Flow matching control system and electric engineering machinery

Abstract

The invention provides a flow matching control system and an electric engineering machine, and relates to the technical field of flow matching control. The power source flow matching mode of the existing electric engineering machinery has the problem of insufficient efficiency improvement space. According to the system, the motor efficiency model and the hydraulic pump efficiency model are established, the rotating speed of the motor and the displacement of the hydraulic pump are dynamically adjusted according to the target flow of the system by combining an optimization algorithm and weighting processing, so that the power source keeps high-efficiency operation in real time, and the overall efficiency of the system is improved. The device is suitable for combination of various power sources and hydraulic systems, can be widely applied to the field of electric engineering machinery, and has the advantages of remarkable energy-saving effect and dynamic response.

Description

Technical Field

[0001] The present invention relates to the technical field of flow matching control, and in particular to a flow matching control system and an electric engineering machinery. Background Art

[0002] Electrification has gradually become the mainstream trend in the development of construction machinery due to its advantages such as zero emissions, low noise, high efficiency and energy saving. In actual use, electrification is not just a simple replacement of traditional internal combustion engines with electric motors, but also requires the optimization of the control strategy of the power system to achieve higher energy efficiency.

[0003] In traditional engineering machinery, the power source usually adopts the method of internal combustion engine driving variable displacement pump, and the flow demand of the system is matched through the control strategy of constant speed-variable displacement. However, with the advancement of electrification, the flow matching method of the power source has changed significantly. The power source of electric engineering machinery consists of motors and hydraulic pumps, and its control method has also evolved into various forms such as constant speed-variable displacement, variable speed-fixed displacement, and variable speed-variable displacement. Among them, the variable speed-variable displacement control method has gradually become a research hotspot due to its advantages such as fast dynamic response, large flow adjustment range, and high efficiency.

[0004] However, although the variable speed-variable displacement control method has high efficiency in theory, in practical applications, the existing control strategies still have certain limitations. At present, the common practice on the market is to adopt a staged double-variable control strategy, that is, when the system target flow increases, the displacement of the hydraulic pump is first increased to the maximum displacement, and then the motor speed is increased; when the system target flow decreases, the motor speed is first reduced to the minimum speed, and then the displacement of the hydraulic pump is reduced. The basis of this strategy is that the motor has a high efficiency in the entire working range, while the hydraulic pump is efficient only in a large displacement range. Therefore, in order to ensure that the power source works in the high-efficiency range, the existing control strategy usually keeps the displacement of the hydraulic pump at the maximum value required by the system flow at all times. However, this control method does not fully consider the efficiency changes of the motor and the hydraulic pump under different working conditions, resulting in the comprehensive efficiency of the power source not always being maintained at the highest level, and there is a certain amount of energy waste.

[0005] In addition, the existing control strategies are also deficient in terms of dynamic response and load adaptability. Since the load flow of construction machinery is often random and changes rapidly, the existing control methods are difficult to respond quickly to changes in load while ensuring high efficiency. This not only affects the overall efficiency of the system, but may also cause the power source to operate inefficiently under certain conditions, further exacerbating energy waste. Therefore, although the existing flow matching control method for electric construction machinery has high efficiency in theory, it still has problems such as low comprehensive efficiency of the power source, slow dynamic response, and energy waste in actual applications.

[0006] In view of this, this application is filed. Summary of the invention

[0007] The present invention provides a flow matching control system and an electric engineering machine, which can at least partially improve the above-mentioned problems.

