Tire type transporter hybrid power driving system and oil-to-electricity transformation method

Abstract

The invention relates to the technical field of engineering machinery electric transformation, in particular to a rubber-tyred transporter hybrid power driving system and an oil-to-electricity transformation method. Oil-to-electricity transformation is carried out on an existing rubber-tyred transporter, hybrid power system design, hydraulic displacement multi-working-condition hierarchical control, winch variable-frequency driving and four-stage braking cooperative control are combined, the working efficiency and economical efficiency of equipment can be greatly improved, and green upgrading of old equipment is achieved; the generator mute technology is combined with a driving system cabin sound insulation measure, noise pollution of equipment field operation can be greatly reduced, physical and psychological health and emotion stability of operators are facilitated, and the field civilized construction level is improved; the device has economical efficiency, environmental protection performance and safety, can save equipment operation and maintenance cost and reduce carbon emission through oil-to-electricity transformation, is high in equipment operation stability, can greatly reduce the misoperation rate, and is convenient to operate integrally, high in applicability and easy to popularize and use in a large range.

Description

Technical Field

[0001] The present invention relates to the technical field of electrification transformation of engineering machinery, and in particular to a hybrid power drive system for a wheeled transporter and a method for converting it from oil to electricity. Background Art

[0002] With the development of industry, wheeled transporters have been widely used in logistics, ports, construction sites and other fields. Traditional wheeled transporters use dual diesel engines (each 273kW) to drive the hydraulic pump station and winch system, which has the following defects: High energy consumption and low efficiency: The diesel engine has redundant power, and fuel consumption under heavy-load conditions reaches 110L / time, while fuel economy is poor during idling and high-speed periods; severe noise pollution: The operating noise of the open diesel engine reaches 80-100 decibels, which does not meet the night construction standards (≤55 decibels); high maintenance costs: Imported hydraulic components (such as Sauer motors) have a long procurement cycle and a high risk of hydraulic oil leakage; lack of energy recovery: Energy is wasted during braking and lowering conditions and cannot be recycled.

[0003] Existing technologies for electrifying wheeled transporters typically use a single battery or generator for power supply, which has limited endurance, high battery costs, and short lifespans. It is difficult to balance heavy-load power requirements with light-load energy efficiency, and the braking safety and energy recovery mechanisms are imperfect. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in view of the shortcomings of the existing technology, a hybrid power drive system for a tire-type transporter and an oil-to-electric conversion method are provided, which can greatly improve the working efficiency and economy of the tire-type transporter drive system, and reduce its energy consumption and noise pollution, so as to realize efficient, energy-saving and environmentally friendly operation of the tire-type transporter.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: 1. A hybrid drive system for a wheeled transporter The present invention provides a hybrid power drive system for a wheeled transporter, which mainly includes: a power system, a hydraulic system, a hoisting system, and an electrical control system. The power system is equipped with a silent generator set (400kW) and a three-phase asynchronous motor (132kW), and is configured with a bidirectional DC / DC converter (input AC380V / output DC600V). The power output end of the silent generator set is connected to the electronically controlled variable hydraulic pump station of the wheeled transporter, and the power output end of the silent generator set is connected to the power input end of the three-phase asynchronous motor and an energy storage battery pack respectively. The hydraulic system is provided with an electronically controlled variable hydraulic pump station, which is connected to the power output end of the three-phase asynchronous motor and adopts a multi-working-condition displacement graded control strategy; The hoisting system is equipped with a YVF2-250M-6-37kW variable frequency drive motor. The output end of the variable frequency drive motor is connected to the drum reducer of the hoisting system through a coupling. A push rod brake is installed at the coupling position to cooperate with the motor braking, reducer braking and disc brake braking to realize the four-level braking control strategy of the hoisting system. The power system, hydraulic system, and hoisting system are all electrically connected to the electrical control system, and the cabin of the hybrid power drive system adopts a sound insulation layout.

[0006] Preferably, when the power system is in pure electric mode, the generator set and the engine are not working, and the power battery pack provides electrical energy to the three-phase asynchronous motor; when the power system is in hybrid mode, the engine drives the generator set to generate electricity and supplies electrical energy to the three-phase asynchronous motor, and the excess electrical energy is stored in the power battery pack.

