Wet disc brake heat dissipation system of pure electric mining dump truck and control method

Abstract

The invention discloses a wet disc brake heat dissipation system of a pure electric mining dump truck and a control method. The wet disc brake heat dissipation system comprises a vehicle control unit, and a motor, a cooling pump, a filter, an oil-water heat exchanger, a radiator assembly, a water pump assembly, an electric proportional valve, a distribution valve group, a brake, an oil tank, a motor temperature sensor and an oil tank temperature sensor which are in signal connection with the vehicle control unit. The radiator assembly, the water pump assembly and the electric proportional valve are sequentially connected in series to form a radiating body. The oil-water heat exchanger is connected between the electric proportional valve and the radiator assembly in series to form a heat exchanger radiating loop. The motor, the cooling pump, the filter, the oil-water heat exchanger, the distribution valve group and the brake are sequentially connected through pipelines to form a cooling loop. The braking energy dissipation requirement of the large-tonnage electric mine truck is effectively met, and the balance between the heat dissipation efficiency and the energy consumption is achieved through dynamic flow distribution. And a multi-stage temperature early warning mechanism prolongs the service life of system elements while ensuring the braking safety.

Description

Technical Field

[0001] The present invention relates to the technical field of brake heat dissipation for mining vehicles, and in particular to a wet disc brake heat dissipation system and a control method for a pure electric mining dump truck. Background Art

[0002] The existing mining vehicle brake cooling system has the problem of insufficient cooling pump flow, which cannot match the large-tonnage braking energy requirements of electric mining vehicles. The temperature control logic of the traditional system is relatively simple, lacking multi-level warning and dynamic adjustment capabilities, resulting in poor heat dissipation. In addition, the shutdown threshold of the existing system is fixed, which easily leads to frequent starts and stops or insufficient cooling, affecting the stability and service life of the system. In terms of cooling system design, traditional solutions often use a single cooling circuit, which is difficult to meet the needs of hydraulic oil cooling and motor cooling at the same time. The control strategy lacks redundant design for key components such as water pumps and radiators. When a single component fails, it is easy to cause the entire cooling system to fail. In response to the above problems, the existing technology is in urgent need of improvement. Summary of the Invention

[0003] In view of this, the present invention provides a wet disc brake heat dissipation system for a pure electric mining dump truck, which has the advantages of improving heat dissipation efficiency, enhancing system stability and achieving multi-level dynamic temperature control.

[0004] To achieve the above object, the present invention provides the following technical solutions: A wet disc brake cooling system for a pure electric mining dump truck includes: a vehicle controller and a motor connected to the controller's signals, a cooling pump, a filter, an oil-water heat exchanger, a radiator assembly, a water pump assembly, an electric proportional valve, a distribution valve group, a brake, a fuel tank, a motor temperature sensor, and a fuel tank temperature sensor.

[0005] Among them, the radiator assembly, water pump assembly and electric proportional valve are connected in series in sequence to form the heat dissipation main body, and the oil-water heat exchanger is connected in series between the electric proportional valve and the radiator assembly to form a heat exchanger heat dissipation circuit; the motor, cooling pump, filter, oil-water heat exchanger, distribution valve group, and brake are connected in sequence with pipelines to form a cooling circuit, and the cooling pump and distribution valve group are respectively connected to the oil outlet and oil inlet of the oil tank; the motor temperature sensor monitors the temperature of the motor in real time, and the oil tank temperature sensor monitors the oil temperature in the oil tank in real time.

[0006] Preferably, the radiator assembly includes a first radiator and a second radiator, and the first radiator and the second radiator are sequentially connected in series.

[0007] Preferably, the wet disc brake cooling system of the pure electric mining dump truck further includes a water pressure sensor, which is arranged on the second radiator and is signal-connected to the vehicle controller.

[0008] Preferably, the water pump assembly includes a first water pump and a second water pump, and the first water pump and the second water pump are arranged in parallel.

[0009] Preferably, the motor is connected in series between the electric proportional valve and the radiator assembly to form a motor heat dissipation circuit, and the motor and the oil-water radiator share the same heat dissipation body and are arranged in parallel.

