A method and system for controlling a capacitive switch

Abstract

The application provides a control method and system of a capacitive switch. The method comprises the following steps: when the capacitive switch of any door detects a touch signal, acquiring an image of the door; if it is determined according to the image of the door that a person touches the capacitive switch of the door, controlling the door to be unlocked; otherwise, keeping the door locked. The application can effectively avoid the false triggering of the capacitive switch by rain.

Description

Technical Field

[0001] This invention belongs to the field of vehicle door technology, specifically relating to a control method and system for a capacitor switch. Background Technology

[0002] Currently, an increasing number of door handles use capacitive switches as the control signal for car door handles. When a finger touches the area of ​​the capacitive switch, the BCM (Body Control Module) controls the door handle to open, close, or lock the car based on the input signal, thus enabling keyless locking and unlocking. Capacitive switches operate by collecting the capacitance of the human body; the voltage change caused by the capacitance fluctuation controls the output signal, thereby controlling the locking and unlocking of the car doors. However, due to the characteristics of capacitive switches, water on the touch area can affect them. Since the waveform of rain is similar to that of a human hand, it can easily cause false triggering of the capacitive switch. Existing technology often does not recognize false triggering by rainwater, leading to vehicle errors and excessive dark current, ultimately causing the entire vehicle system to lose power and fail to start. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the aforementioned background technology and provide a control method and system for a capacitor switch that can effectively prevent rainwater from falsely triggering the capacitor switch.

[0004] The technical solution adopted in this invention is: a control method for a capacitor switch, comprising the following steps:

[0005] Once the capacitive switch on any door detects a touch signal, an image of that door is captured.

[0006] If the image of the car door indicates that someone has touched the capacitive switch on the door, the door will be unlocked; otherwise, the door will remain locked.

[0007] In the above technical solution, the electronic exterior rearview mirror system is used to obtain images of the car door and determine whether anyone is touching the capacitive switch of the car door.

[0008] In the above technical solution, if the electronic exterior rearview mirror system determines that a person has touched the capacitive switch of the door, it generates a door unlock message and sends it to the capacitive switch; otherwise, it does not generate or send a door unlock message. The capacitive switch forwards the received door unlock message to the door control system. The door control system generates a door unlock control signal based on the received door unlock message to control the door to unlock.

[0009] In the above technical solution, when the vehicle is in a dormant state, if the capacitive switch detects a touch signal, it only wakes up the electronic exterior rearview mirror system to obtain the door image and determine whether someone has touched the capacitive switch of the door; if the electronic exterior rearview mirror system determines that someone has touched the capacitive switch of the door, it then wakes up the door control system to unlock the door; after the door is opened, it wakes up the other control systems of the vehicle.

[0010] The above technical solution also includes the following steps: when the capacitive switch detects a touch signal, if the capacitive switch does not receive a door unlock message within a set time during the current signal acquisition cycle, it will not forward the door unlock message.

[0011] In the above technical solution, the process of determining whether a person has touched the capacitive switch of the car door based on the car door image includes: if the absolute value of the difference between the pixel value and the average variance value of the door handle area in the car door image and the pixel value and the average variance value of other areas is greater than a set value, then it is determined that a person has touched the capacitive switch of the car door; otherwise, it is determined that no one has touched the capacitive switch.

[0012] In the above technical solution, the process of acquiring the door image includes: the electronic exterior rearview mirror system controls the electronic exterior rearview mirror corresponding to the capacitive switch that receives the touch signal to rotate to a set angle and take an image; and the set area of ​​the captured image is marked as the door handle area.

[0013] In the above technical solution, the process of determining whether the capacitive switch of the car door has detected a touch signal includes: if the baseline value detected by the capacitive switch reaches a set value, and the voltage value of the capacitive switch increases at the same time, then it is determined that the capacitive switch has detected a touch signal; otherwise, it is determined that the capacitive switch has not detected a touch signal.

[0014] In the above technical solution, when the key is inside the vehicle, the door unlocking is not performed using a control method based on a capacitive switch.

[0015] In the above technical solution, when the vehicle is in a dormant state, if the capacitive switch detects a touch signal, it first wakes up the key and identifies the key's location; if it determines that the key is not in the vehicle, it wakes up the electronic exterior rearview mirror system and executes subsequent steps; if it determines that the key is in the vehicle, it does not wake up the electronic exterior rearview mirror system and does not execute subsequent steps.

