Vehicle low-voltage power supply system and control method

Abstract

The invention relates to the technical field of power supply control, and discloses a vehicle low-voltage power supply system and a control method. Fault detection is carried out on the DCDC converter, the main storage battery and the auxiliary storage battery, and a fault power supply loop and a normal power supply loop are determined; and switching a fault power supply loop to the normal power supply loop according to the current state. The power supply circuit comprises a power supply circuit of a main storage battery, a power supply circuit of an auxiliary storage battery and a power supply circuit of DCDC, and redundant design of the power supply circuits is formed. Whether the DCDC, the main storage battery or the auxiliary storage battery breaks down or not is detected through the detection module, the power supply loop is switched after the fault occurs, and therefore when a certain loop is powered off, other normal power supply loops can be used for maintaining vehicle operation, potential safety hazards are reduced, and property losses are reduced.

Description

Technical Field

[0001] The present application relates to the field of power supply control technology, and in particular to a vehicle low-voltage power supply system and control method. Background Art

[0002] The low-voltage power supply system of a vehicle is an important part of its electrical system, responsible for providing power to the vehicle's auxiliary equipment, such as lights, audio, air conditioning and power systems. When the low-voltage power supply system fails, it may cause some functions of the vehicle to fail, affecting the driving experience and safety.

[0003] In the prior art, the low-voltage power supply system mainly provides low-voltage power to the vehicle through a battery or a DC-to-DC converter (DCDC); if the battery or DCDC fails, some functional modules will lose power and stop working, and the vehicle will not be able to run, posing a safety hazard.

[0004] In view of this, this application is hereby filed. Summary of the invention

[0005] The present application provides a vehicle low-voltage power supply system and control method, which can ensure low-voltage power supply to the entire vehicle after a battery or DCDC fails, thereby improving safety.

[0006] In a first aspect, the present application provides a vehicle low-voltage power supply system, comprising: a main battery connected to a plurality of first functional modules of the vehicle to supply power to the plurality of first functional modules; an auxiliary battery connected to a plurality of second functional modules of the vehicle to supply power to the plurality of second functional modules; a DC-DC converter connected to the main battery and the auxiliary battery to charge the main battery and the auxiliary battery; The detection module is connected to the DCDC converter, the main battery and the auxiliary battery respectively, and is used to switch to a normal power supply circuit after detecting a fault in the power supply circuit of the DCDC converter, the power supply circuit of the main battery or the power supply circuit of the auxiliary battery.

[0007] In a second aspect, the present application provides a vehicle low-voltage power supply control method, applicable to the system described in any embodiment, the method comprising: Get the current status of the vehicle; Perform fault detection on the DCDC converter, main battery and auxiliary battery to determine the faulty power supply circuit and the normal power supply circuit; According to the current state, the faulty power supply circuit is switched to the normal power supply circuit.

[0008] The embodiments of the present application have the following technical effects: The vehicle low-voltage power supply system provided in the embodiment of the present application includes a power supply circuit of a main battery, a power supply circuit of an auxiliary battery and a power supply circuit of a DCDC, forming a redundant design of the power supply circuit. The detection module detects whether the DCDC, the main battery or the auxiliary battery fails, and switches the power supply circuit after the failure, so that when a certain circuit is powered off, other normal power supply circuits can be used to maintain vehicle operation, reduce safety hazards, and reduce property losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0010] Figure 1 It is a structural schematic diagram of a vehicle low-voltage power supply system provided in an embodiment of the present application; Figure 2 is a schematic diagram of a DCDC converter circuit breaker provided in an embodiment of the present application; Figure 3 is a schematic diagram of a main battery disconnection provided in an embodiment of the present application; Figure 4 It is a flow chart of a vehicle low-voltage power supply control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work belong to the scope of protection of the present application.

[0012] Example 1 The present application proposes a vehicle low-voltage power supply system, which is suitable for powering various functional modules in a vehicle. Figure 1 It is a structural schematic diagram of a vehicle low-voltage power supply system provided in an embodiment of the present application.

