Anti-pinch seal strip, automobile
By using a capacitor-to-digital converter circuit and proximity and contact sensing technologies in the detection module, the problem of unstable performance of traditional automotive anti-pinch rubber strips under temperature changes is solved, achieving highly sensitive anti-pinch detection and reducing the risk of false triggering.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING TASHAN TECHNOLOGY CO LTD
- Filing Date
- 2025-07-11
- Publication Date
- 2026-06-26
AI Technical Summary
Existing automotive anti-pinch rubber strips have unstable performance under different temperature conditions, making it difficult to balance safety and false alarm rate. They are particularly difficult to adapt to the anti-pinch force for children, and traditional solutions rely on rubber deformation detection, which has a high risk of false triggering.
Employing a capacitance-to-digital conversion circuit and a detection module, proximity and contact sensing are achieved through a strip electrode unit. The approach and contact of a human body or object are identified by changes in self-capacitance and mutual capacitance. Signal processing is performed in conjunction with a switch array and a processing module to improve detection sensitivity and compatibility.
It enables the anti-pinch function to be triggered without contact or only when close, improving the sensitivity and compatibility of detection, reducing environmental interference, adapting to different temperature conditions, and reducing the risk of false triggering.
Smart Images
Figure CN224413417U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to anti-pinch technology for automobiles, and more particularly to an anti-pinch sealing strip and automobiles. Background Technology
[0002] With the advancement of technology, cars are becoming increasingly intelligent, and more and more passenger vehicles are equipped with automatic door systems. Currently, the most mature applications are mainly in the middle doors and tailgates.
[0003] Passengers can open or close the doors electrically using sensors or buttons. To ensure safety during door movement, anti-pinch strips are typically installed. Currently, the most mature anti-pinch strips primarily work by measuring the open-circuit resistance and on-circuit resistance of different conductive rubbers within the strip, using a threshold setting to determine if a pinch has occurred. Because the anti-pinch detection relies on the deformation of the strip, a person will experience pressure when pinching occurs, until the resistance exceeds the threshold. To avoid false triggering, manufacturers generally design the threshold to be quite high, making this pinching force difficult for children to withstand. Furthermore, rubber is affected by temperature; at high temperatures, the rubber softens, reducing the pinching force, while at low temperatures, the rubber hardens, increasing the pinching force.
[0004] Chinese patent document CN110130769A discloses an anti-pinch strip for automobiles, comprising an anti-pinch strip body, a sheath wire, a conductive connector, an anti-pinch strip front end, and an anti-pinch strip end. The outer layer is wrapped with insulating rubber, and the interior consists of upper and lower layers of conductive rubber, each with a conductive wire embedded, forming a dumbbell-shaped cavity in the middle. When not under pressure, the upper and lower conductive rubbers separate, resulting in infinite contact resistance, and the total resistance equals the fixed resistance, which the system considers normal. Under pressure, the contact resistance drops sharply, indicating whether an anti-pinch signal has been triggered. This scheme relies on contact deformation to achieve anti-pinch detection; similarly, the elasticity of the rubber is affected by temperature.
[0005] Chinese patent document CN108798338 A discloses a highly sensitive, easy-to-install, and low-cost anti-pinch device for automobiles, including an anti-pinch system, a connecting device, wires, a sealing ring, a wire plug, and an anti-pinch control system. The anti-pinch system consists of four sets of conductors (first to fourth conductors), each conductor embedding a wire (first to fourth wire). The first to fourth conductors are equidistantly arranged circumferentially on the inner wall of the spring-loaded device, with gaps between them. When an object is pinched by the car door, the spring-loaded device is compressed and deformed, causing adjacent conductors to contact. After the wires contact, the short-circuit resistance (resistance value drops sharply to ≤2,000Ω) is reduced, forming a closed loop. The state of the pinched object is determined by analyzing the resistance value change signal. However, the preset threshold of the anti-pinch device cannot adapt to different scenarios (e.g., a lower threshold is needed due to the sensitivity of children's fingers), making it difficult to balance safety and false alarm rate. Utility Model Content
[0006] To address the shortcomings of existing technologies, an anti-pinch sealing strip with proximity and contact sensing capabilities is provided.
