An electric vehicle cable high temperature and overcurrent alarm control system and method

Abstract

This invention discloses a high-temperature and overcurrent alarm control system and method for electric vehicle cables, including a cable sensor, a microprocessor, and an alarm device. The cable sensor monitors the cable's status data, and its output is connected to the microprocessor. The microprocessor analyzes the monitored cable status data to determine whether the cable is abnormal. The output of the microprocessor is connected to the alarm device, which drives the alarm device to issue a corresponding alarm signal based on the abnormal cable status. The advantages of this invention are: it enables temperature and current monitoring of high-voltage cables in electric vehicles, allowing for timely issuance of corresponding alarms or safety strategies, thereby improving the safety of electric vehicles.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle safety monitoring, and in particular to a control system and method for high temperature and overcurrent alarms in electric vehicle cables. Background Technology

[0002] The high-voltage platform of electric vehicles is evolving from 400V to 800V and even higher. This higher voltage necessitates high-voltage cables to connect various electrical components. The stability and reliability of these high-voltage cables are crucial for the safe operation of vehicles.

[0003] In the event of collisions or scrapes, high-voltage cables are prone to various faults such as short circuits and high temperatures. These faults can easily lead to overcurrent and overtemperature. If not effectively monitored, this can result in safety hazards or even thermal runaway. Currently, there is no effective solution for monitoring the temperature and current of high-voltage cables. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high temperature and overcurrent alarm control system and method for electric vehicle cables, so as to realize the monitoring of temperature and current of high voltage cables of electric vehicles, and issue corresponding alarms or safety strategies in a timely manner, thereby improving the safety of electric vehicles.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A high temperature and overcurrent alarm control system for electric vehicle cables includes a cable sensor, a microprocessor, and an alarm device.

[0007] The cable sensor is used to monitor the status data of the cable, and its output is connected to a microprocessor.

[0008] The microprocessor analyzes the monitored cable status data to determine whether the current cable is abnormal. The output of the microprocessor is connected to an alarm device, and the microprocessor drives the alarm device to issue a corresponding alarm signal based on the abnormal state of the cable.

[0009] The cable sensor includes a temperature sensor and a current sensor, used to detect the temperature data and current data of the cable respectively; and to determine whether the cable is in an abnormal state based on the temperature and / or current data.

[0010] The alarm device includes a vehicle-mounted alarm device and / or a remote alarm device;

[0011] The vehicle-mounted alarm device is used to issue on-site alarm reminders; the remote alarm device is used to issue alarm reminders to remote users.

[0012] The microprocessor is connected to the pure electric vehicle monitoring platform via a CAN network. The pure electric vehicle monitoring platform is used to receive and store alarm signals and corresponding cable status data.

[0013] The microprocessor is connected to the vehicle power system and controls the vehicle power system according to the level of abnormal status.

[0014] The microprocessor is connected to the vehicle's powertrain system and is used to issue limiting commands to the vehicle's powertrain system based on abnormal cable conditions.

[0015] The microprocessor periodically starts up at regular intervals and determines whether the current and temperature data meet the minimum monitoring thresholds after startup. If they meet the thresholds, it enters the monitoring mode and then enters the sleep state after the monitoring mode ends, waiting for the next startup. If they do not meet the thresholds, it directly enters the sleep state and waits for the next timed startup.

[0016] A method for controlling high temperature and overcurrent alarms in electric vehicle cables uses cable sensors to monitor cable status data, analyzes the monitored cable status data to determine whether the current cable is abnormal, and drives an alarm device to issue a corresponding alarm signal based on the abnormal cable status.

[0017] The cable status data includes cable temperature data and cable current data. The temperature and current data of the cable are detected separately, and the current condition of the cable is determined based on the temperature and / or current data.

[0018] The microprocessor classifies the cable into abnormal levels based on the abnormal status data and issues corresponding alarm signals or protection commands according to the classification level.

