Fault detection device of low-voltage power distribution system, vehicle and method

Abstract

The invention particularly relates to a fault detection device of a low-voltage power distribution system, a vehicle and a method, the fault detection device comprises an acquisition assembly, a switch assembly and a control assembly, a plurality of acquisition parts of the acquisition assembly are respectively arranged on a branch circuit corresponding to a first power supply assembly, a branch circuit corresponding to a second power supply assembly and a branch circuit corresponding to each load of the low-voltage power distribution system; the acquisition module is used for acquiring first electric heating parameters, second electric heating parameters and electric heating parameters of each load; a plurality of switch pieces of the switch assembly are arranged on a branch circuit corresponding to the first power supply assembly, a branch circuit corresponding to the second power supply assembly and a branch circuit corresponding to each load in a one-to-one correspondence manner; the control assembly is connected with the multiple acquisition pieces, determines a target switch piece according to the electric heating parameters, and sends a disconnection instruction to the corresponding target acquisition piece, so that the target acquisition piece disconnects the target switch piece based on the disconnection instruction. Therefore, the problem that fault detection of the low-voltage power distribution system of the whole vehicle is limited in the prior art is solved, and the safety of the low-voltage power distribution system of the whole vehicle is improved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, and particularly relates to a fault detection device, a vehicle and a method for a low-voltage power distribution system. Background Art

[0002] In the related art, the low-voltage power distribution system usually uses fuses of the thermal fuse type to protect the circuit (as Figure 1 shown). When a short circuit or overcurrent fault occurs in the power distribution system, that is, when the current exceeds the rated value of the fuse and lasts for a period of time, the metal part inside the fuse melts, thereby protecting the circuit.

[0003] However, the fault detection device for the low-voltage power distribution system of the whole vehicle in the related art only has the protection ability against overcurrent or short circuit, and cannot detect and protect when faults such as too low supply voltage, overvoltage or local overheating of the circuit occur, which urgently needs to be solved. Summary of the Invention

[0004] The present application provides a fault detection device, a vehicle and a method for a low-voltage power distribution system to solve problems such as the limited fault detection of the low-voltage power distribution system of the whole vehicle in the related art, and improve the safety of the low-voltage power distribution system of the whole vehicle.

[0005] The first aspect of the present application provides a fault detection device for a low-voltage power distribution system, including: a collection component, a switch component and a control component, wherein,

[0006] The collection component includes a plurality of collection elements, and the plurality of collection elements are respectively arranged on the branches corresponding to the first power supply component of the low-voltage power distribution system, the branches corresponding to the second power supply component of the low-voltage power distribution system, and the branches corresponding to each load, and are used for collecting the first electrothermal parameter of the first power supply component, the second electrothermal parameter of the second power supply component, and the electrothermal parameter of each load;

[0007] The switch component includes a plurality of switch elements, and the plurality of switch elements are respectively arranged on the branches corresponding to the first power supply component of the low-voltage power distribution system, the branches corresponding to the second power supply component of the low-voltage power distribution system, and the branches corresponding to each load, and the plurality of switch elements and the plurality of collection elements are arranged in one-to-one correspondence;

[0008] A control component, the control component is respectively connected to the plurality of collection elements, and the control component determines a target switch element from the plurality of switch elements according to the first electrothermal parameter, the second electrothermal parameter, and the electrothermal parameter of each load, and sends a disconnection instruction to the target collection element corresponding to the target switch element, so that the target collection element disconnects the target switch element based on the disconnection instruction.

[0009] Optionally, each acquisition component includes: a first to a third resistor, a capacitor, and a processing unit, where

[0010] a first resistor, one end of the first resistor is connected to the low-voltage power distribution system, and the other end of the first resistor is connected to the switch assembly;

[0011] a second resistor, one end of the second resistor is connected to the connection node between the first resistor and the switch assembly, and the other end of the second resistor is connected to the third resistor;

[0012] one end of the capacitor is respectively connected to one end of the first resistor and the first end of the processing unit, and the other end of the capacitor is connected to the ground node;

[0013] the second end of the processing unit is connected to one end of the first resistor, the third end of the processing unit is connected to the other end of the first resistor, the fourth end of the processing unit is connected to the connection node between the second resistor and the third resistor, the fifth end of the processing unit is connected to the other end of the third resistor, the control end of the processing unit is connected to the corresponding switch, and the ground end of the processing unit is connected to the ground node, for acquiring the voltage at one end of the first resistor, the voltage at the other end of the first resistor, and the voltage at the connection node between the second resistor and the third resistor.

