A thermal management system, excavator and control method thereof

Abstract

The application discloses a heat management system, an excavator and a control method thereof. The heat management system is formed with a cooling flow path, and the cooling flow path comprises a first main path, a first cooling branch path, a second cooling branch path and a short-circuit branch path. The heat management system comprises a radiator, a diesel engine, an electric device to be cooled and a switching device. The radiator is arranged on the first main path. The diesel engine is arranged on the first cooling branch path. The electric device to be cooled is arranged on the second cooling branch path. The switching device is used to switch the communication between the two ends of the first main path and the two ends of the first cooling branch path or the two ends of the second cooling branch path, or to switch the communication between the two ends of the short-circuit branch path and the two ends of the second cooling branch path and form a self-circulation flow path, so that the heat management system has multiple cooling modes. Therefore, a set of water cooling systems can be used regardless of traditional diesel power or pure electric power.

Description

Technical Field

[0001] This invention relates to the field of thermal management technology, and in particular to a thermal management system, an excavator, and a control method thereof. Background Technology

[0002] Compared to traditional excavators, dual-power excavators possess both a traditional diesel engine power output system and a pure electric power output system. When no convenient power source is available, the traditional diesel engine provides power; when a suitable industrial power supply is available, the electric motor is connected via cable and electronic control system to provide power. Because they have two independent power output systems, and one system requires high-temperature cooling (the thermal equilibrium temperature of a diesel engine system is generally above 95℃) while the other requires medium-temperature cooling (the thermal equilibrium temperature of the electric motor and electronic control system is generally below 65℃), the traditional solution is to equip them with two separate cooling systems. This has the following five significant drawbacks: 1. Insufficient space for cooling system layout; 2. High cost of cooling systems; 3. Low utilization rate of cooling systems; 4. High material requirements and high failure rate in cooling systems; 5. Complicated assembly and maintenance of cooling systems.

[0003] Therefore, an integrated cooling system solution is needed to ensure the cooling needs of both power output systems simultaneously with a single cooling system, significantly reducing the cost of the cooling system while solving the problem of insufficient space for overall machine layout and a series of related issues. Summary of the Invention

[0004] The main objective of this invention is to propose a thermal management system, an excavator, and a control method thereof, aiming to provide a water-cooling system that can be used regardless of whether it is powered by traditional diesel or pure electric power.

[0005] To achieve the above objectives, the thermal management system proposed in this invention includes:

[0006] A cooling flow path is formed on the thermal management system, the cooling flow path including a first main path, a first cooling branch path, a second cooling branch path, and a short-circuit branch path;

[0007] The thermal management system includes:

[0008] The radiator is located on the first main road;

[0009] The diesel engine is located on the first cooling branch.

[0010] The electrical components to be cooled are located on the second cooling branch; and,

[0011] A switching device is used to switch the two ends of the first main road to be connected to the two ends of the first cooling branch or the two ends of the second cooling branch, or to switch the two ends of the short-circuit branch to be connected to the two ends of the second cooling branch to form a self-circulating flow path, so that the thermal management system has multiple cooling modes.

[0012] Optionally, the switching device includes:

[0013] A first switching device is used to switch the connection between the two ends of the first main road and the two ends of the first cooling branch or the two ends of the second cooling branch; and,

[0014] The second switching device is used to switch the two ends of the short-circuit branch to connect with the two ends of the second cooling branch to form a self-circulating flow path.

[0015] This configuration allows the cooling system to open or close its self-circulating flow path simply by operating the second switching device.

[0016] Optionally, the first switching device includes a three-position four-way valve, which has a P main water inlet, a T main water inlet, an A main water inlet, and a B main water inlet, wherein the P main water inlet is connected to the first main line, the T main water inlet is connected to the short-circuit branch, the A main water inlet is connected to the first cooling branch, and the B main water inlet is connected to the second cooling branch.

[0017] The second switching device includes two three-way valves, each of which has three connecting ports. In one of the three-way valves, two of the connecting ports are respectively connected to one end of the second cooling branch, and the remaining connecting port is connected to one end of the short-circuit branch. In the other three-way valve, two of the connecting ports are respectively connected to the other end of the second cooling branch, and the remaining connecting port is connected to the other end of the short-circuit branch.

