CN113147631B - Output power determination method of low-voltage converter and related equipment - Google Patents

Abstract

The invention relates to the field of automobiles, in particular to an output power determining method of a low-voltage converter and related equipment. Wherein, the method comprises the following steps: acquiring the percentage of the residual electric quantity and the percentage of the health degree of the battery of the low-voltage storage battery; determining whether the battery health percentage is greater than a first threshold; if the percentage of health of the battery is larger than a first threshold value, determining the output power of the low-voltage converter according to the percentage of the remaining electric quantity; and sending a control command to a low-voltage converter according to the determined output power so as to enable the low-voltage converter to provide low-voltage power for the low-voltage storage battery at the output power. In the embodiment of the invention, the state of the low-voltage storage battery is determined by acquiring the percentage of the residual electric quantity and the percentage of the health degree of the low-voltage storage battery, and the output power of the low-voltage converter is determined according to the state of the low-voltage storage battery.

Description

A method for determining the output power of a low-voltage voltage converter and related equipment

【Technical field】

The invention relates to the field of automobiles, in particular to a method for determining the output power of a low-voltage voltage converter and related equipment.

【Background technique】

The low-voltage voltage converter is an essential part of the car. The low-voltage voltage converter can convert the high-voltage power output from the power battery or generator into a low-voltage power source, thereby supplying power to the low-voltage battery and various on-board equipment, thereby ensuring the low-voltage electrical equipment of the car. availability. The output power of the low-voltage voltage converter often depends on the current total load power of the vehicle. When the total load power required by the low-voltage electrical equipment of the vehicle is high, the output power of the low-voltage voltage converter is relatively high; when the total load required by the low-voltage electrical equipment of the vehicle is low, the output power of the low-voltage voltage converter is also relatively high. Low. However, when the low-voltage voltage converter is in a low power output state, the generated energy loss is large and the conversion efficiency is low, resulting in a large waste of electricity and reducing the power economy of the vehicle.

【Content of invention】

In order to solve the above problems, an embodiment of the present invention provides a method for determining the output power of a low-voltage voltage converter and related equipment, which determine the output power of the low-voltage voltage converter according to the state of the low-voltage battery.

In the first aspect, an embodiment of the present invention provides a method for determining the output power of a low-voltage voltage converter, the method is applied to a vehicle controller, and includes:

Obtain the remaining power percentage and battery health percentage of the low-voltage battery;

determining whether the battery health percentage is greater than a first threshold;

If the battery health percentage is greater than a first threshold, determining the output power of the low-voltage voltage converter according to the remaining power percentage;

Sending a control command to the low-voltage voltage converter according to the determined output power, so that the low-voltage voltage converter provides low-voltage power to the low-voltage storage battery with the output power.

In the embodiment of the present invention, the state of the low-voltage battery is judged by obtaining the remaining power percentage and battery health percentage of the low-voltage battery, and the output power of the low-voltage voltage converter is determined according to the state and the remaining power percentage of the low-voltage battery. In this way, the waste of electricity caused by determining the output power of the low-voltage voltage converter only according to the actual power demand of the vehicle can be avoided.

In a possible implementation manner, if the battery health percentage is greater than a first threshold, determining the output power of the low-voltage voltage converter according to the remaining power percentage includes:

determining whether the remaining power percentage is greater than a second threshold;

If the remaining power percentage is greater than the second threshold, determine that the low-voltage converter does not output low-voltage power;

If the remaining power percentage is less than or equal to the second threshold and greater than a third threshold, then determine the output power of the low-voltage voltage converter according to the power conversion efficiency characteristics of the low-voltage voltage converter;

If the remaining power percentage is less than or equal to the third threshold, the output power of the low-voltage voltage converter is determined according to the actual power demand of the vehicle.

In a possible implementation, it also includes:

If the output power of the low-voltage voltage converter is determined according to the power conversion efficiency characteristics of the low-voltage voltage converter, determining whether the output power is greater than the actual power demand of the vehicle;

If the output power is greater than the actual demand power, determine a first difference power between the output power and the actual demand power, and control the low-voltage voltage converter to use the first difference power to the Low-voltage battery for charging;

If the output power is less than the actual required power, determining a second difference power between the output power and the actual required power;

The low-voltage battery is controlled to provide a low-voltage power supply for the vehicle with the second differential power in cooperation with the low-voltage voltage converter.

