Safety protection method and device of vehicle power supply system, vehicle and electronic equipment

Abstract

This application relates to a safety protection method, device, vehicle, and electronic equipment for a vehicle power supply system, and pertains to the field of vehicle technology. The method includes: when the output power of the bus is less than the load demand power, acquiring configuration information of the electrical load, wherein the configuration information shows the power consumption reduction and user perception when the electrical load is downgraded from a first power level to a second power level; the first power level and the second power level are any two of multiple power levels corresponding to the electrical load; calculating the shortfall power of the bus; and adjusting the electrical load based on the shortfall power, the power consumption reduction, and the user perception; wherein the adjusted output power is greater than or equal to the load demand power, effectively adjusting the electrical load, ensuring the safe operation of the vehicle power supply system, and improving the user experience.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, specifically to a safety protection method, device, vehicle, and electronic equipment for a vehicle power supply system. Background Technology

[0002] In the field of new energy vehicles, DC-DC converters can convert the high-voltage DC power output from the power battery into low-voltage DC power that can be directly used by low-voltage loads, providing stable power support for various low-voltage loads in the vehicle, thereby ensuring the normal operation of various vehicle systems.

[0003] However, in actual automotive operation, the operating conditions of low-voltage loads are difficult to predict accurately, and the total power demand of the load may exceed the output power of the DC-DC converter. When this happens, the output voltage of the DC-DC converter and the operating voltage of the low-voltage load will fluctuate. If effective protection measures are not taken in time, it may affect the normal operation of the low-voltage load, thereby affecting the stability and reliability of the entire vehicle power supply system.

[0004] Currently, traditional protection measures typically employ simple switching control logic, namely shutting off fixed low-voltage loads to ensure the normal operation of the DC-DC converter. However, this fixed low-voltage load shutdown strategy does not fully consider the actual user needs and user experience. Shutting off certain low-voltage loads may significantly impact the user's normal use of vehicle functions, causing inconvenience during actual use and reducing overall user satisfaction with the vehicle. Summary of the Invention

[0005] One of the purposes of this application is to provide a safety protection method, device, vehicle, and electronic equipment for a vehicle power supply system, which can effectively adjust the electrical load, ensure the safe operation of the vehicle power supply system, and improve the user experience.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0007] According to a first aspect of this application, a safety protection method for a vehicle power supply system is provided. The power supply system provides low-voltage power to electrical loads connected to a busbar. The method includes: when the output power of the busbar is less than the power demand of the load, acquiring configuration information of the electrical load, wherein the configuration information shows the power consumption reduction and user perception when the electrical load is downgraded from a first power level to a second power level; the first power level and the second power level are any two of a plurality of power levels corresponding to the electrical load; calculating the shortfall power of the busbar; and adjusting the electrical load based on the shortfall power, the power consumption reduction, and the user perception, wherein the adjusted output power is greater than or equal to the power demand of the load.

[0008] Based on the aforementioned technical means, this application can quantify users' perception of a reduction in the power load level and determine the amount of power consumption reduction during such a reduction, providing a basis for subsequent adjustments to the power load. By calculating the bus's power deficit, the required load power reduction can be identified. Subsequently, by combining multi-dimensional information such as the power consumption reduction, user perception, and the bus's power deficit, and taking into account users' experience, the power load is adjusted to balance the bus's output power with the load's power demand, thereby ensuring the safe and stable operation of the power supply system.

[0009] In one possible embodiment, the aforementioned power supply system includes a power battery and a DC-DC converter. The DC-DC converter converts the high-voltage power provided by the power battery into low-voltage power, and its output terminal is connected to a bus. Based on this, the process for determining whether the bus's output power is less than the load's required power includes: determining that the bus's output power is less than the load's required power when the output voltage of the DC-DC converter is continuously lower than a first preset voltage for a first preset time. The first preset voltage is the output voltage of the DC-DC converter when the bus cannot normally supply power to the electrical load.

[0010] According to the aforementioned technical means, when supply and demand are balanced, the output power of the bus is greater than or equal to the load demand power, and the output voltage of the DC-DC converter will maintain a stable voltage value (i.e., rated voltage). As the load demand gradually increases, the supply and demand balance is broken, and the output voltage of the DC-DC converter will be gradually pulled down. When the output voltage of the DC-DC converter drops to a certain value (i.e., the first preset voltage), normal power supply to the electrical load cannot be guaranteed. Therefore, this application can determine that the output power of the bus is less than the load demand power when it detects that the output voltage of the DC-DC converter is continuously less than the first preset voltage for a first preset time. The first preset time is set to avoid the influence of instantaneous voltage fluctuations at the output of the DC-DC converter on the judgment.

[0011] In one possible approach, the process of determining that the output power of the bus is less than the load demand power further includes: determining that the output power of the bus is less than the load demand power when the actual current of the bus is greater than the rated current of the DC-DC converter for a second consecutive preset time.

[0012] According to the aforementioned technical means, when supply and demand are balanced, the actual current of the bus is equal to the output current of the DC-DC converter, which is the rated current. As load demand gradually increases, when demand exceeds supply, the output voltage of the DC-DC converter will be pulled down. Since the rated power of the DC-DC converter is fixed, the output current will gradually increase. When the actual current of the bus exceeds the rated current of the DC-DC converter, normal power supply to the load cannot be guaranteed. Therefore, this application determines that the output power of the bus is less than the load demand when the actual current of the bus is detected to be greater than the rated current of the DC-DC converter for a continuous second preset time. The second preset time is set to avoid the influence of instantaneous current fluctuations at the output of the DC-DC converter on the judgment.

[0013] In one possible embodiment, the power supply system further includes a battery that provides supplemental low-voltage power to the bus when the output voltage of the DC-DC converter is lower than the rated voltage of the DC-DC converter. Furthermore, the process for determining that the output power of the bus is less than the load demand power further includes: determining that the output power of the bus is less than the load demand power when the output voltage of the battery is lower than a second preset voltage for a third consecutive preset time, wherein the second preset voltage is the output voltage of the battery when the bus cannot normally supply power to the electrical load.

