Energy management method for hybrid power full-hydraulic core drill

Abstract

The invention discloses an energy management method for a hybrid power full-hydraulic core drill. The core drill comprises an engine power system, an energy conversion device, a power battery, a control system and a load. And the control system detects the electric quantity and the load of the power battery, and configures the engine power system, the energy conversion device and the power battery to be switched among a charging mode, a pure electric mode, a pure engine mode and a power enhancement mode. According to the energy management method for the hybrid power full-hydraulic core drill, the electric quantity of a power battery and the size of a load are detected through a control system, and a hybrid power system of the full-hydraulic core drill is configured to enter different operation modes; the common problem that a large horse pulls a trolley in a traditional hydraulic core drilling machine is solved. Energy waste under the light-load working condition is avoided, it is guaranteed that the engine is always in a high-efficiency area under the working condition where an engine power system participates, the fuel oil utilization efficiency is improved, and the operation cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of geological exploration equipment, and specifically to an energy management method for a hybrid full-hydraulic core drill rig. Background Art

[0002] Core drill rigs are mainly used to obtain underground rock formation samples (cores) through drilling, providing direct evidence for geological analysis. Their main applications include the exploration of solid mineral resources; geological surveys for infrastructure projects such as roads, bridges, tunnels, subways, industrial and civil buildings; collecting underground soil samples for environmental testing, assessing geological disasters or pollution conditions; and scientific research on geological structures and rock formation ages. Through core analysis, the underground geological characteristics can be accurately grasped, supporting decisions on resource development, engineering safety, and environmental protection.

[0003] Traditional full-hydraulic core drill rigs mainly operate by directly driving the hydraulic system load with an engine. To cope with unexpected situations during drilling (such as block caving and sticking, pipe sticking due to hole shrinkage, etc., which require high power), usually in the design and selection stage of the drill rig engine, the design concept of "using a big horse to pull a small cart" is followed, and the rated power of the engine is selected to be 1.8 - 2 times the power required for the pure drilling operation, thus reserving a large amount of power to deal with downhole accidents. This results in a large power redundancy during pure drilling operation, leading to high fuel consumption. At the same time, in addition to the normal drill rig operation, there are also a large number of auxiliary operation conditions during drilling operations, such as hole cleaning operations, lowering the fishing tool with the winch and lifting the core with the winch, pumping the inner pipe with the mud pump, flushing the cuttings in the hole with the mud pump, etc. These scenarios usually require relatively small power, usually less than 1 / 3 or even lower than the power required for the pure drill rig operation. Therefore, these conditions are usually referred to as light load conditions. At the same time, the time proportion of these conditions in a day reaches about 50%, and during deep hole operations, the proportion is even larger, resulting in a serious power redundancy of the engine under light load conditions and a relatively serious phenomenon of fuel waste.

[0004] The following table shows the load power requirements of various conditions and the time proportion of various conditions in a day for a 600-meter full-hydraulic core drill rig to complete a 600-meter borehole. It can be seen from this that the maximum power of the engine during pure drilling operation reaches 34KW. According to the conventional drill rig engine selection and design principle, the power of this engine is 66KW, which is much greater than the maximum requirement. In addition, the power under light load conditions is not only much smaller than that under pure drilling operation, but also the duration proportion is relatively large. The phenomenon of using a big horse to pull a small cart and power redundancy directly leads to extremely astonishing diesel waste.

[0005]

[0006] The whole society is emphasizing energy conservation and consumption reduction, as well as high-quality development. Therefore, it is urgent to solve the above technical problems. Summary of the Invention

[0007] In view of the above technical problems, the present invention provides an energy management method for a hybrid full-hydraulic core drill by adding an energy conversion device between the engine and the load oil pump of the full-hydraulic drill. By detecting the battery power of the power battery and the size of the load through the control system, the hybrid power system of the full-hydraulic core drill is configured to enter different operating modes, solving the problem of "using a big horse to pull a small cart" commonly existing in traditional hydraulic core drills, that is, the rated power of the engine is much higher than the actual load demand, avoiding the waste of energy under light load conditions, ensuring that the engine is always in the high-efficiency area under the conditions where the engine power system participates, improving fuel utilization efficiency and reducing operating costs.

