Vehicle electric quantity balance analysis and calculation method, device and equipment and vehicle

Abstract

The invention discloses a whole vehicle electric quantity balance analysis and calculation method, device and equipment and a vehicle, and belongs to the technical field of automobile electric appliances. According to the technical scheme, the whole vehicle electric quantity balance analysis and calculation method comprises the following steps that static electric quantity balance calculation is conducted on a whole vehicle, and the capacity of a storage battery is estimated; determining the type of a storage battery and the type of a generator by performing dynamic electric quantity balance calculation on the whole vehicle; comprising the steps that starting current of a storage battery is determined based on parameters of a starting motor according to a starting characteristic curve of a starter, and the type of the storage battery is determined by combining pre-estimated storage battery capacity; according to the use condition, season and use environment of the vehicle, the use frequency coefficient of electric equipment is introduced to calculate the electric load of the whole vehicle, the rated current of the selected generator is estimated, and the type of the generator matched with the storage battery is determined. Various factors such as the use condition, the season and the use environment of the vehicle are considered, and the use frequency coefficient of the electric equipment is introduced, so that the adaptability and the practicability of an analysis result are improved.

Description

Technical Field

[0001] The present invention relates to the field of automobile electrical technology, and in particular to a whole vehicle power balance analysis and calculation method, device, equipment and vehicle. Background Art

[0002] With the development of automotive electronic technology, there are more and more electrical devices on the whole vehicle, which brings more and more pressure to the power supply system of the whole vehicle. In order to ensure the safety and reliability of vehicle operation, the power supply system of the whole vehicle must be reasonably designed to meet the power demand of the electrical equipment of the whole vehicle. The electrical balance of the whole vehicle is to study the balance between the supply and consumption of electrical energy in the whole vehicle power system, that is, the balance of electrical energy generation and consumption between the automobile generator, battery and other various electrical equipment. The battery, starter, generator and whole vehicle electrical appliances are a system of electrical energy supply and demand. The main function of the battery is to supply power to the starter. The generator is the main power supply device in the car. In addition to ensuring the power consumption of the whole vehicle electrical appliances (except the starter) under normal operating conditions, it is also necessary to replenish the battery. Therefore, the reasonable selection of the capacity of the battery and the output power of the generator is a necessary condition to ensure the balance between the power supply and power consumption of the whole vehicle.

[0003] The traditional method of calculating vehicle power balance relies on empirical estimation for the selection of batteries and generators, which leads to problems such as insufficient battery capacity and improper generator selection in actual applications, thus affecting vehicle performance and user experience.

[0004] Especially for traditional fuel vehicles, when faced with complex and changeable vehicle operating conditions, seasonal changes, and differences in usage environment, the traditional power balancing method seems to be unable to cope with it. Summary of the invention

[0005] In view of the problems existing in traditional power balancing methods for traditional fuel vehicles when facing complex and changeable vehicle operating conditions, seasonal changes and differences in operating environment, the present invention provides a whole vehicle power balance analysis and calculation method, device, equipment and vehicle.

[0006] In a first aspect, the technical solution of the present invention provides a vehicle power balance analysis and calculation method, comprising the following steps: Estimate the battery capacity by performing static power balance calculation on the whole vehicle; Determine the battery type and generator type by performing dynamic power balance calculation on the vehicle; including: Determine the starting current of the battery based on the parameters of the starter motor according to the starting characteristic curve of the starter, and determine the battery type in combination with the estimated battery capacity; According to the vehicle's operating conditions, seasons, and usage environment, the frequency coefficient of electrical equipment use is introduced to calculate the vehicle's electrical load, estimate the rated current of the generator, and determine the type of generator that matches the battery.

[0007] The starting current of the battery is determined based on the parameters of the starter motor and the starting characteristic curve of the starter, and the battery type is determined in combination with the estimated battery capacity; at the same time, the rated current of the generator is selected according to the estimated vehicle power load, so as to determine the generator type that matches the battery. This selection method is more scientific and reasonable, and helps to improve vehicle performance and user experience.

[0008] Preferably, the step of estimating the battery capacity by analyzing and calculating the static power balance of the whole vehicle includes: After locking the vehicle, it enters a dormant state. Based on the condition that the cumulative dormant current of all controllers is less than the static current of the entire vehicle, the discharge amount that the battery needs to provide is determined, and the battery capacity is estimated in combination with the reserved charge capacity of the battery.