[0016] The present invention also provides a control system for a capacitor switch, used to execute the control method for the capacitor switch described in the above technical solution; including a capacitor switch, a vehicle door control system, and an electronic exterior rearview mirror system;

[0017] The capacitive switches are installed in each vehicle door to detect touch signals;

[0018] The electronic exterior rearview mirror system is used to acquire an image of the door when the capacitive switch of any door detects a touch signal;

[0019] The electronic exterior rearview mirror system is also used to determine whether someone has touched the capacitive switch of the door based on the image of the door. If it is determined that someone has touched the capacitive switch of the door, a door unlock message is generated and sent to the capacitive switch; otherwise, no door unlock message is generated or sent. The capacitive switch forwards the received door unlock message to the door control system.

[0020] The door control system is used to generate a door unlocking control signal based on the received door unlocking message, in order to control the door to unlock.

[0021] The beneficial effects of this invention are: this invention can ensure that the driver can open the car door by touching the capacitive switch in various situations, and can also identify whether someone is touching the car door by the car door image, and can also avoid the capacitive switch being accidentally triggered in rainy conditions.

[0022] Furthermore, this invention acquires images of the car doors through electronic exterior rearview mirrors and identifies whether anyone is touching the doors. While making reasonable use of the overall vehicle structure, it reduces the probability of accidental triggering of capacitive switches and improves the overall vehicle safety.

[0023] Furthermore, the present invention generates a door unlocking message through the electronic exterior rearview mirror system and sends it to the door control system. The door control system only controls the door to unlock after receiving the door unlocking message, which can effectively avoid false triggering of the capacitive switch.

[0024] Furthermore, in the dormant state, the present invention sequentially wakes up the capacitive switch, electronic rearview mirror, door control system and vehicle control system based on the recognition result of human touch, avoiding waking up other controllers on the vehicle, reducing the dark current of the vehicle and preventing the battery from being depleted.

[0025] Furthermore, if the capacitive switch of the present invention does not receive a door unlocking message from the electronic exterior rearview mirror system within a set time, it directly determines that no one has touched the capacitive switch, thereby avoiding false triggering of the capacitive switch and improving vehicle safety.

[0026] Furthermore, this invention determines whether there is a person at the door handle by comparing the pixel values ​​and average variance of the door handle area with those of other areas. This method is simple and direct, while also being highly accurate, ensuring the accuracy of personnel identification and saving computational costs.

[0027] Furthermore, the electronic exterior rearview mirror system of the present invention determines the door handle area in the captured image by setting the angle and area, thereby improving the efficiency and accuracy of image recognition and effectively saving computing costs.

[0028] Furthermore, this invention identifies whether a touch signal is detected by the baseline value and voltage value change of the capacitive switch, ensuring the accuracy of touch signal recognition and effectively avoiding misidentification caused by rainy weather.

[0029] Furthermore, the present invention first identifies the key position to ensure that the door unlocking operation based on the capacitive switch touch signal is not performed when the key is inside the vehicle, thus ensuring the safety of the vehicle user.

[0030] Furthermore, in the vehicle's sleep mode, the present invention first identifies the key position after the capacitive switch detects a touch signal, thus avoiding invalid wake-up and door unlocking operations, effectively saving vehicle energy and protecting vehicle safety. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the method flow of the present invention;

[0032] Figure 2 This is a schematic diagram of the system architecture of the present invention;

[0033] Figure 3 This is a schematic diagram illustrating the operating principle of a capacitor switch. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but these descriptions do not constitute a limitation on the present invention.

[0035] Example 1

[0036] like Figure 1 As shown, the present invention provides a control method for a capacitor switch, comprising the following steps:

[0037] Once the capacitive switch on any door detects a touch signal, an image of that door is captured.

[0038] If the image of the car door indicates that someone has touched the capacitive switch on the door, the door will be unlocked; otherwise, the door will remain locked.

[0039] Specifically, the invention uses an electronic exterior rearview mirror system to acquire images of the vehicle doors and determine whether anyone has touched the capacitive switches on the doors. This invention, by acquiring images of the vehicle doors through electronic exterior rearview mirrors and identifying whether anyone has touched them, makes efficient use of the vehicle's overall structure while reducing the probability of accidental triggering of the capacitive switches, thus improving overall vehicle safety.