[0008] To achieve the above object, the present invention adopts the following technical solutions: A flow matching control system, comprising: a drive component, a hydraulic component, a vehicle controller, and a sensor component, wherein the output end of the drive component is coaxially mechanically connected to the input end of the hydraulic component, the input end of the hydraulic component is used to connect to a hydraulic oil tank, the sensor component is arranged on a circuit of the hydraulic component, the output end of the sensor component is electrically connected to the input end of the vehicle controller, and the output end of the vehicle controller is electrically connected to the input end of the drive component and the input end of the hydraulic component; The vehicle controller is configured to implement the following steps by executing a computer program stored therein: Obtain the pump outlet pressure collected by the sensor assembly p and pump outlet flow q , and set the displacement in the program V , calculate the corresponding speed , the pump output power , the pump input power , motor torque ,in, is the overall efficiency of the pump; The speed n , torque T , Pump outlet pressure p , Pump outlet flow q Input into the preset motor efficiency model and hydraulic pump efficiency model to calculate the motor efficiency and hydraulic pump efficiency ; The motor efficiency and hydraulic pump efficiency An optimization algorithm is performed to solve and weighted processing is performed to calculate the optimal solution of the speed-displacement combination, and the drive component and the hydraulic component are adjusted and controlled according to the optimal solution of the speed-displacement combination.

[0009] The present invention further provides an electric engineering machine, comprising: an electric engineering machine body and a flow matching control system as described in any one of the above items, wherein the flow matching control system is configured on the electric engineering machine body.

[0010] In summary, the flow matching control system constructs the efficiency model of the motor and hydraulic pump, combines advanced optimization algorithms and weighted processing technology, and dynamically adjusts the motor speed and hydraulic pump displacement to achieve the best match with the system flow demand. Specifically, the target flow is first calculated through the system input signal, and then the pressure and flow data fed back by the sensor are used to calculate the efficiency of the motor and hydraulic pump in real time, and the optimal speed-displacement combination is screened out through the optimization algorithm. Finally, the working state of the motor and hydraulic pump is accurately adjusted through the vehicle controller to ensure that the power source is always in the efficient operating range. It aims to improve the power source efficiency of construction machinery, reduce energy consumption, and improve the dynamic response performance of the system by optimizing the collaborative working mode of the motor and hydraulic pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a module schematic diagram of a flow matching control system provided by the first embodiment of the present invention; Figure 2 It is a flow chart of the flow matching control system provided by the first embodiment of the present invention. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0013] refer to Figure 1 As shown, the first embodiment of the present invention discloses a flow matching control system, comprising: a drive component, a hydraulic component, a vehicle controller 5, and a sensor component, wherein the output end of the drive component is coaxially mechanically connected to the input end of the hydraulic component, the input end of the hydraulic component is used to connect to the hydraulic oil tank, the sensor component is arranged on the circuit of the hydraulic component, the output end of the sensor component is electrically connected to the input end of the vehicle controller 5, and the output end of the vehicle controller 5 is electrically connected to the input end of the drive component and the input end of the hydraulic component; In this embodiment, the system is mainly composed of a drive component, a hydraulic component, a vehicle controller and a sensor component. Among them, the output end of the drive component is connected to the first end of the hydraulic component through a coaxial mechanical connection, which ensures the efficient transmission of power. The input end of the hydraulic component is connected to the hydraulic oil tank to provide the necessary hydraulic oil for the hydraulic system. The sensor component is configured on the circuit of the hydraulic component to monitor the key parameters of the system operation status in real time and feed these parameters back to the vehicle controller. The vehicle controller 5 serves as the "brain" of the system. Its output end is electrically connected to the input end of the drive component and the hydraulic component. By receiving the feedback signal of the sensor component, the drive component and the hydraulic component are precisely controlled, thereby realizing the intelligent operation of the system.

[0014] Preferably, the driving component includes an energy source 1, a motor controller 2, and an electric motor 3, wherein the output end of the energy source 1 is electrically connected to the power supply end of the motor controller 2, the output end of the motor controller 2 is electrically connected to the control end of the electric motor 3, and the output end of the vehicle controller 5 is electrically connected to the input end of the motor controller 2.

[0015] Preferably, the energy source 1 is a combination of a battery pack and a battery management system or a combination of a power grid and a rectifier, and the motor 3 is a permanent magnet synchronous motor.

[0016] Specifically, in the drive assembly, the output end of the energy source 1 is electrically connected to the power supply end of the motor controller 2, and the output end of the motor controller 2 is electrically connected to the control end of the motor 3. The output end of the vehicle controller 5 is electrically connected to the input end of the motor controller 2, forming a complete control loop. This connection method enables the vehicle controller 5 to accurately adjust the operating state of the motor through the motor controller 2 according to the needs of the system, and then drive the hydraulic pump to work, thereby achieving precise control of the hydraulic system.

