Battery capacity calculation method and system for extended-range excavator

Abstract

The invention discloses a battery capacity calculation method and system for an extended-range excavator, and the method comprises the steps: obtaining the battery charging and discharging parameters of the extended-range excavator and the operation parameters of the extended-range excavator; according to the obtained battery charging and discharging parameters of the extended-range excavator and the obtained operation parameters of the extended-range excavator, the power capable of being generated by a range extender of the extended-range excavator and the average power consumed by driving of a driving motor are calculated; calculating the continuous power generation power of the range extender according to the calculated power capable of being generated by the range extender and the average power consumed by driving of the driving motor; and calculating the battery capacity required by the extended range excavator according to the continuous power generation power of the range extender and the energy conservation law. According to the method, the battery capacity of the extended-range excavator is accurately calculated in an energy conservation manner, so that the risks of testing instability caused by too small battery capacity selection and damage to the service life of the battery caused by frequent reaching of a battery peak value are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of extended-range engineering machinery, and in particular to a battery capacity calculation method and system for an extended-range excavator. Background Art

[0002] Extended-range excavators, powered by a range extender (such as a methanol range extender) and batteries, can effectively reduce the energy consumption and emissions of traditional fuel-powered excavators. However, during operation, excavator load power fluctuates frequently and significantly (for example, a 75t excavator can experience power fluctuations of 40-370kW). The methanol range extender's power output response lags, making it unable to quickly adapt to instantaneous changes in load demand.

[0003] Existing range extender solutions mostly adopt a "power following strategy," where the range extender follows the load power output in real time. However, this solution has the following drawbacks:

[0004] Poor alcohol consumption economy: The range extender frequently adjusts power to follow fluctuations, resulting in reduced combustion efficiency and increased methanol consumption; Insufficient adaptability: When the battery SOC (state of charge) is too low or the ambient temperature is abnormal, the battery charging and discharging capacity decreases, and the range extender cannot respond to load demands in a timely manner, resulting in system "mismatch"; There is a high stability risk problem: The operating condition oscillation caused by load fluctuations will cause the battery to frequently perform peak charging and discharging, shortening the battery life, and affecting the stability of the electronic control system (such as BMS, VCU). Summary of the Invention

[0005] In order to solve some or all of the technical problems existing in the above-mentioned prior art, the present invention provides a battery capacity calculation method and system for an extended-range excavator, which avoids the test instability caused by selecting too small a battery capacity and the risk of damaging the battery life due to frequent reaching of the battery peak.

[0006] The technical solutions of the present invention are as follows:

[0007] In a first aspect, a method for calculating the battery capacity of an extended-range excavator is provided, comprising:

[0008] Obtain battery charge and discharge parameters and operating parameters of the extended-range excavator;

[0009] Calculate the power that can be generated by the range extender of the extended-range excavator and the average power consumed by the drive motor based on the obtained battery charge and discharge parameters of the extended-range excavator and the operating parameters of the extended-range excavator;

[0010] Calculate the continuous power generation of the range extender based on the calculated power that the range extender can generate and the average power consumed by the drive motor;

[0011] Based on the range extender's continuous power generation and the law of conservation of energy, calculate the battery capacity required for the extended-range excavator.

[0012] Furthermore, in the above-mentioned method for calculating the battery capacity of an extended-range excavator, the battery charging and discharging parameters of the extended-range excavator include the total current of the battery pack and the output voltage of the battery pack.

[0013] Furthermore, in the above-mentioned method for calculating the battery capacity of an extended-range excavator, the operating parameters of the extended-range excavator include the output torque of the drive motor, the speed of the drive motor, the DCDC operating parameters, the TMS operating parameters and the AC operating parameters.

[0014] Furthermore, in the above-mentioned method for calculating the battery capacity of an extended-range excavator, the power that can be generated by the range extender is calculated using the following formula:

[0015] Pe=Pb+Pm+Pa;

[0016] Among them, Pe represents the power that the range extender can generate, Pb represents the continuous charging and discharging power of the battery, Pm represents the power consumption of the drive motor, and Pa represents the power consumption of the extended-range excavator accessories.

