Low-voltage power supply system and vehicle

Abstract

The invention discloses a low-voltage power supply system and a vehicle, the low-voltage power supply system is used for connecting a low-voltage load, and comprises a first power supply, at least one second power supply and a control module; a first power supply loop is formed between the first power supply and the low-voltage load; a second power supply loop is formed between each second power supply and the low-voltage load; and the control module is used for controlling all the second power supply loops to be in an open-circuit state when the first power supply loop is in a normal state, and controlling at least one second power supply loop in a normal state to be in a closed-circuit state when the first power supply loop is in a fault state. In the low-voltage power supply system, the control module enables the second power supply loop to be in the open-circuit state when the first power supply loop is in the normal state, and controls the second power supply loop to supply power only in the fault state, so that the working time of the second power supply can be shortened, and aging failure of the second power supply caused by long-term use is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular, to a low-voltage power supply system and a vehicle. Background Art

[0002] The low-voltage power supply system of a vehicle is mainly used to provide low-voltage power (for example, 12V or 14V power) to the vehicle to support the operation of various electronic devices and control systems. Its power supply reliability is a key link in the reliability of the vehicle control. For example, in a vehicle integrated with an autonomous driving system, the driver will, to a certain extent, not need to monitor the operation of the vehicle, and the relevant operations will be mainly performed by the autonomous driving system and its actuators. The low-voltage power supply system provides power for the autonomous driving system and its actuators, and its power supply reliability is a key link affecting the reliability of the vehicle control.

[0003] In existing vehicles, the low-voltage power supply system often adopts a dual-power redundancy method of simple main power supply and backup power supply cooperation. The main power supply and the backup power supply will be continuously connected to the low-voltage power grid during the vehicle operation for charging and discharging. In this way, the backup power supply used as redundancy will be continuously in a working state, resulting in a lower life of the backup power supply and increasing the risk of battery failure. Summary of the Invention

[0004] Embodiments of the present invention provide a low-voltage power supply system and a vehicle to solve the problems in the existing low-voltage power supply system that the backup battery used as redundancy has a short life and a high failure risk.

[0005] Embodiments of the present invention provide a low-voltage power supply system for connecting a low-voltage load, including a first power supply, at least one second power supply, and a control module; A first power supply circuit is formed between the first power supply and the low-voltage load; A second power supply circuit is formed between each second power supply and the low-voltage load; The control module is connected to the first power supply circuit and at least one of the second power supply circuits, and is used to detect the states of the first power supply circuit and the second power supply circuits. When the first power supply circuit is in a normal state, control all the second power supply circuits to be in an open state. When the first power supply circuit is in a fault state, control at least one of the second power supply circuits in a normal state to be in a conducting state.

[0006] Preferably, the control module includes a distribution box; The first power supply is connected to the distribution box through a first power supply link, and the distribution box is connected to the low-voltage load through a second power supply link to form the first power supply circuit; Each of the second power supplies is connected to the distribution box through a third power supply link, and the distribution box is connected to the low-voltage load through a second power supply link, forming a second power supply loop; The distribution box is used to collect distribution detection data, and the distribution detection data includes power supply detection data corresponding to the first power supply and power supply detection data corresponding to the first power supply link; The distribution box is used to determine that the first power supply loop is in a normal state when the power supply detection data corresponding to the first power supply does not meet the power supply fault condition and the power supply detection data corresponding to the first power supply link does not meet the power supply fault condition; It is also used to determine that the first power supply loop is in a fault state when the power supply detection data corresponding to the first power supply meets the power supply fault condition, or the power supply detection data corresponding to the first power supply link meets the power supply fault condition.

[0007] Preferably, the low-voltage power supply system further includes at least one of a vehicle control unit and an intelligent driving system; The distribution box is electrically connected to the vehicle control unit through a fourth power supply link, and / or the distribution box is communicatively connected to the vehicle control unit through a first communication link; The distribution box is electrically connected to the intelligent driving system through a fifth power supply link; The distribution detection data includes communication detection data corresponding to the first communication link, and power supply detection data corresponding to the first power supply link, the fourth power supply link, and the fifth power supply link; The distribution box is used to determine that the first power supply loop is in a normal state when the power supply detection data corresponding to the first power supply does not meet the power supply fault condition, the communication detection data corresponding to the first communication link does not meet the communication fault condition, and the power supply detection data corresponding to the first power supply link, the fourth power supply link, and the fifth power supply link do not meet the power supply fault condition; It is also used to determine that the first power supply loop is in a fault state when the power supply detection data corresponding to the first power supply meets the power supply fault condition, or the communication detection data corresponding to the first communication link meets the communication fault condition, or at least one of the power supply detection data corresponding to the first power supply link, the fourth power supply link, and the fifth power supply link meets the power supply fault condition.

[0008] Preferably, the control module includes a battery management system; The battery management system is connected to the first power supply circuit and at least one of the second power supply circuits, and is used to collect power management data. When the power management data does not meet the power management fault assessment conditions, it determines that the first power supply circuit is in a normal state; when the power management data meets the power management fault assessment conditions, it determines that the first power supply circuit is in a fault state.

[0009] Preferably, the low-voltage power supply system further includes a distribution box; The first power supply is connected to the distribution box through a first power supply link, and the distribution box is connected to a low-voltage load through a second power supply link, forming the first power supply circuit; Each second power supply is connected to the distribution box through a third power supply link, and the distribution box is connected to a low-voltage load through a second power supply link, forming one of the second power supply circuits; The battery management system is connected to at least one of the third power supply links and the distribution box; The power management data includes power detection data corresponding to the first power supply and interface detection data between the distribution box and the first power supply; The battery management system is used to determine that the first power supply circuit is in a normal state when the power detection data corresponding to the first power supply does not meet the power fault conditions and the interface detection data between the distribution box and the first power supply does not meet the power supply fault conditions; It is also used to determine that the first power supply circuit is in a fault state when the power detection data corresponding to the first power supply meets the power fault conditions or the interface detection data between the distribution box and the first power supply meets the power supply fault conditions.

[0010] Preferably, the low-voltage power supply system includes a distribution box, and also includes at least one of a vehicle control unit and an intelligent driving system; The first power supply is connected to the distribution box through a first power supply link, the distribution box is connected to a low-voltage load through a second power supply link, the distribution box is connected to the vehicle control unit through a fourth power supply link, and the distribution box is connected to the intelligent driving system through a fifth power supply link, forming the first power supply circuit; Each second power supply is connected to the distribution box through a third power supply link, the distribution box is connected to a low-voltage load through a second power supply link, the distribution box is connected to the vehicle control unit through a fourth power supply link, and the distribution box is connected to the intelligent driving system through a fifth power supply link, forming the second power supply circuit; The battery management system is connected to at least one of the third power supply links and the distribution box; The battery management system is connected to the vehicle control unit through a second communication link; The power management data includes power detection data corresponding to the first power source, interface detection data between the power distribution box and at least one of the first power source, low-voltage load, vehicle control unit, and intelligent driving system, and communication detection data corresponding to the second communication link; The battery management system is configured to determine that the first power supply circuit is in a normal state when the power detection data corresponding to the first power source does not meet the power failure condition, the communication detection data corresponding to the second communication link does not meet the communication failure condition, and the interface detection data between the power distribution box and the first power source, low-voltage load, vehicle control unit, and intelligent driving system do not meet the power supply failure condition; It is further configured to determine that the first power supply circuit is in a fault state when the power detection data corresponding to the first power source meets the power failure condition, or the communication detection data corresponding to the second communication link meets the communication failure condition, or the interface detection data between the power distribution box and at least one of the first power source, low-voltage load, vehicle control unit, and intelligent driving system meets the power supply failure condition.