[0013] Combine the following Figure 1 , detailing the specific structure of the vehicle's low-voltage power supply system.

[0014] The vehicle's low-voltage power supply system includes a main battery, an auxiliary battery, a DC-DC converter and a detection module.

[0015] The main battery is a device used to convert chemical energy into electrical energy. It generates electrical energy through chemical reactions and can store electrical energy as chemical energy by charging when needed. The functions of the main battery include: 1. Starting the engine: When the engine starts, the main battery provides the necessary electrical energy to help the starter work normally, thereby starting the engine. 2. Auxiliary power supply: When the generator is overloaded, the main battery can assist the generator in supplying power to electrical equipment; when the generator does not generate electricity or the voltage is low, the main battery can also supply power to electrical equipment. 3. Protecting the electronic system: As a large-capacity capacitor, the main battery can absorb instantaneous high voltage in the circuit and protect the electronic system in the car. 4. Storing electrical energy: When the generator is running, excess electrical energy will be stored in the battery for use when needed.

[0016] In the present application, the main battery is connected to multiple first functional modules of the vehicle to supply power to the multiple first functional modules. Optionally, the multiple first functional modules include: a first electric power steering system EPS (Electric Power Steering), a first battery management system BMS (Battery Management System), a first door control module, a first body control module BCM (Body Control Module), a first vehicle control unit VCU (Vehicle Control Unit) and a first DCDC module.

[0017] Among them, the first EPS provides auxiliary torque through the motor to help the driver operate the steering wheel. The first BMS is used to intelligently manage and maintain the battery unit, monitor the status of the battery, prevent the battery from overcharging and over-discharging, and extend the battery life. The first door control module is an intelligent centralized controller for the door and the electrical components around the door, responsible for the management of glass lifting and anti-pinch functions, central door lock control, rearview mirror adjustment, door lights and other functions. The first BCM is responsible for monitoring and managing various electrical systems and equipment in the vehicle. These equipment and electrical systems include but are not limited to interior and exterior lighting, window and door control, vehicle locking system, anti-theft device, vehicle audio system and cockpit environment control. The first VCU is responsible for receiving signals from other control modules and performing corresponding operations. The VCU can control many functions of the vehicle, such as braking, steering, suspension, etc. It can also exchange data with other vehicle systems (such as navigation, audio and communication systems, etc.) to achieve more advanced vehicle control and automation functions. The first DCDC module is the first DC / DC converter module, which supplies power to low-voltage electrical appliances according to the actual power consumption of the vehicle electrical appliances and the charge and discharge balance of the main battery.

[0018] For example, for the convenience of description and distinction, the power supply interface of the main battery is referred to as the first A electrical interface. The main battery is connected to the main battery fuse box through the first A electrical interface. The main battery fuse box is connected to fuse box 1 and fuse box 2. Fuse box 1 is connected to the first door control module, the first BCM, the first VCU and the first DCDC module. Fuse box 2 is connected to the first EPS and the first BMS. It can be seen that the main battery is connected to multiple first functional modules through the first A electrical interface, the main battery fuse box, fuse box 1 and fuse box 2. The power supply circuit between the main battery and multiple first functional modules is called the first A electrical power supply circuit.

[0019] In this application, the main function of the fuse box is to act as an overcurrent protection switch to control the power consumption of the circuit. When the current in the circuit exceeds the predetermined value, the fuse in the fuse box will automatically blow and cut off the power supply to prevent the electrical equipment from being damaged due to overload. For example, when the vehicle is driving or parking, the power supply circuit will fail after the fuse box switches the power supply. This application can improve the safety of the circuit by setting a multi-level fuse box.

[0020] The vehicle low-voltage power supply system also includes an auxiliary battery, which has a similar structure and function to the main battery and is mainly used to start the engine, provide auxiliary power, protect the electronic system, and store electrical energy. In the present application, the auxiliary battery is connected to multiple second functional modules of the vehicle to supply power to the multiple second functional modules.

