The invention relates to pinch sensors, particularly for vehicular closure panels where it is desirable to prevent a closure panel such as a lift gate or side door from closing if a foreign obstacle or object is detected just as the panel closes.
It is known to apply pinch sensors to prevent a closure panel such as a lift gate or side door from closing if a foreign obstacle or object is detected just as the panel closes. The pinch sensors come in different forms, including non-contact sensors such as those based on capacitance changes, and contact sensors which rely on a physical deformation caused by contact with a foreign object.
The contact pinch sensors are typically applied in the form of a rubber strip which is routed along and adjacent to the periphery of a vehicle door. The rubber strip embeds two wires which are separated by an air gap. When the two wires contact one another, the electrical resistance therebetween drops, and a controller connected to the two wires monitors the drop in resistance, detecting an object when the drop exceeds a predetermined threshold. The fundamental problem with such conventional pinch sensors, however, is that they have a limited activation angle typically on the order of about thirty five degrees. Thus, in the event the pinch force is applied obliquely rather than head on, the wires may not contact one another.
The invention seeks to provide a resistive contact pinch sensor have a considerably wider activation range or angle. It is also desired to provide such a sensor with a low manufacturing cost.
According to one aspect of the invention a multi-lobed pinch sensor is provided. The pinch sensor includes a resiliently deformable non-conductive tubular casing having an outer wall and an inner wall that defines an internal hollow region. At least three electrically-conductive conduits are disposed along the inner wall of the casing. In section, the three electrically-conductive conduits are substantially equidistantly spaced circumferentially along the inner wall of the casing, and each electrically-conductive conduit has a periphery that extends into the hollow region. When the casing is suitably deformed, at least one of the electrically-conductive conduits comes into contact with a electrically conductive reference element to thereby lower the resistance therebetween and enable a controller to signal the detection of an obstacle.
In the pinch sensor each electrically-conductive conduit preferably comprises an elastomeric electrically-conductive skirt that envelops a low resistance electrical conductor connectable to a controller input.
In one embodiment, the casing has a cross-sectional shape of a semi-circular arch, including a base portion and a semi-circular portion. One of the electrically-conductive conduits is disposed along the base portion and functions as the reference element. The other two electrically-conductive conduits are disposed along the semi-circular portion. The internal hollow region includes two rebates that straddle the electrically-conductive reference conduit, where each rebate presents a pivot point enabling the casing to flex such that the corresponding electrically-conductive conduit disposed along the semi-circular portion is directed towards the electrically-conductive reference conduit.
In another embodiment, the conductive reference element is provided by an additional electrically-conductive core disposed within the casing inward of the three electrically-conductive conduits. The electrically-conductive core is connected to the casing by one or more non-conductive webs branching from the casing inner wall. The electrically-conductive core preferably has a tri-petal cross-sectional shape so as to trisect the internal hollow region into three air gaps. Each of the electrically-conductive conduits projects partially into one of the three individual air gaps, respectively. Each electrically-conductive conduit is preferably formed from an elastomeric electrically conductive skirt that envelopes a low resistance electrical conductor connectable to one of the controller inputs. These conductive skirts preferably have substantially similar circular cross-sectional profiles and the air gaps have substantially similar sector-shaped cross-sectional profiles of substantially uniform depth, thereby providing a substantially uniform travel for activating the sensor across an activation angle of at least 270 degrees.
According to another aspect of the invention a coaxial pinch sensor is provided. The coaxial pinch sensor includes a resiliently deformable non-conductive tubular casing. An electrically-conductive tubular conduit is disposed within the tubular casing, the tubular conduit having an inner wall defining an internal hollow region. An electrically-conductive core is disposed within the electrically-conductive tubular conduit and is normally spaced apart therefrom. When the casing is suitably deformed, the electrically-conductive tubular conduit comes into contact with the electrically-conductive core to thereby lower the resistance therebetween and enable a controller to signal the detection of an obstacle.
