Hydraulic brake control system, control method and mining dump truck

Abstract

The hydraulic brake control system comprises a main power source, the main power source is connected with an emergency power source, the main power source is connected with a brake through a transmission control device, and the brake is connected with wheels; a hydraulic pump is arranged between the main power source and the transmission control device, the hydraulic pump is connected with an energy accumulator through a one-way valve, the outlet end of the energy accumulator is connected with a brake through a brake control module, and the outlet end of the hydraulic pump is connected with an oil tank through an electric proportional overflow valve; the control unit is connected with a pressure sensor, an oil temperature sensor, a brake control module, a vehicle starting module, a transmission control device and a main power source. According to the system, the functions of low-load starting, braking liquid filling, low-temperature heating and braking energy recovery of the vehicle are achieved, the capacity consumption of an emergency power source in the starting process is reduced, the requirement that the vehicle is started in a low-load state is met, and the vehicle has the better adaptive capacity under the low-temperature working condition in winter.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to a hydraulic brake control system, a control method and a mining dump truck. Background Art

[0002] When starting a mining dump truck, the emergency power source typically drives the vehicle's main power source and the load on the brake pump mounted on the main power source. In cold winter conditions or after a period of use, the emergency power source's performance degrades, making the vehicle difficult to start or impossible to restart. Furthermore, in cold winter conditions, the hydraulic oil temperature is low, resulting in slow brake response. After starting the vehicle, a warm-up device is required to raise the oil temperature to a normal range before use.

[0003] Furthermore, the energy released during vehicle deceleration or braking is primarily generated by the heat generated by the brake pads, making it difficult to recover. Therefore, it is necessary to design a mining dump truck that can start the vehicle at low load, reducing the energy consumption of the emergency power source during startup and making it easier to start the vehicle in low-temperature environments or when the emergency power source performance has degraded. Furthermore, it should have brake system filling functions, low-temperature heating functions, and brake energy recovery, further reducing energy consumption and making the vehicle more adaptable to low-temperature winter conditions. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a hydraulic brake control system, a control method and a mining dump truck with a simple structure and good effects.

[0005] The present invention is implemented through the following technical solution: a hydraulic brake control system, comprising a main power source, the main power source being connected to an emergency power source, the main power source being connected to a brake through a transmission control device, and the brake being connected to a wheel; the transmission control device being further connected to a hydraulic pump, the hydraulic pump being arranged between the main power source and the transmission control device, the hydraulic pump being connected to an accumulator through a one-way valve, the outlet end of the accumulator being connected to the brake through a brake control module, and the outlet end of the hydraulic pump being connected to an oil tank through an electric proportional overflow valve; and also comprising a control unit, the control unit being connected to a pressure sensor, an oil temperature sensor, a brake control module, a vehicle starting module, a transmission control device and the main power source, the oil temperature sensor being used to detect the oil temperature of the oil tank, and the pressure sensor being arranged at the outlet end of the accumulator.

[0006] It is further provided that: the main power source is an engine or an electric motor, and the emergency power source is a battery.

[0007] The transmission control device is any device that can receive and execute control instructions to control power transmission.

[0008] The transmission control device is a gearbox, a transfer case or a clutch.

[0009] The brake control module is any device that can receive and execute control instructions to control brake pressure.

[0010] The brake control module is a brake valve group in the form of an integrated valve group, a brake solenoid valve in the form of an electronically controlled switch, a brake proportional valve in the form of an electronically controlled proportional valve, etc.

[0011] The vehicle starting module is provided with three buttons: close, run and start.

[0012] The electric proportional relief valve is an inverse proportional mode electric proportional relief valve.

