Capacitive handle sensor integrated with pressure detection

Abstract

The utility model discloses a capacitance handle sensor integrated with pressure detection, which comprises a capacitance sensor and a pressure sensor, the capacitance sensor comprises a capacitance processor, a single board computer and a capacitance induction pole assembly, the single board computer is connected with the capacitance processor, and the capacitance processor is respectively connected with the capacitance induction pole assembly and the pressure sensor. The capacitance induction pole assembly is used for detecting the capacitance change around the handle and forming a corresponding signal, the pressure sensor is used for detecting the pressure change of the handle and forming a corresponding signal, and the capacitance processor receives the signals of the capacitance induction pole assembly and the pressure sensor at the same time; on the basis that a pressure value measured by the pressure sensor is compared with a threshold value, when the pressure value is larger than the threshold value, an unlocking signal can be formed, double insurance is formed through the capacitive sensor and the pressure sensor, and when the capacitive sensor and the pressure sensor form sending signals at the same time and the pressure signal is larger than the threshold value, the unlocking signal is formed. And the possibility of false triggering can be greatly avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile sensors, in particular to a capacitive handle sensor with integrated pressure detection. Background Art

[0002] At present, automotive electronics is developing rapidly. With the continuous improvement of people's requirements for driving comfort, sensor switches are increasingly used in automotive electronics, replacing transmission button switches, which not only ensure the consistency of door handle appearance but also have stronger reliability.

[0003] Capacitive handle sensors detect changes in capacitance to identify hand touches, thereby controlling the opening and closing of car doors. However, due to the different shapes of various brands and models and the different materials of handles, the capacitive signals received by the sensors are also different, requiring designers to continuously optimize and adjust according to the final environment. In addition, the environment in which the sensors outside the vehicle are located is complex and harsh, and the capacitive signals are easily affected by environmental interference to varying degrees, and the safety performance requirements of automobiles for sensors are getting higher and higher. Therefore, it is difficult for capacitive handle sensors to fully identify the correct human hand signals. In special circumstances, there may be false triggering or non-triggering failures, which are difficult to perfectly solve by adjusting the capacitive algorithm alone.

[0004] Since capacitive sensors have very high requirements for the surrounding environment, the presence of grounded metal or wires around them may affect their sensitivity, such as the wiring harness in the handle, sheet metal on the door, and parts plated with metal paint. In addition to the environment of the vehicle itself, the sensor may be falsely triggered in different external environments, such as rainy days, car washing, products with communication models or when metal is close. These situations will also cause the sensor to receive a signal of a change in capacitance value, which is very similar to the signal of a human touch, resulting in an erroneous trigger judgment and affecting the normal use of the product function.

[0005] Therefore, the existing capacitive handle sensor has the technical problem of low reliability. It can be seen that how to improve the reliability of the capacitive handle sensor is a problem that needs to be solved in the art. Utility Model Content

[0006] In view of the technical problem that the existing capacitive handle sensors have low reliability, the purpose of the utility model is to provide a capacitive handle sensor with integrated pressure detection. Based on the design of the existing capacitive handle sensor, pressure sensor detection is integrated. When the product detects the capacitive signal, it detects the pressure change on the handle surface. If there is a pressure change and it reaches the set threshold, it can be recognized as a correct trigger signal, and then the car door is unlocked, which greatly improves the reliability of the capacitive handle sensor.

[0007] In order to achieve the above-mentioned purpose, the utility model provides a capacitive handle sensor with integrated pressure detection, including a capacitive sensor and a pressure sensor, the capacitive sensor including a capacitive processor, a single-board computer, and a capacitive sensing electrode assembly, the single-board computer is connected to the capacitive processor, the capacitive processor is respectively connected to the capacitive sensing electrode assembly and the pressure sensor, the capacitive sensing electrode assembly is used to detect the capacitance change around the handle housing and form a corresponding signal, the pressure sensor is used to detect the pressure change of the handle housing and form a corresponding signal, after the capacitive processor receives the signals of the capacitive sensing electrode assembly and the pressure sensor at the same time, the pressure value measured by the pressure sensor is compared with a threshold value, and when it is greater than the threshold value, an unlocking signal can be formed.