[0017] Among them, the energy source 1 can be a combination of a battery pack and a battery management system, or a combination of a power grid and a rectifier. This design enables the system to flexibly adapt to different application scenarios and energy supply conditions. The motor 3 adopts a permanent magnet synchronous motor, which has high efficiency, high power density and good dynamic response performance, and can better meet the high requirements of electric engineering machinery for power sources. By optimizing the collaborative working mode of the motor and the hydraulic pump, not only the overall efficiency of the system is improved, but also the dynamic response performance is significantly improved, which can better adapt to the complex and changeable working conditions of engineering machinery.

[0018] It should be noted that in other embodiments, other types of energy sources 1 and motors 3 may also be used, which are not specifically limited here, but these solutions are within the protection scope of the present invention.

[0019] Preferably, the hydraulic assembly includes a hydraulic pump 4, a hydraulic valve 8, and a cylinder 9, wherein the motor 3 is coaxially mechanically connected to the hydraulic pump 4, the input end of the hydraulic pump 4 is used to connect to the hydraulic oil tank, the oil outlet of the hydraulic pump 4 is connected to the hydraulic valve 8, the hydraulic valve 8 is connected to the cylinder 9, and the output end of the vehicle controller 5 is electrically connected to the input end of the hydraulic pump 4.

[0020] Preferably, the hydraulic pump 4 is an axial piston variable displacement pump with electric proportional displacement control.

[0021] Specifically, in this embodiment, the configuration and operation mechanism of the hydraulic component are the key parts to achieve efficient flow matching control. Among them, the hydraulic pump 4 is connected to the motor 3 through a coaxial mechanical connection to ensure that the power can be efficiently and directly transmitted. The input end of the hydraulic pump 4 is connected to the hydraulic oil tank to obtain hydraulic oil from the tank, and the oil outlet of the hydraulic pump 4 is connected to the hydraulic valve. The hydraulic valve 8 is further connected to the cylinder 9 to achieve precise control of the cylinder action by controlling the flow direction and flow of the hydraulic oil. The output end of the vehicle controller 5 is electrically connected to the input end of the hydraulic pump 4, so that the vehicle controller 5 can dynamically adjust the displacement of the hydraulic pump 4 according to system requirements. In short, the electric energy of the energy source 1 provides high-voltage direct current to the motor controller 2, and the motor controller 2 inverts the direct current into three-phase electricity to power the motor 3, and the motor 3 drives the hydraulic pump 4 to work through a spline connection.

[0022] Among them, the hydraulic pump 4 adopts an axial piston variable pump with electric proportional displacement control, which has significant advantages. First, it can flexibly adjust the displacement according to system requirements, so as to achieve precise control of the flow of the hydraulic system, wherein the hydraulic system can be a negative flow system, a positive flow system, and a load-sensitive system, etc. Secondly, the structural design of the axial piston variable pump enables it to maintain a high efficiency under different working conditions, especially under large displacement and high pressure, which can effectively reduce energy loss. In addition, the electric proportional displacement control technology makes the displacement adjustment of the hydraulic pump 4 faster and more accurate, can better adapt to the rapid changes in load flow, and further improve the dynamic response performance of the system. It should be noted that in other embodiments, other types of hydraulic pumps 4 can also be used, which are not specifically limited here, but these schemes are within the scope of protection of the present invention.

[0023] Preferably, the sensor assembly includes a pressure sensor 6 and a flow meter 7 arranged on the circuit of the hydraulic pump 4 and the hydraulic valve 8, wherein the output end of the pressure sensor 6 and the output end of the flow meter 7 are electrically connected to the input end of the vehicle controller 5.