[0021] Optionally, the plurality of second functional modules include a second electric power steering system EPS, a second battery management system BMS, a second gating module, a second body control module BCM, a second vehicle controller VCU, a second DCDC module and a cooling fan. Among them, the function of the second EPS is the same as that of the first EPS, the function of the second BMS is the same as that of the first BMS, the function of the second gating module is the same as that of the first gating module, the function of the second BCM is the same as that of the first BCM, the function of the second VCU is the same as that of the first VCU, and the function of the second DCDC module is the same as that of the first DCDC module. The cooling fan is mainly responsible for helping to maintain temperature stability when the functional components are running, especially in a high temperature environment. For example, it helps the battery or engine dissipate heat to avoid high temperature failures.

[0022] Referring to the description of multiple first functional modules and multiple second functional modules, this embodiment has redundantly configured the main functional modules in the vehicle (such as BSM, EPS, door control module, BCM, VCU and DCDC module), so that after a power supply circuit fails, it can switch to another power supply circuit to supply power to these important functional modules to maintain normal operation of the vehicle.

[0023] Exemplarily, the auxiliary battery is connected to the auxiliary battery fuse box via the C electrical interface, the auxiliary battery fuse box is connected to the second BCM and fuse box 2, and fuse box 2 is connected to the second door control module, the cooling fan, the second EPS, the second BMS, the second VCU and the second DCDC module. It can be seen that the auxiliary battery is connected to multiple second functional modules via the C electrical interface, the auxiliary battery fuse box and the fuse box 2. The power supply circuit of the auxiliary battery and the multiple second functional modules is called the C electrical power supply circuit.

[0024] The DC-DC DCDC converter is used to convert the DC power output by the high-voltage battery into the DC power required by the low-voltage electronic system. In order to meet the needs of different voltage levels, new energy vehicles need to use a DCDC converter to convert the voltage of the high-voltage battery into a stable low-voltage DC power for various electronic devices in the vehicle, such as dashboards, audio, and lights, to ensure the normal operation of these devices. Even in the case of input voltage fluctuations, the DCDC converter can ensure the output of a stable DC voltage and provide a reliable power supply for the vehicle's electronic equipment. The DCDC converter reduces energy loss during the conversion process through efficient voltage conversion, thereby improving the energy efficiency of the entire vehicle.

[0025] In an embodiment of the present application, the DCDC converter is connected to the main battery to charge the main battery. Exemplarily, the DCDC converter is connected to the first A electrical interface of the main battery through the second A electrical interface to charge the main battery in a driving state. In order to ensure the safety of the DCDC converter and the main battery, the second A electrical interface is connected to the first A electrical interface through the main battery fuse box. When the main battery is fed with power, the detection module sends a charging instruction to the DCDC converter, closing the loop between the DCDC converter and the main battery, and the DCDC converter is connected to the first A electrical interface of the main battery through the second A electrical interface to charge the main battery.

[0026] The DCDC converter is connected to the auxiliary battery to charge the auxiliary battery. Exemplarily, the DCDC converter is connected to the C electrical interface of the auxiliary battery through the B electrical interface to charge the auxiliary battery in the driving state. In order to ensure the safety of the DCDC converter and the auxiliary battery, the B electrical interface is connected to the C electrical interface through the auxiliary battery fuse box. When the auxiliary battery is fed with power, the detection module sends a charging instruction to the DCDC converter, closing the loop between the DCDC converter and the auxiliary battery. The DCDC converter is connected to the C electrical interface of the auxiliary battery through the B electrical interface to charge the auxiliary battery.

[0027] It should be noted that when the capacity of the main battery or the auxiliary battery reaches a set value, the DCDC converter stops the charging operation.

[0028] In addition to supplying power to the main battery and the auxiliary battery, the DCDC converter is also connected to multiple first functional modules through the second A electrical interface to supply power to the multiple first functional modules. Exemplarily, the second A electrical interface is connected to the main battery fuse box, the main battery fuse box is connected to fuse box 1 and fuse box 2, and fuse box 1 is connected to the first door control module, the first BCM, the first VCU and the first DCDC module. Fuse box 2 is connected to the first EPS and the first BMS. It can be seen that the DCDC converter is connected to multiple first functional modules through the second A electrical interface, the main battery fuse box, fuse box 1 and fuse box 2. The power supply circuit between the DCDC converter and multiple first functional modules is called the second A electrical power supply circuit.