[0008] Furthermore, the capacitive sensing electrode assembly includes a first sensing electrode and a second sensing electrode, and the first sensing electrode and the second sensing electrode are respectively connected to a capacitive processor, and can generate a capacitive signal in real time according to the surrounding environment, and transmit the capacitive signal to the capacitive processor for processing.

[0009] Furthermore, the capacitive sensor and the pressure sensor are integrated on a circuit board, the capacitive sensor is integrated on one end surface of the circuit board, and the pressure sensor is integrated on the other end surface of the circuit board, and the circuit board is connected to the handle housing through a support column.

[0010] Furthermore, one end of the support column is connected to the handle housing, and the other end is connected to an end surface of the circuit board where the capacitive sensor is provided, and corresponds to the position of the pressure sensor on the other end surface of the circuit board.

[0011] Furthermore, the capacitive sensor is integrated on a circuit board, and the pressure sensor is arranged on the back side of the pressing position of the handle housing through a flexible circuit board, and the flexible circuit board is connected to the circuit board through a wiring harness.

[0012] The capacitive handle sensor with integrated pressure detection provided by the utility model integrates pressure sensor detection on the basis of the design of the existing capacitive handle sensor. While the product detects the capacitive signal, it detects the pressure change on the handle surface. If there is a pressure change and it reaches the set threshold, it can be identified as a correct trigger signal to unlock the door, which greatly improves the reliability of the capacitive handle sensor. In addition, two setting schemes are designed for comparison and selection according to actual usage needs, thereby improving the applicability of the sensor.

[0013] Compared with the prior art, the capacitive handle sensor with integrated pressure detection provided by the utility model has the following beneficial effects:

[0014] 1. The added pressure sensor detection signal is stable and reliable, which can effectively solve the problem that the pure capacitive sensor solution is interfered by the complex and harsh external environment, reduce the product false touch rate, improve product sensitivity, and optimize the comfort of use;

[0015] 2. High detection accuracy, the deformation can be less than 0.1mm, and the judgment is more accurate;

[0016] 3. The current pressure sensor market is mature and cheap, with little impact on product prices. Small price changes bring about huge improvements in product performance, making it very easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and specific implementations.

[0018] Figure 1 A schematic diagram of the structure of a capacitive handle sensor with integrated pressure detection provided by the utility model;

[0019] Figure 2 This is a schematic diagram of the actual application of the capacitive handle sensor with integrated pressure detection in Example 1;

[0020] Figure 3 This is a schematic diagram of the actual application of the capacitive handle sensor with integrated pressure detection in Example 2.

[0021] Illustration Description:

[0022] Capacitive sensor 100, pressure sensor 200, circuit board 300;

[0023] Capacitor processor 110 , single board computer 120 , capacitor induction electrode assembly 130 , first induction electrode 131 , second induction electrode 132 , handle housing 210 , support column 220 , flexible circuit board 230 , wiring harness 240 . DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0025] Embodiment 1:

[0026] See also Figure 1 , which is a schematic diagram of the structure of a capacitive handle sensor with integrated pressure detection provided by the present invention.

[0027] As can be seen from the figure, the capacitive handle sensor with integrated pressure detection provided by the present invention includes two components: a capacitive sensor 100 and a pressure sensor 200 .

[0028] The capacitive handle sensor with integrated pressure detection provided by the utility model is applied to a car door switch. The solution is used to form an unlocking signal and send it to the car door switch to unlock the car door.

[0029] The capacitive sensor 100 includes a capacitive processor 110 , a single board computer 120 , and a capacitive sensing electrode assembly 130 .

[0030] The single board computer 120 is connected to the power supply and external communication connection, and is connected to the capacitive processor 110 to provide power for the entire sensor and realize data transmission and processing.

