Low-voltage power supply system, power supply management strategy and vehicle

Abstract

The invention discloses a low-voltage power supply system, a power supply management strategy and a vehicle. The low-voltage power supply system comprises a power battery, a voltage converter, a main storage battery, an auxiliary storage battery, a vehicle body controller, whole vehicle electric equipment and an on-off control assembly. The power battery is electrically connected with the main storage battery and the auxiliary storage battery at the same time through the voltage converter, the main storage battery is electrically connected with the vehicle body controller and the whole vehicle electric equipment at the same time, and the auxiliary storage battery is electrically connected with the vehicle body controller; the vehicle body controller can change the working state of the on-off control assembly. The power supply mode is flexible, power supply from the main storage battery to the whole vehicle electric equipment and the vehicle body controller can be stopped when the dormancy abnormal controller node exists, power supply from the auxiliary storage battery to the vehicle body controller can be reserved, and it is ensured that when the vehicle dormancy abnormal causes power shortage and the whole vehicle electric equipment is powered off, the vehicle body controller is powered off. And the vehicle body controller can normally receive a remote key signal.

Description

Technical Field

[0001] The invention relates to a vehicle power supply system, and in particular to a low-voltage power supply system, a power supply management strategy and a vehicle. Background Art

[0002] The power system of new energy vehicles consists of two core components: the power battery at the high-voltage end and the storage battery at the low-voltage end. Among them, the function of the storage battery system at the low-voltage end is to receive the charge from the power battery when the vehicle is working normally, and then convert this energy into low-voltage electricity suitable for various electrical equipment in the vehicle, providing stable power for equipment such as door locks, car networking, and lights. When the vehicle completes the driving task, the vehicle is powered off, and the entire vehicle network is dormant, if the on-board electrical equipment works abnormally, it may cause the battery power to be consumed faster. After the remaining battery power of the vehicle drops to the preset threshold, the vehicle starts the power battery according to the preset charging strategy, and controls the power battery to charge the storage battery. Frequent charging will cause the vehicle's power battery to lose power, and in severe cases, it may even cause the vehicle to be unable to start, and the door locks cannot be unlocked or locked by receiving the remote control key signal. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a low-voltage power supply system, a power management strategy and a vehicle, which have a flexible power supply mode and can stop the main battery from supplying power to the vehicle's electrical equipment and body controller when there is a dormant abnormal controller node, and can prevent the main and auxiliary batteries from running low due to the vehicle's large static power consumption, resulting in the vehicle being unable to be unlocked normally, and can retain the power supply from the auxiliary battery to the body controller, ensuring that after the vehicle's dormant abnormality causes power loss and the power is cut off to the vehicle's electrical equipment, the body controller can normally receive the remote control key signal and the vehicle can realize remote control unlocking and locking functions.

[0004] A low-voltage power supply system in the present invention comprises a power battery, a voltage converter, a main battery, a secondary battery, a body controller, a whole vehicle electrical equipment and an on-off control component; the power battery is electrically connected to the main battery and the secondary battery at the same time through the voltage converter, the main battery is electrically connected to the body controller and the whole vehicle electrical equipment at the same time, and the secondary battery is electrically connected to the body controller; The body controller can change the working state of the on-off control component to achieve the change of the on-off state between the voltage converter and the auxiliary battery, the on-off state between the main battery and the body controller, and the on-off state between the main battery and the vehicle electrical equipment.

[0005] Furthermore, the on-off control component includes a first relay and a second relay, and the body controller can control the on-off status of the first relay and the second relay; the low-voltage power supply system also includes a first power supply wiring harness and a second power supply wiring harness; the auxiliary battery, the first relay, the main battery and the second relay are connected in series in sequence through a low-voltage power supply wiring harness, the head end of the first power supply wiring harness is connected to the low-voltage power supply wiring harness between the first relay and the auxiliary battery, the head end of the second power supply wiring harness is connected to the low-voltage power supply wiring harness between the second relay and the electrical equipment of the whole vehicle, and the tail end of the first power supply wiring harness and the tail end of the second power supply wiring harness are both connected to the body controller.

