Vehicle door unlocking control method and system based on super capacitor and storage medium

Abstract

The invention provides a vehicle door unlocking control method and system based on a super capacitor and a storage medium, and relates to the technical field of vehicle safety. The method comprises the following steps: configuring a super-capacitor bank as a standby power supply; continuously monitoring a vehicle collision detection signal, a main power supply voltage and a main power supply current; and when the collision detection signal is effective, the voltage of the main power supply is lower than a first set value and the current of the main power supply is lower than a second set value for a preset time, the connection between the main power supply and the vehicle door unlocking system is controlled to be disconnected, the voltage conversion circuit is activated to take over the power supply of the vehicle door unlocking system, and the voltage conversion circuit is powered by the super capacitor bank. When the main power supply loses power or drops suddenly due to collision, the super capacitor bank is switched to supply power through the voltage conversion circuit, so that stable power supply support is ensured in an unlocking instruction execution stage, and the core problem that an execution mechanism cannot act due to power loss when the main power supply is abnormal in a traditional scheme is remarkably solved.

Description

Technical Field

[0001] The present invention relates to the field of automobile safety technology, and in particular to a vehicle door unlocking control method, system and storage medium based on a supercapacitor. Background Art

[0002] With the rapid development of new energy vehicle technology, electrification and intelligence have become the core directions of vehicle design. Among them, the electric door system, as an important part of vehicle intelligence, realizes functions such as remote control, automatic opening and closing, and collision sensing unlocking of the door by integrating electronic control units, sensors and actuators, significantly improving user convenience and safety.

[0003] At present, the mainstream electric door unlocking solution mainly relies on the vehicle's low-voltage power supply (usually a 12V lead-acid battery or lithium battery). Its working logic is: when the user triggers the unlocking command, the door control module obtains power from the main power supply and drives the actuator to complete the unlocking action; however, when dealing with extreme working conditions such as vehicle collisions, for example, when a vehicle collision occurs, the violent impact may cause the low-voltage battery connection line to break, the battery body to be damaged, or the overcurrent protection mechanism of the vehicle electrical system to be triggered, resulting in a momentary power loss or voltage drop of the main power supply. At this time, if the door control module relies entirely on the main power supply, even if the collision sensor has issued an unlocking command, the actuator will be unable to operate due to the power interruption, and ultimately the door cannot be unlocked. This phenomenon is particularly prominent in new energy vehicles. Compared with traditional fuel vehicles, the low-voltage electrical system of new energy vehicles is more integrated, the risk of line short circuit after a collision is greater, and the probability of main power failure is significantly increased. Summary of the Invention

[0004] The purpose of the present invention is to provide a vehicle door unlocking control method, system and storage medium based on supercapacitors to solve the problem raised in the above background technology: the main power failure during a vehicle collision causes the vehicle door to be unable to unlock.

[0005] To achieve the above object, according to one aspect of the present invention, a method for controlling door unlocking based on a supercapacitor is provided, the method comprising:

[0006] Configure supercapacitor group as backup power supply;

[0007] Continuously monitor vehicle collision detection signals, main power voltage, and main power current;

[0008] When the collision detection signal is valid, and the main power voltage is lower than a first set value and the main power current is lower than a second set value for a predetermined time:

[0009] The control disconnects the main power supply from the door unlocking system and activates a voltage conversion circuit to take over the power supply of the door unlocking system, wherein the voltage conversion circuit is powered by the supercapacitor group.

[0010] In one possible implementation, the voltage conversion circuit includes:

[0011] A primary boost unit, used to boost the output voltage of the supercapacitor bank to a preset intermediate voltage value;

[0012] The secondary boost unit is used to boost the intermediate voltage value to a preset target voltage value.

[0013] In a possible implementation, the secondary boost unit adopts a multi-phase interleaved boost topology structure.

[0014] In a possible implementation, the supercapacitor group includes a plurality of supercapacitor cells, and the supercapacitor cells are connected in parallel.

[0015] In one possible implementation, the effective determination of the collision detection signal must simultaneously satisfy the following conditions:

[0016] The collision signal received through bus communication is in a valid state;

[0017] The collision sensor signal received through hard-wire direct connection is valid.