[0031] The capacitance processor 110 is connected to the capacitance sensing electrode assembly 130 and the pressure sensor 200 respectively, and is used to process signals from the capacitance sensing electrode assembly 130 and the pressure sensor 200 .

[0032] The capacitive sensing electrode assembly 130 is used to detect the capacitance change around the handle housing 210 and generate a corresponding signal, and the pressure sensor 200 is used to detect the pressure change of the handle housing 210 and generate a corresponding signal;

[0033] Furthermore, after receiving signals from the capacitive sensing electrode assembly 130 and the pressure sensor 200 at the same time, the capacitive processor 110 compares the pressure value measured by the pressure sensor 200 with a threshold value, and can generate an unlocking signal when the pressure value is greater than the threshold value.

[0034] Specifically, the pressure sensor 200 in this example is generally in a dormant state. When the capacitor processor 110 receives the capacitance signal of the capacitor sensing electrode assembly 130, it can wake up the pressure sensor 200 through communication. After the pressure sensor 200 is awakened, the pressure sensor 200 detects the pressure of a person touching the handle housing 210 and sends it to the capacitor processor 110, thereby avoiding wasting power.

[0035] Specifically, the capacitive sensing electrode assembly 130 includes a first sensing electrode 131 and a second sensing electrode 132, which are respectively connected to the capacitive processor 110 for generating a capacitive signal in real time according to the surrounding environment and transmitting the capacitive signal to the capacitive processor 110 for processing.

[0036] The pressure sensor 200 is connected to the internal communication interface of the capacitance processor 110 .

[0037] In the sensor with such a structure, generally, the first sensing electrode 131 and the second sensing electrode 132 operate normally with low power consumption, and the pressure sensor 200 is in a dormant state.

[0038] During operation, the first sensing electrode 131 or the second sensing electrode 132 senses in real time whether a human hand touches the automobile door handle housing 210 ; if so, a corresponding signal is triggered and transmitted to the capacitor processor 110 .

[0039] After receiving the capacitance signal, the capacitance processor 110 processes the capacitance signal and wakes up the pressure sensor 200 through communication at the same time. The pressure sensor 200 detects whether there is a pressure change in the door handle housing 210 and generates a pressure signal, and transmits the pressure signal to the capacitance processor 110 for processing. The capacitance processor 110 compares the pressure signal data with the set threshold. When the pressure signal data is greater than the threshold, the capacitance sensor 110 can form an unlocking signal and send it out through communication or level output. Only then can the door lock be opened.

[0040] Under normal circumstances, a person touches the handle housing 210 with a hand and then pulls or presses the handle housing 210 with force, so logically the capacitance signal is judged first, and then the pressure signal exerted on the handle housing 210 is detected. Both sensors are integrated in the same system design and communicate with each other very quickly, thus avoiding judgment delays caused by the long signal transmission path with the entire vehicle.

[0041] like Figure 2 , which is a schematic diagram of the actual application of the capacitive handle sensor with integrated pressure detection provided by the utility model.

[0042] From a structural analysis, the pressure sensor 200 detects the deformation of the object being measured, and the detection accuracy can be less than 0.1mm. To ensure the accuracy of the detection, it can generally be achieved in two ways. This example is an integrated solution.

[0043] The capacitance sensor 100 and the pressure sensor 200 are integrated on the circuit board 300 . The capacitance sensor 100 is arranged on one end surface of the circuit board 300 , and the pressure sensor 200 is arranged on the other end surface of the circuit board 300 .

[0044] In order to further enhance the measurement accuracy of the pressure sensor 200 , a support column 220 is provided between the circuit board 300 and the handle housing 210 . The circuit board 300 is connected to the handle housing 210 via the support column 220 . The support column 220 is used for conducting force.

[0045] Further, one end of the support column 220 is connected to the handle housing 210, and the other end is connected to one end surface of the circuit board 300 where the capacitive sensor 100 is provided, and corresponds to the position of the pressure sensor 200 on the other end surface of the circuit board 300;

[0046] By adding a support structure extending to the back of the pressure sensor 200 , the force conduction loss is reduced, and the measurement accuracy can be greatly enhanced.