[0008] To achieve the above object, the technical solution of the present invention is:

[0009] An energy management method for a hybrid full-hydraulic core drill, the core drill including an engine power system, an energy conversion device, a power battery, a control system and a load; the control system detects the battery power of the power battery and the size of the load, and configures the engine power system, the energy conversion device and the power battery to switch among a charging mode, a pure electric mode, a pure engine mode and a power enhancement mode;

[0010] When the control system detects that the battery power of the power battery is low and the load is a light load, the engine power system operates in the economic fuel consumption range, drives the load and the energy conversion device to charge the power battery, and enters the charging mode;

[0011] When the control system detects that the power battery is fully charged and the load is a light load, the engine power system is turned off, and the power battery supplies power to the energy conversion device to drive the load alone, and enters the pure electric mode;

[0012] When the control system detects that the load matches the economic fuel consumption range of the engine power system, the energy conversion device follows, neither generating electricity nor assisting, and the engine power system drives the load alone, and enters the pure engine mode;

[0013] When the control system detects that the battery power of the power battery is greater than a preset value and the load exceeds the economic fuel consumption range of the engine power system, the power battery supplies power to the energy conversion device, and the energy conversion device and the engine power system drive the load together, and enter the power enhancement mode.

[0014] The energy management method of this hybrid full-hydraulic core drill rig configures a dual-power system of an engine power system and a power battery by the control system, and realizes power coupling through an energy conversion device. When facing different working conditions, it can switch among the charging mode, pure electric mode, pure engine mode and power enhancement mode, ensuring that the engine is always in the high-efficiency area in the working conditions where the engine power system is required to participate, solving the problem of "using a big horse to pull a small cart" commonly existing in traditional hydraulic core drill rigs, improving fuel utilization efficiency, saving fuel, and ultimately achieving the benefits of energy conservation and emission reduction; among them, the energy conversion device plays a role in transmitting kinetic energy in the pure engine mode and belongs to a transmission component; it realizes the function of an electric motor in the pure electric mode and the power enhancement mode; and it realizes the function of a generator in the charging mode.

[0015] Adopting the energy management method of this hybrid full-hydraulic core drill rig, for drill rigs with the same capacity, an engine with a smaller rated power can be selected, reducing the engine cost and eliminating the phenomenon of redundant engine power; avoiding fuel and energy waste under light working conditions. When the power battery has sufficient power under light working conditions, the energy conversion device drives the load alone as an electric motor; when the power is not sufficient, the engine drives the load and at the same time drives the energy conversion device to make it a generator to charge the power battery, and the redundant energy after the engine drives the load is recycled.

[0016] In a further optimized scheme, the state where the power of the power battery is low in the charging mode is lower than 50% of its capacity, and the light load is less than 50% of the rated power of the engine power system;

[0017] The state where the power battery has sufficient power in the pure electric mode is higher than 50% of its capacity, and the light load is less than 50% of the rated power of the engine power system;

[0018] The economic fuel consumption range of the engine power system in the pure engine mode is 60-80% of its rated power;

[0019] The preset value of the power of the power battery in the power enhancement mode is 10%, and the load exceeds the economic fuel consumption range of the engine power system, which is 80-130% of the rated power of the engine power system.

[0020] In a further optimized scheme, in the pure electric mode, the control system closes the engine power system by disconnecting the clutch between the engine power system and the energy conversion device.

[0021] In a further optimized scheme, in the power enhancement mode, when the control system detects that the power of the power battery is consumed to its preset value, the hydraulic system of the load changes the displacement of the hydraulic pump, thereby reducing the load power and matching it with the rated power of the engine power system. This realizes the stability of the engine and avoids damage caused by its long-term overload operation.