[0007] The anti-pinch sealing strip of this utility model includes a capacitance-to-digital conversion circuit, a switch array, a processing module, and a detection module. The detection module is fixed inside the sealing strip, and the sealing strip serves as an insulating protective component for the detection module. The detection module includes at least two strip-shaped electrode units extending longitudinally along the sealing strip. Each strip-shaped electrode unit includes at least one electrode segment. The strip-shaped electrode units are connected by interconnected wires and filled with flexible insulating material between each other. At least one strip-shaped electrode unit serves as a self-capacitance proximity sensing electrode, or two strip-shaped electrode units form a mutual capacitance proximity sensing electrode pair, and two strip-shaped electrode units form a contact sensing electrode pair. The capacitance-to-digital conversion circuit couples each electrode segment through the switch array to obtain proximity sensing capacitance and contact sensing capacitance respectively. The processing module couples the capacitance-to-digital conversion circuit.
[0008] The anti-pinch sealing strip of this utility model also includes the following auxiliary technical solutions:
[0009] In this embodiment, at least one of the strip electrode units serves as a conductive sleeve that encloses another strip electrode unit, and the cross-section of the conductive sleeve forms a completely or partially closed annular structure; the conductive sleeve is at least reused as a shielding electrode.
[0010] The detection module includes a first strip electrode unit and a second strip electrode unit, which are arranged parallel to each other with lines running at a certain interval. Alternatively, the detection module includes a first strip electrode unit and a second strip electrode unit, with the first strip electrode unit serving as an inner conductor and the second strip electrode unit being a conductive sleeve enclosing the first strip electrode unit, the cross-section of which forms a completely or partially closed annular structure. Alternatively, the detection module includes a first strip electrode unit, a second strip electrode unit, and a third strip electrode unit, with the first and second strip electrode units arranged parallel to each other with lines running at a certain interval as inner conductors, and the third strip electrode unit being a conductive sleeve that encloses both the first and second strip electrode units, the cross-section of which forms a partially closed annular structure. Alternatively, the detection module includes a first strip electrode unit, a second strip electrode unit, a third strip electrode unit, and a fourth strip electrode unit. The second and fourth strip electrode units are conductive sleeves with parallel wiring. The first strip electrode unit serves as the inner conductor of the second strip electrode unit, and the third strip electrode unit serves as the inner conductor of the fourth strip electrode unit. The cross-section of the conductive sleeve forms a completely or partially closed annular structure.
[0011] This includes a circuit board, a capacitor-to-digital converter circuit, a switch array, and a processing module mounted on the circuit board. The circuit board is either encased in a sealing strip or mounted on a substrate for housing the sealing strip.
[0012] The strip electrode unit has at least three units, and each strip electrode unit is arranged at equal intervals along the circumferential direction.
[0013] The electrodes are flat or circular in the direction of compression and rebound of the sealing strip.
[0014] The electrode extends longitudinally along the sealing strip to form a curved electrode.
[0015] Each strip electrode unit includes at least two mutually insulated electrode segments arranged longitudinally along the sealing strip.
[0016] The electrodes of each strip electrode unit are aligned vertically or staggered.
[0017] Another vehicle is provided, which includes the aforementioned anti-pinch sealing strip.
[0018] Compared to traditional pressure-sensitive anti-pinch sealing strips that require contact and pressure application to prevent pinching, this invention's sealing strip can trigger anti-pinch protection even when a person or object is near it without contact; it can also trigger anti-pinch protection when the object touches the sealing strip without applying pressure. This invention's sealing strip combines proximity and contact sensing functions, offering high detection sensitivity and good compatibility. Attached Figure Description
[0019] Figure 1a A schematic diagram of the anti-pinch sealing strip of this utility model is provided; Figure 1b A cross-sectional view of the sealing strip is provided;
[0020] Figure 1c A cross-sectional view of the sealing strip is provided.
[0021] Figure 2 A schematic diagram of multiple electrode segments is provided.
[0022] Figure 3a The electrode unit arrangement structure of the single core of the external notch sleeve is given; Figure 3b The electrode unit arrangement structure of the single core of the inner notch sleeve is given; Figure 3c The arrangement structure of the electrode unit of a fully enclosed single-core bushing is given; Figure 3d The electrode unit arrangement structure of the external notch sleeve dual core is given; Figure 3e The arrangement structure of the electrode unit with double notch sleeve and double core is given; Figure 3f The arrangement structure of the electrode unit with double-enclosed sleeve and double core is given.
[0023] Figure 4 A schematic diagram of a multi-strip electrode unit is given.