[0011] Preferably, the control module includes the vehicle control unit and at least one of the power distribution box and the battery management system; The first power source is connected to the power distribution box through a first power supply link, and the power distribution box is connected to the low-voltage load through a second power supply link to form the first power supply circuit; Each second power source is connected to the power distribution box through a third power supply link, and the power distribution box is connected to the low-voltage load through a second power supply link to form the second power supply circuit; The battery management system is connected to at least one of the third power supply links; The vehicle control unit is connected to the power distribution box through a first communication link for obtaining the power distribution detection data collected by the power distribution box, and / or the vehicle control unit is connected to the battery management system through a second communication link for obtaining the power management data collected by the battery management system; The vehicle control unit is configured to determine that the first power supply circuit is in a normal state and control all the second power supply circuits to be in an open state when the power distribution detection data does not meet the power distribution failure evaluation condition and the power management data does not meet the power management failure evaluation condition; and determine that the first power supply circuit is in a fault state and control at least one second power supply circuit in a normal state to be in an open state when the power distribution detection data meets the power distribution failure evaluation condition or the power management data meets the power management failure evaluation condition.

[0012] Preferably, the control module further includes an intelligent driving system, and the vehicle control unit is connected to the intelligent driving system through a third communication link for collecting control unit detection data; The vehicle control unit is configured to determine that the first power supply circuit is in a normal state and control all the second power supply circuits to be in an open state when the data detected by the control unit does not meet the control fault evaluation conditions; and to determine that the first power supply circuit is in a fault state and control at least one of the second power supply circuits in a normal state to be in a conducting state when the data detected by the control unit meets the control fault evaluation conditions.

[0013] Preferably, the data detected by the control unit includes a target instruction triggered by the intelligent driving system and communication detection data corresponding to the third communication link; The control fault evaluation conditions include that the target instruction triggered by the intelligent driving system is a standby power supply instruction for making the second power supply circuit in a conducting state, and / or the communication detection data corresponding to the third communication link meets the communication fault conditions.

[0014] Preferably, controlling all the second power supply circuits to be in an open state includes: The vehicle control unit outputs a second power-off signal to the power distribution box through the first communication link, so that the power distribution box controls all the third power supply links to be disconnected, making all the second power supply circuits in an open state, and / or outputs a second power-off signal to the battery management system through the second communication link, so that the battery management system controls all the third power supply links to be disconnected, making all the second power supply circuits in an open state; Controlling at least one of the second power supply circuits in a normal state to be in a conducting state includes: Outputting a second power-on signal to the power distribution box through the first communication link, so that the power distribution box controls at least one of the third power supply links in a normal state to be conducting, making the second power supply circuit in a conducting state, and / or outputting a second power-on signal to the battery management system through the second communication link, so that the battery management system controls at least one of the third power supply links in a normal state to be conducting, making the second power supply circuit in a conducting state.

[0015] Preferably, the control module is connected to the monitored system and at least one of the second power supply circuits, and is configured to collect monitoring detection data corresponding to the monitored system. When the monitoring detection data does not meet the preset warning conditions, all the second power supply circuits are made to be in an open state; when the monitoring detection data meets the preset warning conditions, at least one of the second power supply circuits in a normal state is made to be in a conducting state.

[0016] Preferably, the monitoring detection data includes a detected voltage value, and the detected voltage value is the voltage value input from the first power supply to the monitored system; The preset warning condition is that the detected voltage value is not within the preset voltage threshold range.

[0017] Preferably, the control module includes an intelligent driving system and / or a vehicle control unit; In the intelligent driving system and / or the vehicle control unit, at least one power input monitoring module is provided, and each power input monitoring module is used to connect to a monitored system for collecting monitoring detection data corresponding to the monitored system; The power input monitoring module is hard-wired to at least one of the second power supply circuits, and is used to open all the second power supply circuits when the monitoring detection data does not meet the preset warning condition, and to make at least one of the second power supply circuits in a normal state in a conducting state when the monitoring detection data meets the preset warning condition.

[0018] Preferably, the control module is used to perform an alarm operation when all the second power supply circuits are in a faulty state.

[0019] An embodiment of the present invention further provides a vehicle, including a low-voltage load and the low-voltage power supply system described in any one of the above.

[0020] An embodiment of the present invention provides a low-voltage power supply system and a vehicle. In this low-voltage power supply system, when the first power supply circuit is in a faulty state, the control module can change the second power supply circuit from an open state to a conducting state, and use the second power supply to perform redundant power supply for the low-voltage load, so as to ensure that the low-voltage load can still work normally when the first power supply fails. In this embodiment, the second power supply is only controlled to be connected for power supply in a faulty state, which can reduce the working duration of the second power supply and avoid the second power supply aging and failing due to long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0022] Figure 1 is a block diagram structural schematic diagram of a low-voltage power supply system in an embodiment of the present invention; Figure 2 is another block diagram structural schematic diagram of a low-voltage power supply system in an embodiment of the present invention; Figure 3 is another block diagram structural schematic diagram of a low-voltage power supply system in an embodiment of the present invention; Figure 4It is another schematic block diagram structure of the low-voltage power supply system in an embodiment of the present invention.

[0023] In the figure: 1. First power supply; 2. Second power supply; 3. Control module; 31. Distribution box; 32. Vehicle control unit; 33. Intelligent driving system; 34. Battery management system. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] The embodiment of the present invention provides a low-voltage power supply system for connecting low-voltage loads, such as Figure 1 As shown, it includes a first power supply 1, at least one second power supply 2, and a control module 3; a first power supply loop is formed between the first power supply 1 and the low-voltage load; a second power supply loop is formed between each second power supply 2 and the low-voltage load; the control module 3 is connected to the first power supply loop and at least one second power supply loop, and is used to detect the states of the first power supply loop and the second power supply loop. When the first power supply loop is in a normal state, control all second power supply loops to be in an open state. When the first power supply loop is in a fault state, control at least one second power supply loop in a normal state to be in a conducting state.

[0026] Among them, the fault states include a first fault state and a second fault state. The first fault state is used to characterize at least one of a power supply fault, a communication fault, and a device fault in the low-voltage power supply system. The power supply fault includes but is not limited to a power supply voltage loss, a power supply undervoltage fault, a power supply overvoltage fault, a power supply overcurrent fault, etc. The power supply undervoltage fault can be defined as the voltage being detected below the limit undervoltage threshold (e.g., the voltage is below 8V when the temperature is greater than 0 degrees, excluding the detection debounce time) within the FTTI time (e.g., 200ms). The power supply overvoltage fault can be defined as the voltage being detected above the limit overvoltage threshold (e.g., the voltage is above 16V when the temperature is greater than 0 degrees, excluding the detection debounce time) within the FTTI time (e.g., 200ms). The power supply overcurrent fault can be defined as the current being detected above the limit overcurrent threshold (e.g., the discharge current is greater than 400A, excluding the detection debounce time) within the FTTI time (e.g., 200ms). The communication fault includes but is not limited to faults such as communication errors, communication signal loss, communication signal jamming, etc. The communication error can be defined as the communication E2E check not passing within the FTTI time (e.g., 200ms), etc. The device fault includes the first power supply 1 itself having a fault and the control module 3 connected to the first power supply 1 itself having a fault, etc. When the detection data collected by the control module 3 reaches the preset warning condition, the low-voltage power supply system is in the second fault state, where the preset warning condition is a condition for determining whether the current second power supply circuit is about to enter the first fault state. Correspondingly, the normal state of the low-voltage power supply system is a state where neither the first fault state nor the second fault state appears in the power supply circuit.