[0014] Optionally, the first electrothermal parameter, the second electrothermal parameter, and the electrothermal parameter of each load all include the line temperature, where the line temperature is obtained from the voltage at the connection node between the second resistor and the third resistor.

[0015] Optionally, the control assembly includes:

[0016] a first control unit, configured to perform system warning reminder when the first electrothermal parameter meets the first preset warning condition, and / or the second electrothermal parameter meets the second preset warning condition, and / or the electrothermal parameter of any load meets the third preset warning condition;

[0017] a second control unit, configured to perform system fault reminder when the first electrothermal parameter meets the first preset fault condition, and / or the second electrothermal parameter meets the second preset fault condition, and / or the electrothermal parameter of the load meets the third preset fault condition, and based on the electrothermal parameter that meets the preset fault condition, determine the target switch from the multiple switches and send a disconnection instruction to the target acquisition component corresponding to the target switch, so that the target acquisition component disconnects the target switch based on the disconnection instruction.

[0018] Optionally, the second power supply component is a storage battery, and the second electrothermal parameter includes the state of charge of the storage battery, where the state of charge of the storage battery is:

[0019]

[0020] where SOC1 is the initial SOC estimated for the storage battery, and I is the current value at the terminal of the storage battery collected in real time.

[0021] Optionally, the system warning reminder includes at least one of overcurrent warning reminder, undervoltage warning reminder, overvoltage warning reminder, overtemperature warning reminder, and low SOC warning reminder;

[0022] The system fault reminder includes at least one of overcurrent fault reminder, undervoltage fault reminder, overvoltage fault reminder, overtemperature fault reminder, and short - circuit fault reminder.

[0023] Optionally, the fault detection device of the low - voltage power distribution system further includes:

[0024] A communication component, which is connected to the control component and is used to connect the real - time information interaction between the control component and an external system.

[0025] Optionally, the multiple switching elements are all MOS transistors.

[0026] An embodiment of the second aspect of the present application provides a vehicle, which includes the fault detection device of the above - mentioned low - voltage power distribution system.

[0027] An embodiment of the third aspect of the present application provides a method for detecting faults in a low - voltage power distribution system, including the following steps:

[0028] Collect the first electrothermal parameter of the first power supply component, the second electrothermal parameter of the second power supply component, and the electrothermal parameter of each load;

[0029] Determine a target switching element from the multiple switching elements according to the first electrothermal parameter, the second electrothermal parameter, and the electrothermal parameter of each load;

[0030] Send a disconnection instruction to the target acquisition component corresponding to the target switching element, so that the target acquisition component disconnects the target switching element based on the disconnection instruction.

[0031] Thus, after the first electrothermal parameter of the first power supply component, the second electrothermal parameter of the second power supply component, and the electrothermal parameter of each load are collected in the embodiments of the present application, the target switch component is determined from a plurality of switch components according to the first electrothermal parameter, the second electrothermal parameter, and the electrothermal parameter of each load, and then a disconnection instruction is sent to the target acquisition component corresponding to the target switch component, so that the target acquisition component disconnects the target switch component based on the disconnection instruction. Thus, the problems such as the limited fault detection of the vehicle low-voltage power distribution system in the related art are solved, and the safety of the vehicle low-voltage power distribution system is improved.

[0032] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings

[0033] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of the embodiments in conjunction with the drawings, where:

[0034] Figure 1 is a schematic circuit diagram of a fault detection device for a low-voltage power distribution system in the related art;

[0035] Figure 2 is a block diagram of a fault detection device for a low-voltage power distribution system according to an embodiment of the present application;

[0036] Figure 3 is a schematic circuit diagram of a fault detection device for a low-voltage power distribution system according to an embodiment of the present application;

[0037] Figure 4 is a flowchart of a fault detection method for a low-voltage power distribution system according to an embodiment of the present application;

[0038] Figure 5 is a flowchart of a fault detection method for a low-voltage power distribution system according to an embodiment of the present application. Detailed Embodiments

[0039] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application.

