Hybrid construction machine energy control method, system, device, and medium

Abstract

This application discloses an energy control method, system, device, and medium for hybrid power construction machinery, belonging to the technical field of construction machinery technology. The hybrid power construction machinery includes an engine, clutch, electric motor, and hydraulic pump installed sequentially along the same drive shaft, and further includes a motor controller, rectifier, battery management system, and energy storage device. The energy control method for the hybrid power construction machinery includes: determining whether the available external power supply is greater than a first threshold; if so, reading the allowable recharge power of the energy storage device from the battery management system; determining a target power based on the available external power supply, the allowable recharge power, and a reference power; and controlling the rectifier to operate according to the target power to supply energy to the energy storage device and / or the electric motor. This application can effectively utilize external power and improve the service life of the energy storage device in hybrid power construction machinery.

Description

Technical Field

[0001] This application relates to the field of engineering machinery technology, and in particular to a method, system, equipment and medium for energy control of hybrid engineering machinery. Background Technology

[0002] Traditional fuel-powered construction machinery is gradually becoming unable to meet energy conservation and emission reduction regulations and market competition demands due to its high fuel consumption, large emissions, and significant noise pollution.

[0003] In related technologies, hybrid engineering machinery with electric operation mode and range-extended operation mode is usually used for operation; however, the above-mentioned related technologies lack effective energy management mechanisms, cannot make full use of the energy supply potential of external power sources, and affect the service life of energy storage devices.

[0004] Therefore, how to effectively utilize external power sources and improve the service life of energy storage devices in hybrid engineering machinery is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide an energy control method, system, electronic device, and storage medium for hybrid power engineering machinery, which can effectively utilize external power sources and improve the service life of energy storage devices in hybrid power engineering machinery.

[0006] To address the aforementioned technical problems, this application provides an energy control method for hybrid power construction machinery. The hybrid power construction machinery includes an engine, a clutch, an electric motor, and a hydraulic pump installed sequentially along the same drive shaft. The hybrid power construction machinery also includes a motor controller, a rectifier, a battery management system, and an energy storage device. The motor controller is connected to the electric motor, the rectifier, and the battery management system. The battery management system is also connected to the energy storage device and the rectifier. The energy control method for the hybrid power construction machinery includes:

[0007] Determine whether the available power supply from the external power source is greater than the first threshold.

[0008] If so, the allowable recharge power of the energy storage device is read from the battery management system;

[0009] The target power is determined based on the available external power supply, the allowable recharge power, and the reference power; wherein the reference power includes the rated power of the rectifier and / or the maximum operating power of the motor.

[0010] The rectifier is controlled to operate at the target power to power the energy storage device and / or the motor.

[0011] Optionally, determining the target power based on the externally available power supply, the permissible recharge power, and the reference power includes:

[0012] If the hydraulic pump is not in operation and the available external power supply is greater than the allowable recharge power, then determine whether the allowable recharge power is greater than or equal to the rated power of the rectifier.

[0013] If so, then the rated power of the rectifier is set to the target power;

[0014] If not, then set the allowed recharge power to the target power.

[0015] Optionally, determining the target power based on the externally available power supply, the permissible recharge power, and the reference power includes:

[0016] If the hydraulic pump is in operation, and the available external power supply is greater than the allowable recharge power, and the available external power supply is greater than or equal to the rated power of the rectifier, then determine whether the rated power of the rectifier is less than or equal to the sum of the allowable recharge power and the maximum operating power of the motor;

[0017] If so, then the rated power of the rectifier is set to the target power;

[0018] If not, the sum of the allowable recharge power and the maximum operating power of the motor is set as the target power.

[0019] Optionally, determining the target power based on the externally available power supply, the permissible recharge power, and the reference power includes:

[0020] If the hydraulic pump is in operation, and the available external power supply is greater than the allowable recharge power, and the available external power supply is less than the rated power of the rectifier, then determine whether the rated power of the rectifier is less than or equal to the sum of the allowable recharge power and the maximum operating power of the motor;

[0021] If so, then set the external available power supply to the target power;

[0022] If not, the sum of the allowable recharge power and the maximum operating power of the motor is set as the target power.

[0023] Optionally, determining the target power based on the externally available power supply, the permissible recharge power, and the reference power includes:

[0024] If the hydraulic pump is in operation and the available external power supply is less than or equal to the allowable recharge power, then determine whether the available external power supply is less than or equal to the rated power of the rectifier;

[0025] If so, then set the external available power supply to the target power;

[0026] If not, then set the rated power of the rectifier to the target power.

[0027] Optional, also includes:

[0028] Determine whether the current remaining power of the energy storage device is less than the second threshold;

[0029] If so, the clutch is engaged, and the engine is started to drive the hydraulic pump.