[0010] The present invention also proposes a control method for a wet disc brake cooling system of a pure electric mining dump truck, which is applied to the wet disc brake cooling system of the pure electric mining dump truck described in the above embodiment, including: S1, the cooling system is powered on and monitors whether the current motor temperature or oil tank temperature is greater than or equal to the first preset threshold of the motor temperature sensor or the oil tank temperature sensor, and decides whether to start the cooling system according to the judgment result; S2, after the cooling system is started, real-time monitoring is performed to determine whether the current motor temperature or oil tank temperature exceeds the third preset threshold of the motor temperature sensor or the second preset threshold of the oil tank temperature sensor, and decides whether to perform speed limit braking according to the judgment result; S3, when the oil tank temperature is continuously lower than the safety threshold of the oil tank temperature sensor for 30s or more, the cooling system is turned off; S4, when the motor temperature is between the first preset threshold and the second preset threshold of the motor temperature sensor, the flow rate in the motor cooling circuit is maintained at 15% of the total flow rate; when the motor temperature is between the second preset threshold and the third preset threshold of the motor temperature sensor, the flow rate in the motor cooling circuit is maintained at 20% of the total flow rate.

[0011] Preferably, the first preset threshold values ​​of the motor temperature sensor and the oil tank temperature sensor are both 70°C, the second preset threshold values ​​of the motor temperature sensor and the oil tank temperature sensor are 85°C and 110°C respectively, the third preset threshold value of the motor temperature sensor is 100°C, and the safety threshold value of the oil tank temperature sensor is 60°C.

[0012] Preferably, the speed limiting braking includes: the vehicle controller sends a high temperature fault code and limits the vehicle speed to 5 km / h.

[0013] The beneficial effects of this invention are as follows: Compared with existing technologies, this application effectively matches the braking energy dissipation requirements of large-tonnage electric mining vehicles, achieving a balance between heat dissipation efficiency and energy consumption through dynamic flow distribution. The multi-level temperature warning mechanism ensures braking safety while extending the service life of system components.

[0014] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the wet disc brake heat dissipation system of a pure electric mining dump truck of the present invention; Figure 2 The present invention is a flow chart of a method for controlling the heat dissipation of wet disc brakes on a pure electric mining dump truck. DETAILED DESCRIPTION

[0016] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0017] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0018] Reference below Figure 1 and Figure 2 The wet disc brake heat dissipation system of a pure electric mining dump truck in an embodiment of the present invention is described.

[0019] The present application discloses a wet disc brake cooling system for a pure electric mining dump truck, comprising: a vehicle controller and a motor connected to its signals, a cooling pump, a filter, an oil-water heat exchanger, a radiator assembly, a water pump assembly, an electric proportional valve, a distribution valve group, a brake, a fuel tank, a motor temperature sensor, and a fuel tank temperature sensor. The radiator assembly, the water pump assembly, and the electric proportional valve are connected in series to form a heat dissipation main body, and the oil-water heat exchanger is connected in series between the electric proportional valve and the radiator assembly to form a heat exchanger cooling circuit; the motor, the cooling pump, the filter, the oil-water heat exchanger, the distribution valve group, and the brake are connected in series by pipelines to form a cooling circuit, and the cooling pump and the distribution valve group are respectively connected to the oil outlet and oil inlet of the fuel tank; the motor temperature sensor monitors the temperature of the motor in real time, and the fuel tank temperature sensor monitors the temperature of the oil in the fuel tank in real time.

[0020] The radiator assembly dissipates heat from the coolant. The water pump assembly is the power unit that drives the coolant circulation. The electric proportional valve is a solenoid-controlled valve with adjustable flow, dynamically adjusting the valve opening based on controller signals. The oil-water heat exchanger facilitates heat exchange between the hydraulic oil and the coolant. The distribution valve assembly is a valve assembly that controls the flow of hydraulic oil. This can be achieved using an integrated multi-way valve block with a built-in check valve to prevent backflow.