[0018] In a possible implementation, the voltage conversion circuit taking over the power supply of the door unlocking system includes:

[0019] Upon receiving an unlocking instruction, controlling the voltage conversion circuit to output a first voltage value to drive the vehicle door to unlock;

[0020] After receiving the door lock unlocked state signal, the voltage conversion circuit is controlled to switch the output voltage to a second voltage value lower than the first voltage value, and the second voltage value is used to provide the vehicle door unlocking system with a holding current required to maintain the vehicle door unlocked state.

[0021] According to another aspect of the present disclosure, a supercapacitor-based vehicle door unlocking system is provided, the system comprising:

[0022] Supercapacitor pack;

[0023] voltage conversion circuit;

[0024] A monitoring circuit is configured to: continuously monitor a vehicle collision detection signal, a main power supply voltage, and a main power supply current;

[0025] The controller is configured as:

[0026] When the collision detection signal is valid, and the main power voltage is lower than a first set value and the main power current is lower than a second set value for a predetermined time:

[0027] The control disconnects the main power supply from the door unlocking system and activates a voltage conversion circuit to take over the power supply of the door unlocking system, wherein the voltage conversion circuit is powered by the supercapacitor group.

[0028] In a possible implementation, the controller includes a signal verification unit, and the signal verification unit is configured to:

[0029] Verifying that a collision signal received via vehicle bus communication is in a valid state;

[0030] Verify that the collision sensor signal received through a dedicated hard-wired direct connection is valid;

[0031] The valid collision signal is output only when both the bus collision signal and the hard line collision signal are in valid state.

[0032] In one possible implementation, the monitoring circuit includes a main power monitoring unit and a collision signal monitoring unit;

[0033] The main power monitoring unit includes:

[0034] a voltage divider network and a voltage comparator for comparing the main power supply voltage with a first set value;

[0035] a current sampling resistor and a current detection circuit for detecting whether the main power supply current is continuously lower than a second set value for a predetermined time;

[0036] The collision signal monitoring unit is configured to receive a collision status signal communicated via a vehicle bus and a collision sensor signal directly connected via a hardwire.

[0037] According to another aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, in which at least one program code is stored. The at least one program code is loaded and executed by a processor to implement the supercapacitor-based vehicle door unlocking control method described in any of the above possible implementation methods.

[0038] The above one or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:

[0039] A supercapacitor-based door unlocking control method provided in an embodiment of the present invention monitors the collision signal, main power supply voltage and current in real time. When the composite conditions of the collision signal being valid, the main power supply voltage being lower than a first set value and the current being lower than a second set value for a predetermined time are met, that is, when the collision causes the main power supply to lose power or drop suddenly, the method switches to the supercapacitor group for power supply through the voltage conversion circuit to ensure stable power support during the execution phase of the unlocking instruction. This significantly improves the core problem of the traditional solution where the actuator cannot operate due to power failure when the main power supply is abnormal. At the same time, the multi-parameter joint monitoring mechanism effectively avoids the risk of false triggering of a single signal and improves control accuracy.

[0040] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a flow chart of a vehicle door unlocking control method based on a supercapacitor according to an exemplary embodiment;

[0042] Figure 2 The figure is a schematic diagram of the structure of a vehicle door unlocking system module based on a supercapacitor according to an exemplary embodiment.

[0043] Description of reference numerals: 100, supercapacitor group; 200, voltage conversion circuit; 300, monitoring circuit; 400, controller. DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0045] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of systems and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0046] Figure 1 A flow chart of a vehicle door unlocking control method based on a supercapacitor is provided according to an exemplary embodiment. Figure 1 As shown, the method includes the following steps:

[0047] In step S100, a supercapacitor group is configured as a backup power source; supercapacitors, also known as electrochemical capacitors or ultracapacitors, have the advantages of high power density, fast charge and discharge capabilities, and long life; compared with traditional batteries, supercapacitors can provide large currents in a short period of time, making them very suitable as a backup power source to provide instantaneous power support in emergency situations.

[0048] In an exemplary embodiment, a supercapacitor bank includes multiple supercapacitor cells connected in parallel. This parallel connection can share the current load, reducing stress on each supercapacitor and thus extending its service life. For example, by connecting two 200F / 2.3V supercapacitor cells in parallel, the total capacity can be doubled to 400F, while the ESR can be reduced by half.

