Hybrid power transmission system of deep well drilling rig and control method of hybrid power transmission system

Abstract

The invention discloses a deep well drilling rig hybrid power transmission system and a control method thereof. The deep well drilling rig hybrid power transmission system comprises a transfer case, an engine, a motor, a battery pack, an engine controller, a motor controller and a complete machine controller. The complete machine controller is used for sending control instructions to the engine controller and the motor controller according to the load working condition and a preset control strategy. The engine controller and the motor controller respectively adjust the driving modes of the engine and the motor according to the received control instructions; the engine can drive the motor to idle through the transfer case to charge the battery pack. Cooperative cooperation between the engine and the motor can be effectively achieved, and the motor is used for driving under the power utilization condition; under the condition that no electricity is used, the engine and the motor work in a coordinated mode, the engine can work in a high-efficiency interval, a low-load area and an ultra-large-load area are avoided as much as possible, and the advantages of being capable of reducing cost, saving energy consumption and the like are achieved.

Description

Technical Field

[0001] The present invention relates to a hybrid power transmission system for a deep well drilling rig and a control method thereof, belonging to the technical field of engineering machinery. Background Art

[0002] Deep-well drilling rigs are widely used in the drilling and development of water wells, coalbed methane wells, mine ventilation holes, geothermal wells, and emergency rescue wells. Existing deep-well drilling rigs mostly use traditional internal combustion engines as their core power components, powered by gasoline and diesel. Another option is to use electric motors as their core power components, using a power supply to provide energy for the motor's output.

[0003] To reduce fuel consumption and save operating costs for deep-well drilling rigs, dual-fuel power solutions are currently available. These two core components, the engine and the electric motor, operate independently, using the electric motor when electricity is available and the engine when power is unavailable, such as in the field. While this dual-fuel solution can reduce fuel consumption to a certain extent, it places significant demands on the overall rig layout. This often results in the use of an external motor, resulting in poor integration and inflexible transitions. Furthermore, it fails to fully utilize the advantages of both the electric motor and the engine, hindering maximum efficiency. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a hybrid power transmission system for a deep well drilling rig and a control method thereof, which maximizes benefits by fully utilizing the advantages of the motor and the engine and adjusting the driving modes of the motor and the engine according to the load conditions.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions: In a first aspect, the present invention provides a hybrid power transmission system for a deep well drilling rig, comprising: A transfer case, the output end of which is transmission-connected to a hydraulic pump; An engine, an output end of which is connected to a first input end of a transfer case via a clutch; an electric motor, an output end of which is connected to the second input end of the transfer case; a battery pack, electrically connected to the motor via a motor controller and a battery management unit, for providing a power source for the motor; an engine controller, electrically connected to the engine; The whole machine controller is electrically connected to the engine controller and the motor controller; Among them, the whole machine controller is used to send control instructions to the engine controller and motor controller respectively according to the load conditions and pre-set control strategies; the engine controller and motor controller respectively adjust the driving modes of the engine and motor according to the received control instructions; the engine can drive the motor through the transfer case to charge the battery pack.

[0006] Furthermore, the deep well drilling rig hybrid power transmission system also includes an external power supply, which is connected to the motor controller through a rectifier to provide a power source for the motor.

[0007] Furthermore, the driving modes include: Pure electric mode: The engine does not work, the clutch is disengaged, and power is supplied to the electric motor through the battery pack; Hybrid mode: The engine and electric motor work simultaneously, the clutch is engaged, and the electric motor controller adjusts the electric motor speed to be consistent with the engine speed, so that the engine and electric motor torques are coupled; Plug-in mode: The engine is not running, the clutch is disengaged, and power is supplied to the electric motor through an external power supply.