[0006] Furthermore, the power battery is connected to the voltage converter via a high-voltage power supply harness, and the voltage converter is connected to a low-voltage power supply harness between the first relay and the main battery via a low-voltage power supply harness; the body controller is connected to the first relay and the second relay via a hard wire.

[0007] Further, the capacity of the sub-battery is smaller than the capacity of the main battery.

[0008] Furthermore, it also includes a vehicle controller, a gateway and a TBOX. The vehicle controller is communicatively connected to the power battery and the gateway at the same time. The voltage converter and the body controller are both communicatively connected to the gateway. The gateway is communicatively connected to the TBOX. The TBOX can send signals to the user end through the cloud.

[0009] Further, the vehicle body controller is configured as follows: When the vehicle is powered on and the vehicle network is awakened, the on-off control component is controlled to maintain a path between the voltage converter and the auxiliary battery, a path between the main battery and the vehicle body controller, and a path between the main battery and the vehicle electrical equipment; When the vehicle is powered off and the vehicle network is in a dormant state, and the main battery and / or the auxiliary battery meet the recharging conditions, the main battery and / or the auxiliary battery are recharged through the power battery and the voltage converter, and the number of recharges within a preset time period is recorded. If the number of recharges exceeds the preset number, the vehicle network is analyzed to see whether there is a dormant abnormal controller node; When the vehicle is powered off and the vehicle network is in a dormant state, and the body controller recognizes the existence of a dormant abnormal controller node, it controls the dormant abnormal controller node to be reset, and determines whether the reset success condition is met; if the reset success condition is met, the on-off control component is controlled to maintain a path between the voltage converter and the auxiliary battery, a path between the main battery and the body controller, and a path between the main battery and the electrical equipment of the whole vehicle; if the reset success condition is not met, the on-off control component is controlled to cut off the circuit between the voltage converter and the auxiliary battery, the circuit between the main battery and the body controller, and the circuit between the main battery and the electrical equipment of the whole vehicle; at this time, the body controller is powered by the auxiliary battery.

[0010] Further, when the vehicle is powered off and the vehicle network is in a dormant state, and the body controller identifies the existence of a dormant abnormal controller node, controlling the dormant abnormal controller node to reset, and determining whether a reset success condition is met includes: Acquire information of a dormant abnormal controller node that causes the entire vehicle network to be abnormal when the entire vehicle network is in a dormant state; Generate a reset request signal according to the information of the sleep-abnormal controller node, and send the reset request signal to the sleep-abnormal controller node; Receiving a reset state signal fed back by the sleep abnormal controller node; The vehicle network status is collected again to determine if the dormant abnormal controller node no longer exists, the reset success condition is determined to be met; if the dormant abnormal controller node is still identified to exist, the reset success condition is determined not to be met, then the TBOX is woken up, and information is sent to the user end through the cloud to prompt the vehicle abnormality.

[0011] A power management strategy in the present invention includes: When the vehicle is powered on and the vehicle network is awakened, the power battery and the voltage converter provide power to the main battery and / or the auxiliary battery, and the main battery provides power to the body controller and the electrical equipment of the vehicle; When the vehicle is powered off and the vehicle network is in a dormant state, and the main battery and / or the auxiliary battery meet the recharging conditions, the main battery and / or the auxiliary battery are recharged through the power battery and the voltage converter, and the number of recharges within a preset time period is recorded. If the number of recharges exceeds the preset number, the vehicle network is analyzed to see whether there is a dormant abnormal controller node; When the vehicle is powered off and the vehicle network is in a dormant state, and the body controller recognizes the existence of a dormant abnormal controller node, it controls the dormant abnormal controller node to be reset, and determines whether the reset success condition is met; if the reset success condition is met, the power battery and the voltage converter provide power to the main battery and / or the auxiliary battery, and the main battery provides power to the body controller and the electrical equipment of the whole vehicle; if the reset success condition is not met, the main battery does not provide power to the body controller and the electrical equipment of the whole vehicle, the body controller is powered by the auxiliary battery, and the power battery and the voltage converter do not provide power to the auxiliary battery.

