基于涡流位移传感器的新型汽车制动系统无触点开关的研制( Fabrication of a Novel Contactless Switch Using Eddy Current Displacement Sensor for Safer Vehicle Brake System )

YS Kim HC Yun JM Lee JS Noh JJ Kim F Bien Practical/ automotive electronics brakes contactors eddy current braking load (electric) mechanical contact printed circuits road safety sensors springs (mechanical) surface mount technology/ contactless switch fabrication eddy current displacement sensor safer vehicle brake system mechanical-structure-based contact switch metal spring malfunction problems faulty air gap contact point automotive-grade surface-mount devices FR-4 printed circuit board switching speed brake switch housings operating input voltage range automobile applications voltage 8 V to 22 V temperature -40 degC to 85 degC/ B8520B Automobile electronics B7230 Sensing devices and transducers B2180B Relays and switches E3650A Automobile industry E2210 Mechanical components E0240H Health and safety aspects E2140 Tribology (mechanical engineering)/ voltage 8.0E+00 to 2.2E+01 V temperature 2.3315E+02 to 3.5815E+02 K

传统的制动系统使用基于机械结构的带有金属弹簧的接触开关，随着时间的推移，由于弹簧松动张力引起的接触不稳定、空气间隙故障以及由于负载产生的过电流而对接触点造成的损坏而导致频繁的故障问题。本文提出并制作了一种新型的电涡流位移传感器制动系统无触点开关，克服了传统接触式开关存在的问题，具有可靠的性能。为了实现低成本，在FR-4印刷电路板的两侧使用汽车级表面贴装器件(SMD)制造了一种非接触开关。测量结果表明，开关速度平均小于49.7μs，比传统的机械结构触点开关快10倍左右。建议的开关的总体尺寸是36毫米x26毫米x64毫米，可以适合大多数制动开关外壳。工作输入电压范围为+8V至+22V，温度范围为-40℃至+85℃，在汽车应用的恶劣环境测试下表现出可靠的性能。

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