Control method, device, storage medium and processor of power management system

Abstract

The present invention discloses a control method, device, storage medium and processor of a power management system. The method comprises: receiving a power-off instruction of a target vehicle, wherein the power-off instruction is used to control the power management system to perform a preset power-off operation, and the preset power-off operation comprises at least one of the following: cutting off the connection between the original low-voltage battery and the low-voltage accessory system, and cutting off the connection between the backup low-voltage battery and the low-voltage accessory system; obtaining the ambient temperature of the target vehicle, the power of the original low-voltage battery and the power of the backup low-voltage battery; in response to the ambient temperature meeting a preset condition, generating a control instruction set, and the control instruction set is used to control the power management system to perform a power replenishment strategy, wherein the power replenishment strategy comprises at least one of the following: replenishing power for the backup low-voltage battery, and replenishing power for the original low-voltage battery. The present invention solves the technical problem of low-voltage battery feeding.

Description

Technical Field

[0001] The present invention relates to the field of electric vehicles, and in particular to a control method, device, storage medium and processor of a power management system. Background Art

[0002] The low-voltage battery of pure electric vehicles will occasionally experience power feeding, which will cause the controller to fail to work and the vehicle to fail to start, resulting in major user complaints. There are three main reasons for the power feeding of low-voltage batteries: First, unlike traditional fuel vehicles, pure electric vehicles are more powerful and intelligent, with a large number of low-voltage controllers and sensors on the vehicle, and the low-voltage load power consumption is large. The static current is large after the vehicle network is dormant, and the low-voltage battery has limited energy. After the vehicle is turned off and powered off for a long time, the battery power is gradually exhausted, resulting in power feeding; second, the vehicle network fails. After the user stops and powers off, the CAN network does not sleep normally, and many controllers are still in the awake state, with high power and high power consumption, causing the low-voltage battery power to be quickly exhausted, resulting in power feeding; third, some users use the vehicle improperly, such as not closing the door for a long time or frequently starting and shutting down the vehicle, causing the vehicle to not sleep for a long time, and many controllers are still in the awake state, with high power and high power consumption, causing the low-voltage battery power to be quickly exhausted, resulting in power feeding.

[0003] In order to solve the problem of low-voltage battery feeding, the usual practice is to configure a battery with a larger capacity, and some even use two low-voltage batteries, but this cannot fundamentally eliminate the feeding problem. Summary of the invention

[0004] The embodiments of the present invention provide a control method, device, storage medium and processor of a power management system, so as to at least solve the technical problem of low-voltage battery power feeding.

[0005] According to one aspect of an embodiment of the present invention, a control method for a power management system is provided, comprising: receiving a power-off instruction of a target vehicle, wherein the power-off instruction is used to control the power management system to perform a preset power-off operation, the preset power-off operation comprising at least one of the following: disconnecting an original low-voltage battery from a low-voltage accessory system, disconnecting a backup low-voltage battery from a low-voltage accessory system; obtaining the ambient temperature of the target vehicle, the power level of the original low-voltage battery, and the power level of the backup low-voltage battery; in response to the ambient temperature satisfying a preset condition, generating a control instruction set, the control instruction set being used to control the power management system to execute a power replenishment strategy, wherein the power replenishment strategy comprises at least one of the following: replenishing power for the backup low-voltage battery, and replenishing power for the original low-voltage battery.

[0006] Optionally, in response to the ambient temperature satisfying a preset condition, a control instruction set is generated, and the control instruction set is used to control the power management system to execute a power replenishment strategy, including: when the ambient temperature satisfies a first preset condition, determining whether the power consumption of the original low-voltage battery is greater than a first power threshold; if so, generating a first target instruction in the control instruction set, and the first target instruction is used to control the power management system to replenish power for the backup low-voltage battery; after the backup low-voltage battery is fully charged, controlling the power management system to execute a preset power-off operation.

[0007] Optionally, the control method further includes: when it is determined that the power consumption of the original low-voltage battery is greater than a first power threshold, controlling the power management system to record a fault code of the original low-voltage battery.

[0008] Optionally, in response to the ambient temperature satisfying a preset condition, a control instruction set is generated, and the control instruction set is used to control the power management system to execute a power replenishment strategy, including: when the ambient temperature satisfies a second preset condition, determining whether the power consumption of the original low-voltage battery is greater than a second power threshold; if not, determining whether the power consumption of the original low-voltage battery is greater than a third power threshold; if yes, generating a second target instruction in the control instruction set, and the second target instruction is used to control the power management system to replenish power for the original low-voltage battery; after the original low-voltage battery is fully charged, controlling the power management system to execute a preset power-off operation.

