A vehicle power intelligent management method and system

Abstract

The present application discloses a method and system for intelligent power management of a vehicle, and relates to the technical field of vehicle power management. The method includes the following steps: presetting the corresponding battery charging characteristic table and vehicle load power characteristic table based on the charging demand of the battery and the power demand of each vehicle load; querying and determining the current demand in the battery charging characteristic table and the vehicle load power characteristic table according to the acquired current state of the battery and the current state of each vehicle load; calculating the target voltage according to the acquired current power state of the vehicle and the current load of the charging unit, and controlling the charging unit with the target voltage. The present application optimizes the control strategy for charging the charging unit, ensures the balance between the supply and demand of the vehicle load power and the battery charging, improves the power economy of the power supply vehicle and extends the service life of the battery, and ensures the power supply quality.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle power management, and in particular to a vehicle power intelligent management method and system. Background Art

[0002] With the development of vehicle intelligence, the convenience of vehicle operation is improving, while the demand for power economy is constantly increasing. At the same time, higher requirements are also put forward for the power supply quality of the whole vehicle. We know that the key to achieving fuel saving or reducing high-voltage battery consumption is the battery capacity management of the vehicle's low-voltage battery.

[0003] However, there are still challenges in the implementation of vehicle low-voltage power management systems, such as the contradiction between energy-saving charging in a wide range of voltage settings and the power supply quality in a narrow range of voltage settings, and how to ensure the service life of batteries under frequent charge and discharge cycles. This requires us to analyze from the perspective of power management.

[0004] In the related art, a vehicle power management system is disclosed. First, by monitoring the state of the battery, the applicable state of the electrical appliances of the vehicle is controlled, and the power generation power and output voltage of the generator are controlled at the same time, and the battery state information is provided to the driver, so as to optimize the electrical balance of the vehicle to the greatest extent; secondly, the static current of the vehicle is controlled to reduce the loss of the static current to the battery power, and ensure the time for the vehicle to start normally after parking. In addition, the charging and discharging state of the battery is optimized to extend the service life of the battery. However, the related art still adopts the method of turning off the load during the vehicle driving stage, which does not really meet the needs of users. Summary of the invention

[0005] The embodiments of the present application provide a method and system for intelligent power management of a vehicle to solve the technical problem of imperfect power management in a car in the related art.

[0006] In a first aspect, a method for intelligent power management of a vehicle is provided, comprising the following steps:

[0007] Presetting a corresponding battery charging characteristic table and a vehicle load power consumption characteristic table based on the battery charging demand and the power consumption demand of each vehicle load;

[0008] According to the acquired current state of the battery and the current state of each vehicle load, query and determine the current demand in the battery charging characteristic table and the vehicle load power consumption characteristic table;

[0009] According to the acquired current power state of the vehicle and the current load of the charging unit, the target voltage is calculated under the constraint of the current demand, and the charging unit is controlled with the target voltage.

[0010] In some embodiments, the step of presetting the battery charging characteristic table based on the charging demand of the battery specifically includes:

[0011] A battery charging characteristic table is pre-set based on the charging demand of the battery, and the battery charging characteristic table includes a charging voltage lower limit set according to the difference between the current capacity of the battery and the target capacity and a charging voltage upper limit set according to the battery temperature.

[0012] In some embodiments, the step of searching and determining the current demand in the battery charging characteristic table according to the acquired current state of the battery specifically includes:

[0013] According to the acquired current capacity and current temperature of the battery, the lower limit requirement and the upper limit requirement of the charging voltage of the battery are queried and determined in the battery charging characteristic table, that is, the charging voltage requirement of the battery is obtained.

[0014] In some embodiments, the step of presetting the vehicle load power consumption characteristic table based on the power consumption demand of each vehicle load specifically includes:

[0015] A vehicle load power consumption characteristic table is pre-set based on the power consumption demand of each vehicle load, and the vehicle load power consumption characteristic table includes the safety voltage, voltage fluctuation range, voltage regulation rate, nominal power of each vehicle load, and a priority determined according to the functional safety level of each vehicle load.

[0016] In some embodiments, the step of searching and determining the current demand in the vehicle load power consumption characteristic table according to the acquired current state of each vehicle load specifically includes:

[0017] According to the current working state of each vehicle load obtained, query the safe voltage, voltage fluctuation range, voltage regulation rate, nominal power and priority of each vehicle load in the current working state in the vehicle load power consumption characteristic table;

[0018] Based on the queried priorities, the current safety voltage requirement, voltage fluctuation range requirement, voltage regulation rate requirement, and power requirement of the vehicle load are determined.