[0014] According to the aforementioned technical means, the battery and the DC-DC converter are connected in parallel to the bus. Theoretically, the output voltage of the battery and the output voltage of the DC-DC converter should be the same. However, due to the line resistance in the connection between the battery and the DC-DC converter, the actual output voltage of the battery will be slightly lower than that of the DC-DC converter. When supply and demand are balanced, the output power of the bus is greater than or equal to the load demand, and the output voltage of the battery will remain at a stable value (i.e., the rated voltage). As the load demand gradually increases, the supply and demand balance is broken, and the output voltage of the battery will be gradually pulled down. When the output voltage of the battery drops to a certain value (i.e., the second preset voltage), normal power supply to the load cannot be guaranteed. Therefore, this application can determine that the output power of the bus is less than the load demand when it detects that the output voltage of the battery is lower than the second preset voltage for a third consecutive preset time. The third preset time is set to avoid the influence of instantaneous voltage fluctuations at the battery output on the judgment.

[0015] In one possible approach, the process of determining that the output power of the bus is less than the load demand power also includes: determining that the output power of the bus is less than the load demand power in the event of a DC-DC converter failure.

[0016] Based on the aforementioned technical means, the output power of the bus in this application is approximately equal to the output power of the DC-DC converter. When the DC-DC converter fails, the output power of the bus is approximately zero, significantly less than the load's power requirement. Therefore, when the DC-DC converter fails, it can be determined that the output power of the bus is less than the load's power requirement.

[0017] One possible approach is to calculate the bus power deficit by determining the difference between the load demand power and the rated power of the DC-DC converter as the power deficit.

[0018] In one possible approach, the calculation of load power demand includes: classifying electrical loads; calculating the total rated power of each type of electrical load; determining the equivalent power of each type of electrical load by multiplying the total rated power of each type of electrical load by its power factor; and determining the load power demand by summing the equivalent power of each type of electrical load.

[0019] Based on the above technical means, this application, by introducing a power factor, can more realistically reflect the power consumption of the electrical load in actual operation, avoid the calculation deviation caused by simply adding the rated power directly, improve the accuracy of the load demand power calculation, and provide reliable data support for subsequent adjustment of the electrical load.

[0020] One possible approach involves adjusting the electrical load based on power deficit, power consumption reduction, and user perception, including: determining the vehicle's driving status. The driving status is defined as either driving or parked.

[0021] Based on the aforementioned technical means, this application, taking into account the power deficit, power consumption reduction, and user perception, further combines the vehicle's driving status to adjust the unnecessary electrical load corresponding to the driving or parking status, thereby ensuring the stable operation of the vehicle.

[0022] In one possible approach, the electrical load is adjusted based on driving status, power deficit, power consumption reduction, and user perception. This includes: identifying electrical loads that meet a first preset condition as candidate electrical loads; wherein the first preset condition is a prohibited adjustment list for loads not in driving status. An adjustment scheme for the candidate electrical loads is generated with the goal of minimizing the total power consumption reduction of the adjusted candidate electrical loads to be greater than or equal to the power deficit and minimizing the total user perception of the adjusted candidate electrical loads. Based on the adjustment scheme, the power level of the candidate electrical loads is adjusted.

[0023] Based on the aforementioned technical means, this application avoids accidental adjustment of critical electrical loads corresponding to the vehicle's driving state (such as drive-related electrical loads during driving) by pre-setting a prohibited adjustment list. Furthermore, the goal is to ensure that the total power consumption reduction of the adjusted candidate electrical loads is greater than or equal to the power deficit while minimizing the total user-perceived impact of the adjusted candidate electrical loads. This ensures that the adjustment scheme meets the power deficit requirement while prioritizing the adjustment of electrical loads with low user-perceived impact, effectively guaranteeing the user experience.

[0024] According to a second aspect provided in this application, a safety protection device for a vehicle power supply system is provided, wherein the power supply system can provide low-voltage power to electrical loads connected to a busbar, and the device includes: an acquisition module, a calculation module, and an adjustment module.

[0025] The acquisition module is used to acquire the configuration information of the electrical load when the output power of the bus is less than the load demand power. The configuration information shows the power consumption reduction and user perception when the electrical load is downgraded from the first power level to the second power level. The first power level and the second power level are any two of the multiple power levels corresponding to the electrical load.

[0026] The calculation module is used to calculate the power deficit of the bus.

[0027] The adjustment module is used to adjust the electrical load based on the power deficit, the amount of power reduction, and user perception; wherein the adjusted output power is greater than or equal to the load demand power.

[0028] In one possible embodiment, the power supply system includes a power battery and a DC-DC converter. The DC-DC converter converts the high-voltage power provided by the power battery into low-voltage power, and its output is connected to a bus. Furthermore, the acquisition module further includes a first determining subunit. This first determining subunit is used to determine that the output power of the bus is less than the load's required power when the output voltage of the DC-DC converter is continuously less than a first preset voltage for a first preset time. The first preset voltage is the output voltage of the DC-DC converter when the bus cannot normally supply power to the load.

[0029] In one possible approach, the first determining subunit is specifically used to determine that the output power of the bus is less than the load demand power when the actual current of the bus is greater than the rated current of the DC-DC converter for a second consecutive preset time.

[0030] In one possible embodiment, the power supply system further includes a battery, which supplements the bus with low-voltage power when the output voltage of the DC-DC converter is lower than the rated voltage of the DC-DC converter. Based on this, the first determining subunit is specifically used to determine that the output power of the bus is less than the load demand power when the output voltage of the battery is lower than a second preset voltage for a third consecutive preset time; wherein the second preset voltage is the output voltage of the battery when the bus cannot normally supply power to the electrical load.

[0031] In one possible approach, the first determining subunit is specifically used to determine, in the event of a DC-DC converter failure, that the output power of the bus is less than the load demand power.

