Capacitive sensing identification method and system

Abstract

The invention belongs to the technical field of automobiles, and particularly relates to a capacitive sensing identification method and system. The capacitive sensing identification method comprises the following steps: starting a capacitive sensor, and judging whether a tail gate opening or closing instruction exists or not; and after the activation signal is acquired, judging whether the brightness of the ambient light is greater than the brightness of the projection lamp, if so, turning off the projection lamp and switching to the capacitive foot scanning identification model to judge the tail gate instruction, otherwise, turning on the projection lamp and switching to the capacitive foot kicking identification model to judge the tail gate instruction. Switching of multiple modes can be achieved, the sense of science and technology of the vehicle is improved, and the vehicle is more intelligent and user-friendly.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobiles, and particularly relates to a capacitance sensing and recognition method and system. Background Art

[0002] The development of automotive technology mainly focuses on directions such as travel safety, comfort and convenience, and intelligence. Control methods such as mechanical buttons and touch may not be intuitive or convenient in some scenarios, especially when frequent operations are required and both hands are inconvenient. The foot kick sensor is an electric tailgate induction product to improve the convenience of users. When the user carries a legal key and makes an effective kicking action within the sensor area, the tailgate can be opened or closed, thus realizing the function of automatically opening or closing the tailgate without contact operation by the user. The functionality, sensitivity and safety of the foot kick sensor are of great significance for the intelligent opening or closing of the tailgate and creating a better driving and riding space for users.

[0003] Existing capacitive foot kick devices mainly trigger the switch by sensing the foot movements of the human body. However, there is a lack of clear guidance on the operation area, and it may be difficult for users to accurately judge the position of the sensing area, resulting in difficulty in successfully triggering the foot movement, and the learning cost for users is very high. Summary of the Invention

[0004] Aiming at the technical problem that existing capacitive foot kick devices lack operation guidance, making it difficult for users to successfully trigger foot movements, the present invention aims to provide a capacitance sensing and recognition method and system.

[0005] To solve the aforementioned technical problems, a first aspect of the present invention provides a capacitance sensing and recognition method, and the capacitance sensing and recognition method includes:

[0006] Start the capacitive sensor and determine whether there is an instruction to open or close the tailgate;

[0007] After obtaining the activation signal, determine whether the ambient light brightness is greater than the projection light brightness. If it is greater, turn off the projection light and switch to the capacitive foot sweep recognition model to determine the tailgate instruction. Otherwise, turn on the projection light and switch to the capacitive foot kick recognition model to determine the tailgate instruction.

[0008] Optionally, in the capacitance sensing and recognition method as described above, after turning on the projection light, it is also determined whether the capacitance value detected by the capacitive sensor changes or the change is within a preset fluctuation range within a preset time threshold. If the capacitance value detected by the capacitive sensor does not change or the change is within the preset fluctuation range, turn off the projection light and switch to the capacitive foot sweep recognition model to determine the tailgate instruction.

[0009] Optionally, in the capacitive sensing and recognition method described above, the projection lamp is a projection lamp with several brightness levels. Before turning on the projection lamp, the corresponding brightness level is obtained according to the ambient light brightness, and the projection lamp is turned on at the corresponding brightness level.

[0010] Optionally, in the capacitive sensing and recognition method described above, when turning on or off the projection lamp, a gradual turn-on or gradual turn-off method is adopted.

[0011] Optionally, in the capacitive sensing and recognition method described above, when turning on the projection lamp, a gradual turn-on method is adopted, and the gradual turn-on effect of the projection lamp is consistent with the tailgate welcome lamp preset on the vehicle. When a person approaches the vehicle, the projection lamp and the tailgate welcome lamp are started simultaneously.

[0012] Optionally, in the capacitive sensing and recognition method described above, the projection lamp uses an LED.

[0013] Optionally, in the capacitive sensing and recognition method described above, the activation signal is sent by the body controller, and the activation signal includes at least one body signal among the key signal, system activation signal, light source signal, and vehicle unlock signal.

[0014] Optionally, in the capacitive sensing and recognition method described above, the activation signal is sent by the body controller, and the body controller has a wake-up mode. When the body controller switches to the wake-up mode, the body controller is allowed to send the activation signal.

[0015] Optionally, in the capacitive sensing and recognition method described above, after obtaining the vehicle sleep signal, the projection lamp is turned off, and the capacitive foot sweep recognition model is switched to judge the tailgate command.

[0016] Optionally, in the capacitive sensing and recognition method described above, the vehicle sleep signal is sent by the body controller, and the body controller has a vehicle sleep mode. When the body controller switches to the vehicle sleep mode, the body controller sends the vehicle sleep signal.