[0008] Furthermore, the control strategy includes: When the deep well drilling rig is in a preset heavy load condition, the engine and the electric motor work simultaneously, and the electric motor is used to supplement the torque to meet the heavy load condition; When the deep well drilling rig is in a preset medium or large load condition, the engine is working, the electric motor is not working, and part of the driving torque of the engine that exceeds the load requirement is used to charge the battery pack; When the deep well drilling rig is in a preset medium load condition, if the battery pack is in a preset power-deficient state, the engine outputs the preset maximum torque in the high-efficiency zone, and part of the engine's driving torque exceeding the load requirement is used to charge the battery pack; if the battery pack is in a preset full-charge state, the engine and the electric motor work simultaneously, and the electric motor idles; When the deep well drilling rig is in a preset light load condition, if the battery pack is in a preset fully charged state, the engine does not work and the electric motor works; if the battery pack is in a preset power-deficient state, the electric motor works, the engine works and outputs a preset minimum torque in the high-efficiency zone, and part of the engine's driving torque that exceeds the load requirement is used to charge the battery pack.

[0009] Furthermore, the transfer case has four output ends; the four output ends are respectively connected to the four hydraulic pumps.

[0010] Furthermore, the engine and the clutch are connected via a highly elastic coupling to transmit torque.

[0011] Furthermore, the clutch, transfer case and motor are all fixed to the motor bracket.

[0012] In a second aspect, the present invention provides a control method for a hybrid power transmission system of a deep well drilling rig, applicable to any of the above hybrid power transmission systems of the deep well drilling rig, comprising: Determine the current load condition of the deep well drilling rig; The driving modes of the engine and the electric motor are adjusted according to the load conditions.

[0013] Furthermore, the load conditions are respectively a heavy load condition, a medium-heavy load condition, a medium load condition and a light load condition according to the driving torque required by the load, from large to small.

[0014] Furthermore, adjusting the driving modes of the engine and the motor according to the load conditions includes: Under heavy load conditions, the engine and the electric motor work simultaneously, and the electric motor is used to supplement the torque to meet the heavy load conditions; Under medium and large load conditions, the engine is working, the electric motor is not working, and part of the engine's driving torque exceeding the load requirement is used to charge the battery pack; Under medium load conditions, if the battery pack is in a preset power-deficient state, the engine outputs a preset high-efficiency zone maximum torque, and part of the engine's driving torque that exceeds the load requirement is used to charge the battery pack; if the battery pack is in a preset full-charge state, the engine and the electric motor work simultaneously, and the electric motor idles; Under light load conditions, if the battery pack is in a preset fully charged state, the engine does not work and the electric motor works; if the battery pack is in a preset power-deficient state, the electric motor works, the engine works and outputs the preset minimum torque in the high-efficiency zone, and part of the engine's driving torque that exceeds the load requirement is used to charge the battery pack.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a hybrid power transmission system for a deep well drilling rig and a control method thereof, wherein the whole machine controller sends control instructions to the engine controller and the motor controller respectively according to a preset control strategy; the engine controller and the motor controller respectively adjust the drive modes of the engine and the motor according to the received control instructions, thereby enabling the adjustment of the drive modes of the motor and the engine according to power usage conditions, thereby effectively saving costs.

[0016] The present invention also determines the current load condition of the deep well drilling rig and adjusts the driving mode of the engine and the electric motor according to the load condition, thereby maximizing the coordinated operation of the electric motor and the engine, making full use of the torque output of the electric motor and the engine, and improving energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a working principle diagram of a hybrid power transmission system for a deep well drilling rig according to an embodiment of the present invention; Figure 2 This is a schematic structural diagram of a hybrid power transmission system for a deep well drilling rig according to an embodiment of the present invention; Figure 3A schematic diagram of the driving mode switching principle according to an embodiment of the present invention; Figure 4 Schematic diagram of the engine high efficiency range principle according to an embodiment of the present invention.

[0018] In the figure: 1. Transfer case; 2. Hydraulic pump; 3. Clutch; 4. High-elastic coupling; 5. Engine; 6. Engine bracket; 7. Motor bracket; 8. Motor. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0021] 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 in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances. Example

[0022] See also Figure 1 and Figure 2 This embodiment introduces a hybrid power transmission system for a deep well drilling rig, including a transfer case 1, an engine 5, an electric motor 8, a battery pack, an engine controller, a motor controller and a whole machine controller.