[0040] The fault detection device, vehicle, and method for a low-voltage power distribution system according to embodiments of the present application will be described below with reference to the accompanying drawings. In view of the problem that the fault detection of the vehicle's low-voltage power distribution system in the related art mentioned in the above background art is relatively limited, the present application provides a fault detection device for a low-voltage power distribution system. Among them, a plurality of acquisition components are respectively arranged on the branches corresponding to the first power supply component, the branches corresponding to the second power supply component, and the branches corresponding to each load of the low-voltage power distribution system, and are used to acquire the first electrothermal parameter, the second electrothermal parameter, and the electrothermal parameter of each load; the switch component includes a plurality of switch elements, which are arranged one by one on the branches corresponding to the first power supply component, the branches corresponding to the second power supply component, and the branches corresponding to each load; the control component is respectively connected to the plurality of acquisition components, determines the target switch element according to the electrothermal parameter, and sends a disconnection instruction to the corresponding target acquisition component, so that it disconnects the target switch element based on the disconnection instruction. Thereby, problems such as the relatively limited fault detection of the vehicle's low-voltage power distribution system in the related art are solved, and the safety of the vehicle's low-voltage power distribution system is improved.

[0041] Specifically, Figure 2 is a block diagram of a fault detection device for a low-voltage power distribution system provided by an embodiment of the present application.

[0042] As Figure 2 shown, the fault detection device 10 of the low-voltage power distribution system includes: an acquisition component 100, a switch component 200, and a control component 300.

[0043] Among them, the acquisition component 100 includes a plurality of acquisition components, and the plurality of acquisition components are respectively arranged on the branches corresponding to the first power supply component, the branches corresponding to the second power supply component, and the branches corresponding to each load of the low-voltage power distribution system, and are used to acquire the first electrothermal parameter of the first power supply component, the second electrothermal parameter of the second power supply component, and the electrothermal parameter of each load; the switch component 200 includes a plurality of switch elements, and the plurality of switch elements are respectively arranged on the branches corresponding to the first power supply component, the branches corresponding to the second power supply component, and the branches corresponding to each load of the low-voltage power distribution system, and the plurality of switch elements and the plurality of acquisition components are arranged in one-to-one correspondence; the control component 300, the control component 300 is respectively connected to the plurality of acquisition components, and the control component 300 determines the target switch element from the plurality of switch elements according to the first electrothermal parameter, the second electrothermal parameter, and the electrothermal parameter of each load, and sends a disconnection instruction to the target acquisition component corresponding to the target switch element, so that the target acquisition component disconnects the target switch element based on the disconnection instruction.

[0044] Specifically, as Figure 3 shown, Figure 3Schematic diagram of the circuit principle of a fault detection device 10 for a low-voltage power distribution system provided according to an embodiment of the present application. Among them, the multiple acquisition components 100 can be acquisition component 101, acquisition component 102, acquisition component 103, ……, acquisition component 10N. The acquisition component 101, acquisition component 102, acquisition component 103, ……, acquisition component 10N can all be composed of a processing unit (such as an electronic fuse chip), a resistor, and a capacitor. The switch component 200 can be a MOS transistor, and the control component 300 can be a main control chip.

[0045] First, in combination with the attached Figure 3 The multiple acquisition components 100 of the embodiment of the present application will be introduced in detail below.

[0046] Optionally, in some embodiments, each acquisition component includes: a first to third resistor, a capacitor, and a processing unit. Among them, for the first resistor, one end of the first resistor is connected to the low-voltage power distribution system, and the other end of the first resistor is connected to the switch component 200; for the second resistor, one end of the second resistor is connected to the connection node between the first resistor and the switch component 200, and the other end of the second resistor is connected to the third resistor; one end of the capacitor is respectively connected to one end of the first resistor and the first end of the processing unit, and the other end of the capacitor is connected to the grounding node; the second end of the processing unit is connected to one end of the first resistor, the third end of the processing unit is connected to the other end of the first resistor, the fourth end of the processing unit is connected to the connection node between the second resistor and the third resistor, the fifth end of the processing unit is connected to the other end of the third resistor, the control end of the processing unit is connected to the corresponding switch device, and the grounding end of the processing unit is connected to the grounding node, and is used to acquire the voltage at one end of the first resistor, the voltage at the other end of the first resistor, and the voltage at the connection node between the second resistor and the third resistor.