[0027] As an example, the low-voltage power supply system includes a first power source 1, a second power source 2, and a control module 3. The first power source 1 and the second power source 2 are used to connect to low-voltage loads, which can be, but are not limited to, entertainment facilities, lighting systems, and intelligent driving systems assembled in a vehicle. The first power source 1 can be a 12V low-voltage power supply, which is connected to the low-voltage load to form a first power supply loop. The first power supply loop is in a normally closed state when the first power supply loop is in a normal state, and continuously supplies power to the low-voltage load. The second power source 2 can be a 12V low-voltage battery, which is connected to the low-voltage load to form a second power supply loop. The second power supply loop is in an open state when the first power supply loop is in a normal state, and does not supply power to the low-voltage power supply system. It is only enabled when the first power supply loop is in a fault state to supply power to the low-voltage load. The control module 3 is used to detect whether the first power supply loop is in a fault state, and when the first power supply loop is in a fault state, briefly control to connect each second power supply loop to test whether the second power supply loop is in a normal state, and finally connect at least one second power supply loop in a normal state to use the second power source 2 to supply power to the low-voltage load, so as to ensure that the low-voltage load can still work normally when the first power supply loop fails. Among them, some control modules 3 can also be used as low-voltage loads that use the electrical energy of the first power source 1 or the second power source 2, and are respectively connected to the first power source 1 and the second power source 2 through power supply links, and jointly form a power supply loop with other low-voltage loads to receive the electrical energy output by the first power source 1 and the second power source 2, and directly detect the power supply faults in the power supply loop through the power supply links. The power supply loop also includes a communication link that connects several different control modules 3 or connects the control module 3 and the low-voltage load. The control module 3 detects the communication faults in the power supply loop through the communication link to determine whether the first power supply loop is in a fault state.

[0028] In this example, the low-voltage power supply system can achieve that when the first power supply loop is in a normal state, at least one second power supply loop is in an open state, so that the second power source 2 does not supply power to the low-voltage load; when the first power supply loop is in a fault state, at least one second power supply loop is in a conducting state, so that the second power source 2 supplies power to the low-voltage load, which can reduce the working duration of the second power source 2 and avoid the second power source 2 aging and failing due to long-term use.

[0029] In an embodiment, as Figure 1As shown, the control module 3 includes a power distribution box 31; the first power supply 1 is connected to the power distribution box 31 through the first power supply link U1, and the power distribution box 31 is connected to the low-voltage load through the second power supply link U2 to form a first power supply loop; each second power supply 2 is connected to the power distribution box 31 through a third power supply link U3, and the power distribution box 31 is connected to the low-voltage load through the second power supply link U2 to form a second power supply loop; the power distribution box 31 is used to collect power distribution detection data, and the power distribution detection data includes the power supply detection data corresponding to the first power supply 1 and the power supply detection data corresponding to the first power supply link U1; the power distribution box 31 is used to determine that the first power supply loop is in a normal state when the power supply detection data corresponding to the first power supply 1 does not meet the power supply fault condition and the power supply detection data corresponding to the first power supply link U1 does not meet the power supply fault condition; it is also used to determine that the first power supply loop is in a fault state when the power supply detection data corresponding to the first power supply 1 meets the power supply fault condition, or the power supply detection data corresponding to the first power supply link U1 meets the power supply fault condition.

[0030] Among them, the power distribution detection data is the data collected by the power distribution box 31 and is used to judge whether the current first power supply loop is in the first fault state.

[0031] As an example, the control module 3 may include a power distribution box 31. The first power supply 1 is connected to the power distribution box 31 through the first power supply link U1, and the power distribution box 31 is connected to the low-voltage load through the second power supply link U2 to form a first power supply loop; the second power supply 2 is connected to the power distribution box 31 through the third power supply link U3, and the power distribution box 31 is connected to the low-voltage load through the second power supply link U2 to form a second power supply loop. The power distribution box 31 is used to centrally manage and distribute the electric energy output by the first power supply 1 to be delivered to the low-voltage load, and is also used to collect power distribution detection data, which may include the power supply detection data corresponding to the first power supply 1 and the power supply detection data corresponding to the first power supply link U1. When the power supply detection data corresponding to the first power supply 1 does not meet the power supply fault condition and the power supply detection data corresponding to the first power supply link U1 does not meet the power supply fault condition, the power distribution box 31 can determine that the first power supply loop is in a normal state. When the power supply detection data corresponding to the first power supply 1 meets the power supply fault condition, or the power supply detection data corresponding to the first power supply link U1 meets the power supply fault condition, the power distribution box 31 can determine that the first power supply loop is in the first fault state. Among them, the power supply detection data may be the power supply temperature, the remaining power of the previous power supply, etc. Correspondingly, the power supply fault condition may include that the current power supply temperature is greater than the preset temperature threshold, the current remaining power of the power supply is less than the preset power threshold, etc. The power supply detection data may include the power supply link voltage within the FTTI time (such as 200 ms). Correspondingly, the power supply fault condition may include that the power supply link voltage is lower than the limit undervoltage threshold within the FTTI time (such as 200 ms).

[0032] Furthermore, the power distribution detection data may further include the power source detection data corresponding to the second power source 2 and the power supply detection data corresponding to the third power supply link U3. Specifically, after the power distribution box 31 determines that the first power supply loop is in a fault condition and before controlling the second power supply loop to be in a conducting state, each third power supply link U3 can be briefly connected, and the power supply detection data corresponding to each third power supply link U3 and the power source detection data corresponding to the second power source 2 can be obtained. If the power supply detection data corresponding to a third power supply link U3 does not meet the power supply fault condition and the power source detection data corresponding to the second power source 2 connected to the third power supply link U3 does not meet the power source fault condition, the power distribution box 31 can determine that the second power supply loop where the third power supply link U3 is located is in a normal state. Finally, the power distribution box 31 turns on at least one second power supply loop in the normal state to supply power to the low-voltage load using the second power source 2.

[0033] In one embodiment, the low-voltage power supply system further includes at least one of a vehicle control unit 32 and an intelligent driving system 33; the power distribution box 31 is electrically connected to the vehicle control unit 32 through a fourth power supply link U4, and / or, the power distribution box 31 is communicatively connected to the vehicle control unit 32 through a first communication link S1; the power distribution box 31 is electrically connected to the intelligent driving system 33 through a fifth power supply link U5; the power distribution detection data includes the communication detection data corresponding to the first communication link S1, and the power supply detection data corresponding to the first power supply link U1, the fourth power supply link U4, and the fifth power supply link U5; the power distribution box 31 is configured to determine that the first power supply loop is in a normal state when the power source detection data corresponding to the first power source 1 does not meet the power source fault condition, the communication detection data corresponding to the first communication link S1 does not meet the communication fault condition, and the power supply detection data corresponding to the first power supply link U1, the fourth power supply link U4, and the fifth power supply link U5 do not meet the power supply fault condition; and is further configured to determine that the first power supply loop is in a fault state when the power source detection data corresponding to the first power source 1 meets the power source fault condition, or the communication detection data corresponding to the first communication link S1 meets the communication fault condition, or at least one of the power supply detection data corresponding to the first power supply link U1, the fourth power supply link U4, and the fifth power supply link U5 meets the power supply fault condition.