[0019] In some embodiments, the step of determining the current safety voltage requirement, voltage fluctuation range requirement, voltage regulation rate requirement, and power requirement of the vehicle load based on the queried priorities specifically includes:

[0020] Based on the priorities of the queried safety voltages, the intersection of the queried safety voltages is solved, and the intersection is used as the safety voltage requirement of the vehicle load. If the intersection is empty, the minimum upper limit of the queried safety voltages is used as the upper limit requirement of the safety voltage, and the lower limit of the safety voltage of the vehicle load with a higher priority is used as the lower limit requirement of the safety voltage;

[0021] The minimum voltage fluctuation range among the queried voltage fluctuation ranges is used as the voltage fluctuation range requirement of the vehicle load;

[0022] The minimum voltage regulation rate among the queried voltage regulation rates is used as the voltage regulation rate requirement of the vehicle load;

[0023] The power demand is obtained by weighted calculation based on the queried nominal powers.

[0024] In some embodiments, the step of querying and determining the current demand in the battery charging characteristic table and the vehicle load power consumption characteristic table according to the acquired current state of the battery and the current state of each vehicle load specifically includes:

[0025] Based on the voltage fluctuation range requirement of the vehicle load, the intersection of the safety voltage requirement of the vehicle load and the charging voltage requirement of the battery is solved, and the intersection is used as the grid voltage requirement. If the intersection is empty, the safety voltage lower limit requirement of the vehicle load is used as the grid voltage lower limit requirement, and the battery charging voltage upper limit requirement is used as the grid voltage upper limit requirement.

[0026] In some embodiments, the step of calculating the target voltage based on the acquired current power state of the vehicle and the current load of the charging unit and under the constraint of the current demand, and controlling the charging unit with the target voltage specifically includes:

[0027] According to the acquired current power state of the vehicle, determine whether the vehicle is currently in a power mode, an economic mode or a normal mode and calculate the corresponding expected voltage according to the grid voltage demand;

[0028] A target voltage is calculated according to the expected voltage and the voltage regulation rate requirement, and the charging unit is controlled to supply power with the target voltage.

[0029] In some embodiments, the step of determining whether the vehicle is currently in a power mode, an economy mode, or a normal mode and calculating the corresponding expected voltage specifically includes:

[0030] If in dynamic mode, reduce the load of the charging unit and use the lower limit of the grid voltage as the expected voltage;

[0031] If in economic mode, increase or decrease the charging unit load according to the current scenario requirements. If the charging unit load is increased, the upper limit of the grid voltage requirement is used as the expected voltage. If the charging unit load is reduced, the lower limit of the grid voltage requirement is used as the expected voltage.

[0032] If in normal mode, the expected voltage is calculated based on the power demand of the vehicle load.

[0033] In a second aspect, a vehicle power intelligent management system is also provided, including a battery, a plurality of vehicle loads, a charging unit, a storage unit, a power management functional unit and a power management functional unit;

[0034] The storage unit is configured to store a battery charging characteristic table set based on the charging demand of the battery and a vehicle load power consumption characteristic table set based on the power consumption demand of each of the vehicle loads;

[0035] The power management functional unit is configured to query and determine the current demand in the battery charging characteristic table and the vehicle load power consumption characteristic table according to the acquired current state of the battery and the current state of each vehicle load;

[0036] The power management functional unit is configured to calculate a target voltage based on the acquired current power state of the vehicle and the current load of the charging unit and under the constraint of current demand, and control the charging unit with the target voltage.

[0037] The beneficial effects brought about by the technical solution provided in this application include: optimizing the control strategy for charging the charging unit, ensuring the supply and demand balance of the vehicle's load power consumption and battery charging, improving the power economy of the power supply vehicle and extending the service life of the battery, and ensuring the power supply quality.