[0013] A control method for a hydraulic brake control system includes four modes: standby, oil heating, filling, and energy recovery. The specific methods are as follows: Press the start button of the vehicle start module. When the control unit detects the start signal, it sends a start command to the engine and sets the brake system to standby mode. In standby mode, the opening pressure of the electric proportional relief valve is set to the minimum working pressure value. Press the run button on the vehicle start module. When the control unit detects the run signal, it first checks the oil temperature in the fuel tank through the oil temperature sensor. If the temperature does not meet the requirement, the control unit sets the brake system to oil heating mode. In oil heating mode, the opening pressure of the electric proportional relief valve is set to 105-115% of the accumulator's minimum working pressure. When the temperature meets the requirement, the control unit sets the brake system to charging mode. In charging mode, the accumulator pressure is detected through the pressure sensor. If the pressure does not meet the requirement, the opening pressure of the electric proportional relief valve is set to 90-98% of the accumulator's maximum working pressure. When the pressure meets the requirement, the system enters standby mode. When the control unit detects that the brake control module sends a braking signal to the brake, the control unit will send a braking command to the engine and simultaneously switch the braking system to energy recovery mode. In energy recovery mode, the opening pressure of the electric proportional relief valve is set to 90-98% of the maximum working pressure of the accumulator.

[0014] In standby mode, the opening pressure of the electric proportional relief valve is set to 0 MPa.

[0015] In the oil heating mode, the oil temperature in the oil tank meets the required temperature of 0 degrees. In the oil heating mode, the opening pressure of the electric proportional relief valve slowly increases from the standby state pressure to 110% of the accumulator's minimum working pressure within 1 minute.

[0016] In the charging mode, when the pressure of the accumulator is lower than its minimum working pressure, the control unit sets the opening pressure of the electric proportional relief valve to 95% of the maximum working pressure of the accumulator. When the pressure of the accumulator is not lower than 95% of the maximum working pressure of the accumulator, the control unit 13 will exit the charging mode and enter the standby mode.

[0017] In energy recovery mode, the control unit sets the opening pressure of the electric proportional relief valve to 95% of the maximum working pressure of the accumulator and maintains it.

[0018] A mining dump truck comprises the above-mentioned hydraulic brake control system and is used to execute the control method of the above-mentioned hydraulic brake control system.

[0019] The present invention has the following advantages: the hydraulic brake control system, control method and mining dump truck of the present invention realize the vehicle's low-load starting, brake filling, low-temperature heating and brake energy recovery functions through the hydraulic brake control system, reduce the energy consumption of the emergency power source during the starting process, meet the requirement of starting the vehicle in a low-load state, and collect and recover energy during use, so that the vehicle has better adaptability under low-temperature conditions in winter. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, as part of this disclosure, are intended to provide a further understanding of the disclosure. The exemplary embodiments of the disclosure and their descriptions are intended to explain the disclosure and do not constitute undue limitations thereon. Obviously, the drawings described below are merely examples, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0021] In the attached figure: Figure 1 It is a system principle diagram of the present invention.

[0022] In the figure: 1. Battery, 2. Engine, 3. Transmission control device, 4. Brake, 5. Wheel, 6. Hydraulic pump, 7. Brake control module, 8. Electric proportional relief valve, 9. Check valve, 10. Accumulator, 11. Pressure sensor, 12. Oil temperature sensor, 13. Control unit, 14. Vehicle starting module, 15. Fuel tank.

[0023] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0027] like Figure 1 A hydraulic brake control system is shown, comprising an engine 2, the engine 2 being connected to a battery 1, the engine 2 being connected to a brake 4 via a transmission control device 3, and the brake 4 being connected to a wheel 5; the transmission control device 3 being further connected to a hydraulic pump 6, the hydraulic pump 6 being arranged between the engine 2 and the transmission control device 3, the hydraulic pump 6 being connected to an accumulator 10 via a one-way valve 9, the outlet end of the accumulator 10 being connected to the brake 4 via a brake control module 7, and the outlet end of the hydraulic pump 6 being connected to an oil tank 15 via an electric proportional relief valve 8; and a control unit 13 being further provided, the control unit 13 being connected to a pressure sensor 11, an oil temperature sensor 12, the brake control module 7, a vehicle starting module 17, the transmission control device 3, and the engine 2, the oil temperature sensor 12 being used to detect the oil temperature of the oil tank 15, and the pressure sensor 11 being arranged at the outlet end of the accumulator 10.

