Magnetic sensors are widely used in modern cars for example as wheel speed sensors for ABS or to determine crank shaft position in motor management systems. Increasing demand for larger air gaps and better noise performance (lower jitter) requires sensor principles with higher sensitivities compared to the currently used devices. The presented approach with the monolithic integration of GMR (Giant-Magneto-Resistors) sensing elements on top of the signal conditioning ASIC provides a smart, single chip sensor solution which combines superior performance with high reliability. The presented family of GMR based wheel speed sensors covers a wide range of automotive applications where speed and direction information is required together with precise timing (low jitter) and high air-gap capability. The described sensors can be used with a magnetized pole wheel or in a backbias configuration with a ferromagnetic target wheel.
Speed sensors for automotive applications based on integrated GMR technology
Geschwindigkeitssensoren auf der Grundlage von integrierter GMR (Riesenmagnetwiderstands)-Technik für den Einsatz im Fahrzeug
2008
17 Seiten, 16 Bilder, 3 Quellen
Conference paper
English
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