[0017] Furthermore, in the above-mentioned method for calculating the battery capacity of an extended-range excavator, the continuous charge and discharge power of the battery is calculated and determined by the following formula:

[0018] Pb=Ib×Ub;

[0019] Among them, Ib represents the total current of the battery pack, and Ub represents the output voltage of the battery pack.

[0020] Furthermore, in the above-mentioned method for calculating the battery capacity of an extended-range excavator, the driving power consumption of the driving motor is calculated and determined by the following formula:

[0021] Pm=(Tm×Sm) / 9550;

[0022] Wherein, Tm represents the output torque of the drive motor, and Sm represents the current speed of the drive motor.

[0023] Furthermore, in the above-mentioned method for calculating the battery capacity of an extended-range excavator, the power consumption of the accessories of the extended-range excavator is calculated by the following formula:

[0024] Pa = TMS power consumption + DCDC power consumption + AC power consumption;

[0025] Among them, TMS power consumption represents the power consumption of the power battery cooling system in the extended-range excavator, DCDC power consumption represents the power consumption of the DCDC controller in the extended-range excavator, and AC power consumption represents the power consumption of the electric air-conditioning system in the extended-range excavator.

[0026] Furthermore, in the above-mentioned method for calculating the battery capacity of an extended-range excavator, the continuous power generation power of the range extender is calculated and determined by the following formula:

[0027] PeAPU=PmAvg+Pa;

[0028] Among them, PeAPU represents the continuous power generation of the range extender, and PmAvg represents the average power consumed by the drive motor.

[0029] In a second aspect, a battery capacity calculation system for an extended-range excavator is provided, comprising:

[0030] A parameter acquisition module, the parameter acquisition module is used to obtain battery charging and discharging parameters of the extended-range excavator and operating parameters of the extended-range excavator;

[0031] A first calculation module, configured to calculate the power that can be generated by the range extender and the average power consumed by the drive motor in the extended-range excavator based on the acquired battery charge and discharge parameters and operating parameters of the extended-range excavator;

[0032] a second calculation module, the second calculation module being used to calculate the continuous power generation of the range extender based on the calculated power that the range extender can generate and the average power consumed by the drive motor;

[0033] A battery capacity calculation module is used to calculate the battery capacity required for the extended-range excavator based on the continuous power generation power of the range extender and the law of conservation of energy.

[0034] The main advantages of the technical solution of the present invention are as follows:

[0035] The present invention provides a method and system for calculating the battery capacity of an extended-range excavator, which accurately calculates the battery capacity of the extended-range excavator in an energy conservation manner, avoiding test instability caused by selecting too small a battery capacity and the risk of damaging the battery life due to frequent reaching of the battery peak. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings described herein are used to provide a further understanding of the embodiments of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0037] Figure 1 A schematic flow chart of a method for calculating battery capacity of a range-extended excavator provided in one embodiment of the present invention;

[0038] Figure 2A diagram showing the working principle of an extended-range excavator in a method for calculating the battery capacity of an extended-range excavator provided in one embodiment of the present invention;

[0039] Figure 3 A statistical graph of charge and discharge capacity data of a battery of an extended-range excavator in different state of charge (SOC) intervals in a first temperature interval in a method for calculating battery capacity of an extended-range excavator provided by one embodiment of the present invention;

[0040] Figure 4 A statistical graph of charge and discharge capacity data of a battery of an extended-range excavator in different state of charge (SOC) intervals in a second temperature interval in a method for calculating battery capacity of an extended-range excavator provided by one embodiment of the present invention;

[0041] Figure 5 A schematic diagram of actual load fluctuations of an extended-range excavator in a battery capacity calculation method for an extended-range excavator provided in one embodiment of the present invention.

[0042] Description of reference numerals:

[0043] 10. Parameter acquisition module; 20. First calculation module; 30. Second calculation module; 40. Battery capacity calculation module. DETAILED DESCRIPTION

[0044] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] The following is combined with Figure 1 -Attached Figure 5 , describes in detail the technical solution provided by the embodiments of the present invention.

[0046] As attached Figure 1 As shown, an embodiment of the present invention provides a method for calculating the battery capacity of an extended-range excavator, the method comprising the following steps S1 to S4:

[0047] Step S1: Obtain battery charge and discharge parameters of the extended-range excavator and operating parameters of the extended-range excavator.