[0028] The hydraulic brake control system of the present invention includes a mechanical system consisting of a battery 1, an engine 2, a transmission control device 3, a brake 4 and a wheel 5, and also includes a hydraulic system consisting of a hydraulic pump 6, a one-way valve 9, an accumulator 10, a brake control module 7 and an electric proportional relief valve 8, and an electronic control system consisting of a control unit 13, a pressure sensor 11, an oil temperature sensor 12 and a vehicle starting module 17.

[0029] Specifically, the battery 1 starting state is when the vehicle is starting. In this state, the battery 1 outputs energy to drive the engine 2 and the hydraulic pump 6 connected to the output shaft of the engine 2. The engine 2 running state is when the vehicle is operating normally. In this state, the engine 2 outputs driving force, drives the hydraulic pump 6, and replenishes energy in the battery 1. Meanwhile, the engine 2 outputs driving force to the wheels 5 as needed through the transmission control device 3. A one-way valve 9 is installed between the accumulator 10 and the hydraulic pump 6 to maintain the pressure in the accumulator 10.

[0030] Based on the requirements of the braking system, the accumulator 10 is set to a minimum operating pressure and a maximum operating pressure. The electro-proportional relief valve 8 is connected to the outlet of the hydraulic pump 6. The control unit 13 can further control the output pressure of the hydraulic pump 6 by changing the electrical signal of the electro-proportional relief valve 8 to change its opening pressure.

[0031] The control unit 13 can obtain the vehicle status and determine whether the vehicle is being started by the battery 1, running the engine 2, or in the braking state. The braking state is when the vehicle is braking. In this state, neither the battery 1 nor the engine 2 outputs power, and the vehicle drives the wheels by inertia. The accumulator 10 applies pressure to the brake 4 through the brake control module 7 to prevent the wheels 5 from rotating.

[0032] like Figure 1 A hydraulic brake control system is shown, wherein the transmission control device 3 is a gearbox, transfer case, or clutch. The transmission control device of the present invention refers to any device that can receive and execute control commands to control power transmission, including but not limited to a gearbox, transfer case, or clutch. The hydraulic pump is arranged between the main power source and the transmission control device. The hydraulic pump can be driven by the main power source or the transmission control device. Furthermore, in energy recovery mode, the transmission control device can be used to drive the hydraulic pump to rotate, thereby achieving an energy recovery effect.

[0033] like Figure 1 Specifically, the vehicle start module 14 is provided with three buttons, namely, close, run and start. When a button is pressed, the control unit receives a corresponding signal and the control system enters a corresponding working mode.

[0034] Specifically, the electric proportional relief valve 8 is an inverse proportional mode electric proportional relief valve. In the event of loss of electrical signal, the opening pressure of the proportional relief valve 8 is equal to the maximum working pressure of the accumulator 10, and the hydraulic pump 6 can still provide pressurized oil to the accumulator 10 to ensure the operation of the brake system.

[0035] A control method for a hydraulic brake control system includes four modes: standby, oil heating, filling, and energy recovery. The specific methods are as follows: Standby mode: Press the start button of the vehicle start module 14. When the control unit 13 detects the start signal, the control unit 13 sends a start instruction to the engine 2 and sets the braking system to standby mode. In standby mode, the opening pressure of the electric proportional relief valve 8 is set to the minimum working pressure value.

[0036] In standby mode, the opening pressure of the electric proportional relief valve 8 is set to 0 MPa. At this point, the hydraulic pump 6 operates with minimal driving force and energy consumption, minimizing the load on the battery 1. This makes starting the vehicle easier and reduces the energy consumption of the battery 1 during the startup process. Furthermore, when in standby mode, the engine 2 begins to start, driven by the battery 1. By driving the unloaded hydraulic pump 6, the control unit 13 automatically switches the vehicle starting module 14 to the run position when it detects that the engine 1 has started normally.