[0029] The DCDC converter is also connected to multiple second functional modules through the B electrical interface to supply power to the multiple second functional modules. Exemplarily, the B electrical interface is connected to the auxiliary battery fuse box, the auxiliary battery fuse box is connected to fuse box 2, and fuse box 2 is connected to the second door control module, the cooling fan, the second EPS, the second BMS, the second VCU and the second DCDC module; in addition, the auxiliary battery fuse box is connected to the second BCM. It can be seen that the DCDC converter is connected to multiple second functional modules through the B electrical interface, the auxiliary battery fuse box and the fuse box 2. The power supply circuit of the DCDC converter and multiple second functional modules is called the B electrical power supply circuit.

[0030] In an embodiment of the present application, the detection module is respectively connected to the DCDC converter, the main battery and the auxiliary battery, and is used to switch to the normal power supply circuit after detecting a fault in the power supply circuit of the DCDC converter (including the second A power supply circuit and the B power supply circuit), the power supply circuit of the main battery (i.e., the first A power supply circuit) or the power supply circuit of the auxiliary battery (i.e., the C power supply circuit).

[0031] Exemplarily, if any of the above power supply circuits fails, the power supply of the power supply circuit (main battery, auxiliary battery and DCDC converter) will send fault information to the vehicle network, and the fault information includes power failure information and the power supply circuit. The detection module is connected to the communication network. When the detection module reads the fault information, it parses the fault power supply circuit from the fault information; accordingly, based on the elimination method, other power supply circuits are considered to be normal power supply circuits. Optionally, the vehicle communication network includes but is not limited to CAN network, LIN network, vehicle Ethernet and vehicle bus network.

[0032] The detection module may be composed of software and / or hardware, may be packaged as a separate module, or may be integrated into any controller of the vehicle. Optionally, the detection module includes a central processing unit (CPU) or other forms of processing units with data processing capabilities and / or instruction execution capabilities, and may control the main battery, auxiliary battery, and other components in the DCDC converter to perform desired functions.

[0033] Optionally, the detection module is connected to the instrument to transmit the fault information to the instrument for display after detecting a fault in the DCDC converter, the main battery or the auxiliary battery. Exemplarily, the detection module encapsulates the fault information into a message that complies with the vehicle communication protocol, such as a CAN message. The message is sent to the instrument controller, and after the instrument controller parses the fault information from the message, the fault information is displayed on the screen in the form of text and / or symbols. Exemplarily, "The first A electrical circuit of the main battery is faulty, please repair it as soon as possible" is displayed on the instrument screen.

[0034] After the detection module determines the faulty power supply circuit and the normal power supply circuit, it sends a power supply instruction to the power supply of the normal power supply circuit to connect the normal power supply circuit, so that the normal power supply circuit replaces the faulty power supply circuit.

[0035] Taking into account the different installation positions of the main battery, DCDC converter and auxiliary battery, in order to facilitate the deployment of the detection module, the detection module of this embodiment includes a first sub-detection module and a second sub-detection module. The first sub-detection module is connected to the auxiliary battery and the DCDC converter respectively, and is used to detect whether the C power supply circuit between the auxiliary battery and multiple second functional modules fails, and detect whether the B power supply circuit between the DCDC converter and multiple second functional modules fails. The second sub-detection module is connected to the main battery and the DCDC converter respectively, and is used to detect whether the first A power supply circuit between the main battery and multiple first functional modules fails, and detect whether the second A power supply circuit between the DCDC converter and multiple first functional modules fails. The first sub-detection module and the second sub-detection module are both connected to the instrument.