[0038] The embodiment of the present application provides a method for intelligent power management of a vehicle. First, a battery charging characteristic table and a vehicle load power characteristic table are set according to the charging demand of the battery and the power demand of the vehicle load. After the current state of the battery and the current state of each vehicle load are obtained, the current demand is determined in combination with the constraints of the battery charging characteristic table and the vehicle load power characteristic table. The demand is a constraint condition that takes into account both battery charging and vehicle load power consumption. Under this constraint condition, the target voltage for controlling the charging of the charging unit calculated based on the obtained current power state of the vehicle and the current load of the charging unit can ensure the functional safety requirements of the electrical equipment vehicle load, and can also ensure the charging maintenance requirements of the battery, thereby ensuring the supply and demand balance of the vehicle load power consumption and battery charging, improving the power economy of the power supply vehicle and extending the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A flowchart of a method for intelligent power management of a vehicle provided in an embodiment of the present application;

[0041] Figure 2 A structural block diagram of a vehicle power intelligent management system provided in an embodiment of the present application.

[0042] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0044] The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may also be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions.

[0045] The embodiment of the present application provides a vehicle power intelligent management method, which, with the help of a battery charging characteristic table and a vehicle load power consumption characteristic table, fully considers the battery charging demand and the vehicle load power consumption demand, optimizes the charging control strategy of the charging unit, ensures the supply and demand balance of the vehicle load power consumption and battery charging, improves the power economy of the power supply vehicle and extends the service life of the battery, and ensures the power supply quality.

[0046] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0047] Please refer to Figure 1 The present application provides a method for intelligent power management of a vehicle, comprising the following steps:

[0048] S1: presetting a corresponding battery charging characteristic table and a vehicle load power consumption characteristic table based on the battery charging demand and the power consumption demand of each vehicle load;

[0049] S2: according to the acquired current state of the battery and the current state of each vehicle load, query and determine the current demand in the battery charging characteristic table and the vehicle load power consumption characteristic table;

[0050] S3: According to the acquired current power state of the vehicle and the current load of the charging unit, a target voltage is calculated under the constraint of current demand, and the charging unit is controlled with the target voltage.

[0051] In an embodiment of the present application, a battery charging characteristic table and a vehicle load power characteristic table are first set up correspondingly according to the charging demand of the battery and the power demand of the vehicle load. After the current state of the battery and the current state of each vehicle load are obtained, the current demand is determined in combination with the constraints of the battery charging characteristic table and the vehicle load power characteristic table. The demand is a constraint condition that takes into account both battery charging and vehicle load power consumption. Under this constraint condition, the target voltage used to control the charging of the charging unit calculated based on the obtained current power state of the vehicle and the current load of the charging unit can ensure the functional safety requirements of the electrical equipment vehicle load, and can also ensure the charging maintenance requirements of the battery, thereby ensuring the supply and demand balance of the vehicle load power consumption and battery charging, improving the power economy of the power supply vehicle and extending the service life of the battery.

[0052] In step S1, the step of presetting the battery charging characteristic table based on the battery charging demand specifically includes:

[0053] A battery charging characteristic table is pre-set based on the charging demand of the battery, and the battery charging characteristic table includes a charging voltage lower limit set according to the difference between the current capacity of the battery and the target capacity and a charging voltage upper limit set according to the battery temperature.

[0054] Further, in step S2, according to the acquired current state of the battery, the step of searching and determining the current demand in the battery charging characteristic table specifically includes:

[0055] According to the acquired current capacity and current temperature of the battery, the lower limit requirement and the upper limit requirement of the charging voltage of the battery are queried and determined in the battery charging characteristic table, that is, the charging voltage requirement of the battery is obtained.

[0056] As shown in Table 1, it is a battery charging characteristic table. The lower limit of the battery charging voltage is limited based on the battery capacity, and the upper limit of the charging voltage is limited based on the battery temperature, and "low temperature high voltage, high temperature low voltage" is used as the battery charging principle. After quantification, each capacity difference between the battery capacity and the target capacity corresponds to a lower limit of the charging voltage, and each temperature corresponds to an upper limit of the charging voltage.

[0057]

[0058] As can be seen from Table 1, the charging voltage requirement of the battery can be determined according to the current actual capacity and temperature of the battery. However, in the actual use of the battery, it is also necessary to consider the health status of the battery when determining the charging voltage requirement of the battery, and compensate the charging voltage of the battery based on the health factor corresponding to the current health status of the battery, that is, to compensate the capacity correction and temperature correction synchronously.