[0034] As an example, the low-voltage power supply system further includes at least one of a vehicle control unit 32 and an intelligent driving system 33. When the vehicle control unit 32 is included in the low-voltage power supply system, the distribution box 31 can be electrically connected to the vehicle control unit 32 through the fourth power supply link U4, and / or the distribution box 31 can be communicatively connected to the vehicle control unit 32 through the first communication link S1. At this time, the power distribution detection data collected by the distribution box 31 can include at least one of the power detection data corresponding to the first power supply 1, the power supply detection data corresponding to the first power supply link S1, the power supply detection data corresponding to the second power supply link U2, the power supply detection data corresponding to the fourth power supply link U4, and the communication detection data corresponding to the first communication link S1. When the distribution box 31 detects that the power detection data corresponding to the first power supply 1 meets the power failure condition, it can be determined that a device failure has occurred in the current first power supply 1, and then it can be determined that the current first power supply circuit is in the first failure state. When the distribution box 31 detects that the power supply detection data corresponding to a certain power supply link in the above power supply links meets the power supply failure condition, it can be determined that there is a power supply failure on that link, and then it can be determined that the current first power supply circuit is in the first failure state. When the distribution box 31 detects that the communication detection data corresponding to the first communication link S1 meets the communication failure condition, it can be determined that the current first communication link S1 fails or the vehicle control unit 32 fails, and then it can be determined that the low-voltage power supply system is in the first failure state, where the communication failure condition can include that the communication E2E check fails within the FTTI time (such as 200 ms), receiving an error signal sent by a device communicatively connected to this link based on its own failure, etc.

[0035] When the intelligent driving system 33 is included in the low-voltage power supply system, the distribution box 31 can be electrically connected to the intelligent driving system 33 through the fifth power supply link U5. At this time, the power distribution detection data collected by the distribution box 31 can include at least one of the power detection data corresponding to the first power supply 1, the power supply detection data corresponding to the first power supply link U1, the power supply detection data corresponding to the second power supply link U2, and the power supply detection data corresponding to the fifth power supply link U5. When the distribution box 31 detects that the power detection data corresponding to the first power supply 1 meets the power failure condition, it can be determined that a device failure has occurred in the current first power supply 1, and then it can be determined that the current first power supply circuit is in the first failure state; when the distribution box 31 detects that the power supply detection data corresponding to a certain power supply link in the above power supply links meets the power supply failure condition, it can be determined that there is a power supply failure on that link, and then it can be determined that the current first power supply circuit is in the first failure state.

[0036] When both a vehicle control unit 32 and an intelligent driving system 33 are included in a low-voltage power supply system, the power distribution box 31 can be electrically connected to the vehicle control unit 32 through a fourth power supply link U4, and the power distribution box 31 can be electrically connected to the intelligent driving system 33 through a fifth power supply link U5, and / or, the power distribution box 31 can be communicatively connected to the vehicle control unit 32 through a first communication link S1. At this time, the power distribution detection data collected by the power distribution box 31 can include at least one of the power detection data corresponding to the first power supply 1, the power supply detection data corresponding to the first power supply link U1, the power supply detection data corresponding to the second power supply link U2, the power supply detection data corresponding to the fourth power supply link U4, the power supply detection data corresponding to the fifth power supply link U5, and the communication detection data corresponding to the first communication link S1. When the power distribution box 31 detects that the power detection data corresponding to the first power supply 1 meets the power failure condition, it can determine that a device failure has occurred in the current first power supply 1, and further determine that the current first power supply circuit is in a first failure state; when the power distribution box 31 detects that the power supply detection data corresponding to a certain power supply link in the above power supply links meets the power supply failure condition, it can determine that there is a power supply failure on that link, and further determine that the current first power supply circuit is in a first failure state; when the power distribution box 31 detects that the communication detection data corresponding to the first communication link S1 meets the communication failure condition, it can determine that the current first communication link S1 fails or the vehicle control unit 32 fails, and further determine that the first power supply circuit is in a first failure state.

[0037] In one embodiment, the control module 3 includes a battery management system 34; the battery management system 34 is connected to the first power supply circuit and at least one second power supply circuit, and is configured to collect power management data. When the power management data does not meet the power management failure assessment condition, it is determined that the first power supply circuit is in a normal state; when the power management data meets the power management failure assessment condition, it is determined that the first power supply circuit is in a failure state.

[0038] As an example, the control module 3 may include a battery management system 34. The battery management system 34 is connected to the first power supply circuit and at least one second power supply circuit. The battery management system 34 can collect power management data. When the power management data does not meet the power management fault assessment condition, the battery management system 34 can determine that the first power supply circuit is in a normal state; when the power management data meets the power management fault assessment condition, the battery management system 34 can determine that the first power supply circuit is in a first fault state. The power management data is data used to evaluate whether there is a first fault state in the first power supply circuit. For example, the power management data may include the power temperature corresponding to the first power supply 1, the remaining power of the power supply, etc. The power management fault assessment condition is set based on the power management data and is used to evaluate whether the obtained power management data indicates that the first power supply circuit is in a first fault state. For example, the current power temperature is greater than a preset temperature threshold, and the current remaining power of the power supply is less than a preset power threshold, etc.

[0039] Further, the power management data may include first power management data corresponding to the first power supply circuit and second power management data corresponding to the second power supply circuit. The first power management data is data used to evaluate whether there is a first fault state in the first power supply circuit, and the second power management data is data used to evaluate whether there is a first fault state in the second power supply circuit. For example, the second power management data may include power detection data corresponding to the second power supply 2 and interface detection data between the power distribution box 31 and the second power supply 2. Specifically, after the battery management system 34 determines that the first power supply circuit is in a fault condition and before controlling the second power supply circuit to be in a conducting state, each third power supply link U3 can be briefly connected, and the power detection data corresponding to each second power supply 2 and the interface detection data between the power distribution box 31 and each second power supply 2 can be obtained. If the interface detection data between a second power supply 2 and the power distribution box 31 does not meet the power supply fault condition and the power detection data corresponding to the second power supply 2 does not meet the power fault condition, the power distribution box 31 can determine that the second power supply circuit where the second power supply 2 is located is in a normal state. Finally, the battery management system 34 connects at least one second power supply circuit in a normal state to supply power to the low-voltage load using the second power supply 2.

[0040] In one embodiment, the low-voltage power supply system further includes a distribution box 31; the first power supply 1 is connected to the distribution box 31 through a first power supply link U1, and the distribution box 31 is connected to the low-voltage load through a second power supply link U2 to form a first power supply loop; each second power supply 2 is connected to the distribution box 31 through a third power supply link U3, and the distribution box 31 is connected to the low-voltage load through the second power supply link U2 to form a second power supply loop; the battery management system 34 is connected to at least one third power supply link U3 and the distribution box 31; the power management data includes the power detection data corresponding to the first power supply 1 and the interface detection data between the distribution box 31 and the first power supply 1; the battery management system 34 is configured to determine that the first power supply loop is in a normal state when the power detection data corresponding to the first power supply 1 does not meet the power failure condition and the interface detection data between the distribution box 31 and the first power supply 1 does not meet the power supply failure condition; and is further configured to determine that the first power supply loop is in a failure state when the power detection data corresponding to the first power supply 1 meets the power failure condition or the interface detection data between the distribution box 31 and the first power supply 1 meets the power supply failure condition.