[0036] Optionally, the first sub-detection module and the second sub-detection module are connected in communication, and can be connected through a separate wiring harness or communication channel, or can be connected through a circuit in a DCDC converter (such as Figure 1 The first sub-detection module transmits the fault information to the second sub-detection module, and the second sub-detection module determines the faulty power supply circuit and the normal power supply circuit, and sends a power supply instruction to the power supply of the normal power supply circuit; or the second sub-detection module transmits the fault information to the first sub-detection module, and the first sub-detection module determines the faulty power supply circuit and the normal power supply circuit, and sends a power supply instruction to the power supply of the normal power supply circuit.

[0037] Optionally, the detection module includes a first switching unit, which is used to: if the current state of the vehicle is the driving state, the second A power supply circuit of the DCDC converter and the multiple first functional modules fails, and the B power supply circuit of the DCDC converter and the multiple second functional modules fails, switch to the first A power supply circuit of the main battery and the multiple first functional modules, or switch to the C power supply circuit of the auxiliary battery and the multiple second functional modules; if the current state of the vehicle is the driving state, the C power supply circuit, the second A power supply circuit and the B power supply circuit all fail, switch to the first A power supply circuit; if the current state of the vehicle is the driving state, the first A power supply circuit, the second A power supply circuit and the B power supply circuit all fail, switch to the C power supply circuit. The detection module includes a second switching unit, which is used to: if the current state of the vehicle is the parking state, the first A power supply circuit of the main battery and the multiple first functional modules fails, switch to the C power supply circuit of the auxiliary battery and the multiple second functional modules; if the current state of the vehicle is the parking state, the C power supply circuit fails, and switch to the first A power supply circuit.

[0038] The first case: the current state of the vehicle is driving state.

[0039] 1. See Figure 2 , the DCDC converter and the second A power supply circuit of the multiple first functional modules fail, and the DCDC converter and the B power supply circuit of the multiple second functional modules fail, then the first switching unit sends a power supply instruction to the main battery to switch to the first A power supply circuit of the main battery and the multiple first functional modules, or sends a power supply instruction to the auxiliary battery to switch to the C power supply circuit of the auxiliary battery and the multiple second functional modules. Optionally, if the power of the main battery is greater than the power of the auxiliary battery, it will be switched to the first A power supply circuit first. When the power of the main battery drops to the set lower limit, it will switch to the C power supply circuit and be powered by the auxiliary battery. In this embodiment, when the DCDC converter cannot supply power, the main battery and / or the auxiliary battery are involved in the vehicle power supply circuit, which can extend the time of powering the vehicle for short-term emergency driving (i.e., emergency parking or moving the vehicle to wait for rescue).

[0040] 2. If the C power supply circuit, the second A power supply circuit and the B power supply circuit all fail, the first switching unit sends a power supply instruction to the main battery to switch to the first A power supply circuit. In this embodiment, when the vehicle is driving, if the DCDC converter and the auxiliary battery of the vehicle cannot supply power, the main battery is used for short-term emergency driving.

[0041] 3. If the first A power supply circuit, the second A power supply circuit and the B power supply circuit all fail, the first switching unit sends a power supply instruction to the auxiliary battery to switch to the C power supply circuit. In this embodiment, when the vehicle is driving, if the DCDC converter and the main battery of the vehicle cannot supply power, the auxiliary battery is used for emergency driving.

[0042] In some cases, the vehicle has an unavoidable accident, the main battery fuse box is damaged by collision, and the first A power supply circuit, the second A power supply circuit, and the B power supply circuit are all powered off; the second BCM can be powered by the auxiliary battery fuse box, the second BCM can work normally, and the lower-level actuators (such as door lock actuators, etc.) have enough time to complete the unlocking process, and the door can be opened normally, providing an effective rescue channel for the occupants and external rescue.

[0043] The second situation: the current state of the vehicle is the parking state. In the parking state, the DCDC converter cannot supply power to the main battery and the auxiliary battery, and it is assumed that the second A power supply circuit between the DCDC converter and the multiple first functional modules fails, and the B power supply circuit between the DCDC converter and the multiple second functional modules fails. The DCDC converter also cannot supply power to the multiple second functional modules and the multiple first functional modules.