[0059] In this embodiment, based on the charging requirements of the battery, that is, the functional requirements and maintenance requirements of the battery, the charging voltage of the battery is finally determined by capacity correction, stability correction, and health correction of the charging voltage to ensure the charging and maintenance requirements of the battery, improve the durability of the battery, and thus reduce the user's maintenance costs. Of course, we know that the target capacity is not static. The target capacity of the battery changes dynamically based on the maintenance requirements of the battery. For example, when the battery is in a good maintenance state, the target capacity is lowered to meet the energy-saving requirements during dynamic charging and discharging. When the maintenance state is poor, the target capacity is increased to maintain the battery.

[0060] In step S1, the step of presetting the vehicle load power consumption characteristic table based on the power consumption demand of each vehicle load specifically includes:

[0061] A vehicle load power consumption characteristic table is pre-set based on the power consumption demand of each vehicle load, and the vehicle load power consumption characteristic table includes the safety voltage, voltage fluctuation range, voltage regulation rate, nominal power of each vehicle load, and a priority determined according to the functional safety level of each vehicle load.

[0062] In step S2, according to the acquired current state of each vehicle load, the step of searching and determining the current demand in the vehicle load power consumption characteristic table specifically includes:

[0063] According to the current working state of each vehicle load obtained, query the safe voltage, voltage fluctuation range, voltage regulation rate, nominal power and priority of each vehicle load in the current working state in the vehicle load power consumption characteristic table;

[0064] Based on the queried priorities, the current safety voltage requirement, voltage fluctuation range requirement, voltage regulation rate requirement, and power requirement of the vehicle load are determined.

[0065] Furthermore, the step of determining the current safety voltage requirement, voltage fluctuation range requirement, voltage regulation rate requirement, and power requirement of the vehicle load based on the queried priorities specifically includes:

[0066] Based on the priorities of the queried safety voltages, the intersection of the queried safety voltages is solved, and the intersection is used as the safety voltage requirement of the vehicle load. If the intersection is empty, the minimum upper limit of the queried safety voltages is used as the upper limit requirement of the safety voltage, and the lower limit of the safety voltage of the vehicle load with a higher priority is used as the lower limit requirement of the safety voltage;

[0067] The minimum voltage fluctuation range among the queried voltage fluctuation ranges is used as the voltage fluctuation range requirement of the vehicle load;

[0068] The minimum voltage regulation rate among the queried voltage regulation rates is used as the voltage regulation rate requirement of the vehicle load;

[0069] The power demand is obtained by weighted calculation based on the queried nominal powers.

[0070] Furthermore, the step of searching and determining the current demand in the battery charging characteristic table and the vehicle load power consumption characteristic table according to the acquired current state of the battery and the current state of each vehicle load specifically includes:

[0071] Based on the voltage fluctuation range requirement of the vehicle load, the intersection of the safety voltage requirement of the vehicle load and the charging voltage requirement of the battery is solved, and the intersection is used as the grid voltage requirement. If the intersection is empty, the safety voltage lower limit requirement of the vehicle load is used as the grid voltage lower limit requirement, and the battery charging voltage upper limit requirement is used as the grid voltage upper limit requirement.

[0072] As shown in Table 2, it is a table of vehicle load power consumption characteristics.

[0073]

[0074] In this embodiment, the priority of each vehicle load is determined based on the functional safety level of each vehicle load. The higher the safety level of the electrical equipment vehicle load, the higher the corresponding priority. The upper and lower safety voltage limits constitute the safety voltage of the vehicle load, and the voltage fluctuation range and the voltage regulation rate represent the maximum values ​​required to ensure the performance indicators of the electrical equipment vehicle load, so as to eliminate the impact of vehicle load performance degradation caused by voltage fluctuations.

[0075] Among them, each parameter in the vehicle load power consumption characteristic table is queried for a vehicle load in a working state, and then the intersection or the minimum value of a parameter in multiple vehicle loads is calculated.

[0076] The vehicle load power consumption characteristic table limits the power consumption demand of the vehicle load to ensure the functional safety of the electric vehicle load, eliminate functional defects caused by power quality issues, improve vehicle functional quality, and improve user satisfaction.

[0077] Specifically, the vehicle load mainly includes the vehicle's low-voltage electrical loads, such as various controllers, actuators or sensors, and the battery specifically refers to the vehicle's low-voltage battery, with a voltage of 12V or 24V, or 48V.

[0078] Furthermore, the step S3 specifically includes:

[0079] According to the acquired current power state of the vehicle, determine whether the vehicle is currently in a power mode, an economic mode or a normal mode and calculate the corresponding expected voltage according to the grid voltage demand;

[0080] A target voltage is calculated according to the expected voltage and the voltage regulation rate requirement, and the charging unit is controlled to supply power with the target voltage.