[0041] As an example, when the first power supply system includes a distribution box 31, the first power supply 1 is connected to the distribution box 31 through a first power supply link U1, and the distribution box 31 is connected to the low-voltage load through a second power supply link U2 to form a first power supply loop; each second power supply 2 is connected to the distribution box 31 through a third power supply link U3, and the distribution box 31 is connected to the low-voltage load through the second power supply link U2 to form a second power supply loop. The battery management system 34 is connected to at least one third power supply link U3 and the distribution box 31. At this time, the power management data obtained by the battery management system 34 includes the power detection data corresponding to the first power supply 1 and the interface detection data on the connection interface between the distribution box 31 and the first power supply 1. When the power detection data corresponding to the first power supply 1 meets the power failure condition or the interface detection data meets the power supply failure condition, the battery management system 34 can determine that the first power supply loop is in a first failure state and control to turn on at least one second power supply loop in a normal state.

[0042] In one embodiment, the low-voltage power supply system includes a power distribution box 31 and at least one of a vehicle control unit 32 and an intelligent driving system 33; a first power supply 1 is connected to the power distribution box 31 through a first power supply link U1, the power distribution box 31 is connected to a low-voltage load through a second power supply link U2, the power distribution box 31 is connected to the vehicle control unit 32 through a fourth power supply link U4, and the power distribution box 31 is connected to the intelligent driving system 33 through a fifth power supply link U5, forming a first power supply loop; each second power supply 2 is connected to the power distribution box 31 through a third power supply link U3, the power distribution box 31 is connected to a low-voltage load through a second power supply link U2, the power distribution box 31 is connected to the vehicle control unit 32 through a fourth power supply link U4, and the power distribution box 31 is connected to the intelligent driving system 33 through a fifth power supply link U5, forming a second power supply loop; a battery management system 34 is connected to at least one third power supply link U3 and the power distribution box 31; the battery management system 34 is connected to the vehicle control unit 32 through a second communication link S2; the power management data includes power detection data corresponding to the first power supply 1, interface detection data between the power distribution box 31 and at least one of the first power supply 1, the low-voltage load, the vehicle control unit 32, and the intelligent driving system 33, and communication detection data corresponding to the second communication link S2; the battery management system 34 is configured to determine that the first power supply loop is in a normal state when the power detection data corresponding to the first power supply 1 does not meet the power failure condition, the communication detection data corresponding to the second communication link S2 does not meet the communication failure condition, and the interface detection data between the power distribution box 31 and the first power supply 1, the low-voltage load, the vehicle control unit 32, and the intelligent driving system 33 do not meet the power supply failure condition; and is further configured to determine that the first power supply loop is in a fault state when the power detection data corresponding to the first power supply 1 meets the power failure condition, or the communication detection data corresponding to the second communication link S2 meets the communication failure condition, or the interface detection data between the power distribution box 31 and at least one of the first power supply 1, the low-voltage load, the vehicle control unit 32, and the intelligent driving system 33 meets the power supply failure condition.

[0043] As an example, when the first power supply system includes a distribution box 31 and also includes a vehicle control unit 32, the vehicle control unit 32 is connected to the distribution box 31 through a fourth power supply link U4. The battery management system 34 is connected to the third power supply link U3 and the distribution box 31, and is also connected to the vehicle control unit 32 through a second communication link S2. At this time, the power management data obtained by the battery management system 34 includes the power detection data corresponding to the first power supply 1, the interface detection data on the connection interfaces between the distribution box 31, the first power supply 1, and the vehicle control unit 32, and the communication data corresponding to the second communication link S2. When the power detection data corresponding to the first power supply 1 meets the power failure condition, or the interface detection data meets the power supply failure condition, or the communication data meets the communication failure condition, the battery management system 34 can determine that the first power supply circuit is in a first failure state and control to turn on at least one second power supply circuit in a normal state.

[0044] When the first power supply system includes a distribution box 31 and also includes an intelligent driving system 33, the intelligent driving system 33 is connected to the distribution box 31 through a fifth power supply link U5. The battery management system 34 is connected to the third power supply link U3 and the distribution box 31. At this time, the power management data obtained by the battery management system 34 includes the power detection data corresponding to the first power supply 1 and the interface detection data on the connection interfaces between the distribution box 31, the first power supply 1, and the intelligent driving system 33. When the power detection data corresponding to the first power supply 1 meets the power failure condition, or the interface detection data meets the power supply failure condition, the battery management system 34 can determine that the first power supply circuit is in a first failure state and control to turn on at least one second power supply circuit in a normal state.

[0045] When the first power supply system includes a distribution box 31 and also includes a vehicle control unit 32 and an intelligent driving system 33, the vehicle control unit 32 is connected to the distribution box 31 through a fourth power supply link U4, the intelligent driving system 33 is connected to the distribution box 31 through a fifth power supply link U5, the battery management system 34 is connected to the third power supply link U3 and the distribution box 31, and is also connected to the vehicle control unit 32 through a second communication link S2. At this time, the power management data obtained by the battery management system 34 includes the power detection data corresponding to the first power supply 1, the interface detection data on the connection interfaces between the distribution box 31, the first power supply 1, the vehicle control unit 32, and the intelligent driving system 33, and also includes the communication data corresponding to the second communication link S2. When the power detection data corresponding to the first power supply 1 meets the power failure condition, or the interface detection data meets the power supply failure condition, or the communication data meets the communication failure condition, the battery management system 34 can determine that the first power supply circuit is in a first failure state and control to turn on at least one second power supply circuit in a normal state.

[0046] In one embodiment, the control module 3 includes a vehicle control unit 32, and further includes at least one of a power distribution box 31 and a battery management system 34; the first power supply 1 is connected to the power distribution box 31 through a first power supply link U1, and the power distribution box 31 is connected to a low-voltage load through a second power supply link U2 to form a first power supply loop; each second power supply 2 is connected to the power distribution box 31 through a third power supply link U3, and the power distribution box 31 is connected to a low-voltage load through a second power supply link U2 to form a second power supply loop; the battery management system 34 is connected to at least one third power supply link U3; the vehicle control unit 32 is connected to the power distribution box 31 through a first communication link S1 for obtaining power distribution detection data collected by the power distribution box 31, and / or, the vehicle control unit 32 is connected to the battery management system 34 through a second communication link S2 for obtaining power management data collected by the battery management system 34; the vehicle control unit 32 is configured to determine that the first power supply loop is in a normal state and control all second power supply loops to be in an open state when the power distribution detection data does not meet the power distribution fault evaluation condition and the power management data does not meet the power management fault evaluation condition; when the power distribution detection data meets the power distribution fault evaluation condition or the power management data meets the power management fault evaluation condition, determine that the first power supply loop is in a fault state and control at least one second power supply loop in a normal state to be in an open state.

[0047] As an example, when the control module 3 includes a vehicle control unit 32 and also includes a power distribution box 31. The first power supply 1 is connected to the power distribution box 31 through a first power supply link U1, and the power distribution box 31 is connected to a low-voltage load through a second power supply link U2 to form a first power supply loop; each second power supply 2 is connected to the power distribution box 31 through a third power supply link U3, and the power distribution box 31 is connected to a low-voltage load through a second power supply link U2 to form a second power supply loop; the battery management system 34 is connected to at least one third power supply link U3; the vehicle control unit 32 is connected to the power distribution box 31 through a first communication link S1, and can communicate to obtain the power distribution detection data collected by the power distribution box 31, and when the power distribution detection data meets the power supply fault evaluation condition, determine that the first power supply loop is in a first fault state, and further control at least one second power supply loop in a normal state to be in an open state. Wherein, the power distribution detection data is detected by the power distribution box 31 and is used to judge whether the current first power supply loop is in a first fault state. Correspondingly, the power distribution fault evaluation condition is set based on the power distribution detection data and is used to evaluate whether the obtained power distribution detection data indicates that the first power supply loop is in a first fault state, such as the current power supply temperature is greater than a preset temperature threshold, the current remaining power of the power supply is less than a preset power threshold, etc.

