Touch sensing system capable of preventing water impact and mistaken touch

Abstract

The invention discloses a touch sensing system capable of preventing water impact and mistaken touch, and relates to the technical field of touch sensing. The system comprises a touch sensor and a control unit, the touch sensor is used for being embedded in a touch surface and designed into a plurality of annular coils of an inner and outer ring structure, and the annular coils are used for being in touch fit with fingers of a human body and comprise ground shielding coils and at least two collecting coils which are arranged at intervals. The control unit is electrically connected with the at least two acquisition coils respectively and is used for sampling touch sensing values on the acquisition coils in real time and then calculating to obtain sampling difference values of each pair of acquisition coils in real time; and finally, when it is found that the sampling difference value meets the hand touch condition set according to historical sampling difference values obtained when the sensor is impacted by water and the hand touches the sensor, it is determined that the touch action is effective, so that triggering is effective only when the hand touches the sensor, and the mistaken touch phenomenon under water impact such as rainstorm or large water flow is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of touch sensing, and in particular relates to a touch sensing system that is waterproof from impact and false touches. Background Art

[0002] New energy vehicles refer to vehicles that use unconventional vehicle fuels as a power source (or use conventional vehicle fuels but adopt new vehicle power devices), integrate advanced technologies in vehicle power control and drive, and form vehicles with advanced technical principles, new technologies and new structures. New energy vehicles include pure electric vehicles, extended-range electric vehicles, hybrid vehicles, fuel cell electric vehicles and hydrogen engine vehicles.

[0003] Against the backdrop of the demand for intelligence in new energy vehicles, touch sensing systems such as touch door handles and / or touch tailgate switches have gradually become indispensable configurations. However, how to prevent the touch sensing system from being accidentally touched due to water impact such as heavy rain or large water flow (for example, existing touch door handles / touch tailgate switches are prone to accidental unlocking when impacted by a water gun in a car wash scene, especially the first impact; existing touch door handles / touch tailgate switches may also be accidentally unlocked when impacted by heavy rain) has become a difficult problem in the industry. Summary of the invention

[0004] The present invention aims to provide a touch sensing system that is waterproof and shockproof, so as to solve the problem that the existing touch sensing system is prone to cause false touches under water shocks such as heavy rain or large water flow.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, a touch sensing system for waterproof impact and false touch is provided, comprising a touch sensor and a control unit, wherein the touch sensor is used for embedding on a touch surface and is designed as a plurality of annular coils in an inner and outer ring structure, the plurality of annular coils are used for cooperating with human finger touch and include a ground shielding coil and at least two collection coils arranged at intervals;

[0007] The control unit is electrically connected to the at least two acquisition coils, respectively, and is used to perform the following steps:

[0008] For each of the at least two acquisition coils, respectively sample the touch sensing value on the corresponding coil in real time to obtain a corresponding sampling value;

[0009] For each pair of acquisition coils in the at least two acquisition coils, respectively calculate the difference between two corresponding sampling values ​​in real time to obtain a corresponding sampling difference;

[0010] If the sampling differences of the pairs of acquisition coils meet a preset hand touch condition, the touch action is determined to be valid, wherein the hand touch condition is set based on the historical sampling differences of the pairs of acquisition coils obtained when water impacts and when the hand touches the touch sensor.

[0011] Based on the above invention content, a new touch sensing scheme capable of preventing accidental touch due to water impact is provided, that is, it includes a touch sensor and a control unit, wherein the touch sensor is used for being embedded on a touch surface and being designed as a plurality of annular coils in an inner and outer ring structure, the plurality of annular coils are used for cooperating with the touch of human fingers and include a ground shielding coil and at least two collection coils arranged at intervals, the control unit is electrically connected to the at least two collection coils respectively, and is used for first sampling the touch sensing values ​​on each collection coil in real time, and then calculating the sampling difference of each pair of collection coils in real time, and finally determining that the touch action is valid when it is found that the sampling difference satisfies the hand touch condition set according to the historical sampling difference obtained when the water impacts and the hand touches the sensor respectively, so that the touch action can be triggered only when the hand touches the sensor, avoiding the accidental touch phenomenon under water impact such as heavy rain or large water flow, and is particularly suitable for products such as touch door handles / touch tailgate switches, which is convenient for practical application and promotion.

[0012] In a possible design, the innermost annular coil is a solid coil, and the other annular coils are non-closed circular hollow coils or square hollow coils.