[0024] Figure 5a A schematic diagram of a flat electrode is provided; Figure 5b A schematic diagram of the curved electrode is given. Detailed Implementation
[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0026] In an exemplary embodiment, the anti-pinch sealing strip 1 can be installed on the vehicle door, or on the trunk and window frame, to adapt to the testing requirements of different vehicles. (Reference) Figures 1a to 1c The sealing strip 1 includes a circuit board 3 and a detection module. The circuit board 3 houses a capacitor-to-digital converter (CDC), a switch array, and a processing module. The circuit board 3 is integrated inside the sealing strip 1, or it can be mounted on a substrate (such as a car door) to accommodate the sealing strip 1, thus adapting to different vehicle installation requirements and achieving compatibility.
[0027] The detection module is fixed inside the sealing strip 1, which serves as an insulating protective component for the detection module, ensuring structural stability and waterproofing. The detection module includes at least two strip electrode units 2 extending longitudinally along the sealing strip 1, each strip electrode unit 2 comprising at least one electrode segment. The strip electrode units 2 are interconnected by wiring and filled with flexible insulating material, enabling them to withstand compressive deformation. At least one strip electrode unit 2 serves as a self-capacitance proximity sensing electrode, or two strip electrode units 2 form a mutual capacitance proximity sensing electrode pair, and two strip electrode units 2 form a contact sensing electrode pair. A capacitance-to-digital conversion circuit couples each electrode segment via a switch array to acquire proximity sensing capacitance and contact sensing capacitance respectively. A processing module couples the capacitance-to-digital conversion circuit.
[0028] Capacitance-to-digital converter (CDC) circuits, such as AD7142 and AD7147, use Δ-Σ modulation to directly convert the measured capacitance value into a digital value by repeatedly charging and discharging the measured capacitor and comparing it with a reference capacitance (see US Patent Number: 5,134,401), improving the measurement sensitivity of capacitance to the 1ff level. The CDC includes an excitation signal line port (AEC), a mutual capacitance input signal line port (ACC), a self-capacitance signal line port (SCA), and an active shielding signal line port (SHD). When the strip electrode unit 2 acts as a self-capacitance proximity sensing electrode, it is selected to SCA via a switch array; when two strip electrode units 2 form a mutual capacitance proximity sensing electrode pair, one is selected to AEC via a switch array, and the other is selected to ACC; when two strip electrode units 2 form a contact sensing electrode pair, one is selected to AEC via a switch array, and the other is selected to ACC, or one is selected to SCA via a switch array, and the other is selected to ground.
[0029] When a person or object is not in contact with the anti-pinch sealing strip 1 but is only approaching it, the approach distance causes a linear change in the self-capacitance of the self-capacitance sensing electrode or the mutual capacitance of the mutual capacitance sensing electrode pair, thereby identifying the proximity sensation. When a person or object just touches the sealing strip 1 without applying pressure to it, the self-capacitance of the self-capacitance sensing electrode or the mutual capacitance of the mutual capacitance sensing electrode pair forms a sudden change, which can identify the just-contact state. After that, the switch array switches to two linear electrode units 2 to form a contact sensing electrode pair. If the pressure continues, the distance between the contact sensing electrode pairs decreases, and the pressure change is sensed based on the parallel plate capacitance principle.
[0030] Based on the detection capabilities of proximity, just-in contact, and deep pressing, the anti-pinch response measures can be designed according to the recognition results. For example, as an exemplary response measure, when a human body or object approaches the sealing strip 1 from the detection area 4 from far to near, an anti-pinch level signal can be output, and the anti-pinch can be triggered according to the signal level; when a human body or object touches the sealing strip 1 from the detection area 4, the anti-pinch can be triggered immediately.
[0031] Compared to traditional pressure-sensitive anti-pinch sealing strips 1, which require contact and pressure to achieve anti-pinch protection, the sealing strip 1 of this invention can trigger anti-pinch protection even when a person or object is near it without contact; it can also trigger anti-pinch protection when in contact with the sealing strip 1 without applying pressure. The sealing strip 1 of this invention combines proximity sensing and contact sensing functions, offering high detection sensitivity and good compatibility.
[0032] Furthermore, mutual capacitance (insensitive to the environment) and self-capacitance (long detection distance) can be flexibly switched. By combining self-capacitance and mutual capacitance in the acquisition and judgment method, interference from the external environment can be reduced.
[0033] In this invention, the strip electrode unit 2 can be a single continuous strip electrode, without interruption, forming a complete conductive path, such as... Figure 1b As shown, the continuous structure reduces edge effects and signal crosstalk, making it suitable for applications with limited installation space or requiring a simple and reliable structure. The strip electrode unit 2 can also be formed by arranging multiple discrete electrodes longitudinally along the sealing strip 1, such as... Figure 2 As shown, each segment of the electrode is insulated from the others, and the electrodes of each strip electrode unit 2 are aligned vertically or staggered. Each segment of the electrode can be selected individually, which has the advantages of flexible configuration and good fault tolerance, and achieves better detection results.