[0032] In one possible approach, the calculation module is specifically used to determine the power deficit as the difference between the load power demand and the rated power of the DC-DC converter.

[0033] In one possible implementation, the calculation module further includes: a classification subunit, a calculation subunit, a second determination subunit, and a third determination subunit. The classification subunit is used to classify the electrical loads. The calculation subunit is used to calculate the total rated power of each type of electrical load. The second determination subunit is used to determine the equivalent power consumption of each type of electrical load by multiplying the total rated power of each type of electrical load by its power coefficient. The third determination subunit is used to determine the load demand power by summing the equivalent power consumption of each type of electrical load.

[0034] In one possible embodiment, the adjustment unit further includes a fourth determining subunit and an adjustment subunit. The fourth determining subunit is used to determine the vehicle's driving state. The adjustment subunit is used to adjust the electrical load based on the driving state, power deficit, power consumption reduction, and user perception; wherein the driving state is either driving or parked.

[0035] In one possible approach, the adjustment subunit is specifically used to identify electrical loads that meet a first preset condition as candidate electrical loads; wherein the first preset condition is a prohibited adjustment list corresponding to loads not in operation. An adjustment scheme for the candidate electrical loads is generated with the goal of minimizing the total power consumption reduction of the adjusted candidate electrical loads to be greater than or equal to the power deficit and minimizing the total user-perceived power consumption of the adjusted candidate electrical loads. Based on the adjustment scheme, the power level of the candidate electrical loads is adjusted.

[0036] According to the third aspect provided in this application, a vehicle is provided in which the vehicle is protected by a safety protection method for a vehicle power supply system according to the first aspect and any possible implementation thereof.

[0037] According to a fourth aspect provided in this application, an electronic device is provided, comprising: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to execute instructions to implement the method of the first aspect described above and any possible implementation thereof.

[0038] According to a fifth aspect provided in this application, a computer-readable storage medium is provided that, when the instructions in the computer-readable storage medium are executed by a processor of an electronic device, enables the electronic device to perform the methods described in the first aspect and any possible implementation thereof.

[0039] According to the sixth aspect provided in this application, a computer program product is provided, the computer program product including computer instructions, which, when executed on an electronic device, cause the electronic device to perform the method described in the first aspect and any possible implementation thereof.

[0040] Therefore, the above-mentioned technical features of this application have the following beneficial effects:

[0041] (1) It can quantify the user's perception of the power load level reduction and determine the power consumption reduction when the power load level is reduced, providing a basis for subsequent power load adjustment. By calculating the bus's power deficit, the load power that needs to be reduced can be identified. Then, by combining the power consumption reduction, user perception, and bus power deficit, the power load can be adjusted while taking into account the user's perception experience, so that the output power of the bus and the load demand power can be balanced, thereby ensuring the safe and stable operation of the power supply system.

[0042] (2) When supply and demand are balanced, the output power of the bus is greater than or equal to the power demanded by the load, and the output voltage of the DC-DC converter will remain at a stable value (i.e., rated voltage). As the load demand gradually increases, the supply and demand balance is broken, and the output voltage of the DC-DC converter will be gradually pulled down. When the output voltage of the DC-DC converter drops to a certain value (i.e., the first preset voltage), it will be impossible to guarantee normal power supply to the load. Therefore, this application can determine that the output power of the bus is less than the power demanded by the load when it detects that the output voltage of the DC-DC converter is less than the first preset voltage for a continuous first preset time. The first preset time is set to avoid the influence of instantaneous voltage fluctuations at the output of the DC-DC converter on the judgment.

[0043] (3) By introducing the power factor, the power consumption of the load in actual operation can be more realistically reflected, avoiding the calculation deviation caused by simply adding the rated power directly, improving the accuracy of the load demand power calculation, and providing reliable data support for subsequent adjustment of the load.

[0044] (4) Based on the consideration of power deficit, power consumption reduction and user perception, and further combined with the vehicle's driving status, the unnecessary electrical load corresponding to the driving or parking status can be adjusted to ensure the stable operation of the vehicle.

[0045] (5) By pre-setting a prohibited adjustment list, it is possible to avoid accidentally adjusting the key electrical loads corresponding to the vehicle's driving state (such as the drive-related electrical loads in the driving state). In addition, the goal is to ensure that the total power consumption reduction of the candidate electrical loads after adjustment is greater than or equal to the power deficit and the total user perception of the candidate electrical loads after adjustment is minimized. This ensures that the adjustment scheme not only meets the power deficit requirement, but also prioritizes the adjustment of electrical loads with low user perception, effectively protecting the user experience. Attached Figure Description

[0046] Figure 1 An architecture diagram of a vehicle power supply system provided in this application embodiment;

[0047] Figure 2 A flowchart illustrating a safety protection method for a vehicle power supply system provided in an embodiment of this application;

[0048] Figure 3 A power consumption curve of a blower at different power levels provided for embodiments of this application;

[0049] Figure 4 A schematic diagram of the structure of a safety protection device for a vehicle power supply system provided in an embodiment of this application;

[0050] Figure 5 This is a block diagram of an electronic device provided in an embodiment of this application. Detailed Implementation

[0051] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0052] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0053] In the embodiments of this application, the words "exemplary," "for example," or "for instance" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the words "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a specific manner.

[0054] First, the relevant technologies involved in this application will be explained to facilitate understanding by those skilled in the art.

[0055] In the field of new energy vehicles, DC-DC converters play a crucial role. They can convert the high-voltage DC power output from the power battery into low-voltage DC power that can be directly used by low-voltage loads, providing stable power support for various low-voltage loads in the vehicle, thereby ensuring the normal operation of various vehicle systems.

[0056] In the actual operating conditions of new energy vehicles, the operating status of low-voltage loads is uncertain and difficult to predict accurately. This can lead to situations where the total power demand of the load exceeds the output power of the DC-DC converter. When this happens, the output voltage of the DC-DC converter and the operating voltage of the low-voltage load will fluctuate. If effective protection measures are not taken in time, it may affect the normal operation of the DC-DC converter and the low-voltage load, thereby affecting the stability and reliability of the entire vehicle power supply system.