[0009] By performing a detailed analysis and calculation of the static charge balance of the entire vehicle, the required capacity of the battery can be estimated more accurately. This helps to prevent the battery from being in a state of over-discharge or under-charge for a long time, thereby improving the efficiency and overall life of the battery. This step takes into account the cumulative sum of the sleep currents of all controllers to ensure that when the vehicle is in sleep mode, the discharge amount provided by the battery can meet the static current requirements of the entire vehicle. This helps to optimize the vehicle's energy consumption management, reduce unnecessary energy consumption, and improve energy efficiency. As an important part of the vehicle's electrical system, accurate estimation of the battery's capacity is crucial to ensuring the stable operation of the vehicle's electrical system. By accurately calculating the battery capacity, it can be ensured that the electrical system can continuously and stably supply power during the vehicle's sleep and startup process, thereby enhancing the stability and safety of the vehicle.

[0010] In addition, the process of estimating battery capacity also includes consideration of the battery's reserved charge capacity, which helps avoid frequent charging and replacement due to insufficient battery capacity, thereby reducing vehicle maintenance costs and potential risks.

[0011] Preferably, the step of determining the starting current of the battery according to the starting characteristic curve of the starter based on the parameters of the starter motor and determining the battery type in combination with the estimated battery capacity comprises: Determine the parameters of the starter motor according to the engine matching; Based on the parameters of the starter motor, the starting current of the battery is determined according to the starting characteristic curve of the starter; Determine the battery type based on the battery's starting current and estimated battery capacity.

[0012] By determining the parameters of the starter motor according to the engine matching, the matching degree of the starter motor and the engine can be ensured, and then the starting current of the battery can be accurately determined based on the starting characteristic curve. This step ensures that the vehicle can obtain sufficient current support during the starting process, thereby ensuring the stability and reliability of the starting performance. Determining the battery type based on the battery starting current and the estimated battery capacity can ensure that the selected battery can not only meet the vehicle starting requirements, but also maintain high energy efficiency and life in daily use. This optimized selection helps to reduce the frequency of battery replacement and reduce maintenance costs.

[0013] Batteries play a vital role in the starting and running of vehicles. If the battery performance is poor or the selection is inappropriate, it may cause the vehicle to fail to start or the electrical system to malfunction, thus affecting driving safety. By determining the battery type and capacity based on the starter motor parameters, this risk can be greatly reduced and the safety of the vehicle can be enhanced. Optimizing the selection and use of batteries not only helps to improve vehicle performance, but also promotes energy conservation and emission reduction to a certain extent. The right battery can manage electrical energy more efficiently and reduce unnecessary energy consumption, thereby reducing the vehicle's carbon emissions and environmental pollution.

[0014] Preferably, according to the vehicle's operating conditions, seasons, and operating environment, the step of introducing the frequency coefficient of the use of electrical equipment to calculate the vehicle's electrical load, estimating the rated current of the selected generator, and determining the type of generator that matches the battery includes: The vehicle operating conditions are divided according to the engine speed; wherein, when the engine speed is less than a first threshold, it is determined as a low idle condition; when the engine speed is greater than a second threshold, it is determined as a high idle condition; and when the engine speed is greater than or equal to the first threshold and less than or equal to the second threshold, it is determined as a comprehensive condition; Divide each usage condition into spring, autumn, summer and winter according to the season; and set the usage frequency of each electrical equipment according to the divided season; According to the usage environment, spring and autumn are divided into day and night, summer is divided into day, night and rainy night, and winter is divided into day, night and snowy night.

[0015] By making a detailed division of the vehicle's operating conditions (low idle, high idle, comprehensive operating conditions), and considering seasonal changes (spring and autumn, summer, winter) and specific conditions of the operating environment (such as daytime, nighttime, rainy nights, snowy nights), the vehicle's power demand under different conditions can be more accurately reflected. This detailed division method helps to improve the accuracy of the vehicle's power load estimation, and provides more reliable data support for the subsequent estimation of the generator's rated current and the selection of the generator type. By considering the frequency of use of electrical equipment in different seasons and operating environments, the vehicle's power can be more reasonably allocated and managed to avoid unnecessary waste of power. This refined management helps to improve the vehicle's energy efficiency, reduce carbon emissions, and comply with the environmental protection concept of energy conservation and emission reduction. Comprehensive consideration of different operating conditions, seasons, and operating environments enables the selected generator to better adapt to various complex conditions, ensure that the vehicle can provide stable power supply in various extreme environments, and improve the vehicle's adaptability and reliability.

