Stroke detection device for e.g. valve in motor vehicle engine, has magnetic sensor that detects the magnetic flux produced by a magnet, and outputs a sensor output corresponding to the stroke of a mechanical element

摘要

A magnetic sensor e.g. Hall element (67) detects the magnetic flux produced by a magnet (66), and outputs a sensor output corresponding to the stroke of a mechanical element (61). The magnet is used to magnetize the mechanical element in the moving direction.