[0017] Optionally, in the capacitive sensing and recognition method described above, after obtaining the prohibition activation signal, the capacitive sensor is turned off, and the projection lamp is turned off.

[0018] Optionally, in the capacitive sensing and recognition method described above, the prohibition activation signal is sent by the body controller, and the body controller has a wake-up mode. When the body controller switches to the wake-up mode and receives the prohibition activation signal, the body controller sends the prohibition activation signal.

[0019] Optionally, in the capacitive sensing and recognition method described above, the capacitive sensor has two separated sensing antennas. After the two sensing antennas are arranged in the vehicle's Y direction, one of the sensing antennas is arranged below the other along the vehicle's Z direction, and one of the sensing antennas is arranged in front of the other along the vehicle's X direction.

[0020] Optionally, in the capacitive sensing and recognition method described above, both of the two sensing antennas are located inside the vehicle's rear bumper.

[0021] Optionally, in the capacitive sensing and recognition method described above, the capacitive sensor has two separated sensing antennas, namely a first sensing antenna and a second sensing antenna;

[0022] Both the capacitive foot sweep recognition model and the capacitive foot kick recognition model use the capacitive recognition model to judge the tailgate command. The capacitive recognition model includes:

[0023] When the capacitance value detected by the first sensing antenna is within a preset first capacitance range, it is defined as a signal S1 representing a proximity operation. When the capacitance value detected by the first sensing antenna is within a preset second capacitance range, it is defined as a signal S2 representing a contact operation. When the capacitance value detected by the second sensing antenna is within a preset third capacitance range, it is defined as a signal S3 representing a proximity operation. When the capacitance value detected by the second sensing antenna is within a preset fourth capacitance range, it is defined as a signal S4 representing a contact operation;

[0024] Receive the capacitance value detected by the first sensing antenna and the capacitance value detected by the second sensing antenna, and make the following judgments:

[0025] If after receiving signal S1, signal S3 is received successively within a duration t1, signal S2 is received within a duration t2, signal S2 is received within a duration t3, and signal S1 is received within a duration t4, then it is considered that a first trigger signal is generated;

[0026] If after receiving signal S3, signal S4 is received successively within a duration t5, signal S4 is received within a duration t6, and signal S3 is received within a duration t7, then it is considered that a second trigger signal is generated;

[0027] If the first trigger signal and the second trigger signal are respectively generated within a preset trigger time range, then it is considered that a target trigger signal indicating a human approaching action is generated, and the target trigger signal is sent to the body controller.

[0028] To solve the foregoing technical problems, a second aspect of the present invention provides a capacitive sensing and recognition system. The capacitive sensing and recognition system includes:

[0029] An ambient light sensor for detecting the ambient light brightness;

[0030] A capacitive sensor for detecting a capacitance value;

[0031] A projection lamp for displaying an induction area, and the projection lamp, the ambient light sensor, and the capacitive sensor are respectively installed at a preset position of the vehicle;

[0032] A main controller is respectively connected to the ambient light sensor, the capacitive sensor, the projection lamp, and a vehicle body controller. The main controller is built-in with a capacitive foot sweep recognition model and a capacitive foot kick recognition model. The main controller is used to determine whether there is a tailgate opening or closing instruction. When an activation signal is obtained, it is determined whether the ambient light brightness is greater than the projection lamp brightness. If it is greater, the projection lamp is turned off, and the capacitive foot sweep recognition model is switched to determine the tailgate instruction. Otherwise, the projection lamp is turned on, and the capacitive foot kick recognition model is switched to determine the tailgate instruction.

[0033] Optionally, in the capacitive induction recognition system as described above, the capacitive sensor has two mutually separated induction antennas. The two induction antennas are respectively connected to the main controller. The two induction antennas are arranged side by side in a preset direction. One of the induction antennas is located below the other induction antenna, and one of the induction antennas is located in front of the other induction antenna.

[0034] The positive and progressive effects of the present invention are as follows:

[0035] 1. The present invention switches the recognition mode and whether to turn on the projection lamp by judging whether the ambient light brightness is greater than the projection lamp brightness. The switching of multiple modes can support the detection of multiple actions such as foot kicking, foot sweeping, and diagonal kicking at the same time, which not only improves the technological sense of the vehicle, but also makes the vehicle more intelligent and user-friendly. When switching to the capacitive foot kick recognition model, the projection lamp is turned on. The turning on of the projection lamp provides a light area guidance for the present invention. The intuitive light area guidance reduces the operation difficulty and the number of attempts of the user, improves the user satisfaction, and greatly enhances the user experience.