[0048] In some optional implementations of this embodiment, the battery charging and discharging parameters of the extended-range excavator include the total current of the battery pack and the output voltage of the battery pack; the operating parameters of the extended-range excavator include the output torque of the drive motor, the speed of the drive motor, the DCDC operating parameters, the TMS operating parameters and the AC operating parameters.

[0049] Because excavator power fluctuates frequently and significantly during operation, the methanol range extender cannot respond quickly to load demands. Fluctuations require the battery's ability to discharge and recharge. Therefore, the calculation strategy prioritizes battery SOC, supplemented by power demand. This avoids operating fluctuations that can cause short-term tests of battery and electronic control stability. Therefore, a power consumption and threshold control strategy is adopted. This means that the range extender system only considers the power battery's charge level and battery consumption slope, and only adjusts the performance strategy based on the excavator's power demand.

[0050] The distributed range-extended powertrain system primarily consists of an internal combustion engine (ICE), an integrated starter / generator (ISG), a regenerative control unit (RCU), and an engine control system (EMS). The EMS is primarily responsible for engine operation, while the RCU oversees the ISG. The control strategy for the range-extended powertrain system varies depending on the EEA of each company. For example, relevant strategy models can be placed in the EMS, RCU, VCU, or power domain to form range-extended powertrain systems with different electrical architectures.

[0051] Since the power of the excavator fluctuates frequently and greatly during operation, and the methanol range extender cannot respond quickly according to the load demand, the battery discharge and charging capacity is required during the fluctuation process, so the calculation strategy is based on the battery SOC, supplemented by the required power to avoid operating condition fluctuations, which lead to short-term testing of battery and electronic control stability. Therefore, the power consumption and threshold control method is adopted, that is, the range extender power system only focuses on the power of the power battery and the battery consumption slope, and the power demand of the excavator, and only makes performance adjustments to the battery application. The connection relationship between the various elements and components involved in the embodiments of the present invention is as follows. Figure 2 As shown, the following Figure 2 The functions of the components shown in FIG.

[0052] The Generator Control Unit (GCU) controls a diesel generator, such as the range extender in a hybrid system. It dynamically adjusts power generation according to BMS requirements. For example, it starts generating power when the SOC is less than 20%, maintaining output voltage fluctuations within ±2% to protect the battery while keeping the diesel engine operating in a high-efficiency range, such as 1500 rpm.

[0053] An Energy Management System (EMS) is a power management system for low-voltage distribution systems, developed based on user needs and in compliance with distribution system standards. It features high professionalism, automation, ease of use, high performance, and reliability. Through telemetry and remote control, it enables rational load allocation, optimized operation, and effective energy conservation. It also records peak and off-peak electricity usage, providing the necessary conditions for energy management.

[0054] A Power Distribution Unit (PDU), also known as a power distribution outlet for cabinets, is designed to distribute power to cabinet-mounted electrical equipment. Available in a variety of specifications with varying functions, installation methods, and socket combinations, PDUs provide suitable rack-mount power distribution solutions for diverse power supply environments. The use of PDUs can make power distribution within the cabinet more organized, reliable, secure, professional, and aesthetically pleasing, while also making maintenance of the cabinet's power supply more convenient and reliable.

[0055] TMS stands for power battery cooling system, which is used to regulate the operating temperature of the battery pack, electronic control and motor to maintain them in the optimal state.

[0056] The Vehicle Control Unit (VCU) is the core control unit of the excavator's control system. As the excavator's control and management center, the VCU primarily consists of hardware and software. The hardware includes the housing and hardware circuitry, while the software is divided into application software and underlying software. The hardware provides the physical platform for the software to operate, while the software imbues the hardware with "intelligence," enabling it to operate according to predetermined logic. Both are essential and together constitute a complete VCU control system. The VCU's main functions include: drive torque control, optimized braking energy control, vehicle energy management, charging management, communication and network management, fault diagnosis and handling, and vehicle status monitoring. It plays a role in controlling vehicle operation.