[0022] For a further optimized solution, the control system controls the engine power system, the energy conversion device, and the power battery to switch among four working modes through a hybrid system controller. The hybrid system controller realizes the integration, miniaturization, and generalization of control components, which is convenient for manufacturing, installation, and use.

[0023] For a further optimized solution, the power battery is controlled by a battery management system; the control system controls the hybrid system controller and the battery management system through a whole machine controller.

[0024] Intelligent control, operation control, and the operation of the visualization system are realized through the whole machine controller. The whole machine controller integrates the controlled electronic components together, featuring miniaturization and generalization, which is convenient for manufacturing, installation, and use. The whole machine controller is connected to the battery management system to monitor the state of the power battery, control the charging and discharging process of the power battery, ensure the use safety and performance of the power battery, and enable it to operate in a safe and efficient state.

[0025] For a further optimized solution, the engine power system controls the actions of the engine through an engine controller; the hybrid system controller controls the engine controller.

[0026] For a further optimized solution, the engine of the engine power system is connected to and disconnected from the energy conversion device through an electromagnetic clutch; the electromagnetic clutch is controlled by an electromagnetic clutch controller, and the hybrid system controller controls the electromagnetic clutch controller. The electromagnetic clutch realizes the connection or separation between the engine power system and the rotor or its rotating part of the energy conversion device. The electromagnetic clutch has the advantages of simple structure, rapid action, and easy realization of automatic control.

[0027] For a further optimized solution, the power battery is charged by connecting to an external power supply through an OBC charger. The power battery can be charged by an external power supply, which is convenient to use and helps save fuel consumption.

[0028] The present invention has the following technical advantages compared with the prior art:

[0029] 1. By adopting the energy management method of this hybrid full-hydraulic core drill, for drills with the same capacity, an engine with a smaller rated power can be selected, reducing the engine cost, solving the common problem of "using a big horse to pull a small cart" in traditional hydraulic core drills, and saving fuel consumption;

[0030] 2. Under light working conditions, the excess energy of the engine is recovered to charge the power battery, reducing waste, improving the fuel utilization rate, and achieving energy conservation and emission reduction; it can also directly supply power from the power battery to the energy conversion device to drive the load alone as a motor;

[0031] 3. By adding a power battery and an energy conversion device to the engine power system, a dual-power system is formed, with complementary power, achieving the technical effect of charging during light loads and assisting during heavy loads; when facing different working conditions, it can switch among charging mode, pure electric mode, pure engine mode, and power enhancement mode, ensuring that the engine is always in the high-efficiency area in the working conditions where the engine power system participates, and improving fuel utilization efficiency;

[0032] 4. It realizes intelligent control, can optimize power distribution and battery charge and discharge strategies in real time, and reduces the complexity of manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic diagram of the power structure of a hybrid full-hydraulic core drill;

[0034] Figure 2 is an energy flow diagram of the charging mode in the energy management method of the hybrid full-hydraulic core drill of the present invention;

[0035] Figure 3 is an energy flow diagram of the pure electric mode in the energy management method of the hybrid full-hydraulic core drill of the present invention;

[0036] Figure 4 is an energy flow diagram of the pure engine mode in the energy management method of the hybrid full-hydraulic core drill of the present invention;

[0037] Figure 5 is an energy flow diagram of the power enhancement mode in the energy management method of the hybrid full-hydraulic core drill of the present invention;

[0038] Figure 6 is a control block diagram of the core drill in the energy management method of the hybrid full-hydraulic core drill of the present invention;

[0039] In the figure: engine power system 1, control system 2, hybrid system controller HCU, motor driver MCU, whole machine controller VCU, display screen HMI, battery management system BMS, engine controller ECU, electromagnetic clutch controller CCU, thermal management system TMS. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] The present invention will be further described in detail below with reference to the embodiments in the drawings.

