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 includes: 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 includes at least one of the following: controlling the first DCDC converter to be turned off, controlling the second DCDC converter to be turned off; obtaining the ambient temperature of the target vehicle and the power consumption of the low-voltage battery, and there are at least two low-voltage batteries, and at least two low-voltage batteries are arranged in parallel; detecting the first operating condition information of the low-voltage battery before the power-off, and the first operating condition information includes at least one of the following: non-fault state, fault state; based on the ambient temperature and the first operating condition information of the low-voltage battery, generating a power replenishment instruction, and the power replenishment instruction is used to control the power management system to replenish the 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, and the preset power-off operation includes at least one of the following: controlling the first DCDC converter to turn off, controlling the second DCDC converter to turn off; obtaining the ambient temperature of the target vehicle and the power consumption of a low-voltage battery, wherein there are at least two low-voltage batteries, and at least two low-voltage batteries are arranged in parallel; detecting first operating condition information of the low-voltage battery before the power-off, wherein the first operating condition information includes at least one of the following: a non-fault state, a fault state; generating a recharging instruction based on the ambient temperature and the first operating condition information of the low-voltage battery, wherein the recharging instruction is used to control the power management system to recharge the low-voltage battery.

[0006] Optionally, based on the ambient temperature and the first operating condition information of the low-voltage battery, a recharging instruction is generated, including: when the ambient temperature meets the first preset condition and all the low-voltage batteries are in a non-fault state before the power-off, judging whether the average power consumption of all the low-voltage batteries is greater than a first power threshold; if so, detecting the current second operating condition information of all the low-voltage batteries, the second operating condition information including at least one of the following: non-fault state, fault state; based on the second operating condition information, the recharging instruction controls the power management system to recharge the low-voltage battery that is currently in a non-fault state; after the low-voltage battery that is currently in a non-fault state is fully charged, controls the power management system to perform a preset power-off operation.

[0007] Optionally, based on the ambient temperature and the first operating condition information of the low-voltage battery, a recharging instruction is generated, including: when the ambient temperature meets the second preset condition and only the first low-voltage battery is in a non-fault state before the power-off, judging whether the power consumption of the first low-voltage battery is greater than a second power threshold; if not, judging whether the power consumption of the first low-voltage battery is greater than a third power threshold; if yes, the recharging instruction is used to control the power management system to recharge the first low-voltage battery; after the first low-voltage battery is fully charged, controlling the power management system to perform a preset power-off operation.

[0008] Optionally, based on the ambient temperature and the first operating condition information of the low-voltage battery, a recharging instruction is generated, including: when the ambient temperature meets the third preset condition and only the second low-voltage battery is in a non-fault state before this power-off, determining whether the power consumption of the second low-voltage battery is greater than a fourth power threshold; if so, the power management system controls the high-voltage power battery to continue to remain in the power-off state.

[0009] Optionally, based on the ambient temperature and the first operating condition information of the low-voltage battery, a power replenishment instruction is generated, including: when the ambient temperature meets a preset condition, waking up the monitoring system of the power management system to measure the power consumption of the low-voltage battery.

[0010] Optionally, a charging instruction is generated based on the ambient temperature and the first operating condition information of the low-voltage battery, including: during the charging process, adjusting the output voltage of the DCDC converter connected to the low-voltage battery to be charged based on the battery power of the low-voltage battery to be charged and the ambient temperature.

[0011] Optionally, a power-off command of the target vehicle is received, wherein the power-off command is used to control the power management system to perform a preset power-off operation, including: before the power-off, obtaining the fault conditions of the first DCDC converter and the second DCDC converter; when the power management system executes the recharging command, only turning on the DCDC converter without faults.