[0034] Figure 1c The first exemplary arrangement of the detection module is given, wherein the detection module includes a first strip electrode unit 2 and a second strip electrode unit 2. The first strip electrode unit 2 and the second strip electrode unit 2 are arranged in parallel with a certain spacing and run side by side, which has the characteristics of simple structure and convenient arrangement.
[0035] As an improvement, refer to Figures 3a to 3f Furthermore, at least one of the strip electrode units 2 can be configured as a conductive sleeve enclosing another strip electrode unit 2. The cross-section of the conductive sleeve forms a completely or partially closed annular structure, and the conductive sleeve is reused at least as a shielding electrode. Through the shielding design, the coupling of environmental noise to the detection signal is suppressed, and the signal-to-noise ratio is improved.
[0036] like Figure 3a , Figure 3b , Figure 3c The detection module may include a first strip electrode unit 2 and a second strip electrode unit 2. The first strip electrode unit 2 serves as an inner conductor, and the second strip electrode unit 2 is a conductive sleeve that wraps around the first strip electrode unit 2. The cross-section of the conductive sleeve forms a completely or partially closed annular structure. Figure 3a In the first case, the conductive sleeve has its notch facing outwards, with the inner core encased inside, and flexible insulating material filling the space between them. In proximity sensing, the inner core can be configured as a self-capacitance electrode, and the sleeve connected to an SHD (Surface-to-Handle Shield) as an active shielding electrode; alternatively, the inner core and sleeve can form a mutual capacitance electrode pair. In contact sensing, the inner core can be configured as a self-capacitance electrode, and the sleeve grounded for shielding; alternatively, the inner core and sleeve can form a mutual capacitance electrode pair. Figure 3b In the middle, the notch of the conductive sleeve faces inward to avoid interference from the second direction, and the electrodes work in the same way. Figure 3c In the first case, the conductive sleeve is completely sealed. In proximity sensing, the sleeve acts as a self-capacitance electrode. In contact sensing, the inner core acts as a self-capacitance electrode, and the sleeve is grounded for shielding, minimizing external interference during contact sensing; alternatively, the inner core and the sleeve can be configured to form a mutual capacitance electrode pair.
[0037] like Figure 3d The detection module may include a first strip electrode unit 2, a second strip electrode unit 2, and a third strip electrode unit 2. The first and second strip electrode units 2 are arranged parallel to each other at a certain interval, serving as inner conductors. The third strip electrode unit 2 is a conductive sleeve that together wraps around the first and second strip electrode units 2. The cross-section of the conductive sleeve forms a partially closed annular structure. In proximity sensing, the inner core is used as a self-capacitance electrode, or two inner cores form a mutual capacitance electrode pair, and the sleeve serves as an active shielding electrode. In contact sensing, the inner core is used as a self-capacitance electrode, or two inner cores form a mutual capacitance electrode pair, and the sleeve is grounded for shielding.
[0038] like Figure 3e , Figure 3f The detection module may also include a first strip electrode unit 2, a second strip electrode unit 2, a third strip electrode unit 2, and a fourth strip electrode unit 2. The second strip electrode unit 2 and the fourth strip electrode unit 2 are conductive sleeves with parallel wiring. The first strip electrode unit 2 serves as the inner conductor of the second strip electrode unit 2, and the third strip electrode unit 2 serves as the inner conductor of the fourth strip electrode unit 2. The cross-section of the conductive sleeve forms a completely or partially closed annular structure. Figure 3e In the case of proximity sensing, the inner core can be used as a self-capacitance electrode, and the sleeve can be used as an active shielding electrode; alternatively, the inner core and the sleeve can form a mutual capacitance electrode pair; or, two sleeves can form a mutual capacitance electrode pair to achieve a wider detection range. In contact sensing, the inner core can be used as a self-capacitance electrode, and the sleeve can be grounded for shielding; alternatively, the inner core and the sleeve can form a mutual capacitance electrode pair; or, two sleeves can form a mutual capacitance electrode pair. Figure 3f In proximity sensing, the bushing acts as a self-capacitance electrode; or two bushings form a mutual capacitance electrode pair. In contact sensing, the inner core acts as a self-capacitance electrode, and the bushing is grounded for shielding; or two bushings form a mutual capacitance electrode pair.