[0047] Optionally, in some embodiments, the first electro-thermal parameter, the second electro-thermal parameter, and the electro-thermal parameter of each load all include the line temperature, where the line temperature is obtained from the voltage at the connection node between the second resistor and the third resistor.

[0048] Specifically, in combination with the following Figure 3A specific embodiment is introduced. For example, the acquisition component 101 includes a first resistor R1, a second resistor R2, a third resistor R3, and a processing unit (i.e., the electronic fuse chip 1011). Among them, the voltage V1 is the node voltage between the first resistor R1 and the DCDC converter. The second resistor R2 is a thermistor. The first resistor R1 and the second resistor R2 form a voltage division circuit, and the voltage V2 is the node voltage between the first resistor R1 and the second resistor R2. The voltage V3 is the node voltage between the second resistor R2 and the third resistor R3. This voltage reflects the resistance value change of the thermistor R2. Using a preset formula or look-up table, the temperature change at this position can be obtained from the node voltage. When a fault occurs in the system, by analyzing the line temperature data, the location where the fault occurs can be located, and corresponding measures can be taken. The electronic fuse chip 1011 is used to detect the output current and output voltage of the DCDC converter.

[0049] Specifically, the control component 300 communicates with the electronic fuse chip corresponding to each acquisition component (such as the main control chip communicates with the electronic fuse chip 1011), so as to control the turn-off and turn-on of the corresponding MOS transistors (such as MOS transistor 1021, MOS transistor 1022, MOS transistor 1023,..., MOS transistor 102n). At the same time, it collects the monitoring signals of the acquisition component 101 (such as the electronic fuse), and the control component 300 exchanges information with the external system. The acquisition component 102 of the DCDC output current (such as a sampling resistor) calculates the output current of the DCDC converter by collecting the voltages at the voltage V1 and the voltage V2. The output current I1 = (V1 - V2) / R1. The second resistor R2 is a thermistor, that is, the temperature sampling resistor at the DCDC converter end. The resistance value of the second resistor R2 will change with the temperature. The third resistor R3 is a voltage division resistor, and V3 = V2*R3 / (R2 + R3). By collecting the voltage value of the voltage V3, the line temperature at the DCDC end can be obtained. Similarly, the resistor R4 is the sampling resistor of the input and output current of the battery end. By collecting the voltages at the voltage V4 (i.e., the node voltage between the battery and the resistor R4) and the voltage V5 (i.e., the node voltage between the resistor R4 and the resistor R5), the input and output current of the battery end is calculated. The current I2 = (V4 - V5) / R4. The resistor R5 is a thermistor, which is the temperature sampling resistor at the battery end. The resistance value of the resistor R5 will change with the temperature. The resistor R6 is a voltage division resistor, and V6 = V5*R6 / (R5 + R6). By collecting the voltage value of the voltage V6 (the node voltage between the resistor R5 and the resistor R6), the line temperature at the battery end can be obtained. The design scheme from the load 1 end to the load n end is similar to that of the vehicle-mounted battery 1000 (i.e., the second power supply component) and the DCDC end or the generator (i.e., the first power supply component). To avoid redundancy, it will not be elaborated in detail here.

[0050] Thus, the acquisition component 100 can accurately acquire the voltages of different nodes in the low-voltage power distribution system; through the processing and transmission of the processing unit, the voltage condition of the low-voltage power distribution system can be monitored in real time, providing important data support for the safe and stable operation of the embodiments of the present application; at the same time, the addition of the capacitor reduces the noise interference and improves the accuracy of voltage measurement.

[0051] Optionally, in some embodiments, the multiple switching devices are all MOS transistors.

[0052] It can be understood that each MOS transistor (such as MOS transistor 1021, MOS transistor 1022, MOS transistor 1023,..., MOS transistor 102n) is respectively installed on the first power supply component branch, the second power supply component branch and each load branch of the low-voltage power distribution system to ensure that each circuit part has independent switch control; each MOS transistor forms a pair with its corresponding acquisition component 100 (such as MOS transistor 1021 corresponding to acquisition component 101, MOS transistor 1022 corresponding to acquisition component 102, MOS transistor 1023 corresponding to acquisition component 103,..., MOS transistor 102n corresponding to acquisition component 10N), that is, an acquisition component is responsible for monitoring the electrothermal parameters of this branch, and then controlling the corresponding MOS transistor to perform a switching action according to these data; under normal circumstances, the MOS transistor usually remains in the conducting state to allow current to pass through; once an abnormal situation (such as overcurrent, over-temperature, etc.) is detected, the control component 300 will send an instruction to the corresponding MOS transistor to quickly cut off the circuit.