[0013] In a possible design, among the multiple annular coils, the annular coil located at the outermost layer is the ground shielding coil.

[0014] In a possible design, the control unit uses an MCU chip of model HC8AT3541 and its peripheral circuits, wherein the pins of the MCU chip are electrically connected to the acquisition coil via a current-limiting resistor.

[0015] In a possible design, one end of the current limiting resistor is electrically connected to the pin of the MCU chip, the other end of the current limiting resistor is electrically connected to one end of a bidirectional transient voltage suppression diode and the acquisition coil, respectively, and the other end of the bidirectional transient voltage suppression diode is grounded.

[0016] In a possible design, the control unit is further used to determine in real time, for each of the at least two acquisition coils, whether a difference between a corresponding sampling value and a corresponding sampling reference value exceeds a corresponding sampling threshold;

[0017] If the sampling differences of the pairs of acquisition coils meet the preset hand touch condition, determining that the touch action is valid includes:

[0018] If the difference between the sampling value of a certain collection coil, part of the collection coils or all the collection coils among the at least two collection coils and the sampling reference value exceeds the sampling threshold, the continuous change time of the sampling value of the certain collection coil, part of the collection coils or all the collection coils exceeds the preset first time threshold, and the sampling difference of each pair of collection coils meets the preset hand touch condition, it is determined that the touch action is valid, wherein the hand touch condition is set according to the historical sampling difference of each pair of collection coils obtained when water impacts and when the hand touches the touch sensor respectively.

[0019] In a possible design, the control unit is further used to, for each of the at least two acquisition coils, if it is found that the duration of continuous change of the corresponding sampling value exceeds a preset second duration threshold, cause the corresponding sampling reference value to rise or fall synchronously with the corresponding sampling value.

[0020] In a possible design, the second time threshold is 10 to 20 times the sampling period of the touch sensing value.

[0021] In a possible design, the control unit is further configured to, for each acquisition coil in the at least two acquisition coils, if it is found that the change rate of the corresponding sampling value exceeds a set value, cause the corresponding sampling threshold to rise or fall synchronously with the corresponding sampling value.

[0022] In a possible design, if the sampling difference between the pairs of acquisition coils meets a preset hand touch condition, determining that the touch action is valid includes:

[0023] For each pair of acquisition coils, determining whether the corresponding sampling difference exceeds a threshold value set according to the historical sampling difference values ​​corresponding to the water impact and the hand touching the touch sensor;

[0024] If the sampling differences of the pairs of acquisition coils exceed the set threshold, it is determined that the touch action is valid.

[0025] Beneficial effects of the above scheme:

[0026] The present invention provides a novel touch sensing solution that can resist accidental touch due to water impact, that is, it includes a touch sensor and a control unit, wherein the touch sensor is used for being embedded on a touch surface and being designed as a plurality of annular coils in an inner and outer ring structure, the plurality of annular coils are used for cooperating with the touch of human fingers and include a ground shielding coil and at least two collection coils arranged at intervals, the control unit is electrically connected to the at least two collection coils respectively, and is used for first sampling the touch sensing values ​​on each collection coil in real time, and then calculating the sampling difference of each pair of collection coils in real time, and finally determining that the touch action is valid when it is found that the sampling difference meets the hand touch condition set according to the historical sampling difference obtained when the water impacts and the hand touches the sensor respectively, so that the touch action can be triggered only when the hand touches the sensor, avoiding the accidental touch phenomenon under water impact such as heavy rain or large water flow, and is particularly suitable for products such as touch door handles / touch tailgate switches, which is convenient for practical application and promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the circuit structure of a touch sensing system that is waterproof and resistant to accidental touches provided in an embodiment of the present application.

[0029] Figure 2 This is a timing diagram of a sampling reference value, a sampling value, and a sampling difference value obtained when water impacts a touch sensor provided in an embodiment of the present application, wherein: Figure 2 (a) in FIG. 1 shows an example timing diagram of a sampling reference value obtained when water impacts the touch sensor. Figure 2 (b) in FIG. 1 shows an example timing diagram of the sampling values ​​of the inner and outer acquisition coils obtained when water impacts the touch sensor. Figure 2 (c) in the figure shows an example timing diagram of the sampling difference between the inner and outer acquisition coils obtained when water impacts the touch sensor.