[0030] Optionally, after determining whether the current remaining power of the energy storage device is less than the second threshold, the method further includes:

[0031] If the current remaining power is greater than the second threshold and the discharge power of the energy storage device is greater than the maximum operating power of the motor, then the clutch is controlled to be in the disengaged state, and the electrical energy in the energy storage device is used to drive the hydraulic pump to work.

[0032] If the current remaining power is greater than the second threshold, and the sum of the current power of the rectifier and the discharge power of the energy storage device is greater than the maximum operating power of the motor, then the clutch is controlled to be in a disengaged state, and the hydraulic pump is driven to work using the external power supply and the electrical energy in the energy storage device.

[0033] This application also provides a hybrid power engineering machinery energy control system. The hybrid power engineering machinery includes an engine, a clutch, an electric motor, and a hydraulic pump installed sequentially along the same drive shaft. The hybrid power engineering machinery further includes a motor controller, a rectifier, a battery management system, and an energy storage device. The motor controller is connected to the electric motor, the rectifier, and the battery management system respectively. The battery management system is also connected to the energy storage device and the rectifier respectively. The hybrid power engineering machinery energy control system includes:

[0034] An external power supply determination module is used to determine whether the available external power supply is greater than a first threshold.

[0035] An information reading module is used to read the allowable recharge power of the energy storage device from the battery management system if the available external power supply is greater than a first threshold.

[0036] A power determination module is used to determine a target power based on the external available power supply, the allowable recharge power, and a reference power; wherein the reference power includes the rated power of the rectifier and / or the maximum operating power of the motor;

[0037] A rectifier power control module is used to control the rectifier to operate according to the target power so as to supply power to the energy storage device and / or the motor.

[0038] This application also provides a storage medium storing a computer program thereon, which, when executed, implements the steps of the above-described hybrid power engineering machinery energy control method.

[0039] This application also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor, when calling the computer program in the memory, implements the steps of the above-described hybrid power engineering machinery energy control method.

[0040] This application provides an energy control method for hybrid power construction machinery. First, it determines whether the available power supply from an external power source exceeds a set first threshold to ensure that charging only occurs when the external power supply is sufficient. Energy storage devices in different states have different allowable recharge powers; therefore, this application determines the target power required by the rectifier based on the available external power supply, the allowable recharge power, and a reference power. This method of determining the target power ensures that the rectifier does not exceed its operating range and effectively prevents overcharging or over-discharging of the energy storage device. Therefore, this application can effectively utilize external power and improve the service life of the energy storage device in hybrid power construction machinery. This application also provides an energy control system for hybrid power construction machinery, a storage medium, and an electronic device, all with the aforementioned beneficial effects, which will not be elaborated upon here. Attached Figure Description

[0041] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A flowchart of a hybrid power engineering machinery energy control method provided in the embodiments of this application;

[0043] Figure 2 A structural block diagram of a power system for a hybrid power engineering machine provided in an embodiment of this application;

[0044] Figure 3 This is a flowchart of a power control method for a rotary drilling rig provided in an embodiment of this application. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] Please see below. Figure 1 , Figure 1 A flowchart illustrating a hybrid power engineering machinery energy control method provided in an embodiment of this application.

[0047] Specific steps may include:

[0048] S101: Determine whether the available power supply of the external power source is greater than the first threshold; if yes, proceed to S102; if no, end the process.

[0049] This embodiment can be applied to the main controller of hybrid power construction machinery; please refer to [link / reference]. Figure 2 , Figure 2 This application provides a block diagram of a power system for a hybrid power construction machine. The hybrid power construction machine includes an engine, a clutch, an electric motor, and a hydraulic pump, all mounted sequentially along the same drive shaft. It also includes a motor controller, a rectifier, a battery management system (BMS), and an energy storage device. The motor controller is connected to the electric motor, the rectifier, and the BMS. The BMS is also connected to the energy storage device and the rectifier. The hydraulic pump is connected to an electro-hydraulic system, and the rectifier is connected to an external power source. The system may also include a display connected to the BMS. Connections within the system include hydraulic flow, main circuit current, and CAN (Controller Area Network) bus signals. The hybrid power construction machine can be a rotary drilling rig, excavator, tunnel boring machine, etc.

[0050] External power source refers to an external power source such as the power grid, generator, or portable power station. External available power supply refers to the maximum power that the external power source can stably provide to the hybrid power engineering machinery. In this embodiment, sensors or smart meters installed at the external power source interface can acquire parameters such as voltage and current of the external power source in real time and calculate the external available power supply.

[0051] In this embodiment, the first threshold can be determined based on factors such as the power requirements of the hybrid power engineering machinery, the rated power of the rectifier, and the safety margin. Alternatively, the first threshold can be determined based on information input by the user, such as 20 kilowatts.