[0016] Preferably, according to the vehicle's operating conditions, seasons, and operating environment, the steps of introducing the frequency coefficient of the use of electrical equipment to calculate the vehicle's electrical load, estimating the rated current of the selected generator, and determining the type of generator that matches the battery include: Get the rated power of each electrical device in the vehicle; Calculate the power consumption of each electrical equipment under each operating condition, season and environment according to the frequency of use coefficient; Calculate the current of each electrical device based on the power consumption of each electrical device under various operating conditions, seasons, and usage environments; Select the rated current of the generator based on the current estimation of each electrical equipment and determine the type of generator that matches the battery; Generate a calculation table for the current of each electrical equipment under each operating condition, season, and operating environment, as well as the rated current of the generator.

[0017] By obtaining the rated power of each electrical device in the vehicle and calculating the power consumption under various operating conditions, seasons, and environments in combination with the frequency coefficient, the power demand of the vehicle under different conditions can be accurately evaluated. This helps to ensure that the rated current of the selected generator can meet the actual power demand of the vehicle and avoid insufficient or excessive power. The rated current of the generator is estimated based on the current of each electrical device, and the type of generator that matches the battery is determined accordingly to ensure a good match between the generator and the battery. This optimized selection not only improves power generation efficiency and energy utilization, but also reduces the operating noise and vibration of the generator, improving the comfort and reliability of the vehicle.

[0018] By calculating the current of each electrical device under different conditions and generating a calculation table, the vehicle's power consumption can be monitored and analyzed in real time. This helps to promptly discover and solve abnormal power consumption problems and improve the efficiency and intelligence of vehicle energy management. Considering the vehicle's power demand under different working conditions, seasons, and environments can ensure that the selected generator can adapt to various complex conditions and improve the vehicle's adaptability and durability. Especially in extreme weather or harsh environments, this refined power management can ensure the stable operation of the vehicle's electrical system.

[0019] Preferably, according to the vehicle's operating conditions, seasons, and operating environment, the frequency coefficient of the use of electrical equipment is introduced to calculate the vehicle's electrical load, the rated current of the selected generator is estimated, and the step of determining the type of generator that matches the battery includes: The selected generator is verified, and after passing the verification, the battery type and the matching generator type are output.

[0020] Preferably, the step of verifying the selected generator includes: Setting the vehicle engine to work in different operating conditions; Obtaining the engine speed, and calculating the generator speed based on the speed ratio of the engine to the generator; The generator current is obtained based on the generator speed and the generator performance curve, in A; The verification passes when it is determined that the generator current obtained under low idle conditions or comprehensive conditions meets the rated current of the generator; or when it is determined that the power provided by the battery meets the requirement of the differential power; wherein the differential power is the power required to provide the differential current between the rated current of the generator under high idle conditions and the obtained generator current.

[0021] By calibrating the selected generator, you can ensure that the performance of the selected generator under different operating conditions is consistent with the estimate, and then ensure that the matching relationship between the generator and the battery is accurate. This helps to avoid insufficient or excessive power supply caused by improper matching in actual use. During the calibration process, by simulating the working state of the vehicle engine under different operating conditions and calculating the actual current output of the generator, the stability of the generator in the actual operation of the vehicle can be evaluated. This helps to ensure that the electrical system can provide stable power supply under various operating conditions and improve the reliability and safety of the vehicle.

[0022] The verification process takes into account the current output of the generator under different operating conditions, and determines whether the battery needs to provide additional power to meet the needs of high idle conditions. This refined energy management helps optimize energy efficiency and reduce unnecessary energy consumption and emissions. Through the verification process, potential problems in generator selection can be discovered and corrected in a timely manner to avoid frequent failures and increased maintenance costs caused by improper selection. At the same time, it also helps to reduce safety risks caused by electrical system failures. The verification process takes into account the power demand of the vehicle in different seasons and usage environments, which helps to ensure that the selected generator can adapt to various complex conditions and improve the adaptability and durability of the vehicle.

[0023] In a second aspect, the technical solution of the present invention provides a vehicle power balance analysis and calculation device, including a static analysis and calculation module and a dynamic analysis and calculation module; Static analysis calculation module, used to estimate the battery capacity by performing static power balance calculation on the whole vehicle; Dynamic analysis and calculation module, used to determine the battery type and generator type by performing dynamic power balance calculation on the whole vehicle; The dynamic analysis and calculation module includes a battery parameter determination unit and a generator parameter determination unit; A battery parameter determination unit, configured to determine the starting current of the battery according to the starting characteristic curve of the starter based on the parameters of the starter motor, and determine the battery type in combination with the estimated battery capacity; The generator parameter determination unit is used to calculate the vehicle power load based on the vehicle's operating conditions, season, and operating environment, introduce the frequency coefficient of electrical equipment use, estimate the rated current of the selected generator, and determine the generator type that matches the battery.