[0030] Figure 3 This is a timing diagram of a sampling reference value, a sampling value, and a sampling difference value obtained when a hand touches a sensor provided in an embodiment of the present application, wherein: Figure 3 (a) in FIG. 1 shows an example timing diagram of the sampling reference value obtained when the hand touches the sensor. Figure 3 (b) in FIG. 1 shows an example timing diagram of the sampling values ​​of the inner and outer acquisition coils when the hand touches the sensor. Figure 3(c) in the figure shows an example timing diagram of the sampling difference between the inner and outer acquisition coils when the hand touches the sensor.

[0031] Figure 4 A schematic diagram of a second planar structure of a touch sensor in a touch sensing system provided in an embodiment of the present application.

[0032] Figure 5 A third planar structural schematic diagram of a touch sensor in a touch sensing system provided in an embodiment of the present application.

[0033] Figure 6 A fourth planar structural schematic diagram of a touch sensor in a touch sensing system provided in an embodiment of the present application.

[0034] In the above drawings: 100 - ground shielding coil; 200 - outer layer collection coil; 250 - middle layer collection coil; 300 - inner layer collection coil. DETAILED DESCRIPTION

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structures of the drawings is only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these embodiments without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0036] It should be understood that although the terms first and second, etc. may be used herein to describe various objects, these objects should not be limited by these terms. These terms are only used to distinguish one object from another object. For example, a first object can be referred to as a second object, and similarly, a second object can be referred to as a first object without departing from the scope of the exemplary embodiments of the present invention.

[0037] It should be understood that the term "and / or" that may appear in this document is merely a description of the association relationship between associated objects, indicating that there may be three relationships. For example, A and / or B can indicate three situations: A exists alone, B exists alone, or A and B exist at the same time. For another example, A, B and / or C can indicate the existence of any one of A, B and C or any combination of them. The term " / and" that may appear in this document describes another type of association object relationship, indicating that there may be two relationships. For example, A / and B can indicate two situations: A exists alone or A and B exist at the same time. In addition, the character " / " that may appear in this document generally indicates that the previous and next associated objects are in an "or" relationship.

[0038] Embodiment 1

[0039] like Figure 1 As shown, the touch sensing system provided in this embodiment and resistant to water impact and accidental touches includes but is not limited to a touch sensor and a control unit, wherein the touch sensor is used to be embedded in the touch surface and is designed as three annular coils with inner and outer ring structures, and the three annular coils are used to cooperate with the touch of human fingers and include a ground shielding coil and two collection coils arranged at intervals.

[0040] like Figure 1 As shown, in the specific structure of the touch sensing system, the touch surface is specifically but not limited to the surface of the vehicle body where the door handle or tailgate switch is located. The touch sensor is designed as a ground shielding coil 100, an outer collection coil 200 and an inner collection coil 300 arranged in sequence from the outside to the inside, and because the three annular coils are in coordination with the touch of human fingers, when the ground shielding coil 100 is grounded, when the human finger touches the three annular coils, the ground shielding coil 100 and the outer collection coil 200 can be connected and the ground shielding coil 100 and the inner collection coil 300 can be connected by the principle of human body conduction (of course, such conduction may also occur under water impact such as heavy rain or large water flow), and then the touch sensing values ​​(specifically but not limited to current value, voltage value or resistance value, etc.) on the outer collection coil 200 and the inner collection coil 300 can be conventionally collected respectively. As shown Figure 1 As shown, specifically, among the three annular coils, the innermost annular coil (that is, the inner collection coil 300) is a solid coil, and the other annular coils are non-enclosed circular hollow coils or square hollow coils. For example, the outer collection coil 200 and the ground shielding coil 100 are non-enclosed circular hollow coils (of course, they can also be square hollow coils separately). In addition, more specifically, among the multiple annular coils, the outermost annular coil is the ground shielding coil (of course, the ground shielding coil can also be located in the middle layer or the innermost layer).

[0041] The control unit is electrically connected to the two acquisition coils respectively, and is used for but not limited to executing the following steps S1 to S3.

[0042] S1. For each of the two acquisition coils, sample the touch sensing value on the corresponding coil in real time to obtain a corresponding sampling value.

[0043] In step S1, the specific sampling process can be conventionally derived based on existing current / voltage / resistance measurement technology and analog-to-digital conversion technology. In addition, the sampling period of the touch sensing value is, for example but not limited to, 2 milliseconds.