[0012] According to one aspect of an embodiment of the present invention, a control device of a power management system is provided, comprising: 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: controlling the first DCDC converter to be turned off, controlling the second DCDC converter to be turned off; an acquisition module, the acquisition module is used to obtain the ambient temperature of the target vehicle and the power consumption of a low-voltage battery, wherein there are at least two low-voltage batteries, and at least two low-voltage batteries are arranged in parallel; a detection module, the detection module is used to detect first operating condition information of the low-voltage battery before the power is turned off, wherein the first operating condition information includes at least one of the following: a non-fault state and a fault state; a control module, the control module generates a recharging instruction based on the ambient temperature and the first operating condition information of the low-voltage battery, wherein the recharging instruction is to recharge the low-voltage battery.

[0013] According to one 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, a device where the computer storage medium is located is controlled to execute any one of the methods in the above schemes.

[0014] According to one aspect of an embodiment of the present invention, a processor is provided. The processor is used to run a program. The processor is configured to run a computer program to execute any one of the methods in the above solutions.

[0015] In the embodiment of the present invention, 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 impossible due to the power supply of the low-voltage battery. The fault condition of the DCDC converter of the vehicle before the power-off and the fault condition of the low-voltage battery are judged to avoid the re-activation of the faulty device. 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 2 is 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, an 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 1As 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: controlling the first DCDC converter to turn off, and controlling the second DCDC converter to turn off. Step S2: Obtain the ambient temperature of the target vehicle and the power consumption of the low-voltage battery, wherein there are at least two low-voltage batteries, and at least two low-voltage batteries are arranged in parallel. Step S3: Detect the first operating condition information of the low-voltage battery before the power-off, wherein the first operating condition information includes at least one of the following: non-fault state, fault state. Step S4: Generate a recharging instruction based on the ambient temperature and the first operating condition information of the low-voltage battery, wherein the recharging instruction is used to control the power management system to recharge the low-voltage battery.

[0032] In the embodiment of the present application, 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 impossible due to the power supply of the low-voltage battery. The fault condition of the DCDC converter of the vehicle before the power-off and the fault condition of the low-voltage battery are judged to avoid the re-activation of the faulty device.

[0033] Optionally, in step S4, based on the ambient temperature and the first operating condition information of the low-voltage battery, a recharging instruction is generated, including: when the ambient temperature meets the first preset condition and all the low-voltage batteries are in a non-fault state before the power-off, determine whether the average power consumption of all the low-voltage batteries is greater than the first power threshold. If so, detect the current second operating condition information of all the low-voltage batteries, and the second operating condition information includes at least one of the following: non-fault state, fault state. Based on the second operating condition information, the recharging instruction controls the power management system to recharge the low-voltage battery that is currently in a non-fault state. After the low-voltage battery that is currently in a non-fault state is fully charged, the power management system is controlled to perform 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 preset temperature range and the duration exceeds the corresponding preset duration, and when the average power consumption of all low-voltage batteries is greater than the first power threshold, it indicates that at least one low-voltage battery is faulty. Perform a secondary test on all low-voltage batteries to find the currently faulty low-voltage battery, and recharge the non-faulty low-voltage batteries to ensure normal power-on next time.

[0035] Optionally, in step S4, based on the ambient temperature and the first operating condition information of the low-voltage battery, a recharging instruction is generated, including: when the ambient temperature meets the second preset condition and only the first low-voltage battery is in a non-fault state before the power-off, judging whether the power consumption of the first low-voltage battery is greater than the second power threshold. If not, judging whether the power consumption of the first low-voltage battery is greater than the third power threshold. If yes, the recharging instruction is used to control the power management system to recharge the first low-voltage battery. After the first low-voltage battery is fully charged, the power management system is controlled to perform 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.

[0036] In the above steps, if the power consumption of the first low-voltage battery is less than or equal to the second power threshold, it means that the first low-voltage battery has no faults and can be used normally. If the power consumption of the first low-voltage battery is greater than the third power threshold, it means that the remaining power of the first low-voltage battery is low, and in order to avoid power feeding, supplementary power is required.