[0057] The Battery Management System (BMS) is mainly used to intelligently manage and maintain each battery unit, monitor the battery status, prevent the battery from overcharging and over-discharging, and extend the battery life. The BMS unit includes a BMS, a control module, a display module, a wireless communication module, electrical equipment, a battery pack for powering the electrical equipment, and a collection module for collecting battery pack information. The BMS is connected to the wireless communication module and the display module through communication interfaces. The output of the collection module is connected to the input of the BMS, and the output of the BMS is connected to the input of the control module. The control module is connected to the battery pack and electrical equipment respectively. The BMS is connected to the server through a wireless communication module.

[0058] Combine Figure 2 , its energy workflow is as follows: when the power battery SOC value drops to the set threshold, the system starts the range extender and allows it to enter idle speed, and then controls the range extender to enter the operating condition according to the SOC value to output the corresponding power. Due to physical characteristics, during the operation of the excavator, part of the power output by the range extender will flow to the vehicle application, and the remaining part will be charged into the power battery. As the power battery SOC value increases, the power output of the range extender will also decrease until it reaches the set upper threshold value, and then enters idle speed and stops working. However, in actual working conditions, considering the impact of frequent engine start and stop on the engine life, and the fact that the air-conditioning compressor driven by the engine belt cannot work normally after the engine is turned off, the range extender is kept as close as possible during the operation of the excavator. The power generation power is adjusted according to the power consumption while ensuring the economic efficiency of power generation, so that the battery always remains within the specified SOC range.

[0059] Step S2: Calculate the power that can be generated by the range extender of the extended-range excavator and the average power consumed by the drive motor according to the acquired battery charge and discharge parameters of the extended-range excavator and the operating parameters of the extended-range excavator.

[0060] Specifically, the power that the range extender can generate is calculated using the following formula:

[0061] Pe=Pb+Pm+Pa;

[0062] Among them, Pe represents the power that the range extender can generate, Pb represents the continuous charging and discharging power of the battery, Pm represents the power consumption of the drive motor, and Pa represents the power consumption of the extended-range excavator accessories.

[0063] Specifically, the battery continuous charge and discharge power is calculated and determined by the following formula:

[0064] Pb=Ib×Ub;

[0065] Among them, Ib represents the total current of the battery pack, and Ub represents the output voltage of the battery pack.

[0066] Specifically, the driving power consumption of the driving motor is calculated and determined by the following formula:

[0067] Pm=(Tm×Sm) / 9550;

[0068] Wherein, Tm represents the output torque of the drive motor, and Sm represents the current speed of the drive motor.

[0069] Specifically, the power consumption of the extended-range excavator attachment is calculated using the following formula:

[0070] Pa = TMS power consumption + DCDC power consumption + AC power consumption;

[0071] Among them, TMS power consumption represents the power consumption of the power battery cooling system in the extended-range excavator, DCDC power consumption represents the power consumption of the DCDC controller in the extended-range excavator, and AC power consumption represents the power consumption of the electric air-conditioning system in the extended-range excavator.

[0072] In some optional implementations of the embodiments of the present invention, the average power consumption Pa of the excavator accessories (TMS, DCDC, AC, WPTC, etc.) is calculated, where TMS is about 4.5kW, DCDC is a maximum of 4.5kW, AC is about 2kW, and WPTC is about 5kW. The comprehensive average power Pa is determined according to the actual working conditions.

[0073] Step S3: Calculating the continuous power generation of the range extender based on the calculated power that the range extender can generate and the average power consumed by the driving motor;

[0074] Specifically, the continuous power generation of the range extender is calculated and determined by the following formula:

[0075] PeAPU=PmAvg+Pa;

[0076] Among them, PeAPU represents the continuous power generation of the range extender, and PmAvg represents the average power consumed by the drive motor.

[0077] In an embodiment of the present invention, in order to avoid the battery power being too low, the range extender's power generation power is slightly greater than the range extender's continuous power generation power PeAPU in actual control (for example, for a 75t-class excavator, the average power is calculated as 220kW, and the range extender's power generation power is reserved for a response deviation based on 220kW). Therefore, the actual operating load power data of the extended-range excavator (such as the 75t-class) is collected, its power fluctuation range (40-370kW) is counted, and the average power consumption PmAvg of the drive motor is calculated.