[0024] Preferably, the static analysis calculation module is specifically used for the vehicle to enter a sleep state after being locked. Based on the condition that the cumulative sleep current of all controllers is less than the static current of the entire vehicle, the discharge amount that the battery needs to provide is determined, and the battery capacity is estimated in combination with the reserved charge amount of the battery.

[0025] Preferably, the battery parameter determination unit is specifically used to determine the parameters of the starter motor according to the engine matching; based on the parameters of the starter motor, determine the starting current of the battery according to the starting characteristic curve of the starter; determine the type of battery in combination with the starting current of the battery and the estimated battery capacity.

[0026] Preferably, the device also includes a preset module for dividing the vehicle operating conditions according to the engine speed; wherein, when the engine speed is less than the first threshold, it is determined as a low idle condition, when the engine speed is greater than the second threshold, it is determined as a high idle condition, and when the engine speed is greater than or equal to the first threshold and less than or equal to the second threshold, it is determined as a comprehensive condition; each operating condition is divided into spring and autumn, summer and winter according to the season; and the frequency of use of each electrical equipment is set according to the divided season; spring and autumn are divided into day and night according to the use environment, summer is divided into day, night and rainy night, and winter is divided into day, night and snowy night.

[0027] Preferably, the generator parameter determination unit is specifically used to obtain the rated power of each electrical device in the vehicle; calculate the electrical power of each electrical device under each operating condition, season, and operating environment based on the frequency of use coefficient; calculate the current of each electrical device based on the electrical power of each electrical device under each operating condition, season, and operating environment; select the rated current of the generator based on the current estimate of each electrical device, and determine the type of generator that matches the battery; generate a calculation table for the current of each electrical device under each operating condition, season, and operating environment and the rated current of the generator.

[0028] Preferably, the device further comprises a verification output module for verifying the selected generator, and outputting the battery type and the generator type that matches it after the verification.

[0029] Preferably, the verification output module includes a verification unit and an output unit; A verification unit is used to set the vehicle engine to work in different operating conditions; obtain the engine speed, and calculate the generator speed based on the speed ratio of the engine and the generator; obtain the generator current based on the generator speed combined with the performance curve of the generator; determine that the generator current obtained under low idle speed conditions or comprehensive conditions meets the rated current of the generator; or determine that the power provided by the battery meets the requirement of the difference power, the verification is passed; wherein the difference power is the power required to provide the difference current between the rated current of the generator under high idle speed conditions and the obtained generator current; The output unit is used to output the battery type and the matching generator type after verification.

[0030] In a third aspect, the technical solution of the present invention also provides an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; the memory stores computer program instructions executable by the at least one processor, and the computer program instructions are executed by the at least one processor so that the at least one processor can execute the vehicle power balance analysis and calculation method as described in the first aspect.

[0031] In a fourth aspect, the technical solution of the present invention further provides a vehicle, wherein the battery and the generator are selected by the method described in the first aspect.

[0032] It can be seen from the above technical solutions that the advantages of the present invention are: the battery capacity is estimated through static power balance calculation, and the types of batteries and generators are determined in combination with dynamic power balance calculation, so that the analysis results are more accurate and reliable, and can better meet the needs of vehicles under various working conditions. This method takes into account various factors such as the vehicle's operating conditions, seasons, and use environment, and calculates the vehicle's power load by introducing the frequency coefficient of power equipment use, thereby improving the adaptability and practicality of the analysis results.

[0033] Based on the dormant current of the vehicle, the rated power of the electrical appliances, and the various operating conditions of the vehicle, the vehicle's power balance is analyzed and calculated to select the best battery and generator to achieve the best match between the battery and the generator. The calculation is simple, the feasibility is strong, and the analysis and calculation data is closer to the actual vehicle state. It provides the best vehicle state for the subsequent design stage of the vehicle's electric balance bench test and actual vehicle road test verification, reducing the risk and cost of repeated matching selection of batteries and generators. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0035] Figure 1 A schematic flow chart of a method provided in an embodiment of the present invention.

[0036] Figure 2 It is the starting characteristic curve of the starter.