[0007] Preferably, the multi-operating-condition displacement graded control strategy includes: S1, working condition identification: The electrical control system identifies the working condition of the transporter in real time based on the current working status parameters of the transporter; S2, multi-condition hydraulic system displacement control: adjusts the working displacement of the electronically controlled variable hydraulic pump in real time according to the current working condition of the transporter; S3, multi-operating-condition power system energy graded control: Based on the current operating condition of the transporter, the power system switches between pure electric mode and hybrid mode in real time, preliminarily allocating the output power ratio between the generator set and the power battery pack; S4, battery power management and control: During idling conditions, the battery power is monitored and managed in real time based on the voltage, current, and temperature parameters of the power battery pack. By further adjusting the output power ratio of the generator set and the power battery pack, the battery is prevented from being overcharged or over-discharged.

[0008] Preferably, the current working state parameters of the transporter include: load weight, speed of the generator set, three-phase asynchronous motor and variable frequency drive motor, displacement of the electronically controlled variable hydraulic pump, and battery capacity of the power battery pack; The working conditions of the transport machine include: no-load working conditions and heavy-load working conditions; the heavy-load working conditions specifically include: starting and low-speed transport working conditions, acceleration and medium- and high-speed transport working conditions, idling working conditions, and braking working conditions.

[0009] Preferably, the multi-mode hydraulic system displacement control specifically includes: Under no-load conditions, adjust the working displacement of the electronically controlled variable hydraulic pump to 70~90ml / r to increase the working pressure of the hydraulic system; Under heavy load conditions, adjust the working displacement of the electronically controlled variable hydraulic pump to 20~40ml / r to reduce the working pressure of the hydraulic system.

[0010] Preferably, the energy graded control of the multi-operating-mode power system specifically includes: During starting and low-speed transport, the machine switches to pure electric mode, using only the power battery pack to power the three-phase asynchronous motor. The generator set does not work at this time, enabling smooth starting and low-speed operation of the transporter while reducing energy consumption and emissions. During acceleration and medium-to-high-speed handling conditions, the vehicle switches to hybrid mode, allowing the power battery pack and generator set to simultaneously power the three-phase asynchronous motor to meet handling power requirements. Preferably, the battery power management control specifically includes: During idling conditions, when the battery charge is not lower than the preset threshold, the generator set will shut down and only the power battery pack will power the three-phase asynchronous motor; when the battery charge is lower than the preset threshold, the generator set will start, so that the generator set will power the three-phase asynchronous motor while charging the power battery pack.

[0011] Preferably, the four-level braking control strategy is specifically as follows: after entering the braking state, the winch system's disc brake is first used for braking; when the transport speed is lower than a preset speed value of one, the winch system's speed reducer is simultaneously used for braking; when the transport speed is lower than a preset speed value of two, the additional push rod brake is further used for braking; when the transport speed is lower than a preset speed value of three, the drive motor is used to load reverse torque for final braking; Among them, the preset speed value 1>preset speed value 2>preset speed value 3.

[0012] Preferably, the cabin of the hybrid drive system adopts a sound insulation layout scheme, specifically including: affixing a sound-absorbing cotton insulation layer on the inner wall of the cabin, covering the outside of the generator set with a sound insulation board, and installing a shock-absorbing bracket at the bottom of the generator set.

[0013] Preferably, the sound insulation board is composed of a metal plate and a high-density elastic damping material, and the damping material is used to convert the impact energy of sound waves into heat energy, thereby achieving a sound insulation effect.

[0014] 2. A method for converting a tire-type transporter from oil to electricity Based on the same inventive concept, the present invention also provides a method for converting a wheeled transporter from oil to electricity, based on the hybrid drive system of the wheeled transporter described above, specifically comprising the following steps: 1) Power system transformation: A three-phase asynchronous motor is used to replace the diesel engine in the original power system connected to the electronically controlled variable hydraulic pump. The three-phase asynchronous motor is connected to a generator set, and the output power of the three-phase asynchronous motor matches the electronically controlled variable hydraulic pump. 2) Hydraulic system transformation: The original hydraulic system's electronically controlled variable hydraulic pump is controlled by an electrical control system for multi-condition displacement classification; 3) Winch System Renovation: A variable-frequency drive motor with stepless speed regulation replaced the original winch system's hydraulic motor. This motor was connected to the drum reducer via a coupling. A pushrod brake was installed at the coupling position to coordinate with the motor braking, reducer braking, and disc brake braking to achieve a four-level braking control strategy for the winch system. 4) Noise reduction modification: The generator set is a silent generator set, the exterior of which is covered with sound insulation panels, a shock-absorbing bracket is installed at the bottom of the generator set, and a sound-absorbing cotton insulation layer is attached to the inner wall of the cabin of the tire-type transporter drive system.