[0047] Embodiment 2:

[0048] This embodiment is based on the first embodiment, and the structural positions of the pressure sensor 200 and the capacitance sensor 100 are described. The rest of the structures are the same and will not be described in detail here.

[0049] like Figure 3 In order to further enhance the applicability of the sensor, this embodiment makes changes to the setting positions of the pressure sensor 200 and the capacitance sensor 100 based on the embodiment 1, such as Figure 3 , adopts a split design to meet the actual usage needs of different scenarios.

[0050] The capacitive sensor 100 is integrated on the circuit board 300, and the pressure sensor 200 is directly set on the back of the pressing position of the handle shell 210 through the flexible circuit board 230. The pressure sensor 200 can directly and effectively detect the bending deformation of the pressing point. The capacitive sensor 100 and the pressure sensor 200 are separated.

[0051] The flexible circuit board 230 is fixedly arranged on the back side of the pressing position of the handle housing 210. The flexible circuit board 230 is connected to the circuit board 300 through the wiring harness 240, and the judgment of the pressure signal of the pressure sensor 200 is added to the original capacitance processor 110 detection.

[0052] The pressure signal measured by the pressure sensor 200 can be transmitted to the circuit board 300 through the flexible circuit board 230 , and the circuit board 300 then transmits the pressure signal to the capacitance processor 110 in the capacitance sensor 100 integrated thereon.

[0053] The pressure sensor 200 arranged in this way can be installed at an adjustable position according to actual use requirements, has reached a suitable state, and has high applicability.

[0054] The split solution is more flexible, and the position of the pressure sensor 200 can be adjusted as needed to achieve a suitable state. The integrated solution occupies less space. The two solutions can be compared and selected according to actual conditions, and the design solution is more flexible.

[0055] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A capacitive handle sensor with integrated pressure detection, characterized in that: It includes a capacitive sensor and a pressure sensor, the capacitive sensor includes a capacitive processor, a single-board computer, and a capacitive sensing electrode assembly, the single-board computer is connected to the capacitive processor, the capacitive processor is respectively connected to the capacitive sensing electrode assembly and the pressure sensor, the capacitive sensing electrode assembly is used to detect the capacitance change around the handle housing and form a corresponding signal, the pressure sensor is used to detect the pressure change of the handle housing and form a corresponding signal, after the capacitive processor receives the signals of the capacitive sensing electrode assembly and the pressure sensor at the same time, it compares the pressure value measured by the pressure sensor with a threshold value, and when it is greater than the threshold value, it can form an unlocking signal.

2. The capacitive handle sensor with integrated pressure detection according to claim 1, characterized in that: The capacitive sensing electrode assembly includes a first sensing electrode and a second sensing electrode, and the first sensing electrode and the second sensing electrode are respectively connected to a capacitive processor, and can generate a capacitive signal in real time according to the surrounding environment, and transmit the capacitive signal to the capacitive processor for processing.

3. The capacitive handle sensor with integrated pressure detection according to claim 1, characterized in that: The capacitive sensor and the pressure sensor are integrated on a circuit board, the capacitive sensor is integrated on one end surface of the circuit board, and the pressure sensor is integrated on the other end surface of the circuit board. The circuit board is connected to the handle housing through a supporting column.

4. The capacitive handle sensor with integrated pressure detection according to claim 3, characterized in that: One end of the support column is connected to the handle housing, and the other end is connected to an end surface of the circuit board where a capacitive sensor is arranged, and corresponds to the position of the pressure sensor on the other end surface of the circuit board.

5. The capacitive handle sensor with integrated pressure detection according to claim 1, characterized in that: The capacitive sensor is integrated on the circuit board, and the pressure sensor is arranged on the back side of the pressing position of the handle housing through a flexible circuit board, and the flexible circuit board is connected to the circuit board through a wiring harness.

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