[0037] Optionally, in step S4, based on the ambient temperature and the first operating condition information of the low-voltage battery, a power replenishment instruction is generated, including: when the ambient temperature meets the third preset condition and only the second low-voltage battery is in a non-fault state before the power-off, judging whether the power consumption of the second low-voltage battery is greater than the fourth power threshold. If so, the power management system controls the high-voltage power battery to continue to remain in the power-off state. Among them, the third 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 second low-voltage battery is greater than the second power threshold, it means that the second low-voltage battery is faulty. When the second low-voltage battery fails, that is, all low-voltage batteries are in a faulty state, the high-voltage power battery cannot be powered on normally, that is, it continues to remain in a power-off state and wait for maintenance.

[0039] Optionally, in step S4, a power replenishment instruction is generated based on the ambient temperature and the first operating condition information of the low-voltage battery, including: based on the ambient temperature and the first operating condition information of the low-voltage battery, a power replenishment instruction is generated, including: when the ambient temperature meets the preset conditions, waking up the monitoring system of the power management system to measure the power consumption of the 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 S4, a charging instruction is generated based on the ambient temperature and the first operating condition information of the low-voltage battery, including: during the charging process, adjusting the output voltage of the DCDC converter connected to the low-voltage battery to be charged based on the battery power of the low-voltage battery to be charged and the ambient temperature.

[0042] In the above steps, 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 battery 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 entire vehicle, and saving charging energy.

[0043] Optionally, in step 1, a power-off instruction of the target vehicle is received, wherein the power-off instruction is used to control the power management system to perform a preset power-off operation, including: before the power-off, obtaining the fault conditions of the first DCDC converter and the second DCDC converter. When the power management system executes the power-on instruction, only the DCDC converter without fault is turned on.

[0044] In the above steps, a first DCDC converter and a second DCDC converter are set, and when one of them fails, the other can serve as a backup DCDC converter to ensure that the high-voltage power battery is powered on normally.

[0045] The embodiment of the present application also provides a circuit diagram of a power management system, such as Figure 3 As shown, it includes: high-voltage power battery, first DCDC converter (hereinafter referred to as DCDC1), first DCDC converter (hereinafter referred to as DCDC2), first low-voltage battery, second low-voltage battery, on-board charger, 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, the first low-voltage battery and the second low-voltage battery are arranged in parallel, both of which provide power for the low-voltage accessory system.

[0046] 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, DCDC1, DCDC2, 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. DCDC1 and DCDC2 can transmit their own opening and closing states to the VCU, and can also accept the opening and closing commands of the VCU to open or disconnect. When DCDC1 or DCDC2 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 DCDC1 and DCDC2 are 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 DCDC1 and DCDC2, and can also control DCDC1 and DCDC2 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, and it stops working and does not perform related calculations.

[0047] The embodiment of the present application also provides an optional power management system control method, according to Figure 3 , Figure 4 For the specific system shown, the control method will be described in detail. The vehicle states are divided into four working conditions, namely, the vehicle is started and in a non-charging state (working condition 1), the vehicle is started and in a charging state (working condition 2), the vehicle is turned off and in a non-charging state (working condition 3), and the vehicle is turned off and in a charging state (working condition 4). The specific explanations are shown in Table 1 below.

[0048] Table 1

[0049]

[0050] The control method corresponding to working condition 1 is as follows:

[0051] The vehicle network is in the wake-up state, and the VCU does not perform sleep control. Control the states of DCDC1 and DCDC2 as shown in Table 2. Control the output voltages of DCDC1 and DCDC2 as shown in Table 3. Among them, the temperature T1 is preferably 0°C, not the only value, only for example, and the voltage U1 ranges from 14 < U1 < 16, preferably 14.5V, not the only value, only for example.

[0052] Under different temperatures and different battery SOCs, adjust the output voltage of the DCDC 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, appropriately reduce the output voltage of the DCDC, thereby reducing the power consumption of low-voltage accessories, reducing the overall vehicle power consumption, and increasing the driving range.

[0053] Table 2

[0054]

[0055]

[0056] Table 3

[0057]

[0058] The control method corresponding to working condition 2 is as follows:

[0059] The vehicle network is in the wake-up state, the VCU does not perform sleep control, and control the states of DCDC1 and DCDC2 as shown in Table 4. Control the output voltages of DCDC1 and DCDC2 as shown in Table 5. Among them, the temperature T2 is preferably 0°C, not the only value, only for example, the voltage U2 ranges from 14.5 < U2 < 16, preferably 15V, not the only value, only for example, and U2 > U1 (U1 corresponding to the above working condition 1).