[0041] As Figures 1 to 6 shown, it is a schematic diagram related to the specific hybrid system in the energy management method of the hybrid full-hydraulic core drill of the present invention.

[0042] As Figure 1 and Figure 6As shown in the figure, the energy management method for the hybrid full-hydraulic core drill, where the core drill includes an engine power system 1, an energy conversion device, a power battery, a control system 2 and a load; the control system 2 detects the power of the power battery and the size of the load, and configures the engine power system 1, the energy conversion device and the power battery to switch among the charging mode, the pure electric mode, the pure engine mode and the power enhancement mode;

[0043] When the control system 2 detects that the power of the power battery is low and the load belongs to a light load, the engine power system 1 operates in the economic fuel consumption range, drives the load and the energy conversion device to charge the power battery, and enters the charging mode; Figure 2 The energy flow diagram of the charging mode is shown as follows;

[0044] When the control system 2 detects that the power battery is fully charged and the load belongs to a light load, disconnect the coupling, turn off the engine power system 1, and the power battery supplies power to the energy conversion device to drive the load alone, and enter the pure electric mode; Figure 3 The energy flow diagram of the pure electric mode is shown as follows;

[0045] When the control system 2 detects that the load matches the economic fuel consumption range of the engine power system 1, the energy conversion device follows, neither generating electricity nor assisting, and the engine power system 1 drives the load alone, and enters the pure engine mode; Figure 4 The energy flow diagram of the pure engine mode is shown as follows;

[0046] When the control system 2 detects that the power of the power battery is greater than the preset value and the load exceeds the economic fuel consumption range of the engine power system 1, the power battery supplies power to the energy conversion device, and the energy conversion device and the engine power system 1 drive the load together, and enter the power enhancement mode; Figure 5 The energy flow diagram of the power enhancement mode is shown as follows.

[0047] The energy management method for the hybrid full-hydraulic core drill configures a dual-power system of the engine power system 1 and the power battery by the control system 2, and realizes power coupling through the energy conversion device. When facing different working conditions, it realizes switching among the charging mode, the pure electric mode, the pure engine mode and the power enhancement mode, ensuring that the engine is always in the high-efficiency area in the working conditions where the engine power system 1 is required to participate, solving the problem of "big horse pulling a small cart" commonly existing in traditional hydraulic core drills, improving the fuel utilization efficiency, saving fuel, and finally achieving the benefits of energy conservation and emission reduction; among them, the energy conversion device plays a role in transmitting kinetic energy in the pure engine mode and belongs to a transmission component; it realizes the function of an electric motor in the pure electric mode and the power enhancement mode; it realizes the function of a generator in the charging mode.

[0048] With this energy management method for the hybrid full-hydraulic core drill, for drills of the same capacity, an engine with a smaller rated power can be selected, reducing the engine cost; energy waste under light working conditions is avoided. When the power battery has sufficient power under light working conditions, the energy conversion device drives the load alone as a motor; when the power is insufficient, the engine drives the load and at the same time drives the energy conversion device to make it a generator to charge the power battery, and the excess energy after the engine drives the load is recycled.

[0049] In a specific embodiment, the state where the power of the power battery is low in the charging mode is lower than 50% of its capacity, and the light load is less than 50% of the rated power of the engine power system 1;

[0050] In the pure electric mode, the state where the power battery has sufficient power is higher than 50% of its capacity, and the light load is less than 50% of the rated power of the engine power system 1;

[0051] In the pure engine mode, the economic fuel consumption range of the engine power system 1 is 60 - 80% of its rated power;

[0052] In the power enhancement mode, the preset value of the power of the power battery is 10%, and the load exceeds the economic fuel consumption range of the engine power system 1, which is 80 - 130% of the rated power of the engine power system 1. When the control system 2 detects that the power of the power battery is consumed to 10% of its capacity, the hydraulic system of the load changes the displacement of the hydraulic pump, thereby reducing the load power and matching it with the rated power of the engine power system 1. In this way, the stability of the engine is achieved, and damage caused by its long-term overload operation is avoided.

