CN115437017A - Intelligent false touch prevention sensor, sensing system and door handle sensing device - Google Patents
Intelligent false touch prevention sensor, sensing system and door handle sensing device Download PDFInfo
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- CN115437017A CN115437017A CN202211022116.6A CN202211022116A CN115437017A CN 115437017 A CN115437017 A CN 115437017A CN 202211022116 A CN202211022116 A CN 202211022116A CN 115437017 A CN115437017 A CN 115437017A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/088—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices operating with electric fields
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/70—Power-operated mechanisms for wings with automatic actuation
- E05F15/73—Power-operated mechanisms for wings with automatic actuation responsive to movement or presence of persons or objects
- E05F15/75—Power-operated mechanisms for wings with automatic actuation responsive to movement or presence of persons or objects responsive to the weight or other physical contact of a person or object
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Abstract
The invention discloses an intelligent false touch prevention sensor, a sensing system and a doorknob sensing device, wherein the sensor comprises a substrate, the front surface of the substrate is provided with a sensing area and a dead zone positioned outside the sensing area, the sensing area is provided with a main sensor for detecting a touch signal, the dead zone is provided with an auxiliary sensor, and a gap is formed between the main sensor and the auxiliary sensor; the auxiliary sensor is synchronous with the driving wave of the main sensor, so that the main sensor and the auxiliary sensor synchronously emit detection electric fields and respectively output corresponding capacitance signals; through above-mentioned technical scheme, need not the detection duration that the extension detected touch signal, can filter because the influence that the water droplet triggers to induction system mistake to effectively promote to use and experience the sense.
Description
Technical Field
The invention relates to the technical field of induction touch of automobile door handles, in particular to an intelligent false touch prevention sensor, an induction system and an automobile door handle induction device.
Background
With the development of automobile intelligent technology, the keyless entry function is more and more popular. For the keyless entry system at present, the Bluetooth pairing is generally performed firstly, after the pairing is successful, when a user approaches the vehicle and contacts a vehicle door handle, an induction touch system on the vehicle door handle sends a trigger signal, and the vehicle door is opened automatically. Inductive touch systems on vehicle door handles typically employ a capacitive primary sensor, which is a proximity sensor for detecting objects such as liquids or solids without any physical contact. To detect these objects, the capacitive sensor generates an electric field from the sensing end of the sensor. Any object that can interrupt the electric field can be detected by the sensor. Solid materials that can be detected by capacitive sensors are paper, plastic, glass, cloth and wood. The liquid detectable by the capacitive sensor is oil, paint, water, etc.
Because the size of door handle is limited for the size of touch-sensitive chip is smaller, like this, when rainy day has the water droplet to drip at the response region of door handle and when the border of response region is gathered, because water also belongs to capacitive sensor's detection object, consequently cause the frequent false triggering of touch-sensitive chip easily, in order to avoid this situation, often filter the false triggering signal through extension check-out time now, but can lead to touch response time longer like this, bring not good experience effect for the user.
Disclosure of Invention
The present invention is directed to solve the above problems and to provide an intelligent anti-false-touch sensor, an induction system and a door handle induction device, which can effectively prevent false triggering caused by water and have a fast trigger response.
In order to achieve the purpose, the invention discloses an intelligent false touch prevention sensor which comprises a substrate, wherein the front surface of the substrate is provided with a sensing area and a dead zone positioned outside the sensing area, the sensing area is provided with a main sensor used for detecting a touch signal, the dead zone is provided with an auxiliary sensor, and a gap is formed between the main sensor and the auxiliary sensor; the auxiliary sensor is synchronous with the driving wave of the main sensor, so that the main sensor and the auxiliary sensor synchronously emit detection electric fields and respectively output corresponding capacitance signals.
Preferably, the auxiliary sensor surrounds the main sensor, and a diameter of a space between the auxiliary sensor and the main sensor is greater than or equal to 1mm.
Preferably, the auxiliary sensor is a metal grid laid in the vacant area.
Preferably, the density of the metal ribs of the metal grid is 25% -45%.
Preferably, a metal shielding net is arranged on the back surface of the substrate.
The invention also discloses an induction system, which comprises an inductor and an induction processor, wherein the inductor comprises a substrate, the front surface of the substrate is provided with an induction area and a dead zone positioned outside the induction area, the induction area is provided with a main sensor used for detecting touch signals, the dead zone is provided with an auxiliary sensor, and a gap is formed between the main sensor and the auxiliary sensor; the auxiliary sensor is synchronous with the driving wave of the main sensor, so that the main sensor and the auxiliary sensor synchronously emit detection electric fields and respectively output corresponding capacitance signals; the induction processor is electrically connected with the auxiliary sensor and the main sensor, and is used for driving the auxiliary sensor and the main sensor to work so as to generate a real-time sampling value according to a comprehensive signal fed back by the main sensor and the auxiliary sensor and select whether to output a trigger signal according to the real-time sampling value.