[0052] This step compares the available external power supply with the first threshold. If the available external power supply is greater than the first threshold, it means that the external power supply is stable and has sufficient power to provide energy safely. If the available external power supply is less than or equal to the first threshold, it means that the external power supply is unstable or insufficient and does not meet the functional requirements of the hybrid power engineering machinery.

[0053] S102: Read the allowable recharge power of the energy storage device from the battery management system;

[0054] This step is based on the premise that the available external power supply is greater than a first threshold. At this point, the allowable recharge power of the energy storage device can be read from the battery management system. The aforementioned battery management system has the function of outputting the capacity of the energy storage device, the upper limit of allowable charging power, the lower limit of allowable charging power, the upper limit of allowable discharging power, the lower limit of allowable discharging power, and the allowable recharge power in real time.

[0055] As a feasible implementation, if the allowable recharge power of the energy storage device is greater than 0, the operations of S103 and S104 can continue to be executed; if the allowable recharge power of the energy storage device is equal to 0, the rectifier can be directly controlled to stop working.

[0056] S103: Determine the target power based on the external available power supply, the allowable recharge power, and the reference power;

[0057] Prior to this step, a reference power acquisition operation may be performed. This reference power includes the rated power of the rectifier and may also include the maximum operating power of the motor. In this embodiment, the target power can be determined by combining the available external power supply, the allowable recharge power, and the reference power. The target power is the actual power of the rectifier.

[0058] S104: Control the rectifier to operate according to the target power so as to supply power to the energy storage device and / or the motor.

[0059] Once the target power is determined, the rectifier can be controlled to operate according to the target power in order to supply power to the energy storage device and / or the motor.

[0060] This embodiment first determines whether the available power supply of the external power source is greater than a set first threshold to ensure that charging is only performed when the external power supply is sufficient. Energy storage devices in different states have different allowable recharge powers; therefore, this embodiment determines the target power required by the rectifier based on the available external power supply, the allowable recharge power, and a reference power. This method of determining the target power ensures that the rectifier will not exceed its operating range and effectively prevents overcharging or over-discharging of the energy storage device. Therefore, this embodiment can effectively utilize external power and improve the service life of the energy storage device in hybrid power engineering machinery.

[0061] As for Figure 1 As further described in the corresponding embodiments, the target power can be determined in the following ways.

[0062] Method 1: If the hydraulic pump is not in operation and the available external power supply is greater than the allowable recharge power, then determine whether the allowable recharge power is greater than or equal to the rated power of the rectifier; if yes, then set the rated power of the rectifier to the target power; if no, then set the allowable recharge power to the target power.

[0063] Option 2: If the hydraulic pump is in operation, and the available external power supply is greater than the allowable recharge power, and the available external power supply is greater than or equal to the rated power of the rectifier, then determine whether the rated power of the rectifier is less than or equal to the sum of the allowable recharge power and the maximum operating power of the motor; if yes, then set the rated power of the rectifier to the target power; if no, then set the sum of the allowable recharge power and the maximum operating power of the motor to the target power.

[0064] Option 3: If the hydraulic pump is in operation, and the available external power supply is greater than the allowable recharge power, and the available external power supply is less than the rated power of the rectifier, then determine whether the rated power of the rectifier is less than or equal to the sum of the allowable recharge power and the maximum operating power of the motor; if yes, then set the available external power supply to the target power; if no, then set the sum of the allowable recharge power and the maximum operating power of the motor to the target power.

[0065] Option 4: If the hydraulic pump is in operation and the available external power supply is less than or equal to the allowable recharge power, then determine whether the available external power supply is less than or equal to the rated power of the rectifier; if yes, then set the available external power supply to the target power; if no, then set the rated power of the rectifier to the target power.

[0066] As for Figure 1 In a further description of the corresponding embodiment, the hybrid power engineering machinery can also determine whether the current remaining power of the energy storage device is less than a second threshold.

[0067] If the remaining battery power is less than the second threshold, the clutch is engaged and the engine is started to drive the hydraulic pump.

[0068] If the current remaining power is greater than the second threshold and the discharge power of the energy storage device is greater than the maximum operating power of the motor, then the clutch is controlled to be in a disengaged state, and the electrical energy in the energy storage device is used to drive the hydraulic pump.

[0069] If the current remaining power is greater than the second threshold, and the sum of the current power of the rectifier and the discharge power of the energy storage device is greater than the maximum operating power of the motor, then the clutch is controlled to be in a disengaged state, and the hydraulic pump is driven to work using the external power supply and the electrical energy in the energy storage device.

[0070] The process described in the above embodiments is illustrated below through examples in practical applications.