[0037] Oil heating mode: When the run button of the vehicle start module 14 is pressed, when the control unit 13 detects the run signal, the control unit 13 first detects the oil temperature of the oil tank 15 through the oil temperature sensor 12. When the oil temperature of the oil tank 15 is lower than the system set temperature, the control unit 13 sets the brake system to the oil heating mode.

[0038] In the oil heating mode, control unit 13 slowly increases the opening pressure of the electric proportional relief valve 8 from 0 MPa to 105-115% of the minimum operating pressure of the accumulator 10 over 1 minute and maintains this setting until the oil temperature reaches the system-set temperature. Control unit 13 then exits the brake system charging mode and returns it to the recharge mode.

[0039] In the oil heating mode, since the opening pressure of the electric proportional relief valve 8 is slightly greater than the minimum working pressure of the accumulator 10, the pressurized oil enters the accumulator 10 through the one-way valve 9, providing the vehicle with the pressurized oil required for braking. At the same time, the excess pressurized oil is heated during the unloading process of the electric proportional relief valve 8 and returns to the oil tank 15, thereby increasing the temperature of the oil tank 15.

[0040] In the oil heating mode, the oil temperature of the oil tank 15 meets the required temperature of 0 degrees. In the oil heating mode, the opening pressure of the electric proportional relief valve 8 is slowly increased from 0 MPa to 110% of the minimum working pressure of the accumulator 10 within 1 minute and this pressure is maintained.

[0041] In the fluid heating mode of the present invention, the control unit gradually increases the opening pressure of the electric proportional relief valve from its minimum to slightly above the accumulator's minimum operating pressure over a period of time, then maintains this pressure. While the accumulator pressure meets the braking system's requirements, the hydraulic pump unloads at this pressure, heating the hydraulic oil through the heat generated by the pressurized oil during the unloading process. When the vehicle's primary power source is operating in fluid heating mode, because the opening pressure of the electric proportional relief valve is slightly greater than the minimum operating pressure, pressurized oil flows through the one-way valve into the accumulator, providing the pressurized oil required for vehicle braking. Excess pressurized oil is heated during the unloading process of the electric proportional relief valve.

[0042] Filling mode: In the charging mode, the control unit 13 detects the pressure of the accumulator 10 through the pressure sensor 11 to adjust the opening pressure of the electric proportional relief valve 8. When the pressure of the accumulator 10 detected by the pressure sensor 11 is lower than its minimum working pressure, the control unit 13 sets the opening pressure of the electric proportional relief valve 8 to 90-98% of the maximum working pressure of the accumulator 10, so that the hydraulic pump 6 provides pressurized oil to the accumulator 10. When the pressure meets the requirement, the control unit 13 will exit the charging mode and the system will enter the standby mode; until the control unit detects that the pressure of the accumulator 10 is lower than its minimum working pressure again.

[0043] In the control method of the present invention, when the control unit 13 detects that the vehicle is in the engine 2 operating state, the control unit 13 sets the brake system to a charging mode to reduce the energy consumption of the hydraulic pump 6, reduce the proportion of high-pressure operating conditions of the hydraulic pump 6, and extend the service life of the hydraulic pump 6. In this mode, the control unit 13 adjusts the opening pressure of the relief valve 8 according to the pressure of the accumulator 10, so that the system consumes the least energy to meet the operating conditions, achieving energy conservation. When the pressure of the accumulator 10 falls below its minimum operating pressure, the control unit 13 sets the opening pressure of the relief valve 8 to slightly below the maximum operating pressure of the accumulator 10, allowing the hydraulic pump 6 to supply pressurized oil to the accumulator 10. When the control unit 13 detects that the pressure of the accumulator 10 is close to the maximum operating pressure of the accumulator 10, the control unit 13 exits the charging mode and enters the standby mode. This mode continues until the control unit 13 detects that the pressure of the accumulator 10 has again fallen below its minimum operating pressure.

[0044] In the charging mode, when the pressure of the accumulator 10 is lower than its minimum working pressure, the control unit 13 sets the opening pressure of the electric proportional relief valve 8 to 95% of the maximum working pressure of the accumulator 10. When the pressure of the accumulator 10 is not lower than 95% of the maximum working pressure of the accumulator, the control unit 13 will exit the charging mode and enter the standby mode.