[0009] Optionally, in response to the ambient temperature meeting a preset condition, a control instruction set is generated, and the control instruction set is used to control the power management system to execute a power replenishment strategy, including: when the ambient temperature meets the preset condition, waking up the power management system to measure the power consumption of the original low-voltage battery.

[0010] Optionally, in response to the ambient temperature satisfying a preset condition, a control instruction set is generated, and the control instruction set is used to control the power management system to execute a power replenishment strategy, including: during the power replenishment process, adjusting the output voltage of the DCDC converter connected to the low-voltage battery to be charged based on the battery level of the low-voltage battery to be charged and the ambient temperature.

[0011] According to another aspect of an embodiment of the present invention, a control device of a power management system is also provided, including: a receiving module, the receiving module is used to receive a high-voltage power-off instruction of a target vehicle, wherein the power-off instruction is used to control the power management system to perform a preset power-off operation, and the preset power-off operation includes at least one of the following: cutting off the DCDC converter, cutting off the connection between the original low-voltage battery and the low-voltage accessory system, and cutting off the connection between the backup low-voltage battery and the low-voltage accessory system; an acquisition module, the acquisition module is used to obtain the ambient temperature of the target vehicle and the power level of the original low-voltage battery; a control module, the control module is used to generate a control instruction set in response to the ambient temperature satisfying a preset condition, and the control instruction set is used to control the power management system to execute a power replenishment strategy, wherein the power replenishment strategy includes at least one of the following: replenishing power for the backup low-voltage battery and replenishing power for the original low-voltage battery.

[0012] According to another aspect of an embodiment of the present invention, a computer storage medium is provided, the computer storage medium including a stored program, wherein when the program is running, the device where the computer storage medium is located is controlled to execute any one of the control methods in the above schemes.

[0013] According to another aspect of an embodiment of the present invention, a processor is further provided. The processor is used to run a program. The processor is configured to run a computer program to execute any one of the control methods in the above solutions.

[0014] According to another aspect of an embodiment of the present invention, there is also provided an electronic device, comprising a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute any one of the control methods in the above schemes.

[0015] In the embodiment of the present invention, when there is no need to use the vehicle, according to the power-off instruction, the connection between the low-voltage battery and the low-voltage accessory system is cut off, the extra power consumption of the low-voltage accessory system is reduced, and the low-voltage battery is prevented from feeding. After the vehicle is powered off, the low-voltage battery is replenished in stages according to the power consumption of the low-voltage battery to prevent the next power-on from being unable to be performed due to the feeding of the low-voltage battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 is a structural block diagram of an optional control method of a power management system according to an embodiment of the present invention applied to an electronic device of a vehicle;

[0018] Figure 2is a flow chart of an optional control method of a power management system according to an embodiment of the present invention;

[0019] Figure 3 is a schematic diagram of a circuit of an optional power management system according to an embodiment of the present invention;

[0020] Figure 4 is a schematic diagram of a signal circuit of an optional power management system according to an embodiment of the present invention;

[0021] Figure 5 is a flow chart of an optional control method of a power management system according to an embodiment of the present invention;

[0022] Figure 6 is a flow chart of an optional control method of a power management system according to an embodiment of the present invention;

[0023] Figure 7 It is a structural block diagram of a control device of an optional power management system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] According to an embodiment of the present invention, a method embodiment of a control method for a power management system is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0027] The method embodiment can be executed in an electronic device or similar computing device in a vehicle including a memory and a processor. For example, Figure 1 As shown, the electronic device of the vehicle may include one or more processors 102 (the processor may include but is not limited to a central processing unit (CPU), a graphics processing unit (GPU), a digital signal processing (DSP) chip, a microprocessor (MCU), a field programmable logic device (FPGA), a neural network processor (NPU), a tensor processing unit (TPU), an artificial intelligence (AI) type processor, etc.) and a memory 104 for storing data. Optionally, the electronic device of the above-mentioned car may also include a transmission device 106 for communication functions, an input and output device 108, and a display device 110. It can be understood by those skilled in the art that Figure 1 The structure shown is for illustration only and does not limit the structure of the electronic device of the vehicle. For example, the electronic device of the vehicle may include more or fewer components than those described in the above structure, or may have a configuration different from that described in the above structure.