[0053] Optionally, in some embodiments, the fault detection device 10 of the low-voltage power distribution system further includes: a communication component, which is connected to the control component 300 and is used to connect the real-time information interaction between the control component 300 and the external system.

[0054] It can be understood that the communication component can be Figure 3 the CAN transceiver chip in, and the communication component is responsible for sending the electrothermal parameters (such as current, voltage, temperature, etc.), the battery SOC estimation result and the fault warning or processing information collected by the control component 300 to the external system; at the same time, it also receives instructions such as configuration update, threshold adjustment, query request, etc. from the external system and passes them to the control component 300 to perform corresponding operations; regularly reports the operating state of the low-voltage power distribution system to the external system, including but not limited to the health status, historical event records, etc.

[0055] Optionally, in some embodiments, the control component 400 includes: a first control unit and a second control unit. Wherein, the first control unit is configured to give a system warning reminder when the first electrothermal parameter meets the first preset warning condition, and / or the second electrothermal parameter meets the second preset warning condition, and / or the electrothermal parameter of any load meets the third preset warning condition; the second control unit is configured to give a system fault reminder when the first electrothermal parameter meets the first preset fault condition, and / or the second electrothermal parameter meets the second preset fault condition, and / or the electrothermal parameter of the load meets the third preset fault condition, and determine a target switch component from multiple switch components based on the electrothermal parameter that meets the preset fault condition, and send a disconnection instruction to the target acquisition component 100 corresponding to the target switch component, so that the target acquisition component 100 disconnects the target switch component based on the disconnection instruction.

[0056] Wherein, the first preset warning condition, the second preset warning condition, the third preset warning condition, the first preset fault condition, the second preset fault condition, and the third preset fault condition can be preset by the user, obtained through a finite number of experiments, or obtained through a finite number of computer simulations, and are not specifically limited herein.

[0057] It can be understood that the first control unit and the second control unit need to cooperate closely to ensure seamless connection between warning reminders and fault handling; by precisely monitoring electrothermal parameters, intelligently warning, and handling faults, the control component can not only detect and handle potential safety hazards in a timely manner, but also respond quickly when a fault occurs, disconnect the faulty area, and protect the normal operation of the entire system. The embodiments of the present application allow adjusting warning and fault thresholds according to different vehicle models or usage environments to adapt to diverse requirements; considering the safety of the system, redundant design such as a multiple confirmation mechanism or a backup power supply also needs to be considered to ensure normal operation even under extreme conditions.

[0058] Optionally, in some embodiments, the second power supply component is a storage battery, and the second electrothermal parameter includes the state of charge of the storage battery, where the state of charge of the storage battery is:

[0059]

[0060] Where SOC1 is the initial SOC estimated for the storage battery, and I is the current value of the storage battery terminal collected in real time.

[0061] It can be understood that in the embodiments of the present application, the initial SOC is added to the charge increment obtained after ampere-hour integration to obtain the latest SOC value, which will be continuously updated with the changes in time and current to reflect the current actual charge level of the storage battery. By estimating the SOC in real time and taking corresponding management measures in the embodiments of the present application, it is ensured that the storage battery has sufficient power supply at critical moments, the reliability of the entire system is improved, the more efficient utilization of energy is realized, and energy waste is reduced; reasonable charging and discharging management can significantly extend the service life of the storage battery, reduce the replacement cost, and bring a more reliable and efficient power experience to users.

[0062] Optionally, in some embodiments, the system warning reminder includes at least one of overcurrent warning reminder, undervoltage warning reminder, overvoltage warning reminder, overtemperature warning reminder, and low SOC warning reminder; the system fault reminder includes at least one of overcurrent fault reminder, undervoltage fault reminder, overvoltage fault reminder, overtemperature fault reminder, and short-circuit fault reminder.