[0048] When the control module 3 includes the vehicle control unit 32 and also includes the battery management system 34, the battery management system 34 is connected to at least one second power supply circuit, and is also connected to the battery management system 34 through the second communication link S2. It can communicate to obtain the power management data collected by the battery management system 34, and when the power management data meets the power management fault assessment conditions, it determines that the first power supply circuit is in the first fault state, and then controls at least one second power supply circuit in the normal state to be in the open state. Among them, the power management data is data used to evaluate whether there is a first fault state in the first power supply circuit. For example, the power management data may include the power supply temperature corresponding to the first power supply 1, the remaining power of the power supply, etc. The power management fault assessment conditions are set based on the power management data and are used to evaluate whether the obtained power management data indicates that the first power supply circuit is in the first fault state. For example, the current power supply temperature is greater than the preset temperature threshold, and the current remaining power of the power supply is less than the preset power threshold, etc.

[0049] When the control module 3 includes the vehicle control unit 32 and also includes the distribution box 31 and the battery management system 34, the first power supply 1 is connected to the distribution box 31 through the first power supply link U1, and the distribution box 31 is connected to the low-voltage load through the second power supply link U2 to form the first power supply circuit; each second power supply 2 is connected to the distribution box 31 through a third power supply link U3, and the distribution box 31 is connected to the low-voltage load through the second power supply link U2 to form a second power supply circuit; the battery management system 34 is connected to at least one third power supply link U3; the vehicle control unit 32 is connected to the distribution box 31 through the first communication link S1, and the vehicle control unit 32 is connected to the battery management system 34 through the second communication link S2. It can communicate to obtain the power distribution detection data collected by the distribution box 31 and the power management data collected by the battery management system 34, and when the power distribution detection data meets the power fault assessment conditions and / or the power management data meets the power management fault assessment conditions, it determines that the first power supply circuit is in the first fault state, and then controls at least one second power supply circuit in the normal state to be in the open state.

[0050] In an embodiment, the control module 3 further includes an intelligent driving system 33. The vehicle control unit 32 is connected to the intelligent driving system 33 through the third communication link S3 for collecting control unit detection data; the vehicle control unit 32 is configured to determine that the first power supply circuit is in the normal state and control all second power supply circuits to be in the open state when the control unit detection data does not meet the control fault assessment conditions; when the control unit detection data meets the control fault assessment conditions, it determines that the first power supply circuit is in the fault state and controls at least one second power supply circuit in the normal state to be in the conducting state.

[0051] As an example, the control module 3 further includes an intelligent driving system 33. The vehicle control unit 32 is connected to the intelligent driving system 33 through a third communication link S3 for collecting control unit detection data. The third communication link S3 may include a first communication branch and a second communication branch to achieve redundant communication between the intelligent driving system 33 and the vehicle control unit 32 to meet the independence requirements of functional safety. When the vehicle control unit 32 detects that the control unit detection data does not meet the control fault assessment conditions, it can determine that the first power supply circuit is in a normal state and control all second power supply circuits to be in an open state; when the vehicle control unit 32 detects that the control unit detection data meets the control fault assessment conditions, it can determine that the first power supply circuit is in a fault state and control at least one second power supply circuit in a normal state to be in a conducting state. Wherein, the control unit detection data is data collected by the vehicle control unit 32 through the third communication link S3 for judging whether the current first power supply circuit is in a first fault state. Correspondingly, the control fault assessment conditions are conditions set based on the control unit detection data for evaluating whether the obtained control unit detection data indicates that the first power supply circuit is in a first fault state.

[0052] In an embodiment, the control unit detection data includes a target instruction triggered by the intelligent driving system 33 and communication detection data corresponding to the third communication link S3; the control fault assessment conditions include that the target instruction triggered by the intelligent driving system 33 is a standby power supply instruction for making the second power supply circuit in a conducting state, and / or the communication detection data corresponding to the third communication link S3 meets the communication fault conditions.

[0053] As an example, the control unit detection data may include a target instruction triggered by the intelligent driving system 33, such as a target instruction for making the vehicle control unit 32 perform a certain action, and also includes communication detection data corresponding to the third communication link. Correspondingly, the control fault assessment conditions correspond to the control unit detection data. When the target instruction triggered by the intelligent driving system 33 is a standby power supply instruction for making the second power supply circuit in a conducting state, and / or the communication data corresponding to the third communication link S3 meets the communication fault conditions, it is regarded as meeting the control fault assessment conditions. At this time, the vehicle control unit 32 can judge that it is necessary to turn on the second power supply circuit currently, or determine that the current third communication link S3 is faulty, or determine that a device fault has occurred inside the current intelligent driving system 33 to determine that the current first power supply circuit is in a first fault state, and then control at least one second power supply circuit in a normal state to be in a conducting state.

[0054] In one embodiment, controlling all the second power supply circuits to be in an open state includes: the vehicle control unit 32 outputs a second power-off signal to the power distribution box 31 through the first communication link S1, so that the power distribution box 31 controls all the third power supply links U3 to be disconnected, making all the second power supply circuits in an open state, and / or outputs a second power-off signal to the battery management system 34 through the second communication link S2, so that the battery management system 34 controls all the third power supply links U3 to be disconnected, making all the second power supply circuits in an open state; controlling at least one second power supply circuit in a normal state to be in a conducting state includes: outputting a second power-on signal to the power distribution box 31 through the first communication link S1, so that the power distribution box 31 controls at least one third power supply link U3 in a normal state to be conducting, making the second power supply circuit in a conducting state, and / or outputting a second power-on signal to the battery management system 34 through the second communication link S2, so that the battery management system 34 controls at least one third power supply link U3 in a normal state to be conducting, making the second power supply circuit in a conducting state.

[0055] As an example, when the vehicle control unit 32 determines that the first power supply circuit is in a normal state, it can output a second power-off signal to the power distribution box 31 through the first communication link S1, so that the power distribution box 31 controls all the third power supply links U3 to be disconnected, making all the second power supply circuits in an open state, or it can also output a second power-off signal to the battery management system 34 through the second communication link S2, so that the battery management system 34 controls all the third power supply links U3 to be disconnected, making the second power supply circuits in an open state. When the vehicle control unit 32 determines that the first power supply circuit is in a first fault state, it can output a second power-on signal to the power distribution box 31 through the first communication link S1, so that the power distribution box 31 controls at least one third power supply link U3 in a normal state to be conducting, making the second power supply circuit in a conducting state, or it can also output a second power-on signal to the battery management system 34 through the second communication link S2, so that the battery management system 34 controls at least one third power supply link U3 in a normal state to be conducting, making the second power supply circuit in a conducting state.

[0056] In one embodiment, the control module 3 is connected to the monitored system and at least one second power supply circuit, and is used for collecting the monitoring detection data corresponding to the monitored system. When the monitoring detection data does not meet the preset warning conditions, all the second power supply circuits are in an open state; when the monitoring detection data meets the preset warning conditions, at least one second power supply circuit in a normal state is in a conducting state.