[0019] The advantages of this invention are: it enables monitoring of the temperature and current of high-voltage cables in electric vehicles, promptly issuing corresponding alarms or safety strategies, thus improving the safety of electric vehicles. Abnormal temperature or current in the high-voltage cables can be promptly communicated to the driver via sound and light, allowing the driver to passively disconnect the power and leave the vehicle immediately. This device can also receive information from this device via the vehicle's CAN communication network and proactively handle this information: 1. The vehicle actively disconnects the power supply to prevent a fire caused by a continuous short circuit in the cable, or, if a fire has already occurred, promptly cuts off the power to slow the spread of the fire. 2. It can remotely transmit information to the vehicle monitoring platform, allowing monitoring personnel to promptly obtain vehicle information and direct relevant personnel to respond and take emergency measures. Attached Figure Description

[0020] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0021] Figure 1 This is a schematic diagram of a high temperature and overcurrent alarm control system for electric vehicle cables according to the present invention. Detailed Implementation

[0022] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and the description of the preferred embodiments.

[0023] This embodiment mainly addresses the monitoring of electric vehicle cables, especially high-voltage cables. Due to safety hazards such as overheating and overcurrent in cables, monitoring the cable status data can reduce vehicle safety issues caused by cable problems.

[0024] like Figure 1 The diagram shown is a hardware schematic of the cable monitoring and alarm system in this embodiment; a high temperature and overcurrent alarm control system for electric vehicle cables includes a cable sensor, a microprocessor, and an alarm device.

[0025] Cable sensors are used to monitor cable status data, and their output is connected to a microprocessor.

[0026] The microprocessor analyzes the monitored cable status data to determine whether the current cable is abnormal. The output of the microprocessor is connected to an alarm device, and the microprocessor drives the alarm device to issue a corresponding alarm signal based on the abnormal state of the cable.

[0027] The microprocessor can be a separate external processor, which is then fixed to the vehicle by fasteners or other means to collect, process, and analyze vehicle data. Alternatively, the analysis and processing algorithms of the microprocessor can be integrated into the vehicle controller in software form to achieve the corresponding data collection, control, and analysis. Preferably, the functions of the microprocessor can be integrated into the battery management system (BMS), the body domain controller, the power domain controller, or the vehicle controller to achieve the corresponding functions and control.

[0028] Cable sensors include temperature sensors and current sensors, used to detect the temperature and current data of the cable, respectively; based on the temperature and / or current data, they determine whether the cable is in an abnormal state. Temperature sensors are responsible for collecting temperature information from the cable body or connector ends. Commonly used sensors include negative temperature coefficient thermistors, thermocouples, and integrated digital temperature chips. Taking NTC thermistors as an example, their resistance decreases exponentially with increasing temperature; a voltage divider circuit can convert the temperature signal into a voltage value that can be read by the controller. For high-voltage cables, temperature sensors are typically installed on the surface of the insulation layer or inside the connector near the metal terminals to detect the most likely hot spots for abnormalities. Temperature data reflects the thermal state of the cable under current operating conditions and is a direct basis for determining whether there is overload, poor contact, or heat dissipation failure. The placement of temperature sensors is determined according to actual needs and monitoring requirements, thereby achieving comprehensive monitoring of the cable. The high-precision current transformer senses the current value, which is transmitted to the current measuring device. After processing, the current measuring device transmits the numerical value to the microprocessor. The microprocessor then processes the data to generate three levels of information, which are then sent out: 1. An alarm voice is emitted directly through a speaker; 2. The signal is transmitted wirelessly to the temperature / current receiving module, which converts it into CAN network communication information for the electric vehicle. The electric vehicle's CAN network receives the information, processes it, and responds accordingly. The electric vehicle monitoring platform can receive information from the vehicle's CAN network as well as information from the current / temperature microprocessor. It processes, analyzes, tracks, and responds accordingly.

[0029] Current sensors are used to monitor the magnitude of current flowing through cables in real time. In high-voltage systems, common principles include the Hall effect and fluxgate magnetization. Hall sensors utilize the property of semiconductor materials generating a potential difference in a magnetic field to achieve non-contact measurement of DC or AC current, offering advantages such as fast response and good isolation. Current data represents the electrical load currently borne by the cable and is an important input parameter for analyzing the source of temperature rise. Through current sensors, the system can obtain information such as transient current values, current change rate, and cumulative current flow, providing basic data support for anomaly detection.