[0018] With this configuration, the three-position four-way valve can connect one valve component to the first main line, the short-circuit branch, the first cooling branch, and the second cooling branch. The three-way valve is readily available, easy to purchase, and easy to install, and has a low cost. By setting up the two three-way valves, the two ends of the short-circuit branch can be switched to connect with the two ends of the second cooling branch to form a self-circulating flow path.

[0019] Optionally, the electrical component to be cooled includes at least one of a motor and an electrical control box; thus, the electrical control box is a functional component used to control, measure, signal, protect, and regulate the motor, and is configured to be cooled in the first cooling circuit. It should be noted that at least one component to be cooled is included in the cooling cycle. And / or,

[0020] Multiple electrical components to be cooled are provided and connected in series on the second cooling branch.

[0021] This design allows for the cooling of more functional components.

[0022] Optionally, a booster pump is also provided on the second cooling branch.

[0023] This configuration allows for faster and higher water flow in the second cooling circuit.

[0024] Optionally, the radiator is also connected to an expansion tank;

[0025] Thus, an expansion tank is provided at the top of the radiator, where steam condenses into water, which can then enter the inner tank of the expansion tank through a water pipe, maintaining a high water pressure at the inlet of the booster pump, thereby increasing the pump water volume at the second cooling branch.

[0026] And / or,

[0027] The thermal management system also includes a fan for cooling the radiator.

[0028] This configuration allows the radiator to cool down quickly.

[0029] Optionally, a first temperature sensor is provided on the first main road; and / or,

[0030] A second temperature sensor is provided on the second cooling branch.

[0031] With this configuration, the first temperature sensor is used to monitor the temperature of the radiator, and a second temperature sensor is provided on the second cooling branch to monitor the temperature of the electrical control box.

[0032] The present invention also proposes an excavator, including the thermal management system, on which a cooling flow path is formed, the cooling flow path including a first main road, a first cooling branch road, a second cooling branch road and a short-circuit branch road;

[0033] The thermal management system includes:

[0034] The radiator is located on the first main road;

[0035] The diesel engine is located on the first cooling branch.

[0036] The electrical components to be cooled are located on the second cooling branch; and,

[0037] A switching device is used to switch the two ends of the first main road to be connected to the two ends of the first cooling branch or the two ends of the second cooling branch, or to switch the two ends of the short-circuit branch to be connected to the two ends of the second cooling branch to form a self-circulating flow path, so that the thermal management system has multiple cooling modes.

[0038] The present invention also proposes a thermal management control method, wherein the electrical device to be cooled includes an electric motor;

[0039] The thermal management control method includes the following steps:

[0040] Obtain the first state of the diesel engine and the second state of the electric motor;

[0041] Thus, the operator can determine the first state of the diesel engine by observing whether it is acting as a power source, and the second state by observing whether the electric motor is acting as a power source. The operator can obtain these two states simply by observing.

[0042] A switching strategy is determined based on the first state and the second state, and the switching device is controlled to switch operations according to the switching strategy.

[0043] Thus, the operator then determines how to perform the switching operation on the switching device based on the first and second states obtained.

[0044] Optionally, determining a switching strategy based on the first state and the second state, and controlling the switching device to switch operations according to the switching strategy, includes:

[0045] When the diesel engine is in operation and the electric motor is not in operation, the switching device is controlled to switch the two ends of the first main road to the two ends of the first cooling branch.

[0046] Thus, when the diesel engine is the power source, the diesel engine needs to be cooled. The operator can then operate the switching device to connect the two ends of the first main road with the two ends of the first cooling branch road, thereby cooling the diesel engine.

[0047] When the diesel engine is not in operation and the electric motor is in operation, the switching device is controlled to switch the two ends of the first main road to the two ends of the second cooling branch.

[0048] Thus, when the motor is the power source, the motor needs to dissipate heat and cool down. The operator can then operate the switching device to connect the two ends of the first main circuit with the two ends of the second cooling branch circuit, thereby cooling down the motor.

[0049] When the diesel engine switches from an operating state to a non-operating state, and correspondingly the electric motor switches from a non-operating state to an operating state, the first current temperature parameter on the first main road is obtained, a delay switching strategy is determined based on the first current temperature parameter, and the switching device is controlled to switch operation according to the delay switching strategy.

[0050] Thus, when the power source is switched, if the power is switched from diesel engine power to electric motor power, the water temperature is first judged, and the switching device is operated based on the first current temperature parameter.