[0037] Figure 3 This is the performance curve of the generator. DETAILED DESCRIPTION

[0038] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0039] like Figure 1As shown, an embodiment of the present invention provides a vehicle power balance analysis and calculation method, comprising the following steps: Step 1: Estimate the battery capacity by performing static power balance calculation on the vehicle; In this step, after the vehicle is locked, it enters a dormant state. Based on the condition that the sum of the dormant currents of all controllers is less than the static current of the entire vehicle, the discharge amount that the battery needs to provide is determined. Combined with the reserved charge amount of the battery, the capacity of the battery is estimated. Specifically, after the vehicle is locked, it enters a dormant state. The static current of the entire vehicle is <20mA, and it can be left for about 50 days to meet the requirement that the vehicle can be started next time. In this case, the sum of the dormant currents of all controllers must be controlled to be <20mA. Calculated based on 19mA and 50 days: the discharge amount that the battery needs to provide Q=I*T=0.019A*24h*50days=22.8Ah. The battery capacity is guaranteed to be 75% as a principle calculation, 22.8 / 25%=91.2Ah. It is estimated that the battery can be selected to be 90Ah, which can meet the requirements.

[0040] Step 2: Determine the battery type and generator type by performing dynamic power balance calculation on the vehicle; including: Step 21: Determine the starting current of the battery based on the parameters of the starter motor according to the starting characteristic curve of the starter, and determine the battery type in combination with the estimated battery capacity; Step 22: According to the vehicle's operating conditions, season, and operating environment, the frequency coefficient of electrical equipment use is introduced to calculate the vehicle's electrical load, estimate the rated current of the generator, and determine the generator type that matches the battery.

[0041] In some embodiments, the step of determining the starting current of the battery according to the starting characteristic curve of the starter based on the parameters of the starter motor and determining the battery type in combination with the estimated battery capacity includes: Step 211: Determine the parameters of the starter motor according to the engine matching; Step 212: Based on the parameters of the starter motor, determine the starting current of the battery according to the starting characteristic curve of the starter; Step 213: Determine the type of battery based on the starting current of the battery and the estimated battery capacity.

[0042] The main function of the battery is to supply power to the starter; when the generator is overloaded, it assists the generator in supplying power to electrical appliances; when the generator is working normally, the battery is equivalent to a large capacitor that stabilizes the power supply voltage and converts the remaining electrical energy of the generator into chemical energy for storage.

[0043] The starting motor is matched with the engine. After the parameters of the starting motor are determined, the starting characteristic curve (such as Figure 2As shown in the figure, the starting current of the battery is determined to be 600A. Taking into account the low-temperature cold start performance, the static current of the vehicle, etc., the battery capacity of 90Ah is selected to meet the requirements.

[0044] It should be noted that the steps of calculating the vehicle power load by introducing the frequency coefficient of the power equipment according to the vehicle's operating conditions, seasons, and operating environment, estimating the rated current of the selected generator, and determining the type of generator that matches the battery include: The vehicle operating conditions are divided according to the engine speed; wherein, when the engine speed is less than a first threshold, it is determined as a low idle condition; when the engine speed is greater than a second threshold, it is determined as a high idle condition; and when the engine speed is greater than or equal to the first threshold and less than or equal to the second threshold, it is determined as a comprehensive condition; Divide each usage condition into spring, autumn, summer and winter according to the season; and set the usage frequency of each electrical equipment according to the divided season; According to the usage environment, spring and autumn are divided into day and night, summer is divided into day, night and rainy night, and winter is divided into day, night and snowy night.

[0045] In some embodiments, according to the vehicle's operating conditions, seasons, and operating environment, the steps of introducing the frequency coefficient of the use of electrical equipment to calculate the vehicle's electrical load, estimating the rated current of the selected generator, and determining the type of generator that matches the battery include: Step 221: Obtain the rated power of each electrical device of the vehicle; Step 222: Calculate the power consumption of each electrical device under each use condition, season, and use environment according to the use frequency coefficient; Step 223: Calculate the current of each electrical device based on the power consumption of each electrical device under each operating condition, season, and operating environment; Step 224: Select the rated current of the generator based on the current estimation of each electrical device, and determine the type of generator that matches the battery; Step 225: Generate a calculation table for the current of each electrical equipment under each operating condition, season, and operating environment, as well as the rated current of the generator.