[0071] Mainstream fuel-fired rotary drilling rigs have high fuel consumption, emissions, and noise levels. Due to energy conservation and emission reduction regulations and increased market competition, some new energy electric rotary drilling rigs are now being used in the market. Small and medium-sized models are primarily pure electric, limiting their use to locations with external power supplies. Medium and large models are mainly range-extended, operating in electric mode in locations with external power supplies, offering advantages such as low energy costs and zero emissions. In locations without external power supplies, they can also operate in range-extended mode, meeting the needs of various usage scenarios.

[0072] Range-extended rotary drilling rigs primarily utilize a series range-extending technology approach. Their power structure consists of an engine, clutch, electric motor, and oil pump installed sequentially along the same drive shaft. In electric operation mode, the clutch disengages, and the electric motor drives the oil pump to provide pressure oil for the entire machine's hydraulic system. In range-extending operation mode, the clutch engages, the engine drives the oil pump, and simultaneously drives the electric motor to function as a generator, charging the energy storage device.

[0073] Due to the limitations of the energy storage device's charging and discharging capabilities, its storage capacity, and temperature-related variations, and in order to prevent damage from overcharging or over-discharging, the technology utilizes external power sources insufficiently. When the external power supply is less than the average power required for operation, the range-extended operation mode is used, but the external power supply is not utilized. At the same time, there are unreasonable dynamic adjustments between hydraulic load changes and power generation, resulting in large fluctuations in engine speed, high fuel consumption, and high emissions. In the electric operation mode, when the hydraulic load changes dynamically, the identification of motor power changes and the control strategy for effective utilization of external power supply are mismatched, resulting in insufficient external power supply, excessive battery charging and discharging power, and excessively long charging time.

[0074] To address the technical problems existing in the aforementioned related technologies, this embodiment provides a power control scheme for a rotary drilling rig. The range-extended rotary drilling rig used in this scheme adopts a power structure based on a series range-extending technology route. The engine, clutch, motor, and oil pump are installed sequentially along the same drive shaft. In electric operation mode, the clutch remains disengaged, and the motor drives the oil pump to provide pressure oil for the entire hydraulic system. The electro-hydraulic system performs various operations as needed. In range-extended operation mode, the clutch remains engaged, and the engine transmits torque through the clutch. The engine drives the oil pump to provide pressure oil, and the electro-hydraulic system performs various operations as needed. Simultaneously, when the engine has remaining available power, the motor operates as a generator. After reverse inversion by the motor controller, the power is used to charge the energy storage device. External power is rectified by the rectifier to charge the energy storage device and power the motor. The battery management system (BMS), main controller, display, motor controller, rectifier, and engine exchange operating data in real time via internal CAN communication. The main controller collects, calculates, and controls the data, and the display shows the system's operating status data. The display can also be used to set the available power of the external power supply.

[0075] Based on the identification and setting of the available external power supply and the upper / lower limits of the allowable charging and discharging power and recharge power of the energy storage device, the Battery Management System (BMS) has the function of outputting the capacity, allowable upper and lower limits of charging and discharging power, and recharge power data of the energy storage device in real time. The available external power supply is provided by the on-site construction party and set on the display. The discharge capacity of the energy storage device is designed to meet the maximum power requirements of the electric motor (i.e., the hydraulic pump motor or oil pump motor), and the efficiency of each component is calculated in the actual program.

[0076] External power supply In the case of (y1 is a variable constant that can be adjusted according to the configuration power of different models), KW represents kilowatts, and the allowable recharge power of the energy storage device. When the rectifier is in operation, its operating power W3 is adjusted according to the following operating conditions. If the calculated operating power of the rectifier is greater than its rated power, the output is limited to the rated power. In this embodiment, the energy storage device is charged and the hydraulic pump motor is powered by judging the operating conditions and calculating the rectifier's operating power W3.

[0077] This embodiment can limit the rectifier to operate at its rated power when the calculated rectifier operating power is greater than the rectifier's rated power; this embodiment can control the rectifier's recharge power to always be less than or equal to the energy storage device's allowable recharge power W2; this embodiment can control the energy storage device's capacity to always be less than its upper limit.

[0078] Operating Condition 1: After the control system is started, when the electric hydraulic pump is not running, the external available power supply W1 is greater than the energy storage device's allowable recharge power W2. If the energy storage device's allowable recharge power W2 is greater than or equal to the rectifier's rated power W6, the rectifier will operate at the rated power W6 to recharge the energy storage device. If the energy storage device's allowable recharge power W2 is less than the rectifier's rated power W6, the rectifier will operate at the allowable recharge power W2 to recharge the energy storage device.

