Fabrication of a Novel Contactless Switch Using Eddy Current Displacement Sensor for Safer Vehicle Brake System
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- Fabrication of a Novel Contactless Switch Using Eddy Current Displacement Sensor for Safer Vehicle Brake System
- Kim, Young Su; Choi, Yun Ho; Lee, Jung Min; Noh, Jong Sang; Kim, Jae Joon; Bien, Franklin
- Air-gaps; Automobile applications; Automotive-grade; Brake switch; Brake systems; Contact points; Contact switches; contactless; Contactless switches; Conventional brake system; Displacement sensor; Eddy current displacement sensors; Harsh environment; Input voltage ranges; Measurement results; Over current; Reliable performance; Switching speed; Vehicle brakes
- Issue Date
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, v.60, no.4, pp.1485 - 1495
- Conventional brake systems using a mechanical-structure-based contact switch with a metal spring suffer from frequent malfunction problems over time caused by unstable contacts stemming from loose tension of the spring, a faulty air gap, and damage to the contact point due to overcurrent from load. In this paper, a novel contactless switch for brake systems using an eddy-current displacement sensor is proposed, fabricated, and verified to have reliable performance that overcomes conventional contact switch problems. A proposed contactless switch was fabricated using automotive-grade surface-mount devices (SMDs) on both sides of an FR-4 printed circuit board for low-cost implementation. The measurement result shows a switching speed of less than 49.7 mu s, on average, which is approximately ten times faster than conventional mechanical-structure-based contact switches. The overall dimension of the proposed switch is 36 mm x 26 mm x 64 mm, which can fit into most brake switch housings. The operating input voltage range is from +8 V to +22 V, with the temperature ranging from -40 degrees C to +85 degrees C, showing reliable performance under harsh environment test for automobile applications.
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