VSS - Variable Reluctance sensor PDF

A document that explains the functionality and uses of variable reluctance sensors (VRS) in automotive applications. It discusses the design and operation of VRS, which are used to measure the position and speed of moving metal components, often in vehicles. These sensors include a permanent magnet, a ferromagnetic pole piece, a pickup coil, and a rotating toothed wheel. VRS are noted for their cost-effectiveness and stability in high-temperature environments. Applications include measuring turbine speed in engines and position control in automobiles. The document also explores the use of VRS as pressure sensors and accelerometers, elaborating on their strain-based mechanism and ability to provide stable measurements despite temperature variations. Diagrams throughout the document illustrate sensor configurations and circuit geometries.