[0030] Alarm devices include vehicle-mounted alarm devices and / or remote alarm devices; vehicle-mounted alarm devices are used to issue on-site alarm alerts; remote alarm devices are used to issue alarm alerts to remote users. Local alarms can use sound, light, and electrical signal equipment installed on the vehicle itself. Their function is to provide intuitive and immediate warning information to occupants (driver, passengers) or nearby personnel outside the vehicle when an anomaly occurs, prompting on-site personnel to take rapid response measures. An alarm can be issued to alert occupants of the vehicle upon cable anomaly; vehicle-mounted alarm devices primarily employ multimodal alert methods to ensure effective information reception.

[0031] Visual warnings: Fault information is displayed via warning indicator lights on the dashboard or a multimedia screen. For example, the high-voltage system fault light illuminates, or a message appears on the screen saying, "Cable temperature too high, please stop and check." The advantage of visual warnings is that they clearly indicate the type of fault, making it easier for the driver to make an accurate judgment.

[0032] Auditory alarms: These are triggered by beeps, voice prompts, or specific warning sounds emitted through the vehicle's audio system. Auditory alarms have a compelling effect on attention, allowing the driver to perceive any abnormality immediately, even if their eyes are not on the dashboard. In emergency situations (such as signs of impending thermal runaway), high-frequency, intermittent beeps are typically used to create a sense of urgency.

[0033] Tactile alerts: Some high-end models also integrate haptic feedback, such as alerting the driver through seat vibration or steering wheel vibration. This type of alert is particularly effective in noisy environments or when the driver's attention is distracted.

[0034] A remote alarm device is a device or system that sends abnormal information to remote users (such as vehicle owners, fleet managers, after-sales service centers, or emergency rescue platforms) via a wireless communication network, such as a vehicle owner's mobile app. Its function is to overcome geographical limitations, enabling remote monitoring, post-incident tracing, and collaborative rescue. Remote alarms rely on the interaction between an in-vehicle communication terminal (such as a T-Box, i.e., a telematics box) and a cloud platform. When an abnormality triggers an alarm, the in-vehicle communication terminal uploads fault data (including abnormality type, time, location, key parameter snapshots, etc.) to the cloud server via 4G, 5G, or satellite communication networks. The cloud then pushes the alarm information to the remote user's mobile application, SMS, or monitoring platform according to preset rules. Remote alarm devices extend alarm information from inside the driver's cabin to outside the vehicle, solving the problem of when personnel are not present or when on-site personnel cannot access the information. Furthermore, remote alarms also have data recording and analysis functions: all alarm events are uploaded to the cloud, forming a fault database that can be used for subsequent fault tracing, product improvement, and insurance claims. The system employs both local and remote alarm protection. When the driver is inside the vehicle, the in-vehicle alarm is the primary response method; when the vehicle is parked, charging, or unattended, the remote alarm becomes the sole information channel. In the event of an anomaly, the in-vehicle alarm triggers first, ensuring immediate response from on-site personnel; subsequently, the remote alarm synchronizes critical information to the cloud and remote users, facilitating follow-up tracking and rescue. For minor anomalies, the system may only trigger an in-vehicle warning to alert the driver; for serious anomalies, both the in-vehicle emergency alarm and the remote alarm are activated simultaneously, forming a dual warning system.

[0035] In this embodiment, the microprocessor is connected to the electric vehicle monitoring platform via a CAN network. The electric vehicle monitoring platform receives and stores alarm signals and corresponding cable status data. Receiving and storing alarm signals and corresponding cable data through the electric vehicle monitoring platform facilitates data storage, traceability, and subsequent troubleshooting.

[0036] In this embodiment, the microprocessor determines whether the cable is abnormal based on temperature and current data, classifies and judges the abnormality, and connects to vehicle control based on the abnormality classification result to ensure vehicle safety and reliability. Specifically: the microprocessor is connected to the vehicle's power system and controls the vehicle's power system according to the abnormality level. The microprocessor is also connected to the vehicle's power system to issue limiting commands to the vehicle's power system based on the abnormality of the cable. The microprocessor looks up the corresponding abnormality level in a table based on a pre-set correspondence between current and temperature data and abnormality levels, and then outputs corresponding safety protection actions based on the abnormality level. These safety protection actions act on the vehicle to protect safety. In this embodiment, the safety star can act on both the power system and the power system. After an abnormality occurs, the microprocessor outputs safety commands to the corresponding power system and power system, such as a power disconnection command acting on the battery system to achieve high voltage reduction or power disconnection, improving safety; and issuing a power restriction command to the power system to limit power consumption.