[0023] The output end of the transfer case 1 is connected to the hydraulic pump 2 through transmission; the output end of the engine 5 is connected to the first input end of the transfer case 1 through transmission via the clutch 3; the output end of the motor 8 is connected to the second input end of the transfer case 1; the battery pack is electrically connected to the motor through the motor controller and the battery management unit (battery BMS), and is used to provide a power source for the motor 8; the engine controller is electrically connected to the engine 5; the whole machine controller is electrically connected to the engine controller and the motor controller; wherein the whole machine controller is used to send control instructions to the engine controller and the motor controller respectively according to the load condition and the preset control strategy; the engine controller and the motor controller respectively adjust the drive mode of the engine 5 and the motor 8 according to the received control instructions.

[0024] The electric motor 8 is a permanent magnet synchronous motor that can both consume electricity to drive the hydraulic pump and be driven by the engine to generate electricity, which is stored in the battery pack. A rectifier and charging device are also provided for the electric motor 8, enabling both towing and battery charging.

[0025] In the above scheme, a hybrid power system of an engine and an electric motor is adopted, and the driving modes of the electric motor and the engine can be adjusted according to the power consumption conditions, which can effectively save costs.

[0026] In addition, the hybrid powertrain system for deep-well drilling rigs in this embodiment is equipped with an external power supply, which is connected to the motor controller via a rectifier. The rectifier converts external AC power into the DC power required by motor 8, which directly drives motor 8. A contactor is installed between motor 8 and the motor controller. When the battery pack cannot be charged, the contactor is disconnected to protect the motor controller.

[0027] Specifically, see Figure 3The drive modes include pure electric mode, hybrid mode, and plug-in mode. In pure electric mode, the engine 5 is inoperative, the clutch 3 is disengaged, and power is supplied to the electric motor 8 via the battery pack. The electric motor 8 drives four hydraulic pumps 2 through the transfer case 1 to power the vehicle's hydraulic system. The motor controller communicates with the engine controller in a speed-following mode, constantly adjusting the speed of the electric motor 8 to match that of the engine 5, resulting in torque coupling between the two. The engine controller receives commands from the vehicle controller and adjusts the output torque accordingly. In hybrid mode, the engine 5 and electric motor 8 operate simultaneously, the clutch 3 is engaged, and the motor controller constantly adjusts the speed of the electric motor 8 to match that of the engine 5, resulting in torque coupling between the two. In plug-in mode, the engine 5 is inoperative, the clutch 3 is disengaged, and power is supplied to the electric motor 8 via an external power supply. The electric motor 8 drives four hydraulic pumps 2 through the transfer case 1 to power the vehicle's hydraulic system. In pure electric and plug-in modes, the engine 5 is not required, and only electric drive is used. In hybrid mode, the engine 5 is the primary drive, supplemented by the electric motor. No external power supply is required, making it suitable for use in environments with limited access to electricity. This control method can realize the oil-electric dual drive mode of deep well drilling rigs.

[0028] Furthermore, in this embodiment, the control strategy includes: When the deep well drilling rig is in a preset high load condition, the engine 5 and the motor 8 work simultaneously, and the motor 8 is used to supplement the torque to meet the high load condition; When the deep well drilling rig is in a preset medium or heavy load condition, the engine 5 is working, the electric motor 8 is not working, and part of the driving torque of the engine 5 that exceeds the load requirement is used to charge the battery pack.

[0029] When the deep well drilling rig is in a preset medium load condition, if the battery pack is in a preset power-deficient state, the engine 5 outputs the preset maximum torque in the high-efficiency zone, and part of the driving torque of the engine 5 that exceeds the load requirement is used to charge the battery pack; if the battery pack is in a preset full-charge state, the engine 5 and the motor 8 work simultaneously, and the motor 8 idles.

[0030] When the deep well drilling rig is in a preset light load condition, if the battery pack is in a preset fully charged state, the engine 5 does not work and the electric motor 8 works; if the battery pack is in a preset power-deficient state, the electric motor 8 works, the engine 5 works and outputs a preset minimum torque in the high-efficiency zone, and part of the driving torque of the engine 5 that exceeds the load requirement is used to charge the battery pack.