[0028] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the control method of the power management system in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, to realize the control method of the above-mentioned hydrogen direct injection system. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0029] The transmission device 106 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device can be a radio frequency (Radio Frequency, referred to as RF) module, which is used to communicate with the Internet wirelessly.

[0030] The display device 110 may be, for example, a touch screen type liquid crystal display (LCD) and a touch display (also referred to as a "touch screen" or a "touch display screen"). The liquid crystal display may enable a user to interact with a user interface of the mobile terminal. In some embodiments, the mobile terminal has a graphical user interface (GUI), and a user may interact with the GUI by finger contact and / or gestures on a touch-sensitive surface, wherein the human-computer interaction functions here may optionally include the following interactions: creating web pages, drawing, word processing, making electronic documents, games, video conferencing, instant messaging, sending and receiving emails, call interfaces, playing digital videos, playing digital music and / or web browsing, etc. The executable instructions for executing the above human-computer interaction functions are configured / stored in a computer program product or a readable storage medium executable by one or more processors.

[0031] This embodiment provides a control method running on the above power management system. Figure 2 is a flow chart of a control method of a power management system according to one embodiment of the present invention. Figure 2 As shown, the process includes the following steps: Step S1: Receive a power-off instruction of the target vehicle, wherein the power-off instruction is used to control the power management system to perform a preset power-off operation, and the preset power-off operation includes at least one of the following: cutting off the connection between the original low-voltage battery and the low-voltage accessory system, and cutting off the connection between the backup low-voltage battery and the low-voltage accessory system. Step S2: Obtain the ambient temperature of the target vehicle, the power of the original low-voltage battery, and the power of the backup low-voltage battery. Step S3: In response to the ambient temperature meeting the preset conditions, generate a control instruction set, and the control instruction set is used to control the power management system to execute a power replenishment strategy, wherein the power replenishment strategy includes at least one of the following: replenishing power for the backup low-voltage battery, and replenishing power for the original low-voltage battery.

[0032] In the embodiment of the present application, when there is no need to use the vehicle, according to the power-off instruction, the connection between the low-voltage battery and the low-voltage accessory system is cut off, the extra power consumption of the low-voltage accessory system is reduced, and the low-voltage battery is prevented from feeding. After the vehicle is powered off, the low-voltage battery is replenished in stages according to the power consumption of the low-voltage battery to prevent the next power-on from being unable to be performed due to the feeding of the low-voltage battery.

[0033] Optionally, in step 3, in response to the ambient temperature satisfying a preset condition, a control instruction set is generated, and the control instruction set is used to control the power management system to execute a power replenishment strategy, including: when the ambient temperature satisfies the first preset condition, determining whether the power consumption of the original low-voltage battery is greater than the first power threshold; if so, generating a first target instruction in the control instruction set, and the first target instruction is used to control the power management system to replenish power for the backup low-voltage battery; after the backup low-voltage battery is fully charged, controlling the power management system to execute a preset power-off operation. Among them, the first preset condition is the duration of the ambient temperature within the preset temperature range, and different preset temperature ranges correspond to different durations.

[0034] In the above steps, when the ambient temperature is within a certain preset temperature range and lasts for more than the corresponding preset time, if the power consumption of the original low-voltage battery is greater than the first power threshold, it means that the original low-voltage battery has failed and the installed low-voltage battery cannot be used normally at the next power-on. The next time the power is turned on, a backup low-voltage battery is needed. The backup low-voltage battery is then recharged and fully charged to ensure normal power-on next time.

[0035] Optionally, in step 3, the control method further includes: when it is determined that the power consumption of the original low-voltage battery is greater than a first power threshold, controlling the power management system to record a fault code of the original low-voltage battery.

[0036] In the above steps, the power consumption of the original low-voltage battery is greater than the first power threshold, that is, the original low-voltage battery fails, and the power management system records the fault code of the original low-voltage battery to remind the user to perform timely maintenance to avoid affecting subsequent use.