[0037] In this embodiment, the microprocessor has a built-in timed startup unit, such as a built-in RTC wake-up module; it is used to periodically wake up the microprocessor after startup. The microprocessor periodically starts up at a timed interval and after startup, it judges whether the current and temperature data meet the minimum threshold for monitoring. If they meet the threshold, it enters the monitoring mode and enters the sleep state after the monitoring mode ends, waiting for the next startup; if they do not meet the threshold, it directly enters the sleep state and waits for the next timed startup.

[0038] In this embodiment, the microprocessor acquires the vehicle's power-on / off signals via the CAN network. When the vehicle is powered on, the microprocessor operates in real-time or is woken up at a fixed frequency to monitor the cable status. This is because cables may fail or malfunction at any time while the vehicle is operating, requiring real-time monitoring or monitoring at short, fixed intervals to detect cable abnormalities promptly and prevent further thermal runaway caused by abnormal cable temperature or current. When the vehicle is detected to be powered off, the microprocessor is woken up periodically via the RTC wake-up module, with the wake-up time dynamically adjustable.

[0039] A method for controlling high temperature and overcurrent alarms in electric vehicle cables uses cable sensors to monitor cable status data, analyzes the monitored cable status data to determine whether the current cable is abnormal, and drives an alarm device to issue a corresponding alarm signal based on the abnormal cable status.

[0040] The cable status data includes cable temperature data and cable current data. The temperature and current data of the cable are detected separately, and the current condition of the cable is determined based on the temperature and / or current data.

[0041] The microprocessor classifies the cable's abnormality level based on abnormal status data and issues corresponding alarm signals or protection commands according to the classification. The microprocessor also uses temperature and current data to determine if the cable is abnormal, classifies and judges the abnormality, and then integrates the abnormality classification results into the vehicle control system to ensure vehicle safety and reliability.

[0042] The microprocessor determines whether the cable is abnormal based on temperature and current data, classifies and judges the abnormality, and connects to vehicle control based on the abnormality classification result to ensure vehicle safety and reliability. Specifically: the microprocessor connects to the vehicle's power system and controls the power system according to the abnormality level. The microprocessor also connects to the vehicle's power system to issue limiting commands to the power system based on the abnormal cable status. It looks up the corresponding abnormality level in a table based on a pre-set mapping between current and temperature data and abnormality levels, and then outputs corresponding safety protection actions based on the abnormality level. These safety protection actions act on the vehicle to protect safety. In this embodiment, the safety star can act on both the power system and the power system. After an abnormality occurs, the microprocessor outputs safety commands to the corresponding power system and power system. For example, a power disconnect command acts on the battery system to reduce high voltage or disconnect power output, improving safety; a power limiting command is issued to the power system to restrict vehicle operation. When the cable temperature is abnormal, power output is prohibited or limited, thereby improving the safety of the high-voltage cable and reducing the impact of high cable temperature on vehicle safety.

[0043] In a preferred embodiment of this application, cable monitoring is performed by periodically waking the microprocessor via a built-in RTC wake-up module. Each wake-up activates the microprocessor in monitoring mode to monitor the cable. The microprocessor acquires vehicle power-on / off signals via the CAN network. When the vehicle is powered on, the microprocessor operates in real-time or is woken up at a fixed frequency to monitor the cable status. This is necessary because cables may fail or malfunction at any time while the vehicle is operating, requiring real-time monitoring or monitoring at short, fixed intervals to detect cable abnormalities promptly and prevent further thermal runaway caused by abnormal cable temperature or current. When the vehicle is detected to be powered off, the microprocessor is periodically woken up via the RTC wake-up module, with the wake-up time dynamically adjustable.