[0049] In practical applications, considering the internal resistance of the supercapacitor, the efficiency of the voltage conversion circuit, and the system's requirements for voltage stability, the supercapacitor is usually not discharged to the minimum voltage. Therefore, the minimum operating voltage of the supercapacitor group is set to Vmin = 1.2V, and the actual available energy of the supercapacitor group is:

[0050]

[0051] Assuming that the energy required to unlock the door each time is 28J, the number of unlocks that can be supported by the available energy is: :

[0052] By connecting two 200F / 2.3V supercapacitors in parallel, a supercapacitor bank with a total capacity of 400F and an ESR of ≤0.5mΩ can be achieved. This design can provide 482J of available energy, supporting approximately 17 door unlocking operations. To ensure system reliability and safety, the number of unlocking operations can be set to 10, allowing the system to support 10 unlocking operations even in certain situations where energy utilization is low or there is energy loss.

[0053] In step S200 , the vehicle's collision detection signal, main power supply voltage, and main power supply current are continuously monitored. The collision detection signal is typically provided by the vehicle's airbag control unit (SRS) or other collision sensors. These sensors can detect the intensity and direction of a vehicle collision and send corresponding signals to the vehicle's control unit.

[0054] In automotive electrical systems, the main power supply refers to the power supply system that supplies power to the vehicle's low-voltage electrical system. In traditional fuel vehicles, the main power supply usually refers to a 12V lead-acid battery (also called a starting battery or auxiliary battery), which is used to power low-voltage electrical equipment such as the vehicle's lighting, audio, instrument panel, and door control systems. In new energy vehicles, the main power supply usually refers to a low-voltage lithium battery system with a voltage range of usually between 12V and 48V, which is used to power low-voltage electrical equipment such as the vehicle's lighting, instrument panel, infotainment system, electric power steering, and door control systems. The main power supply voltage refers to the voltage value output by the main power supply, which is the basis for the normal operation of the vehicle's low-voltage electrical system. The main power supply current refers to the current value output by the main power supply.

[0055] In step S300 , when the collision detection signal is valid, and the main power voltage is lower than the first set value and the main power current is lower than the second set value for a predetermined time;

[0056] Collision detection signals typically come from collision sensors installed on the vehicle. Common collision sensor types include accelerometers, pressure sensors, and collision sensor modules. Accelerometers detect changes in vehicle acceleration during a collision, while pressure sensors detect structural deformation or collision force. Collision sensor modules integrate multiple sensors to comprehensively determine the severity of a collision.

[0057] The first set value refers to the minimum operating threshold of the main power supply voltage, which is usually determined according to the design requirements of the vehicle's low-voltage electrical system. For example, for a 12V system, the first set value can be set to 9V; for a 24V system, the first set value can be set to 20V; voltage monitoring can be achieved through a voltage sensor. The sensor collects the voltage value of the main power supply in real time and transmits it to the controller. The controller judges the voltage value. When the voltage is lower than the first set value, for example, the voltage is lower than 9V, it may mean that there is an abnormality in the battery.

[0058] The second set value refers to the minimum operating threshold of the main power supply current, which is usually determined based on the load conditions of the vehicle's low-voltage electrical system. For example, the second set value can be set to 10mA. In order to avoid misjudgment caused by instantaneous current fluctuations, the system needs to determine whether the current is lower than the second set value for a predetermined time. For example, the predetermined time is 100ms. If the main power supply current is lower than 10mA for 100 consecutive ms, the system will determine that the current is abnormal.

[0059] Through comprehensive judgment of multiple parameters, the system can ensure that in the event of a vehicle collision and an abnormality in the main power supply, it can accurately and reliably switch to the backup power supply. This multi-parameter joint monitoring mechanism effectively avoids the risk of false triggering of a single signal, improves control accuracy, provides stable power support for the door unlocking system, and ensures vehicle safety and user experience.

[0060] In step S400, the controller disconnects the main power supply from the door unlocking system and activates a voltage conversion circuit, powered by a supercapacitor bank, to take over power to the door unlocking system. To quickly disconnect the main power supply from the door unlocking system, a relay is typically used as a switching element. When the combined conditions in step S300 are met, the controller issues a control signal. This signal drives the relay coil, causing the relay contacts to switch from a "closed" state to an "open" state, thereby severing the electrical connection between the main power supply and the door unlocking system. For example, a normally open relay can be used. When the coil is energized, the contacts close; when the coil is de-energized, the contacts open. In this example, the controller issues a control signal to de-energize the relay coil, causing the relay contacts to open.