[0057] Currently, traditional power supply system protection measures typically employ simple switching control logic, namely, shutting down fixed low-voltage loads. This fixed low-voltage load shutdown strategy does not fully consider the actual user needs and user experience. Shutting down certain low-voltage loads may significantly impact the user's normal use of vehicle functions, causing inconvenience during actual use and reducing overall user satisfaction with the vehicle.

[0058] To address the aforementioned technical problems, this application provides a safety protection method for a vehicle power supply system. This method can filter instantaneous voltage fluctuations at the output of a DC-DC converter by setting a judgment condition for a continuous first preset time, thus avoiding false triggering of power shortage judgments. Furthermore, when supply and demand are balanced (i.e., the output power of the bus is greater than or equal to the load demand), the output voltage of the DC-DC converter will maintain a stable value (i.e., rated voltage). As demand gradually increases, the supply-demand balance is disrupted, and the output voltage of the DC-DC converter will be gradually lowered. When the output voltage of the DC-DC converter drops to a certain value (i.e., the first preset voltage), normal power supply to the electrical load cannot be guaranteed. Therefore, by determining whether the output voltage of the DC-DC converter is less than the first preset voltage, it is possible to accurately identify whether the output power of the bus is less than the load demand.

[0059] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0060] The safety protection method for the vehicle power supply system provided in this application embodiment can be applied to vehicles. Vehicles can also be referred to as vehicles, mobile carriers, electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), fuel cell vehicles (FCVs), autonomous vehicles, intelligent and connected vehicles (ICVs), driverless vehicles, etc.

[0061] In this application, the vehicle can be a sedan, a sport utility vehicle (SUV), a truck, an electric vehicle, a motorcycle, a tricycle, a special vehicle (such as an ambulance, fire truck, police car, etc.), a driverless taxi, an intelligent connected bus, an autonomous logistics vehicle, an electric truck, etc. Furthermore, this method is also applicable to various special-purpose vehicles, such as agricultural vehicles, mining vehicles, forestry vehicles, airport vehicles, and port vehicles. This application does not impose specific limitations in this regard.

[0062] Figure 1 This is an architectural diagram of a vehicle power supply system provided in an embodiment of this application. Figure 1As shown, the system architecture includes: a vehicle control unit (VCU) 101 deployed in the vehicle 100, an electrical load 102, a DC-DC converter 103, a power battery 104, and a storage battery 105.

[0063] Optional, Figure 1 The VCU101 can establish communication connections with the electrical load 102, the DC-DC converter 103, the power battery 104, and the storage battery 105. The DC-DC converter 103 can establish a communication connection with the electrical load 102. The storage battery 105 can establish a communication connection with the electrical load 102. The DC-DC converter 103 can establish a communication connection with the storage battery 105. The power battery 104 can establish a communication connection with both the DC-DC converter 103 and the storage battery 105.

[0064] The DC-DC converter 103 can be used to convert the high-voltage power provided by the power battery 104 into low-voltage power and provide low-voltage power to the electrical load 102 connected to the bus. The battery 105 can be used to provide low-voltage power to the electrical load 102 connected to the bus. The VCU 101 can be used to control the DC-DC converter 103 or the battery 105 to provide low-voltage power to the electrical load 102.

[0065] In this embodiment, VCU101 can acquire configuration information of the electrical load 102 when the output power of the bus (i.e., the output power of the DC-DC converter 103) is less than the load demand power. The configuration information includes the power consumption reduction amount when the electrical load 102 is downgraded from a first power level to a second power level and the user's perceived power level. Then, VCU101 can calculate the shortfall power of the bus and adjust the electrical load 102 based on the shortfall power, the power consumption reduction amount, and the user's perceived power level.

[0066] The user perception when the power load 102 is reduced from the first power level to the second power level is used to measure the user's discomfort when the power load 102 is reduced from the first power level to the second power level. It is a value determined based on experience.

[0067] For example, an air conditioner has eight fan speed settings, each corresponding to a different power level of the blower motor. Lowering the blower motor's power level will reduce the fan speed, a change easily perceptible to the user while driving. Lowering the blower motor's power level from level 8 to level 7 results in a smaller speed adjustment, less noticeable to the user. Lowering it from level 8 to level 3 results in a larger speed adjustment, more noticeable to the user. Since level 8 is the ideal fan speed for the user, a higher perceptible speed indicates a greater deviation from the user's desired speed, leading to increased discomfort.

[0068] For example, the perceived power demand on the same electrical load 102 differs depending on whether the vehicle is in a driving or parked state. If the vehicle is parked, the user's reliance on the air conditioner outside the vehicle decreases, and the change in perceived power corresponding to reducing the blower's power level is lower than when the vehicle is in a driving state. Similarly, the vehicle's electrical load 102 can be an external discharge manager used to connect external electrical appliances (such as an induction cooker), and limiting the power level of the external discharge manager can reduce the power consumption of these appliances. If the vehicle is parked, the user's reliance on external electrical appliances increases, and the change in perceived power corresponding to reducing the external electrical appliance's power consumption is higher than when the vehicle is in a driving state.

[0069] It should be noted that the structure illustrated in the embodiments of this application does not constitute a limitation on vehicle 100. It may include more or fewer components than illustrated, or combine some components, or split some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of both.

[0070] For ease of understanding, the safety protection method of the vehicle power supply system provided in this application will be described in detail below with reference to the accompanying drawings.

[0071] Figure 2 A flowchart illustrating a safety protection method for a vehicle power supply system provided in this application embodiment is shown below. Figure 2 As shown, the method includes:

[0072] S201. When the output power of the bus is less than the power required by the load, obtain the configuration information of the electrical load.