[0044] 1. See Figure 3 , the first A power supply circuit between the battery and the plurality of first functional modules fails, the second switching unit sends a power supply instruction to the auxiliary battery to switch to the C power supply circuit between the auxiliary battery and the plurality of second functional modules. In this embodiment, in the parking state, the auxiliary battery can be used as a starting power source to start the entire vehicle for emergency driving.

[0045] 2. If the C power supply circuit fails, the second switching unit sends a power supply instruction to the main battery to switch to the first A power supply circuit. In this embodiment, in the parking state, the main battery acts as a starting power source to start the entire vehicle. The detection module sends a fault instruction to the instrument to remind the owner to check and repair the vehicle.

[0046] It should be noted that when the vehicle is in normal condition, each functional module is powered by a dual power supply of DCDC converter and main battery; the auxiliary battery does not need to be involved in the power supply of the entire vehicle.

[0047] Optionally, in order to effectively avoid collisions and improve vehicle safety, the main battery and DCDC converter are installed under the rear of the vehicle, and the auxiliary battery is installed under the seat. Exemplarily, the main battery and DCDC converter are installed under the luggage compartment at the rear of the vehicle; the auxiliary battery is installed under the second row of carpets behind the main driver.

[0048] The vehicle low-voltage power supply system provided in the embodiment of the present application includes a power supply circuit of a main battery, a power supply circuit of an auxiliary battery and a power supply circuit of a DCDC, forming a redundant design of the power supply circuit. The detection module detects whether the DCDC, the main battery or the auxiliary battery fails, and switches the power supply circuit after the failure, so that when a certain circuit is powered off, other normal power supply circuits can be used to maintain vehicle operation, reduce safety hazards, and reduce property losses.

[0049] The embodiment of the present application also provides a vehicle low-voltage power supply control method, which is applicable to the case of low-voltage power supply control in various vehicle states and is applied to the vehicle low-voltage power supply system provided by the above embodiments. The method provided by this embodiment is executed by the detection module in the above embodiments.

[0050] Figure 4 is a flow chart of a vehicle low-voltage power supply control method provided in an embodiment of the present application. Figure 4 , the method provided in this embodiment includes the following operations: S110: Obtain the current state of the vehicle.

[0051] The current state of the vehicle is obtained through the vehicle's sensors, such as the vehicle speed sensor and gear position sensor to collect vehicle speed and gear position information. Based on the vehicle speed and gear position information, it is determined whether the vehicle is in a driving state or a parking state.

[0052] Optionally, each sensor may be connected to the detection module via a separate wiring harness or communication channel, or may be connected to the detection module via an intermediate controller (eg, a zone controller).

[0053] S120: Perform fault detection on the DCDC converter, the main battery and the auxiliary battery to determine a faulty power supply circuit and a normal power supply circuit.

[0054] The detection module periodically scans the fault information in the vehicle network, and the specific period value is not limited in this embodiment. After reading the fault information, the detection module parses the faulty power supply circuit from the fault information and determines the remaining power supply circuits as normal power supply circuits.

[0055] S130: Switch the faulty power supply circuit to the normal power supply circuit according to the current state.

[0056] Compared with the prior art, the beneficial effect of the embodiment of the present application is that: the detection module detects whether the power supply circuit fails. When one of the circuits fails, it can switch to the normal power supply circuit, the functional module can continue to work, the vehicle will not lose power immediately, and the safety hazard of vehicle use is reduced. This embodiment provides safer vehicle use protection by adding auxiliary batteries and main batteries. In an emergency, the vehicle can be moved to a safe area by relying on the main battery and / or auxiliary battery, reducing safety hazards and reducing property losses.

[0057] It should be noted that the terms used in this application are only for describing specific embodiments, rather than limiting the scope of this application. As shown in the specification of this application, unless the context clearly indicates an exception, the words "one", "a", "a kind of" and / or "the" do not specifically refer to the singular, but may also include the plural. The terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method or device. In the absence of more restrictions, the elements defined by the sentence "include one..." do not exclude the presence of other identical elements in the process, method or device including the elements.