[0037] Optionally, in step 3, in response to the ambient temperature satisfying a preset condition, a control instruction set is generated, and the control instruction set is used to control the power management system to execute a power replenishment strategy, including: when the ambient temperature satisfies the second preset condition, judging whether the power consumption of the original low-voltage battery is greater than the second power threshold; if not, judging whether the power consumption of the original low-voltage battery is greater than the third power threshold; if yes, generating a second target instruction in the control instruction set, and the second target instruction is used to control the power management system to replenish the original low-voltage battery; after the original low-voltage battery is fully charged, controlling the power management system to execute a preset power-off operation. Among them, the second preset condition is the duration of the ambient temperature within the preset temperature range, and different preset temperature ranges correspond to different durations.

[0038] In the above steps, if the power consumption of the original low-voltage battery is less than or equal to the second power threshold, it means that the original low-voltage battery has no faults and can be used normally. If the power consumption of the original low-voltage battery is greater than the third power threshold, it means that the remaining power of the original low-voltage battery is low, and in order to avoid power feeding, supplementary power is required.

[0039] Optionally, in step 3, in response to the ambient temperature meeting a preset condition, a control instruction set is generated, and the control instruction set is used to control the power management system to execute a power replenishment strategy, including: when the ambient temperature meets the preset condition, waking up the power management system to measure the power consumption of the original low-voltage battery.

[0040] In the above steps, the power management system is awakened to monitor the power supply only when the ambient temperature meets the preset conditions, so as to avoid unnecessary power loss caused by continuous monitoring of the power supply.

[0041] Optionally, in step 3, in response to the ambient temperature satisfying a preset condition, a control instruction set is generated, and the control instruction set is used to control the power management system to execute a power replenishment strategy, including: during the power replenishment process, based on the battery level of the low-voltage battery to be charged and the ambient temperature, adjusting the output voltage of the DCDC converter connected to the low-voltage battery to be charged.

[0042] In the above steps, during the charging process, the output voltage of the DCDC converter is adjusted according to the battery power of the low-voltage battery to be charged and the ambient temperature. For example, when the power of the low-voltage battery to be charged is high, the output voltage of the DCDC converter is appropriately reduced, thereby reducing the power consumption of the low-voltage accessories, reducing the power consumption of the vehicle, and saving charging energy.

[0043] The embodiment of the present application also provides a circuit diagram of a power management system, such as Figure 3As shown, it includes: high-voltage power battery, DCDC converter (hereinafter referred to as DCDC), first low-voltage battery, second low-voltage battery, on-board charger, switch S1, switch S2, DC charging pile, vehicle control unit (hereinafter referred to as VCU), low-voltage accessory system, battery management system (hereinafter referred to as BMS), motor system, high-voltage accessory system, etc. Among them, switch S1 is connected in series with the first low-voltage battery, the first low-voltage battery is used as a backup low-voltage battery, the second low-voltage battery is used as an original low-voltage battery, and switch S2 is connected in series with the low-voltage accessory system.

[0044] The embodiment of the present application also provides a signal circuit diagram of a power management system, such as Figure 4 As shown, it includes: VCU, DCDC, BMS, a first low-voltage battery power monitor, and a second low-voltage battery power monitor. The first low-voltage battery power monitor is used to monitor the state of charge (SOC1) of the first low-voltage battery and transmit this signal to the VCU. The second low-voltage battery power monitor is used to implement the monitoring of the state of charge (SOC2) of the second low-voltage battery and transmit this signal to the VCU. The BMS is used to monitor the state of charge (SOC3) and fault status of the high-voltage power battery in real time and transmit the relevant signal to the VCU. The BMS can also control the relay inside the high-voltage power battery to realize the power-on or power-off of the high-voltage power battery. The DCDC can transmit its own opening and closing state to the VCU, and can also accept the opening and closing command of the VCU to open or disconnect. When the DCDC is turned on, the power of the high-voltage power battery can be transmitted to the low-voltage battery and the low-voltage accessory system, VCU, etc. After the DCDC is turned off, the high-voltage power battery cannot supply power to the low-voltage battery, the low-voltage accessory system and the VCU. VCU can control the opening or closing of DCDC, and can also control DCDC to control the output voltage. It can send instructions to BMS to control the power on or off of the high-voltage power battery. It can comprehensively coordinate and control the sleep and wake-up of all controllers in the vehicle network. When a controller is in the awake state, it can work normally to send or receive related signals and perform calculations, and its power consumption is relatively high. When a controller is in the sleep state, its power consumption is relatively low, with only sleep static current. At the same time, it stops working and does not perform related calculations.