[0057] Among them, the monitored system can be the electrical loads in the first power supply circuit and the second power supply circuit, and specifically can include at least one of the drive system, the braking system, the steering system, and the intelligent driving system. The monitored system is connected to the first power supply 1 and at least one second power supply 2. The monitoring detection data is data obtained from the monitored system or from the connection interface between the monitored system and other devices, and is used to evaluate whether there is a second fault state in the first power supply circuit. For example, the voltage value input from the first power supply to the monitored system obtained from the monitored system. The preset warning condition is a condition set based on the monitoring detection data and used to evaluate whether the obtained monitoring detection data indicates that the first power supply circuit is in the second fault state.

[0058] As an example, the control module 3 is connected to the monitored system and at least one second power supply circuit, and is used to collect the monitoring detection data corresponding to the monitored system. When the control module 3 detects that the monitoring detection data does not meet the preset warning condition, it controls all the second power supply circuits to be in an open state; when the control module 3 detects that the monitoring detection data meets the preset warning condition, it controls at least one second power supply circuit in the normal state to be in a conducting state.

[0059] In this example, the control module 3 can make at least one second power supply circuit in the normal state be in a conducting state before the first power supply circuit is in the second fault state, that is, in the first fault state, which can add an extra redundancy in addition to the detection and control of the first fault state, and further improve the stability of the low-voltage power supply system.

[0060] In one embodiment, the monitoring detection data includes a detected voltage value, and the detected voltage value is the voltage value input from the first power supply 1 to the monitored system; the preset warning condition is that the detected voltage value is not within the preset voltage threshold range.

[0061] As an example, the monitoring detection data can include a detected voltage value, and the detected voltage value is the voltage value input from the first power supply 1 to the monitored system. Correspondingly, the preset warning condition can be that the detected voltage value is not within the preset voltage threshold range. The preset voltage threshold range is set according to the voltage state of the first power supply 1 before entering the first fault state.

[0062] In one embodiment, as Figure 3 and Figure 4As shown in the figure, the control module 3 includes an intelligent driving system 33 and / or a vehicle control unit 32; in the intelligent driving system 33 and / or the vehicle control unit 32, at least one power input monitoring module is provided, and each power input monitoring module is used to connect to a monitored system for collecting monitoring detection data corresponding to the monitored system; the power input monitoring module is hard-wired to at least one second power supply circuit, and is used to open all second power supply circuits when the monitoring detection data does not meet the preset warning conditions, and to make at least one second power supply circuit in a normal state in a conducting state when the monitoring detection data meets the preset warning conditions.

[0063] As an example, both the intelligent driving system 33 and the vehicle control unit 32 can separately act as the control module 3 to execute the control process. At this time, in the intelligent driving system 33 and / or the vehicle control unit 32, at least one power input monitoring module is provided, and each power input monitoring module is used to connect to a monitored system for collecting monitoring detection data corresponding to the monitored system; the power input monitoring module is hard-wired to at least one second power supply circuit, for example, hard-wired to the MOS closing control module in a second power supply 2, and can open all connected second power supply circuits when the monitoring detection data does not meet the preset warning conditions, and can also output a control signal, such as a PWM signal, in the hard-wired connection to make at least one second power supply circuit in a normal state in a conducting state when the monitoring detection data meets the preset warning conditions.

[0064] In one embodiment, the control module 3 is used to alarm when all second power supply circuits fail.

[0065] As an example, the control module 3, such as the battery management system 34 or the power distribution box 31, can briefly connect and then disconnect each second power supply circuit when it detects that the current first power supply circuit is in a fault state. At this time, the control module 3 will detect each connected second power supply circuit. If it detects that all connected second power supply circuits are in a fault state, it will directly alarm; if it detects that some second power supply circuits are in a fault state and some are in a normal state, it will control to connect at least one second power supply circuit in a normal state according to the demand and alarm for the second power supply circuits in a fault state; if it detects that all second power supply circuits are in a normal state, it will control to connect at least one second power supply circuit according to the demand.

[0066] An embodiment of the present invention further provides a vehicle, including a low-voltage load and the low-voltage power supply system in the above embodiment.

[0067] As an example, the vehicle includes a low-voltage load and the low-voltage power supply system in the above embodiments. In the low-voltage power supply system, when the first power supply circuit is in a fault state, the control module 3 can change the second power supply circuit from an open state to a conducting state, and use the second power supply 2 to redundantly supply power to the low-voltage load, so as to ensure that the low-voltage load can still operate normally when the first power supply 1 fails. In this example, the second power supply 2 is only controlled to be connected for power supply in the fault state, which can reduce the working duration of the second power supply 2 and avoid the aging and failure of the second power supply 2 caused by long-term use. In this example, the control module 3 in the low-voltage power supply system may include one or more of a distribution box 31, a battery management system 34, a vehicle control unit 32, and an intelligent driving system 33 that are connected to the first power supply 1, the second power supply 2, and the low-voltage load through a power supply link and / or a communication link. The control module 3 can detect the fault state heterogeneously through the corresponding power supply link or communication link. When there are multiple different control modules 3, different control modules 3 can be in charge of controlling the second power supply circuit to be in a conducting state to achieve multi-node redundant control.

[0068] The above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A low-voltage power supply system for connecting low-voltage loads, characterized in that, It includes a first power supply, at least one second power supply, and a control module; A first power supply circuit is formed between the first power supply and the low-voltage load; A second power supply circuit is formed between each second power supply and the low-voltage load; The control module, connected to the first power supply circuit and at least one of the second power supply circuits, is used to detect the states of the first power supply circuit and the second power supply circuits. When the first power supply circuit is in a normal state, it controls all the second power supply circuits to be in an open state. When the first power supply circuit is in a fault state, it controls at least one of the second power supply circuits that is in a normal state to be in a conducting state.

2. The low-voltage power supply system according to claim 1, wherein The control module includes a distribution box; The first power supply is connected to the distribution box through a first power supply link, and the distribution box is connected to the low-voltage load through a second power supply link, forming the first power supply circuit; Each second power supply is connected to the distribution box through a third power supply link, and the distribution box is connected to the low-voltage load through the second power supply link, forming one of the second power supply circuits; The distribution box is used to collect distribution detection data, and the distribution detection data includes power detection data corresponding to the first power supply and power supply detection data corresponding to the first power supply link; The distribution box is used to determine that the first power supply circuit is in a normal state when the power detection data corresponding to the first power supply does not meet the power fault condition and the power supply detection data corresponding to the first power supply link does not meet the power supply fault condition; It is also used to determine that the first power supply circuit is in a fault state when the power detection data corresponding to the first power supply meets the power fault condition, or the power supply detection data corresponding to the first power supply link meets the power supply fault condition.

3. The low-voltage power supply system according to claim 2, characterized in that, The low-voltage power supply system further includes at least one of a vehicle control unit and an intelligent driving system; The distribution box is electrically connected to the vehicle control unit through a fourth power supply link, and / or the distribution box is communicatively connected to the vehicle control unit through a first communication link; The distribution box is electrically connected to the intelligent driving system through a fifth power supply link; The distribution detection data includes communication detection data corresponding to the first communication link, and power supply detection data corresponding to the first power supply link, the fourth power supply link, and the fifth power supply link; The distribution box is used to determine that the first power supply circuit is in a normal state when the power detection data corresponding to the first power supply does not meet the power fault condition, the communication detection data corresponding to the first communication link does not meet the communication fault condition, and the power supply detection data corresponding to the first power supply link, the fourth power supply link, and the fifth power supply link do not meet the power supply fault condition; It is also used to determine that the first power supply circuit is in a fault state when the power detection data corresponding to the first power supply meets the power fault condition, or the communication detection data corresponding to the first communication link meets the communication fault condition, or at least one of the power supply detection data corresponding to the first power supply link, the fourth power supply link, and the fifth power supply link meets the power supply fault condition.