[0040] Specifically, if the electronic exterior rearview mirror system determines that someone has touched the capacitive switch of the door, it generates a door unlock message and sends it to the capacitive switch; otherwise, it does not generate or send a door unlock message. The capacitive switch forwards the received door unlock message to the door control system. The door control system generates a door unlock control signal based on the received door unlock message to control the door unlocking, which can effectively avoid false triggering of the capacitive switch.

[0041] Specifically, when the vehicle is in sleep mode, if the capacitive switch detects a touch signal, only the electronic exterior rearview mirror system is activated to obtain the door image and determine if someone has touched the door's capacitive switch. If the electronic exterior rearview mirror system determines that someone has touched the door's capacitive switch, then the door control system is activated to unlock the door. After the door is opened, the other vehicle control systems are activated. In sleep mode, this invention sequentially activates the capacitive switch, electronic exterior rearview mirror, door control system, and vehicle control system based on the touch detection result, avoiding the activation of other controllers on the vehicle, reducing overall vehicle dark current, and preventing battery depletion.

[0042] Specifically, it also includes the following steps: when the capacitive switch detects a touch signal, if the capacitive switch does not receive a door unlock message within a set time during the current signal acquisition cycle, it will not forward the door unlock message, effectively avoiding false triggering of the capacitive switch and improving vehicle safety.

[0043] Specifically, the process of determining whether a person has touched the capacitive switch of a car door based on the door image includes: if the absolute value of the difference between the pixel value and average variance of the door handle area in the door image and the pixel value and average variance of other areas is greater than a set value, then it is determined that a person has touched the capacitive switch of the car door; otherwise, it is determined that no one has. This invention determines whether there is a person at the door handle by comparing the pixel value and average variance of the door handle area with other areas. It is simple and direct while having high accuracy, ensuring the accuracy of personnel identification while saving computational costs.

[0044] Specifically, the process of acquiring a car door image includes: the electronic exterior rearview mirror system controlling the electronic exterior rearview mirror corresponding to the capacitive switch that receives the touch signal to rotate to a set angle and capture an image; and marking a set area of ​​the captured image as the door handle area. The electronic exterior rearview mirror system of this invention determines the door handle area in the captured image by setting an angle and area, improving the efficiency and accuracy of image recognition and effectively saving computational costs. However, the door handle position varies for different car models, and the angle at which the electronic exterior rearview mirror can capture a full image of the door handle also varies. Therefore, the set angle and image setting area for different car models need to be calibrated experimentally.

[0045] Specifically, the process of determining whether the capacitive switch of the car door has detected a touch signal includes: if the baseline value detected by the capacitive switch reaches a set value, and the voltage value of the capacitive switch increases at the same time, then it is determined that the capacitive switch has detected a touch signal; otherwise, it is determined that the capacitive switch has not detected a touch signal. This invention identifies whether a touch signal is detected by measuring the baseline value and voltage value changes of the capacitive switch, ensuring the accuracy of touch signal recognition and effectively avoiding false recognition caused by rainy weather. The baseline setting value is obtained through experimentation, and the baseline setting value for different car models is set accordingly based on their attributes and experimental results.

[0046] Specifically, when the key is inside the vehicle, the door unlocking method is not performed based on a capacitive switch. This invention first identifies the key's position, ensuring that door unlocking operations based on capacitive switch touch signals are not performed when the key is inside the vehicle, thus guaranteeing the safety of vehicle occupants.

[0047] Specifically, when the vehicle is in a dormant state, if the capacitive switch detects a touch signal, it first wakes up the key and identifies the key's location; if it determines that the key is not inside the vehicle, it wakes up the electronic exterior rearview mirror system and executes subsequent steps; if it determines that the key is inside the vehicle, it does not wake up the electronic exterior rearview mirror system and does not execute subsequent steps, thus avoiding invalid wake-up operations and door unlocking operations, effectively saving vehicle energy and protecting vehicle safety.

[0048] Example 2

[0049] like Figure 2 As shown, the present invention also provides a control system for a capacitor switch, used to execute the control method for the capacitor switch described in the above technical solution; including a capacitor switch, a door control system, and an electronic exterior rearview mirror system;

[0050] The capacitive switches are installed in each vehicle door to detect touch signals;

[0051] The electronic exterior rearview mirror system is used to acquire an image of the door when the capacitive switch of any door detects a touch signal;

[0052] The electronic exterior rearview mirror system is also used to determine whether someone has touched the capacitive switch of the door based on the image of the door. If it is determined that someone has touched the capacitive switch of the door, a door unlock message is generated and sent to the capacitive switch; otherwise, no door unlock message is generated or sent. The capacitive switch forwards the received door unlock message to the door control system.