[0044] In this embodiment, the wake-up time of the RTC timed wake-up module is dynamically adjusted; the time for the microprocessor to enter the silent monitoring mode after wake-up is dynamically adjusted according to the vehicle's power-off time. After the vehicle is powered off, it is in a dormant state. At this time, monitoring is performed by the RTC wake-up module through timed wake-up. After the RTC wake-up module wakes up, it wakes up the microprocessor, which then enters the silent monitoring mode to monitor the vehicle's high-voltage cable. This achieves timed monitoring in the vehicle's static state after the high voltage is de-energized. Based on the monitoring status data, the vehicle is controlled and alarms are triggered, thus ensuring the purpose of vehicle monitoring after the engine is turned off.

[0045] Traditionally, RTC wake-up modules are activated periodically, with a fixed time interval. While this fixed timing is simple and convenient, it doesn't consider practical considerations. For example, if the time interval is too short, frequent microprocessor activations can unnecessarily drain the vehicle's battery, leading to power depletion and reduced driving range. Conversely, if the time interval is too long, prolonged silent monitoring can affect cable monitoring effectiveness and timeliness, ultimately impacting vehicle safety. Therefore, current RTC wake-up modules have their time intervals set differently depending on the situation. They can either monitor in real-time when the vehicle is powered on or use a shorter fixed interval. This is because when the vehicle is powered on, cable current surges and operating conditions can cause abnormal cable temperature and current, necessitating real-time monitoring. After power-off, unless additional external forces are applied, the cable's condition is only affected by the vehicle's continued operation under power. Therefore, monitoring the cables after power-off is also crucial.

[0046] This technical problem is solved by using a dynamically adjusted timing period instead of a fixed timing period. Specifically:

[0047] In this embodiment, the RTC wake-up time setting includes an initial wake-up time. Each time the vehicle is powered down, the RTC wake-up module starts waking up according to the initial wake-up time. Upon reaching the initial wake-up time, the RTC wake-up module wakes up the microprocessor, which then enters a silent monitoring mode. After silent monitoring is complete, it enters sleep mode, waiting for the next scheduled wake-up by the RTC wake-up module. During each scheduled wake-up after a power outage, the RTC wake-up module's wake-up time is longer than the previous one, gradually increasing until the vehicle is powered on again and restarted, at which point it enters the next scheduled wake-up after a power outage. This timed start strategy involves gradually increasing the time interval for each wake-up call. Specifically, the second wake-up time for the RTC module is longer than the first wake-up time. This dynamic setting of the time interval better adapts to actual usage scenarios involving cable abnormalities. In the immediate period after vehicle shutdown, the cable temperature may be high due to recent use, and collisions or scrapes during vehicle operation significantly increase the probability of abnormal cable temperatures or currents. Therefore, after power-off, the time interval gradually increases. This results in more frequent RTC wake-up calls immediately after power-off, while the interval between calls increases after a period of inactivity. This achieves the goal of frequent monitoring after power-off and reduced call frequency when the vehicle is stationary for extended periods. This strategy has at least two effects: First, it monitors the vehicle's electric safety status by frequently monitoring the initial period after power-off when there is a high risk, and extending the timed monitoring cycle after a long period of inactivity. The timing is dynamically adjusted to match the monitoring of safety conditions such as thermal runaway of the vehicle's cables, effectively improving the monitoring effect and timely detecting cable anomalies. Second, since the timing of the RTC wake-up module is variable, the longer the parking time, the longer the wake-up timing can be, reducing the power consumption of frequent starts, improving the safety of the vehicle when stationary, reducing energy consumption, increasing the vehicle's range, and reducing energy waste.