[0044] S2. For each pair of acquisition coils in the two acquisition coils, respectively calculate the difference between two corresponding sampling values ​​in real time to obtain the corresponding sampling difference.

[0045] In step S2, since there is only one pair of acquisition coils in the two acquisition coils: the outer acquisition coil 200 and the inner acquisition coil 300, the sampling difference between the outer acquisition coil 200 and the inner acquisition coil 300 can be calculated.

[0046] S3. If the sampling difference of each pair of acquisition coils meets a preset hand touch condition, it is determined that the touch action is valid, wherein the hand touch condition is set according to the historical sampling difference of each pair of acquisition coils obtained when water impacts and when the hand touches the touch sensor.

[0047] In step S3, the hand touch condition is specifically but not limited to a threshold-based comparison form, that is, if the sampling difference between each pair of acquisition coils meets the preset hand touch condition, it is determined that the touch action is valid, including but not limited to the following steps S31 to S32.

[0048] S31. For each pair of acquisition coils, determine whether the corresponding sampling difference exceeds a threshold value set according to the corresponding historical sampling difference values ​​respectively obtained when water impacts and when a hand touches the touch sensor.

[0049] In the step S31, the historical sampling difference values ​​of the pairs of acquisition coils (since there is only one pair of acquisition coils among the two acquisition coils: the outer acquisition coil 200 and the inner acquisition coil 300, only this pair of acquisition coils is illustrated) are obtained when water impacts the touch sensor, for example Figure 2 As shown in (c); when the hand touches the touch sensor, the historical sampling difference of each pair of acquisition coils (because there is only one pair of acquisition coils among the two acquisition coils: the outer acquisition coil 200 and the inner acquisition coil 300, only this pair of acquisition coils is illustrated), for example Figure 3 As shown in (c), it can be seen that there is an obvious difference in the sampling difference data obtained in the two situations, and then the set threshold suitable for classifying the touch situation based on the sampling difference (that is, whether it is divided into a hand touch situation or a water impact situation) can be conventionally determined by comparing the two sampling difference data.

[0050] S32. If the sampling differences of each pair of acquisition coils exceed the set threshold, it is determined that the touch action is valid.

[0051] In the step S32, since the touch sensing value is generally a current value, and according to actual conditions, it is found that the historical sampling difference values ​​of the pairs of acquisition coils obtained when the hand touches the touch sensor are significantly greater than the historical sampling difference values ​​of the pairs of acquisition coils obtained when water impacts the touch sensor, the touch action is determined to be valid when the sampling differences of the pairs of acquisition coils exceed a set threshold, otherwise the touch action is determined to be invalid, thereby avoiding false touches caused by water impacting the touch sensor.

[0052] Based on the detailed description of the above touch sensing system, it can be known that the present embodiment provides a new touch sensing solution capable of preventing accidental touches due to water impact, that is, it includes a touch sensor and a control unit, wherein the touch sensor is used for three annular coils embedded on a touch surface and designed to be an inner and outer ring structure, the three annular coils are used to cooperate with the touch of human fingers and include a ground shielding coil and two collection coils arranged at intervals, the control unit is electrically connected to the two collection coils respectively, and is used to first sample the touch sensing values ​​on each collection coil in real time, and then calculate the sampling difference of each pair of collection coils in real time, and finally determine that the touch action is valid when it is found that the sampling difference meets the hand touch condition set according to the historical sampling difference obtained when the water impacts and the hand touches the sensor, so that the touch action can be triggered only when the hand touches the sensor, avoiding the accidental touch phenomenon under water impact such as heavy rain or large water flow, and is particularly suitable for products such as touch door handles / touch tailgate switches, which is convenient for practical application and promotion.

[0053] Specifically, the control unit is exemplified but not limited to an MCU (Microcontroller Unit) chip of model HC8AT3541 and its peripheral circuits, wherein the pins of the MCU chip are electrically connected to the acquisition coil via a current limiting resistor. Figure 1 As shown, in detail, pin 15 of the MCU chip is electrically connected to one end of the first current limiting resistor R6, and the other end of the first current limiting resistor R6 is electrically connected to the outer layer acquisition coil 200; pin 13 of the MCU chip is electrically connected to one end of the second current limiting resistor R7, and the other end of the second current limiting resistor R7 is electrically connected to the inner layer acquisition coil 300. In addition, in order to be able to sample the current value (i.e., the touch sensing value) under the same voltage condition at different times to improve the accuracy of the subsequent touch action determination result, preferably, one end of the current limiting resistor is electrically connected to the pin of the MCU chip, and the other end of the current limiting resistor is electrically connected to one end of the bidirectional transient voltage suppression diode and the acquisition coil, respectively, and the other end of the bidirectional transient voltage suppression diode is grounded; as shown Figure 1 As shown, each of the acquisition coils is electrically connected to two of the bidirectional transient voltage suppression diodes.