[0021] Specifically, when the brakes generate heat, a cooling pump drives hydraulic oil out of the tank, where it passes through a filter to remove impurities before entering an oil-to-water heat exchanger. During this process, the hot hydraulic oil transfers heat to the coolant, which then flows through the radiator assembly for secondary heat dissipation. An electric proportional valve adjusts the flow rate in the heat exchanger's cooling circuit based on temperature sensor data. A distribution valve block distributes the cooled hydraulic oil to each brake as needed, forming a closed-loop system. The vehicle controller collects real-time temperature data from the motor and fuel tank.

[0022] Compared to existing technologies, traditional systems utilize a single cooling circuit and fixed-flow pump design, making them unable to cope with the transient high heat loads generated by braking large-tonnage vehicles. This solution overcomes the efficiency bottleneck of a single medium by integrating a heat exchanger cooling circuit with a cooling circuit in parallel. A dynamic flow distribution strategy addresses the energy waste associated with fixed thresholds in traditional systems, while the introduction of an electric proportional valve enables precise control of cooling intensity. Data fusion from dual temperature sensors significantly improves the system's adaptability to complex operating conditions, preventing system failures caused by the failure of a single monitoring point.

[0023] Through the above technical solution, this application effectively matches the braking energy dissipation requirements of large-tonnage electric mining vehicles, achieving a balance between heat dissipation efficiency and energy consumption through dynamic flow distribution. The multi-level temperature warning mechanism ensures braking safety while extending the service life of system components.

[0024] In some embodiments, for example Figure 1 As shown, the radiator assembly includes a first radiator and a second radiator, and the first radiator and the second radiator are arranged in series in sequence. Specifically, when the cooling medium flows through the radiator assembly, it first enters the first radiator to complete the initial heat exchange, and the heat carried by the medium is partially discharged at this time. The medium then enters the second radiator for deep heat dissipation, and the temperature gradient is reduced through two consecutive heat exchange processes. This staged heat dissipation method allows the two radiators to be optimized for media in different temperature zones. For example, the first radiator adopts a large flow channel structure to cope with high-temperature heat dissipation media, and the second radiator adopts a dense fin structure to improve the thermal efficiency of the low-temperature zone. Compared with the single radiator solution, the series layout effectively reduces the volume constraint of a single radiator by splitting the heat dissipation area into two independent units while maintaining the same heat dissipation area, thereby adapting to the limited space of the mining vehicle chassis.

[0025] Compared to existing technologies, traditional solutions use a single large radiator, which increases its size to meet heat dissipation requirements, resulting in limited installation space and the tendency for heat accumulation in localized areas. This solution, by connecting two radiators in series, splits the heat dissipation area into two compact units while maintaining the same heat dissipation capacity. This not only resolves the installation space constraint but also avoids efficiency degradation caused by concentrated heat flow in high-temperature areas by dissipating heat in stages.

[0026] Through the above-mentioned technical solution, this application achieves a compact layout of the radiator assembly, effectively improving heat dissipation efficiency within the limited space of a mining vehicle. The dual-radiator series structure reduces the peak heat load of a single radiator through a hierarchical heat exchange process, while avoiding the installation interference issues caused by the large radiator volume in traditional solutions. The staged heat dissipation design also reduces the media's residence time in high-temperature areas, thereby reducing the risk of high-temperature oil degradation.

[0027] In some embodiments, for example Figure 1 As shown, the wet disc brake cooling system for a pure electric mining dump truck also includes a water pressure sensor, mounted on the second radiator and connected to the vehicle controller. Specifically, when the water circulation system is operating normally, the water pressure at the second radiator's outlet remains within a set range. If scaling or pipe blockage occurs within the radiator, the terminal pressure will increase abnormally; if a pipe leak occurs or the water pump output is insufficient, the terminal pressure will decrease abnormally. The water pressure sensor transmits real-time pressure data to the vehicle controller, which determines the system status based on preset pressure thresholds. If the pressure exceeds a safe range, an adjustment mechanism is automatically triggered. For example, if the pressure is too low, a backup water pump is activated to increase the flow rate; if the pressure is too high, an electric proportional valve is used to divert some coolant to other circuits. This closed-loop control method based on terminal pressure monitoring enables timely intervention in the early stages of water circulation system anomalies, preventing the loss of cooling efficiency caused by pressure imbalance.