[0024] In this embodiment, the sensor assembly mainly includes a pressure sensor 6 and a flow meter 7, which are arranged on the circuit of the hydraulic pump 4 and the hydraulic valve 8, and are used to monitor the key operating parameters of the hydraulic system in real time. The output end of the pressure sensor 6 and the output end of the flow meter 7 are both electrically connected to the input end of the vehicle controller 5, so that the monitored pressure and flow data are fed back to the vehicle controller 5 in real time. This configuration enables the vehicle controller 5 to obtain real-time information on the operation of the hydraulic system and provide accurate data support for subsequent control decisions. The pressure sensor 6 is used to monitor the pressure at the outlet of the hydraulic pump 4. This parameter directly reflects the workload and pressure state of the hydraulic system. The flow meter 7 is used to measure the flow at the outlet of the hydraulic pump 4. The flow is another key parameter in the hydraulic system, which directly affects the action speed and power output of the hydraulic actuator (such as the cylinder). By monitoring the pressure and flow at the same time, the vehicle controller 5 can fully understand the operating status of the hydraulic system, thereby achieving more precise control.

[0025] Specifically, during the actual operation, when the hydraulic system starts to work, the pressure sensor 6 and the flow meter 7 will monitor the pressure and flow at the outlet of the hydraulic pump 4 in real time, and transmit these data to the vehicle controller 5. Based on these data, the vehicle controller 5 combines the efficiency model of the motor and the hydraulic pump 4, and dynamically adjusts the speed of the motor and the displacement of the hydraulic pump 4 through optimization algorithm and weighted processing to achieve the best match with the system flow demand. This dynamic adjustment method based on real-time data can not only ensure that the power source always operates in the high-efficiency range, but also effectively respond to the rapid changes in load flow and improve the dynamic response performance of the system.

[0026] In addition, this sensor configuration also brings significant beneficial effects. First, by accurately monitoring pressure and flow, the system can avoid equipment damage or reduced work efficiency caused by excessive pressure or insufficient flow, thereby improving the reliability and service life of the equipment. Second, real-time data feedback enables the vehicle controller to detect abnormal conditions in a timely manner and make adjustments, further improving the safety and stability of the system. For example, when the pressure sensor 6 detects that the outlet pressure of the hydraulic pump 4 is abnormally increased, the vehicle controller 5 can quickly adjust the displacement of the hydraulic pump or reduce the motor speed to prevent the hydraulic system from overloading and protect the equipment from damage.

[0027] See also Figure 2 The vehicle controller is configured to implement the following steps by executing a computer program stored therein: S1, obtaining the pump outlet pressure collected by the sensor assembly p and pump outlet flow q , and set the displacement in the program V , calculate the corresponding speed , the pump output power , the pump input power , motor torque ,in, is the overall efficiency of the pump; Specifically, in this embodiment, first, the preset target flow rate and displacement are obtained. V , and the pump outlet pressure collected by the sensor assembly p and pump outlet flow q ; Calculate the target flow rate based on the input signal of the handle, the actuator pilot pressure and other related parameters. The determined target flow rate can be achieved through different speed-displacement combinations.

[0028] The vehicle controller 5 first uses the pump outlet pressure p and pump outlet flow q , the speed n of the hydraulic pump is calculated by a preset mathematical model or table lookup method. Then, the vehicle controller 5 calculates the speed n of the hydraulic pump according to the speed n and pump outlet pressure p , calculate the power of the hydraulic pump P and torque T These calculation results provide basic data for subsequent optimization control.

[0029] Specifically, the pump outlet pressure collected by the sensor assembly is obtained. p and pump outlet flow q ; Set displacement in program V , calculate the corresponding n , , and thus calculate the pump output power , ; Further, combined with the efficiency of the pump , the pump input power can be calculated , ; Due to the motor output power , so the motor torque can be calculated T , .

[0030] S2, the speed n , torque T , Pump outlet pressure p , Pump outlet flow q Input into the preset motor efficiency model and hydraulic pump efficiency model to calculate the motor efficiency and hydraulic pump efficiency ; Specifically, step S2 includes: n , torque T Import into the preset motor efficiency model to calculate and generate motor efficiency , the formula is =( T , n ); The pump outlet pressure p , Pump outlet flow q and speed n Import into the preset hydraulic pump efficiency model to calculate and generate the hydraulic pump efficiency , the formula is =( p , q , n ).