[0054] Preferably, the control unit is also used to determine in real time whether the difference between the corresponding sampling value and the corresponding sampling reference value of each acquisition coil in the two acquisition coils exceeds the corresponding sampling threshold; if the sampling difference of each pair of acquisition coils meets the preset hand touch condition, the touch action is determined to be valid, specifically including: if the difference between the sampling value of a certain acquisition coil, part of the acquisition coils or all the acquisition coils in the two acquisition coils and the sampling reference value exceeds the sampling threshold, the continuous change duration of the sampling value of the certain acquisition coil, the part of the acquisition coils or all the acquisition coils exceeds the preset first duration threshold and the sampling difference of each pair of acquisition coils meets the preset hand touch condition, then the touch action is determined to be valid, wherein the hand touch condition is set according to the historical sampling difference of each pair of acquisition coils obtained when water impacts and when the hand touches the touch sensor. For example, Figure 1 As shown, the certain acquisition coil or the part of the acquisition coils can be specifically the inner acquisition coil 300. Further preferably, the control unit is also used for, for each of the two acquisition coils, if it is found that the duration of continuous change of the corresponding sampling value exceeds the preset second duration threshold, then the corresponding sampling reference value is synchronously increased or decreased with the corresponding sampling value; the second duration threshold is specifically 10 to 20 times (i.e., 20 to 40 milliseconds) of the sampling period of the touch sensing value; the control unit is also used for, for each of the two acquisition coils, if it is found that the change rate of the corresponding sampling value exceeds the set value, then the corresponding sampling threshold is synchronously increased or decreased with the corresponding sampling value. In addition, the first duration threshold can be equal to the second duration threshold, or it can be different; the step amplitude / rate of the synchronous increase or the synchronous decrease can also be specifically positively correlated with the size of the sampling value.

[0055] In summary, the touch sensing system provided by this embodiment has the following technical effects:

[0056] The present embodiment provides a novel touch sensing solution capable of preventing accidental touches due to water impact, namely, comprising a touch sensor and a control unit, wherein the touch sensor is used for three annular coils embedded on a touch surface and designed to be an inner and outer ring structure, the three annular coils are used to cooperate with the touch of human fingers and include a ground shielding coil and two collection coils arranged at intervals, the control unit is electrically connected to the two collection coils respectively, and is used to first sample the touch sensing values ​​on each collection coil in real time, and then calculate the sampling difference of each pair of collection coils in real time, and finally determine that the touch action is valid when it is found that the sampling difference meets the hand touch condition set according to the historical sampling difference obtained when the water impacts and the hand touches the sensor respectively, so that the touch action can be triggered only when the hand touches the sensor, avoiding the accidental touch phenomenon under water impact such as heavy rain or large water flow, and is particularly suitable for products such as touch door handles / touch tailgate switches, which is convenient for practical application and promotion.

[0057] Embodiment 2

[0058] Based on the technical solution of the first embodiment, this embodiment further provides a second touch sensing system, which is different from the touch sensing system of the first embodiment in that: the ground shielding coil in the touch sensor is a square hollow coil, such as Figure 4 shown.

[0059] The specific details and technical effects of this embodiment can be derived with reference to the aforementioned embodiment 1, and will not be described in detail here.

[0060] Embodiment 3

[0061] Based on the technical solution of the first embodiment, the present embodiment further provides a third touch sensing system, which is different from the touch sensing system of the first embodiment in that: the touch sensor is designed as four annular coils in an inner and outer ring structure, and the four annular coils include a ground shielding coil 100, an outer layer collection coil 200, a middle layer collection coil 250 and an inner layer collection coil 300 arranged in sequence from the outside to the inside (that is, there are three collection coils in total, so in the execution steps of the control unit, all "two collection coils" must be replaced by "three collection coils"), such as Figure 5 shown.

[0062] The specific details and technical effects of this embodiment can be derived with reference to the above-mentioned embodiment 1, and will not be described in detail here. In addition, the touch sensor can also be designed as more annular coils in an inner and outer ring structure (including a ground shielding coil and at least four collection coils).