[0036] 2. To reduce power consumption, the present invention sets a capacitance scanning time. When the capacitance value detected by the capacitive sensor does not change or the change is within a preset fluctuation range within a preset time threshold, it is determined that the user has no current demand for opening or closing the tailgate, the projection lamp is turned off, and the capacitive foot sweep recognition model is turned on.

[0037] 3. The present invention takes into account that it is difficult to accurately identify the kicking area in strong light environments, or that the projection is too bright and causes discomfort in low light environments, making it difficult for users to accurately locate, affecting the vehicle use experience. The projection light has an environmental adaption function, that is, it automatically adjusts the brightness level of the projection light according to the ambient light brightness. Through the lighting area guidance, the foot sensing area can be quickly and accurately found under different ambient brightnesses, greatly improving the operation convenience.

[0038] 4. The projection light of the present invention has a gradual change function when it is turned on and off, and is consistent with the tailgate welcome light, which can further enhance the welcome effect. The projection light of the present invention uses low-power LEDs, and the power consumption in the standby state is extremely low, meeting the requirements of energy conservation and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Referring to the accompanying drawings, the disclosure of the present invention will become more apparent. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the figures:

[0040] Figure 1 is an identification logic diagram of the present invention;

[0041] Figure 2 (a), (b) and (c) are schematic diagrams of the Y-direction installation positions of the capacitive sensors of the present invention;

[0042] Figure 3 is a schematic diagram of the X-direction and Z-direction installation positions of the capacitive sensors of the present invention;

[0043] Figure 4 is a detection waveform diagram of the two induction antennas of the capacitive sensor of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] The following describes the embodiments of the present invention through specific specific examples. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0045] It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0046] In the description of the present invention, it should be noted that for orientation terms, such as the terms "outer side", "middle section", "inner", "outer", etc., indicating the orientation and position relationship are based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present invention.

[0047] In addition, terms such as "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more such features. In the description of the present invention, the meanings of "several" and "a number of" are two or more, unless otherwise specifically defined.

[0048] An embodiment of the present invention provides a capacitance sensing and recognition method, which includes the following steps:

[0049] S1, activate the capacitive sensor and determine whether there is an instruction to open or close the tailgate.

[0050] S2, when an activation signal is obtained, determine whether the ambient light brightness is greater than the projection light brightness. If the ambient light brightness is greater than the projection light brightness, turn off the projection light and switch to the capacitive foot sweep recognition model to judge the tailgate instruction. If the ambient light brightness is not greater than the projection light brightness, turn on the projection light and switch to the capacitive foot kick recognition model to judge the tailgate instruction.

[0051] With the projection light turned on, the present invention has a light area guide, and the intuitive light area guide reduces the user's operation difficulty and the number of attempts, improves user satisfaction, and greatly enhances the user experience. When the projection light is turned off, that is, when there is no light area guide, using the capacitive foot sweep recognition model to recognize the user's action has a higher recognition success rate than the capacitive foot kick recognition model.

[0052] When the present invention does not obtain the activation signal, the model used to judge whether there is an instruction to open or close the tailgate follows the historical model, and at this time, the comparison between the ambient light brightness and the projection light brightness and the model switching work are not carried out.

[0053] The activation signal in step S2 is usually sent by the body controller, which is an inherent controller of the vehicle. Only after obtaining the activation signal, the judgment work of this step is started.

[0054] The ambient light brightness in step S2 can be obtained through an ambient light sensor installed on the vehicle. The ambient light sensor is preferably set at a position close to the projection light to detect the ambient light brightness near the projection light.

[0055] The projection light brightness in step S2 can be pre-stored in a preset storage location, and the projection light brightness parameter can be modified and adjusted according to the different models of the installed projection lights. When the projection light is a projection light with several brightness levels, the projection light brightness is preferably the light brightness corresponding to the highest brightness level, that is to say, the projection light brightness is the highest value of the light brightness that the projection light can emit.

[0056] The capacitive foot sweep recognition model and the capacitive foot kick recognition model in step S2 can directly adopt the models in the prior art.

[0057] In some embodiments, after the projection lamp is turned on, it is also determined whether the capacitance value detected by the capacitive sensor changes or the change falls within a preset fluctuation range within a preset time threshold. If the capacitance value detected by the capacitive sensor does not change or the change falls within the preset fluctuation range, the projection lamp is turned off and switched to the capacitive foot sweep recognition model to judge the tailgate command.

[0058] This embodiment provides a capacitance scanning time limit. When the capacitance does not change or the change falls within the preset fluctuation range within the preset time threshold, that is, the user does not perform any action within the detection area of the capacitive sensor within the preset time threshold, it is determined that the user has no current need to open or close the tailgate. The projection lamp is turned off and the capacitive foot sweep recognition model is turned on to further achieve the purpose of reducing power consumption.