[0012] Further, when the vehicle is powered off and the vehicle network is in a dormant state, and the body controller identifies the existence of a dormant abnormal controller node, controlling the dormant abnormal controller node to reset, and determining whether a reset success condition is met includes: The vehicle body controller obtains information of a dormant abnormal controller node that causes the entire vehicle network to be abnormal when the entire vehicle network is in a dormant state; Generate a reset request signal according to the information of the sleep-abnormal controller node, and send the reset request signal to the sleep-abnormal controller node; The vehicle body controller receives a reset state signal fed back by the sleep abnormality controller node; The body controller collects and determines the network status of the whole vehicle again. If the dormant abnormal controller node no longer exists, it is determined that the reset success condition is met; if the dormant abnormal controller node is still identified, it is determined that the reset success condition is not met. At this time, TBOX is woken up and information is sent to the user end through the cloud to prompt the vehicle abnormality.

[0013] A vehicle in the present invention includes the above-mentioned low-voltage power supply system or uses the above-mentioned power supply management strategy.

[0014] The beneficial effects of the present invention are: (1) The present invention makes the power supply mode of the low-voltage power supply system more flexible by providing a main battery, a secondary battery and an on-off control component. When the vehicle is powered off and the vehicle network is in a dormant state, the body controller identifies the existence of a dormant abnormal controller node and the dormant abnormal controller node is reset unsuccessfully, the main battery stops supplying power to the vehicle's electrical equipment and the body controller. At this time, after the vehicle door is unlocked / locked, the vehicle cannot realize other functions, such as car OTA, car networking, lighting and other functions, thereby preventing the main and secondary batteries from running out of power due to the large static power consumption of the vehicle, which in turn causes the vehicle to be unable to be unlocked normally, and preventing the battery from being deeply discharged and causing the battery life to decrease. In addition, since the power supply of the secondary battery to the body controller is retained, it is ensured that after the vehicle is dormant abnormally and the power is lost and the vehicle's electrical equipment is powered off, the body controller can normally receive the remote control key signal and realize the remote control unlocking and locking functions. The user does not need to connect an external device to open the door with the remote control key.

[0015] (2) The present invention provides a first power supply harness, a second power supply harness, a main battery and an auxiliary battery, so that the low-voltage power supply system is a dual power supply system. A total of two power supplies are used to supply power to the vehicle body controller. In the event of an abnormal vehicle condition, such as a collision causing one power supply to be cut off, the other power supply can still be supplied, thereby ensuring that the vehicle door can be unlocked normally and preventing the occupants from being locked in the vehicle.

[0016] (3) The present invention can control the reset of the dormant abnormal controller node when the vehicle is powered off and the vehicle network is in a dormant state and the body controller identifies the existence of a dormant abnormal controller node.

[0017] (4) The present invention can realize the interaction between the vehicle and the user end. When the reset of the dormant abnormal controller node fails, the TBOX can be awakened and a message can be sent to the user end through the cloud to prompt the vehicle abnormality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration: Figure 1 is a schematic diagram of the architecture of the low voltage power supply system of the present invention; Figure 2 It is a flowchart of the power management strategy of the present invention. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] like Figure 1As shown, a low-voltage power supply system in this embodiment includes a power battery, a voltage converter, a main battery, a secondary battery, a body controller, a whole vehicle electrical equipment and an on-off control component; the power battery is electrically connected to the main battery and the secondary battery at the same time through the voltage converter, the main battery is electrically connected to the body controller and the whole vehicle electrical equipment at the same time, and the secondary battery is electrically connected to the body controller; The body controller can change the working state of the on-off control component to achieve the change of the on-off state between the voltage converter and the auxiliary battery, the on-off state between the main battery and the body controller, and the on-off state between the main battery and the vehicle electrical equipment.

[0021] The body controller is BCM, the voltage converter is DCDC, the power battery is integrated with a battery management system (BMS), the main battery is integrated with a main low-voltage battery management system (main LBMS), and the auxiliary battery is integrated with a auxiliary low-voltage battery management system (auxiliary LBMS). The electrical equipment of the whole vehicle does not include the body controller. The electrical equipment of the whole vehicle includes automotive OTA (Over The Air technology), vehicle networking, lighting and other functional equipment.