Preferably, the auxiliary sensor surrounds the main sensor, and the distance between the auxiliary sensor and the main sensor is greater than or equal to 1mm.
Preferably, a metal shielding net is arranged on the back surface of the substrate.
Preferably, the sensing processor includes a first signal port outputting a synchronous driving signal, a second signal port, a first detection capacitor and a second detection capacitor, the first detection capacitor is configured to generate a corresponding capacitance value according to an electric field change of the main sensor, the second detection capacitor is configured to generate a corresponding capacitance value according to an electric field change of the auxiliary sensor, two ends of the first detection capacitor are electrically connected between the first signal port and the second signal port, and a positive terminal of the first detection capacitor is electrically connected to the first signal terminal; the second detection capacitor is electrically connected between the second signal port and the ground; and the sensing processor generates the real-time sampling value according to the capacitance variation of the first detection capacitor and the capacitance variation of the second detection capacitor.
Preferably, the sensing processor further configures a reference value for the real-time sampling value, and outputs a trigger signal when a difference between the real-time sampling value and the reference value exceeds a trigger threshold at any time within a continuous time period.
Preferably, the sensing processor further generates a noise band based on the current reference value, the noise band including an upper limit value larger than the reference value and a lower limit value smaller than the reference value, and when a characteristic sample value at any time within a continuous time period is outside the noise band, the reference value is adjusted so that the characteristic sample value is within the noise band, and the characteristic sample value is the real-time sample value whose difference with the current reference value is within a preset range.
The invention also discloses a door handle sensing device, which comprises a handle shell, wherein the handle shell is provided with the sensing system.
Preferably, the handle casing comprises a bottom casing and a face cover, and the bottom casing is provided with a mounting groove for accommodating the induction system; the induction system is arranged on a base body, a supporting step is arranged on the bottom wall of the mounting groove, a gap is formed between the base body and the bottom wall of the mounting groove through the supporting step, and a channel communicated with the gap and an external space is further arranged on the mounting groove.
Preferably, a hydrophobic elastic insulating medium layer is filled between the inductor and the surface cover, so that the inductor and the surface cover are attached seamlessly.
Compared with the prior art, in the technical scheme of the invention, the induction system installed in the automobile door handle comprises the inductor and the processor, the inductor comprises the main sensor and the auxiliary sensor positioned outside the main sensor, and after the inductor is assembled, the auxiliary sensor is also provided with the driving wave synchronous with the main sensor, so that when water drops drop on the automobile door handle and are opposite to the induction area and the dead area of the inductor, the influence of the capacitance fed back by the auxiliary sensor is neutralized and the influence of the water drops on the main sensor independently, so that the interference of the water drops is filtered out from a real-time sampling value output by the induction processor; therefore, according to the technical scheme, the detection time for detecting the touch signal is not required to be prolonged, the influence of water drops on false triggering of the induction system can be filtered, and the use experience is effectively improved.
Drawings
Fig. 1 is a schematic front view of an inductor according to an embodiment of the present invention.
Fig. 2 is a schematic back view of an inductor according to an embodiment of the present invention.
Fig. 3 is a connection structure diagram of the sensor and the sensing processor according to the embodiment of the invention.
Fig. 4 is a diagram illustrating an internal circuit of an induction processor according to an embodiment of the present invention.
Fig. 5 is a three-dimensional structure diagram of a door handle sensing device in an embodiment of the invention.
Fig. 6 is an exploded view of fig. 5.
Fig. 7 is a perspective view of the bottom case of fig. 5.
Detailed Description
In order to explain the technical contents, structural features, objects and effects of the present invention in detail, the following description is made in conjunction with the embodiments and the accompanying drawings.