[0053] As Figure 6 shown, in this energy management method for the hybrid full-hydraulic core drill, the core drill further includes a thermal management system TMS, and the cooling pipeline of the thermal management system TMS is connected to the power battery and the load. The thermal management system TMS takes away the heat generated by the load, the engine power system 1 and the power battery during the working process, meets the heat dissipation requirements of each system, and makes it in a stable working state.

[0054] As Figure 6 shown, the control system 2 controls the engine power system 1, the power battery and the energy conversion device to switch among four working modes through the hybrid system controller HCU. The hybrid system controller HCU realizes the integration, miniaturization and generalization of control components, which is convenient for manufacturing, installation and use.

[0055] As Figure 6As shown in the figure, the control system 2 includes a vehicle control unit (VCU). The VCU is respectively connected to a hybrid control unit (HCU), a battery management system (BMS) of a power battery, and a thermal management system (TMS). Through the VCU, intelligent control, operation control, and the operation of a visualization system are realized. The VCU integrates the controlled electronic components, featuring miniaturization and generalization, which is convenient for manufacturing, installation, and use. The VCU is connected to the BMS to monitor the state of the power battery, control the charging and discharging process of the power battery, ensure the safe use and performance of the power battery, and enable it to operate in a safe and efficient state.

[0056] As Figure 6 shown in the figure, the control system 2 includes a motor drive unit (MCU). The VCU is connected to the MCU; the power battery, the MCU, and an energy conversion device are sequentially connected to each other. The MCU controls the rotation speed and direction of the motor by adjusting the output voltage and current to achieve different motion modes, achieving precise control of the motor and protecting the motor. The power battery can use lithium batteries or other types of batteries.

[0057] As Figure 6 shown in the figure, the engine power system 1 includes an engine and an engine control unit (ECU); the clutch is an electromagnetic clutch, which is provided with an electromagnetic clutch control unit (CCU) to control the engagement and disengagement of the electromagnetic clutch; the engine power system 1 integrates the electromagnetic clutch and the CCU. The HCU is respectively connected to the ECU and the CCU. The electromagnetic clutch realizes the connection or separation between the engine power system 1 and the rotor or its rotating part of the energy conversion device. The electromagnetic clutch has the advantages of simple structure, rapid action, and easy implementation of automatic control.

[0058] As Figure 6 shown in the figure, the TMS includes a hydraulic oil cooling system, a battery thermal management system, and a drive thermal management system. The hydraulic oil cooling system reduces the temperature of the hydraulic oil during the working process and maintains it at a stable temperature, avoiding hydraulic system failures caused by too high oil temperature, slowing down the deterioration rate of the hydraulic oil, and extending the service life of hydraulic components and seals. The battery thermal management system reduces and maintains the temperature during the charging and discharging process of the battery to ensure the safe use of the battery. The drive thermal management system reduces the temperature during the use of the drive to ensure stable operation.

[0059] As Figure 6As shown in the figure, the hydraulic system serving as the load includes a hydraulic pump, a hydraulic valve block, a hydraulic motor, a hydraulic cylinder, and the hydraulic pipelines therebetween. The hydraulic pump is used as the power source to drive each executing component to perform relevant actions, such as clamping of drill pipes, drilling, reverse rotation of the power head, and extraction of cores, as well as the movement of the core drill rig.

[0060] As Figure 6 shown in the figure, the engine is a diesel electronically controlled engine. The diesel electronically controlled engine uses diesel power, which is more powerful. The electronically controlled engine uses an electronic control device to control the fuel supply process of the engine, and controls the fuel injection volume according to the various operating conditions of the engine to ensure that the engine has good power performance, economy, and emissions.