[0015] Compared with the prior art, the present invention has the following main advantages: 1. This invention significantly improves the efficiency and cost-effectiveness of the wheeled transporter's drive system by converting the existing wheeled transporter's power system, hydraulic system, and hoisting system to electric power. This system, combined with hybrid power system design, multi-operating-condition graded hydraulic displacement control, winch variable-frequency drive, and four-stage coordinated braking control, enables a green upgrade of older equipment and meets the requirements for efficient, energy-saving, and environmentally friendly operation of wheeled transporters. 2. The present invention adopts generator silencing technology combined with drive system cabin sound insulation measures, which can significantly reduce the noise pollution caused by on-site operation of the equipment, is beneficial to the physical and mental health and emotional stability of the operators, and improves the level of civilized construction on site; 3. The present invention is economical, environmentally friendly and safe. By converting oil to electricity, it can save equipment operation and maintenance costs and reduce carbon emissions. The equipment has high stability in operation and can greatly reduce the error rate. The overall operation is convenient, the applicability is strong, and it is easy to promote and use on a large scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the overall hybrid drive system of a wheeled transporter according to an embodiment of the present invention; Figure 2 Flowchart of the oil-to-electric conversion method for a tire-type transporter in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0018] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, or two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0019] Embodiment 1: This embodiment provides a hybrid drive system for a wheeled transporter, such as Figure 1 As shown, it mainly includes: power system, hydraulic system, winch system and electrical control system; The power system is provided with a silent generator set and a three-phase asynchronous motor, the power input end of the silent generator set is connected to the engine of the tire-type transporter, and the power output end of the silent generator set is connected to the power input end of the three-phase asynchronous motor and the power battery pack respectively; The hydraulic system is provided with an electronically controlled hydraulic pump station, which is connected to the power output terminal of the three-phase asynchronous motor and adopts a multi-working-condition displacement graded control strategy; The hoisting system is equipped with a variable frequency drive motor, the output end of which is connected to the drum reducer of the hoisting system through a coupling. A push rod brake is installed at the coupling position to cooperate with the motor braking, reducer braking and disc brake braking to realize the four-level braking control strategy of the hoisting system; The power system, hydraulic system, and hoisting system are all electrically connected to the electrical control system, and the cabin of the hybrid power drive system adopts a sound insulation layout.

[0020] Furthermore, when the power system is in pure electric mode, the generator set and the engine are not working, and the power battery pack provides electrical energy to the three-phase asynchronous motor; when the power system is in hybrid mode, the engine drives the generator set to generate electricity and supplies electrical energy to the three-phase asynchronous motor, and the excess electrical energy is stored in the power battery pack.

[0021] Furthermore, the multi-operating-condition displacement graded control strategy includes: S1, working condition identification: The electrical control system identifies the working condition of the transporter in real time based on the current working status parameters of the transporter; S2, multi-condition hydraulic system displacement control: adjusts the working displacement of the electronically controlled variable hydraulic pump in real time according to the current working condition of the transporter; S3, multi-operating-condition power system energy graded control: Based on the current operating condition of the transporter, the power system switches between pure electric mode and hybrid mode in real time, preliminarily allocating the output power ratio between the generator set and the power battery pack; S4, battery power management and control: During idling conditions, the battery power is monitored and managed in real time based on the voltage, current, and temperature parameters of the power battery pack. By further adjusting the output power ratio of the generator set and the power battery pack, the battery is prevented from being overcharged or over-discharged.

[0022] Furthermore, the current working state parameters of the transporter include: load weight, speed of the generator set, three-phase asynchronous motor and variable frequency drive motor, displacement of the electronically controlled variable hydraulic pump, and battery capacity of the power battery pack; The working conditions of the transport machine include: no-load working conditions and heavy-load working conditions; the heavy-load working conditions specifically include: starting and low-speed transport working conditions, acceleration and medium- and high-speed transport working conditions, idling working conditions, and braking working conditions.

[0023] Furthermore, the multi-mode hydraulic system displacement control specifically includes: Under no-load conditions, adjust the working displacement of the electronically controlled variable hydraulic pump to 70~90ml / r to increase the working pressure of the hydraulic system; Under heavy load conditions, adjust the working displacement of the electronically controlled variable hydraulic pump to 20~40ml / r to reduce the working pressure of the hydraulic system.