[0028] Through the above technical solution, this application effectively solves the problem of reduced heat dissipation efficiency caused by abnormal pressure in the water circulation system. Through terminal pressure monitoring and dynamic adjustment mechanisms, compensatory measures are quickly initiated when pipeline blockage or leakage occurs, preventing the continued deterioration of heat dissipation capacity. At the same time, it achieves optimized control of the water pump operation mode, reducing redundant energy consumption while ensuring heat dissipation requirements, and lowering the risk of component damage caused by abnormal pressure.

[0029] In some embodiments, the water pump assembly includes a first water pump and a second water pump, and the first water pump and the second water pump are arranged in parallel. Specifically, under normal operating conditions, the first water pump and the second water pump can operate simultaneously to generate superimposed flow to meet high-load heat dissipation requirements. When a single water pump fails, the remaining water pumps can still maintain the basic flow output to ensure the continuous operation of the cooling system. Under low-load conditions, it is possible to choose to start only a single water pump to reduce energy consumption. Through the CAN bus instructions sent by the vehicle controller, it is possible to switch in real time between the single-pump operation mode and the dual-pump collaborative mode to achieve dynamic adjustment of the flow output.

[0030] Through the technical scheme, the application effectively solves the problem of low cooling efficiency caused by insufficient water pump flow regulation capacity, and avoids the risk of system paralysis caused by single point failure through the double pump redundancy design. The flow grading control mechanism can dynamically match the water pump operating state according to the actual heat dissipation demand, thereby optimizing the energy utilization rate while ensuring the heat dissipation efficiency.

[0031] In some embodiments, the motor is connected in series between the electric proportional valve and the radiator assembly to form a motor heat dissipation circuit, the motor shares the same heat dissipation main body with the oil-water radiator and is arranged in parallel with the oil-water radiator. Specifically, during the cooling liquid circulation process, the electric proportional valve adjusts the valve opening degree according to the real-time data of the motor temperature sensor and the oil tank temperature sensor to distribute the flow entering the two parallel circuits. When the motor temperature rises, the electric proportional valve increases the flow proportion of the motor heat dissipation circuit, so that more cooling liquid flows through the motor surface to take away heat, and then enters the radiator assembly to complete heat exchange. The cooling liquid in the oil-water heat exchanger circuit performs heat transfer with the hydraulic oil through the oil-water heat exchanger, and then returns to the radiator assembly for heat dissipation. The two circuits share the same radiator assembly, and the heat is discharged through forced convection by the radiator fan. If any one of the circuits fails, the other circuit can still maintain the basic heat dissipation function through the remaining flow, and the electric proportional valve automatically adjusts the flow distribution ratio to compensate for the failure.

[0032] Through the technical scheme, the application solves the problem of structural complexity caused by the independent radiator layout in the traditional brake heat dissipation system, reduces the number of pipeline connections and installation space requirements. Through the parallel double circuit and dynamic flow distribution, the utilization efficiency of the cooling liquid between the motor and the oil-water heat exchanger is improved, and the heat export time is shortened. In the event of a single circuit failure, the remaining circuit can still maintain the heat dissipation function, thereby enhancing the system operation reliability.

[0033] The application also provides a control method of the wet disc brake heat dissipation system of the pure electric mine dump truck, which is applied to the wet disc brake heat dissipation system of the pure electric mine dump truck described in the embodiments, and includes the following steps: S1, powering on the heat dissipation system and monitoring whether the current motor temperature or oil tank temperature is greater than or equal to a first preset threshold value of the motor temperature sensor or the oil tank temperature sensor, and determining whether to start the heat dissipation system according to the monitoring result; S2, after the heat dissipation system is started, monitoring whether the current motor temperature or oil tank temperature exceeds a third preset threshold value of the motor temperature sensor or a second preset threshold value of the oil tank temperature sensor, and determining whether to perform speed limiting braking according to the monitoring result; S3, when the oil tank temperature continuously drops below a safety threshold value of the oil tank temperature sensor for 30 seconds or more, the heat dissipation system is turned off; and S4, when the motor temperature is between the first preset threshold value and the second preset threshold value of the motor temperature sensor, the flow in the motor heat dissipation circuit accounts for 15% of the total flow; and when the motor temperature is between the second preset threshold value and the third preset threshold value of the motor temperature sensor, the flow in the motor heat dissipation circuit accounts for 20% of the total flow.