[0059] The preset fluctuation range in this embodiment is a preset capacitance value range to allow for slight detection errors of the capacitive sensor.

[0060] In some embodiments, the projection lamp is a projection lamp with several brightness levels. Before turning on the projection lamp, the corresponding brightness level is obtained according to the ambient light brightness, and the projection lamp is turned on according to the corresponding brightness level.

[0061] This embodiment can pre-map the brightness levels to the ambient light brightness. That is to say, different brightness levels correspond to different ambient light brightness ranges. Usually, the light brightness corresponding to the brightness level is greater than the corresponding ambient light brightness, so that the indicated area projected by the projection lamp can be displayed more clearly.

[0062] This embodiment can guide through the light area, so that users can quickly and accurately find the foot sensing area under different ambient brightnesses.

[0063] In some embodiments, when turning on or off the projection lamp, a gradual turn-on or gradual turn-off method is adopted.

[0064] In some embodiments, when turning on the projection lamp, a gradual turn-on method is adopted. The gradual effect when the projection lamp is turned on is consistent with the tailgate welcome lamp preset on the vehicle. When a person approaches the vehicle, the projection lamp and the tailgate welcome lamp are started simultaneously to further enhance the welcome effect.

[0065] In this embodiment, the capacitance value detected by the capacitive sensor can be used to determine whether a human body approaches the vehicle. When a human body approaches the vehicle, the capacitance value detected by the capacitive sensor changes. Then, it can be determined whether a preset capacitance value change threshold is triggered. When the preset capacitance value change threshold is triggered, it is considered that there is a situation where a human body approaches, and the projection lamp is controlled to gradually turn on, and the gradual change effect is consistent with the tailgate welcome lamp. That is to say, the present invention can not only turn on the projection lamp by obtaining the activation signal and the light brightness judgment, but also turn on the projection lamp by sensing whether a human body approaches the vehicle.

[0066] In another embodiment, when a human body approaches the vehicle, the projection lamp is turned on, and preferably, the projection lamp is gradually turned on. The method for judging whether a human body approaches the vehicle can still be the method of using the capacitance value detected by the above capacitive sensor to determine whether a human body approaches the vehicle. At this time, the projection lamp may not be consistent with the tailgate welcome lamp, that is, an independent opening method of the projection lamp when a human body approaches can be realized. This method is applicable to the situation where it is not necessary to be consistent with the tailgate welcome lamp or the vehicle is not equipped with a tailgate welcome lamp.

[0067] Of course, after the projection lamp is turned on or gradually turned on, the projection lamp can be turned off in the following way: if no change in capacitance occurs or the change occurs within a preset fluctuation range within a preset time threshold, that is, the user does not perform any action within the detection area of the capacitive sensor within the preset time threshold, it is determined that the user has no current demand for opening or closing the tailgate, and the projection lamp is turned off to further achieve the purpose of reducing power consumption.

[0068] In some embodiments, the projection lamp uses an LED, and the power consumption in the standby state of the LED is extremely low, meeting the requirements of energy conservation and environmental protection.

[0069] In some embodiments, the activation signal is sent by the body controller, and the activation signal includes at least one body signal among the key signal, the system activation signal, the light source signal, and the vehicle unlock signal.

[0070] Whether the capacitance induction recognition method of the present invention corresponds to the activation of the system is determined by the body controller. The system needs to meet the body control logic state before entering the activation state to perform the judgment between the ambient light brightness and the projection lamp light brightness and the model switching operation. By obtaining any one of the above body signals, it is considered that the system has been activated.

[0071] In some embodiments, the activation signal is sent by the body controller, and the body controller has a wake-up mode. When the body controller switches to the wake-up mode, the body controller is allowed to send the activation signal.

[0072] Normally, the body controller of a vehicle has a vehicle sleep mode and a wake-up mode. For example, when the vehicle is locked, the system is considered to be in the vehicle sleep mode, and at this time, the vehicle is in a low-power mode. When any body signal is initiated, it switches to the wake-up mode. Only in the wake-up mode can the body controller send an activation signal.

[0073] In some embodiments, after obtaining the vehicle sleep signal, the projection lamp is turned off, and the capacitive foot sweep recognition model is switched to determine the tailgate command.

[0074] When the vehicle sleep signal is obtained, the system is considered to be in the vehicle sleep mode. At this time, the vehicle is in a low-power mode, and at this time, the judgment on whether the ambient light brightness is greater than the projection lamp brightness is not performed. Regardless of whether the ambient light brightness is greater than the projection lamp brightness, the projection lamp needs to be turned off, and the capacitive foot sweep recognition model is switched to determine the tailgate command.