[0024] Furthermore, the energy graded control of the multi-operating-mode power system specifically includes: During starting and low-speed transport, the vehicle switches to pure electric mode, using only the power battery pack to power the three-phase asynchronous motor. The generator set does not work at this time, fully utilizing the high torque output characteristics of the battery. During acceleration and medium-to-high-speed handling conditions, the vehicle switches to hybrid mode, allowing the power battery pack and generator set to simultaneously power the three-phase asynchronous motor to meet handling power requirements. Furthermore, the battery power management control specifically includes: During idling conditions, when the battery charge is not lower than the preset threshold, the generator set will shut down and only the power battery pack will power the three-phase asynchronous motor; when the battery charge is lower than the preset threshold, the generator set will start, so that the generator set will power the three-phase asynchronous motor while charging the power battery pack.

[0025] Furthermore, the four-level braking control strategy is specifically as follows: after entering the braking state, the winch system's disc brake is first used for braking; when the transport speed is lower than a preset speed value of one, the winch system's speed reducer is simultaneously used for braking; when the transport speed is lower than a preset speed value of two, the additional push rod brake is further used for braking; when the transport speed is lower than a preset speed value of three, the drive motor is used to load reverse torque for final braking; Among them, the preset speed value 1>preset speed value 2>preset speed value 3.

[0026] Furthermore, the cabin of the hybrid drive system adopts a sound insulation layout scheme, specifically including: a sound-absorbing cotton sound insulation layer is attached to the inner wall of the cabin, a sound insulation board is covered on the outside of the generator set, and a shock-absorbing bracket is installed at the bottom of the generator set.

[0027] Furthermore, the sound insulation board is composed of a metal plate and a high-density elastic damping material, and the damping material is used to convert the impact energy of sound waves into heat energy, thereby achieving a sound insulation effect.

[0028] Example 2: This embodiment provides a hybrid drive system for a wheeled transporter, which can take into account power performance, energy efficiency optimization and safety. Through hybrid system design, hydraulic displacement graded control, winch variable frequency drive and four-level brake coordinated control, it can achieve green upgrades for old equipment.

[0029] The power system includes a three-phase asynchronous motor (132kW) and a silent generator set (400kW), and is equipped with a bidirectional DC / DC converter (input AC380V / output DC600V). The original diesel engine (273kW) was removed and replaced with a three-phase asynchronous motor (132kW / 160kW) to match the electronically controlled variable hydraulic pump station. Furthermore, the hydraulic system adopts displacement graded control: Heavy-load working condition: electronically controlled variable hydraulic pump displacement 80ml / r, system pressure 25MPa, motor power 109kW; No-load condition: displacement 30ml / r, pressure 15.3MPa, motor power 62kW; The steering system is independently set with a pressure of 15MPa and a power of 30kW.

[0030] Furthermore, the winch system uses a YVF2-250M-6-37kW variable frequency drive motor to achieve 0.5-1.5m / min stepless speed regulation to adapt to the original design pulley ratio (20 times); It also adopts a four-level braking logic: the reel mounting seats are interchanged diagonally, and a push rod brake is installed, which is coordinated with the original three-level braking control to prevent the hook from slipping when it is heavily loaded (braking response time ≤ 0.5s); the braking linkage logic: disc brake → reducer brake → push rod brake → motor brake preload.

[0031] Furthermore, the hybrid drive system adopts a silent generator cabin sound insulation design, reducing the overall noise to below 55 decibels.

[0032] By adopting the hybrid drive system of the tire-type transporter mentioned above, a single device can save 100,000 liters of fuel annually, save 720,000 yuan in costs, reduce maintenance costs by 20%, and reduce carbon emissions by 20%, with the risk of hydraulic oil leakage reduced to zero; the decibel level of on-site construction noise is reduced to below 55 decibels, significantly reducing the noise pollution caused by equipment construction, which is beneficial to the physical and mental health and emotional stability of operators, and at the same time reduces the risk of misoperation of equipment due to poor communication caused by noise in actual operations, which is beneficial to improving the safety of equipment operation and improving the level of civilized construction on site.

[0033] Furthermore, this embodiment, by modifying the drive method of the hydraulic winch system and employing a four-stage braking system, achieves zero hook slipping accidents and reduces the misoperation rate by 30%. Furthermore, the variable frequency motor technology, developed over many years in the lifting industry, offers even greater stability. While slight wear and tear of hydraulic components due to their high precision can degrade their performance, electrical components are unaffected, resulting in more consistent and stable performance.