In a possible implementation, if the remaining power percentage and the battery health percentage of the low-voltage battery are not obtained, the vehicle body controller collects the voltage value in the low-voltage circuit of the vehicle;

According to the voltage value, the output power of the low-voltage voltage converter is determined.

In a possible implementation manner, determining the output power of the low-voltage voltage converter according to the voltage value includes:

determining whether the voltage value is greater than a fourth threshold;

If the voltage value is greater than the fourth threshold, determine that the low-voltage voltage converter does not output low-voltage power;

If the voltage value is less than the fourth threshold, the output power of the low-voltage voltage converter is determined according to the actual power demand of the vehicle.

In a possible implementation, it also includes:

If the battery health percentage is less than the first threshold, displaying a prompt message to replace the low-voltage battery to determine the output power of the low-voltage voltage converter according to the actual power demand of the vehicle.

In a second aspect, an embodiment of the present invention provides a vehicle controller, including:

An acquisition module, configured to acquire the percentage of remaining power and the percentage of battery health of the low-voltage storage battery;

a processing module, configured to determine whether the battery health percentage is greater than a first threshold;

The processing module is further configured to determine the output power of the low-voltage voltage converter according to the remaining power percentage if the battery health percentage is greater than a first threshold;

A sending module, configured to send a control command to the low-voltage voltage converter according to the determined output power, so that the low-voltage voltage converter provides low-voltage power to the low-voltage storage battery with the output power.

In a possible implementation manner, the processing module is specifically configured to:

determining whether the remaining power percentage is greater than a second threshold;

If the remaining power percentage is greater than the second threshold, determine that the low-voltage converter does not output low-voltage power;

If the remaining power percentage is less than or equal to the second threshold and greater than a third threshold, then determine the output power of the low-voltage voltage converter according to the power conversion efficiency characteristics of the low-voltage voltage converter;

If the remaining power percentage is less than or equal to the third threshold, the output power of the low-voltage voltage converter is determined according to the actual power demand of the vehicle.

In a possible implementation manner, the vehicle controller includes:

at least one processor; and

at least one memory communicatively coupled to the processor, wherein:

The memory stores program instructions executable by the processor, and the processor can execute the method described in the first aspect by calling the program instructions.

In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, where the computer-readable storage medium stores computer instructions, and the computer instructions cause the computer to execute the method described in the first aspect.

It should be understood that the second to third aspects of the embodiments of the present invention are consistent with the technical solutions of the first aspect of the embodiments of the present invention, and the beneficial effects obtained by the various aspects and corresponding feasible implementation modes are similar, so details are not repeated here.

【Description of drawings】

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some examples of the embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

FIG. 1 is a flowchart of a method for determining output power of a low-voltage voltage converter provided by an embodiment of the present invention;

FIG. 2 is a flow chart of another method for determining output power of a low-voltage voltage converter provided by an embodiment of the present invention;

FIG. 3 is a flow chart of another method for determining output power of a low-voltage voltage converter provided by an embodiment of the present invention;

FIG. 4 is a flowchart of another method for determining output power of a low-voltage voltage converter provided by an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of a vehicle controller provided by an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of another vehicle controller provided by an embodiment of the present invention.

【Detailed ways】

In order to better understand the technical solutions of the present specification, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

It should be clear that the described embodiments are only some of the embodiments in this specification, not all of them. Based on the embodiments in this specification, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

Terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the description. As used in the embodiments of the present invention and the appended claims, the singular forms "a", "said" and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.

In the embodiment of the present invention, the output power of the low-voltage voltage converter is determined according to the remaining power percentage of the low-voltage battery and the percentage of battery health, and the determined output power is sent to the low-voltage voltage converter in the form of a control command, avoiding Determining the output power of the low-voltage voltage converter based on the actual required power of the vehicle leads to a reduction in vehicle power economy.