[0075] In some embodiments, the vehicle sleep signal is sent by the body controller, and the body controller has a vehicle sleep mode. When the body controller switches to the vehicle sleep mode, the body controller sends the vehicle sleep signal.

[0076] In some embodiments, after obtaining the inhibition activation signal, the capacitive sensor is turned off and the projection lamp is turned off.

[0077] When the inhibition activation signal is obtained, the system is considered to be in the sleep silent mode. In this mode, the radio frequency of the induction antenna of the capacitive sensor is turned off, the capacitance detection work is not performed, and the projection lamp is also turned off.

[0078] This mode is usually used to prevent mis-triggering, such as in the rain mode or the car wash mode.

[0079] In some embodiments, the inhibition activation signal is sent by the body controller, and the body controller has a wake-up mode. When the body controller switches to the wake-up mode and receives the inhibition activation signal, the body controller sends the inhibition activation signal.

[0080] The prerequisite for the sleep silent mode is that the body controller is in the wake-up mode. When the body controller obtains the inhibition activation signal, the inhibition activation signal is sent to the main controller of this system.

[0081] The inhibition activation signal is another body signal different from the activation signal. The acquisition of the inhibition activation signal can be provided by the user using the human-machine interaction device, such as the user's operation through the car touch screen / button.

[0082] In some embodiments, the capacitive sensing recognition method includes:

[0083] Refer to Figure 1When the body controller is in the vehicle sleep mode (LIN Sleep), it obtains the vehicle sleep signal, considers the system to be in a low-power state, turns off the projection lamp, and switches to using the capacitive foot sweep recognition model to judge the tailgate command.

[0084] Refer to Figure 1 When the body controller is in the wake-up mode (LIN Wake up), it obtains the activation signal, considers the system to be activated, and judges whether the current ambient light brightness is greater than the projection lamp brightness. If the ambient light brightness is greater than the projection lamp brightness, turn off the projection lamp and switch to using the capacitive foot sweep recognition model to judge the tailgate command. If the ambient light brightness is not greater than the projection lamp brightness, turn on the projection lamp and switch to using the capacitive foot kick recognition model to judge the tailgate command. When turning on the projection lamp, first obtain the corresponding brightness level according to the ambient light brightness, and turn on the projection lamp according to the corresponding brightness level.

[0085] Refer to Figure 1 After judging that the ambient light brightness is not greater than the projection lamp brightness, if the capacitance value detected by the capacitive sensor does not change or the change is within the preset fluctuation range within the preset time threshold, turn off the projection lamp and switch to using the capacitive foot sweep recognition model to judge the tailgate command. If the capacitance value detected by the capacitive sensor changes or the change is greater than the preset fluctuation range within the preset time threshold, it is considered that there is a user action behavior, the projection lamp remains on, and continue to use the capacitive foot kick recognition model to judge the tailgate command.

[0086] Refer to Figure 1 When the body controller is in the wake-up mode (LIN Wake up), it obtains the inhibition activation signal, considers the system activation to be inhibited, turns off the radio frequency of the induction antenna of the capacitive sensor, and turns off the projection lamp.

[0087] Finally, according to the judgment result of the capacitive foot sweep recognition model or the capacitive foot kick recognition model, determine whether to open or close the electric tailgate.

[0088] In some embodiments, the capacitive sensor has two mutually separated induction antennas, namely the first induction antenna 11 and the second induction antenna 12. Refer to Figure 2 In (a), (b), and (c), first arrange the two induction antennas along the vehicle Y direction. Among them, Figure 2 The elliptical area in (a) represents the preferred arrangement position when the induction antennas are arranged. Figure 2 The cylinders in (b) and (c) represent that after the two induction antennas are horizontally arranged along the vehicle Y direction, the two induction antennas radiate downward to sense and identify the capacitance change of the foot. Refer to Figure 3, then set one of the induction antennas below the other along the vehicle's Z-axis, and set one of the induction antennas in front of the other along the vehicle's X-axis. Of course, the order of setting in the Z-axis and X-axis can be interchanged. That is to say, one of the induction antennas can be set in front of the other along the vehicle's X-axis first, and then one of the induction antennas can be set below the other along the vehicle's Z-axis.

[0089] As Figure 3 shown, the second induction antenna 12 is located in front of and below the first induction antenna 11. The second induction antenna 12 can also be located in front of and above, behind and above, or behind and below the first induction antenna 11. Of course, their positions can also be interchanged. That is to say, the first induction antenna 11 can be located in front of and below, in front of and above, behind and above, or behind and below the second induction antenna 12.