[0060] At different temperatures and different battery SOCs, the output voltage of DCDC is adjusted in real time. On the one hand, it can prevent the low-voltage battery from feeding and effectively ensure the life of the low-voltage battery. On the other hand, when the low-voltage battery is in a high power state, the output voltage of DCDC is appropriately reduced, thereby reducing the power consumption of low-voltage accessories, reducing the power consumption of the entire vehicle, and saving charging energy.

[0061] Table 4

[0062]

[0063] Table 5

[0064]

[0065] like Figure 5 As shown, the control method corresponding to working condition 3 is as follows:

[0066] VCU controls DCDC1 and DCDC2 to turn off, 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 the entire vehicle network to go into sleep mode, and records the SOC (herein referred to as SOC4) and ambient temperature Tx of the first low-voltage battery and the second low-voltage battery before sleep mode, and then starts sleep mode from the beginning of the vehicle network for timing. When the ambient temperature Tx>T3 (T3 is preferably 0°C, a non-unique value, just for example), the timing time exceeds a certain time t1 (preferably 3h, for example, a non-unique value), VCU wakes up DCDC, the first low-voltage battery power monitor, the second low-voltage battery power monitor and BMS.

[0067] VCU controls the opening and closing of DCDC according to the status of the two DCDCs, and makes judgments according to the status of the two low-voltage batteries and the SOC of the two low-voltage batteries (the SOC at this time is referred to as SOCx). If both low-voltage batteries are not faulty, SOC4 refers to the average SOC of the two batteries before sleep, and SOCx refers to the average SOC of the two batteries after waking up after a period of time. If one of the two low-voltage batteries is faulty, SOC4 refers to the SOC of the battery without fault (before sleep), and SOCx refers to the SOC of the battery without fault (after waking up after a period of time).

[0068] If SOC4-SOCx>SOC_cal1 (SOC_cal1 constant value can be calibrated, preferably 5%, just for example, not a unique value), it is considered that the low-voltage power consumption of the whole vehicle is abnormal, and the VCU reports the abnormal low-voltage power consumption fault and records the fault code. The next time the driver turns on the start switch to start the vehicle, the VCU sends this fault to the instrument for prompting. At the same time, 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 high-voltage power battery charges the low-voltage battery (the one or two without faults). When it is full, the VCU starts to control DCDC1 and DCDC2 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, DCDC1, DCDC2, 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.

[0069] If SOC4-SOCx≤SOC_cal1 (the SOC_cal1 constant can be calibrated, preferably 5%, which is only for example and not a unique value), it is considered that there is no abnormality in the low-voltage power consumption of the entire vehicle.

[0070] If SOC_cal2<SOC4-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, and the high-voltage power battery charges the low-voltage battery (the one or two without faults). When the battery is fully charged, the VCU starts to control DCDC1 and DCDC2 to shut down, 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, DCDC1 and DCDC2, 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.

[0071] If SOC1-SOCx≤SOC_cal2 (SOC_cal2 constant value can be calibrated, preferably 1%, which is only for example and not a unique value), the VCU starts to control DCDC1 and DCDC2 to shut down, and the VCU comprehensively coordinates the BMS, DCDC1, DCDC2, and two low-voltage battery power monitors to sleep, and counts before sleeping, and repeats the above operations.

[0072] The control method corresponding to working condition 4 is as follows:

[0073] Control the status of DCDC1 and DCDC2, such as Figure 6As shown. The output voltages of DCDC1 and DCDC2 are controlled as 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, and U3 > U1 (U1 corresponding to the above working condition 1).

[0074] 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 the low-voltage accessories, reducing the overall vehicle power consumption, and saving charging electrical energy; when one of the DCDCs fails, the standby DCDC is used in time to effectively ensure the power level of the low-voltage battery and prevent discharging.