FIG. 1 is a flowchart of a method for determining output power of a low-voltage voltage converter applied to a vehicle controller provided by an embodiment of the present invention. As shown in Figure 1, the method includes:

Step 101, obtain the remaining power percentage and the battery health percentage of the low-voltage storage battery. Among them, the battery health (State of Health, SOH) percentage is the percentage of the current available capacity of the low-voltage battery and the factory capacity, and the current state of the low-voltage battery is judged by the SOH and the remaining power percentage (State of Charge, SOC). Specifically, the SOC and SOH of the low-voltage battery can be collected by the battery power sensor connected to the low-voltage battery, and the collected SOC and SOH data can be sent to the body controller (Body Control Module, BCM) through the LIN bus, and the BCM can then Send the SOC and SOH data to the vehicle controller (Vehicle Control Unit, VCU).

Step 102, determine whether the battery health percentage is greater than a first threshold. Wherein, it may be determined whether the health state of the low-voltage battery is healthy by setting a first threshold, and optionally, the first threshold may be set to 80%.

Step 103, if the battery health percentage is greater than the first threshold, then determine the output power of the low-voltage voltage converter according to the remaining power percentage. If the SOH of the low-voltage battery is greater than the first threshold, it means that the low-voltage battery is in good health, and the output power of the low-voltage voltage converter can be determined according to the SOC of the low-voltage battery.

In some embodiments, if the SOH is less than the first threshold, a prompt message to replace the low-voltage battery may be displayed and the output power of the low-voltage voltage converter may be determined according to the actual power demand of the vehicle. Optionally, the prompt information may be informed by lighting a designated prompt light or displaying relevant prompt information on the dashboard.

Step 104: Send a control command to the low-voltage voltage converter according to the determined output power, so that the low-voltage voltage converter provides low-voltage power to the low-voltage battery with the output power. Among them, the determined output power can be the total output power output by the low-voltage voltage converter converting the high voltage provided by the power battery into a low-voltage power supply. At this time, the low-voltage voltage converter performs simultaneous Low voltage power supply.

In some embodiments, in step 103, if the SOH is greater than the first threshold, the specific implementation of determining the output power of the low-voltage voltage converter according to the SOC is as shown in Figure 2:

Step 201, determine whether the remaining power percentage is greater than a second threshold. If the remaining power percentage is greater than the second threshold, step 202 is performed, and if the remaining power percentage is less than or equal to the second threshold, step 203 is performed. Optionally, the second threshold may be 90%.

Step 202, determining that the low-voltage voltage converter does not output low-voltage power. At this time, since the SOC is greater than the second threshold, it means that the power stored in the low-voltage battery is close to full power at this time, and the low-voltage battery can provide low-voltage power for the car, and the low-voltage voltage converter is in a non-working state. The loss caused by the conversion of high-voltage power to low-voltage power.

Step 203, determine whether the remaining power percentage is greater than a third threshold, and if the remaining power percentage is greater than the third threshold, perform step 204. If the remaining power percentage is less than or equal to the third threshold, step 205 is performed. Optionally, the third threshold may be 50%.

Step 204: Determine the output power of the low-voltage voltage converter according to the power conversion efficiency characteristics of the low-voltage voltage converter. Wherein, the power conversion efficiency characteristic is the conversion efficiency when the low-voltage voltage converter performs low-voltage output with different output power. As the output power increases, the corresponding conversion efficiency will first increase and then decrease. Correspondingly, the losses generated during the power conversion process will first decrease and then increase. Specifically, the corresponding output power when the conversion efficiency of the low-voltage voltage converter is high may be determined according to the power conversion efficiency characteristics, and the power may be determined as the output power of the low-voltage voltage converter.

Fig. 3 is a conversion efficiency characteristic diagram of a low-voltage voltage converter provided by an embodiment of the present invention. As shown in Fig. 3, the input voltage is the high-voltage power supply output from the power battery to the low-voltage voltage converter, and the output voltage is the low-voltage voltage that converts the power The high-voltage power supply provided by the battery is converted to a low-voltage power supply, and the load is the sum of the power required by all low-voltage electrical appliances in the car.

Step 205, determine the output power of the low-voltage voltage converter according to the actual power demand of the vehicle. At this time, the SOC of the low-voltage battery is lower than the third threshold, indicating that the remaining power in the low-voltage battery is small, and the low-voltage battery needs to be charged by the low-voltage voltage converter, and all the low-voltage electrical appliances of the car are assumed by the low-voltage voltage converter. power supply of the load.