[0051] Optionally, when the diesel engine switches from a non-operating state to an operating state, and correspondingly the electric motor switches from an operating state to a non-operating state, a first current temperature parameter on the first main road is acquired, a delayed switching strategy is determined based on the first current temperature parameter, and the switching device is controlled to switch operation according to the delayed switching strategy, including:

[0052] When the first current temperature parameter is less than or equal to a preset threshold, the switching device is controlled to switch the two ends of the first main road to the two ends of the second cooling branch.

[0053] Thus, when the first current temperature parameter of the first branch is less than or equal to a preset threshold, i.e., the temperature of the first (radiator inlet) temperature sensor is less than or equal to degrees Celsius, the switching device directly switches to the second cooling branch. The preset threshold can be set according to different heat dissipation temperature requirements.

[0054] When the first current temperature parameter is greater than a preset threshold, the second current temperature parameter on the second cooling branch is obtained, and the switching device is controlled to switch the two ends of the short-circuited branch to connect with the two ends of the second cooling branch to form a self-circulating flow path, until the first current temperature parameter is less than the second current temperature parameter, the switching device is controlled to switch the two ends of the first main road to connect with the two ends of the second cooling branch.

[0055] Thus, when the first current temperature parameter of the first branch is greater than a preset threshold, i.e., the temperature of the first (radiator inlet) temperature sensor is greater than a certain degree Celsius, the switching device is first switched to the self-circulating flow path, waiting for the temperature of the first cooling branch to decrease, until the temperature of the second (electric control box inlet) temperature sensor is greater than or equal to the temperature of the first (radiator inlet) temperature sensor, and then switched to the second cooling branch. The preset threshold can be set according to different heat dissipation temperature requirements.

[0056] Optionally, the thermal management system further includes a fan;

[0057] After acquiring the second current temperature parameter on the second cooling branch and controlling the switching device to switch the two ends of the short-circuited branch to connect with the two ends of the second cooling branch to form a self-circulating flow path, the method further includes:

[0058] Control the fan to operate at rated power.

[0059] This causes the radiator to cool down rapidly, and consequently, the displayed temperature of the first (radiator inlet) temperature sensor decreases.

[0060] In the technical solution provided by this invention, the thermal management system includes a cooling flow path, which comprises a first main road, a first cooling branch road, a second cooling branch road, and a short-circuit branch road. The cooling circuit has a simple structure and simple wiring, facilitating disassembly and maintenance. The thermal management system includes a radiator, a diesel engine, electrical components to be cooled, and a switching device. The radiator is located on the first main road, the diesel engine is located on the first cooling branch road, and the electrical components to be cooled are located on the second cooling branch road. By providing the switching device, it can be used to switch the connection between the two ends of the first main road and the two ends of the first cooling branch, or the switching device can be operated to switch the connection between the two ends of the first main road and the second cooling branch. In this way, the first cooling branch or the second cooling branch can be turned on separately according to actual needs, so as to realize the cooling of the diesel engine functional component located in the first cooling branch or the electrical component to be cooled in the second cooling branch. The switching device can also be used to switch the connection between the two ends of the short-circuit branch and the two ends of the second cooling branch to form a self-circulating flow path, so as to realize that the second cooling branch can circulate independently. Attached Figure Description

[0061] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0062] Figure 1 A three-dimensional structural schematic diagram of an embodiment of the thermal management system provided by the present invention;

[0063] Figure 2 A flowchart illustrating an embodiment of the thermal management system control method provided by the present invention;

[0064] Figure 3 for Figure 1 A schematic diagram of the principle of a three-position four-way valve.

[0065] The following are the reference numerals: 100, Thermal Management System; 1, Radiator; 2, Expansion Tank; 3, First (Radiator Inlet) Temperature Sensor; 4, Three-position Four-way Valve; 5, Diesel Engine; 6, Three-way Valve; 7, Electric Motor; 8, Electrical Control Box; 9, Booster Pump; 10, Second (Electrical Control Box Inlet) Temperature Sensor; 11, Three-way Valve; 12, Fan.