[0079] Operating Condition 2: After the control system is started, when the electric hydraulic pump is running, if the external available power supply W1 > the energy storage device's allowable recharge power W2, and the external available power supply W1 ≥ the rectifier's rated power W6, and if the rectifier's rated power W6 ≤ the energy storage device's allowable recharge power W2 + the motor's maximum operating power W8, the rectifier will operate at its rated power W6 to simultaneously supply power to both the energy storage device and the motor; if the rectifier's rated power W6 > the energy storage device's allowable recharge power W2 + the motor's maximum operating power W8, the rectifier will operate at the power of the energy storage device's allowable recharge power W2 + the motor's maximum operating power W8 to recharge the energy storage device and supply power to the motor.

[0080] Operating Condition 3: After the control system starts, when the electric hydraulic pump is running, and the external available power supply W1 > the energy storage device's allowable recharge power W2, and the external available power supply W1 < the rectifier's rated power W6, if the rectifier's rated power W6 ≤ the energy storage device's allowable recharge power W2 + the motor's maximum operating power W8, the rectifier operates at the external available power supply W1 to simultaneously supply power to the energy storage device and the motor; if the rectifier's rated power W6 > the energy storage device's allowable recharge power W2 + the motor's maximum operating power W8, the rectifier operates at the power of the energy storage device's allowable recharge power W2 + the motor's maximum operating power W8 to recharge the energy storage device and supply power to the motor.

[0081] Operating Condition 4: After the control system starts, when the available external power supply W1 is less than or equal to the allowable recharge power W2 of the energy storage device, if the available external power supply W1 is less than or equal to the rated power W6 of the rectifier, the rectifier will operate at the available external power supply W1 to recharge the energy storage device; if the available external power supply W1 is greater than or equal to the rated power W6 of the rectifier, the rectifier will operate at the rated power W6 of the rectifier to recharge the energy storage device.

[0082] In this scheme, the charging and discharging of the energy storage device are in the same circuit, which is directly connected to the main output circuit of the rectifier and the main power supply circuit of the electric hydraulic pump. That is, the output of the rectifier can simultaneously supply power to the hydraulic pump motor and charge the energy storage device. When the output power of the rectifier is less than the power required by the motor, the energy storage device changes from recharging to discharging, providing the motor with energy greater than the output power of the rectifier.

[0083] In practical applications, the output voltage of the rectifier is set higher than the system voltage of the energy storage device to enable charging and power supply to the motor. When the power demand of the motor exceeds the output power of the rectifier, the rectifier will automatically reduce its output voltage due to overload until it is the same as the system voltage of the energy storage device. Then, the energy storage device and the rectifier will supply power to the motor simultaneously.

[0084] When the control system is started and there is a hydraulic system operation command, if the SOC of the energy storage device is less than the lower limit b1 or the SOC after the engine starts is less than the upper limit b2, the drive clutch remains engaged, the engine starts and runs at speed v1, the hydraulic pump operates to provide pressurized oil, and the electro-hydraulic system operates as needed. When the rectifier operating power W3 is less than the energy storage device's allowable recharge power W2, and if the allowable recharge power W2 - rectifier operating power W3 is less than the engine's remaining usable power W4, the electric motor operates as a generator, and the generated power W7 = allowable recharge power W2 - rectifier operating power W3; otherwise, the generated power W7 = engine's remaining usable power W4. When the rectifier operating power W3 ≥ allowable recharge power W2, the generated power W7 = 0. SOC (State of Charge) represents the remaining electricity.

[0085] In this embodiment, the output power W9 at each operating speed can be obtained from the engine manufacturer's technical documents. The engine's cooling fan and generator power generally account for about 10% of the engine's output power, with a 5% power reserve. The power W10 of each working action of the electro-hydraulic system is preset through design parameters. The remaining usable power of the engine W4 = the engine's output power W7 - (W7 0.15) - Hydraulic system operating power W10.

[0086] When the control system is started and there is a hydraulic system operation command, if the SOC of the energy storage device is greater than the lower limit b1, if the discharge power of the energy storage device W7 is greater than the maximum operating power of the motor W8, or if the operating power of the rectifier W3 + the power generation W7 is greater than the maximum operating power of the motor W8, then the clutch remains disengaged, the motor controller drives the electric hydraulic pump to run at a speed of v1 to provide a pressure oil source, and the electro-hydraulic system performs operations as needed.

[0087] When there is a hydraulic system operation command, such as when the SOC of the energy storage device > the lower limit b1 If the coefficient y2 (y2 is a variable constant) is set, and the SOC > lower limit b1 after the electric hydraulic pump starts, then the drive clutch disengages, the motor controller drives the electric hydraulic pump to run at speed v1 to provide pressure oil, and the electro-hydraulic system performs operations as needed.

[0088] Based on the identification and setting of the external available power supply and the upper / lower limits and power of the energy storage device for charging and discharging, the BMS has the function of outputting the capacity, upper and lower limits of the allowed charging and discharging and power data of the energy storage device in real time; the external available power supply is provided by the construction party and set on the display.