In some embodiments, if the output power of the low-voltage voltage converter is determined according to the power conversion efficiency characteristics of the low-voltage voltage converter, it needs to be determined whether the output power is greater than the actual required power of the vehicle.

If the output power is greater than the actual demand power, determine a first difference power between the output power and the actual demand power, and control the low-voltage voltage converter to use the first difference power to the The low-voltage battery is charged. Specifically, since the determined output power is greater than the current actual demand power of the vehicle, the low-voltage voltage converter alone provides the low-voltage power supply to the vehicle at this time, and provides the first differential power part greater than the actual demand power to the low-voltage battery to The low-voltage battery is charged, and the low-voltage battery is in a non-output state at this time.

If the output power is less than the actual demand power, then determine a second difference power between the output power and the actual demand power. And controlling the low-voltage battery to provide low-voltage power for the vehicle with the second differential power in cooperation with the low-voltage voltage converter. At this time, since the determined output power is less than the current actual power demand of the vehicle, in order to meet the power demand of the vehicle, the low-voltage battery needs to make up for the missing second differential power.

In a specific example, the above-mentioned conversion efficiency can be obtained by the formula Pe=Pw/Pw+Pd1+Pd2, wherein, Pe is the conversion efficiency, Pw is the above-mentioned load, and Pd1 is the loss generated by the low-voltage voltage converter when performing low-voltage conversion, Pd2 is the loss generated when the low-voltage voltage converter charges the low-voltage battery. Therefore, when the load is 125w, if the traditional low-voltage voltage output method is used, that is, as much power as the load requires, the low-voltage voltage converter will provide as much power. Then Pw=125 at this time, Pd1=38.19, Pd2=0, and the corresponding conversion efficiency is Pe=125/(125+38.19)=76.6%. If the method of the present invention is adopted to increase the vehicle load to 374w, and use the 249w beyond the 125w load to charge the low-voltage battery, then at this time Pw=374, Pd1=31.2, Pd2=24.9, the corresponding conversion efficiency Pe=374/(374+31.2+24.9)=86.9%. It can be seen that, by adopting the method provided by the embodiment of the present invention, the conversion efficiency can be increased by 10.3%, so that the power economy of the vehicle can be improved.

In some embodiments, since the battery power sensor cannot measure the accurate SOC and SOH of the low-voltage battery immediately after it is started, the battery power sensor needs to run stably for a period of time before collecting accurate SOC and SOH of the low-voltage battery. Therefore, if the vehicle controller does not obtain the remaining power percentage and battery health percentage of the low-voltage battery, the vehicle body controller collects the voltage value in the low-voltage circuit of the vehicle, and determines the low-voltage voltage converter according to the voltage value. output power, the specific processing steps of the method are as shown in Figure 4:

Step 401, determine whether the voltage value is greater than a fourth threshold. If the voltage value is greater than the fourth threshold, perform step 402 . If the voltage value is less than the fourth threshold, go to step 403 . Optionally, the fourth threshold may be 13.5 volts.

Step 402, determining that the low-voltage voltage converter does not output low-voltage power.

Step 403, determine the output power of the low-voltage voltage converter according to the actual power demand of the vehicle.

In a specific example, the step of determining the output power of the low-voltage voltage converter may be as follows: first obtain the calibration status of the battery power sensor, and the calibration statuses are: uncalibrated, in calibration, and calibration completed. Specifically, uncalibrated means that the battery power sensor cannot currently collect SOH and SOC, during calibration means that only SOC can be collected but SOH cannot be detected, and when calibration is completed, it means that SOC and SOH can be collected. If the calibration status of the battery power sensor is uncalibrated, it is necessary to obtain the voltage value of the low-voltage circuit collected by the body controller. If the voltage value is greater than 13.5 volts, the vehicle controller controls the low-voltage voltage converter to be enabled and disabled, that is, no low-voltage Power Output. If the voltage value is less than 13.5 volts, the low-voltage voltage converter is controlled to output the low-voltage power supply with the actual required power of the vehicle.