4. The low-voltage power supply system according to claim 1, wherein The control module includes a battery management system; The battery management system is connected to the first power supply circuit and at least one of the second power supply circuits, and is configured to collect power management data. When the power management data does not meet the power management fault assessment conditions, it determines that the first power supply circuit is in a normal state; When the power management data meets the power management fault assessment conditions, it determines that the first power supply circuit is in a fault state.

5. The low-voltage power supply system according to claim 4, characterized in that, The low-voltage power supply system further includes a distribution box; The first power supply is connected to the distribution box through a first power supply link, and the distribution box is connected to the low-voltage load through a second power supply link, forming the first power supply circuit; Each second power supply is connected to the distribution box through a third power supply link, and the distribution box is connected to the low-voltage load through the second power supply link, forming one of the second power supply circuits; The battery management system is connected to at least one of the third power supply links and the distribution box; The power management data includes power detection data corresponding to the first power supply and interface detection data between the distribution box and the first power supply; The battery management system is configured to determine that the first power supply circuit is in a normal state when the power detection data corresponding to the first power supply does not meet the power fault conditions and the interface detection data between the distribution box and the first power supply does not meet the power supply fault conditions; It is further configured to determine that the first power supply circuit is in a fault state when the power detection data corresponding to the first power supply meets the power fault conditions or the interface detection data between the distribution box and the first power supply meets the power supply fault conditions.

6. The low-voltage power supply system according to claim 4, characterized in that, The low-voltage power supply system includes a distribution box and further includes at least one of a vehicle control unit and an intelligent driving system; The first power supply is connected to the distribution box through a first power supply link, the distribution box is connected to the low-voltage load through a second power supply link, the distribution box is connected to the vehicle control unit through a fourth power supply link, and the distribution box is connected to the intelligent driving system through a fifth power supply link, forming the first power supply circuit; Each second power supply is connected to the distribution box through a third power supply link, the distribution box is connected to the low-voltage load through the second power supply link, the distribution box is connected to the vehicle control unit through the fourth power supply link, and the distribution box is connected to the intelligent driving system through the fifth power supply link, forming the second power supply circuit; The battery management system is connected to at least one of the third power supply links and the distribution box; The battery management system is connected to the vehicle control unit through a second communication link; The power management data includes power detection data corresponding to the first power supply, interface detection data between the distribution box and at least one of the first power supply, low-voltage load, vehicle control unit, and intelligent driving system, and communication detection data corresponding to the second communication link; The battery management system is used to determine that the first power supply circuit is in a normal state when the power supply detection data corresponding to the first power supply does not meet the power supply fault condition, the communication detection data corresponding to the second communication link does not meet the communication fault condition, and the interface detection data between the distribution box and the first power supply, the low-voltage load, the vehicle control unit, and the intelligent driving system do not meet the power supply fault condition; It is also used to determine that the first power supply circuit is in a fault state when the power supply detection data corresponding to the first power supply meets the power supply fault condition, or the communication detection data corresponding to the second communication link meets the communication fault condition, or the interface detection data between the distribution box and at least one of the first power supply, the low-voltage load, the vehicle control unit, and the intelligent driving system meets the power supply fault condition.

7. The low-voltage power supply system according to claim 1, characterized in that, The control module includes the vehicle control unit and at least one of the distribution box and the battery management system; The first power supply is connected to the distribution box through a first power supply link, and the distribution box is connected to the low-voltage load through a second power supply link to form the first power supply circuit; Each second power supply is connected to the distribution box through a third power supply link, and the distribution box is connected to the low-voltage load through the second power supply link to form the second power supply circuit; The battery management system is connected to at least one of the third power supply links; The vehicle control unit is connected to the distribution box through a first communication link for obtaining the power distribution detection data collected by the distribution box, and / or the vehicle control unit is connected to the battery management system through a second communication link for obtaining the power management data collected by the battery management system; The vehicle control unit is used to determine that the first power supply circuit is in a normal state and control all the second power supply circuits to be in an open state when the power distribution detection data does not meet the power distribution fault evaluation condition and the power management data does not meet the power management fault evaluation condition; to determine that the first power supply circuit is in a fault state and control at least one of the second power supply circuits in a normal state to be in an open state when the power distribution detection data meets the power distribution fault evaluation condition or the power management data meets the power management fault evaluation condition.

8. The low-voltage power supply system according to claim 7, characterized in that, The control module further includes an intelligent driving system, and the vehicle control unit is connected to the intelligent driving system through a third communication link for collecting control unit detection data; The vehicle control unit is used to determine that the first power supply circuit is in a normal state and control all the second power supply circuits to be in an open state when the control unit detection data does not meet the control fault evaluation condition; to determine that the first power supply circuit is in a fault state and control at least one of the second power supply circuits in a normal state to be in a conducting state when the control unit detection data meets the control fault evaluation condition.

9. The low-voltage power supply system according to claim 8, wherein The control unit detection data includes the target instruction triggered by the intelligent driving system and the communication detection data corresponding to the third communication link; The control fault assessment conditions include that the target instruction triggered by the intelligent driving system is a backup power supply instruction for making the second power supply loop in a conducting state, and / or the communication detection data corresponding to the third communication link meets the communication fault condition.

10. The low-voltage power supply system according to claim 7 or 8, characterized in that, The control of making all the second power supply loops in an open state includes: The vehicle control unit outputs a second power-off signal to the power distribution box through the first communication link, so that the power distribution box controls all the third power supply links to be disconnected, making all the second power supply loops in an open state, and / or outputs a second power-off signal to the battery management system through the second communication link, so that the battery management system controls all the third power supply links to be disconnected, making all the second power supply loops in an open state; The control of making at least one of the second power supply loops in a normal state in a conducting state includes: Output a second power-on signal to the power distribution box through the first communication link, so that the power distribution box controls at least one of the third power supply links in a normal state to be conducted, making the second power supply loop in a conducting state, and / or output a second power-on signal to the battery management system through the second communication link, so that the battery management system controls at least one of the third power supply links in a normal state to be conducted, making the second power supply loop in a conducting state.

11. The low-voltage power supply system according to claim 1, characterized in that, The control module is connected to the monitored system and at least one of the second power supply loops, and is used for collecting the monitoring detection data corresponding to the monitored system, and making all the second power supply loops in an open state when the monitoring detection data does not meet the preset warning condition; When the monitoring detection data meets the preset warning condition, making at least one of the second power supply loops in a normal state in a conducting state.

12. The low-voltage power supply system according to claim 11, characterized in that: The monitoring detection data includes a detected voltage value, and the detected voltage value is the voltage value input from the first power supply to the monitored system; The preset warning condition is that the detected voltage value is not within the preset voltage threshold range.

13. The low-voltage power supply system according to claim 11, wherein The control module includes an intelligent driving system and / or a vehicle control unit; In the intelligent driving system and / or the vehicle control unit, there is at least one power input monitoring module, and each power input monitoring module is used to connect to a monitored system and collect the monitoring detection data corresponding to the monitored system; The power input monitoring module is hard-wired to at least one of the second power supply loops, and is used to make all the second power supply loops in an open state when the monitoring detection data does not meet the preset warning condition, and make at least one of the second power supply loops in a normal state in a conducting state when the monitoring detection data meets the preset warning condition.

14. The low-voltage power supply system according to claim 1, characterized in that, The control module is used to perform an alarm operation when all the second power supply loops are in a fault state.

15. A vehicle, characterized in that: It includes a low-voltage load and the low-voltage power supply system according to any one of claims 1-14.

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