[0061] Since the voltage of the supercapacitor group usually does not match the operating voltage of the door unlocking system, it is necessary to use a voltage conversion circuit to convert the voltage of the supercapacitor group into the voltage required by the door unlocking system. By controlling the relay to disconnect the main power supply from the door unlocking system and activating the voltage conversion circuit to be powered by the supercapacitor group, the system can ensure the normal operation of the door unlocking system in the event of an abnormality in the main power supply.

[0062] By real-time monitoring of the collision signal, main power supply voltage and current, when the combined conditions of the collision signal being valid, the main power supply voltage being lower than the first set value and the current being lower than the second set value for a predetermined period of time are met, that is, when the collision causes the main power supply to lose power or drop suddenly, the system switches to the supercapacitor group for power supply through the voltage conversion circuit to ensure stable power supply support during the execution phase of the unlocking instruction. This significantly improves the core problem of the traditional solution where the actuator cannot move due to power failure when the main power supply is abnormal. At the same time, the multi-parameter joint monitoring mechanism effectively avoids the risk of false triggering of a single signal and improves control accuracy.

[0063] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0064] In one possible implementation, the voltage conversion circuit includes:

[0065] The primary boost unit is used to increase the output voltage of the supercapacitor bank to a preset intermediate voltage value. The primary boost unit's main function is to increase the output voltage of the supercapacitor bank to a preset intermediate voltage value, which is usually lower than the target voltage value but higher than the output voltage of the supercapacitor bank.

[0066] The secondary boost unit is used to increase the intermediate voltage value to a preset target voltage value; the main function of the secondary boost unit is to further increase the intermediate voltage value output by the primary boost unit to the preset target voltage value.

[0067] In a single-stage boost circuit, the input voltage needs to be boosted to the target voltage all at once. For example, boosting 2.3V directly to 14V requires a very high boost ratio (the ratio of output voltage to input voltage). This high boost ratio increases switching and conduction losses, reducing overall conversion efficiency. This embodiment uses a bipolar boost circuit consisting of a primary boost unit and a secondary boost unit, dividing the boost process into two stages. The boost ratio in each stage is relatively low, reducing switching and conduction losses, and improving overall conversion efficiency, which can better meet the power supply requirements of the door unlocking system.

[0068] For example, the primary boost unit can use a chip model TI TPS54332, which can boost the voltage from 2.3V to 3.3V. The synchronous rectification technology of the TI TPS54332 chip can significantly improve conversion efficiency and reduce switching losses. It has a conversion efficiency of up to 95% and an output current capability of 3A, which helps to extend the power supply time of the supercapacitor group and can meet the needs of the primary boost unit. In order to support higher peak currents, two TPS54332 chips can be used in parallel. The parallel configuration can effectively share the current load and improve the overall current output capability, while reducing the operating temperature of each chip and improving reliability.

[0069] In an exemplary embodiment, the primary boost unit may further include a ferrite inductor, which has high saturation current, low iron loss, and good temperature stability, and is suitable for high-frequency switching applications. A 4.7μH / 3A ferrite inductor may be selected to control the output voltage ripple below 30mV to ensure voltage stability.

[0070] The secondary boost unit can use a chip model TI LM5146, which can boost the voltage from 3.3V to 14V. The TI LM5146 chip has a peak current output capability of 20A, which can meet the needs of the secondary boost unit. It also has a 4.2:1 boost ratio, which can increase 3.3V to 14V. Its conversion efficiency is ≥92%, which helps to improve the overall system efficiency.

[0071] In an exemplary embodiment, the secondary boost unit adopts a multi-phase interleaved boost topology. For example, the TI LM5146 chip adopts a dual-phase interleaved boost design, which can effectively reduce input current ripple, reduce electromagnetic interference, and improve current output capability.