[0073] The configuration information shows the power consumption reduction and user perception when the power load is downgraded from the first power level to the second power level. The greater the reduction in power level, the greater the corresponding power consumption reduction and the higher the user perception.

[0074] The first power level and the second power level are any two of the multiple power levels corresponding to the electrical load. The higher the power level, the greater the power consumption of the electrical load.

[0075] In some embodiments, the vehicle stores configuration information for each electrical load. When it is determined that the output power of the bus is less than the total power demand of the vehicle's electrical loads (also known as low-voltage loads), the vehicle can obtain the power consumption reduction and user perception when each electrical load is downgraded from a first power level to a second power level.

[0076] In one example, a blower is used as an example. Figure 3 The power consumption of the blower at different power levels is shown. Figure 3 The horizontal axis represents the power rating, and the vertical axis represents power consumption, with the unit being watts (W). For example... Figure 3 As shown, the power ratings of the blower can range from level 1 to level 8. Among them, level 8 is the highest power setting and the highest power consumption (300W), while level 1 is the lowest power setting and the lowest power consumption (0W).

[0077] In one example, combining the above Figure 3 Table 1 shows the configuration information of the blower, namely the power consumption reduction and user perception when the power level of the blower is downgraded from level 8 to level 7-1. For example, the power consumption reduction when the power level of the blower is downgraded from level 8 to level 7 is 90W, and the user perception is 1.

[0078] Table 1. Blower Configuration Information

[0079]

[0080] S202. Calculate the power deficit of the busbar.

[0081] In some embodiments, the vehicle can determine the load power requirement and determine the difference between the load power requirement and the rated power of the DC-DC converter as the bus power deficit. The method for calculating the load power requirement can be found in the following embodiments and will not be repeated here.

[0082] For example, the power deficit of the busbar satisfies the following formula 1.

[0083] (Formula 1).

[0084] in, Indicates the power deficit. Indicates the power demand of the load. This indicates the rated power of the DC-DC converter.

[0085] S203. Adjust the power load based on the power deficit, power consumption reduction, and user perception.

[0086] Among them, the adjusted output power is greater than or equal to the load demand power.

[0087] In some embodiments, with the output power of the adjusted bus being greater than or equal to the load demand power as a constraint, the vehicle can prioritize reducing the power load with a large power consumption reduction and low user perception, in order to minimize the impact on user experience, provided that the power demand is met.

[0088] Based on the above technical solution, the user's perception of a reduction in the power load level can be quantified, and the amount of power consumption reduction during this reduction can be determined, providing a basis for subsequent adjustments to the power load. By calculating the bus's power deficit, the required load power reduction can be identified. Then, by combining multi-dimensional information such as the power consumption reduction, user perception, and the bus's power deficit, the power load can be adjusted while taking into account the user's experience, so that the bus's output power and the load demand power are balanced, thereby ensuring the safe and stable operation of the power supply system.

[0089] In one optional implementation, the power supply system provided in this application embodiment may include: a power battery, a DC-DC converter, and a storage battery. The DC-DC converter converts the high-voltage power provided by the power battery into low-voltage power, and its output terminal is connected to the bus. The storage battery supplements the low-voltage power to the bus when the output voltage of the DC-DC converter is lower than its rated voltage. Based on this, the process of determining whether the output power of the bus is less than the load demand power in S201 may include:

[0090] In some embodiments, if the output voltage of the DC-DC converter is less than a first preset voltage for a first preset time, the vehicle can determine that the output power of the bus is less than the load demand power.

[0091] The first preset voltage is the output voltage of the DC-DC converter when the bus cannot supply power to the electrical load normally.

[0092] Optionally, the first preset voltage and the first preset time can be determined according to the actual situation. For example, the first preset voltage can be 12.7 volts (V), and the first preset time can be 5 minutes (min), 6 minutes, etc., without limitation.

[0093] For example, if the output voltage of the DC-DC converter remains below 12.7V for 5 consecutive minutes, it can be determined that the output power of the bus is less than the power required by the load.

[0094] In other embodiments, if the output voltage of the battery is less than the second preset voltage for a third consecutive preset time, the vehicle can determine that the output power of the bus is less than the load demand power.

[0095] The second preset voltage is the output voltage of the battery when the bus cannot supply power to the electrical load normally.

[0096] Optionally, the storage battery may include one or more low-voltage batteries of specifications such as 12V, 24V, and 48V, such as lead-acid batteries, lithium batteries, and sodium-ion batteries. There is no limitation on this.

[0097] Optionally, the second preset voltage and the third preset time can be determined according to the actual situation. For example, the second preset voltage can be between 11.7V and 12V, and the third preset time can be 5 minutes, 6 minutes, etc., without limitation.

[0098] For example, taking a second preset voltage of 12V as an example, if the output voltage of the battery is continuously less than 12V for 5 minutes, it can be determined that the output power of the bus is less than the power required by the load.

[0099] In other embodiments, if the actual current of the bus is greater than the rated current of the DC-DC converter for a second preset time, the vehicle can determine that the output power of the bus is less than the power required by the load.

[0100] The rated current of a DC-DC converter is determined based on its rated power and rated voltage. The rated power of a DC-DC converter can be determined according to actual conditions; for example, the rated power of a DC-DC converter can be between 2.5 kilowatts (kW) and 4 kilowatts (kW), without limitation.

[0101] For example, the rated current of a DC-DC converter satisfies the following formula 2.

[0102] (Formula 2).

[0103] in, This indicates the rated current of the DC-DC converter. This indicates the rated power of the DC-DC converter. This indicates the rated voltage of the DC-DC converter.

[0104] Optionally, the second preset time can be determined according to the actual situation. For example, the second preset time can be 5 minutes, 6 minutes, etc., and there is no limitation on this.

[0105] For example, if the actual current of the busbar is continuously less than 1 for 5 minutes... Therefore, it can be determined that the output power of the bus is less than the power required by the load.

[0106] In some other embodiments, in the event of a DC-DC converter failure, the vehicle can determine that the output power of the bus is less than the power required by the load.