[0061] As Figure 6 shown in the figure, in the energy management method of the hybrid full-hydraulic core drill rig, the core drill rig also includes an OBC charger. The whole machine controller VCU is connected to the OBC charger, and the power battery is connected to the external power supply through the OBC charger for charging. The power battery can be charged through the external power supply, which is convenient to use and helps save fuel consumption.

[0062] As Figure 6 shown in the figure, the control system 2 includes a remote control device and a display screen HMI for controlling and displaying the operation of the hybrid power system. The remote control device can operate the operation of the control system 2 at a long distance, which is convenient to use in some complex construction sites and mining areas. The display screen HMI can display the real-time working state of the system and also operate the operation of the system.

[0063] The four working modes in the energy management method of the hybrid full-hydraulic core drill rig are the charging mode, the pure electric mode, the pure engine mode, and the power enhancement mode, which are specifically applied to the following different working conditions:

[0064] In the charging mode, the engine drives the load to work while charging the power battery. When the load is small, the power of the engine will not decrease, and the excess energy of the engine is used to charge the power battery.

[0065] In the pure electric mode, the power battery alone drives the load to work, which is the power mode used to complete auxiliary actions, such as hole cleaning operations, core extraction, inner pipe feeding, and flushing of bottom hole cuttings.

[0066] In the pure engine mode, the pure engine drives the load to work, which is the power mode used to complete the main work, such as some working conditions where the power demand matches the power in the economic range of engine fuel consumption, such as shallow hole drilling and drilling in a complete soft rock formation.

[0067] The power enhancement mode means that the engine and the power battery drive the load to work simultaneously, increasing the power. When the load exceeds the rated power of the engine and the engine lacks power, they work simultaneously. Also, when the drill pipe gets stuck during drilling, they work simultaneously to increase the power to overcome the stuck state.

[0068] As can be seen from the statistical table of power requirements and time proportions under various working conditions of the 600-meter fully hydraulic core drill in the background technology: During the working process of the fully hydraulic core drill, the main working time is drilling, accounting for 50% of the daily working time, and other work accounts for 50% of the daily working time. However, during this period, the engine is still running at full load. For the core drill with a single-engine power system, the energy consumption is dissipated in the form of heat. The hybrid fully hydraulic core drill uses the above energy management method to collect energy through the power battery under this working condition and use the power battery to supply power during the next working cycle to achieve the purpose of saving energy, reducing operating costs, and reducing environmental pollution.

[0069] Using the energy management method of this hybrid fully hydraulic core drill, for drills with the same capacity, an engine with a smaller rated power can be selected, reducing the engine cost, solving the common problem of "using a big horse to pull a small cart" in traditional hydraulic core drills, eliminating the phenomenon of redundant engine power, and saving fuel consumption. For example, the core drill in the statistical table of the background technology originally used a 66Kw engine, and now a combination of a 40Kw engine + a 15Kw energy conversion device can be selected, and the power of the engine is reduced by 39.4%.

[0070] The energy conversion device recovers the excess energy of the engine under light working conditions, reduces waste, improves the fuel utilization rate, and saves energy and reduces emissions. By adding a power battery and an energy conversion device to the engine power system, a dual-power system is formed, with complementary power, achieving the technical effect of charging under light loads and assisting under heavy loads. When facing different working conditions, it can switch between the charging mode, pure electric mode, pure engine mode, and power enhancement mode to ensure that the engine is always in the high-efficiency area during the working conditions participated by the engine power system, improving the fuel utilization efficiency.

[0071] In summary, as described in the specification and illustrated content of the present invention, an actual sample was made and tested multiple times. From the test results, it is proved that the invention can achieve the expected purpose, and its practicability is beyond doubt. The above-mentioned embodiments are only used to conveniently illustrate the content of the invention and are not intended to limit it formally; any person with common general knowledge in the technical field can, without departing from the technical features and similar features proposed by the present invention, make equivalent embodiments with partial changes or modifications using the technical content disclosed by the present invention, and all belong to the protection scope of the present invention.