[0089] Please see Figure 3 , Figure 3 The flowchart illustrates a power control method for a rotary drilling rig provided in this application embodiment. W1 represents the available external power supply, W2 represents the allowable recharge power of the energy storage device, W3 represents the operating power of the rectifier, W4 represents the remaining available power of the engine, W6 represents the rated power of the rectifier, W7 represents the power generation capacity, W8 represents the maximum operating power of the electric motor, Y indicates a yes result, and N indicates a no result. The process is as follows:

[0090] After the control system is started, it checks for any abnormal alarms. If any abnormal alarms are found, maintenance is performed.

[0091] If no abnormal alarm is detected, the allowable recharge power of the energy storage device is set to W2 > 0, and the available power of the external power supply is set to W1 > 10KW. If y1, then determine whether W1 is greater than W2.

[0092] If W1 is not greater than W2, then determine whether W1 is less than or equal to W6. If so, set W3=W1; otherwise, set W3=W6.

[0093] If W1 is greater than W2, determine whether the motor drives the hydraulic pump; if it does not, determine whether W2 is greater than or equal to W6. If W2 is greater than or equal to W6, then W3 = W6; if W2 is less than W6, then W3 = W2.

[0094] If the motor has already driven the hydraulic pump, then determine whether W1 is greater than or equal to W6; if W1 is greater than or equal to W6, then determine whether W6 is less than or equal to W2+W8. If yes, then set W3=W6; otherwise, set W3=W2+W8. If W1 is less than W6, then determine whether W1 is less than or equal to W2+W8. If yes, then set W3=W1; otherwise, set W3=W2+W8.

[0095] Upon receiving the hydraulic system operation command, if the energy storage device's SOC < lower limit b1 or (OR) the engine's SOC after starting < upper limit b2, the clutch status is determined. If it is in the disengaged state (OFF), the clutch is disengaged, and the determination is repeated until it is in the engaged state (ON). After the clutch is engaged, the engine can be started and run at speed v1. It is determined whether W3 is less than W2. If W3 is less than W2, the hydraulic pump motor is controlled to operate as a generator when (W2-W3) ≤ the remaining available engine power W4, at which point the generated power W7 = W2-W3. Alternatively, the hydraulic pump motor can be controlled to operate as a generator when (W2-W3) > the remaining available engine power W4, at which point the generated power W7 = W4. If W3 is greater than or equal to W2, W7 is set to 0.

[0096] If SOC > lower limit b1, then when W7 > W8 or W3 + W7 > W8, the clutch status is determined; if it is ON (engaged), it means the clutch is engaged and the determination is repeated; if it is OFF (disengaged), the motor controller drives the motor to run at speed v1 to make the hydraulic pump run and the electro-hydraulic system operate.

[0097] When operating in range-extended mode, this embodiment optimizes the control strategy, taking constant power load as the control target. When the load of the hydraulic system changes, the generator power output is adjusted to optimize and reduce the range of engine speed fluctuations, thereby reducing fuel consumption, carbon emissions and noise.

[0098] The electric motor boasts an energy conversion efficiency over 40% higher than that of an engine. Through optimized control strategies, the operation process fully utilizes external power to charge the energy storage device or supply part or all of the power needed for the electric oil pump. By activating the rectifier in range-extended operation mode to increase the energy storage device's recharge power and reduce engine operating time, energy conversion efficiency losses and the cost difference between fuel and electricity can be minimized. In electric operation mode, the external power supply is automatically increased as needed, reducing the energy storage device's discharge capacity and charging time, decreasing the number of charge / discharge cycles, and extending the lifespan of the energy storage components.

[0099] As can be seen, this embodiment can achieve the beneficial effects of reduced energy consumption and zero emissions in electric mode operation of the series-connected range-extended rotary drilling rig, stable engine speed, reduced emissions, fuel consumption and noise in range-extended mode operation, and extended life of energy storage components and engine.

[0100] This application provides an energy control system for hybrid power construction machinery. The hybrid power construction machinery includes an engine, a clutch, an electric motor, and a hydraulic pump installed sequentially along the same drive shaft. The hybrid power construction machinery also includes a motor controller, a rectifier, a battery management system, and an energy storage device. The motor controller is connected to the electric motor, the rectifier, and the battery management system. The battery management system is also connected to the energy storage device and the rectifier. The energy control system for the hybrid power construction machinery includes:

[0101] An external power supply determination module is used to determine whether the available external power supply is greater than a first threshold.

[0102] An information reading module is used to read the allowable recharge power of the energy storage device from the battery management system if the available external power supply is greater than a first threshold.