[0045] The embodiment of the present application also provides an optional power management system control method, according to Figure 3 , Figure 4 The specific system shown in the figure is used to specifically describe the control method. The vehicle state is divided into four working conditions, namely, the vehicle is started and is in a non-charging state (working condition 1), the vehicle is started and is in a charging state (working condition 2), the vehicle is turned off and is in a non-charging state (working condition 3), and the vehicle is turned off and is in a charging state (working condition 4). The specific explanations are shown in Table 1 below.

[0046] Table 1

[0047]

[0048] The control method corresponding to operating condition 1 is as follows:

[0049] As Figure 5 shown, the vehicle network is in the wake-up state, the VCU does not perform sleep control, the VCU controls the DCDC to be always in the on state, the voltage at the output end of the DCDC is controlled according to the ambient temperature and the state of charge of the second low-voltage battery, and the voltage at the output end of the DCDC is determined by looking up a table according to the SOC2 value of the second low-voltage battery. The voltage at the output end of the DCDC is shown in Table 2. Among them, the temperature T1 is preferably 0 °C, which is not the only value, only for example, the voltage U1 ranges from 14 < U1 < 16, preferably 14.5V, which is not the only value, only for example. The VCU controls the switch S2 to be in the closed state, and the switch S1 is default to be in the open state, and is controlled according to the state of charge of the first low-voltage battery and the fault state of the second low-voltage battery. When the second low-voltage battery has no fault and the SOC1 of the first low-voltage battery < SOC_y, the switch S1 is closed to charge the first low-voltage battery. When it is fully charged, the switch S1 is disconnected, and so on. When the second low-voltage battery fails, the switch S1 is closed. The SOC_y is related to the temperature and is determined by looking up a table according to the temperature, as shown in Table 3 specifically.

[0050] Under different temperatures and different battery states of charge, the output voltage of the DCDC is adjusted in real time. On the one hand, it can prevent the second low-voltage battery from discharging, effectively ensuring the life of the second low-voltage battery. On the other hand, when the state of charge of the second low-voltage battery is relatively high, the output voltage of the DCDC is appropriately reduced, thereby reducing the power consumption of the low-voltage accessories, reducing the vehicle's power consumption, and increasing the cruising range. On the other hand, by connecting to the first low-voltage battery through the switch S1, its state of charge is ensured to be in a high state of charge, and it can replace in time when the second low-voltage battery fails.

[0051] Table 2

[0052]

[0053] Table 3

[0054]

[0055]

[0056] The control method corresponding to operating condition 2 is as follows:

[0057] When the vehicle network is in the wake-up state, the VCU does not perform sleep control. The VCU controls the DCDC to be always in the on state. The voltage at the output end of the DCDC is controlled according to the ambient temperature and the state of charge of the second low-voltage battery. The voltage at the output end of the DCDC is determined by looking up a table based on the SOC2 of the second low-voltage battery. The voltage at the output end of the DCDC is shown in Table 4. Among them, the temperature T2 is preferably 0°C, not the only value, just for example. The voltage U2 ranges from 14.5 < U2 < 16, preferably 15V, not the only value, just for example. U2 > U1 (U1 corresponding to the above working condition 1). The VCU controls the switch S1 and the switch S2 to be in the normally closed state.

[0058] Under different temperatures and different battery SOCs, the output voltage of the DCDC is adjusted in real time. On the one hand, it can prevent the low-voltage battery from discharging, effectively ensuring the life of the low-voltage battery. On the other hand, when the low-voltage battery has a high state of charge, the output voltage of the DCDC is appropriately reduced, thereby reducing the power consumption of low-voltage accessories, reducing the vehicle's electrical consumption, and saving charging electrical energy.

[0059] Table 4

[0060]

[0061]

[0062] As Figure 6 shown, the control method corresponding to working condition 3 is as follows:

[0063] The VCU controls the DCDC to turn off and sends a command to the BMS to control the internal relay of the high-voltage power battery to disconnect, power off the high-voltage power battery, and the VCU comprehensively coordinates the vehicle network to go to sleep. The VCU controls the switch S1 to disconnect, the VCU controls the switch S2 to disconnect, and records the SOC2 of the second low-voltage battery and the ambient temperature Tx before going to sleep. Starting from when the vehicle network starts to sleep, when the ambient temperature Tx > T3 (T3 is preferably 0°C, not the only value, just for example), when the timing time exceeds a certain time t1 (preferably 3h, for example, not the only value), the VCU wakes up the DCDC, the first low-voltage battery power monitor, the second low-voltage battery power monitor, and the BMS. The VCU judges according to the SOC2 of the second low-voltage battery reported by the second low-voltage battery power monitor (assuming that the SOC2 at this time is SOCx):