Claims

1. An energy management method for a hybrid full-hydraulic core drill, characterized in that: The core drill includes an engine power system (1), an energy conversion device, a power battery, a control system (2) and a load; the control system (2) detects the power of the power battery and the magnitude of the load, and configures the engine power system (1), the energy conversion device and the power battery to switch among a charging mode, a pure electric mode, a pure engine mode and a power boost mode; When the control system (2) detects that the power of the power battery is low and the load is a light load, the engine power system (1) operates in the economic fuel consumption range, drives the load and the energy conversion device to charge the power battery, and enters the charging mode; When the control system (2) detects that the power battery is fully charged and the load is a light load, the engine power system (1) is turned off, and the power battery supplies power to the energy conversion device to drive the load alone, and enters the pure electric mode; When the control system (2) detects that the load matches the economic fuel consumption range of the engine power system (1), the energy conversion device follows, neither generating electricity nor providing assistance, and the engine power system (1) drives the load alone, and enters the pure engine mode; When the control system (2) detects that the power of the power battery is greater than a preset value and the load exceeds the economic fuel consumption range of the engine power system (1), the power battery supplies power to the energy conversion device, and the energy conversion device and the engine power system (1) drive the load together, and enter the power boost mode.

2. The energy management method of the hybrid full-hydraulic core drill according to claim 1, characterized in that In the charging mode, the state of low power of the power battery is less than 50% of its capacity, and the light load is less than 50% of the rated power of the engine power system (1); In the pure electric mode, the state of full charge of the power battery is higher than 50% of its capacity, and the light load is less than 50% of the rated power of the engine power system (1); In the pure engine mode, the economic fuel consumption range of the engine power system (1) is 60-80% of its rated power; In the power boost mode, the preset value of the power of the power battery is 10%, and the load exceeding the economic fuel consumption range of the engine power system (1) is 80-130% of the rated power of the engine power system (1).

3. The energy management method of the hybrid full-hydraulic core drill according to claim 1, characterized in that, In the pure electric mode, the control system (2) turns off the engine power system (1) by disconnecting the clutch between the engine power system (1) and the energy conversion device.

4. The energy management method of the hybrid full-hydraulic core drill according to claim 1, characterized in that In the power boost mode, when the control system (2) detects that the power of the power battery is consumed to the preset value of its capacity, the hydraulic system of the load changes the displacement of the hydraulic pump, thereby reducing the load power and matching it with the rated power of the engine power system (1).

5. The energy management method of the hybrid full hydraulic core drill according to claim 1, characterized in that, The control system (2) controls the engine power system (1), the energy conversion device and the power battery to switch among the four working modes through a hybrid system controller (HCU).

6. The energy management method of the hybrid full hydraulic core drill according to claim 5, characterized in that The power battery is controlled by a battery management system (BMS); the control system (2) controls the hybrid system controller (HCU) and the battery management system (BMS) through a whole machine controller (VCU).

7. The energy management method of the hybrid full hydraulic core drill according to claim 5, characterized in that, The engine power system (1) controls the operation of the engine through an engine controller (ECU); the hybrid system controller (HCU) controls the engine controller (ECU).

8. The energy management method of the hybrid full-hydraulic core drill according to claim 5, characterized in that The engine of the engine power system (1) is connected to and disconnected from the energy conversion device through an electromagnetic clutch; the electromagnetic clutch is controlled by an electromagnetic clutch controller (CCU), and the hybrid system controller (HCU) controls the electromagnetic clutch controller (CCU).

9. The energy management method of the hybrid full-hydraulic core drill according to claim 1, characterized in that, The power battery is charged by connecting to an external power source through an OBC charger.

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