[0039] In this invention, the number of electrodes is not limited to two; more electrodes can be added to achieve better results. Figure 4 A schematic diagram of the arrangement of more strip electrode units 2 is given, wherein there are at least three strip electrode units 2, and each strip electrode unit 2 is arranged at equal intervals along the circumferential direction, which has a wider angle detection capability, eliminates direction dependence, and improves reliability through redundancy design.
[0040] Furthermore, such as Figure 5a As shown, the electrode is formed in a flat or circular shape in the compression and rebound direction of the sealing strip 1. The circular shape offers versatility, while the flat shape prevents the electrode from embedding and weakening the compression and rebound elasticity of the sealing strip 1. For example... Figure 5bAs shown, the electrode can be configured to bend and extend longitudinally along the sealing strip 1 to form a curved electrode, which enhances the flexibility of the electrode and meets the bending / stretching requirements of the sealing strip 1.
[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.
Claims
1. An anti-pinch sealing strip, characterized in that: It includes a capacitor-to-digital converter circuit, a switch array, a processing module, and a detection module; The detection module is fixed inside the sealing strip, which serves as an insulating protective component for the detection module. The detection module includes at least two strip electrode units extending longitudinally along the sealing strip. Each strip electrode unit includes at least one electrode segment. The strip electrode units are connected by wires and filled with flexible insulating material. At least one strip electrode unit serves as a self-capacitance proximity sensing electrode, or two strip electrode units form a mutual capacitance proximity sensing electrode pair, and two strip electrode units form a contact sensing electrode pair. The capacitance-to-digital conversion circuit is coupled to each segment of electrodes through a switch array to obtain proximity sensing capacitance and contact sensing capacitance respectively. The processing module is coupled with a capacitor-to-digital converter circuit.
2. The anti-pinch sealing strip according to claim 1, characterized in that: At least one of the strip electrode units serves as a conductive sleeve enclosing another strip electrode unit, and the cross-section of the conductive sleeve forms a completely or partially closed annular structure. The conductive sleeve can be reused at least as a shielding electrode.
3. The anti-pinch sealing strip according to claim 1, characterized in that: The detection module includes a first strip electrode unit and a second strip electrode unit, which are arranged in parallel with lines running at a certain interval.
4. The anti-pinch sealing strip according to claim 1, characterized in that: The detection module includes a first strip electrode unit and a second strip electrode unit. The first strip electrode unit serves as an inner conductor, and the second strip electrode unit is a conductive sleeve that wraps around the first strip electrode unit. The cross-section of the conductive sleeve forms a completely or partially closed annular structure.
5. The anti-pinch sealing strip according to claim 1, characterized in that: The detection module includes a first strip electrode unit, a second strip electrode unit, and a third strip electrode unit. The first and second strip electrode units are arranged in parallel at a certain interval and run side by side as inner conductors. The third strip electrode unit is a conductive sleeve that together wraps around the first and second strip electrode units. The cross-section of the conductive sleeve forms a partially closed annular structure.
6. The anti-pinch sealing strip according to claim 1, characterized in that: The detection module includes a first strip electrode unit, a second strip electrode unit, a third strip electrode unit, and a fourth strip electrode unit. The second and fourth strip electrode units are conductive sleeves with parallel wiring. The first strip electrode unit serves as the inner conductor of the second strip electrode unit, and the third strip electrode unit serves as the inner conductor of the fourth strip electrode unit. The cross-section of the conductive sleeve forms a completely or partially closed annular structure.
7. The anti-pinch sealing strip according to claim 1, characterized in that: The circuit board includes a capacitor-to-digital converter circuit, a switch array, and a processing module, which are mounted on the circuit board. The circuit board is either encased in a sealing strip or mounted on a base for housing the sealing strip.
8. The anti-pinch sealing strip according to claim 1, characterized in that: The strip electrode unit has at least three units, and each strip electrode unit is arranged at equal intervals along the circumferential direction.
9. The anti-pinch sealing strip according to any one of claims 1-8, characterized in that: The electrode is flat or circular in the direction of compression and rebound of the sealing strip.
10. The anti-pinch sealing strip according to any one of claims 1-8, characterized in that: The electrode extends longitudinally along the sealing strip to form a curved electrode.
11. The anti-pinch sealing strip according to any one of claims 1-8, characterized in that: Each strip electrode unit includes at least two mutually insulated electrode segments arranged longitudinally along the sealing strip.
12. The anti-pinch sealing strip according to claim 11, characterized in that: The electrodes of each strip electrode unit are aligned vertically or staggered.
13. A car, characterized in that, Includes the anti-pinch sealing strip as described in any one of claims 1-8.