[0075] Table 5

[0076]

[0077]

[0078] The 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, a detecting module 53, and a control module 54. The receiving module 51 is configured to receive a power-off instruction of the target vehicle, where 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: controlling the first DCDC converter to turn off, controlling the second DCDC converter to turn off. The obtaining module 52 is configured to obtain the ambient temperature of the target vehicle and the power consumption of the low-voltage battery, where there are at least two low-voltage batteries, and the at least two low-voltage batteries are arranged in parallel. The detecting module 53 is configured to detect the first working condition information of the low-voltage battery before this power-off, where the first working condition information includes at least one of the following: non-fault state, fault state. The control module 54 is configured to generate a charging instruction based on the ambient temperature and the first working condition information of the low-voltage battery, where the charging instruction is used to control the power management system to charge the low-voltage battery.

[0079] 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: controlling the first DCDC converter to be turned off, controlling the second DCDC converter to be turned off. Step S2: Obtain the ambient temperature of the target vehicle and the power consumption of the low-voltage battery, wherein there are at least two low-voltage batteries, and at least two low-voltage batteries are arranged in parallel. Step S3: Detect the first operating condition information of the low-voltage battery before the power-off, wherein the first operating condition information includes at least one of the following: non-fault state, fault state. Step S4: Generate a power-on instruction based on the ambient temperature and the first operating condition information of the low-voltage battery, wherein the power-on instruction is used to control the power management system to power the low-voltage battery.

[0080] The embodiment of the present application also provides a processor, which is configured to run a computer program to perform the steps in any of the above method embodiments. Optionally, in this embodiment, the above processor can be configured to perform 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: controlling the first DCDC converter to be turned off, controlling the second DCDC converter to be turned off. Step S2: Obtain the ambient temperature of the target vehicle and the power consumption of the low-voltage battery, wherein there are at least two low-voltage batteries, and at least two low-voltage batteries are arranged in parallel. Step S3: Detect the first operating condition information of the low-voltage battery before the power-off, wherein the first operating condition information includes at least one of the following: non-fault state, fault state. Step S4: Generate a power-on instruction based on the ambient temperature and the first operating condition information of the low-voltage battery, wherein the power-on instruction is used to control the power management system to power the low-voltage battery.

[0081] The embodiment of the present application also provides an electronic device, including 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 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: controlling the first DCDC converter to be turned off, controlling the second DCDC converter to be turned off. Step S2: Obtain the ambient temperature of the target vehicle and the power consumption of the low-voltage battery, wherein there are at least two low-voltage batteries, and at least two low-voltage batteries are arranged in parallel. Step S3: Detect the first operating condition information of the low-voltage battery before the power-off, wherein the first operating condition information includes at least one of the following: non-fault state, fault state. Step S4: Generate a power-on instruction based on the ambient temperature and the first operating condition information of the low-voltage battery, wherein the power-on instruction is used to control the power management system to power the low-voltage battery.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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: controlling the first DCDC converter to shut down, controlling the second DCDC converter to shut down; Obtaining the ambient temperature of the target vehicle and the power consumption of the low-voltage battery, wherein there are at least two low-voltage batteries, and at least two of the low-voltage batteries are arranged in parallel; Detecting first operating condition information of the low-voltage battery before the power-off, wherein the first operating condition information includes at least one of the following: a non-fault state and a fault state; Based on the ambient temperature and the first operating condition information of the low-voltage battery, generating a power replenishment instruction, wherein the power replenishment instruction is used to control the power management system to replenish power for the low-voltage battery; Based on the ambient temperature and the first operating condition information of the low-voltage battery, generating a power replenishment instruction, including: when the ambient temperature meets the first preset condition and all the low-voltage batteries are in a non-fault state before the power-off, determining whether the average power consumption of all the low-voltage batteries is greater than a first power threshold; If yes, detecting the current second operating condition information of all the low-voltage batteries, where the second operating condition information includes at least one of the following: a non-fault state and a fault state; Based on the second operating condition information, the power replenishment instruction controls the power management system to replenish power for the low-voltage battery that is currently in a non-fault state; After the low-voltage battery currently in a non-fault state is fully charged, controlling the power management system to perform a preset power-off operation; When the ambient temperature satisfies the second preset condition and only the first low-voltage battery is in a non-fault state before the power-off, determining whether the power consumption of the first low-voltage battery is greater than a second power threshold; If not, determining whether the power consumption of the first low-voltage battery is greater than a third power threshold; If yes, the power replenishment instruction is used to control the power management system to replenish power for the first low-voltage battery; After the first low-voltage battery is fully charged, controlling the power management system to perform a preset power-off operation; When the ambient temperature satisfies the third preset condition and only the second low-voltage battery is in a non-fault state before the power-off, determining whether the power consumption of the second low-voltage battery is greater than a fourth power threshold; If yes, the power management system controls the high-voltage power battery to continue to remain in a powered-off state; The first preset condition, the second preset condition and the third preset condition are all the duration of the ambient temperature being within a preset temperature range, and different preset temperature ranges correspond to different durations.