[0063] Specifically, when the actually collected current is greater than the designed rated current but does not exceed the warning maximum current and the duration is ≥ 300 ms, an overcurrent warning reminder is reported; for a 12V system, when the voltage 10V ≤ supply voltage < 11V and the duration is ≥ 300 ms, an undervoltage warning is reported; for a 24V system, when the voltage 20V ≤ supply voltage < 22V and the duration is ≥ 300 ms, an undervoltage warning reminder is reported; for a 12V system, when the voltage 15V < supply voltage ≤ 16V and the duration is ≥ 300 ms, an overvoltage warning is reported; for a 24V system, when the voltage 30V < supply voltage ≤ 32V and the duration is ≥ 300 ms, an overvoltage warning reminder is reported; when the loop temperature is greater than the designed rated temperature but does not exceed the warning maximum temperature and the duration is ≥ 300 ms, an overtemperature warning reminder is reported. When the SOC of the storage battery ≤ 50% and the duration is ≥ 300 ms, a low SOC warning reminder is reported.

[0064] Further, when the actual collected current > the warning maximum current and the duration ≥ 300 ms, cut off the overcurrent circuit and report an overcurrent fault reminder; for the 12V system, when the supply voltage < 10V and the duration ≥ 300 ms, report an undervoltage fault; for the 24V system, when the supply voltage < 20V and the duration ≥ 300 ms, report an undervoltage fault reminder. For the 12V system, when the supply voltage > 16V and the duration ≥ 300 ms, report an overvoltage fault; for the 24V system, when the supply voltage > 32V and the duration ≥ 300 ms, report an overvoltage fault reminder; when the loop temperature is greater than the warning maximum temperature and the duration ≥ 300 ms, cut off the over-temperature circuit and report an over-temperature fault reminder; when the actual current ≥ 10 times the rated current and the duration ≥ 3 us, report a short-circuit fault reminder and cut off the short-circuit circuit.

[0065] It should be noted that the various fault thresholds in the embodiments of the present application are all initial default thresholds, which can be thresholds preset by users, thresholds obtained through a limited number of experiments, or thresholds obtained through a limited number of computer simulations. Specific limitations are not made here, and in actual projects, they can be recalibrated according to the performance of different loads in the actual vehicle.

[0066] To facilitate those skilled in the art to further understand the fault detection device of the low-voltage power distribution system in the embodiments of the present application, the following will be described in detail in combination with the fault detection method of the low-voltage power distribution system, as Figure 4 shown, the fault detection method of the low-voltage power distribution system includes the following steps:

[0067] S401, the whole vehicle is awakened.

[0068] S402, collect the voltage, current, and temperature information of the battery terminal and the load terminal.

[0069] While performing step S403, step S411 is executed.

[0070] S403, detect whether any one of the voltage, current, and temperature exceeds the corresponding design threshold; if so, execute step S404, otherwise, execute step S405.

[0071] S404, process the fault and report the fault information.

[0072] S405, the whole vehicle is normally powered on.

[0073] S406, after the whole vehicle is normally powered on, continuously collect the voltage, current, and temperature information of the low-voltage power distribution system.

[0074] S407, detect whether any one of the voltage, current, and temperature is within the corresponding warning threshold; if so, execute step S408, otherwise, return to execute step S406.

[0075] S408, issue a fault warning for potential faults.

[0076] S409, detect whether any of the voltage, current, and temperature exceeds the corresponding fault warning threshold; if so, execute step S410, otherwise, return to execute step S408.

[0077] S410, handle the fault and report the fault information to end the current process.

[0078] S411, obtain the initial voltage value of the battery.

[0079] S412, estimate the initial state of charge (SOC) of the battery based on the initial voltage value.

[0080] S413, continuously monitor the current change at the battery terminal and collect the input and output currents at the battery terminal in real time.

[0081] S414, dynamically estimate the battery SOC according to the initial SOC and the real-time input and output currents.

[0082] S415, detect whether the battery SOC is lower than the design threshold; if so, execute step S416, otherwise, return to execute step S414.

[0083] S416, issue a fault warning for potential faults to end the current process.