[0107] Based on the above technical solution, by setting multiple judgment conditions such as continuous preset time, preset voltage, DC-DC converter rated current or fault status, the accuracy of power deficit (i.e. whether the output power of the bus is less than the load demand power) judgment can be ensured, and a basis can be provided for subsequent power load adjustment strategies.

[0108] In one optional implementation, the calculation process for the load demand power in S202 above may include: the vehicle classifying the electrical loads and calculating the total rated power of each type of electrical load. Then, the vehicle can determine the equivalent electrical power of each type of electrical load by multiplying the total rated power of each type of electrical load by the power factor of each type of electrical load. Finally, the vehicle can determine the load demand power by summing the equivalent electrical power of each type of electrical load.

[0109] Optionally, the types of electrical loads can include power domain, chassis platform, collision, thermal management system, vehicle control domain, intelligent driving domain, etc., without limitation.

[0110] In one example, as shown in Table 2, the Powertrain Domain includes electrical loads A1-An, such as air suspension, etc., without limitation. The Chassis Platform Class includes electrical loads B1-Bn, such as electric power steering controller, etc., without limitation. The Collision Class includes electrical loads C1-Cn, such as airbag control unit, etc., without limitation. The Thermal Management System Class includes electrical loads D1-Dn, such as air conditioning control unit, battery cooling controller, etc., without limitation. The Vehicle Control Domain includes electrical loads E1-En, such as lighting control module, seat control module, etc., without limitation. The Intelligent Driving Domain includes electrical loads F1-Fn, such as camera, radar, etc., without limitation.

[0111] Among them, the rated power of electrical load A1 is a1, the rated power of electrical load An is an, and the rated power of other types of electrical loads can be referred to Table 2, which will not be elaborated here.

[0112] Table 2. Classification of electrical loads and rated power of each load.

[0113]

[0114] In one example, Table 3 shows the power factor for each type of electrical load. The power factor for each type of electrical load was determined based on the ambient temperature, slope, and vehicle operating scenario during the calibration test.

[0115] Table 3 Power Factors for Each Type of Electrical Load

[0116]

[0117] For example, combining the above, the load power requirement It satisfies the following formula 3.

[0118] (Formula 3).

[0119] in, an This indicates the total rated power of electrical loads in the power domain. This indicates the total rated power of electrical loads on the chassis platform. This indicates the total rated power of the collision-type electrical loads. This indicates the total rated power of the electrical loads used in the thermal management system. This indicates the total rated power of electrical loads in the vehicle control domain. This indicates the total rated power of electrical loads in the intelligent driving domain.

[0120] Based on the above technical solution, by introducing a power factor, the actual power consumption of the electrical load can be reflected more realistically, avoiding the calculation deviation caused by simply adding the rated power directly, improving the accuracy of load demand power calculation, and providing reliable data support for subsequent adjustment of the electrical load.

[0121] In one optional implementation, S203 may specifically include: the vehicle can determine the vehicle's driving status and adjust the electrical load based on the driving status, power deficit, power consumption reduction, and user perception.

[0122] The driving status is categorized as either driving or parked. Driving status refers to the vehicle being in dynamic operation, meaning the engine drives the wheels, causing the vehicle to move on the road. Parking status refers to the vehicle being stationary after it has stopped, and being secured in place through specific operations to prevent it from sliding or moving, such as by engaging the handbrake (mechanical handbrake) or pressing the electronic parking brake button (electronic handbrake), which locks the four-wheel braking system and prevents the vehicle from rolling backwards.

[0123] In some embodiments, the vehicle can identify electrical loads that meet a first preset condition as candidate electrical loads. Then, with the goal of the total power consumption reduction of the adjusted candidate electrical loads being greater than or equal to the deficit power (hereinafter referred to as the first constraint condition) and the total user perception of the adjusted candidate electrical loads being minimized, an adjustment scheme for the candidate electrical loads is generated. Finally, the vehicle can adjust the power level of the candidate electrical loads based on the adjustment scheme.

[0124] The first preset condition is the list of prohibited adjustments that are not applicable when the vehicle is in motion. For example, the list of prohibited adjustments for driving conditions may include the engine control unit, battery management system, and sensor system, while the list of prohibited adjustments for parked conditions may include the battery management system and charging interface control unit, without limitation.

[0125] For example, the first constraint satisfies the following formulas 4 and 5, and the total user perception of the candidate electrical load satisfies the following formula 6.

[0126] (Formula 4).

[0127] (Formula 5).

[0128] in, Indicates the number of candidate electrical loads. Indicates the current power level. This indicates the power level to which the power has been reduced. Indicates the first Individual electrical loads at power rating power consumption, Indicates the first Individual electrical loads at power rating power consumption, Indicates the first Individual electrical loads from power level Downgraded to power level The amount of power consumption reduction, Indicates the first Indicator variables corresponding to each electrical load , This indicates the power deficit.

[0129] E = (Formula 6) 。

[0130] in, Indicates the first Individual electrical loads from power level Downgraded to power level E represents the total user perception of the candidate electrical load.

[0131] Based on the above technical solution, by pre-setting a prohibited adjustment list, it is possible to avoid accidental adjustment of critical electrical loads corresponding to the vehicle's driving state (such as drive-related electrical loads during driving). Furthermore, the goal is to ensure that the total power consumption reduction of the adjusted candidate electrical loads is greater than or equal to the power deficit while minimizing the total user-perceived impact of the adjusted candidate electrical loads. This ensures that the adjustment scheme meets the power deficit requirement while prioritizing the adjustment of electrical loads with low user-perceived impact, effectively guaranteeing the user experience.

[0132] Figure 4 This application provides a schematic diagram of the structure of a safety protection device for a vehicle power supply system, as shown in the embodiment of the present application. Figure 4 As shown, the safety protection device of the vehicle power supply system includes: an acquisition module 401, a calculation module 402, and an adjustment module 403.