[0090] The capacitive sensor of this embodiment is provided with two induction antennas and defines the positional relationship between the two induction antennas, providing a reliable and stable data source for the subsequent capacitive foot kick recognition model to judge the tailgate command.

[0091] In some embodiments, both induction antennas are located inside the vehicle's rear bumper.

[0092] In some embodiments, the capacitive sensor includes an induction chip and one or several induction antennas. The induction chip is connected to the induction chip, and the induction chip has a signal processing circuit, which is used to amplify, filter, and digitize the capacitance value for transmission to the main controller to judge whether there is a command to open or close the tailgate.

[0093] In some embodiments, the capacitive foot sweep recognition model and the capacitive foot kick recognition model of the present invention can respectively adopt the models in the prior art, or can adopt the capacitive recognition model designed as follows. This capacitive recognition model can support the detection of various actions such as foot kick, foot sweep, and diagonal kick, not only enhancing the technological sense of the vehicle, but also making the vehicle more intelligent and user-friendly.

[0094] The capacitive sensor has two mutually separated induction antennas, namely the first induction antenna and the second induction antenna.

[0095] Both the capacitive foot sweep recognition model and the capacitive foot kick recognition model use the capacitive recognition model to judge the tailgate command. The capacitive recognition model includes:

[0096] When the capacitance value detected by the first induction antenna is within the preset first capacitance range, it is defined as the signal S1 indicating a proximity operation. When the capacitance value detected by the first induction antenna is within the preset second capacitance range, it is defined as the signal S2 indicating a contact operation. When the capacitance value detected by the second induction antenna is within the preset third capacitance range, it is defined as the signal S3 indicating a proximity operation. When the capacitance value detected by the second induction antenna is within the preset fourth capacitance range, it is defined as the signal S4 indicating a contact operation.

[0097] Receive the capacitance values detected by the first induction antenna and the second induction antenna, and perform the following judgment logic:

[0098] If after receiving the signal S1, the signal S3 is received successively within the duration t1, the signal S2 is received within the duration t2, the signal S2 is received within the duration t3, and the signal S1 is received within the duration t4, then it is considered that the first trigger signal is generated.

[0099] If after receiving the signal S3, the signal S4 is received successively within the duration t5, the signal S4 is received within the duration t6, and the signal S3 is received within the duration t7, then it is considered that the second trigger signal is generated.

[0100] If the first trigger signal and the second trigger signal are respectively generated within the preset trigger time range, then it is considered that the target trigger signal indicating the human body's proximity action is generated, and the target trigger signal is sent to the vehicle body controller.

[0101] The two induction antennas in this embodiment respectively have detection channels. In this embodiment, the target trigger signal is triggered only when the capacitance values detected by the first induction antenna and the second induction antenna both meet the above judgment logic within the preset trigger time range.

[0102] In this embodiment, since both the capacitive foot sweep recognition model and the capacitive foot kick recognition model use the capacitive recognition model to judge the tailgate command, when judging whether the ambient light brightness is greater than the projection light brightness, regardless of whether it is greater or not, there is no need to switch the model, and only the projection light needs to be turned on or off according to the judgment result. That is to say:

[0103] Start the capacitive sensor, and use the capacitive recognition model of this embodiment to judge whether there is a tailgate opening or closing command; when the activation signal is obtained, judge whether the ambient light brightness is greater than the projection light brightness. If it is greater, turn off the projection light, otherwise, turn on the projection light.

[0104] In this embodiment, the preset first capacitance range, the preset second capacitance range, the preset third capacitance range, and the preset fourth capacitance range are all pre-set capacitance value ranges, which can be set according to the product layout and the shape of the vehicle's rear bumper. For example Figure 4As shown, the waveform graph on the upper side is the capacitance value detected by the first induction antenna, and the waveform graph on the lower side is the capacitance value detected by the second induction antenna. Among them, the abscissa X-axis is the time parameter (s), and the ordinate Y-axis is the capacitance value parameter (μF) after processing. From Figure 4 it can be seen that the first induction antenna triggers the proximity operation first and is closer to the human body than the second induction antenna. Therefore, when arranging the two induction antennas, the first induction antenna is located above or below the rear side of the second induction antenna, as Figure 3 shown, the first induction antenna 11 is located above the rear side of the second induction antenna 12.

[0105] In this embodiment, the duration t1, duration t2, duration t3, duration t4, duration t5, duration t6, and duration t7 are all preset time threshold ranges, which can be set according to the product layout and the shape of the vehicle rear bumper.