[0022] By setting up the main battery, auxiliary battery and on-off control components, the power supply mode of the low-voltage power supply system is made more flexible. When the vehicle is powered on and the vehicle network is awakened, the power battery and the voltage converter provide power to the main battery and / or auxiliary battery, and the main battery provides power to the body controller and the vehicle's electrical equipment. When the vehicle is powered off and the vehicle network is in a dormant state, the body controller identifies the existence of a dormant abnormal controller node and the dormant abnormal controller node is reset unsuccessfully, the main battery stops supplying power to the vehicle's electrical equipment and the body controller. At this time, after the vehicle door is unlocked / locked, other functions such as car OTA, car networking, lighting and other functions cannot be realized, thereby preventing the main and auxiliary batteries from running out of power due to the large static power consumption of the vehicle, which in turn causes the vehicle to be unable to unlock normally, and preventing the battery from being deeply discharged and causing the battery life to decrease. Because the auxiliary battery is retained to supply power to the body controller, the body controller can receive the remote control key signal normally and realize the remote control unlocking and locking functions after the vehicle is abnormally dormant and runs out of power and the power is cut off to the entire vehicle's electrical equipment. The user does not need to power up external equipment to open the car door with the remote control key.

[0023] In this embodiment, the on-off control component includes a first relay and a second relay, and the body controller can control the on-off status of the first relay and the second relay; the low-voltage power supply system also includes a first power supply wiring harness and a second power supply wiring harness; the auxiliary battery, the first relay, the main battery and the second relay are connected in series in sequence through a low-voltage power supply wiring harness, the head end of the first power supply wiring harness is connected to the low-voltage power supply wiring harness between the first relay and the auxiliary battery, the head end of the second power supply wiring harness is connected to the low-voltage power supply wiring harness between the second relay and the electrical equipment of the whole vehicle, and the tail end of the first power supply wiring harness and the tail end of the second power supply wiring harness are both connected to the body controller.

[0024] By setting up the first power supply harness, the second power supply harness, the main battery and the auxiliary battery, the low-voltage power supply system is a dual power supply system. A total of two power supplies are used to supply power to the body controller. In abnormal vehicle conditions, such as a collision causing one power supply to be cut off, the other power supply can still be used to ensure that the vehicle doors can be unlocked normally, preventing occupants from being locked in the vehicle.

[0025] The first relay is used to cut off or connect the circuit between the voltage converter and the auxiliary battery, and the first relay is also used to cut off or connect the circuit between the main battery and the first power supply harness. The second relay is used to cut off or connect the circuit between the main battery and the second power supply harness, and the second relay is also used to cut off or connect the circuit between the main battery and the electrical equipment of the vehicle.

[0026] In this embodiment, the power battery is connected to the voltage converter through a high-voltage power supply harness, and the voltage converter is connected to the low-voltage power supply harness between the first relay and the main battery through a low-voltage power supply harness; the body controller is connected to the first relay and the second relay through a hard wire.

[0027] In this embodiment, the capacity of the auxiliary battery is smaller than that of the main battery. For example, the capacity of the main battery is 45Ah and the capacity of the auxiliary battery is 10Ah. By cutting off the power supply of the main battery under certain abnormal conditions, the auxiliary battery is retained to supply power to the vehicle body controller, so the impact on the auxiliary battery is greater than that on the main battery. Since the capacity of the auxiliary battery is small, the price of the auxiliary battery is lower than that of the main battery. When the battery needs to be replaced, the user spends less money to replace the auxiliary battery.

[0028] In this embodiment, a vehicle controller, a gateway and a TBOX are also included. The vehicle controller is connected to the power battery and the gateway at the same time. The voltage converter and the body controller are connected to the gateway. The gateway is connected to the TBOX. The TBOX can send signals to the user end through the cloud. The user end can be a mobile terminal bound to the user. The gateway is GW (Gateway), and the vehicle controller is VCU. The communication connection method can be connected through a CAN harness.

[0029] TBOX is used to realize vehicle network functions, upload vehicle charging information to the cloud, and realize interaction between vehicles and user terminals. When the reset of the dormant abnormal controller node fails, the TBOX can be awakened and information can be sent to the user terminal through the cloud to prompt the vehicle abnormality.