[0031] Furthermore, the control strategy of the vehicle controller is as follows Figure 4 As shown: Region A: This region represents the entire machine being under a heavy load condition, with the engine 5 outputting the maximum driving torque and the motor 8 supplementing the output of the remaining insufficient torque, and the engine 5 and the motor working simultaneously.

[0032] Region B: This region represents the machine being in medium to heavy load conditions. The maximum driving torque outputted by the single engine 5 is sufficient. At this time, if the battery pack exceeds the demand, the battery will be actively charged.

[0033] Region C: This region represents the vehicle under medium load conditions. If the battery pack is low on power, the engine 5 outputs the maximum torque in the high-efficiency range, and the excess torque is used to actively charge the battery. If the battery pack is fully charged, the required torque of the vehicle is provided by the engine 5, and the motor 8 is idling.

[0034] Region D: This region represents the vehicle under light load conditions. If the battery pack is fully charged, the required torque of the vehicle is provided by the drive motor. If the battery pack is low on power, the engine 5 outputs the minimum torque in the high-efficiency zone, and the excess torque is used to actively charge the battery.

[0035] Among them, the battery status is judged by the vehicle controller, and the threshold is set manually. If it is below the minimum threshold, it is judged to be in a power-deficient state, and if it is above the maximum threshold, it is judged to be in a fully charged state.

[0036] The operating conditions of deep-well drilling rigs are characterized by strong periodicity, large load fluctuations, and sudden load changes. In order to avoid abnormal engine speed drop and stalling under sudden high-load conditions, traditional single-diesel engine-driven deep-well drilling rigs generally need to be selected according to the maximum load. A larger power engine will be selected, resulting in increased overall machine cost, large engine load fluctuations, and increased fuel consumption.

[0037] This deep well drilling rig hybrid power system is designed for the construction conditions of deep well drilling rigs. Short-term peak high loads are coupled by the power supply of the electric motor 8 and the torque of the engine 5, which reduces the load on the engine 5. Under light load conditions, the engine 5 drives the electric motor 8 to idlingly generate electricity, increasing the load on the engine 5, so that the engine 5 operates in a high-efficiency range, avoiding low-load areas and ultra-large load areas as much as possible, which can effectively reduce costs and save energy.

[0038] It should be noted that the transfer case 1 has two input terminals and four output terminals, specifically, two-side input terminals and four output terminals in the middle. The four output terminals are connected to four hydraulic pumps 2 respectively.

[0039] The engine 5 and clutch 3 are connected by a highly elastic coupling 4 to transmit torque. This coupling 4 serves as a mounting compensation and shock absorber, protecting the entire transmission shaft system. This completely eliminates the rigid connection between the engine 5, clutch 3, transfer case 1, electric motor 8, and hydraulic pump 2, which are subject to significant vibration and impact, effectively protecting the core transmission components.

[0040] The clutch 3, transfer case 1, and motor 8 are all fixed to the motor bracket 7. The clutch 3 and transfer case 1 are rigidly fixed together via splines to transmit torque. The transfer case 1 and motor 8 are rigidly fixed together via splines to transmit torque. The engine 5, clutch 3, transfer case 1, and motor 8 are coaxially arranged. The clutch 3, transfer case 1, and motor 8 are rigidly fixed, coaxially connected in series, and share the motor bracket 7.

[0041] Clutch 3 is a normally open hydraulic clutch. When no hydraulic power is supplied, it is normally open, disconnecting the transmission from engine 5 to motor 8. When hydraulic power is supplied, it is engaged, coaxially driving the engine 5 and motor 8. The hydraulic power source for clutch 3 is provided by the hydraulic pump at the secondary power take-off port of engine 5. When engine 5 is operating, the hydraulic power source automatically reaches the operating pressure, causing clutch 3 to engage. When engine 5 stops, the hydraulic power source to clutch 3 is lost, causing clutch 3 to disengage. This effectively prevents improper operation that could cause motor 8 to operate and drive the flywheel of engine 5, potentially damaging engine 5.

