlet end of the heating water pump is connected with one of the ports of the first four-way valve, the water outlet end of the heating water pump is connected with the heater and the heating core in sequence, and the outlet of the heating core is connected with the other port of the first four-way valve. The cooling liquid filling control method further comprises: In response to the control instruction of the fault diagnosis, the first four-way valve is controlled to switch to a state of conducting the engine cooling circuit and the heater 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, the rotating speed of the engine water pump is controlled to reach a preset rotating 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 an abnormal state, it is determined that a part is faulty, and a code of the faulty part is sent.

10. The coolant filling control method of the coolant filling system according to claim 6, characterized by, The battery cooling circuit comprises a power battery, a battery water pump and a refrigerating machine, the battery water pump is connected between the refrigerating machine and the power battery, the water inlet end of the refrigerating machine is connected with one port of the second four-way valve, and the water outlet end of the power battery is connected with another port of the second four-way valve; The cooling liquid filling control method further comprises: In response to the control instruction of the fault diagnosis, the second four-way valve is controlled to switch to a state of conducting the motor cooling circuit and the battery cooling circuit, and the opening degree of the three-way valve is controlled to reach the first preset value; After a second preset time, the duty cycles of the motor water pump and the battery water pump are 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 an abnormal state, it is determined that a part is faulty, and a code of the faulty part is sent.

11. A control device characterized by comprising: The program is executed by the processor to implement the cooling liquid filling control method of the cooling liquid filling system according to any one of claims 6 to 10.

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