The coaxial pinch sensor prefereably including at least one non-conductive spacing element disposed between the electrically-conductive core and the electrically-conductive tubular conduit.
And the electrically-conductive core is preferably substantively coaxial with the electrically-conductive tubular conduit.
According to one embodiment of the coaxial pinch sensor, multiple non-conductive spacing elements are disposed between the electrically-conductive core and the electrically-conductive tubular conduit, these spacing elements being resiliently compressible. In addition, the electrically-conductive core is preferably segmented by a nonconductive divider having an end portion contacting the electrically-conductive tubular conduit. And the electrically-conductive core is preferably formed from an elastomeric electrically conductive skirt that envelops a low resistance electrical conductor.
According to another embodiment of the coaxial pinch sensor the electrically-conductive tubular conduit has a cross-sectional shape of a three-quarter cylinder having a base portion and a semi-circular portion. The spacer is connected to the base portion of the electrically-conductive tubular conduit. The electrically-conductive core has a semi-circular cross-sectional shape, and the hollow region includes an air gap that has a substantially sector-shaped cross-sectional profile of substantially uniform depth, thereby providing a substantially uniform travel for activating the sensor across an activation angle of at least 270 degrees.
The foregoing and other aspects of the invention will be more readily appreciated having reference to the drawings, wherein:
The particular pinch sensor 100 shown in
More particularly, each planetary lobe 102 includes a conductive skirt 104 that is preferably formed from an elastomeric conductive material, e.g., conductive rubber as known in the art per se. The conductive skirt 104 surrounds a low resistance ‘outboard’ electrical conductor 106, discussed in greater detail below, that is connected to one of the controller inputs (all three electrical conductors being connectable to the same controller input). Each skirt 104 is preferably formed in a closed loop shape such as the illustrated circular shape so as to envelop the corresponding outboard electrical conductor 106, although it will be understood that a complete encirclement is not essential.
The central conductive core 112 includes a conductive tri-petal or trilateral body 113 that is preferably formed from the same material as the conductive skirt 104. The trilateral body 113 preferably surrounds a low resistance central electrical conductor 114 that is disposed along the longitudinal axis of the pinch sensor 100 and is connected to another input of the controller.
The three planetary lobes 102 are partially embedded in a resiliently deformable, non-conductive tubular casing 110, as may be provided by rubber, that forms the outer periphery of the sensor 100. The casing 110 encapsulates the conductive portions of the sensor, protecting it from ambient influences. The casing 110 also defines the stiffness of the section and its appearance. The casing 110 has a generally annular shaped peripheral cross-sectional profile (e.g., a three-quarter cylinder as illustrated) with three integrally formed, inwardly leading web portions 111. The central trilateral body 113 has three corners that are each integrally connected to one of three web portions 111 to thus trisect the casing 100 and define three distinct air gaps labeled individually as 108a, 108b, 108c.
In the illustrated embodiment about one half 104j of the outer periphery of each conductive skirt 104 abuts the casing 110, and about one half 104k of the outer periphery of each conductive skirt 104 projects into one of the air gaps 108a, 108b, 108c. Each air gap is preferably crescent or sector shaped in section with uniform depth and sized to permit about one hundred and eighty degrees of the outer periphery of the respective conductive skirt 104 to project into the air gap. The crescent or sector shape of the air gap 108, coupled with the circular shape of the planetary conductive skirt 104, also provides a relatively uniform depth d across the air gap 108 between the projecting portion 104k of the planetary conductive skirt 104 and the corresponding sidewall 113a, 113b, 113c of the central trilateral body 113. The distance d is selected to achieve a selected deformation of the casing 110 before one of the planetary lobes 102 contacts the central core 112, but in any event the preferred design ensures that the sensor 100 has a relatively constant activation travel over a wide range of pinch directions.