[0133] The acquisition module 401 is used to acquire the configuration information of the electrical load when the output power of the bus is less than the load demand power. The configuration information shows the power consumption reduction and user perception when the electrical load is downgraded from the first power level to the second power level. The first power level and the second power level are any two of the multiple power levels corresponding to the electrical load.

[0134] Calculation module 402 is used to calculate the power deficit of the bus.

[0135] The adjustment module 403 is used to adjust the electrical load based on the power deficit, the amount of power consumption reduction, and the user's perception; wherein the adjusted output power is greater than or equal to the load demand power.

[0136] In one possible embodiment, the power supply system includes a power battery and a DC-DC converter. The DC-DC converter converts the high-voltage power provided by the power battery into low-voltage power, and its output is connected to the bus. Furthermore, the acquisition module 401 further includes a first determining submodule. This first determining submodule is used to determine that the output power of the bus is less than the load's required power when the output voltage of the DC-DC converter is continuously less than a first preset voltage for a first preset time. The first preset voltage is the output voltage of the DC-DC converter when the bus cannot normally supply power to the load.

[0137] In one possible approach, the first determining submodule is specifically used to determine that the output power of the bus is less than the load demand power when the actual current of the bus is greater than the rated current of the DC-DC converter for a second consecutive preset time.

[0138] In one possible embodiment, the power supply system further includes a battery, which supplements the bus with low-voltage power when the output voltage of the DC-DC converter is lower than the rated voltage of the DC-DC converter. Based on this, the first determining submodule is specifically used to determine that the output power of the bus is less than the load demand power when the output voltage of the battery is lower than a second preset voltage for a third consecutive preset time; wherein the second preset voltage is the output voltage of the battery when the bus cannot normally supply power to the electrical load.

[0139] In one possible approach, the first determining submodule is specifically used to determine, in the event of a DC-DC converter failure, that the output power of the bus is less than the load demand power.

[0140] In one possible approach, the calculation module 402 is specifically used to determine the difference between the load demand power and the rated power of the DC-DC converter as the deficit power.

[0141] In one possible embodiment, the calculation module 402 further includes: a classification submodule, a calculation submodule, a second determination submodule, and a third determination submodule. The classification submodule is used to classify electrical loads. The calculation submodule is used to calculate the total rated power of each type of electrical load. The second determination submodule is used to determine the equivalent power consumption of each type of electrical load by multiplying the total rated power of each type of electrical load by the power coefficient of each type of electrical load. The third determination submodule is used to determine the load demand power by summing the equivalent power consumption of each type of electrical load.

[0142] In one possible embodiment, the adjustment module 403 further includes a fourth determining submodule and an adjustment submodule. The fourth determining submodule is used to determine the vehicle's driving state. The adjustment submodule is used to adjust the electrical load based on the driving state, power deficit, power consumption reduction, and user perception; wherein the driving state is either driving or parked.

[0143] In one possible approach, the adjustment submodule is specifically used to identify electrical loads that meet a first preset condition as candidate electrical loads; wherein the first preset condition is a prohibited adjustment list corresponding to loads not in operation. An adjustment scheme for the candidate electrical loads is generated with the goal of minimizing the total power consumption reduction of the adjusted candidate electrical loads to be greater than or equal to the power deficit, and minimizing the total user-perceived power consumption of the adjusted candidate electrical loads. Based on the adjustment scheme, the power level of the candidate electrical loads is adjusted.

[0144] Figure 5 This is a block diagram of an electronic device provided in an embodiment of this application. (For example...) Figure 5 As shown, the electronic device includes, but is not limited to, a processor 501 and a memory 502.

[0145] The memory 502 described above is used to store the executable instructions of the processor 501. It is understood that the processor 501 is configured to execute instructions to implement the battery charging method in the above embodiments.

[0146] It should be noted that those skilled in the art will understand that Figure 5 The electronic device structure shown does not constitute a limitation on the electronic device; the electronic device may include, but is not limited to, other electronic devices. Figure 5 This may indicate more or fewer components, or a combination of certain components, or a different arrangement of components.

[0147] Processor 501 is the control center of the electronic device. It connects various parts of the electronic device via various interfaces and lines. By running or executing software programs and / or modules stored in memory 502, and by calling data stored in memory 502, it performs various functions and processes data, thereby providing overall monitoring of the electronic device. Processor 501 may include one or more processing units. Optionally, processor 501 may integrate an application processor and a modem processor. The application processor mainly handles the operating system, user interface, and applications, while the modem processor mainly handles wireless communication. It is understood that the modem processor may not be integrated into processor 501.

[0148] The memory 502 can be used to store software programs and various data. The memory 502 may primarily include a program storage area and a data storage area. The program storage area may store the operating system, application programs required by at least one functional module (such as a determination unit, processing unit, etc.), etc. Furthermore, the memory 502 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device.

[0149] In an exemplary embodiment, a computer-readable storage medium including instructions is also provided, such as a memory 502 including instructions, which can be executed by a processor 501 of an electronic device to implement the methods in the above embodiments.

[0150] In actual implementation, Figure 4 The functions of the acquisition module 401, calculation module 402, and adjustment module 403 can all be provided by... Figure 5 The processor 501 calls the computer program stored in the memory 502 to implement the process. The specific execution process can be found in the description of the method section in the previous embodiment, and will not be repeated here.

[0151] Optionally, the computer-readable storage medium may be a non-transitory computer-readable storage medium, such as a read-only memory (ROM), random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device.

[0152] In an exemplary embodiment, this application also provides a computer program product including one or more instructions, which can be executed by a processor 501 of an electronic device to perform the methods described above.

[0153] It should be noted that when one or more instructions in the computer-readable storage medium or computer program product are executed by the processor of an electronic device, they implement the various processes of the above method embodiments and achieve the same technical effect as the above method. To avoid repetition, they will not be described again here.