[0066] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0067] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0068] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0069] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0070] Compared to traditional excavators, dual-power excavators possess both a traditional diesel engine power output system and a pure electric power output system. When no convenient power source is available, the traditional diesel engine provides power; when a suitable industrial power supply is available, the electric motor is connected via cable and electronic control system to provide power. Because they have two independent power output systems, and one system requires high-temperature cooling (the thermal equilibrium temperature of the diesel engine system is generally above 95℃) while the other requires medium-temperature cooling (the thermal equilibrium temperature of the electric motor and electronic control system is generally below 65℃), the traditional solution is to equip them with two separate cooling systems. This has the following five significant drawbacks: 1. Insufficient space for cooling system layout; 2. High cost of cooling system; 3. Low utilization rate of cooling system; 4. Large amount of materials in the cooling system, leading to a high failure rate; 5. Complicated assembly and maintenance of the cooling system. Therefore, an integrated cooling system solution is needed to ensure the cooling needs of both power output systems simultaneously under a single cooling system, significantly reducing cooling system costs and solving the problem of insufficient space for overall machine layout and related issues.

[0071] Therefore, the present invention provides a thermal management system 100 and its control method. Figure 1 This is one embodiment provided by the present invention.

[0072] Please see Figure 1 The diagram below illustrates an embodiment of the present invention. A thermal management system 100 is provided, comprising a cooling flow path, including a first main path, a first cooling branch path, a second cooling branch path, and a short-circuit branch path. The thermal management system 100 includes a radiator 1, a diesel engine 5, electrical components to be cooled, and a switching device. The radiator 1 is located on the first main path, the diesel engine 5 is located on the first cooling branch path, and the electrical components to be cooled are located on the second cooling branch path. The switching device is configured to connect the two ends of the first main path with the two ends of the first cooling branch path, or connect the two ends of the first main path with the two ends of the second cooling branch path, or connect the two ends of the short-circuit branch path with the two ends of the second cooling branch path to form a self-circulating flow path. This allows the thermal management system 100 to have multiple cooling modes, which can be adjusted according to actual needs.

[0073] In the technical solution provided by this invention, the thermal management system 100 includes a cooling flow path, which includes a first main road, a first cooling branch road, a second cooling branch road, and a short-circuit branch road. The cooling circuit has a simple structure and simple wiring, making it convenient for disassembly and maintenance. The thermal management system 100 includes a radiator 1, a diesel engine 5, electrical components to be cooled, and a switching device. The radiator 1 is located on the first main road, the diesel engine 5 is located on the first cooling branch road, and the electrical components to be cooled are located on the second cooling branch road. By providing the switching device, it can be used to switch the connection between the two ends of the first main road and the two ends of the first cooling branch, or the switching device can be operated to switch the connection between the two ends of the first main road and the second cooling branch. In this way, the first cooling branch or the second cooling branch can be turned on separately according to actual needs, so as to realize the cooling of the diesel engine 5, which is located in the first cooling branch, or the electrical device to be cooled, which is located in the second cooling branch. The switching device can also be used to switch the connection between the two ends of the short-circuit branch and the two ends of the second cooling branch to form a self-circulating flow path, so as to realize that the second cooling branch can circulate independently.

[0074] In this embodiment, to switch between different routes to adapt to actual needs, the switching device includes a first switching device and a second switching device. The first switching device can be used to switch the connection between the two ends of the first main road and the two ends of the first cooling branch, or it can be operated to switch to connect the two ends of the first main road and the second cooling branch. (See reference...) Figure 1 The first main circuit consists of a radiator 1, an expansion tank 2 connected to the radiator, and a first (radiator inlet) temperature sensor 3 for detecting the inlet water temperature of the radiator 1. A diesel engine 5 is installed in the first main circuit. When the first switching device switches to connect both ends of the first main circuit to the first cooling branch circuit, the radiator 1 on the main circuit is connected to the diesel engine 5, thereby cooling the diesel engine 5 to its normal operating temperature. The second cooling branch circuit includes a motor 7, an electronic control box 8, a pressure pump 9, and a second (electronic control box inlet) temperature sensor 10 for detecting the temperature of the electronic control box 8. When the first switching device switches to connect both ends of the first main circuit to the second cooling branch circuit, the radiator 1 on the main circuit is connected to the electrical component to be cooled, thereby cooling the electrical component. In this embodiment, the component to be cooled includes the motor 7 and the electronic control box 8. Thus, the first cooling branch circuit and the second cooling branch circuit are connected in parallel and share a main circuit, namely the first main circuit. This reduces costs, as the two pathways can be opened or closed simply by operating the first switching device.