[0042] The four hydraulic pumps 2 are placed opposite to each other and are suspended on the clutch 3 and the electric motor 8, which does not occupy the space of the entire machine, can greatly shorten the axial length of the power system, and is convenient for layout.

[0043] In summary, the present invention provides a rationally designed hybrid powertrain system that effectively achieves synergistic cooperation between the internal combustion engine and the electric motor. When power is available, the electric motor 8 is used for driving, reducing overall noise and power consumption. When power is unavailable, the engine 5 and electric motor 8 operate in coordination, with the battery pack providing power for short periods of light load operation, such as short-distance transfers. Under medium and high load conditions, the engine drives the vehicle, with excess power generated by the generator and stored in the battery pack. Under high loads, the battery pack supplies power to the electric motor and engine for coupled driving, maximizing torque output. Example

[0044] This embodiment provides a control method for a hybrid power transmission system of a deep well drilling rig, which is applicable to a hybrid power transmission system provided in the above embodiment 1, including: S100: Determine the current load condition of the deep well drilling rig.

[0045] Specifically, the load conditions are respectively a heavy load condition, a medium-heavy load condition, a medium load condition and a light load condition according to the required driving torque of the load, from large to small.

[0046] S200 , adjusting the driving modes of the engine 5 and the electric motor 8 according to the load conditions.

[0047] Specifically, under heavy load conditions, the engine 5 and the motor 8 work simultaneously, and the motor 8 is used to supplement the torque to meet the heavy load conditions; Under medium and heavy load conditions, the engine 5 is in operation, the electric motor 8 is in operation, and part of the driving torque of the engine 5 that exceeds the load requirement is used to charge the battery pack.

[0048] Under medium load conditions, if the battery pack is in a preset power-deficient state, the engine 5 outputs the preset maximum torque in the high-efficiency zone, and part of the driving torque of the engine 5 that exceeds the load requirement is used to charge the battery pack; if the battery pack is in a preset full-charge state, the engine 5 and the motor 8 work simultaneously, and the motor 8 idles.

[0049] Under light load conditions, if the battery pack is in a preset fully charged state, the engine 5 does not work and the electric motor 8 works; if the battery pack is in a preset power-deficient state, the electric motor 8 works, the engine 5 works and outputs a preset minimum torque in the high-efficiency zone, and part of the driving torque of the engine 5 that exceeds the load requirement is used to charge the battery pack.

[0050] Example 3: This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps of any one of the methods described in Example 2 are implemented.

[0051] Embodiment 4: This embodiment provides a computer device, including: Memory, used to store computer programs / instructions; A processor, configured to execute the computer program / instructions to implement the steps of any one of the methods described in Example 2.

[0052] Example 5. This embodiment provides a computer program product, including a computer program / instruction, which implements the steps of any one of the methods described in Example 2 when executed by a processor.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

[0054] Those skilled in the art will appreciate that embodiments of the present disclosure may be provided as methods, systems, or computer program products. Thus, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROMs, optical storage, etc.) containing computer-usable program code.

[0055] The present disclosure is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present disclosure. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0056] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0057] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure and are not intended to limit its scope of protection. Although the present disclosure has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading the present disclosure, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the scope of protection of the disclosed claims to be approved.

Claims

1. A hybrid power transmission system for a deep well drilling rig, characterized in that: include: A transfer case, the output end of which is transmission-connected to a hydraulic pump; An engine, an output end of which is connected to a first input end of a transfer case via a clutch; an electric motor, an output end of which is connected to the second input end of the transfer case; a battery pack, electrically connected to the motor via a motor controller and a battery management unit, for providing a power source for the motor; an engine controller electrically connected to the engine; The whole machine controller is electrically connected to the engine controller and the motor controller; Among them, the whole machine controller is used to send control instructions to the engine controller and motor controller respectively according to the load conditions and pre-set control strategies; the engine controller and motor controller respectively adjust the driving modes of the engine and motor according to the received control instructions; the engine can drive the motor through the transfer case to charge the battery pack.