[0081] Furthermore, the step of determining whether the vehicle is currently in a power mode, an economy mode or a normal mode and calculating the corresponding expected voltage specifically includes:

[0082] If in dynamic mode, reduce the load of the charging unit and use the lower limit of the grid voltage as the expected voltage;

[0083] If in economic mode, increase or decrease the charging unit load according to the current scenario requirements. If the charging unit load is increased, the upper limit of the grid voltage requirement is used as the expected voltage. If the charging unit load is reduced, the lower limit of the grid voltage requirement is used as the expected voltage.

[0084] If in normal mode, the expected voltage is calculated based on the power demand of the vehicle load.

[0085] In the embodiment of the present application, the charging control of the charging unit not only takes into account the battery charging and the vehicle load power consumption, but also takes into account the current power state of the vehicle. Different control strategies are adopted according to different power states to control the increase and decrease of the charging unit load and determine the expected voltage. At the same time, the target voltage is calculated based on the voltage regulation rate requirement obtained from the vehicle load power consumption characteristic table. The value of the target voltage fully considers the factors related to the battery and the vehicle load, and can better enable the charging unit to charge. While optimizing power management, it also realizes intelligent power management.

[0086] like Figure 2 As shown, the embodiment of the present application also provides a vehicle power intelligent management system, including a battery, a plurality of vehicle loads, a charging unit, a storage unit, a power management functional unit and a power management functional unit;

[0087] The storage unit is configured to store a battery charging characteristic table set based on the charging demand of the battery and a vehicle load power consumption characteristic table set based on the power consumption demand of each of the vehicle loads;

[0088] The power management functional unit is configured to query and determine the current demand in the battery charging characteristic table and the vehicle load power consumption characteristic table according to the acquired current state of the battery and the current state of each vehicle load;

[0089] The power management functional unit is configured to calculate a target voltage based on the acquired current power state of the vehicle and the current load of the charging unit and under the constraint of current demand, and control the charging unit with the target voltage.

[0090] In a specific embodiment, the storage unit is integrated into the power management functional unit, which is connected to the battery and each vehicle load respectively to obtain the status information of the battery and each vehicle load, and determine the current demand in combination with the battery charging characteristic table and the vehicle load power consumption characteristic table, and provide it to the power management functional unit; the power management functional unit is used to obtain each power status information to determine whether the power status of the vehicle is in a power mode, an economic mode or a normal mode, and is also connected to the charging unit to obtain the charging unit status, mainly the charging unit load, and then adopt the corresponding control strategy according to the obtained power status to calculate the expected voltage, and finally determine the target voltage according to the voltage regulation rate requirement.

[0091] Among them, the implementation carriers of the power management functional unit and the power management functional unit are selected based on the vehicle electronic and electrical architecture, such as the body domain controller, network domain controller, vehicle domain controller, etc., and the power management functional unit is such as the power domain controller, or vehicle domain controller, etc. It can be seen that the power management functional unit and the power management functional unit are not limited to a single or two controller hardware.

[0092] It should be noted that those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and each unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0093] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0094] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including 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 the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0095] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for intelligent power management of a vehicle, characterized in that: The following steps are involved: Presetting the corresponding battery charging characteristic table and vehicle load power consumption characteristic table based on the battery charging demand and the power consumption demand of each vehicle load; According to the acquired current state of the battery and the current state of each vehicle load, query and determine the current demand in the battery charging characteristic table and the vehicle load power consumption characteristic table; According to the acquired current power state of the vehicle and the current load of the charging unit, a target voltage is calculated under the constraint of the current demand, and the charging unit is controlled with the target voltage; According to the acquired current state of the battery, the step of searching and determining the current demand in the battery charging characteristic table specifically includes: According to the acquired current capacity and current temperature of the storage battery, query and determine the lower limit requirement and the upper limit requirement of the charging voltage of the storage battery in the storage battery charging characteristic table, that is, obtain the charging voltage requirement of the storage battery; According to the acquired current state of each vehicle load, the step of searching and determining the current demand in the vehicle load power consumption characteristic table specifically includes: According to the current working state of each vehicle load obtained, query the safe voltage, voltage fluctuation range, voltage regulation rate, nominal power and priority of each vehicle load in the current working state in the vehicle load power consumption characteristic table; Determine the current safety voltage requirement, voltage fluctuation range requirement, voltage regulation rate requirement, and power requirement of the vehicle load based on the queried priorities; The step of calculating the target voltage based on the current power state of the vehicle and the current load of the charging unit and under the constraint of the current demand, and controlling the charging unit with the target voltage specifically includes: According to the acquired current power state of the vehicle, determining whether the vehicle is currently in a power mode, an economic mode or a normal mode and calculating the corresponding expected voltage according to the grid voltage demand; Calculating a target voltage according to the expected voltage and the current demand constraint, and controlling the charging unit to supply power with the target voltage; The step of determining whether the vehicle is currently in a power mode, an economic mode or a normal mode and calculating the corresponding expected voltage specifically includes: If in dynamic mode, reduce the load of the charging unit and use the lower limit of the grid voltage as the expected voltage; If in economic mode, increase or decrease the charging unit load according to the current scenario requirements. If the charging unit load is increased, the upper limit of the grid voltage requirement is used as the expected voltage. If the charging unit load is reduced, the lower limit of the grid voltage requirement is used as the expected voltage. If in normal mode, the expected voltage is calculated based on the power demand of the vehicle load.