[0072] The secondary boost unit can also include an output filter circuit to further filter out current ripple. For example, the output filter circuit can use tantalum capacitors and ceramic capacitors in parallel. Tantalum capacitors have high capacitance, low ESR, and good frequency characteristics, making them suitable for filtering applications. Ceramic capacitors have extremely low ESR and ESL, making them suitable for high-frequency filtering. A 10mF tantalum capacitor and a 100μF ceramic capacitor can be used in parallel to ensure that the output voltage ripple is less than 50mV, meeting the starting requirements of the door lock motor.

[0073] In an exemplary embodiment, in step S300, the valid determination of the collision detection signal must simultaneously satisfy the following conditions:

[0074] A collision signal received via bus communication is considered valid. For example, the collision signal is sent by the vehicle control unit (VCU) via the CAN bus, which uses differential signaling and is highly resistant to electromagnetic interference. The MCU (microcontroller) receives the collision signal on the CAN bus via the TJA1145 CAN transceiver. CAN frames contain CRC check bits, and the MCU verifies the integrity of the frame to ensure that the data has not been tampered with. For example, the MCU only responds to CAN frames with specific IDs, such as 0x123, to avoid receiving other unrelated signals inadvertently. The MCU also checks whether the data field meets the definition of a collision signal, such as whether it contains the data 0xFF indicating a collision has occurred.

[0075] Collision sensor signals received directly via hardwire are considered valid. A collision sensor (such as the ADXL345 accelerometer) is directly hardwired to the MCU's GPIO (general-purpose input / output) pins. Hardwire signals are high and low level signals that directly reflect the sensor's status. When the sensor detects acceleration exceeding a threshold, such as ≥5g, a collision is considered to have occurred, triggering a hardwire signal.

[0076] In order to eliminate signal jitter and noise, the hard-wired signal can be shaped by a Schmitt trigger to ensure signal stability and reliability.

[0077] The CAN bus may cause signal anomalies due to electromagnetic interference or node failure. Although the hard-wired signal is stable, it may cause false alarms due to mechanical failure of the sensor (such as adhesion of the collision sensor contacts). This embodiment uses a logical AND judgment mechanism. Only when both signals are valid at the same time is the collision considered to have actually occurred, avoiding misjudgment of a single signal.

[0078] In an exemplary embodiment, the voltage conversion circuit takes over the power supply of the vehicle door unlocking system including:

[0079] When receiving an unlock command, the control voltage conversion circuit outputs a first voltage value to drive the vehicle door to unlock; the unlock command can be issued by the vehicle's safety system, such as a collision detection system, remote control key or door handle sensor, and transmitted to the microcontroller via the CAN bus or hard wire. After the microcontroller receives the unlock command, it will immediately start the unlock process; the first voltage value is the voltage required for the vehicle door unlocking system to perform the unlocking action.

[0080] After receiving the door lock unlocked status signal, the control voltage conversion circuit switches the output voltage to a second voltage value lower than the first voltage value. The second voltage value is used to provide the door unlocking system with the holding current required to maintain the door unlocked state. The door lock unlocked status signal is usually issued by a sensor of the door unlocking system, such as a position sensor or a current sensor, and is transmitted to the microcontroller via the CAN bus or hard line. After receiving the door lock unlocked status signal, the microcontroller confirms that the unlocking action has been completed. The second voltage value is the voltage required to maintain the door unlocked state.

[0081] Through the above control strategy, the voltage conversion circuit can provide different operating voltages according to the different requirements of the door unlocking system. For example, it provides a high voltage during the unlocking phase to ensure the reliable execution of the unlocking action, and provides a low voltage during the maintenance phase to reduce power consumption and extend the power supply time of the supercapacitor bank.

[0082] For example, assuming the first voltage is 14V, the door unlocking system receives 14V and drives the actuator (such as the Bosch BLS120 door lock motor) to unlock the door. The unlocking action is usually completed within 100ms, and the voltage conversion circuit also provides up to 20A of current to meet the instantaneous demand when the motor starts. The second voltage is used to provide the door unlocking system with the holding current required to maintain the unlocked state. Assuming the second voltage is 12V and the holding current is 5A, the energy consumption during the unlocking phase is:

[0083]

[0084] The energy consumption during the maintenance phase is:

[0085]

[0086] The total energy consumption is:

[0087]

[0088] The actual available energy of the supercapacitor bank obtained according to the above embodiment is: The total energy consumption of a single unlocking is 58J, which is much lower than the available energy of the supercapacitor group, 482J, which can ensure the reliability and redundancy of the system.

