CN109073417B - 用于减震器的感应传感器 - Google Patents

用于减震器的感应传感器 Download PDF

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CN109073417B
CN109073417B CN201780024466.7A CN201780024466A CN109073417B CN 109073417 B CN109073417 B CN 109073417B CN 201780024466 A CN201780024466 A CN 201780024466A CN 109073417 B CN109073417 B CN 109073417B
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ferrite layer
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瑞安·W·艾略特
邵灵敏
肖恩·富勒
本杰明·斯科特·希尔
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    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
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Abstract

用于确定物体的位置的感应传感器组件，包括：在基板上形成的、覆盖在激励和接收线圈上的铁氧体层。连接到目标上的磁体，在覆盖于线圈上的铁氧体的区域中产生虚拟耦合器。用于减震器的应用包括：安装于在防尘罩中的凹部中的传感器模块，以及安装到所述减震器的圆筒管上的磁体。

Description

用于减震器的感应传感器
交叉引用
本申请要求申请号为62/326,208，申请日为2016年4月22日；申请号为 62/329,538，申请日为2016年4月29日；和申请号为62/396,433，申请日为2016 年9月19日的美国临时专利的优先权；这三项专利申请通过引用结合于本申请中。
技术领域
本发明涉及感应传感器，更具体地涉及使用谐振器、激励线圈和接收线圈的感应传感器；谐振器、激励线圈和接收线圈都被耦合以确定物体的位置。
背景技术
感应传感器在本领域中是公知的。典型的感应传感器装置具有激励线圈和接收线圈。谐振器连接到激励线圈。可移动的耦合器耦合到线圈以在接收线圈中产生涡流。耦合器连接到目标。当目标和耦合器移动时，涡流的大小与耦合器的位置成比例地变化。耦合器和目标的位置由人为确定。然而，这些耦合器的缺点在于它们不能使用由诸如铝的导电材料制成的容器。目前已知的感应传感器不能用于目标容纳在铝中的应用中。
发明内容
用于确定目标在相对于传感器可移动的物体上的位置的感应传感器组件包括：基板，具有安装到所述基板的至少一个发射线圈和至少一个接收线圈，连接到所述发射线圈的谐振器，覆盖至少一个所述发射线圈和至少一个所述接收线圈的铁氧体层，连接到所述接收线圈以测量差分耦合并产生信号的处理模块，以及安装到与所述铁氧体层间隔开的所述可移动物体的磁体。
传感器组件的具体应用包括：壳体，安装到所述壳体的传感器模块，和具有至少一个接收线圈和至少一个激励线圈的传感器模块，覆盖所述接收线圈和所述激励线圈的铁氧体层，具有外筒管的减震器和安装在所述外圆筒管上的磁体。
附图说明
图1是根据本发明的传感器的透视局部视图。
图2是根据本发明的磁体和传感器模块的局部剖视图。图2是传感器组件和减震器、耦合器部分的侧视图。
图3是传感器组件与减震器一起使用的侧视图。
图4是安装在用于减震器的防尘罩中的传感器模块的透视图。
图5是防尘罩的剖视图。
具体实施方式
如图1和图2所示的感应式，一种新颖的感应式位置传感器组件10具有基板12，所述基板12具有线圈16，其中线圈16覆盖有一铁氧体层14。一个强永磁体18连接到可移动的目标20上。该磁体18造成在与磁体18相邻的铁氧体层中的一个低磁导率的区域22。该铁氧体层14的耦合器区域22变得饱和。当与铁氧体的相邻不饱和区域24相比时，其中该区域24的磁导率高得多，饱和区域22的磁导率下降到1。饱和区域22然后作为用于线圈16的下层区域的“虚拟耦合器”26。虚拟耦合器26允许谐振器28以与传统的电感耦合器相同的方式激励该激励线圈30并在接收线圈32中产生涡流。合适的铁氧体是具有大于10的高磁导率的铁氧体。铁氧体还应具有超出电感式传感器范围5MHz 的最小涡流损耗。产生的涡流全部与区域或虚拟耦合器距线圈末端的距离成比例。该传感器组件可以与由铝形成的可移动目标一起使用。
用于确定减震器34的位置的传感器组件的具体应用显示在附图3-5，尽管该传感器组件10被示出用于与减震器34一起使用，该传感器组件10可以被用于确定相对于传感器模块可移动的几乎任何目标的位置。该传感器组件10包括传感器模块36，该传感器模块36安装在用于减震器34的防尘罩38中。该磁体18安装在减震器34的铝圆筒管40上。该防尘罩38被定位使得在磁体18 和铁氧体层14之间的具有5-10mm的间隙。该磁体18是20*12*5mm的矩形，并且是完全烧结/压制的铷磁体42。磁体18的强度为0.5T。磁体18的强度根据实际的应用进行选择。外管40相对于防尘罩38和柱塞42的位置可以由传感器组件10确定。
如图3和5所示，防尘罩38具有大体呈圆形的横截面，其纵向具有凹部 44。该凹部44形成来使得传感器模块36保持与磁体18相距预定距离或间隙。凹部44通常为U形，并从该防尘罩38的底部48延伸至顶部46。该防尘罩38 由合适的尼龙挤压而成，并且该防尘罩38与支撑该减震器的柱塞42的构件的一端固定安装在一起。
如图4所示，传感器模块36包括印刷线路板(PWB)50。该印刷线路板 50具有布置在基板12上的激励线圈30和接收线圈32。传感器模块36还包括印刷线路组件(PWA)56。该印刷线路组件56包括谐振器58和ASIC芯片60。该印刷线路组件56是大体矩形的板，并且可以长达200mm。该印刷线路组件 56和印刷线路板50焊接在一起，并且连接器62与模制延伸部64一起安装到印刷线路组件56。该印刷线路板50和印刷线路组件56基于效率的原因是分开的。该印刷线路板50和印刷线路组件56通过端子引脚64被焊接在一起，以完成分组合件。两块板都热熔接到连接器模块，以限制焊接连接上的应力。用于传输该传感器模块的输出的连接器62包覆模制到具有ASIC 60的印刷线路组件 56上。连接器62具有用于连接到车辆中的总线以将信号传递到车辆控制器的端子。多肋硅径向压缩密封件66被环氧化或胶合在防尘盖的通道的相对端上，以密封防尘盖38中的连接器模块。
PCB 50的顶面覆盖有一层铁氧体层14。在优选实施例中，铁氧体层14是约1/10mm厚的柔性片，并且在一侧具有用于安装到PCB50的粘合剂层。柔性铁氧体片允许形成传感器模块的形状以适应环境。同样地，PCB 50可以由柔性材料形成并且覆盖有柔性铁氧体片以形成柔性传感单元，例如管。可以改变铁氧体层的厚度以抵抗杂散磁场。铁氧体层越厚，传感器对抗杂散磁场的影响的能力越强。
如上所述，磁体18在与磁体18相邻的铁氧体层14中形成低磁导率的耦合器区域22。耦合器区域22将激励线圈30 耦合到接收线圈以产生差分耦合。随着目标20和磁体18沿传感器模块纵向移动，电压相对于线圈的参考电压的百分比线性增加。
传感器组件10的主要优点是当其中一个部件是导电材料(例如铝)时能够有效地操作的能力。然而，该模块几乎可以在任何环境中使用，并且可以配置成确定相对于传感器模块呈线性移动的物体的位置，或者可以配置成用于与相对于传感器转动移动的物体一起使用。
因此，对于本领域技术人员来说显而易见的是，本发明的许多变化和改变都在权利要求所限定的本发明的范围内。
10 传感器组件
12 基板
14 铁氧体层
18 磁体
20 目标
22 耦合器区域
24 不饱和区域
26 虚拟耦合器
28 谐振器
30 激励线圈
32 接收线圈
34 减震器
36 传感器模块
38 防尘罩
40 外管
42 柱塞
44 凹部
46 顶部
48 底部
50 印刷线路板
52 激励
54 接收线圈