Each sidewall 112a, 112b, 112c of the central trilateral body 112 faces one of the projecting portions 104k of the planetary conductive skirt 104 and subtends it by an angle alpha of about one hundred twenty degrees. As the three planetary lobes 102 are angularly spaced apart from one another by about one hundred and twenty degrees, it will be seen that the pinch sensor 100 has a very wide activation angle. This can be appreciated more fully with additional reference to
As shown in
In preferred embodiments the electrical conductors 106 and 114 are formed from multiple strands of wire such as copper combined with plastic reinforcing fiber. Such conductors can provide high elasticity in both axial (stretching) and transverse (bending) directions.
The pinch sensor 200 achieves a relatively wide activation range or angle by incorporating three electrically-conductive conduits 202a, 202b, and 203 within a non-conductive tubular casing 210. In section, the electrically-conductive conduits 102, which are alternatively referred to as conductive lobes, are substantially equidistantly spaced circumferentially along the inner wall of the tubular casing 210 and/or about a central cylindrical axis 214. The upper lobes 202a, 202b are insulated from one another by a central, common, air gap 208, but upon application of a suitable pinch force to deform the tubular casing 210 one of the conductive upper lobes 202, which are connected to one input of a controller (not shown), will come into contact with the conductive lower or base lobe 203, which is connected to another input of the controller, lowering the resistance therebetween, and thus enabling the controller (not shown) to signal the presence of an obstacle.
More particularly, each conductive lobe 202, 203 includes a conductive skirt 204 that is preferably formed from an elastomeric conductive material, e.g., conductive rubber as known in the art per se. The conductive skirt 204 surrounds a low resistance electrical conductor 206, such as discussed above, that is connected to a controller input. Each skirt 204 is preferably formed in a closed loop shape such as the illustrated circular shape so as to envelop the corresponding electrical conductor 206, although it will be understood that a complete encirclement is not essential. The conductive skirts 204 of the upper lobes 202 also include teardrop shaped tail sections 212 that provides a wider face (in comparison with a strict circular profile) relative to the base lobe 203.
Each of the conductive lobes 202 is partially embedded in the resiliently deformable, non-conductive tubular casing 210, as may be provided by rubber, that forms the outer periphery of the sensor 200. The casing 210 encapsulates the conductive portions of the sensor, protecting it from ambient influences. The casing 210 also defines the stiffness of the section and its appearance. The particular casing 210 illustrated in
In the illustrated embodiment about one half of the outer periphery of each conductive skirt 204 abuts the tubular casing 210, and about one half of the outer periphery of each conductive skirt 204 projects into the air gap 208. The air gap 208 includes two lower recesses or rebates 208a, 208b that present pivot points to allow the casing 210 to flex such that the conductive upper lobes 202 are directed towards the conductive base lobe 203 that is situated adjacent the base of inverted U-shaped casing 210. The tri-lobed pinch sensor 200 also has a wide activation angle as will be appreciated more fully with additional reference to
As shown in
The coaxial pinch sensor 300 achieves a wide activation range or angle by incorporating a central electrically-conductive core 302 and a coaxial electrically-conductive tubular outer sheath 304 within a tubular casing 310. The conductive core 302 and conductive sheath 304 are normally spaced apart by a plurality of spacers/springs 306, but upon application of a suitable pinch force to deform the tubular casing 310 the conductive sheath 304, which is connected to one input of a controller (not shown), will come into contact with the conductive core 302, which is connected to another input of the controller, lowering the resistance therebetween and enabling the controller (not shown) to signal the presence of an obstacle.
More particularly, the coaxial sensor 300 includes a resiliently deformable, non-conductive tubular casing 310, as may be provided by rubber, that forms the outer periphery of the sensor 300. The particular casing 310 illustrated in
The casing 310 has an evacuated central region. The conductive outer sheath 304 is disposed immediately adjacent the inner wall of the casing 310 and is also preferably cylindrical to ensure a mating fit therewith. The central conductive core 302 is disposed within the outer sheath 304, being substantially coaxial therewith. The conductive core 302 also has a smaller diameter than the outer sheath 304 so as to leave an air gap 308 therebetween.
The conductive cylindrical outer sheath 304 is preferably formed from an elastomeric material, such as conductive rubber.