[0075] The second switching device is used to switch the connection between the two ends of the short-circuit branch and the two ends of the second cooling branch, thereby forming a self-circulating flow path. The short-circuit branch allows the components on the second cooling branch—motor 7, control box 8, pressurization pump 9, and the second (control box inlet) temperature sensor 10 for detecting the temperature of the control box 8—to operate in a self-circulating flow path. This configuration allows the cooling system to be turned on or off via the self-circulating flow path simply by operating the second switching device.

[0076] In this embodiment, the first switching device includes a three-position four-way valve 4. The three-position four-way valve 4 has four main water ports: P main water port, T main water port, A main water port, and B main water port. The P main water port is connected to the first main line, the T main water port is connected to the short-circuit branch, the A main water port is connected to the first cooling branch, and the B main water port is connected to the second cooling branch. The three-position four-way valve 4 has four water ports (generally two inlets and two outlets), denoted by P, T, A, and B respectively. P is the inlet, T is the outlet, and A and B are connected to the upper and lower chambers of the actuator, respectively. The valve is in the neutral position in its natural position. Using the three-position four-way valve 4 allows one valve component to be connected to the first main line, the short-circuit branch, the first cooling branch, and the second cooling branch.

[0077] The second switching device includes two three-way valves 6 / 11. Each three-way valve 6 / 11 has three connecting ports. In one three-way valve 6, two connecting ports are respectively connected to one end of the second cooling branch, and the remaining connecting port is connected to one end of the short-circuit branch. In the other three-way valve 11, two connecting ports are respectively connected to the other end of the second cooling branch, and the remaining connecting port is connected to the other end of the short-circuit branch. The three-way valve 6 / 11 refers to a valve device with three ports, one inlet and two outlets. The three-way valve 6 / 11 is readily available, easy to install, and low in cost. By setting up the two three-way valves 6 / 11, the connection between the two ends of the short-circuit branch and the two ends of the second cooling branch can be switched to form a self-circulating flow path.

[0078] The electrical components to be cooled include at least one of a motor 7 and an electrical control box 8. The electrical control box 8 is a functional component used to control, measure, signal, protect, and regulate the motor 7, and is configured to be cooled in the first cooling circuit. It should be noted that at least one component to be cooled must be included in the cooling cycle of the first cooling circuit.

[0079] Furthermore, in this technical solution, a booster pump 9 is also installed on the second cooling branch. The booster pump 9 is a common mechanical device that increases low water pressure and flow rate. It provides additional power to raise the water pressure to the required level, forcing water to flow through the pipe at a faster speed, resulting in faster and greater water flow in the second cooling circuit. The working principle of the booster pump 9 is to compress liquids or gases through mechanical or electrical power, enabling them to flow or be transported to where they are needed. The working principle of the booster pump 9 can be divided into two types: positive displacement pumps and centrifugal pumps. Positive displacement pumps compress liquids or gases through mechanical or electrical power, enabling them to flow or be transported to where they are needed. Centrifugal pumps compress liquids or gases through centrifugal force, enabling them to flow or be transported to where they are needed.

[0080] Furthermore, in this embodiment, the radiator 1 is also connected to an expansion tank 2, which is installed on the upper part of the radiator 1. In this embodiment, steam condenses into water, which can then enter the expansion tank 2 through a water pipe, maintaining a high water pressure at the inlet of the booster pump 9, thereby increasing the pump water volume at the second cooling branch.

[0081] The thermal management system 100 also includes a fan 12, which is positioned close to the radiator 1 to cool the radiator 1, thereby rapidly reducing the temperature of the radiator 1 to normal.

[0082] Furthermore, a first temperature sensor 3 is provided on the first main road to monitor the temperature of the radiator 1, and a second temperature sensor 10 is provided on the second cooling branch to monitor the temperature of the electrical control box 8.

[0083] The present invention also proposes an excavator, and in another embodiment, it further includes a dual-power vehicle. The excavator includes a thermal management system 100, the specific structure of which is as described in the above embodiments. Since the excavator adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0084] Based on the aforementioned thermal management system 100, Figure 2 This is an embodiment of the thermal management control method provided by the present invention. Please refer to... Figure 2 In this embodiment, the electrical device to be cooled includes a motor 7, and the thermal management control method includes the following steps:

[0085] Step S1: Obtain the first state of the diesel engine 5 and the second state of the electric motor 7;

[0086] The operator can determine the first state of the diesel engine 5 by observing whether the diesel engine 5 is used as a power source, and the second state by observing whether the electric motor 7 is used as a power source to output power. The two states can be obtained by the operator through simple observation.