The embodiment discloses an intelligent anti-false touch sensor, as shown in fig. 1 to 4, the sensor includes a sensor 10 and a sensing processor 11 electrically connected to the sensor 10, the sensor 10 collects data based on a capacitance variation, and the sensing processor 11 is configured to process the data collected by the sensor 10 and output a trigger signal. The sensor 10 in this embodiment includes a substrate 100, and a sensing area 101 and a vacant area 102 located outside the sensing area 101 are disposed on a front surface of the substrate 100. The sensing region 101 is provided with a main sensor 103 for detecting a touch signal, and the empty region 102 is provided with an auxiliary sensor 104 with a gap d between the main sensor 103 and the auxiliary sensor 104. The auxiliary sensor 104 is synchronized with the driving wave Q of the main sensor 103 so that the main sensor 103 and the auxiliary sensor 104 emit detection electric fields in synchronization and output corresponding capacitance signals, respectively. The sensing processor 11 is electrically connected with the auxiliary sensor 104 and the main sensor 103, and the sensing processor 11 is configured to drive the auxiliary sensor 104 and the main sensor 103 to operate, so as to generate a real-time sampling value according to the integrated signal fed back by the main sensor 103 and the auxiliary sensor 104, and select whether to output a trigger signal according to the real-time sampling value.
In this embodiment, after the inductor 10 is powered on, the induction processor 11 loads the synchronous driving wave Q to the main sensor 103 and the auxiliary sensor 104, so that the main sensor and the auxiliary sensor emit synchronous detection electric fields, and the two signals respectively return corresponding capacitance signals to the induction processor 11. Thus, when the user's finger approaches the sensing region 101 of the sensor 10, the capacitance increment returned by the main sensor 103 exceeds the threshold value, the generated real-time sample value crosses the trigger threshold value, and the sensing processor 11 outputs a trigger signal. When water drops drop on the areas opposite to the main sensor 103 and the auxiliary sensor 104, capacitance increments of the main sensor 103 and the auxiliary sensor 104 return, then the sensing processor 11 neutralizes the influence of the water drops on the capacitance increments of the main sensor 103 according to the feedback of the auxiliary sensor 104, that is, even if the capacitance increments of the main sensor 103 exceed the threshold, the generated real-time sampling value cannot exceed the trigger threshold, and the sensing processor 11 cannot send out a trigger signal. Therefore, the induction system can effectively avoid false triggering in rainy environment.
Alternatively, as shown in fig. 1, the auxiliary sensor 104 surrounds the main sensor 103, that is, the main sensor 103 is located at a central region of the substrate 100, the auxiliary sensor 104 is located at an edge region, and a diameter of a space d between the auxiliary sensor 104 and the main sensor 103 is greater than or equal to 1mm. In addition, in order to effectively match with the finger touch, it is only necessary to make the diameter of the main sensor 103 about 6mm, and the area of the auxiliary sensor 104 is not limited.
Specifically, the auxiliary sensors 104 in this embodiment are preferably a metal mesh that is laid within the vacant area 102. More specifically, the density of the metal ribs of the metal grid is 25% to 45%. The metal grid in this embodiment is made of copper wire.
In order to shield the main sensor 103 and the auxiliary sensor 104 from noise caused by the internal environment of the object to which the sensing system is mounted or the main board of the sensing system, as shown in fig. 2, a metal shielding mesh 105 is provided on the back surface of the substrate 100.
As shown in fig. 3 and 4, the sensing processor 11 further includes a first signal port D1 and a second signal port D2 for outputting the synchronous driving wave Q, and a first detection capacitor C1 and a second detection capacitor C2, wherein the first detection capacitor C1 is used for generating a corresponding capacitance value according to the electric field variation of the main sensor 103, and the second detection capacitor C2 is used for generating a corresponding capacitance value according to the electric field variation of the auxiliary sensor 104. The two ends of the first detection capacitor C1 are electrically connected between the first signal port D1 and the second signal port D2, and the positive terminal of the first detection capacitor C1 is electrically connected with the first signal terminal. The second detection capacitor C2 is electrically connected between the second signal port D2 and ground. The sensing processor 11 generates a real-time sampling value according to the capacitance variation of the first detection capacitor C1 and the second detection capacitor C2. In this embodiment, the sensing processor 11 configures two I/O ports thereon as a first signal port D1 and a second signal port D2, and synchronously outputs two square wave driving signals for driving the main sensor 103 and the auxiliary sensor 104 to operate.
Optionally, the sensing processor 11 further configures a reference value for the real-time sampling value, and outputs a trigger signal when a difference between the real-time sampling value and the reference value exceeds a trigger threshold at any time in a continuous time period (i.e., a detection period). In this embodiment, by configuring the reference value, the real-time sampling value may be quantized correspondingly based on the current application scenario, and the dual signal is filtered through continuous detection of a detection period, specifically, if the difference between the real-time sampling value and the reference value at any time within the detection period (for example, 100 ms) exceeds the trigger threshold, the trigger signal is output, and if the difference between the real-time sampling value and the reference value at a certain time within the detection period does not exceed the trigger threshold, the current detection period is cleared, and when a next detection trigger condition (the difference between the real-time sampling value and the reference value exceeds the trigger threshold), the next detection period is restarted. In addition, in the embodiment, through setting the reference value and the detection period, the jitter of the trigger signal can be effectively avoided, and the use experience is improved.