[0048] In another preferred embodiment of this example, after power-off, the RTC wake-up module starts the wake-up microprocessor at regular intervals according to the initial wake-up time. The initial wake-up time is dynamically set based on the vehicle's usage time. This is because the longer the vehicle travels, the higher the temperature of the cables becomes, and the greater the likelihood of abnormal cable temperatures. There are also more instances of collisions, scrapes, or other incidents that could pose safety hazards to the cables. Therefore, the initial wake-up time can be set based on the vehicle's travel time. The longer the vehicle's driving time, the shorter the initial wake-up time should be. A pre-calibrated lookup table between the initial wake-up time and the vehicle's driving time is stored in the controller. Before each power-down, the corresponding initial wake-up time is obtained based on the vehicle's driving time and set in the RTC wake-up module. The initial wake-up time can have a pre-defined range, with a pre-set maximum and minimum value to prevent excessive fluctuations and keep it within a reasonable range. The initial wake-up time is calculated based on the vehicle's driving time before each power-down, and then compared to the maximum and minimum values. If the calculated initial wake-up time is between the maximum and minimum values, it is stored as the final wake-up time in the vehicle controller. If the calculated initial wake-up time is greater than the maximum value, the maximum value is used as the initial wake-up time; if the calculated initial wake-up time is less than the minimum value, the minimum value is used as the initial wake-up time. Calculating the initial wake-up time by associating it with driving time effectively and accurately obtains the base time for RTC timed wake-up, meeting the requirements for subsequent timed startup and monitoring.

[0049] In another preferred embodiment, the time for the microprocessor to enter silent monitoring mode is dynamically adjusted based on the vehicle's power-off time; the longer the power-off time, the shorter the silent monitoring time. The time to enter silent monitoring mode can also be correlated with the number of timed wake-ups after power-off. The more timed wake-ups during a complete power-off state, the shorter the silent monitoring time after entering silent monitoring mode. The main rationale is that the longer the vehicle remains stationary, the lower the probability of abnormal cable temperature and current. Compared to immediately after high voltage is applied and then remaining stationary for several days, the probability of sudden thermal runaway is extremely low. Unless the vehicle is subjected to external force, the silent mode time should be shorter in cases of prolonged stationary operation without external force. Conversely, the silent monitoring time should be longer immediately after power-off to better monitor the cables effectively. The duration of the silent monitoring mode is inversely proportional to the vehicle's power-off time; the longer the vehicle is powered off, the shorter the silent monitoring mode duration. This reduces the problem of mismatch between monitoring time and risk. Following the principle of higher monitoring frequency for high-risk and shorter monitoring time for low-risk, unnecessary silent monitoring time can be effectively reduced, ensuring safety monitoring while minimizing energy waste caused by silent monitoring. In this embodiment, the duration of the silent monitoring mode and the power-off time are set in advance and stored in a reference table.

[0050] After detecting an abnormal cable temperature, the system assesses the risk of thermal runaway based on the cable's temperature data. If the cable temperature consistently exceeds a set threshold, a thermal runaway risk is identified. Thermal runaway could lead to a fire, which in turn could cause the vehicle to start. Therefore, upon determining that the cable is in a thermal runaway state, the system activates the vehicle's alarm system to send an alarm signal to the user and / or executes thermal runaway protection strategies. Specifically, when thermal runaway is detected, the vehicle alarm sends an alert to the vehicle site and also sends an alert to the owner's app via the vehicle network. This reduces the impact of thermal runaway on other vehicles or pedestrians by alerting the surrounding environment, and the alert to the owner's app serves as a reminder and notification to the user. The thermal runaway protection strategy includes issuing warning signals to the vehicle's surroundings and / or controlling the vehicle's movement by collecting data on the surrounding environment. Upon detecting a thermal runaway risk, the microprocessor wakes up the intelligent driving controller, which then initiates the thermal runaway safety strategy: acquiring data about the vehicle's surroundings through vehicle sensors and controlling the vehicle's powertrain to move the vehicle to an open area based on this data. The purpose of this is to reduce damage to other vehicles caused by thermal runaway of this vehicle. The onboard sensors, including cameras and radar, are used to detect the presence of pre-marked objects such as vehicles and pedestrians in the vicinity of the vehicle. When a pedestrian or vehicle is detected within a set range, the vehicle's power system is activated, and the vehicle is steered towards the location of the pedestrian or vehicle until there are no pedestrians or vehicles within a 2-4 meter radius around the vehicle. This reduces safety losses caused by thermal runaway, and in the early stages of thermal runaway, the power system can still support the vehicle to move slowly a small distance, minimizing the impact on surrounding vehicles in the event of thermal runaway in a parking space, and minimizing property damage in the event of thermal runaway.