[0046] The generator is the energy source for the vehicle's electrical equipment and is also responsible for supplementing the battery. If the generator power is too large, it will not only take up space, but also be difficult to install, and the generator capacity will not be fully utilized, and the engine's fuel consumption will also increase. If the generator power is too small, the battery will be undercharged, affecting the start and causing premature battery damage. Considering the need to ensure power supply to electrical equipment, improve the economy of the power system and the power of the engine, the selection of the generator output power should be based on ensuring the normal power consumption of the vehicle and the amount of charge required by the battery. Under extreme conditions, the battery is allowed to provide a certain amount of discharge current to the electrical equipment. This is the key to selecting the generator output power.

[0047] a. Calculation of vehicle power load: According to the working time of electrical equipment during driving, electrical equipment can be divided into three categories: Continuously working electrical equipment Electrical equipment that keeps working while the car is driving, including iBCM, engine ECU, TCU, domain controller, radiator fan, etc.; Long-time working electrical equipment Electrical equipment that is frequently used during vehicle driving, including air conditioning system, high and low beam lights, GCU, HCU, daytime running lights, etc.; Random working electrical equipment Electrical equipment that is used temporarily or randomly while the vehicle is in motion, including ESP, EPS, interior lights, electric windows, etc.; According to the operating conditions, seasons and environmental conditions of the vehicle, the frequency coefficient of electrical equipment is introduced to calculate the power consumption of the whole vehicle. The frequency coefficients μo, μs and μw represent the frequency coefficients of electrical equipment use in summer and winter conditions, respectively. The current data under various operating conditions are calculated. According to the current data under various operating conditions, a 150A generator is estimated and the transmission ratio between the engine and the generator is 1:2.444.

[0048] In some embodiments, according to the vehicle's operating conditions, seasons, and operating environment, the frequency coefficient of the use of electrical equipment is introduced to calculate the vehicle's electrical load, the rated current of the selected generator is estimated, and the step of determining the type of generator that matches the battery includes: The selected generator is verified, and after passing the verification, the battery type and the matching generator type are output.

[0049] Specifically, the steps for verifying the selected generator include: The vehicle engine is set to work in different operating conditions respectively; the engine speed is obtained, and the generator speed is calculated based on the speed ratio of the engine and the generator; the generator current, in unit A, is obtained based on the generator speed combined with the performance curve of the generator; it is determined that the generator current obtained under low idle conditions or comprehensive conditions meets the rated current of the generator; or when it is determined that the power provided by the battery meets the requirement of the differential power, the verification passes; wherein the differential power is the power required to provide the differential current between the rated current of the generator under high idle conditions and the obtained generator current.

[0050] Under low idle conditions: The engine is at low idle speed of 750 rpm, 750 rpm x2.444 = 1833 rpm. From the performance curve of the generator (such as Figure 3 As shown in the figure, the current output by the generator at this time is 80Ah, which meets the requirement; the engine is at a high idle speed of 900rpm, 900 rpm x2.444=2200 rpm. From the performance curve of the generator, the current output by the generator at this time is 97Ah, which does not meet the high-load working conditions in summer. At this time, the generator and the battery are needed to provide power together, 104.78 Ah-97 Ah =7.78 Ah, 90 Ah x25%=22.5 Ah, 22.5 Ah / 7.78 Ah =2.89h, which meets the requirement that the battery can supplement the generator to provide at least 2h of power under extreme working conditions; the engine is under comprehensive working conditions, running at medium and high speed, with a speed ≧1800, 1800 rpm x2.444=4400rpm. From the performance curve of the generator, the current output by the generator at this time is ≧140A, which meets the power supply of electrical equipment and can charge the battery.

[0051] The embodiment of the present invention provides a vehicle power balance analysis and calculation device, including a static analysis and calculation module and a dynamic analysis and calculation module; Static analysis calculation module, used to estimate the battery capacity by performing static power balance calculation on the whole vehicle; Dynamic analysis and calculation module, used to determine the battery type and generator type by performing dynamic power balance calculation on the whole vehicle; The dynamic analysis and calculation module includes a battery parameter determination unit and a generator parameter determination unit; A battery parameter determination unit, configured to determine the starting current of the battery according to the starting characteristic curve of the starter based on the parameters of the starter motor, and determine the battery type in combination with the estimated battery capacity; The generator parameter determination unit is used to calculate the vehicle power load based on the vehicle's operating conditions, season, and operating environment, introduce the frequency coefficient of electrical equipment use, estimate the rated current of the selected generator, and determine the generator type that matches the battery.

[0052] In some embodiments, the static analysis calculation module is specifically used to determine the discharge amount that the battery needs to provide based on the condition that the cumulative sum of the sleep currents of all controllers is less than the static current of the entire vehicle after the vehicle is locked, and estimate the capacity of the battery in combination with the reserved charge capacity of the battery.