[0084] For the fault detection device of the low-voltage power distribution system proposed according to the embodiment of the present application, a plurality of acquisition components are respectively arranged on the branches corresponding to the first power supply component, the branches corresponding to the second power supply component, and the branches corresponding to each load of the low-voltage power distribution system, and are used to collect the first electro-thermal parameter, the second electro-thermal parameter, and the electro-thermal parameter of each load; the switch component includes a plurality of switch elements, which are correspondingly arranged on the branches corresponding to the first power supply component, the branches corresponding to the second power supply component, and the branches corresponding to each load; the control component is respectively connected to the plurality of acquisition components, determines the target switch element according to the electro-thermal parameter, and sends a disconnection instruction to the corresponding target acquisition component, so that it disconnects the target switch element based on the disconnection instruction. Thus, the problems such as the limited fault detection of the vehicle's low-voltage power distribution system in the related art are solved, and the safety of the vehicle's low-voltage power distribution system is improved.

[0085] Next, refer to the drawings to describe a fault detection method for a low-voltage power distribution system according to an embodiment of the present application.

[0086] In this embodiment, the fault detection method of the low-voltage power distribution system adopts Figure 2 the fault detection device of the low-voltage power distribution system shown in the embodiment.

[0087] As Figure 5As shown, the fault detection method for the low-voltage power distribution system includes the following steps:

[0088] In step S501, collect the first electrothermal parameter of the first power supply component, the second electrothermal parameter of the second power supply component, and the electrothermal parameter of each load.

[0089] In step S502, determine the target switch from multiple switch components according to the first electrothermal parameter, the second electrothermal parameter, and the electrothermal parameter of each load.

[0090] In step S503, send a disconnection instruction to the target acquisition component corresponding to the target switch, so that the target acquisition component disconnects the target switch based on the disconnection instruction.

[0091] It should be noted that the foregoing explanation of the embodiment of the fault detection device for the low-voltage power distribution system also applies to the fault detection method for the low-voltage power distribution system of this embodiment, and will not be elaborated here.

[0092] According to the fault detection method for the low-voltage power distribution system proposed in the embodiment of the present application, after collecting the first electrothermal parameter of the first power supply component, the second electrothermal parameter of the second power supply component, and the electrothermal parameter of each load, the target switch can be determined from multiple switch components according to the first electrothermal parameter, the second electrothermal parameter, and the electrothermal parameter of each load, and then a disconnection instruction is sent to the target acquisition component corresponding to the target switch, so that the target acquisition component disconnects the target switch based on the disconnection instruction. Thus, problems such as the limited fault detection of the vehicle's low-voltage power distribution system in the related art are solved, and the safety of the vehicle's low-voltage power distribution system is improved.

[0093] In addition, the embodiment of the present application also provides a vehicle, which includes the above-mentioned fault detection device for the low-voltage power distribution system.

[0094] According to the vehicle proposed in the embodiment of the present application, through the above-mentioned fault detection device for the low-voltage power distribution system, problems such as the limited fault detection of the vehicle's low-voltage power distribution system in the related art are solved, and the safety of the vehicle's low-voltage power distribution system is improved.

[0095] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0096] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "N" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0097] Any process or method description shown in the flowchart or described otherwise herein may be understood to represent a module, segment, or portion of code including one or more executable instructions for implementing a customized logic function or process step, and the scope of the preferred embodiments of the present application includes additional implementations where functions may be executed in a substantially simultaneous manner or in a reverse order according to the involved functions, rather than in the order shown or discussed, which should be understood by those skilled in the art to which the embodiments of the present application pertain.

[0098] It should be understood that each part of the present application can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits with logic gate circuits for implementing logical functions on data signals, application specific integrated circuits with appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0099] Those of ordinary skill in the art of the present technology can understand that all or part of the steps carried by the method of the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

Claims

1. A fault detection device for a low voltage power distribution system, characterized in that: include: Acquisition component, switch component and control component, among which, The acquisition component includes a plurality of acquisition components, which are respectively arranged at a branch corresponding to a first power supply component of the low-voltage power distribution system, a branch corresponding to a second power supply component of the low-voltage power distribution system, and a branch corresponding to each load, and are used to collect a first electrothermal parameter of the first power supply component, a second electrothermal parameter of the second power supply component, and an electrothermal parameter of each load; The switch assembly includes a plurality of switch components, which are respectively arranged in a branch corresponding to a first power supply assembly of the low-voltage power distribution system, a branch corresponding to a second power supply assembly of the low-voltage power distribution system, and a branch corresponding to each load, and the plurality of switch components and the plurality of acquisition components are arranged in a one-to-one correspondence; A control component, wherein the control component is connected to the multiple acquisition components respectively, and the control component determines a target switch component from the multiple switch components according to the first electrothermal parameter, the second electrothermal parameter and the electrothermal parameter of each load, and sends a disconnection instruction to the target acquisition component corresponding to the target switch component, so that the target acquisition component disconnects the target switch component based on the disconnection instruction.