If the calibration status of the battery power sensor is calibration completed, it means that the SOC and SOH of the low-voltage battery can be obtained at this time. At this time, you can first judge whether the SOH is greater than 80%. If the SOH value is less than 80%, it means that the health of the battery is low. Low, the use time is long, the user can be reminded to replace the low-voltage battery through instruments and other means, and the low-voltage voltage converter is controlled to output the low-voltage power supply with the actual power required by the vehicle. If the SOH value is greater than 80%, it can be determined whether the SOC is greater than 90%. If the SOC is greater than 90%, it means that the low-voltage battery has sufficient power and does not need to be charged, and the low-voltage voltage converter can be controlled not to output low-voltage power. If the SOC is less than 90% and greater than 50%, an output power with high conversion efficiency can be determined according to the power conversion efficiency characteristics of the low-voltage voltage converter, and the low-voltage voltage converter is controlled to output the low-voltage with the determined output power with high conversion efficiency power supply. If the SOC is less than 50%, it means that the power in the low-voltage battery is low at this time, and the low-voltage voltage converter can be controlled to output the low-voltage power supply with the actual power required by the vehicle.

If the calibration state of the battery power sensor is in calibration, only the SOC of the low-voltage battery can be obtained at this time, but the SOH of the low-voltage battery cannot be obtained, so the accurate state of the low-voltage battery cannot be determined, so the judgment threshold can be increased, for example, SOC at 60 % to 90%, the vehicle controller controls the low-voltage voltage converter to output the low-voltage power supply with the output power of high conversion efficiency determined by the power conversion efficiency characteristics. If the SOC is lower than 60%, the vehicle controller controls the low-voltage voltage converter to output the low-voltage power supply with the actual required power of the vehicle. If the SOC is greater than 90%, the vehicle controller controls the low-voltage voltage converter to stop the output of the low-voltage power supply.

Specifically, the total required power of the medium and low-voltage electrical appliances in the vehicle changes. When the low-voltage voltage converter outputs low-voltage power with the output power of high conversion efficiency, if the output power of the low-voltage voltage converter is less than the required power of the vehicle's low-voltage electrical appliances, the low-voltage battery can be controlled to output low-voltage power to compensate for the lack of power Complete. If the output power of the low-voltage voltage converter is greater than the required power of the vehicle's low-voltage electrical appliances, the low-voltage battery can be charged with the excess power required by the low-voltage electrical appliances.

Corresponding to the method for determining the output power of the above-mentioned low-voltage voltage converter, an embodiment of the present invention provides a schematic structural diagram of a vehicle controller, as shown in FIG. 5 , the vehicle controller includes: an acquisition module 501, a processing module 502 and a sending module 503.

The obtaining module 501 is used to obtain the remaining power percentage and the battery health percentage of the low-voltage storage battery.

A processing module 502, configured to determine whether the battery health percentage is greater than a first threshold;

The processing module 502 is further configured to determine the output power of the low-voltage voltage converter according to the remaining power percentage if the battery health percentage is greater than the first threshold.

The sending module 503 is configured to send a control instruction to the low-voltage voltage converter according to the determined output power, so that the low-voltage voltage converter provides low-voltage power to the low-voltage storage battery with the output power.

In some embodiments, the processing module 502 is specifically used for:

It is determined whether the remaining battery percentage is greater than a second threshold.

If the remaining power percentage is greater than the second threshold, it is determined that the low-voltage converter does not output low-voltage power.

If the remaining power percentage is less than or equal to the second threshold and greater than the third threshold, the output power of the low-voltage voltage converter is determined according to the power conversion efficiency characteristics of the low-voltage voltage converter.

If the remaining power percentage is less than or equal to the third threshold, the output power of the low-voltage voltage converter is determined according to the actual power demand of the vehicle.

The vehicle controller provided by the embodiment shown in FIG. 5 can be used to implement the technical solutions of the method embodiments shown in FIGS. 1 to 4 in this specification. For the implementation principle and technical effect, further reference can be made to the relevant descriptions in the method embodiments.

Fig. 6 is a structural schematic diagram of another vehicle controller provided by an embodiment of the present invention. As shown in Fig. 6, the vehicle controller may include at least one processor; and at least one memory communicated with the processor, Wherein: the memory stores program instructions that can be executed by the processor, and the processor invokes the program instructions to execute the method for determining the output power of the low-voltage voltage converter provided by the embodiments shown in FIGS. 1 to 4 of this specification.