[0031] Specifically, in this embodiment, the vehicle controller sets the speed n and torque T Import into the preset motor efficiency model to calculate and generate motor efficiency The motor efficiency model is based on the motor characteristic curve and experimental data, and can accurately reflect the motor efficiency under different working conditions. By calculating the motor efficiency, the vehicle controller 5 can understand the current working efficiency of the motor and provide a basis for subsequent optimization control. p , Pump outlet flow q and speed n Import into the preset hydraulic pump efficiency model to calculate and generate the hydraulic pump efficiency The hydraulic pump efficiency model is also based on the characteristic curve and experimental data of the hydraulic pump, and can accurately reflect the efficiency of the hydraulic pump under different working conditions; by calculating the hydraulic pump efficiency, the vehicle controller 5 can understand the current working efficiency of the hydraulic pump and provide a basis for subsequent optimization control.

[0032] Through the above steps, the vehicle controller 5 can grasp the working efficiency of the motor and hydraulic pump 4 in real time, and make dynamic adjustments based on these efficiency data. This dynamic adjustment method based on real-time data can not only ensure that the power source always operates in the high-efficiency range, but also effectively cope with the rapid changes in load flow and improve the dynamic response performance of the system. Through real-time calculation and dynamic adjustment, the vehicle controller 5 can ensure that the motor and hydraulic pump operate under the best working conditions, maximize system efficiency and reduce energy waste. Real-time acquisition and calculation of key parameters enable the vehicle controller 5 to respond quickly to load changes and maintain the stability and reliability of the system. By accurately controlling the pressure and flow of the hydraulic system, equipment damage caused by overload or underload can be avoided and the service life of the equipment can be extended. Real-time monitoring and adjustment of the system operation status can promptly detect and handle abnormal situations and improve the safety of the system.

[0033] In practical applications, the vehicle controller can not only control according to the preset target flow and displacement, but also make adaptive adjustments according to the actual working conditions. For example, when the system detects a sudden increase in load, the vehicle controller 5 can quickly adjust the displacement of the hydraulic pump and the speed of the motor to meet the new flow requirements and ensure the smooth operation of the system.

[0034] S3, the motor efficiency and hydraulic pump efficiency Optimization weighted preprocessing is performed to calculate the optimal solution of the speed-displacement combination, and the drive component and the hydraulic component are adjusted and controlled according to the optimal solution of the speed-displacement combination.

[0035] Specifically, step S3 includes: using a preset optimization algorithm to optimize the motor efficiency and hydraulic pump efficiency Perform optimization algorithm solution and weighted processing to obtain n comprehensive efficiency values ​​and generate the comprehensive efficiency of the power source ; Wherein, the optimization algorithm is a genetic algorithm, a particle swarm algorithm or an ant colony algorithm; The top m comprehensive efficiency values ​​are selected and weighted to obtain the optimal solution of the speed-displacement combination.

[0036] The speed-displacement combination is optimally solved to obtain the target displacement in the VCU V t The signal is sent to the hydraulic pump to adjust the pump displacement; The target speed in the optimal solution of the speed-displacement combination is n t The signal is sent to the motor controller to adjust the motor speed.

[0037] In this embodiment, after the calculation of the motor efficiency and the hydraulic pump efficiency is completed, step S3 is entered to perform weighted preprocessing on the motor efficiency and the hydraulic pump efficiency to calculate the optimal solution of the speed-displacement combination, and the drive component and the hydraulic component are adjusted and controlled according to the optimal solution. Specifically, a preset optimization algorithm is first used to perform optimization algorithm solution and weighted processing on the motor efficiency and the hydraulic pump efficiency. The optimization algorithm can be a genetic algorithm, a particle swarm algorithm or an ant colony algorithm, etc., which have good performance and wide application in optimization problems. Through these algorithms, the vehicle controller can solve multiple comprehensive efficiency values, that is, n speed-displacement combinations, to generate the comprehensive efficiency of the power source. These comprehensive efficiency values ​​reflect the overall efficiency of the motor and the hydraulic pump working together under different speed and displacement combinations. It should be noted that in other embodiments, other types of optimization algorithms can also be used, which are not specifically limited here, but these schemes are all within the scope of protection of the present invention.