Further, in order to automatically adapt the reference value to the current application environment condition, the sensing processor 11 further generates a noise band having a certain bandwidth based on the current reference value, and the noise band includes an upper limit value larger than the reference value and a lower limit value smaller than the reference value. When the characteristic sampling value at any time in a continuous time period (such as 2S) is outside the noise band, namely exceeds the upper limit value of the noise band or is lower than the lower limit value of the noise band, the reference value is adjusted so that the characteristic sampling value is within the noise band, and the characteristic sampling value is a real-time sampling value of which the difference value with the current reference value is within a preset range. In this embodiment, the characteristic sampling value is noise data reflecting an environmental noise signal, for example, when the difference between the real-time sampling value and the current reference value is greater than 400, the current touch signal is determined as the current touch signal, and then the current real-time sampling value does not belong to the noise data, that is, the characteristic sampling value, so that the current timing cycle is cleared.
In addition, since the bandwidth of the noise band is fixed, when the reference value is changed, both the upper limit value and the lower limit value of the noise band are changed, and the range of the noise signal defined by the noise band is changed, therefore, if any characteristic sampling value reflecting the noise signal collected in the current timing cycle is not in the range of the noise band, the noise band can be changed by adjusting the magnitude of the reference value, so that the noise of the current environment is in the range of the noise band. After the reference value is changed, the judgment standard of the trigger signal is whether the difference value between the real-time sampling value and the reference value exceeds the trigger threshold value, so that the judgment of the trigger signal automatically filters the current noise signal, and the induction system is adaptive to application environments with different noises.
In summary, the work flow of the sensing system in the above embodiment is as follows:
s1: after electrification, obtaining an initial reference value;
s2: acquiring a real-time sampling value;
s3: judging whether the difference value between the real-time sampling value and the reference value within a preset time period (2S) exceeds a noise band, if so, entering S4, otherwise, entering S5;
s4: adjusting the reference value to enable the difference value of the current real-time sampling value and the reference value to be within the noise band;
s5: judging whether the difference value between the real-time sampling value and the reference value within a preset time period (100 ms) exceeds a preset trigger threshold value, if so, entering S6, otherwise, returning to S2;
s6: and outputting a trigger signal.
Referring to fig. 5 to 7, in another preferred embodiment of the present invention, a door handle sensing device is further disclosed, which includes a handle housing 3, and a sensing system as disclosed in the above embodiments is disposed in the handle housing 3. Specifically, the sensor 10 and the sensing processor 11 in the sensing system are fixed on a base 12, and the base 12 is installed in the automobile door handle, so that the automobile door handle has a touch control door opening function.
Optionally, in order to avoid water accumulation in the handle casing 3 from affecting the normal operation of the sensing system, the handle casing 3 includes a bottom casing 30 and a surface cover 31, a mounting groove 32 for accommodating the sensing system, that is, the base body 12, is provided on the bottom casing 30, a supporting step 33 is provided on the bottom wall of the mounting groove 32, a gap for draining water is formed between the base body 12 and the bottom wall of the mounting groove 32 by the supporting step 33, and a channel 34 communicated with the gap and the external space is further provided on the mounting groove 32. In this embodiment, since there is a gap between the base 12 carrying the sensing system and the bottom wall of the mounting groove 32, when water enters the mounting groove 32 through the gap between the surface cover 31 and the bottom shell 30, the water flow will flow to the channel 34 through the gap between the base 12 and the mounting groove 32 and be discharged out of the handle shell 3 through the channel 34, thereby avoiding water accumulation in the handle shell 3. Specifically, in the present embodiment, a lead port 34 of a wire harness connected to the induction system or a maintenance port 34' of the detachable face cover 31 may be employed as the passage 34.
Furthermore, a hydrophobic elastic medium layer 35 is filled between the inductor 10 and the surface cover 31 on the substrate 12, so that the inductor 10 and the surface cover 31 are attached seamlessly. Specifically, the insulating dielectric layer 35 is preferably a silicon gel or a VHB gel.