[0053] The door control system is used to generate a door unlocking control signal based on the received door unlocking message, in order to control the door to unlock.

[0054] It also includes a key system for identifying the key's location and feeding the identification result back to the electronic exterior rearview mirror system; the electronic exterior rearview mirror system selects whether to generate a door unlock message based on the key's location identification result. This invention first identifies the key's location, ensuring that door unlocking operations based on capacitive switch touch signals are not performed when the key is inside the vehicle, thus ensuring the safety of vehicle occupants.

[0055] Specifically, when the vehicle is in a dormant state, if the capacitive switch detects a touch signal, it first wakes up the key system and identifies the key's location; if it determines that the key is not inside the vehicle, it wakes up the electronic exterior rearview mirror system to determine whether someone has touched the capacitive switch of the door based on the door image; if it determines that the key is inside the vehicle, it does not wake up the electronic exterior rearview mirror system and does not unlock the door, thus avoiding invalid wake-up and door unlocking operations, effectively saving vehicle energy and protecting vehicle safety.

[0056] Specifically, when the vehicle is in sleep mode, if the capacitive switch detects a touch signal, only the electronic exterior rearview mirror system is activated to obtain the door image and determine if someone has touched the door's capacitive switch. If the electronic exterior rearview mirror system determines that someone has touched the door's capacitive switch, then the door control system is activated to unlock the door. After the door is opened, the other vehicle control systems are activated. In sleep mode, this invention sequentially activates the capacitive switch, electronic exterior rearview mirror, door control system, and vehicle control system based on the touch detection result, avoiding the activation of other controllers on the vehicle, reducing overall vehicle dark current, and preventing battery depletion.

[0057] Specifically, when the capacitive switch detects a touch signal, if it does not receive a door unlock message within a set time during the current signal acquisition cycle, it will not forward the door unlock message, effectively preventing false triggering of the capacitive switch and improving vehicle safety.

[0058] Specifically, the process by which the electronic exterior rearview mirror system determines whether a person has touched the capacitive switch of the door based on the door image includes: if the absolute value of the difference between the pixel value and average variance of the door handle area in the door image and the pixel value and average variance of other areas is greater than a set value, then it is determined that a person has touched the capacitive switch of the door; otherwise, it is determined that no one has. This invention determines whether there is a person at the door handle by comparing the pixel value and average variance of the door handle area with other areas. It is simple and direct while having high accuracy, ensuring accurate person identification while saving computational costs.

[0059] Specifically, the process of the electronic exterior rearview mirror system acquiring a door image includes: the electronic exterior rearview mirror system controlling the electronic exterior rearview mirror corresponding to the capacitive switch that receives the touch signal to rotate to a set angle and taking an image; and marking a set area of ​​the captured image as the door handle area. The electronic exterior rearview mirror system of this invention determines the door handle area in the captured image by setting an angle and area, improving the efficiency and accuracy of image recognition and effectively saving computational costs.

[0060] Specifically, the process of determining whether a touch signal is detected by the capacitive switch includes: if the baseline value detected by the capacitive switch reaches a set value, and the voltage value of the capacitive switch increases at the same time, then the capacitive switch is determined to have detected a touch signal; otherwise, the capacitive switch is determined not to have detected a touch signal. This invention identifies whether a touch signal is detected by changing the baseline value and voltage value of the capacitive switch, ensuring the accuracy of touch signal recognition and effectively avoiding false recognition caused by rainy weather.

[0061] Specifically, when the key is inside the vehicle, the door unlocking is performed using a control method that is not based on a capacitive switch.

[0062] Example 3

[0063] like Figure 3 As shown, the working principle of a capacitive switch is as follows: When a human hand touches the capacitive switch and forms a contact point, a path parallel to the ground is introduced through the "human body model," thereby increasing the apparent capacitance of the sensor. The touch capacitance Ct forms a series combination with the HBM capacitance Ch and the ground capacitance Cg. This increase is called the "touch increment."

[0064] In a series capacitor, the smallest capacitance plays a dominant role. Ct is much smaller than Ch, and in most applications, Ct is also much smaller than Cg. Therefore, Ct determines the change in the measured capacitance. When a finger approaches the sensor, it begins to transfer the electric field generated during the touch acquisition phase from free space to ground, causing a change in the sensor capacitance. This change in capacitance determines the sensor's detection state.