[0064] If SOC2-SOCx>SOC_cal1 (SOC_cal1 constant value can be calibrated, preferably 5%, only for example, not a unique value), it is considered that the second low-voltage battery has an abnormal condition, VCU reports the second low-voltage battery fault, and records the fault code. The next time the driver turns on the start switch to start the vehicle, VCU sends this fault to the instrument for prompting. VCU controls switch S1 to close, and at the same time VCU sends a command to BMS to start the internal relay of the high-voltage power battery to power on the high voltage, and VCU controls DCDC to turn on, the output voltage is 16V, the high-voltage power battery charges the first low-voltage battery and the second low-voltage battery. When the first low-voltage battery is full, VCU starts to control DCDC to close, and sends a command to BMS to control the internal relay of the high-voltage power battery to disconnect, and power off the high-voltage power battery. VCU comprehensively coordinates BMS, DCDC, the first low-voltage battery power monitor, and the second low-voltage battery power monitor to sleep, and counts before sleeping, and repeats the above operation.

[0065] If SOC2-SOCx≤SOC_cal1 (the SOC_cal1 constant value can be calibrated, preferably 5%, which is only an example and not a unique value), it is considered that there is no abnormality in the second low-voltage battery system, and the switch S1 remains disconnected.

[0066] If SOC_cal2<SOC2-SOCx≤SOC_cal1, the VCU sends a command to the BMS to start the internal relay of the high-voltage power battery to power on the high voltage. The VCU controls the DCDC to turn on, and the output voltage is 16V. The high-voltage power battery charges the second low-voltage battery. When the battery is fully charged, the VCU starts to control the DCDC to turn off, and sends a command to the BMS to control the internal relay of the high-voltage power battery to disconnect and power off the high-voltage power battery. The VCU comprehensively coordinates the BMS, DCDC, the first low-voltage battery power monitor and the second low-voltage battery power monitor to sleep, and counts before sleeping, and repeats the above operations.

[0067] If SOC2-SOCx≤SOC_cal2 (SOC_cal2 constant value can be calibrated, preferably 1%, which is just an example and not a unique value), the VCU comprehensively coordinates the BMS, DCDC, the first low-voltage battery power monitor and the second low-voltage battery power monitor to sleep, and performs timing before sleep, and repeats the above operation.

[0068] The control method corresponding to working condition 4 is as follows:

[0069] The VCU controls the DCDC, the first low-voltage battery power monitor, the second low-voltage battery power monitor, and the BMS to be always in the wake-up state. Other controllers of the low-voltage system go into sleep mode, and switches S1 and S2 are disconnected. The VCU controls the DCDC to be always in the on state. The voltage at the output end of the DCDC is controlled according to the ambient temperature and the state of charge of the second low-voltage battery. The voltage at the output end of the DCDC is determined by looking up a table based on the SOC2 of the second low-voltage battery. The voltage at the output end of the DCDC is shown in Table 5. Among them, the temperature T4 is preferably 0°C, which is not the only value, just for example. The voltage U3 ranges from 14.5 < U3 < 16, preferably 15V, which is not the only value, just for example. U3 > U1 (U1 corresponding to the above working condition 1).

[0070] Under different temperatures and different battery SOCs, the output voltage of the DCDC is adjusted in real time. On the one hand, it can prevent the low-voltage battery from discharging, effectively ensuring the life of the low-voltage battery. On the other hand, when the low-voltage battery has a high power level, the output voltage of the DCDC is appropriately reduced, thereby reducing the power consumption of low-voltage accessories, reducing the overall vehicle power consumption, and saving charging electric energy.