[0063] Embodiment 4

[0064] Based on the technical solution of the third embodiment, this embodiment further provides a fourth touch sensing system, which is different from the touch sensing system described in the third embodiment in that: the ground shielding coil in the touch sensor is a square hollow coil, such as Figure 6 shown.

[0065] The specific details and technical effects of this embodiment can be derived with reference to the aforementioned third embodiment, and will not be described in detail here.

[0066] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A touch sensing system that is waterproof against accidental touches due to impact, characterized in that: It includes a touch sensor and a control unit, wherein the touch sensor is used to be embedded on the touch surface and is designed as a plurality of annular coils in an inner and outer ring structure, the plurality of annular coils are used to cooperate with the touch of human fingers and include a ground shielding coil and at least two collection coils arranged at intervals; The control unit is electrically connected to the at least two acquisition coils, respectively, and is used to perform the following steps: For each of the at least two acquisition coils, respectively sample the touch sensing value on the corresponding coil in real time to obtain a corresponding sampling value; For each pair of acquisition coils in the at least two acquisition coils, respectively calculate the difference between two corresponding sampling values ​​in real time to obtain a corresponding sampling difference; If the sampling differences of the pairs of acquisition coils meet a preset hand touch condition, the touch action is determined to be valid, wherein the hand touch condition is set based on the historical sampling differences of the pairs of acquisition coils obtained when water impacts and when the hand touches the touch sensor.

2. The touch sensing system according to claim 1, wherein: Among the multiple annular coils, the innermost annular coil is a solid coil, and the other annular coils are non-closed circular hollow coils or square hollow coils.

3. The touch sensing system according to claim 1, wherein: Among the multiple annular coils, the annular coil located at the outermost layer is the ground shielding coil.

4. The touch sensing system according to claim 1, wherein: The control unit adopts an MCU chip of model HC8AT3541 and its peripheral circuits, wherein the pins of the MCU chip are electrically connected to the acquisition coil via a current limiting resistor.

5. The touch sensing system according to claim 4, wherein: One end of the current limiting resistor is electrically connected to the pin of the MCU chip, the other end of the current limiting resistor is electrically connected to one end of a bidirectional transient voltage suppression diode and the acquisition coil respectively, and the other end of the bidirectional transient voltage suppression diode is grounded.

6. The touch sensing system according to claim 1, wherein: The control unit is also used to determine in real time whether the difference between the corresponding sampling value and the corresponding sampling reference value exceeds the corresponding sampling threshold for each of the at least two acquisition coils; If the sampling differences of the pairs of acquisition coils meet the preset hand touch condition, determining that the touch action is valid includes: If the difference between the sampling value of a certain collection coil, part of the collection coils or all the collection coils among the at least two collection coils and the sampling reference value exceeds the sampling threshold, the continuous change time of the sampling value of the certain collection coil, part of the collection coils or all the collection coils exceeds the preset first time threshold, and the sampling difference of each pair of collection coils meets the preset hand touch condition, it is determined that the touch action is valid, wherein the hand touch condition is set according to the historical sampling difference of each pair of collection coils obtained when water impacts and when the hand touches the touch sensor respectively.

7. The touch sensing system according to claim 6, wherein: The control unit is further configured to, for each of the at least two acquisition coils, if it is found that the duration of continuous change of the corresponding sampling value exceeds a preset second duration threshold, make the corresponding sampling reference value rise or fall synchronously with the corresponding sampling value.

8. The touch sensing system according to claim 7, wherein: The second time threshold is 10 to 20 times of a sampling period of the touch sensing value.

9. The touch sensing system according to claim 6, wherein: The control unit is further configured to, for each of the at least two acquisition coils, if it is found that the change rate of the corresponding sampling value exceeds a set value, cause the corresponding sampling threshold to rise or fall synchronously with the corresponding sampling value.

10. The touch sensing system according to claim 1, wherein: If the sampling differences of the pairs of acquisition coils meet the preset hand touch condition, determining that the touch action is valid includes: For each pair of acquisition coils, determining whether the corresponding sampling difference exceeds a threshold value set according to the historical sampling difference values ​​corresponding to the water impact and the hand touching the touch sensor; If the sampling differences of the pairs of acquisition coils exceed the set threshold, it is determined that the touch action is valid.

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