[0065] In normal vehicle operation, when a person touches the capacitive switch, the voltage of the capacitive switch system increases. At this point, the capacitive switch system outputs a high-level signal to the vehicle controller, which then responds to unlock the vehicle. However, in abnormal situations, this can cause the vehicle to unlock unnecessarily, leading to user complaints. Especially in sleep mode, the capacitive switch frequently wakes up the vehicle system, thereby waking up the vehicle network and causing excessive dark current. Experiments revealed that rainwater is the primary cause of false triggering of the capacitive switch. When rainwater flows over the capacitive switch, the capacitance input to the system is very similar to that of a human hand, which the capacitive switch system cannot recognize.

[0066] To address this issue, this specific embodiment introduces an electronic exterior rearview mirror system. This system replaces the traditional mechanical-electronic exterior rearview mirrors with a camera and a display screen. Its main operating logic is as follows:

[0067] When the vehicle is not in a dormant state, the main operating procedures are as follows:

[0068] 1. Because the baseline value read by the capacitive switch and the voltage increase after a person touches it are much smaller in both water-filled and water-free environments than under normal conditions, when the capacitive switch system detects a significant increase in the baseline value (reaching a certain set value) and simultaneously reads an increase in the voltage value of the capacitive switch, the capacitive switch will send a start message to the key system.

[0069] 2. After receiving the start message, the key system identifies the key location; if it determines that the key is not in the vehicle, it sends an identification image message to the electronic exterior rearview mirror system and executes subsequent steps; if it determines that the key is in the vehicle, it does not execute subsequent steps.

[0070] 3. After receiving the image recognition message, the electronic exterior rearview mirror system checks whether there is a hand near the door handle in the current state. The electronic exterior rearview mirror matches and recognizes a designated area of ​​the selected image (the door handle of the capacitive switch; the selected area varies depending on the vehicle model and needs to be calibrated according to the actual vehicle model). When a hand is touching the door, the pixel value and mean variance value of the recognition area will be different. If the electronic exterior rearview mirror system determines that there is a person at the door handle, it sends a door unlock message to the capacitive switch.

[0071] 4. If the capacitive switch does not receive a door unlock message from the electronic exterior rearview mirror system within 2 seconds of sending the start message, the electronic exterior rearview mirror system determines that no person has been identified. In this case, it will not fail to send relevant information to the door control system, thus avoiding mis-locking of the vehicle and preventing user complaints. If the capacitive switch normally receives the door unlock message from the electronic exterior rearview mirror system within 2 seconds of sending the start message, it will send a door unlock message to the door control system, and the vehicle will unlock normally. This avoids the inability to unlock the vehicle using the capacitive switch due to rain in heavy rain, improving user satisfaction.

[0072] If the vehicle is in a dormant state, the main operating procedures are as follows:

[0073] 1. When the capacitive switch system detects a significant increase in the baseline value (reaching a certain set value), and simultaneously the voltage value of the capacitive switch reads an increase, the capacitive switch will send a start message to the key system, at which point the key system will be activated.

[0074] 2. After receiving the start message, the key system identifies the key's location. If it determines the key is not inside the vehicle, it sends an image recognition message to the electronic exterior rearview mirror system and executes subsequent steps. If it determines the key is inside the vehicle, it does not execute subsequent steps. Simultaneously, the key system sends a special message to wake up the electronic exterior rearview mirror system to prevent accidental activation of other systems.

[0075] 3. After the electronic exterior rearview mirror is activated, it detects whether there is a hand near the door handle in the current state. The electronic exterior rearview mirror matches and identifies a designated area of ​​the selected image (the door handle of the capacitive switch; the selected area varies depending on the vehicle model and needs to be calibrated according to the actual vehicle model). The pixel value and mean variance value of the identified area will be different when there is a hand touching it and when there is no hand touching it. If the electronic exterior rearview mirror system determines that there is a person at the door handle, it sends a door unlock message to the capacitive switch. If the electronic exterior rearview mirror system detects that someone is touching the capacitive switch, it will send a door unlock message to the capacitive switch. If no person is detected, no message will be sent to avoid activating other controllers on the vehicle, reducing the vehicle's dark current, and preventing battery depletion.