2. The control method according to claim 1, characterized in that: Generating a charging instruction based on the ambient temperature and the first operating condition information of the low-voltage battery includes: When the ambient temperature meets a preset condition, the monitoring system of the power management system is awakened to measure the power consumption of the low-voltage battery.

3. The control method according to claim 1, characterized in that: Generating a charging instruction based on the ambient temperature and the first operating condition information of the low-voltage battery includes: 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. The control method according to claim 1, characterized in that: 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, including: Before the power-off, obtaining the fault conditions of the first DCDC converter and the second DCDC converter; When the power management system executes the power replenishment instruction, only the DCDC converter without fault is turned on.

5. 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: controlling the first DCDC converter to shut down, controlling the second DCDC converter to shut down; An acquisition module, the acquisition module is used to acquire the ambient temperature of the target vehicle and the power consumption of the low-voltage battery, wherein there are at least two low-voltage batteries, and at least two of the low-voltage batteries are arranged in parallel; A detection module, the detection module is used to detect the first operating condition information of the low-voltage battery before the power-off, wherein the first operating condition information includes at least one of the following: a non-fault state and a fault state; A control module, wherein the control module generates a power replenishment instruction based on the ambient temperature and the first operating condition information of the low-voltage battery, wherein the power replenishment instruction is to replenish power for the low-voltage battery; Generating a charging instruction based on the ambient temperature and the first operating condition information of the low-voltage battery includes: When the ambient temperature satisfies the first preset condition and all the low-voltage batteries are in a non-fault state before the power-off, determining whether the average power consumption of all the low-voltage batteries is greater than a first power threshold; If yes, detecting the current second operating condition information of all the low-voltage batteries, where the second operating condition information includes at least one of the following: a non-fault state and a fault state; Based on the second operating condition information, the power replenishment instruction controls the power management system to replenish power for the low-voltage battery that is currently in a non-fault state; After the low-voltage battery currently in a non-fault state is fully charged, controlling the power management system to perform a preset power-off operation; When the ambient temperature satisfies the second preset condition and only the first low-voltage battery is in a non-fault state before the power-off, determining whether the power consumption of the first low-voltage battery is greater than a second power threshold; If not, determining whether the power consumption of the first low-voltage battery is greater than a third power threshold; If yes, the power replenishment instruction is used to control the power management system to replenish power for the first low-voltage battery; After the first low-voltage battery is fully charged, controlling the power management system to perform a preset power-off operation; When the ambient temperature satisfies the third preset condition and only the second low-voltage battery is in a non-fault state before the power-off, determining whether the power consumption of the second low-voltage battery is greater than a fourth power threshold; If yes, the power management system controls the high-voltage power battery to continue to remain in a powered-off state; The first preset condition, the second preset condition and the third preset condition are all the duration of the ambient temperature being within a preset temperature range, and different preset temperature ranges correspond to different durations.

6. 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 method according to any one of claims 1 to 4.

7. 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 method according to any one of claims 1 to 4.

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