Claims (14)

1.用于确定物体上的目标的位置的感应传感器组件，所述传感器包括：
基板，其具有安装在所述基板上的至少一个发射线圈和至少一个接收线圈；
连接到所述发射线圈的谐振器；
连接到所述至少一个接收线圈的处理模块，所述处理模块用于测量在所述接收线圈中产生的涡流；
铁氧体层，其具有大于10的磁导率，所述铁氧体层包覆所述至少一个发射线圈和至少一个接收线圈,所述铁氧体层对抗影响至少一个发射线圈和至少一个接收线圈的杂散磁场；
磁体，其安装到与所述铁氧体层间隔开的可移动的物体上，所述磁体产生作用在所述铁氧体层的区域上的磁场，以在靠近所述区域的范围内将所述至少一个发射线圈和所述至少一个接收线圈感应耦合。
2.如权利要求1所述的传感器组件，其中，所述基板为具有顶面的印刷线路板。
3.如权利要求1所述的传感器组件，其中，所述铁氧体层具有带粘合剂的一面。
4.如权利要求2所述的传感器组件，其中，所述铁氧体层安装到所述印刷线路板的所述顶面。
5.如权利要求1所述的传感器组件，其中，所述铁氧体层是柔性的。
6.如权利要求1所述的传感器组件，其中，所述物体由非磁性铝材形成。
7.用于感测减震器的位置的传感器组件，所述传感器组件包括：
壳体；
传感器模块，所述传感器模块安装到所述壳体，所述模块具有至少一个发射线圈和至少一个接收线圈，所述模块还具有铁氧体层，所述铁氧体层包覆所述发射线圈和至少一个接收线圈,所述铁氧体层对抗影响至少一个发射线圈和至少一个接收线圈的杂散磁场；
磁体，所述磁体安装到所述减震器，所述磁体与所述铁氧体层间隔开，所述磁体具有作用在所述铁氧体层上的磁场，以将所述至少一个所述发射线圈感应耦合到所述至少一个接收线圈，以产生表示所述磁体相对于所述壳体的位置的信号。
8.如权利要求7所述的传感器组件，其中，所述壳体具有大体圆形横截面，所述圆形横截面限定了中心腔体。
9.如权利要求7所述的传感器组件，其中，所述壳体具有凹部，所述凹部用于收容所述传感器模块。
10.如权利要求7所述的传感器组件，其中，所述减震器具有相对于杆可动的铝管。
11.如权利要求7所述的传感器组件，其中，所述传感器模块包括连接器。
12.如权利要求7所述的传感器组件，其中，所述传感器模块包括印刷线路板和印刷线路组件。
13.如权利要求12所述的传感器组件，其中，所述印刷线路组件包括谐振器。
14.如权利要求13所述的传感器组件，其中，所述印刷线路板包括至少一个发射线圈和至少一个接收线圈。
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