[0154] Through the above description of the embodiments, those skilled in the art can clearly understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0155] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another apparatus, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0156] The units described as separate components may or may not be physically separate. A component shown as a unit can be one or more physical units; that is, it can be located in one place or distributed in multiple different locations. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0157] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0158] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solutions of the embodiments of this application, essentially, or the parts that contribute to the prior art, or all or part of the technical solutions, can be embodied in the form of a software product. This software product is stored in a storage medium and includes several instructions to cause a device (which may be a microcontroller, chip, etc.) or processor to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0159] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A safety protection method for a vehicle power supply system, the power supply system comprising: Power batteries and DC-DC converters; The DC-DC converter is used to convert the high-voltage power provided by the power battery into low-voltage power. The output of the DC-DC converter is connected to the bus. The power supply system provides low-voltage power to the electrical loads connected to the busbar; characterized in that the method includes: When the output power of the bus is less than the load demand power, the configuration information of the electrical load is obtained. The configuration information includes the correspondence between multiple power level reduction amounts, power consumption reduction amounts, and user perception. The larger the power level reduction amount, the larger the power consumption reduction amount, and the higher the user perception. In different driving states, the user perception corresponding to the same power level reduction amount of the same electrical load is different. The driving state is driving or parking. Calculate the power deficit of the busbar; Multiple candidate electrical loads are determined from the electrical loads; Based on the driving status, with the goal of the total power consumption reduction of the multiple candidate power loads after adjustment being greater than or equal to the deficit power, and the total user perception of the multiple candidate power loads after adjustment being minimized, an adjustment scheme for multiple candidate power loads is generated; the adjustment scheme includes prioritizing the reduction of power consumption of power loads with large power consumption reduction and low user perception. Based on the adjustment scheme, the power levels of multiple candidate electrical loads are adjusted.

2. The safety protection method for a vehicle power supply system according to claim 1, characterized in that, The process of determining that the output power of the bus is less than the load demand power includes: If the output voltage of the DC-DC converter is less than a first preset voltage for a first preset time, it is determined that the output power of the bus is less than the load demand power. Wherein, the first preset voltage is the output voltage of the DC-DC converter when the bus cannot supply power to the electrical load normally.

3. The safety protection method for a vehicle power supply system according to claim 2, characterized in that, The process of determining that the output power of the bus is less than the load demand power also includes: If the actual current of the busbar is greater than the rated current of the DC-DC converter for a second consecutive preset time, it is determined that the output power of the busbar is less than the load demand power.

4. The safety protection method for a vehicle power supply system according to claim 2, characterized in that, The power supply system also includes a battery; the battery provides low-voltage power to the bus when the output voltage of the DC-DC converter is less than the rated voltage of the DC-DC converter. The process of determining that the output power of the bus is less than the load demand power also includes: If the output voltage of the battery is less than the second preset voltage for a third consecutive preset time, it is determined that the output power of the bus is less than the load demand power. The second preset voltage is the output voltage of the battery when the bus cannot supply power to the electrical load normally.

5. The safety protection method for a vehicle power supply system according to any one of claims 2-4, characterized in that, The process of determining that the output power of the bus is less than the load demand power also includes: In the event of a fault in the DC-DC converter, it is determined that the output power of the bus is less than the power required by the load.

6. The safety protection method for a vehicle power supply system according to claim 1, characterized in that, The calculation of the power deficit of the bus includes: The difference between the load power requirement and the rated power of the DC-DC converter is determined as the shortfall power.

7. The safety protection method for a vehicle power supply system according to claim 1 or 6, characterized in that, The calculation process for the load power requirement includes: The electrical loads are classified. Calculate the total rated power for each type of electrical load; The equivalent power of each type of electrical load is determined by multiplying the total rated power of each type of electrical load by the power factor of each type of electrical load. The sum of the equivalent power consumption of each type of electrical load is determined as the load demand power.

8. The safety protection method for a vehicle power supply system according to claim 1, characterized in that, The step of determining multiple candidate electrical loads from the electrical loads includes: Determine the driving status of the vehicle; wherein the driving status is driving or parked; Multiple electrical loads that meet the first preset condition are identified as multiple candidate electrical loads; wherein, the first preset condition is a list of prohibited adjustments that are not in the driving state.

9. A safety protection device for a vehicle power supply system, wherein the power supply system provides low-voltage power to electrical loads connected to a busbar; characterized in that, The device includes: The acquisition module is used to acquire configuration information of the electrical load when the output power of the bus is less than the load demand power. The configuration information includes the correspondence between multiple power level reduction amounts, power consumption reduction amounts, and user perception. The larger the power level reduction amount, the larger the power consumption reduction amount, and the higher the user perception. The user perception corresponding to the same power level reduction amount of the same electrical load is different under different driving conditions. The driving conditions are driving or parking. The calculation module is used to calculate the power deficit of the busbar and determine multiple candidate electrical loads from the electrical loads. An adjustment module is configured to generate an adjustment scheme for multiple candidate electrical loads based on the driving status, with the goal of achieving a total power consumption reduction greater than or equal to the deficit power and minimizing the total user perception of the multiple candidate electrical loads after adjustment; the adjustment scheme includes prioritizing the reduction of power consumption with a large reduction and low user perception. Based on the adjustment scheme, the power levels of multiple candidate electrical loads are adjusted.

10. A vehicle, characterized in that, The vehicle is protected by a safety protection method for the vehicle power supply system as described in any one of claims 1-8.

11. An electronic device, characterized in that, include: processor; Memory used to store the processor's executable instructions; The processor is configured to execute the instructions to implement the safety protection method for the vehicle power supply system as described in any one of claims 1-8.

12. A computer-readable storage medium, characterized in that, When the computer-executable instructions stored in the computer-readable storage medium are executed by the processor of the processing device, the processing device is able to perform the safety protection method for the vehicle power supply system as described in any one of claims 1-8.

13. A computer program product, characterized in that, The computer program product includes the computer program, which is adapted to be loaded by a processor and execute the safety protection method for the vehicle power supply system as described in any one of claims 1-8.

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