As shown in Figure 6, the vehicle controller is represented in the form of a general-purpose computing device. Components of the vehicle controller may include but not limited to: one or more processors 610 , communication interface 620 and memory 630 , and communication bus 640 connecting different system components (including memory 630 , communication interface 620 and processing unit 610 ).

Communication bus 640 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or a local bus using any of a variety of bus structures. For example, these architectures include but are not limited to Industry Standard Architecture (Industry Standard Architecture; hereinafter referred to as: ISA) bus, Micro Channel Architecture (Micro Channel Architecture; hereinafter referred to as: MAC) bus, enhanced ISA bus, video electronics standard Association (Video Electronics Standards Association; hereinafter referred to as: VESA) local bus and peripheral component interconnection (Peripheral Component Interconnection; hereinafter referred to as: PCI) bus.

Vehicle controllers typically include a variety of computer system readable media. These media can be any available media that can be accessed by the vehicle controller, including volatile and non-volatile media, removable and non-removable media.

The memory 630 may include a computer system-readable medium in the form of a volatile memory, such as a random access memory (Random Access Memory; RAM for short) and/or a cache memory. The vehicle controller may further include other removable/non-removable, volatile/nonvolatile computer system storage media. The memory 630 may include at least one program product having a set (for example, at least one) of program modules configured to perform the functions of the various embodiments of this specification.

A program/utility having a set (at least one) of program modules may be stored in memory 730, such program modules including - but not limited to - an operating system, one or more application programs, other program modules, and program data , each or some combination of these examples may include implementations of network environments. Program modules usually execute the functions and/or methods in the embodiments described in this specification.

The processor 610 executes various functional applications and data processing by running the programs stored in the memory 630, for example, implementing the method for determining the output power of the low-voltage voltage converter provided in the embodiments shown in FIGS. 1 to 4 of this specification.

The embodiment of this specification provides a computer-readable storage medium, the computer-readable storage medium stores computer instructions, and the computer instructions cause the computer to execute the low-voltage voltage converter provided in the embodiments shown in Figures 1 to 4 of this specification The output power determination method.

Any combination of one or more computer-readable storage media may be used for the above-mentioned computer-readable storage medium. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (non-exhaustive list) of computer-readable storage media include: electrical connections with one or more conductors, portable computer disks, hard disks, random access memory (RAM), read-only memory (ReadOnly Memory; hereinafter referred to as: ROM), erasable programmable read-only memory (Erasable Programmable ReadOnly Memory; hereinafter referred to as: EPROM) or flash memory, optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, Or any suitable combination of the above. In this document, a computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

The foregoing describes specific embodiments of this specification. Other implementations are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. Multitasking and parallel processing are also possible or may be advantageous in certain embodiments.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structures, materials or features are included in at least one embodiment or example of this specification. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of this specification, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

Any process or method descriptions in flowcharts or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing custom logical functions or steps of a process , and the scope of preferred embodiments of this specification includes alternative implementations in which functions may be performed out of the order shown or discussed, including in substantially simultaneous fashion or in reverse order depending on the functions involved, which shall It should be understood by those skilled in the art to which the embodiments of this specification belong.

Depending on the context, the word "if" as used herein may be interpreted as "at" or "when" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrases "if determined" or "if detected (the stated condition or event)" could be interpreted as "when determined" or "in response to the determination" or "when detected (the stated condition or event) )" or "in response to detection of (a stated condition or event)".

It should be noted that the devices involved in the embodiments of this specification may include, but are not limited to, personal computers (Personal Computer; hereinafter referred to as: PC), personal digital assistants (Personal Digital Assistant; hereinafter referred to as: PDA), wireless handheld devices, tablet Computer (Tablet Computer), mobile phone, MP3 display, MP4 display, etc.

In the several embodiments provided in this specification, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined Or it can be integrated into another system, or some features can be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

In addition, each functional unit in each embodiment of this specification may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware, or in the form of hardware plus software functional units.

The above-mentioned integrated units implemented in the form of software functional units may be stored in a computer-readable storage medium. The above-mentioned software functional units are stored in a storage medium, and include several instructions to enable a computer device (which may be a personal computer, a connector, or a network device, etc.) or a processor (Processor) to execute the methods described in various embodiments of this specification part of the steps. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory; hereinafter referred to as ROM), random access memory (Random Access Memory; hereinafter referred to as RAM), magnetic disk or optical disc, etc. A medium on which program code can be stored.