[0089] In an exemplary embodiment, referring to Figure 2 The present disclosure also provides a supercapacitor-based door unlocking system, comprising:

[0090] Supercapacitor pack 100: This pack serves as a backup power source, providing power to the door unlocking system in the event of a main power failure. The pack can be connected in parallel, for example, two 200F / 2.3V supercapacitors can increase the total capacity to 400F and reduce the equivalent series resistance (ESR) to below 0.5mΩ. This parallel design shares the current load, reducing stress on individual capacitors and extending their service life. Furthermore, its high power density allows for rapid discharge of high currents, such as 20A instantaneous discharge, to meet the instantaneous power requirements of the door unlocking motor.

[0091] Voltage conversion circuit 200: The voltage conversion circuit 200 is responsible for increasing the voltage of the supercapacitor group 100 to a voltage suitable for the operation of the door unlocking system and providing different voltage outputs in different working stages.

[0092] The monitoring circuit 300 is configured to: continuously monitor the vehicle collision detection signal, the main power supply voltage, and the main power supply current;

[0093] The controller 400 is configured to:

[0094] When the collision detection signal is valid, and the main power supply voltage is lower than the first set value and the main power supply current is lower than the second set value for a predetermined time:

[0095] The control disconnects the main power supply from the door unlocking system and activates the voltage conversion circuit 200 to take over the power supply of the door unlocking system. The voltage conversion circuit 200 is powered by the super capacitor group 100.

[0096] For example, during actual operation, the monitoring circuit 300 continuously collects collision signals, main power supply voltage and current, and uploads them to the controller 400. The controller 400 analyzes the data and determines that the backup power supply needs to be switched only when the collision detection signal is valid and the main power supply voltage is lower than the first set value and the main power supply current is lower than the second set value for a predetermined time. At this time, the controller 400 controls the relay to disconnect the main power supply, activates the voltage conversion circuit 200, and drives the door lock motor to complete unlocking.

[0097] In an exemplary embodiment, the controller 400 includes a signal verification unit configured to:

[0098] Verifying that a collision signal received via vehicle bus communication is in a valid state;

[0099] Verify that the collision sensor signal received through a dedicated hard-wired direct connection is valid;

[0100] A valid collision signal is output only when both the bus collision signal and the hardline collision signal are in valid state.

[0101] The core task of the signal verification unit is to output a "valid crash signal" only when both the crash signal received via the vehicle bus communication and the signal from the hard-wired crash sensor are valid. This "AND" logic verification mechanism, cross-checked by dual redundant signal sources, completely eliminates misjudgments caused by interference or failure of a single signal source.

[0102] In an exemplary embodiment, the monitoring circuit 300 includes a main power monitoring unit and a collision signal monitoring unit;

[0103] The main power monitoring unit includes:

[0104] A voltage divider network and a voltage comparator are used to compare the main power supply voltage with a first set value. Directly connecting the main power supply voltage to the voltage comparator may cause its input to overload. Therefore, the high voltage needs to be proportionally attenuated to a low voltage range that the comparator can handle through the voltage divider network. The voltage comparator receives the divided voltage signal and a reference voltage (corresponding to the first set value), and outputs high and low levels by comparison to indicate whether the main power supply voltage is normal.

[0105] A current sampling resistor and current detection circuit are used to detect whether the main power supply current is continuously below a second set value for a predetermined time. Based on Ohm's law, a small-resistance sampling resistor (such as 0.1Ω) is connected in series with the main power supply circuit to convert the current into a voltage signal. The current detection circuit includes an instrument amplifier and a comparator to amplify the sampled voltage and determine whether it is continuously below the second set value. The duration of the current detection can be determined using an RC integrator circuit or an MCU timer. A "current anomaly" is only determined when the low level output of the current detection circuit persists for a predetermined time. This design can filter out instantaneous current fluctuations, such as the brief wake-up of a door sensor.

[0106] The collision signal monitoring unit is configured to receive the collision status signal communicated via the vehicle bus and the collision sensor signal directly connected via hard wire.