[0106] This embodiment allows a certain time difference when performing logical judgments on the capacitance values obtained from the first induction antenna and the second induction antenna respectively by setting a preset trigger time range. The preset trigger time range is a preset time threshold range, which can be set according to the product layout and the shape of the vehicle rear bumper.

[0107] The target trigger signal in this embodiment is the presence of an instruction to open or close the tailgate. As for whether to open or close, it is the overall vehicle tailgate processing logic of the body controller. For example, when the target trigger signal is triggered in the tailgate closed state, the tailgate opening action is executed; when the target trigger signal is triggered during the tailgate opening process, the tailgate hovering action is executed; when the target trigger signal is triggered in the tailgate fully opened state, the tailgate closing action is executed.

[0108] In some embodiments, when performing logical judgments on the capacitance values obtained from the first induction antenna and the second induction antenna respectively, parallel or concurrent operations can be adopted.

[0109] The embodiment of the present invention also provides a capacitance induction recognition system, which includes an ambient light sensor, a capacitive sensor, a projection lamp, and a main controller. Among them, the projection lamp, the ambient light sensor, and the capacitive sensor form a device assembly, and the device assembly is installed at a preset position of the vehicle.

[0110] The ambient light sensor is used to detect the ambient light brightness. The ambient light sensor has significant differences for different ambient light brightnesses. When the ambient light sensor (i.e., the light sensor) is in different environments such as indoors, under strong light, and with the photosensitive surface covered, significant differences are shown. These significant differences can determine whether the ambient light brightness is greater than the projection lamp brightness. The capacitive sensor is used to detect the capacitance value. The projection lamp is used to display the induction area.

[0111] The main controller is respectively connected to an ambient light sensor, a capacitive sensor, a projection lamp, and a vehicle body controller. The main controller is built-in with a capacitive foot sweep recognition model and a capacitive foot kick recognition model. The main controller is used to determine whether there is an instruction to open or close the tailgate. When an activation signal is obtained, it determines whether the ambient light brightness is greater than the projection lamp brightness. If it is greater, the projection lamp is turned off, and the capacitive foot sweep recognition model is switched to judge the tailgate instruction. Otherwise, the projection lamp is turned on, and the capacitive foot kick recognition model is switched to judge the tailgate instruction.

[0112] In some embodiments, the device assembly is mounted on the inner side of the rear bumper of the vehicle through a mounting bracket.

[0113] In some embodiments, the capacitive sensor may be built-in with one or two induction antennas.

[0114] When the capacitive sensor has two spaced-apart induction antennas, the two induction antennas are respectively connected to the main controller. Referring to Figure 2 and Figure 3 , the two induction antennas are arranged side by side in a preset direction. One of the induction antennas is located below the other, and one of the induction antennas is located in front of the other.

[0115] In this embodiment, since the two induction antennas are staggered in position in both the X direction and the Z direction, the line connecting the two is usually not parallel to the vehicle's Y direction, but intersects, and the intersection angle is small. This angle depends on the position distances in the X direction and the Z direction of the two. The line connecting the two preferably intersects the vehicle's Y direction at an acute angle in space.

[0116] The present invention has been described in detail above in conjunction with the embodiments with the accompanying drawings. Those of ordinary skill in the art can make various variations to the present invention according to the above description. Therefore, some details in the embodiments should not constitute a limitation to the present invention, and the present invention will take the scope defined by the appended claims as the protection scope.

Claims

1. A capacitive sensing and recognition method, characterized in that, The capacitance sensing and recognition method includes: Activating a capacitive sensor to determine whether there is an instruction to open or close the tailgate; After obtaining an activation signal, determining whether the ambient light brightness is greater than the projection light brightness. If it is greater, turn off the projection light and switch to a capacitive foot sweep recognition model to determine the tailgate instruction. Otherwise, turn on the projection light and switch to a capacitive foot kick recognition model to determine the tailgate instruction.

2. The capacitive induction recognition method according to claim 1, wherein After turning on the projection light, it is also determined whether the capacitance value detected by the capacitive sensor changes or the change is within a preset fluctuation range within a preset time threshold. If the capacitance value detected by the capacitive sensor does not change or the change is within the preset fluctuation range, turn off the projection light and switch to a capacitive foot sweep recognition model to determine the tailgate instruction.