[0103] A power determination module is used to determine a target power based on the external available power supply, the allowable recharge power, and a reference power; wherein the reference power includes the rated power of the rectifier and / or the maximum operating power of the motor;

[0104] A rectifier power control module is used to control the rectifier to operate according to the target power so as to supply power to the energy storage device and / or the motor.

[0105] This embodiment first determines whether the available power supply of the external power source is greater than a set first threshold to ensure that charging is only performed when the external power supply is sufficient. Energy storage devices in different states have different allowable recharge powers; therefore, this embodiment determines the target power required by the rectifier based on the available external power supply, the allowable recharge power, and a reference power. This method of determining the target power ensures that the rectifier will not exceed its operating range and effectively prevents overcharging or over-discharging of the energy storage device. Therefore, this embodiment can effectively utilize external power and improve the service life of the energy storage device in hybrid power engineering machinery.

[0106] Furthermore, the process by which the power determination module determines the target power based on the external available power supply, the allowable recharge power, and the reference power includes: if the hydraulic pump is not in operation and the external available power supply is greater than the allowable recharge power, then it is determined whether the allowable recharge power is greater than or equal to the rated power of the rectifier; if yes, then the rated power of the rectifier is set as the target power; if no, then the allowable recharge power is set as the target power.

[0107] The process by which the power determination module determines the target power based on the external available power supply, the allowable recharge power, and the reference power includes: if the hydraulic pump is in operation, and the external available power supply is greater than the allowable recharge power, and the external available power supply is greater than or equal to the rated power of the rectifier, then it is determined whether the rated power of the rectifier is less than or equal to the sum of the allowable recharge power and the maximum operating power of the motor; if yes, then the rated power of the rectifier is set as the target power; if no, then the sum of the allowable recharge power and the maximum operating power of the motor is set as the target power.

[0108] Furthermore, the process by which the power determination module determines the target power based on the externally available power supply, the allowable recharge power, and the reference power includes: if the hydraulic pump is in operation, and the externally available power supply is greater than the allowable recharge power, and the externally available power supply is less than the rated power of the rectifier, then it is determined whether the rated power of the rectifier is less than or equal to the sum of the allowable recharge power and the maximum operating power of the motor; if so, the externally available power supply is set as the target power; if not, the sum of the allowable recharge power and the maximum operating power of the motor is set as the target power.

[0109] Furthermore, the process by which the power determination module determines the target power based on the external available power supply, the allowable recharge power, and the reference power includes: if the hydraulic pump is in operation and the external available power supply is less than or equal to the allowable recharge power, then it is determined whether the external available power supply is less than or equal to the rated power of the rectifier; if yes, then the external available power supply is set as the target power; if no, then the rated power of the rectifier is set as the target power.

[0110] Furthermore, it also includes:

[0111] The clutch control module is used to determine whether the current remaining power of the energy storage device is less than a second threshold; if so, it controls the clutch to be engaged and starts the engine to drive the hydraulic pump.

[0112] Furthermore, the clutch control module is also configured to, if the current remaining power is greater than the second threshold and the discharge power of the energy storage device is greater than the maximum operating power of the motor, control the clutch to be in a disengaged state and use the electrical energy in the energy storage device to drive the hydraulic pump; and is also configured to, if the current remaining power is greater than the second threshold and the sum of the current power of the rectifier and the discharge power of the energy storage device is greater than the maximum operating power of the motor, control the clutch to be in a disengaged state and use the external power supply and the electrical energy in the energy storage device to drive the hydraulic pump.

[0113] Since the embodiments of the system part correspond to the embodiments of the method part, please refer to the description of the embodiments of the method part for the embodiments of the system part, and they will not be repeated here.

[0114] This application also provides a storage medium on which a computer program is stored, which, when executed, can perform the steps provided in the above embodiments. The storage medium may include various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0115] This application also provides an electronic device that may include a memory and a processor. The memory stores a computer program, and when the processor calls the computer program in the memory, it can implement the steps provided in the above embodiments. Of course, the electronic device may also include various network interfaces, power supplies, and other components.

[0116] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of this application.

[0117] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A method for energy control of hybrid power engineering machinery, characterized in that, The hybrid power engineering machinery includes an engine, a clutch, an electric motor, and a hydraulic pump installed sequentially along the same drive shaft. The hybrid power engineering machinery also includes a motor controller, a rectifier, a battery management system, and an energy storage device. The motor controller is connected to the electric motor, the rectifier, and the battery management system. The battery management system is also connected to the energy storage device and the rectifier. The energy control method of the hybrid power engineering machinery includes: Determine whether the available power supply from the external power source is greater than the first threshold. If so, the allowable recharge power of the energy storage device is read from the battery management system; The target power is determined based on the available external power supply, the allowable recharge power, and the reference power; wherein the reference power includes the rated power of the rectifier and / or the maximum operating power of the motor. The rectifier is controlled to operate at the target power in order to power the energy storage device and / or the motor; Determining the target power based on the available external power supply, the allowable recharge power, and the reference power includes: If the hydraulic pump is in operation, and the available external power supply is greater than the allowable recharge power, and the available external power supply is greater than or equal to the rated power of the rectifier, then determine whether the rated power of the rectifier is less than or equal to the sum of the allowable recharge power and the maximum operating power of the motor; If so, then the rated power of the rectifier is set to the target power; If not, the sum of the allowable recharge power and the maximum operating power of the motor is set as the target power.