[0045] Energy recovery mode: When the control unit 13 detects that the brake control module 7 sends a braking signal to the brake 4, the control unit 13 will send a braking command to the engine 2 and simultaneously switch the braking system to the energy recovery mode. In the energy recovery mode, the opening pressure of the electric proportional relief valve 8 is set to 90-98% of the maximum working pressure of the accumulator 10.

[0046] In the energy recovery mode, the control unit 13 sets the opening pressure of the electric proportional relief valve 8 to 95% of the maximum working pressure of the accumulator 10 and maintains it.

[0047] In the control method of the present invention, when the controller detects that the vehicle is in a braking state, the control unit sets the braking system to energy recovery mode. The vehicle's wheels, driven by inertia, rotate, and the wheels, through the transmission control device, drive the hydraulic pump and the main power source. The rotation of the hydraulic pump replenishes pressurized oil in the accumulator. The pressurized oil in the accumulator is output to the brake via the brake control device to prevent wheel rotation. The control unit sets the opening pressure of the relief valve to a level slightly lower than the accumulator's maximum operating pressure and maintains this pressure. Braking energy recovered by the hydraulic pump is stored in the accumulator as pressurized oil, which can continue to provide braking pressure to the vehicle through the brake control module. Simultaneously, the hydraulic pump is operated in maximum energy consumption mode to recover and consume the vehicle's braking energy. Therefore, in this mode, the vehicle's braking energy is converted into high-pressure oil by the hydraulic pump. A portion of this oil is replenished in the accumulator to continuously supply pressurized oil to the braking system, while a portion is released through the relief valve's high-pressure unloading, releasing it as heat.

[0048] In the control method of the present invention, in energy recovery mode, engine 2 ceases to output driving force in response to a braking command, and the vehicle moves under inertia. Brake 4, receiving braking pressure from brake control module 7, generates braking force, preventing wheel 5 from moving. The remaining energy from wheel 5 overcoming the braking force of brake 4 is used to drive hydraulic pump 6 and engine 2 through transmission control device 3. Simultaneously, in brake system energy recovery mode, control unit 13 sets and maintains the opening pressure of electro-proportional relief valve 8 at 95% of the maximum operating pressure of accumulator 10, operating hydraulic pump 6 at maximum energy consumption to recover the remaining energy from wheel 5 overcoming the braking force of brake 4. A portion of the pressurized oil output by hydraulic pump 6 is replenished to accumulator 10 through check valve 9, allowing accumulator 10 to continuously provide braking pressure to brake 4 through brake control module 7. After the pressure in accumulator 10 reaches the opening pressure of electro-proportional relief valve 8, the excess pressurized oil returns to tank 15 through electro-proportional relief valve 8. When the control unit 13 detects that the brake control module 7 no longer sends a brake signal to the brake 4, the control unit 13 will switch the brake system to a corresponding mode according to the operating state of the vehicle.

[0049] The hydraulic brake control system, control method and mining dump truck of the present invention can realize the vehicle starting in a low-load state, reduce the energy consumption of the emergency power source during the starting process, and make the vehicle easier to start in a low-temperature environment or after the performance of the emergency power source decreases; at the same time, it has the brake system's filling function, low-temperature heating function and brake energy recovery function, further reducing energy consumption, so that the vehicle has better adaptability under low-temperature conditions in winter.

[0050] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0051] Furthermore, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are also intended to fall within the scope of protection of the present invention and form different embodiments. For example, in the above embodiments, those skilled in the art will be able to use them in combination based on the known technical solutions and the technical problems to be solved by this application.