The central conductive core 302 is provided as two semi-cylinders 302a, 302b separated by a divider 314. Each semi-cylinder is preferably formed from an elastomeric conductive material, e.g., conductive rubber, and envelops a low resistance electrical conductor 318, such as discussed above, that is connected to a controller input.
The divider 314 is formed from a nonconductive material, such as rubber, and has a bulbous end portion 320 that contacts the cylindrical outer sheath 304. The divider 314 maintains a minimum spacing between the electrical conductors 318 embedded in the two semi-cylinders 302a and prevents the collapse of the section in the event the coaxial strip sensor 300 is routed with sharp bends thereto.
The spacers/springs 306 are non-conductive resiliently deformable beads that are partially embedded in the semi-cylinders 302a, 302b. About half of the periphery of the spacers/springs 306 project into the air gap 308 so as to contact the conductive outer sheath 304 and prevent self activation of the sensor 300 due to sharp routing bends. The shape, quantity, position and stiffness of the spacers/springs 306 are selected to achieve a desired sensor activation force and travel.
The coaxial nature of sensor 300 enables a wide activation angle as will be appreciated more fully with additional reference to
The coaxial pinch sensor 400 achieves a wide activation range or angle by incorporating a substantially electrically-conductive central core 402 and a substantially coaxial electrically-conductive tubular outer sheath 404 encapsulated by a nonconductive tubular casing 410. The conductive core 402 and conductive sheath 404 are normally spaced apart by an uvula-like base structure 406 projecting from the outer sheath 404, but upon application of a suitable pinch force to deform the casing 410 the conductive outer sheath 404, which is connected to one input of a controller (not shown), will come into contact with the conductive core 402, which is connected to another input of the controller, lowering the resistance therebetween and enabling the controller (not shown) to signal the presence of an obstacle.
More particularly, the coaxial pinch sensor 400 includes a resiliently deformable, non-conductive tubular casing 410, as may be provided by rubber, that forms the outer periphery of the sensor 400. The casing 410 encapsulates the conductive portions of the sensor, protecting it from ambient influences. The casing 410 also defines the stiffness of the section and its appearance. The particular casing 410 illustrated in
The outer sheath 404 is disposed immediately adjacent an inner wall of the casing 410 and is also preferably shaped in the form of a three-quarter cylinder to matingly fit with the casing 410. The conductive core 402 is disposed within the outer sheath 404, being substantially coaxial therewith. The conductive core 402 also has a smaller diameter than the outer sheath 404 so as to leave an air gap 408 therebetween.
The conductive outer sheath 404 is preferably formed from an elastomeric material, such as conductive rubber. The outer sheath 404 includes a base portion 404b that envelops and surrounds a low resistance electrical conductor 418, such as discussed above, that is connected to a controller input.
The uvulate base structure 406 is a nonconductive platform disposed atop the base portion 404b). The conductive core 402, which is preferably formed from an elastomeric conductive material such as conductive rubber is disposed atop the base structure 406 and envelops a low resistance electrical conductor 418, such as discussed above, that is connected to a controller input. The base structure 406 maintains a minimum spacing between the electrical conductors 418 embedded in the core 402 and sheath 404 and prevents the collapse of the section under sharp bends in the coaxial strip sensor 400.
In the illustrated embodiment the conductive core 402 has a substantially three-quarter circle cross-sectional profile. The air gap 408 is preferably crescent or sector shaped in section over an angular range of about two hundred and seventy degrees. The crescent or sector shape of the air gap 408, coupled with the three-quarter circular shape of the conductive core, provides a relatively uniform depth d across the air gap 408 and thus a relatively constant activation travel over a wide range of pinch directions. This will be appreciated more fully with additional reference to
While the above describes a particular embodiment(s) of the invention, it will be appreciated that modifications and variations may be made to the detailed embodiment(s) described herein without departing from the spirit of the invention.
This application claims priority to U.S. Provisional Patent Application No. 61/267,574, which is incorporated by reference herein in its entirety.
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