[0078] In the implementation of the present invention, the electric power limit value is calculated and determined by the following formula:

[0079] PeMAXLimt = Pb + PmAvg + Pa

[0080] wherein PeMAXLimt represents the electric power limit value, and PmAvg represents the average power consumed by the driving motor.

[0081] In summary, in combination with the above formula, in order to maintain the energy balance of the vehicle, it can be concluded that the continuous power generated by the range extender is PeAPU = PmAvg + Pa.

[0082] Step S4: According to the continuous power generated by the range extender and the law of conservation of energy, the required battery capacity of the range extender excavator is calculated.

[0083] Specifically, according to the continuous power generated by the range extender and the law of conservation of energy, in order to maintain the energy balance of the vehicle, the required battery capacity of the range extender excavator is calculated as the continuous power generated by the range extender, i.e. PeAPU = PmAvg + Pa.

[0084] The steady-state power generation state of the range extender is balanced by the positive torque output by the engine overcoming the frictional resistance of the engine and accessories + the negative torque output by the generator. Since the basic principle of air-fuel ratio (N: 1) control is followed in engine control, i.e. N parts of air per unit time must be injected with 1 part of fuel to avoid abnormal conditions such as engine knock, the intake amount is determined by the engine piston stroke in a short time, i.e. the engine speed.

[0085] However, it should be noted that the ignition angle can reduce the torque to a certain extent, but generally can only reduce to about 70% of the optimal ignition angle torque, and generally commercial engines do not support ignition angle torque control.

[0086] In an ideal case, the power generation should meet the condition that the continuous charging and discharging power of the battery + the driving motor driving consumption power + the accessory consumption power is less than or equal to the range extender power generation, which is less than the driving motor driving consumption power + the accessory consumption power, otherwise the battery will be over-discharged or over-charged. In addition, when the range extender power generation is greater than the battery power generation and the battery power is low and cannot provide discharging capacity, in order to maintain energy supply under the condition of meeting the above ideal case, the range extender power generation must be equal to the continuous charging and discharging power of the battery + the driving motor driving consumption power + the accessory consumption power. However, according to the steady-state power generation state of the range extender and the basic principle of air-fuel ratio (N: 1) control in engine control, it can be known that under this condition, the engine must change according to the load change of the driving motor.

[0087] PeMAXLimt = Pb + PmAvg + Pa Figure 3 , Figure 4It can be seen that when the SOC is between 50% and 70%, the battery has the best charge and discharge capabilities (i.e., Region 4). Note: Region 1 is the region with the best charge and discharge capabilities; Region 2 is the region with the best charge and discharge capabilities considering both cell temperature and SOC; Region 3 is the intersection of Regions 1 and 2, where the battery has the highest charge and discharge capabilities.

[0088] Based on the power fluctuation range (40-370kW) and the response lag of the range extender, the battery must cover the instantaneous power difference. For example, the actual battery power range of a 75t excavator is -180kW to 150kW (negative sign indicates charging, positive sign indicates discharging). In extreme cases, it needs to cover -260kW to 70kW. Considering the instantaneous power redundancy requirement of 300kW, a 100kWh battery with a 3C charge and discharge rate is selected (3C rate can support 300kW of instantaneous power).

[0089] For example, taking the 75t extended-range excavator TZ750EM as an example, its actual load fluctuation is as follows: Figure 5 As shown, the power of the 75t extended-range excavator will fluctuate between 40-370kW, and the additional accessory consumption is calculated based on an average power of 220kW. The range extender power generation is also calculated based on 220kW (due to the inevitable deviation in the actual power request, it is calculated based on 220kW in the embodiment of the present invention). The actual battery withstands -180kW to 150kW. In the extreme case of extremely low battery power, the range extender generates power at 300kW, and the battery fluctuation range is -260 to 70kW. In order to prevent the battery from being too low in power, the range extender needs to generate power slightly greater than the average required power, so the actual battery needs to withstand -300kW to 300kW. In summary, it is most appropriate to choose a 100kWh battery with a continuous discharge rate of 3C. At the same time, the program for the subsequent power generation request of the range extender needs to be continuously optimized according to the actual working conditions to reduce the pressure on the battery and extend the battery life.