[0034] wherein the first preset threshold is the lowest temperature condition triggering the start of the heat dissipation system, for avoiding energy waste caused by premature start. The second preset threshold is the secondary temperature limit condition of different monitoring objects, for matching the material property difference between the motor and the hydraulic oil. The third preset threshold is the temperature critical value triggering the forced protection measure, for preventing the equipment from overheating damage. The safety threshold is the sustained low temperature condition for determining the heat dissipation requirement to be removed, for eliminating the false closing caused by temperature fluctuation. The flow rate proportional regulation is a control mode for dynamically distributing the flow rate of the heat dissipation circuit according to the temperature interval, which can be specifically realized by the linkage of the electric proportional valve opening degree regulation and the water pump power control, for balancing the heat dissipation efficiency and energy consumption. The speed limiting brake is a vehicle speed forced limiting measure under high temperature fault, for reducing the heat load caused by continuous braking.

[0035] Further, the first preset threshold of the motor temperature sensor and the oil tank temperature sensor is 70℃, the second preset threshold of the motor temperature sensor and the oil tank temperature sensor is 85℃ and 110℃ respectively, the third preset threshold of the motor temperature sensor is 100℃, and the safety threshold of the oil tank temperature sensor is 60℃. The speed limiting brake includes: the vehicle control unit sends a high temperature fault code and limits the vehicle speed to 5km / h.

[0036] Specifically, the system continuously monitors the motor temperature and the oil tank temperature after power-on, and starts the heat dissipation system when any of the temperatures reaches 70℃. During the heat dissipation operation, if the motor temperature rises to 85℃, the electric proportional valve is adjusted to increase the flow rate of the motor heat dissipation circuit to 15% of the total flow rate, and if it further rises to 100℃, the flow rate is increased to 20%. If the oil tank temperature exceeds 110℃ or the motor temperature exceeds 100℃, a protection action of limiting the speed to 5km / h is triggered. When the oil tank temperature is below 60℃ for 30 seconds continuously, it is determined that the heat dissipation requirement is over and the system is shut down. In this control process, the motor temperature threshold is set lower than the oil tank temperature threshold, reflecting the difference in temperature resistance of the insulation material of the motor winding. The flow rate proportion increases in steps as the temperature rises, ensuring that the heat dissipation capacity and the heat load grow synchronously. The sustained 30-second low temperature determination condition effectively filters transient temperature fluctuations, avoiding frequent start and stop of the system.

[0037] Compared with the prior art, the traditional scheme uses a single temperature threshold to control the start and stop of the heat dissipation system, and lacks a dynamic flow rate adjustment mechanism, resulting in repeated start and stop of the system near the critical temperature or mismatch between the cooling capacity and the heat load. By setting three temperature thresholds and two flow rate adjustment levels, this scheme forms a nonlinear correspondence between temperature and flow rate, making the heat dissipation system respond more closely to the actual heat load change curve. At the same time, the shutdown determination condition is changed from instantaneous temperature judgment to sustained low temperature monitoring, significantly reducing the probability of false operation. Compared with the traditional fixed threshold protection, this scheme realizes independent protection strategies for key components through dual monitoring of the motor and the oil tank and differentiated threshold settings.

[0038] Through the above technical solution, this application solves the problem of insufficient dynamic adjustment capability of traditional brake cooling systems due to a single temperature control logic, and achieves precise matching of cooling capacity through a multi-level temperature threshold and flow linkage mechanism. It effectively avoids the frequent system start and stop phenomenon caused by a fixed shutdown threshold, and uses the continuous low temperature judgment condition to ensure stable operation of the system. A hierarchical safety protection system has been established, and a high-temperature speed limit braking function has been added on the basis of conventional heat dissipation control to prevent equipment overheating and failure under extreme working conditions. By setting the temperature thresholds of the motor and the fuel tank differently, the thermal management strategy of components made of different materials is optimized, thereby improving the overall reliability of the system.