[0038] After solving and obtaining multiple comprehensive efficiency values, the top m comprehensive efficiency values ​​are selected and weighted. The purpose of weighted processing is to comprehensively consider the efficiency performance under different working conditions, avoid the one-sidedness of a single efficiency value, and thus obtain a more reliable speed-displacement combination optimal solution. This optimal solution can ensure that in actual operation, the motor and the hydraulic pump 4 can work together in the high-efficiency range, while taking into account the dynamic response and stability of the system.

[0039] Further, after obtaining the optimal solution of the speed-displacement combination, the vehicle controller 5 sets the target displacement in the optimal solution V t The signal is sent to the hydraulic pump to adjust the pump displacement; at the same time, the target speed in the optimal solution is n t The signal is sent to the motor controller to adjust the motor speed. In this way, the vehicle controller can accurately control the displacement of the hydraulic pump and the speed of the motor, so that the system always remains in the optimal state during operation.

[0040] This control strategy based on optimal weighted preprocessing can not only significantly improve the overall efficiency of the system, but also effectively cope with the rapid changes in load flow and enhance the dynamic response capability of the system. Through precise speed and displacement adjustment, the system can maintain efficient operation under different working conditions, reduce energy waste, and extend the service life of the equipment. At the same time, real-time optimization and adjustment also improve the reliability and safety of the system and reduce the maintenance cost of the equipment.

[0041] In summary, the flow matching control system aims to achieve efficient operation and precise flow control of the power source by optimizing the collaborative working mode of the motor and the hydraulic pump, thereby significantly improving the overall efficiency and dynamic response performance of the system. The system calculates the corresponding speed, power and torque by obtaining the preset target flow, displacement and the pump outlet pressure and flow collected by the sensor component. Subsequently, these parameters are input into the motor efficiency model and the hydraulic pump efficiency model to calculate and generate the motor efficiency and the hydraulic pump efficiency. The efficiency data is solved and weighted by an optimization algorithm (such as a genetic algorithm, a particle swarm algorithm or an ant colony algorithm) to generate the comprehensive efficiency of the power source, and several combinations with the highest comprehensive efficiency are selected for weighted processing, and finally the optimal solution of the speed-displacement combination is obtained. The vehicle controller 5 sends a control signal to the motor controller and the hydraulic pump according to the optimal solution to achieve precise regulation of the motor speed and the hydraulic pump displacement.

[0042] This flow matching control method based on the efficiency model can not only ensure that the power source always operates in the high-efficiency range, but also effectively cope with the rapid changes in load flow, significantly improving the dynamic response performance of the system. Through precise speed and displacement adjustment, the system can maintain efficient operation under different working conditions, reduce energy waste, and reduce operating costs. At the same time, real-time optimization and adjustment also improve the reliability and safety of the system and extend the service life of the equipment. In addition, this control strategy also has good adaptive capabilities and can be dynamically adjusted according to actual working conditions to better adapt to complex and changeable construction machinery working conditions. Efficient operation and precise control of the power source of electric construction machinery are achieved.

[0043] A second embodiment of the present invention provides an electric engineering machine, which comprises an electric engineering machine body and a flow matching control system as described in any one of the above, wherein the flow matching control system is configured on the electric engineering machine body.