[0090] For example, taking the TZ750EM 75t extended-range excavator as an example, the specific implementation steps and calculation method include:

[0091] Load power acquisition: The load power of the excavator during actual operation is collected through sensors, and its fluctuation range is determined to be 40-370kW. The average power of the drive motor is calculated as PmAvg = 200kW.

[0092] Accessory power calculation: Calculate the accessory power consumption, where TMS = 4.5kW, DCDC = 4.5kW, AC = 2kW, WPTC = 5kW, and the average accessory power Pa = 16kW (actually optimized to 20kW based on working conditions).

[0093] Determination of range extender power: According to PeAPU = PmAvg + Pa, PeAPU = 220kW; considering the response deviation, the actual power generation power of the range extender is set to 220-230kW.

[0094] Battery parameter selection: The maximum power fluctuation difference is 370-220=150kW (discharge) and 220-40=180kW (charge). Extreme operating conditions need to cover -260kW to 70kW. Combined with the 300kW redundancy requirement, a 100kWh battery with a 3C charge and discharge rate (3C×100kWh=300kW) is selected.

[0095] Therefore, in the embodiment of the present invention, a power consumption and threshold control method based on battery SOC as the primary factor and power demand as the secondary factor is adopted, including:

[0096] The battery SOC threshold is set to 50%-70%. When the battery SOC is higher than the preset threshold (such as 70%), that is, when SOC ≥ 70%, the battery power is consumed first to match the load fluctuation, and the range extender maintains PeAPU output; when the battery SOC is lower than the preset threshold (such as 50%), that is, when SOC ≤ 50%, the range extender increases the power generation to supplement the battery power. For example, the range extender increases the power generation to 230kW to supplement the power, and coordinates with the EMS, RCU and power domain controller to achieve stable operation and avoid response failure caused by too low battery SOC.

[0097] In some optional implementations of the present invention, in the extended-range excavator control system, the EMS is responsible for engine operation, while the RCU is responsible for ISG charging and discharging. Control is integrated into the power domain controller, enabling coordinated operation of these components. Testing has shown that this solution reduces alcohol consumption by 15% and extends battery cycle life by 20% compared to traditional power-following solutions. The system also maintains stable response to load fluctuations in temperatures ranging from -10°C to 40°C.

[0098] With such a setting, in the implementation of the present invention, the battery capacity of the TZ750EM extended-range excavator is accurately calculated, thereby avoiding the problem of test instability caused by selecting too small a battery capacity and damage to the battery life caused by frequently reaching the battery peak.

[0099] In summary, in an embodiment of the present invention, in order to solve the problems of poor alcohol consumption, insufficient SOC and temperature adaptability, and low stability of the battery and electronic control system when the extended-range excavator adopts a power following strategy in the prior art, an embodiment of the present invention provides a battery capacity calculation method based on average power and SOC priority control to match the power fluctuation characteristics of the excavator, thereby improving system reliability and economy. Specifically, in an embodiment of the present invention, the rapid charging and discharging capability of the battery is used to buffer the load power fluctuation, the stable output power of the range extender is determined by average power calculation, and the system energy balance is achieved by combining the battery SOC control method, so that the range extender can output stably according to the average power, avoid frequent power adjustments, improve combustion efficiency, and reduce methanol consumption; the battery buffers power fluctuations to avoid operating condition fluctuations, solves the "mismatch" problem when the battery SOC and temperature are too low, and improves the stability of the battery and electronic control system; accurately matches battery capacity and charge and discharge rate to avoid frequent peak charge and discharge, reduce battery loss, and extend battery life; for the power fluctuation of 40-370kW of a 75t excavator, a 3C rate battery is used to achieve instantaneous power coverage to meet the needs of extreme working conditions.

[0100] In a second aspect, an embodiment of the present invention further provides a battery capacity calculation system for an extended-range excavator, the system comprising: a parameter acquisition module 10, a first calculation module 20, a second calculation module 30, and a battery capacity calculation module 40, wherein:

[0101] The parameter acquisition module 10 is used to obtain the battery charging and discharging parameters of the extended-range excavator and the operating parameters of the extended-range excavator; the first calculation module 20 is used to calculate the power that the range extender in the extended-range excavator can generate and the average power consumed by the drive motor based on the acquired battery charging and discharging parameters of the extended-range excavator and the operating parameters of the extended-range excavator; the second calculation module 30 is used to calculate the continuous power generation power of the range extender based on the calculated power that the range extender can generate and the average power consumed by the drive motor; the battery capacity calculation module 40 is used to calculate the battery capacity required for the extended-range excavator based on the continuous power generation power of the range extender and the law of conservation of energy.