2. The hybrid power transmission system for deep well drilling rig according to claim 1, characterized in that: The deep well drilling rig hybrid power transmission system further includes an external power supply, which is connected to the motor controller via a rectifier and is used to provide a power source for the motor.

3. The hybrid power transmission system for deep well drilling rig according to claim 2, characterized in that: The driving modes include: Pure electric mode: the engine does not work, the clutch is disengaged, and power is supplied to the electric motor through the battery pack; Hybrid mode: The engine and electric motor work simultaneously, the clutch is engaged, and the electric motor controller adjusts the electric motor speed to be consistent with the engine speed, so that the engine and electric motor torques are coupled; Plug-in mode: The engine is not running, the clutch is disengaged, and power is supplied to the electric motor through an external power supply.

4. The hybrid power transmission system for deep well drilling rig according to claim 1, characterized in that: The control strategy includes: When the deep well drilling rig is in a preset heavy load condition, the engine and the electric motor work simultaneously, and the electric motor is used to supplement the torque to meet the heavy load condition; When the deep well drilling rig is in a preset medium or large load condition, the engine is working, the electric motor is not working, and part of the driving torque of the engine that exceeds the load requirement is used to charge the battery pack; When the deep well drilling rig is in a preset medium load condition, if the battery pack is in a preset power-deficient state, the engine outputs the preset maximum torque in the high-efficiency zone, and part of the engine's driving torque exceeding the load requirement is used to charge the battery pack; if the battery pack is in a preset full-charge state, the engine and the electric motor work simultaneously, and the electric motor idles; When the deep well drilling rig is in a preset light load condition, if the battery pack is in a preset fully charged state, the engine does not work and the electric motor works; if the battery pack is in a preset power-deficient state, the electric motor works, the engine works and outputs a preset minimum torque in the high-efficiency zone, and part of the engine's driving torque that exceeds the load requirement is used to charge the battery pack.

5. The hybrid power transmission system for deep well drilling rig according to claim 1, characterized in that: The transfer case has four output ends; the four output ends are respectively connected to the four hydraulic pumps.

6. The hybrid power transmission system for deep well drilling rig according to claim 1, characterized in that: The engine and the clutch are connected via a highly elastic coupling to transmit torque.

7. The hybrid power transmission system for deep well drilling rig according to claim 1, characterized in that: The clutch, transfer case and motor are all fixed to the motor bracket.

8. A control method for a hybrid power transmission system of a deep well drilling rig, characterized in that: A hybrid power transmission system for a deep well drilling rig according to any one of claims 1 to 7, comprising: Determine the current load condition of the deep well drilling rig; The driving modes of the engine and the electric motor are adjusted according to the load conditions.

9. The control method of a hybrid power transmission system according to claim 8, characterized in that: The load conditions are large load condition, medium-large load condition, medium load condition and light load condition according to the required driving torque of the load, from large to small.

10. The control method of a hybrid power transmission system according to claim 9, characterized in that: The adjusting the driving modes of the engine and the electric motor according to the load conditions includes: Under heavy load conditions, the engine and the electric motor work simultaneously, and the electric motor is used to supplement the torque to meet the heavy load conditions; Under medium and large load conditions, the engine is working, the electric motor is not working, and part of the engine's driving torque exceeding the load requirement is used to charge the battery pack; Under medium load conditions, if the battery pack is in a preset power-deficient state, the engine outputs a preset high-efficiency zone maximum torque, and part of the engine's driving torque that exceeds the load requirement is used to charge the battery pack; if the battery pack is in a preset full-charge state, the engine and the electric motor work simultaneously, and the electric motor idles; Under light load conditions, if the battery pack is in a preset fully charged state, the engine does not work and the electric motor works; if the battery pack is in a preset power-deficient state, the electric motor works, the engine works and outputs the preset minimum torque in the high-efficiency zone, and part of the engine's driving torque that exceeds the load requirement is used to charge the battery pack.

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