[0034] Example 3: Based on the same inventive concept, this example also provides a tire transporter oil to electricity transformation method, based on the tire transporter hybrid drive system as described above, such as Figure 2 As shown, specifically including: 1) Power system transformation: A three-phase asynchronous motor is used to replace the diesel engine in the original power system connected to the electronically controlled variable hydraulic pump. The three-phase asynchronous motor is connected to a generator set, and the output power of the three-phase asynchronous motor matches the electronically controlled variable hydraulic pump. 2) Hydraulic system transformation: The original hydraulic system's electronically controlled variable hydraulic pump is controlled by an electrical control system for multi-condition displacement classification; 3) Winch System Renovation: A variable-frequency drive motor with stepless speed regulation replaced the original winch system's hydraulic motor. This motor was connected to the drum reducer via a coupling. A pushrod brake was installed at the coupling position to coordinate with the motor braking, reducer braking, and disc brake braking to achieve a four-level braking control strategy for the winch system. 4) Noise reduction modification: The generator set is a silent generator set, the exterior of which is covered with sound insulation panels, a shock-absorbing bracket is installed at the bottom of the generator set, and a sound-absorbing cotton insulation layer is attached to the inner wall of the cabin of the tire-type transporter drive system.

[0035] Furthermore, all parts of this application that are not described in detail are the same as the existing technology or are implemented using the existing technology.

[0036] In summary: 1. This invention significantly improves the efficiency and cost-effectiveness of the wheeled transporter's drive system by converting the existing wheeled transporter's power system, hydraulic system, and hoisting system to electric power. This system, combined with hybrid power system design, multi-operating-condition graded hydraulic displacement control, winch variable-frequency drive, and four-stage coordinated braking control, enables a green upgrade of older equipment and meets the requirements for efficient, energy-saving, and environmentally friendly operation of wheeled transporters. 2. The present invention adopts generator silencing technology combined with drive system cabin sound insulation measures, which can significantly reduce the noise pollution caused by on-site operation of the equipment, is beneficial to the physical and mental health and emotional stability of the operators, and improves the level of civilized construction on site; 3. The present invention is economical, environmentally friendly and safe. By converting oil to electricity, it can save equipment operation and maintenance costs and reduce carbon emissions. The equipment has high stability in operation and can greatly reduce the error rate. The overall operation is convenient, the applicability is strong, and it is easy to promote and use on a large scale.

[0037] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hybrid drive system for a wheeled transporter, characterized in that: include: Power system, hydraulic system, hoisting system and electrical control system; the power system is equipped with a silent generator set and a three-phase asynchronous motor, the power output end of the silent generator set is connected to the electronically controlled variable hydraulic pump station of the tire-type transporter, and the power output end of the silent generator set is connected to the power input end of the three-phase asynchronous motor and the power battery pack respectively; The hydraulic system is provided with an electronically controlled variable hydraulic pump station, which is connected to the power output end of the three-phase asynchronous motor and adopts a multi-working-condition displacement graded control strategy; The hoisting system is equipped with a variable frequency drive motor, the output end of which is connected to the drum reducer of the hoisting system through a coupling. A push rod brake is installed at the coupling position, and the entire system adopts a four-level braking control strategy; The power system, hydraulic system, and hoisting system are all electrically connected to the electrical control system, and the cabin of the hybrid power drive system adopts a sound insulation layout.

2. A hybrid drive system for a wheeled transporter according to claim 1, characterized in that: When the power system is in pure electric mode, the generator set and the engine are not working, and the power battery pack provides electrical energy to the three-phase asynchronous motor; when the power system is in hybrid mode, the engine drives the generator set to generate electricity and supplies electrical energy to the three-phase asynchronous motor, and the excess electrical energy is stored in the power battery pack.

3. A hybrid drive system for a wheeled transporter according to claim 2, characterized in that: The multi-operating-condition displacement graded control strategy includes: S1, working condition identification: The electrical control system identifies the working condition of the transporter in real time based on the current working status parameters of the transporter; S2, multi-condition hydraulic system displacement control: adjusts the working displacement of the electronically controlled variable hydraulic pump in real time according to the current working condition of the transporter; S3, multi-operating-condition power system energy graded control: Based on the current operating condition of the transporter, the power system switches between pure electric mode and hybrid mode in real time, preliminarily allocating the output power ratio between the generator set and the power battery pack; S4, battery power management and control: During idling conditions, the battery power is monitored and managed in real time based on the voltage, current, and temperature parameters of the power battery pack. By further adjusting the output power ratio of the generator set and the power battery pack, the battery is prevented from being overcharged or over-discharged.