[0030] In this embodiment, the body controller is configured as follows: When the vehicle is powered on and the vehicle network is awakened, the on-off control component is controlled to maintain a path between the voltage converter and the auxiliary battery, a path between the main battery and the vehicle body controller, and a path between the main battery and the vehicle electrical equipment; When the vehicle is powered off and the vehicle network is in a dormant state, and the main battery and / or the auxiliary battery meet the recharging conditions, the main battery and / or the auxiliary battery are recharged through the power battery and the voltage converter, and the number of recharges within a preset time period is recorded. If the number of recharges exceeds the preset number, the vehicle network is analyzed to see whether there is a dormant abnormal controller node; When the vehicle is powered off and the vehicle network is in a dormant state, and the body controller recognizes the existence of a dormant abnormal controller node, it controls the dormant abnormal controller node to be reset, and determines whether the reset success condition is met; if the reset success condition is met, the on-off control component is controlled to maintain a path between the voltage converter and the auxiliary battery, a path between the main battery and the body controller, and a path between the main battery and the electrical equipment of the whole vehicle; if the reset success condition is not met, the on-off control component is controlled to cut off the circuit between the voltage converter and the auxiliary battery, the circuit between the main battery and the body controller, and the circuit between the main battery and the electrical equipment of the whole vehicle; at this time, the body controller is powered by the auxiliary battery.

[0031] Whether the main battery or / and the auxiliary battery meet the conditions for recharging is an existing technology. Take a certain car as an example. The main battery capacity is 45Ah, the auxiliary battery capacity is 10Ah, the dark current is 50mA in the normal sleep state of the vehicle, and the recharging thresholds set for the main battery and the auxiliary battery are both 50%. Then, when the vehicle is powered off and the entire vehicle network is in a sleep state, if the main low-voltage battery management system detects that the current remaining power value (SOC) of the main battery is less than 50%, or / and the auxiliary low-voltage battery management system detects that the current remaining power value (SOC) of the auxiliary battery is less than 50%, it is considered that the recharging conditions are met. The preset time period can be 12 hours, and the preset number of times can be 10 times. That is, if the number of charging times exceeds 10 times within 12 hours, analyze whether there is an abnormally dormant controller node in the entire vehicle network. The body controller collects and determines the reasons why the controllers of various electrical equipment do not go into sleep mode. When it is identified that the reason why a certain electrical equipment controller does not go into sleep mode is abnormal, it identifies the existence of an abnormally sleep controller node, and resets the abnormally sleep controller node under the premise that the vehicle allows the controller to be reset.

[0032] In this embodiment, when the vehicle is powered off and the vehicle network is in a dormant state, and the body controller identifies the existence of a dormant abnormal controller node, controlling the dormant abnormal controller node to reset, and determining whether the reset success condition is met includes: Acquire information of a dormant abnormal controller node that causes the entire vehicle network to be abnormal when the entire vehicle network is in a dormant state; Generate a reset request signal according to the information of the sleep-abnormal controller node, and send the reset request signal to the sleep-abnormal controller node; Receiving a reset state signal fed back by the sleep abnormal controller node; The vehicle network status is collected again to determine if the dormant abnormal controller node no longer exists, and the reset success condition is determined to be met; if the dormant abnormal controller node is still identified, the reset success condition is determined not to be met, and the TBOX is awakened at this time, and a message is sent to the user end through the cloud to prompt the vehicle abnormality. After the message is sent, the on-off control component is controlled to cut off the circuit between the main battery and the body controller and the circuit between the main battery and the vehicle electrical equipment.

[0033] like Figure 2 As shown, a power management strategy in this embodiment includes: When the vehicle is powered on and the vehicle network is awakened, the power battery and the voltage converter provide power to the main battery and / or the auxiliary battery, and the main battery provides power to the body controller and the electrical equipment of the vehicle; When the vehicle is powered off and the vehicle network is in a dormant state, and the main battery and / or the auxiliary battery meet the recharging conditions, the main battery and / or the auxiliary battery are recharged through the power battery and the voltage converter, and the number of recharges within a preset time period is recorded. If the number of recharges exceeds the preset number, the vehicle network is analyzed to see whether there is a dormant abnormal controller node; When the vehicle is powered off and the vehicle network is in a dormant state, and the body controller recognizes the existence of a dormant abnormal controller node, it controls the dormant abnormal controller node to be reset, and determines whether the reset success condition is met; if the reset success condition is met, the power battery and the voltage converter provide power to the main battery and / or the auxiliary battery, and the main battery provides power to the body controller and the electrical equipment of the whole vehicle; if the reset success condition is not met, the main battery does not provide power to the body controller and the electrical equipment of the whole vehicle, the body controller is powered by the auxiliary battery, and the power battery and the voltage converter do not provide power to the auxiliary battery.