[0087] Step S2: Determine a switching strategy based on the obtained first state and second state, and control the switching device to switch operations according to the switching strategy;

[0088] The operator then determines how to perform the switching operation on the switching device based on the first and second states obtained.

[0089] Further, a switching strategy is determined based on the obtained first state and second state, and the switching device is controlled to switch operations according to the switching strategy, including:

[0090] Step S21: When the diesel engine 5 is in working condition and the electric motor 7 is in non-working condition, control the switching device to switch the two ends of the first main road to the two ends of the first cooling branch road.

[0091] When the diesel engine 5 is the power source, the diesel engine 5 needs to be cooled. The operator operates the switching device to connect the two ends of the first main road with the two ends of the first cooling branch road, thereby cooling the diesel engine 5.

[0092] Step S22: When the diesel engine 5 is in a non-working state and the electric motor 7 is in a working state, control the switching device to switch the two ends of the first main road to the two ends of the second cooling branch road;

[0093] When the motor 7 is the power source, the motor 7 needs to dissipate heat and cool down. The operator operates the switching device to connect the two ends of the first main road with the two ends of the second cooling branch, thereby cooling down the motor 7.

[0094] Step S23: When the diesel engine 5 switches from the working state to the non-working state, and correspondingly the electric motor 7 switches from the non-working state to the working state, the first current temperature parameter on the first main road is obtained, a delay switching strategy is determined based on the first current temperature parameter, and the switching device is controlled to switch working according to the delay switching strategy.

[0095] When the power source is switched, if the power is switched from diesel engine 5 to electric motor 7, the water temperature is first judged, and the switching device is operated based on the first current temperature parameter.

[0096] When the diesel engine 5 switches from an operating state to a non-operating state, and correspondingly, the electric motor 7 switches from a non-operating state to an operating state, a first current temperature parameter on the first main road is acquired, a delayed switching strategy is determined based on the first current temperature parameter, and the switching device is controlled to switch operation according to the delayed switching strategy, including:

[0097] Step S231: When the first current temperature parameter is less than or equal to a preset threshold, control the switching device to switch the two ends of the first main road to be connected to the two ends of the second cooling branch.

[0098] When the first current temperature parameter of the first branch is less than or equal to a preset threshold, i.e., the temperature of the first (radiator inlet) temperature sensor 3 is less than or equal to 60 degrees Celsius, the switching device directly switches to the second cooling branch. The preset threshold can be set according to different heat dissipation temperature requirements.

[0099] Step S232: When the first current temperature parameter is greater than the preset threshold, obtain the second current temperature parameter on the second cooling branch, and control the switching device to switch the two ends of the short-circuit branch to connect with the two ends of the second cooling branch to form a self-circulating flow path, until the first current temperature parameter is less than the second current temperature parameter, and control the switching device to switch the two ends of the first main road to connect with the two ends of the second cooling branch.

[0100] When the current temperature parameter of the first branch is greater than a preset threshold, i.e., the temperature of the first (radiator inlet) temperature sensor 3 is greater than 60 degrees Celsius, the switching device is first switched to the self-circulating flow path, and the temperature of the first cooling branch is waited for to decrease until the temperature of the second (electric control box 8 inlet) temperature sensor 10 is greater than or equal to the temperature of the first (radiator inlet) temperature sensor 3, at which point the device is switched to the second cooling branch. The preset threshold can be set according to different heat dissipation temperature requirements.

[0101] The thermal management system 100 also includes a fan 12;

[0102] After acquiring the second current temperature parameter on the second cooling branch and controlling the switching device to switch the two ends of the short-circuited branch to connect with the two ends of the second cooling branch to form a self-circulating flow path, the method further includes:

[0103] Step S2321: Control the fan 12 to operate at rated power.

[0104] This configuration allows the radiator 1 to cool down quickly, which in turn lowers the displayed temperature of the first (radiator inlet) temperature sensor 3.