[0053] In some embodiments, the battery parameter determination unit is specifically used to determine the parameters of the starter motor according to the engine matching; based on the parameters of the starter motor, determine the starting current of the battery according to the starting characteristic curve of the starter; determine the type of battery in combination with the starting current of the battery and the estimated battery capacity.

[0054] In some embodiments, the device also includes a preset module for dividing the vehicle usage conditions according to the engine speed; wherein, when the engine speed is less than a first threshold, it is determined as a low idle condition, when the engine speed is greater than a second threshold, it is determined as a high idle condition, and when the engine speed is greater than or equal to the first threshold and less than or equal to the second threshold, it is determined as a comprehensive condition; each usage condition is divided into spring and autumn, summer and winter according to the season; and the usage frequency of each electrical equipment is set according to the divided season; spring and autumn are divided into day and night according to the usage environment, summer is divided into day, night and rainy night, and winter is divided into day, night and snowy night.

[0055] In some embodiments, the generator parameter determination unit is specifically used to obtain the rated power of each electrical device in the vehicle; calculate the electrical power of each electrical device under each operating condition, season, and operating environment based on the frequency of use coefficient; calculate the current of each electrical device based on the electrical power of each electrical device under each operating condition, season, and operating environment; select the rated current of the generator based on the current estimate of each electrical device, and determine the type of generator that matches the battery; generate a calculation table for the current of each electrical device under each operating condition, season, and operating environment and the rated current of the generator.

[0056] In some embodiments, the device further includes a verification output module for verifying the selected generator, and outputting the battery type and the generator type that matches it after the verification.

[0057] The verification output module includes a verification unit and an output unit; A verification unit is used to set the vehicle engine to work in different operating conditions; obtain the engine speed, and calculate the generator speed based on the speed ratio of the engine and the generator; obtain the generator current based on the generator speed combined with the performance curve of the generator; determine that the generator current obtained under low idle speed conditions or comprehensive conditions meets the rated current of the generator; or determine that the power provided by the battery meets the requirement of the difference power, the verification is passed; wherein the difference power is the power required to provide the difference current between the rated current of the generator under high idle speed conditions and the obtained generator current; The output unit is used to output the battery type and the matching generator type after verification.

[0058] The embodiment of the present invention also provides an electronic device, which includes: a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus. The communication bus can be used for information transmission between the electronic device and the sensor. The processor can call the logic instructions in the memory to execute the following method: estimate the battery capacity by performing a static power balance calculation on the whole vehicle; determine the battery type and the generator type by performing a dynamic power balance calculation on the whole vehicle; including: determining the starting current of the battery according to the starting characteristic curve of the starter based on the parameters of the starter motor, and determining the battery type in combination with the estimated battery capacity; according to the vehicle's operating conditions, seasons, and use environment, introduce the frequency coefficient of the use of electrical equipment to calculate the vehicle's power load, estimate the rated current of the selected generator, and determine the type of generator that matches the battery.

[0059] In addition, the logic instructions in the above-mentioned memory can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program code.

[0060] An embodiment of the present invention further provides a vehicle, wherein the battery and the generator are selected by the method described in the above embodiment.

[0061] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vehicle power balance analysis and calculation method, characterized in that: The steps include: Estimate the battery capacity by performing static power balance calculation on the whole vehicle; Determine the battery type and generator type by performing dynamic power balance calculation on the whole vehicle; include: Determine the starting current of the battery based on the parameters of the starter motor according to the starting characteristic curve of the starter, and determine the battery type in combination with the estimated battery capacity; According to the vehicle's operating conditions, seasons, and usage environment, the frequency coefficient of electrical equipment use is introduced to calculate the vehicle's electrical load, estimate the rated current of the generator, and determine the type of generator that matches the battery.

2. The vehicle power balance analysis and calculation method according to claim 1 is characterized in that: By analyzing and calculating the static power balance of the whole vehicle, the steps to estimate the battery capacity include: After locking the vehicle, it enters a dormant state. Based on the condition that the cumulative dormant current of all controllers is less than the static current of the entire vehicle, the discharge amount that the battery needs to provide is determined, and the battery capacity is estimated in combination with the reserved charge capacity of the battery.

3. The vehicle power balance analysis and calculation method according to claim 2 is characterized in that: The steps of determining the starting current of the battery based on the parameters of the starter motor according to the starting characteristic curve of the starter and determining the battery type in combination with the estimated battery capacity include: Determine the parameters of the starter motor according to the engine matching; Based on the parameters of the starter motor, the starting current of the battery is determined according to the starting characteristic curve of the starter; Determine the battery type based on the battery's starting current and estimated battery capacity.