[0051] The system architecture of this embodiment can be manufactured and installed separately in a vehicle as an independent device, or it can be integrated into the vehicle and reuse the vehicle's controller, such as integrating a microprocessor into the battery management system (BMS) controller. After integrating this alarm and monitoring system into the vehicle, it can promptly notify the driver of abnormal high-voltage cable temperature or current via sound and light, allowing the driver to passively cut off the power and leave the vehicle immediately. This device can also receive information transmitted by the vehicle via the vehicle's CAN communication network and proactively handle this information: 1. The vehicle actively cuts off the power to prevent a fire caused by a continuous short circuit in the cable, or, if a fire has already occurred, promptly cuts off the power to slow the spread of the fire. 2. It can remotely transmit information to the vehicle monitoring platform, allowing monitoring personnel to promptly obtain vehicle information and direct relevant personnel to respond and take emergency actions.

[0052] like Figure 1As shown, the alarm control in this embodiment comprises the following components: 1. A device for contacting and securing the high-voltage cable; this can be fixed between the cable and the connector, or at any position on the cable. 2. High-precision sensors: temperature sensor, current sensor. 3. Microprocessor. 4. Audio device. 5. CAN signal wireless generator. 6. Antenna. 7. Power supply device. 8. Auxiliary materials, etc. When the high-voltage cable temperature is within the normal operating range, this device is in a dormant state, consuming little power; when the high-voltage cable temperature rises, the power supply is activated, and monitoring begins to determine if the cable temperature reaches the alarm value. This value can be divided into three levels: Level 1, mild warning; Level 2, moderate; Level 3, highest level. Corresponding handling methods can be set according to the level.

[0053] When the high-voltage cable current is within the normal operating range, this device is in sleep mode with low power consumption. When the high-voltage cable current increases, the power supply is activated, and it begins monitoring whether the cable current reaches the alarm value. This value can be divided into three levels: Level 1, mild warning; Level 2, moderate; and Level 3, the highest level. Corresponding handling methods can be set according to the level.

[0054] In this embodiment, the high-precision temperature sensor transmits resistance change parameter values ​​to the temperature measuring device. After processing, the temperature measuring device transmits the values ​​to the microprocessor. The microprocessor then processes the data to generate three levels of information, which are then sent out: 1. An alarm voice is emitted directly through the speaker; 2. The signal is transmitted wirelessly to the temperature / current receiving module, which converts it into CAN network communication information for the electric vehicle via the CAN module. The CAN network of the electric vehicle receives the information, processes the relevant information, and responds accordingly.

[0055] In this embodiment, the high-precision current transformer senses the current value, which is then transmitted to the current measuring device. The current measuring device processes the value and transmits it as a numerical value to the microprocessor. The microprocessor then generates three levels of information and sends the information outwards: 1. It directly emits an alarm voice through a speaker; 2. It transmits the information wirelessly to the temperature / current receiving module, which converts it into CAN network communication information for the electric vehicle via the CAN module. The electric vehicle's CAN network receives the information, processes the relevant information, and responds accordingly. The electric vehicle monitoring platform can receive information from the vehicle's CAN network and also from the current / temperature microprocessor. It processes, analyzes, tracks, and responds accordingly. The high-precision temperature sensor transmits the resistance change parameter value to the temperature measuring device. The temperature measuring device processes the value and transmits it as a numerical value to the microprocessor. The microprocessor then generates three levels of information and sends the information outwards: 1. It directly emits an alarm voice through a speaker; 2. It transmits the information wirelessly to the temperature / current receiving module, which converts it into CAN network communication information for the electric vehicle via the CAN module. The electric vehicle's CAN network receives the information, processes the relevant information, and responds accordingly.

[0056] The alarm control scheme in this embodiment is applicable to pure electric vehicles and hybrid vehicles, such as electric cars and unmanned logistics vehicles. When applied to unmanned pure electric logistics vehicles, it is equivalent to adding a safety guarantee tool to ensure the reliable and safe operation of the high-voltage control system. Preventing fires in the high-voltage systems of pure electric vehicles emphasizes prevention to avoid endangering personnel and goods.