[0071] Table 5

[0072]

[0073] An embodiment of the present application further provides a control device for a power management system. Figure 7 It is a structural block diagram of the control device for the power management system, as Figure 7 shown. The device includes: a receiving module 51, an obtaining module 52, and a control module 53. The receiving module 51 is used to receive the power-off instruction of the target vehicle. Among them, the power-off instruction is used to control the power management system to perform a preset power-off operation. The preset power-off operation includes at least one of the following: cutting off the connection between the original low-voltage battery and the low-voltage accessory system, cutting off the connection between the backup low-voltage battery and the low-voltage accessory system. The obtaining module 52 is used to obtain the ambient temperature of the target vehicle, the power level of the original low-voltage battery, and the power level of the backup low-voltage battery. The control module 53 is used to generate a control instruction set in response to the ambient temperature meeting a preset condition. The control instruction set is used to control the power management system to execute a charging strategy. Among them, the charging strategy includes at least one of the following: charging the backup low-voltage battery, charging the original low-voltage battery.

[0074] The embodiment of the present application also provides a storage medium, in which a computer program is stored, wherein the computer program is configured to execute the steps in any of the above method embodiments when running. Optionally, in this embodiment, the above storage medium can be configured to store a computer program for executing the following steps: Step S1: Receive a power-off instruction of the target vehicle, wherein the power-off instruction is used to control the power management system to perform a preset power-off operation, and the preset power-off operation includes at least one of the following: cutting off the connection between the original low-voltage battery and the low-voltage accessory system, and cutting off the connection between the backup low-voltage battery and the low-voltage accessory system. Step S2: Obtain the ambient temperature of the target vehicle, the power of the original low-voltage battery, and the power of the backup low-voltage battery. Step S3: In response to the ambient temperature meeting the preset condition, generate a control instruction set, and the control instruction set is used to control the power management system to execute a power replenishment strategy, wherein the power replenishment strategy includes at least one of the following: replenishing power for the backup low-voltage battery and replenishing power for the original low-voltage battery.

[0075] The embodiment of the present application also provides a processor, which is configured to run a computer program to execute the steps in any of the above method embodiments. Optionally, in this embodiment, the above processor can be configured to execute the following steps through a computer program: Step S1: Receive a power-off instruction of the target vehicle, wherein the power-off instruction is used to control the power management system to perform a preset power-off operation, and the preset power-off operation includes at least one of the following: cutting off the connection between the original low-voltage battery and the low-voltage accessory system, and cutting off the connection between the backup low-voltage battery and the low-voltage accessory system. Step S2: Obtain the ambient temperature of the target vehicle, the power of the original low-voltage battery, and the power of the backup low-voltage battery. Step S3: In response to the ambient temperature meeting the preset conditions, generate a control instruction set, and the control instruction set is used to control the power management system to execute a power replenishment strategy, wherein the power replenishment strategy includes at least one of the following: replenishing power for the backup low-voltage battery and replenishing power for the original low-voltage battery.

[0076] The embodiment of the present application also provides an electronic device, including a memory and a processor, characterized in that a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any of the above method embodiments. Optionally, in this embodiment, the above processor can be configured to execute the following steps through a computer program: Step S1: Receive a power-off instruction of the target vehicle, wherein the power-off instruction is used to control the power management system to perform a preset power-off operation, and the preset power-off operation includes at least one of the following: cutting off the connection between the original low-voltage battery and the low-voltage accessory system, and cutting off the connection between the backup low-voltage battery and the low-voltage accessory system. Step S2: Obtain the ambient temperature of the target vehicle, the power of the original low-voltage battery, and the power of the backup low-voltage battery. Step S3: In response to the ambient temperature meeting the preset condition, generate a control instruction set, and the control instruction set is used to control the power management system to execute a power replenishment strategy, wherein the power replenishment strategy includes at least one of the following: replenishing power for the backup low-voltage battery and replenishing power for the original low-voltage battery.