[0034] In this embodiment, when the vehicle is powered off and the vehicle network is in a dormant state, and the body controller identifies the existence of a dormant abnormal controller node, controlling the dormant abnormal controller node to reset, and determining whether the reset success condition is met includes: The vehicle body controller obtains information of a dormant abnormal controller node that causes the entire vehicle network to be abnormal when the entire vehicle network is in a dormant state; Generate a reset request signal according to the information of the sleep-abnormal controller node, and send the reset request signal to the sleep-abnormal controller node; The vehicle body controller receives a reset state signal fed back by the sleep abnormality controller node; The body controller collects and determines the network status of the whole vehicle again. If the dormant abnormal controller node no longer exists, it is determined that the reset success condition is met; if the dormant abnormal controller node is still identified, it is determined that the reset success condition is not met. At this time, TBOX is woken up and information is sent to the user end through the cloud to prompt the vehicle abnormality.

[0035] A vehicle in this embodiment includes the above-mentioned low-voltage power supply system or uses the above-mentioned power supply management strategy.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A low voltage power supply system, characterized in that: It includes a power battery, a voltage converter, a main battery, a secondary battery, a body controller, a whole vehicle electrical equipment and an on-off control component; the power battery is electrically connected to the main battery and the secondary battery at the same time through the voltage converter, the main battery is electrically connected to the body controller and the whole vehicle electrical equipment at the same time, and the secondary battery is electrically connected to the body controller; The body controller can change the working state of the on-off control component to achieve the change of the on-off state between the voltage converter and the auxiliary battery, the on-off state between the main battery and the body controller, and the on-off state between the main battery and the vehicle electrical equipment.

2. The low voltage power supply system according to claim 1, characterized in that: The on-off control component includes a first relay and a second relay, and the body controller can control the on-off state of the first relay and the second relay; the low-voltage power supply system also includes a first power supply wiring harness and a second power supply wiring harness; The auxiliary battery, the first relay, the main battery and the second relay are connected in series in sequence through a low-voltage power supply harness. The head end of the first power supply harness is connected to the low-voltage power supply harness between the first relay and the auxiliary battery, the head end of the second power supply harness is connected to the low-voltage power supply harness between the second relay and the electrical equipment of the vehicle, and the tail end of the first power supply harness and the tail end of the second power supply harness are both connected to the body controller.

3. The low voltage power supply system according to claim 2, characterized in that: The power battery is connected to the voltage converter via a high-voltage power supply harness, and the voltage converter is connected to a low-voltage power supply harness between the first relay and the main battery via a low-voltage power supply harness; The vehicle body controller is connected to the first relay and the second relay via hard wires.

4. The low voltage power supply system according to claim 2, characterized in that: The sub-battery has a smaller capacity than the main battery.

5. The low voltage power supply system according to any one of claims 1 to 4, characterized in that: It also includes a vehicle controller, a gateway and a TBOX. The vehicle controller is communicatively connected to the power battery and the gateway at the same time. The voltage converter and the body controller are both communicatively connected to the gateway. The gateway is communicatively connected to the TBOX. The TBOX can send signals to the user end through the cloud.