3. The capacitive sensing and identification method according to claim 1, characterized in that, The projection light is a projection light with several brightness levels. Before turning on the projection light, obtain the corresponding brightness level according to the ambient light brightness and turn on the projection light according to the corresponding brightness level; and / or, when turning on or off the projection light, use a gradual turn-on or gradual turn-off method; and / or, when turning on the projection light, use a gradual turn-on method, and the gradual effect when the projection light is turned on is consistent with the tailgate welcome light preset on the vehicle. When a person approaches the vehicle, the projection light and the tailgate welcome light are turned on simultaneously; and / or, the projection light uses an LED.

4. The capacitive sensing and identification method according to claim 1, wherein The activation signal is sent by a body controller, and the activation signal includes at least one body signal among a key signal, a system activation signal, a light source signal, and a vehicle unlock signal; and / or, the activation signal is sent by a body controller, and the body controller has a wake-up mode. When the body controller switches to the wake-up mode, the body controller is allowed to send the activation signal; and / or, after obtaining a vehicle sleep signal, turn off the projection light and switch to a capacitive foot sweep recognition model to determine the tailgate instruction; and / or, after obtaining a prohibit activation signal, turn off the capacitive sensor and turn off the projection light.

5. The capacitive sensing and recognition method according to claim 4, wherein The vehicle sleep signal is sent by a body controller, and the body controller has a vehicle sleep mode. When the body controller switches to the vehicle sleep mode, the body controller sends the vehicle sleep signal; and / or, the prohibit activation signal is sent by a body controller, and the body controller has a wake-up mode. When the body controller switches to the wake-up mode and receives the prohibit activation signal, the body controller sends the prohibit activation signal.

6. The capacitive induction recognition method according to claim 1, wherein, The capacitive sensor has two separated induction antennas. After the two induction antennas are arranged along the vehicle's Y direction, one of the induction antennas is arranged below the other along the vehicle's Z direction, and one of the induction antennas is arranged in front of the other along the vehicle's X direction.

7. The capacitive sensing and recognition method according to claim 6, characterized in that, Both of the two induction antennas are located inside the vehicle's rear bumper.

8. The capacitance sensing and recognition method according to any one of claims 1 to 7, characterized in that The capacitive sensor has two separated induction antennas, namely a first induction antenna and a second induction antenna; Both the capacitive foot sweep recognition model and the capacitive foot kick recognition model use a capacitive recognition model to judge the tailgate command. The capacitive recognition model includes: When the capacitance value detected by the first induction antenna is within a preset first capacitance range, it is defined as a signal S1 indicating a proximity operation. When the capacitance value detected by the first induction antenna is within a preset second capacitance range, it is defined as a signal S2 indicating a contact operation. When the capacitance value detected by the second induction antenna is within a preset third capacitance range, it is defined as a signal S3 indicating a proximity operation. When the capacitance value detected by the second induction antenna is within a preset fourth capacitance range, it is defined as a signal S4 indicating a contact operation; Receive the capacitance value detected by the first induction antenna and the capacitance value detected by the second induction antenna, and make the following judgments: If after receiving signal S1, signal S3 is received in sequence within a duration t1, signal S2 is received within a duration t2, signal S2 is received within a duration t3, and signal S1 is received within a duration t4, then it is considered that a first trigger signal is generated; If after receiving signal S3, signal S4 is received in sequence within a duration t5, signal S4 is received within a duration t6, and signal S3 is received within a duration t7, then it is considered that a second trigger signal is generated; If the first trigger signal and the second trigger signal are respectively generated within a preset trigger time range, then it is considered that a target trigger signal indicating a human body proximity action is generated, and the target trigger signal is sent to the body controller.

9. A capacitive induction identification system, characterized in that, The capacitive induction recognition system includes: An ambient light sensor for detecting the ambient light brightness; A capacitive sensor for detecting the capacitance value; A projection lamp for displaying the induction area. The projection lamp, the ambient light sensor, and the capacitive sensor are respectively installed at preset positions on the vehicle; A main controller. The main controller is respectively connected to the ambient light sensor, the capacitive sensor, the projection lamp, and the body controller. The main controller is built-in with a capacitive foot sweep recognition model and a capacitive foot kick recognition model. The main controller is used to judge whether there is a tailgate opening or closing command. When an activation signal is obtained, it judges whether the ambient light brightness is greater than the projection lamp brightness. If it is greater, the projection lamp is turned off and switched to the capacitive foot sweep recognition model to judge the tailgate command. Otherwise, the projection lamp is turned on and switched to the capacitive foot kick recognition model to judge the tailgate command.

10. The capacitive induction identification system according to claim 9, characterized in that, The capacitive sensor has two mutually separated induction antennas. The two induction antennas are respectively connected to the main controller. The two induction antennas are arranged side by side in a preset direction. One of the induction antennas is located below the other induction antenna, and one of the induction antennas is located in front of the other induction antenna.

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