[0044] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A flow matching control system, characterized in that: include: A drive assembly, a hydraulic assembly, a vehicle controller, and a sensor assembly, wherein the output end of the drive assembly is coaxially mechanically connected to the input end of the hydraulic assembly, the input end of the hydraulic assembly is used to connect to a hydraulic oil tank, the sensor assembly is arranged on a circuit of the hydraulic assembly, the output end of the sensor assembly is electrically connected to the input end of the vehicle controller, and the output end of the vehicle controller is electrically connected to the input end of the drive assembly and the input end of the hydraulic assembly; The vehicle controller is configured to implement the following steps by executing a computer program stored therein: Obtain the pump outlet pressure collected by the sensor assembly p and pump outlet flow q , and set the displacement in the program V , calculate the corresponding speed , pump output power , the pump input power , motor torque ,in, is the overall efficiency of the pump; The speed n , torque T , Pump outlet pressure p , Pump outlet flow q Input into the preset motor efficiency model and hydraulic pump efficiency model to calculate the motor efficiency and hydraulic pump efficiency ; The motor efficiency and hydraulic pump efficiency An optimization algorithm is performed to solve and weighted processing is performed to calculate the optimal solution of the speed-displacement combination, and the drive component and the hydraulic component are adjusted and controlled according to the optimal solution of the speed-displacement combination.

2. The flow matching control system according to claim 1, characterized in that: The driving component includes an energy source, a motor controller, and an electric motor, wherein the output end of the energy source is electrically connected to the input end of the motor controller, the output end of the motor controller is electrically connected to the input end of the electric motor, and the output end of the vehicle controller is electrically connected to the input end of the motor controller.

3. The flow matching control system according to claim 2, characterized in that: The energy source is a combination of a battery pack and a battery management system or a combination of a power grid and a rectifier, and the motor is a permanent magnet synchronous motor.

4. The flow matching control system according to claim 2, characterized in that: The hydraulic assembly includes a hydraulic pump, a hydraulic valve, and a cylinder, wherein the electric motor is coaxially mechanically connected to the hydraulic pump, the input end of the hydraulic pump is used to connect to the hydraulic oil tank, the oil outlet of the hydraulic pump is connected to the hydraulic valve, the hydraulic valve is connected to the cylinder, and the output end of the vehicle controller is electrically connected to the input end of the hydraulic pump.

5. The flow matching control system according to claim 4, characterized in that: The hydraulic pump is an axial piston variable displacement pump with electric proportional displacement control.

6. The flow matching control system according to claim 4, characterized in that: The sensor assembly includes a pressure sensor and a flow meter arranged on the circuit of the hydraulic pump and the hydraulic valve, wherein the output end of the pressure sensor and the output end of the flow meter are electrically connected to the input end of the vehicle controller.

7. The flow matching control system according to claim 1, characterized in that: The speed n, torque T, pump outlet pressure p , Pump outlet flow q Input into the preset motor efficiency model and hydraulic pump efficiency model to calculate the motor efficiency and hydraulic pump efficiency , specifically: The speed n , torque T Import into the preset motor efficiency model to calculate and generate motor efficiency , the formula is =( T , n ); The pump outlet pressure p , Pump outlet flow q and speed n Import into the preset hydraulic pump efficiency model to calculate and generate the hydraulic pump efficiency , the formula is =( p , q , n ).

8. The flow matching control system according to claim 1, characterized in that: The motor efficiency and hydraulic pump efficiency Perform optimization weighted preprocessing to calculate the optimal solution of the speed-displacement combination, specifically: The motor efficiency is calculated by using a preset optimization algorithm. and hydraulic pump efficiency Perform optimization algorithm solution and weighted processing to obtain n comprehensive efficiency values ​​and generate the comprehensive efficiency 𝜂 of the power source; Wherein, the optimization algorithm is a genetic algorithm, a particle swarm algorithm or an ant colony algorithm; The top m comprehensive efficiency values ​​are selected and weighted to obtain the optimal solution of the speed-displacement combination.

9. The flow matching control system according to claim 4, characterized in that: The drive assembly and the hydraulic assembly are regulated and controlled according to the optimal solution of the speed-displacement combination, specifically: The target displacement in the optimal solution of the speed-displacement combination is V t The signal is sent to the hydraulic pump to adjust the pump displacement; The target speed in the optimal solution of the speed-displacement combination is n t The signal is sent to the motor controller to adjust the motor speed.

10. An electric engineering machine, characterized in that: It comprises an electric engineering machine body and a flow matching control system as claimed in any one of claims 1 to 9, wherein the flow matching control system is arranged on the electric engineering machine body.

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