[0107] In an exemplary embodiment, a storage medium including instructions is also provided, such as a memory including instructions. The instructions can be executed by a processor of a terminal to implement the above-mentioned supercapacitor-based vehicle door unlocking control method. Optionally, the storage medium is a non-transitory computer-readable storage medium, such as a ROM (Read-Only Memory), RAM (Random Access Memory), CD-ROM (Compact Disc Read-Only Memory), magnetic tape, floppy disk, optical data storage device, etc.

[0108] In an exemplary embodiment, a computer program product is also provided, which includes computer program code, which is stored in a computer-readable storage medium. A processor of a computer device reads the computer program code from the computer-readable storage medium, and the processor executes the computer program code, so that the computer device performs the operations performed in the above-mentioned supercapacitor-based vehicle door unlocking control method.

[0109] Anything not described in detail in the present invention is well known to those skilled in the art.

[0110] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A vehicle door unlocking control method based on supercapacitor, characterized in that: include: Configure supercapacitor group as backup power supply; Continuously monitor vehicle collision detection signals, main power voltage, and main power current; When the collision detection signal is valid, and the main power voltage is lower than a first set value and the main power current is lower than a second set value for a predetermined time: The control disconnects the main power supply from the door unlocking system and activates the voltage conversion circuit to take over the power supply of the door unlocking system, wherein the voltage conversion circuit is powered by the supercapacitor group.

2. A vehicle door unlocking control method based on supercapacitor according to claim 1, characterized in that: The voltage conversion circuit includes: A primary boost unit, used to boost the output voltage of the supercapacitor bank to a preset intermediate voltage value; The secondary boost unit is used to boost the intermediate voltage value to a preset target voltage value.

3. The method for controlling door unlocking based on supercapacitor according to claim 2, characterized in that: The secondary boost unit adopts a multi-phase interleaved boost topology structure.

4. The method for controlling door unlocking based on supercapacitor according to claim 1, characterized in that: The supercapacitor group includes a plurality of supercapacitor cells, and the supercapacitor cells are connected in parallel.

5. The method for controlling door unlocking based on supercapacitor according to claim 1, characterized in that: The effective determination of the collision detection signal must simultaneously meet the following requirements: The collision signal received through bus communication is in a valid state; The collision sensor signal received through hard-wire direct connection is valid.

6. The method for controlling door unlocking based on supercapacitor according to claim 1, characterized in that: The voltage conversion circuit taking over the power supply of the door unlocking system includes: Upon receiving an unlocking instruction, controlling the voltage conversion circuit to output a first voltage value to drive the vehicle door to unlock; After receiving the door lock unlocked state signal, the voltage conversion circuit is controlled to switch the output voltage to a second voltage value lower than the first voltage value, and the second voltage value is used to provide the vehicle door unlocking system with a holding current required to maintain the vehicle door unlocked state.

7. A car door unlocking system based on supercapacitor, characterized in that: include: Supercapacitor pack; voltage conversion circuit; A monitoring circuit is configured to: continuously monitor a vehicle collision detection signal, a main power supply voltage, and a main power supply current; The controller is configured as: When the collision detection signal is valid, and the main power voltage is lower than a first set value and the main power current is lower than a second set value for a predetermined time: The control disconnects the main power supply from the door unlocking system and activates the voltage conversion circuit to take over the power supply of the door unlocking system, wherein the voltage conversion circuit is powered by the supercapacitor group.

8. The supercapacitor-based door unlocking system according to claim 7, characterized in that: The controller includes a signal verification unit, which is configured to: Verifying that a collision signal received via vehicle bus communication is in a valid state; Verify that the collision sensor signal received through a dedicated hard-wired direct connection is valid; The valid collision signal is output only when both the bus collision signal and the hard line collision signal are in valid state.

9. The supercapacitor-based door unlocking system according to claim 7, characterized in that: The monitoring circuit includes a main power monitoring unit and a collision signal monitoring unit; The main power monitoring unit includes: a voltage divider network and a voltage comparator for comparing the main power supply voltage with a first set value; a current sampling resistor and a current detection circuit for detecting whether the main power supply current is continuously lower than a second set value for a predetermined time; The collision signal monitoring unit is configured to receive a collision status signal communicated via a vehicle bus and a collision sensor signal directly connected via a hardwire.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores at least one program code, and the at least one program code is loaded and executed by the processor to implement the supercapacitor-based vehicle door unlocking control method according to any one of claims 1 to 6.

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