2. The vehicle power intelligent management method according to claim 1, characterized in that: in, The steps of presetting the battery charging characteristic table based on the battery charging demand specifically include: A battery charging characteristic table is pre-set based on the charging demand of the battery, and the battery charging characteristic table includes a charging voltage lower limit set according to the difference between the current capacity of the battery and the target capacity and a charging voltage upper limit set according to the battery temperature.

3. The vehicle power intelligent management method according to claim 1, characterized in that: in, The step of presetting the vehicle load power consumption characteristic table based on the power consumption demand of each vehicle load specifically includes: A vehicle load power consumption characteristic table is pre-set based on the power consumption demand of each vehicle load, and the vehicle load power consumption characteristic table includes the safety voltage, voltage fluctuation range, voltage regulation rate, nominal power of each vehicle load, and a priority determined according to the functional safety level of each vehicle load.

4. The vehicle power intelligent management method according to claim 1, characterized in that: The step of determining the current safety voltage requirement, voltage fluctuation range requirement, voltage regulation rate requirement, and power requirement of the vehicle load based on the queried priorities specifically includes: Based on the priorities of the queried safety voltages, the intersection of the queried safety voltages is solved, and the intersection is used as the safety voltage requirement of the vehicle load. If the intersection is empty, the minimum upper limit of the queried safety voltages is used as the upper limit requirement of the safety voltage, and the lower limit of the safety voltage of the vehicle load with a higher priority is used as the lower limit requirement of the safety voltage; The minimum voltage fluctuation range among the queried voltage fluctuation ranges is used as the voltage fluctuation range requirement of the vehicle load; The minimum voltage regulation rate among the queried voltage regulation rates is used as the voltage regulation rate requirement of the vehicle load; The power demand is obtained by weighted calculation based on the queried nominal powers.

5. The vehicle power intelligent management method according to claim 4, characterized in that: The step of searching and determining the current demand in the battery charging characteristic table and the vehicle load power consumption characteristic table according to the acquired current state of the battery and the current state of each vehicle load specifically includes: Based on the voltage fluctuation range requirement of the vehicle load, the intersection of the safety voltage requirement of the vehicle load and the charging voltage requirement of the battery is solved, and the intersection is used as the grid voltage requirement. If the intersection is empty, the safety voltage lower limit requirement of the vehicle load is used as the grid voltage lower limit requirement, and the battery charging voltage upper limit requirement is used as the grid voltage upper limit requirement.

6. A vehicle power intelligent management system, which is managed by the vehicle power intelligent management method according to any one of claims 1 to 5, characterized in that: It includes a battery, a plurality of vehicle loads, a charging unit, a storage unit, a power management functional unit and a power management functional unit; The storage unit is configured to store a battery charging characteristic table set based on the charging demand of the battery and a vehicle load power consumption characteristic table set based on the power consumption demand of each of the vehicle loads; The power management functional unit is configured to query and determine the current demand in the battery charging characteristic table and the vehicle load power consumption characteristic table according to the acquired current state of the battery and the current state of each vehicle load; The power management functional unit is configured to calculate a target voltage based on the acquired current power state of the vehicle and the current load of the charging unit and under the constraint of current demand, and control the charging unit with the target voltage.

Images