[0076] 4. If the capacitive switch does not receive a door unlock message from the electronic exterior rearview mirror system within 2 seconds of sending the start message, the electronic exterior rearview mirror system determines that no person has been identified and will not send relevant information to the door control system. In this case, the door control system will not respond to the capacitive switch system to avoid false locking of the entire vehicle and false alarms inside the vehicle, which could lead to user complaints. If the capacitive switch receives the door unlock message from the electronic exterior rearview mirror system within 2 seconds of sending the start message, it will send a door unlock message to the door control system, waking it up and enabling the vehicle to unlock normally. This avoids the inability to unlock the vehicle using the capacitive switch due to rain in heavy rain, thus improving user satisfaction.

[0077] Example 4

[0078] The present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the capacitive switch control method described in the above technical solution.

[0079] Example 5

[0080] The present invention also provides an electronic device, comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the capacitive switch control method described above.

[0081] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0082] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0083] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0084] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0085] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

[0086] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A control method for a capacitor switch, characterized in that: Includes the following steps: Once the capacitive switch on any door detects a touch signal, an image of that door is captured. If the image of the car door indicates that someone has touched the capacitive switch of the door, the door will be unlocked; otherwise, the door will remain locked. The electronic exterior rearview mirror system acquires images of the car doors and determines whether anyone is touching the capacitive switches on the doors. When the capacitive switch detects a touch signal, if it does not receive a door unlock message within a set time during the current signal acquisition cycle, it will not forward the door unlock message. The process of determining whether a person has touched the capacitive switch of a car door based on the car door image includes: if the absolute value of the difference between the pixel value and the average variance value of the door handle area in the car door image and the pixel value and the average variance value of other areas is greater than a set value, then it is determined that a person has touched the capacitive switch of the car door; otherwise, it is determined that no one has touched the capacitive switch. The process of acquiring the door image includes: the electronic exterior rearview mirror system controls the electronic exterior rearview mirror corresponding to the capacitive switch that receives the touch signal to rotate to a set angle and take an image; the set area of ​​the captured image is marked as the door handle area.

2. The method according to claim 1, characterized in that: If the electronic exterior rearview mirror system determines that someone has touched the capacitive switch of the door, it generates a door unlock message and sends it to the capacitive switch; otherwise, it does not generate or send a door unlock message. The capacitive switch forwards the received door unlock message to the door control system. The door control system generates a door unlock control signal based on the received door unlock message to control the door unlocking.

3. The method according to claim 2, characterized in that: When the vehicle is in a dormant state, if the capacitive switch detects a touch signal, it will only wake up the electronic exterior rearview mirror system to obtain the door image and determine whether someone has touched the capacitive switch of the door. If the electronic exterior rearview mirror system determines that someone has touched the capacitive switch of the door, it will then wake up the door control system to unlock the door. After the door is opened, it will then wake up the other control systems of the vehicle.

4. The method according to claim 1, characterized in that: The process of determining whether the capacitive switch of the car door has detected a touch signal includes: if the baseline value detected by the capacitive switch reaches the set value, and the voltage value of the capacitive switch increases at the same time, then it is determined that the capacitive switch has detected a touch signal; otherwise, it is determined that the capacitive switch has not detected a touch signal.

5. The method according to claim 1, characterized in that: When the key is inside the vehicle, the door unlocking is performed using a control method that is not based on a capacitive switch.

6. The method according to claim 3, characterized in that: When the vehicle is in a dormant state, if the capacitive switch detects a touch signal, it first wakes up the key and identifies the key's location; if it determines that the key is not in the vehicle, it wakes up the electronic exterior rearview mirror system and executes subsequent steps; if it determines that the key is in the vehicle, it does not wake up the electronic exterior rearview mirror system and does not execute subsequent steps.

7. A control system for a capacitor switch, characterized in that: A control method for performing the capacitor switch according to any one of claims 1-6; This includes capacitive switches, door control systems, and electronic exterior mirror systems; The capacitive switches are installed in each vehicle door to detect touch signals; The electronic exterior rearview mirror system is used to acquire an image of the door when the capacitive switch of any door detects a touch signal; The electronic exterior rearview mirror system is also used to determine whether someone has touched the capacitive switch of the door based on the image of the door. If it is determined that someone has touched the capacitive switch of the door, a door unlock message is generated and sent to the capacitive switch; otherwise, no door unlock message is generated or sent. The capacitive switch forwards the received door unlock message to the door control system; The door control system is used to generate a door unlocking control signal based on the received door unlocking message, in order to control the door to unlock.

Images