2. The energy control method for hybrid power engineering machinery according to claim 1, characterized in that, Determining the target power based on the externally available power supply, the permissible recharge power, and the reference power includes: If the hydraulic pump is not in operation and the available external power supply is greater than the allowable recharge power, then determine whether the allowable recharge power is greater than or equal to the rated power of the rectifier. If so, then the rated power of the rectifier is set to the target power; If not, then set the allowed recharge power to the target power.

3. The energy control method for hybrid power engineering machinery according to claim 1, characterized in that, Determining the target power based on the externally available power supply, the permissible recharge power, and the reference power includes: If the hydraulic pump is in operation, and the available external power supply is greater than the allowable recharge power, and the available external power supply is less than the rated power of the rectifier, then determine whether the rated power of the rectifier is less than or equal to the sum of the allowable recharge power and the maximum operating power of the motor; If so, then set the external available power supply to the target power; If not, the sum of the allowable recharge power and the maximum operating power of the motor is set as the target power.

4. The energy control method for hybrid power engineering machinery according to claim 1, characterized in that, Determining the target power based on the externally available power supply, the permissible recharge power, and the reference power includes: If the hydraulic pump is in operation and the available external power supply is less than or equal to the allowable recharge power, then determine whether the available external power supply is less than or equal to the rated power of the rectifier; If so, then set the external available power supply to the target power; If not, then set the rated power of the rectifier to the target power.

5. The energy control method for hybrid power engineering machinery according to claim 1, characterized in that, Also includes: Determine whether the current remaining power of the energy storage device is less than the second threshold; If so, the clutch is engaged, and the engine is started to drive the hydraulic pump.

6. The energy control method for hybrid power engineering machinery according to claim 5, characterized in that, After determining whether the current remaining power of the energy storage device is less than the second threshold, the method further includes: If the current remaining power is greater than the second threshold and the discharge power of the energy storage device is greater than the maximum operating power of the motor, then the clutch is controlled to be in the disengaged state, and the electrical energy in the energy storage device is used to drive the hydraulic pump to work. If the current remaining power is greater than the second threshold, and the sum of the current power of the rectifier and the discharge power of the energy storage device is greater than the maximum operating power of the motor, then the clutch is controlled to be in a disengaged state, and the hydraulic pump is driven to work using the external power supply and the electrical energy in the energy storage device.

7. A hybrid power engineering machinery energy control system, characterized in that, The hybrid power engineering machinery includes an engine, a clutch, an electric motor, and a hydraulic pump installed sequentially along the same drive shaft. The hybrid power engineering machinery also includes a motor controller, a rectifier, a battery management system, and an energy storage device. The motor controller is connected to the electric motor, the rectifier, and the battery management system. The battery management system is also connected to the energy storage device and the rectifier. The energy control system of the hybrid power engineering machinery includes: An external power supply determination module is used to determine whether the available external power supply is greater than a first threshold. An information reading module is used to read the allowable recharge power of the energy storage device from the battery management system if the available external power supply is greater than a first threshold. A power determination module is used to determine a target power based on the external available power supply, the allowable recharge power, and a reference power; wherein the reference power includes the rated power of the rectifier and / or the maximum operating power of the motor; A rectifier power control module is used to control the rectifier to operate according to the target power so as to supply power to the energy storage device and / or the motor; The process by which the power determination module determines the target power based on the external available power supply, the allowable recharge power, and the reference power includes: if the hydraulic pump is in operation, and the external available power supply is greater than the allowable recharge power, and the external available power supply is greater than or equal to the rated power of the rectifier, then it is determined whether the rated power of the rectifier is less than or equal to the sum of the allowable recharge power and the maximum operating power of the motor; if yes, then the rated power of the rectifier is set as the target power; if no, then the sum of the allowable recharge power and the maximum operating power of the motor is set as the target power.

8. An electronic device, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program, and the processor, when calling the computer program in the memory, implements the steps of the hybrid power engineering machinery energy control method as described in any one of claims 1 to 6.

9. A storage medium, characterized in that, The storage medium stores computer-executable instructions, which, when loaded and executed by a processor, implement the steps of the hybrid power engineering machinery energy control method as described in any one of claims 1 to 6.

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