6. The low voltage power supply system according to claim 5, characterized in that: The body controller is configured as follows: When the vehicle is powered on and the vehicle network is awakened, the on-off control component is controlled to maintain a path between the voltage converter and the auxiliary battery, a path between the main battery and the vehicle body controller, and a path between the main battery and the vehicle electrical equipment; When the vehicle is powered off and the vehicle network is in a dormant state, and the main battery and / or the auxiliary battery meet the recharging conditions, the main battery and / or the auxiliary battery are recharged through the power battery and the voltage converter, and the number of recharges within a preset time period is recorded. If the number of recharges exceeds the preset number, the vehicle network is analyzed to see whether there is a dormant abnormal controller node; When the vehicle is powered off and the vehicle network is in a dormant state, and the body controller recognizes the existence of a dormant abnormal controller node, it controls the dormant abnormal controller node to be reset, and determines whether the reset success condition is met; if the reset success condition is met, the on-off control component is controlled to maintain a path between the voltage converter and the auxiliary battery, a path between the main battery and the body controller, and a path between the main battery and the electrical equipment of the whole vehicle; if the reset success condition is not met, the on-off control component is controlled to cut off the circuit between the voltage converter and the auxiliary battery, the circuit between the main battery and the body controller, and the circuit between the main battery and the electrical equipment of the whole vehicle; at this time, the body controller is powered by the auxiliary battery.

7. The low voltage power supply system according to claim 6, characterized in that: When the vehicle is powered off and the vehicle network is in a dormant state, and the body controller identifies the existence of a dormant abnormal controller node, controlling the dormant abnormal controller node to reset, and determining whether a reset success condition is met includes: Acquire information of a dormant abnormal controller node that causes the entire vehicle network to be abnormal when the entire vehicle network is in a dormant state; Generate a reset request signal according to the information of the sleep-abnormal controller node, and send the reset request signal to the sleep-abnormal controller node; Receiving a reset state signal fed back by the sleep abnormal controller node; The vehicle network status is collected again to determine if the dormant abnormal controller node no longer exists, the reset success condition is determined to be met; if the dormant abnormal controller node is still identified to exist, the reset success condition is determined not to be met, then the TBOX is woken up, and information is sent to the user end through the cloud to prompt the vehicle abnormality.

8. A power management strategy, characterized in that: include: When the vehicle is powered on and the vehicle network is awakened, the power battery and the voltage converter provide power to the main battery and / or the auxiliary battery, and the main battery provides power to the body controller and the electrical equipment of the vehicle; When the vehicle is powered off and the vehicle network is in a dormant state, and the main battery and / or the auxiliary battery meet the recharging conditions, the main battery and / or the auxiliary battery are recharged through the power battery and the voltage converter, and the number of recharges within a preset time period is recorded. If the number of recharges exceeds the preset number, the vehicle network is analyzed to see whether there is a dormant abnormal controller node; When the vehicle is powered off and the vehicle network is in a dormant state, and the body controller recognizes the existence of a dormant abnormal controller node, it controls the dormant abnormal controller node to be reset, and determines whether the reset success condition is met; if the reset success condition is met, the power battery and the voltage converter provide power to the main battery and / or the auxiliary battery, and the main battery provides power to the body controller and the electrical equipment of the whole vehicle; if the reset success condition is not met, the main battery does not provide power to the body controller and the electrical equipment of the whole vehicle, the body controller is powered by the auxiliary battery, and the power battery and the voltage converter do not provide power to the auxiliary battery.

9. The power management strategy according to claim 8, characterized in that: When the vehicle is powered off and the vehicle network is in a dormant state, and the body controller identifies the existence of a dormant abnormal controller node, controlling the dormant abnormal controller node to reset, and determining whether a reset success condition is met includes: The vehicle body controller obtains information of a dormant abnormal controller node that causes the entire vehicle network to be abnormal when the entire vehicle network is in a dormant state; Generate a reset request signal according to the information of the sleep-abnormal controller node, and send the reset request signal to the sleep-abnormal controller node; The vehicle body controller receives a reset state signal fed back by the sleep abnormality controller node; The body controller collects and determines the network status of the whole vehicle again. If the dormant abnormal controller node no longer exists, it is determined that the reset success condition is met; if the dormant abnormal controller node is still identified, it is determined that the reset success condition is not met. At this time, TBOX is woken up and information is sent to the user end through the cloud to prompt the vehicle abnormality.

10. A vehicle, characterized in that: The invention comprises a low voltage power supply system as claimed in any one of claims 1 to 7 or uses a power management strategy as claimed in claim 9.

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