[0058] It should also be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present application.

Claims

1. A vehicle low-voltage power supply system, characterized in that: include: a main battery connected to a plurality of first functional modules of the vehicle to supply power to the plurality of first functional modules; an auxiliary battery connected to a plurality of second functional modules of the vehicle to supply power to the plurality of second functional modules; a DC-DC converter connected to the main battery and the auxiliary battery to charge the main battery and the auxiliary battery; The detection module is connected to the DCDC converter, the main battery and the auxiliary battery respectively, and is used to switch to a normal power supply circuit after detecting a fault in the power supply circuit of the DCDC converter, the power supply circuit of the main battery or the power supply circuit of the auxiliary battery.

2. The system according to claim 1, characterized in that The plurality of first functional modules include: a first electric power steering system EPS, a first battery management system BMS, a first door control module, a first body control module BCM, a first vehicle controller VCU and a first DCDC module; The multiple second functional modules include: a second electric power steering system EPS, a second battery management system BMS, a second door control module, a second body control module BCM, a second vehicle controller VCU, a second DCDC module and a cooling fan.

3. The system according to claim 1, characterized in that The DCDC converter is connected to the plurality of second functional modules via the B electrical interface to supply power to the plurality of second functional modules; The DCDC converter is connected to the C electrical interface of the auxiliary battery via the B electrical interface.

4. The system according to claim 1, characterized in that The DCDC converter is connected to the plurality of first functional modules via a second A electrical interface to supply power to the plurality of first functional modules; The DCDC converter is connected to the first A electrical interface of the main battery through the second A electrical interface.

5. The system according to claim 1, characterized in that The detection module is connected to the instrument and is used to transmit fault information to the instrument for display after detecting a fault in the DCDC converter, the main battery or the auxiliary battery.

6. The system according to claim 1, characterized in that The detection module includes a first sub-detection module and a second sub-detection module; The first sub-detection module is used to detect whether a C electrical power supply circuit between the auxiliary battery and the plurality of second functional modules fails, and detect whether a B electrical power supply circuit between the DCDC converter and the plurality of second functional modules fails; The second sub-detection module is used to detect whether a first A power supply circuit between the main battery and multiple first functional modules fails, and detect whether a second A power supply circuit between the DCDC converter and multiple first functional modules fails.

7. The system according to claim 1, characterized in that The detection module includes a first switching unit, configured to: If the current state of the vehicle is the driving state, the second A power supply circuit of the DCDC converter and the plurality of first functional modules fails, and the B power supply circuit of the DCDC converter and the plurality of second functional modules fails, switching to the first A power supply circuit of the main battery and the plurality of first functional modules, or switching to the C power supply circuit of the auxiliary battery and the plurality of second functional modules; If the current state of the vehicle is driving state, the C power supply circuit, the second A power supply circuit and the B power supply circuit all fail, and the first A power supply circuit is switched; If the current state of the vehicle is the driving state, the first A electrical power supply circuit, the second A electrical power supply circuit and the B electrical power supply circuit all fail, and the power supply circuit is switched to the C electrical power supply circuit.

8. The system according to claim 1, characterized in that The detection module includes a second switching unit, configured to: If the current state of the vehicle is the parking state, a first A power supply circuit between the main battery and the plurality of first functional modules fails, and the power supply circuit is switched to a C power supply circuit between the auxiliary battery and the plurality of second functional modules; If the current state of the vehicle is the parking state, the C electrical power supply circuit fails and switches to the first A electrical power supply circuit.

9. The system according to claim 1, characterized in that The main battery and the DCDC converter are installed under the rear of the vehicle, and the auxiliary battery is installed under the seat.

10. A vehicle low-voltage power supply control method, characterized in that: The system according to any one of claims 1 to 9 is applicable, wherein the method comprises: Get the current status of the vehicle; Perform fault detection on the DCDC converter, main battery and auxiliary battery to determine the faulty power supply circuit and the normal power supply circuit; According to the current state, the faulty power supply circuit is switched to the normal power supply circuit.

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