[0039] Other structures and operations of the wet disc brake heat dissipation system and control method for a pure electric mining dump truck according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0040] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0041] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A wet disc brake heat dissipation system for a pure electric mining dump truck, characterized in that: include: Vehicle controller and the motor, cooling pump, filter, oil-water heat exchanger, radiator assembly, water pump assembly, electric proportional valve, distribution valve group, brake, fuel tank, motor temperature sensor and fuel tank temperature sensor connected to its signals; The radiator assembly, the water pump assembly and the electric proportional valve are sequentially connected in series to form a heat dissipation body, and the oil-water heat exchanger is connected in series between the electric proportional valve and the radiator assembly to form a heat exchanger heat dissipation circuit; the motor, the cooling pump, the filter, the oil-water heat exchanger, the distribution valve group and the brake are sequentially connected by pipelines to form a cooling circuit, and the cooling pump and the distribution valve group are respectively connected to the oil outlet and oil inlet of the oil tank; The motor temperature sensor monitors the temperature of the motor in real time, and the oil tank temperature sensor monitors the temperature of the oil in the oil tank in real time.

2. The wet disc brake heat dissipation system for a pure electric mining dump truck according to claim 1 is characterized in that: The radiator assembly includes a first radiator and a second radiator, and the first radiator and the second radiator are sequentially connected in series.

3. The wet disc brake heat dissipation system for a pure electric mining dump truck according to claim 2 is characterized in that: It also includes a water pressure sensor, which is arranged on the second radiator and is connected to the vehicle controller signal.

4. The wet disc brake heat dissipation system for a pure electric mining dump truck according to claim 1 is characterized in that: The water pump assembly includes a first water pump and a second water pump, and the first water pump and the second water pump are arranged in parallel.

5. The wet disc brake heat dissipation system for a pure electric mining dump truck according to claim 1 is characterized in that: The motor is connected in series between the electric proportional valve and the radiator assembly to form a motor heat dissipation circuit. The motor and the oil-water radiator share the same heat dissipation body and are arranged in parallel.

6. A control method for a wet disc brake heat dissipation system of a pure electric mining dump truck, characterized in that: The wet disc brake cooling system for a pure electric mining dump truck according to any one of claims 1 to 5 comprises: S1. Power on the cooling system and monitor whether the current motor temperature or fuel tank temperature is greater than or equal to a first preset threshold of the motor temperature sensor or fuel tank temperature sensor, and decide whether to start the cooling system based on the judgment result; S2. After the cooling system is started, the current motor temperature or fuel tank temperature is monitored in real time to see whether it exceeds the third preset threshold of the motor temperature sensor or the second preset threshold of the fuel tank temperature sensor, and whether to perform speed limit braking based on the judgment result; S3: When the fuel tank temperature remains below the safety threshold of the fuel tank temperature sensor for 30 seconds or longer, the cooling system is shut down. S4. When the motor temperature is between the first preset threshold value and the second preset threshold value of the motor temperature sensor, the flow rate in the motor heat dissipation circuit is maintained at 15% of the total flow rate; when the motor temperature is between the second preset threshold value and the third preset threshold value of the motor temperature sensor, the flow rate in the motor heat dissipation circuit is maintained at 20% of the total flow rate.

7. The method for controlling a wet disc brake heat dissipation system of a pure electric mining dump truck according to claim 6, characterized in that: The first preset threshold values ​​of the motor temperature sensor and the fuel tank temperature sensor are both 70°C, the second preset threshold values ​​of the motor temperature sensor and the fuel tank temperature sensor are 85°C and 110°C respectively, the third preset threshold value of the motor temperature sensor is 100°C, and the safety threshold value of the fuel tank temperature sensor is 60°C.

8. The method for controlling a wet disc brake heat dissipation system of a pure electric mining dump truck according to claim 6, characterized in that: Speed ​​limiting braking includes: the vehicle controller sends a high temperature fault code and limits the vehicle speed to 5km / h.

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