[0077] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0078] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0079] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0080] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0081] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0082] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0083] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A control method for a power management system, characterized in that: include: Receiving a power-off instruction of a target vehicle, wherein the power-off instruction is used to control the power management system to perform a preset power-off operation, wherein the preset power-off operation includes at least one of the following: disconnecting an original low-voltage battery from a low-voltage accessory system, disconnecting a backup low-voltage battery from a low-voltage accessory system; Obtaining the ambient temperature of the target vehicle, the power level of the original low-voltage battery, and the power level of the backup low-voltage battery; In response to the ambient temperature meeting a preset condition, a control instruction set is generated, wherein the control instruction set is used to control the power management system to execute a power replenishment strategy, wherein the power replenishment strategy includes at least one of the following: replenishing power for the backup low-voltage battery, replenishing power for the original low-voltage battery; In response to the ambient temperature satisfying a preset condition, a control instruction set is generated, wherein the control instruction set is used to control the power management system to execute a power replenishment strategy, including: When the ambient temperature satisfies a first preset condition, determining whether the power consumption of the original low-voltage battery is greater than a first power threshold; If yes, generate a first target instruction in the control instruction set, wherein the first target instruction is used to control the power management system to supplement power for the backup low-voltage battery; After the backup low-voltage battery is fully charged, controlling the power management system to perform a preset power-off operation; When it is determined that the power consumption of the original low-voltage battery is greater than the first power threshold, controlling the power management system to record a fault code of the original low-voltage battery; When the ambient temperature satisfies a second preset condition, determining whether the power consumption of the original low-voltage battery is greater than a second power threshold; If not, determining whether the power consumption of the original low-voltage battery is greater than a third power threshold; If yes, generate a second target instruction in the control instruction set, where the second target instruction is used to control the power management system to recharge the original low-voltage battery; After the original low-voltage battery is fully charged, controlling the power management system to perform a preset power-off operation; The preset condition is the duration of time that the ambient temperature is within the preset temperature range, and different preset temperature ranges correspond to different durations.

2. The control method according to claim 1, characterized in that: In response to the ambient temperature satisfying a preset condition, a control instruction set is generated, wherein the control instruction set is used to control the power management system to execute a power replenishment strategy, including: When the ambient temperature meets a preset condition, the power management system is awakened to measure the power consumption of the original low-voltage battery.

3. The control method according to claim 1, characterized in that: In response to the ambient temperature satisfying a preset condition, a control instruction set is generated, wherein the control instruction set is used to control the power management system to execute a power replenishment strategy, including: During the charging process, the output voltage of the DCDC converter connected to the low-voltage battery to be charged is adjusted based on the battery power of the low-voltage battery to be charged and the ambient temperature.

4. A control device for a power management system, characterized in that: include: A receiving module, the receiving module is used to receive a power-off instruction of a target vehicle, wherein the power-off instruction is used to control the power management system to perform a preset power-off operation, and the preset power-off operation includes at least one of the following: disconnecting a DCDC converter, disconnecting an original low-voltage battery from a low-voltage accessory system, and disconnecting a backup low-voltage battery from a low-voltage accessory system; An acquisition module, the acquisition module is used to acquire the ambient temperature of the target vehicle and the power level of the original low-voltage battery; A control module, wherein the control module is used to generate a control instruction set in response to the ambient temperature meeting a preset condition, wherein the control instruction set is used to control the power management system to execute a power replenishment strategy, wherein the power replenishment strategy includes at least one of the following: replenishing power for the backup low-voltage battery, replenishing power for the original low-voltage battery; In response to the ambient temperature satisfying a preset condition, a control instruction set is generated, wherein the control instruction set is used to control the power management system to execute a power replenishment strategy, including: When the ambient temperature satisfies a first preset condition, determining whether the power consumption of the original low-voltage battery is greater than a first power threshold; If yes, generate a first target instruction in the control instruction set, wherein the first target instruction is used to control the power management system to supplement power for the backup low-voltage battery; After the backup low-voltage battery is fully charged, controlling the power management system to perform a preset power-off operation; When it is determined that the power consumption of the original low-voltage battery is greater than the first power threshold, controlling the power management system to record a fault code of the original low-voltage battery; When the ambient temperature satisfies a second preset condition, determining whether the power consumption of the original low-voltage battery is greater than a second power threshold; If not, determining whether the power consumption of the original low-voltage battery is greater than a third power threshold; If yes, generate a second target instruction in the control instruction set, where the second target instruction is used to control the power management system to recharge the original low-voltage battery; After the original low-voltage battery is fully charged, controlling the power management system to perform a preset power-off operation; The preset condition is the duration of time that the ambient temperature is within the preset temperature range, and different preset temperature ranges correspond to different durations.

5. A computer storage medium, characterized in that: The computer storage medium includes a stored program, wherein when the program is executed, the device where the computer storage medium is located is controlled to execute the control method according to any one of claims 1 to 3.

6. A processor, characterized in that: The processor is used to run a program, and the processor is configured to run a computer program to execute the control method according to any one of claims 1 to 3.

7. An electronic device comprising a memory and a processor, characterized in that: A computer program is stored in the memory, and the processor is configured to run the computer program to execute the control method according to any one of claims 1 to 3.

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