[0105] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A thermal management system, characterized by, A cooling flow path is formed on the thermal management system, and the cooling flow path includes a first main flow path, a first cooling branch flow path, a second cooling branch flow path, and a short-circuit flow path; The thermal management system includes: A radiator is arranged on the first main flow path; A diesel engine is arranged on the first cooling branch flow path; An electric device to be cooled is arranged on the second cooling branch flow path; and A switching device is arranged to switch the two ends of the first main flow path to be in communication with the two ends of the first cooling branch flow path or the two ends of the second cooling branch flow path, or to switch the two ends of the short-circuit flow path to be in communication with the two ends of the second cooling branch flow path to form a self-circulation flow path, so that the thermal management system has multiple cooling modes; The switching device includes: A first switching device is arranged to switch the two ends of the first main flow path to be in communication with the two ends of the first cooling branch flow path or the two ends of the second cooling branch flow path; and A second switching device is arranged to switch the two ends of the short-circuit flow path to be in communication with the two ends of the second cooling branch flow path to form a self-circulation flow path; The first switching device includes a three-position four-way valve, and the three-position four-way valve has a P main port, a T main port, an A main port, and a B main port, wherein the P main port is connected to the first main flow path, the T main port is connected to the short-circuit flow path, the A main port is connected to the first cooling branch flow path, and the B main port is connected to the second cooling branch flow path; The second switching device includes two three-way valves, and each three-way valve has three communication ports, wherein in one of the three-way valves, two communication ports are connected at one end of the second cooling branch flow path, and the remaining communication port is connected to one end of the short-circuit flow path, and in the other three-way valve, two communication ports are connected at the other end of the second cooling branch flow path, and the remaining communication port is connected to the other end of the short-circuit flow path.

2. The thermal management system of claim 1, wherein, The electric device to be cooled includes at least one of an electric motor and an electric control box; and / or The electric device to be cooled includes multiple electric devices, and the multiple electric devices are arranged in series on the second cooling branch flow path.

3. The thermal management system of claim 1, wherein, A first temperature sensor is arranged on the first main flow path; and / or A second temperature sensor is arranged on the second cooling branch flow path.

4. An excavator characterized by comprising: The thermal management system includes the thermal management system according to any one of claims 1 to 3.

5. A thermal management control method based on the thermal management system according to any one of claims 1 to 3, characterized in that The electric device to be cooled includes an electric motor; The thermal management control method includes the following steps: Obtaining a first state of the diesel engine and a second state of the electric motor; According to the first state and the second state, a switching strategy is determined, and the switching device is controlled to switch according to the switching strategy.

6. The thermal management control method of claim 5, wherein, According to the first state and the second state, a switching strategy is determined, and the switching device is controlled to switch according to the switching strategy. When the diesel engine is in a working state and the electric motor is in a non-working state, the switching device is controlled to switch the two ends of the first main flow path to be in communication with the two ends of the first cooling branch flow path; When the diesel engine is in a non-working state and the electric motor is in a working state, the switching device is controlled to switch the two ends of the first main flow path to be in communication with the two ends of the second cooling branch flow path; When the diesel engine is switched from the working state to the non-working state, and correspondingly, the electric motor is switched from the non-working state to the working state, a first current temperature parameter on the first main path is acquired, a delay switching strategy is determined according to the first current temperature parameter, and the switching device is controlled to switch according to the delay switching strategy.

7. The thermal management control method of claim 6, wherein, When the diesel engine is switched from the non-working state to the working state, and correspondingly, the electric motor is switched from the working state to the non-working state, a first current temperature parameter on the first main path is acquired, a delay switching strategy is determined according to the first current temperature parameter, and the switching device is controlled to switch according to the delay switching strategy, including: When the first current temperature parameter is less than or equal to a preset threshold, the switching device is controlled to switch the two ends of the first main path to be in communication with the two ends of the second cooling branch; When the first current temperature parameter is greater than the preset threshold, a second current temperature parameter on the second cooling branch is acquired, and the switching device is controlled to switch the two ends of the short-circuit branch to be in communication with the two ends of the second cooling branch and form a self-circulation flow path, and when the first current temperature parameter is less than the second current temperature parameter, the switching device is controlled to switch the two ends of the first main path to be in communication with the two ends of the second cooling branch.

8. The thermal management control method of claim 7, wherein, The thermal management system further comprises a fan; After the second current temperature parameter on the second cooling branch is acquired, and the switching device is controlled to switch the two ends of the short-circuit branch to be in communication with the two ends of the second cooling branch and form a self-circulation flow path, the method further comprises: The fan is controlled to operate at a rated power.

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