4. The vehicle power balance analysis and calculation method according to claim 3 is characterized in that: According to the vehicle's operating conditions, seasons, and operating environment, the steps of introducing the frequency coefficient of electrical equipment to calculate the vehicle's electrical load, estimating the rated current of the selected generator, and determining the type of generator that matches the battery include: According to the working time of the electrical equipment during driving, the electrical equipment is grouped into groups, including a continuous working electrical equipment group, a long-time working electrical equipment group, and a random working electrical equipment group; The vehicle operating conditions are divided according to the engine speed and the grouping of electrical equipment; among them, the continuous working electrical equipment group and the long-time working electrical equipment group are judged as low idle conditions when there are electrical equipment working and the engine speed is less than a first threshold, the continuous working electrical equipment group and the long-time working electrical equipment group are judged as high idle conditions when there are electrical equipment working and the engine speed is greater than a second threshold, and all groups are judged as comprehensive conditions when there are electrical equipment working; Divide each usage condition into spring, autumn, summer and winter according to the season; and set the usage frequency of each electrical equipment according to the divided season; According to the usage environment, spring and autumn are divided into day and night, summer is divided into day, night and rainy night, and winter is divided into day, night and snowy night.

5. The vehicle power balance analysis and calculation method according to claim 4 is characterized in that: According to the vehicle's operating conditions, seasons, and operating environment, the steps of introducing the frequency coefficient of electrical equipment use to calculate the vehicle's electrical load, estimating the rated current of the selected generator, and determining the type of generator that matches the battery include: Get the rated power of each electrical device in the vehicle; Calculate the power consumption of each electrical equipment under each operating condition, season and environment according to the frequency of use coefficient; Calculate the current of each electrical device based on the power consumption of each electrical device under various operating conditions, seasons, and usage environments; Select the rated current of the generator based on the current estimation of each electrical equipment and determine the type of generator that matches the battery; Generate a calculation table for the current of each electrical equipment under each operating condition, season, and operating environment, as well as the rated current of the generator.

6. The vehicle power balance analysis and calculation method according to claim 5 is characterized in that: According to the vehicle's operating conditions, seasons, and operating environment, the steps of introducing the frequency coefficient of electrical equipment use to calculate the vehicle's electrical load, estimating the rated current of the selected generator, and determining the type of generator that matches the battery include: The selected generator is verified, and after passing the verification, the battery type and the matching generator type are output.

7. The vehicle power balance analysis and calculation method according to claim 6 is characterized in that: The steps to verify the selected generator include: Setting the vehicle engine to work in different operating conditions; Obtaining the engine speed, and calculating the generator speed based on the speed ratio of the engine to the generator; The generator current is obtained based on the generator speed and the generator performance curve, in A; The verification passes when it is determined that the generator current obtained under low idle conditions or comprehensive conditions meets the rated current of the generator; or when it is determined that the power provided by the battery meets the requirement of the differential power; wherein the differential power is the power required to provide the differential current between the rated current of the generator under high idle conditions and the obtained generator current.

8. A vehicle power balance analysis and calculation device, characterized in that: It includes a static analysis and calculation module and a dynamic analysis and calculation module; Static analysis calculation module, used to estimate the battery capacity by performing static power balance calculation on the whole vehicle; Dynamic analysis and calculation module, used to determine the battery type and generator type by performing dynamic power balance calculation on the whole vehicle; The dynamic analysis and calculation module includes a battery parameter determination unit and a generator parameter determination unit; A battery parameter determination unit, configured to determine the starting current of the battery according to the starting characteristic curve of the starter based on the parameters of the starter motor, and determine the battery type in combination with the estimated battery capacity; The generator parameter determination unit is used to calculate the vehicle power load based on the vehicle's operating conditions, season, and operating environment, introduce the frequency coefficient of electrical equipment use, estimate the rated current of the selected generator, and determine the generator type that matches the battery.

9. An electronic device, characterized in that: The electronic device includes: at least one processor; and a memory communicatively connected to the at least one processor; the memory stores computer program instructions that can be executed by the at least one processor, and the computer program instructions are executed by the at least one processor so that the at least one processor can execute the vehicle power balance analysis and calculation method as described in any one of claims 1 to 7.

10. A vehicle, characterized in that: The vehicle selects the battery and the generator by the method according to any one of claims 1 to 7.

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