2. The fault detection device for a low voltage power distribution system according to claim 1, characterized in that: Each acquisition unit includes: first to third resistors, capacitors and a processing unit, wherein: A first resistor, one end of the first resistor is connected to the low-voltage power distribution system, and the other end of the first resistor is connected to the switch assembly; a second resistor, one end of the second resistor being connected to a connection node between the first resistor and the switch component, and the other end of the second resistor being connected to the third resistor; One end of the capacitor is connected to one end of the first resistor and the first end of the processing unit respectively, and the other end of the capacitor is connected to a ground node; The second end of the processing unit is connected to one end of the first resistor, the third end of the processing unit is connected to the other end of the first resistor, the fourth end of the processing unit is connected to the connection node between the second resistor and the third resistor, the fifth end of the processing unit is connected to the other end of the third resistor, the control end of the processing unit is connected to the corresponding switch element, and the ground end of the processing unit is connected to the ground node, which is used to collect the voltage of one end of the first resistor, the voltage of the other end of the first resistor, and the voltage of the connection node between the second resistor and the third resistor.

3. The fault detection device for a low-voltage power distribution system according to claim 2, wherein the first electrothermal parameter, the second electrothermal parameter and the electrothermal parameter of each load all include line temperature, wherein: The line temperature is obtained from a voltage at a connection node between the second resistor and the third resistor.

4. The fault detection device for a low voltage power distribution system according to claim 1, characterized in that: The control component comprises: A first control unit, configured to issue a system warning reminder when the first electric heating parameter satisfies a first preset warning condition, and / or the second electric heating parameter satisfies a second preset warning condition, and / or the electric heating parameter of any load satisfies a third preset warning condition; The second control unit is used to issue a system fault reminder when the first electrothermal parameter meets the first preset fault condition, and / or the second electrothermal parameter meets the second preset fault condition, and / or the electrothermal parameter of the load meets the third preset fault condition, and based on the electrothermal parameters that meet the preset fault conditions, determine the target switch component from the multiple switch components, and send a disconnection instruction to the target acquisition component corresponding to the target switch component, so that the target acquisition component disconnects the target switch component based on the disconnection instruction.

5. The fault detection device for a low voltage power distribution system according to claim 1, characterized in that: The second power supply component is a battery, and the second electrothermal parameter includes a state of charge of the battery, wherein the state of charge of the battery is: Among them, SOC1 is the estimated initial SOC of the battery, and I is the current value of the battery terminal collected in real time.

6. The device according to claim 1, characterized in that The system warning reminder includes at least one of an overcurrent warning reminder, an undervoltage warning reminder, an overvoltage warning reminder, an overtemperature warning reminder, and a SOC too low warning reminder; The system fault reminder includes at least one of an overcurrent fault reminder, an undervoltage fault reminder, an overvoltage fault reminder, an overtemperature fault reminder and a short circuit fault reminder.

7. The fault detection device for a low voltage power distribution system according to claim 1, characterized in that: Also includes: A communication component is connected to the control component and is used to connect the control component with an external system for real-time information interaction.

8. The fault detection device for a low voltage power distribution system according to any one of claims 1 to 8, characterized in that: The multiple switch elements are all MOS tubes.

9. A vehicle, characterized in that: include: A fault detection device for a low voltage power distribution system as claimed in any one of claims 1 to 8.

10. A fault detection method for a low voltage power distribution system, characterized in that: A low voltage power distribution system fault detection device according to any one of claims 1 to 8 is used, wherein the method comprises the following steps: Collecting a first electrothermal parameter of the first power supply component, a second electrothermal parameter of the second power supply component, and an electrothermal parameter of each load; determining a target switching element from the plurality of switching elements according to the first electrothermal parameter, the second electrothermal parameter, and the electrothermal parameter of each load; A disconnection instruction is sent to a target acquisition component corresponding to the target switch component, so that the target acquisition component disconnects the target switch component based on the disconnection instruction.

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