[0052] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make slight changes or modifications to equivalent embodiments using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A hydraulic brake control system, characterized in that: It includes a main power source, which is connected to an emergency power source, and the main power source is connected to a brake through a transmission control device, and the brake is connected to a wheel; the transmission control device is also connected to a hydraulic pump, and the hydraulic pump is arranged between the main power source and the transmission control device, and the hydraulic pump is connected to an accumulator through a one-way valve, and the outlet end of the accumulator is connected to the brake through a brake control module, and the outlet end of the hydraulic pump is connected to the oil tank through an electric proportional relief valve; it also includes a control unit, and the control unit is connected to a pressure sensor, an oil temperature sensor, a brake control module, a vehicle starting module, a transmission control device and the main power source, the oil temperature sensor is used to detect the oil temperature of the oil tank, and the pressure sensor is arranged at the outlet end of the accumulator.

2. A hydraulic brake control system according to claim 1, characterized in that: The main power source is an engine or an electric motor, and the emergency power source is a battery or other energy storage device.

3. The hydraulic brake control system according to claim 1, wherein: The transmission control device is any device that can receive and execute control instructions to control power transmission.

4. A hydraulic brake control system according to claim 3, characterized in that: The transmission control device is a gearbox, a transfer case or a clutch.

5. The hydraulic brake control system according to claim 1, characterized in that: The brake control module is any device that can receive and execute control instructions to control brake pressure.

6. A hydraulic brake control system according to claim 5, characterized in that: The brake control module is a brake valve group, a brake solenoid valve or a brake proportional valve.

7. The hydraulic brake control system according to claim 1, characterized in that: The vehicle starting module is provided with three buttons: close, run and start.

8. The hydraulic brake control system according to claim 1, characterized in that: The electric proportional relief valve is an inverse proportional mode electric proportional relief valve.

9. A method for controlling the hydraulic brake control system according to claim 1, characterized in that: It includes four modes: standby, oil heating, filling and energy recovery, as follows: Press the start button of the vehicle start module. When the control unit detects the start signal, it sends a start command to the engine and sets the brake system to standby mode. In standby mode, the opening pressure of the electric proportional relief valve is set to the minimum working pressure value. Press the run button on the vehicle start module. When the control unit detects the run signal, it first checks the oil temperature in the fuel tank through the oil temperature sensor. If the temperature does not meet the requirement, the control unit sets the brake system to oil heating mode. In oil heating mode, the opening pressure of the electric proportional relief valve is set to 105-115% of the accumulator's minimum working pressure. When the temperature meets the requirement, the control unit sets the brake system to charging mode. In charging mode, the accumulator pressure is detected through the pressure sensor. If the pressure does not meet the requirement, the opening pressure of the electric proportional relief valve is set to 90-98% of the accumulator's maximum working pressure. When the pressure meets the requirement, the system enters standby mode. When the control unit detects that the brake control module sends a braking signal to the brake, the control unit will send a braking command to the engine and simultaneously switch the braking system to energy recovery mode. In energy recovery mode, the opening pressure of the electric proportional relief valve is set to 90-98% of the maximum working pressure of the accumulator.

10. The control method of a hydraulic brake control system according to claim 9, characterized in that: In standby mode, the opening pressure of the electric proportional relief valve is set to 0 MPa.

11. The control method of a hydraulic brake control system according to claim 9, characterized in that: In the oil heating mode, the oil temperature in the oil tank meets the required temperature of 0 degrees. In the oil heating mode, the opening pressure of the electric proportional relief valve slowly increases from the standby state pressure to 110% of the accumulator's minimum working pressure within 1 minute.

12. The control method of a hydraulic brake control system according to claim 9, characterized in that: In the charging mode, when the pressure of the accumulator is lower than its minimum working pressure, the control unit sets the opening pressure of the electric proportional relief valve to 95% of the maximum working pressure of the accumulator. When the pressure of the accumulator is not lower than 95% of the maximum working pressure of the accumulator, the control unit will exit the charging mode and enter the standby mode.

13. The control method of a hydraulic brake control system according to claim 9, wherein: In energy recovery mode, the control unit sets the opening pressure of the electric proportional relief valve to 95% of the maximum working pressure of the accumulator and maintains it.

14. A mining dump truck, characterized by: It comprises a hydraulic brake control system as described in any one of claims 1 to 8, and is used to execute a control method of a hydraulic brake control system as described in any one of claims 9 to 13.

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