The above descriptions are only preferred embodiments of this specification, and are not intended to limit this specification. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this specification shall be included in this specification. within the scope of protection.

Claims (8)

1. A method for determining the output power of a low-voltage voltage converter, characterized in that the method is applied to a vehicle controller, comprising: Obtain the remaining power percentage and battery health percentage of the low-voltage battery; determining whether the battery health percentage is greater than a first threshold; If the battery health percentage is greater than a first threshold, determining the output power of the low-voltage voltage converter according to the remaining power percentage; sending a control command to the low-voltage voltage converter according to the determined output power, so that the low-voltage voltage converter provides low-voltage power to the low-voltage storage battery with the output power; Wherein, determining the output power of the low-voltage voltage converter according to the remaining power percentage includes: determining whether the remaining power percentage is greater than a second threshold; If the remaining power percentage is greater than the second threshold, determine that the low-voltage converter does not output low-voltage power; If the remaining power percentage is less than or equal to the second threshold and greater than a third threshold, then determine the output power of the low-voltage voltage converter according to the power conversion efficiency characteristics of the low-voltage voltage converter; If the remaining battery percentage is less than or equal to the third threshold, the output power of the low-voltage voltage converter is determined according to the actual power demand of the vehicle. 2. The method according to claim 1, further comprising: If the output power of the low-voltage voltage converter is determined according to the power conversion efficiency characteristics of the low-voltage voltage converter, determining whether the output power is greater than the actual power demand of the vehicle; If the output power is greater than the actual demand power, determine a first difference power between the output power and the actual demand power, and control the low-voltage voltage converter to use the first difference power to the Low-voltage battery for charging; If the output power is less than the actual required power, determining a second difference power between the output power and the actual required power; The low-voltage battery is controlled to provide a low-voltage power supply for the vehicle with the second differential power in cooperation with the low-voltage voltage converter. 3. The method according to claim 1, wherein, if the remaining power percentage and the battery health percentage of the low-voltage storage battery are not obtained, the voltage value in the low-voltage circuit of the vehicle is collected by the vehicle body controller; According to the voltage value, the output power of the low-voltage voltage converter is determined. 4. The method according to claim 3, wherein determining the output power of the low-voltage voltage converter according to the voltage value comprises: determining whether the voltage value is greater than a fourth threshold; If the voltage value is greater than the fourth threshold, determine that the low-voltage voltage converter does not output low-voltage power; If the voltage value is less than the fourth threshold, the output power of the low-voltage voltage converter is determined according to the actual power demand of the vehicle. 5. The method according to claim 1, further comprising: If the battery health percentage is less than the first threshold, display a prompt message for replacing the low-voltage battery and determine the output power of the low-voltage voltage converter according to the actual power demand of the vehicle. 6. A vehicle controller, characterized in that, comprising: An acquisition module, configured to acquire the percentage of remaining power and the percentage of battery health of the low-voltage storage battery; a processing module, configured to determine whether the battery health percentage is greater than a first threshold; The processing module is further configured to determine the output power of the low-voltage voltage converter according to the remaining power percentage if the battery health percentage is greater than a first threshold; A sending module, configured to send a control instruction to the low-voltage voltage converter according to the determined output power, so that the low-voltage voltage converter provides a low-voltage power supply to the low-voltage storage battery with the output power; Wherein, the processing module is specifically used for: determining whether the remaining power percentage is greater than a second threshold; If the remaining power percentage is greater than the second threshold, determine that the low-voltage converter does not output low-voltage power; If the remaining power percentage is less than or equal to the second threshold and greater than a third threshold, then determine the output power of the low-voltage voltage converter according to the power conversion efficiency characteristics of the low-voltage voltage converter; If the remaining power percentage is less than or equal to the third threshold, the output power of the low-voltage voltage converter is determined according to the actual power demand of the vehicle. 7. The vehicle controller according to claim 6, characterized in that it comprises: at least one processor; and at least one memory communicatively coupled to the processor, wherein: The memory stores program instructions executable by the processor, and the processor invokes the program instructions to execute the method as claimed in any one of claims 1 to 5 . 8. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions cause the computer to execute the method according to any one of claims 1 to 5.

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