[0102] The battery capacity calculation system for the extended-range excavator according to the embodiment of the present invention can solve the problems of poor alcohol consumption, insufficient SOC and temperature adaptability, low stability of the battery and electronic control system, etc. when the extended-range excavator adopts the power following strategy in the prior art. It has the advantages of system stability, high alcohol consumption economy, long battery life and adaptability to large power fluctuations.

[0103] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this document are all referenced to the placement states shown in the accompanying drawings.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for calculating the battery capacity of an extended-range excavator, characterized in that: include: Obtain battery charge and discharge parameters and operating parameters of the extended-range excavator; Calculate the power that can be generated by the range extender of the extended-range excavator and the average power consumed by the drive motor based on the obtained battery charge and discharge parameters of the extended-range excavator and the operating parameters of the extended-range excavator; Calculate the continuous power generation of the range extender based on the calculated power that the range extender can generate and the average power consumed by the drive motor; Based on the range extender's continuous power generation and the law of conservation of energy, calculate the battery capacity required for the extended-range excavator.

2. The method for calculating battery capacity of an extended-range excavator according to claim 1, characterized in that: Battery charging and discharging parameters of extended-range excavators include total battery pack current and battery pack output voltage.

3. The method for calculating battery capacity of an extended-range excavator according to claim 1, characterized in that: The operating parameters of the extended-range excavator include the drive motor output torque, drive motor speed, DCDC operating parameters, TMS operating parameters and AC operating parameters.

4. The method for calculating battery capacity of an extended-range excavator according to claim 1, characterized in that: The power that the range extender can generate is calculated using the following formula: Pe=Pb+Pm+Pa; Among them, Pe represents the power that the range extender can generate, Pb represents the continuous charging and discharging power of the battery, Pm represents the power consumption of the drive motor, and Pa represents the power consumption of the extended-range excavator accessories.

5. The method for calculating battery capacity of an extended-range excavator according to claim 4, characterized in that: The battery continuous charge and discharge power is calculated and determined by the following formula: Pb=Ib×Ub; Among them, Ib represents the total current of the battery pack, and Ub represents the output voltage of the battery pack.

6. The method for calculating battery capacity of an extended-range excavator according to claim 4, characterized in that: The power consumption of the drive motor is calculated using the following formula: Pm=(Tm×Sm) / 9550; Wherein, Tm represents the output torque of the drive motor, and Sm represents the current speed of the drive motor.

7. The method for calculating battery capacity of an extended-range excavator according to claim 4, characterized in that: The power consumption of the extended-range excavator attachment is calculated using the following formula: Pa = TMS power consumption + DCDC power consumption + AC power consumption; Among them, TMS power consumption represents the power consumption of the power battery cooling system in the extended-range excavator, DCDC power consumption represents the power consumption of the DCDC controller in the extended-range excavator, and AC power consumption represents the power consumption of the electric air-conditioning system in the extended-range excavator.

8. The method for calculating battery capacity of a range-extended excavator according to claim 1, characterized in that: The continuous power generation of the range extender is calculated using the following formula: PeAPU=PmAvg+Pa; Among them, PeAPU represents the continuous power generation of the range extender, and PmAvg represents the average power consumed by the drive motor.

9. A battery capacity calculation system for an extended-range excavator, characterized in that: include: A parameter acquisition module, the parameter acquisition module is used to obtain battery charging and discharging parameters of the extended-range excavator and operating parameters of the extended-range excavator; A first calculation module, configured to calculate the power that can be generated by the range extender and the average power consumed by the drive motor in the extended-range excavator based on the acquired battery charge and discharge parameters and operating parameters of the extended-range excavator; a second calculation module, the second calculation module being used to calculate the continuous power generation of the range extender based on the calculated power that the range extender can generate and the average power consumed by the drive motor; A battery capacity calculation module is used to calculate the battery capacity required for the extended-range excavator based on the continuous power generation of the range extender and the law of conservation of energy.

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