4. A hybrid drive system for a wheeled transporter according to claim 3, characterized in that: The current working status parameters of the transporter include: load weight, speed of the generator set, three-phase asynchronous motor and variable frequency drive motor, displacement of the electronically controlled variable hydraulic pump, and battery capacity of the power battery pack; The working conditions of the transport machine include: no-load working conditions and heavy-load working conditions; the heavy-load working conditions specifically include: starting and low-speed transport working conditions, acceleration and medium- and high-speed transport working conditions, idling working conditions, and braking working conditions.

5. A hybrid drive system for a wheeled transporter according to claim 4, characterized in that: The multi-working-mode hydraulic system displacement control specifically includes: Under no-load conditions, adjust the working displacement of the electronically controlled variable hydraulic pump to 70~90ml / r to increase the working pressure of the hydraulic system; Under heavy load conditions, adjust the working displacement of the electronically controlled variable hydraulic pump to 20~40ml / r to reduce the working pressure of the hydraulic system.

6. A hybrid drive system for a wheeled transporter according to claim 4, characterized in that: The multi-operating-mode power system energy hierarchical control specifically includes: During starting and low-speed transport, the vehicle switches to pure electric mode, using only the power battery pack to power the three-phase asynchronous motor. The generator set does not work at this time. During acceleration and medium-to-high-speed handling conditions, the vehicle switches to hybrid mode, allowing the power battery pack and generator set to simultaneously power the three-phase asynchronous motor to meet handling power requirements. The battery power management control specifically includes: During idling conditions, when the battery charge is not lower than the preset threshold, the generator set will shut down and only the power battery pack will power the three-phase asynchronous motor; when the battery charge is lower than the preset threshold, the generator set will start, so that the generator set will power the three-phase asynchronous motor while charging the power battery pack.

7. The hybrid drive system for a wheeled transporter according to claim 4, characterized in that: The four-stage braking control strategy is as follows: after entering the braking state, the winch system's disc brake is first used for braking; when the handling speed is lower than a preset speed value of one, the winch system's speed reducer is simultaneously used for braking; when the handling speed is lower than a preset speed value of two, the additional push rod brake is further used for braking; when the handling speed is lower than a preset speed value of three, the drive motor is used to apply reverse torque for braking; Among them, the preset speed value 1>preset speed value 2>preset speed value 3.

8. The hybrid drive system for a wheeled transporter according to claim 1, characterized in that: The cabin of the hybrid drive system adopts a sound insulation layout scheme, specifically including: a sound-absorbing cotton sound insulation layer is attached to the inner wall of the cabin, a sound insulation board is covered on the outside of the generator set, and a shock-absorbing bracket is installed at the bottom of the generator set.

9. The hybrid drive system for a wheeled transporter according to claim 8, characterized in that: The sound insulation board is composed of a metal plate and a high-density elastic damping material. The damping material is used to convert the impact energy of sound waves into heat energy, thereby achieving a sound insulation effect.

10. A method for converting a wheeled transporter from oil to electricity, based on the hybrid drive system of the wheeled transporter according to any one of claims 1 to 9, characterized in that: include: 1) Power system transformation: A three-phase asynchronous motor is used to replace the diesel engine in the original power system connected to the electronically controlled variable hydraulic pump. The three-phase asynchronous motor is connected to a generator set, and the output power of the three-phase asynchronous motor matches the electronically controlled variable hydraulic pump. 2) Hydraulic system transformation: The original hydraulic system's electronically controlled variable hydraulic pump is controlled by an electrical control system for multi-condition displacement classification; 3) Winch System Renovation: A variable-frequency drive motor with stepless speed regulation replaced the original winch system's hydraulic motor. This motor was connected to the drum reducer via a coupling. A pushrod brake was installed at the coupling position to coordinate with the motor braking, reducer braking, and disc brake braking to achieve a four-level braking control strategy for the winch system. 4) Noise reduction modification: The generator set is a silent generator set, the exterior of which is covered with sound insulation panels, a shock-absorbing bracket is installed at the bottom of the generator set, and a sound-absorbing cotton insulation layer is attached to the inner wall of the cabin of the tire-type transporter drive system.

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