In summary, according to the door handle sensing device disclosed in the above embodiment, since the sensor 10 in the sensing system includes the main sensor 103 and the auxiliary sensor 104, when the door handle is in a rainy environment, frequent unlocking can be avoided, and the door handle has a drainage function, so that water accumulation around the sensing system is avoided, and the use experience is effectively improved.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (14)
1. An intelligent false touch prevention sensor is characterized by comprising a substrate, wherein the front surface of the substrate is provided with a sensing area and a dead zone positioned outside the sensing area, the sensing area is provided with a main sensor for detecting a touch signal, the dead zone is provided with an auxiliary sensor, and a gap is formed between the main sensor and the auxiliary sensor; the auxiliary sensor is synchronous with the driving wave of the main sensor, so that the main sensor and the auxiliary sensor synchronously emit detection electric fields and respectively output corresponding capacitance signals.
2. The intelligent false touch prevention sensor of claim 1, wherein the auxiliary sensor surrounds the main sensor, and wherein a diameter of a space between the auxiliary sensor and the main sensor is greater than or equal to 1mm.
3. The intelligent false touch prevention sensor of claim 1, wherein the auxiliary sensor is a metal grid laid within the vacant area.
4. The intelligent false touch prevention sensor of claim 3, wherein the density of the metal ribs of the metal grid is 25-45%.
5. The intelligent false touch prevention sensor according to claim 1, wherein a metal shielding mesh is arranged on the back of the substrate.
6. The induction system is characterized by comprising an inductor and an induction processor, wherein the inductor comprises a substrate, the front surface of the substrate is provided with an induction area and a dead zone positioned outside the induction area, the induction area is provided with a main sensor used for detecting a touch signal, the dead zone is provided with an auxiliary sensor, and a gap is formed between the main sensor and the auxiliary sensor; the auxiliary sensor is synchronous with the driving wave of the main sensor, so that the main sensor and the auxiliary sensor synchronously emit detection electric fields and respectively output corresponding capacitance signals; the induction processor is electrically connected with the auxiliary sensor and the main sensor, and is used for driving the auxiliary sensor and the main sensor to work so as to generate a real-time sampling value according to a comprehensive signal fed back by the main sensor and the auxiliary sensor and select whether to output a trigger signal according to the real-time sampling value.
7. The inductive system of claim 6, wherein said auxiliary sensor surrounds said main sensor, and wherein said auxiliary sensor is spaced from said main sensor by a distance greater than or equal to 1mm.
8. The inductive system of claim 6, wherein the back side of the substrate is provided with a metallic shielding mesh.
9. The sensing system according to claim 6, wherein the sensing processor comprises a first signal port for outputting a synchronous driving signal, a second signal port, and a first detection capacitor and a second detection capacitor, the first detection capacitor is used for generating a corresponding capacitance value according to the electric field variation of the main sensor, the second detection capacitor is used for generating a corresponding capacitance value according to the electric field variation of the auxiliary sensor, two ends of the first detection capacitor are electrically connected between the first signal port and the second signal port, and a positive terminal of the first detection capacitor is electrically connected with the first signal terminal; the second detection capacitor is electrically connected between the second signal port and the ground; and the induction processor generates the real-time sampling value according to the capacitance variation of the first detection capacitor and the capacitance variation of the second detection capacitor.
10. The sensing system of claim 6, wherein the sensing processor further configures a reference value for the real-time sampled value and outputs a trigger signal when a difference between the real-time sampled value and the reference value exceeds a trigger threshold at any one time during a continuous time period.
11. The sensing system of claim 10, wherein the sensing processor further generates a noise band based on the current baseline value, the noise band including an upper limit value that is greater than the baseline value and a lower limit value that is less than the baseline value, and wherein the baseline value is adjusted such that the characteristic sample value is within the noise band when the characteristic sample value at any time during a continuous period of time is outside the noise band, the characteristic sample value being the real-time sample value within a preset range of differences from the current baseline value.
12. A door handle sensing device comprising a handle housing provided with a sensing system as claimed in any one of claims 6 to 11.
13. The door handle sensing device according to claim 12, wherein the handle housing comprises a bottom shell and a face cover, the bottom shell is provided with a mounting groove for accommodating the sensing system; the induction system is arranged on a base body, a supporting step is arranged on the bottom wall of the mounting groove, a gap is formed between the base body and the bottom wall of the mounting groove through the supporting step, and a channel communicated with the gap and an external space is further arranged on the mounting groove.
14. The door handle sensing device according to claim 13, wherein a hydrophobic elastic insulating medium layer is filled between the sensor and the surface cover so as to enable the sensor and the surface cover to be attached seamlessly.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211022116.6A CN115437017A (en) | 2022-08-24 | 2022-08-24 | Intelligent false touch prevention sensor, sensing system and door handle sensing device |
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| CN202211022116.6A CN115437017A (en) | 2022-08-24 | 2022-08-24 | Intelligent false touch prevention sensor, sensing system and door handle sensing device |
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