[0057] Electric vehicles using the above solution have the following technical advantages:

[0058] 1. The vehicle actively monitors changes in cable temperature and current, triggering an alarm when values ​​exceed warning thresholds and automatically cutting off power. Power can also be cut off passively by the driver, thus preventing fires and extinguishing potential fires in their early stages. In the event of a fire, information is transmitted wirelessly, independent of vehicle control, ensuring timely alarm dissemination.

[0059] 2. This device uses low-power electronic components, resulting in low power consumption.

[0060] 3. This device is easy to install. It can be connected independently of the vehicle's CAN communication network, or it can communicate with the vehicle's CAN network.

[0061] 4. This device only wakes up the monitoring when the temperature exceeds the set value; once the set parameter value is triggered, an alarm CAN message is generated and transmitted to the relevant network to wake up the corresponding response, thus avoiding a large amount of communication information.

[0062] 5. This device has a proactive approach to disaster prevention.

[0063] Obviously, the specific implementation of this invention is not limited to the above-described methods. Any non-substantial improvements made using the inventive concept and technical solution of this invention are within the protection scope of this invention.

Claims

1. A high temperature and overcurrent alarm control system for electric vehicle cables, characterized in that: Includes cable sensors, microprocessors, and alarm devices; The cable sensor is used to monitor the status data of the cable, and its output is connected to a microprocessor. The microprocessor analyzes the monitored cable status data to determine whether the current cable is abnormal. The output of the microprocessor is connected to an alarm device, and the microprocessor drives the alarm device to issue a corresponding alarm signal based on the abnormal state of the cable.

2. The electric vehicle cable high temperature and overcurrent alarm control system as described in claim 1, characterized in that: The cable sensor includes a temperature sensor and a current sensor, used to detect the temperature data and current data of the cable, respectively. Determine whether the current cable is in an abnormal state based on temperature and / or current data.

3. The electric vehicle cable high temperature and overcurrent alarm control system as described in claim 1, characterized in that: The alarm device includes a vehicle-mounted alarm device and / or a remote alarm device; The vehicle-mounted alarm device is used to issue on-site alarm reminders; the remote alarm device is used to issue alarm reminders to remote users.

4. The electric vehicle cable high temperature and overcurrent alarm control system as described in claim 1, characterized in that: The microprocessor is connected to the pure electric vehicle monitoring platform via a CAN network. The pure electric vehicle monitoring platform is used to receive and store alarm signals and corresponding cable status data.

5. A high temperature and overcurrent alarm control system for electric vehicle cables as described in any one of claims 1-4, characterized in that: The microprocessor is connected to the vehicle power system and controls the vehicle power system according to the level of abnormal status.

6. A high temperature and overcurrent alarm control system for electric vehicle cables as described in any one of claims 1-4, characterized in that: The microprocessor is connected to the vehicle's powertrain system and is used to issue limiting commands to the vehicle's powertrain system based on abnormal cable conditions.

7. A high temperature and overcurrent alarm control system for electric vehicle cables as described in any one of claims 1-4, characterized in that: The microprocessor periodically starts up at regular intervals and determines whether the current and temperature data meet the minimum monitoring thresholds after startup. If they meet the thresholds, it enters the monitoring mode and then enters the sleep state after the monitoring mode ends, waiting for the next startup. If they do not meet the thresholds, it directly enters the sleep state and waits for the next timed startup.

8. A method for controlling high temperature and overcurrent alarms in electric vehicle cables, characterized in that: Cable sensors are used to monitor cable status data. The monitored cable status data is analyzed to determine whether the current cable is abnormal. Based on the abnormal cable status, the alarm device is driven to issue a corresponding alarm signal.

9. The method for controlling high temperature and overcurrent alarms in electric vehicle cables as described in claim 8, characterized in that: The cable status data includes cable temperature data and cable current data. The temperature and current data of the cable are detected separately, and the current condition of the cable is determined based on the temperature and / or current data.

10. The method for controlling high temperature and overcurrent alarms in electric vehicle cables as described in claim 8, characterized in that: The microprocessor classifies the cable into abnormal levels based on the abnormal status data and issues corresponding alarm signals or protection commands according to the classification level.

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