Abstract
Environmental targets and fuel consumption reduction are changing the transmission system industry. Efforts to improve the energy efficiency of transmission systems have led to increasingly complex systems. Size and weight reduction, together with an increased number of gears currently challenge the sensing capabilities of the transmission speed sensors. Usually metal tone wheels are used as targets for transmission speed sensors. There is no standard shape for target wheels therefore the magnetic signal is not easily predicted. It depends on many variables; for instance, the transmission supplier, the transmission type and the size of the transmission and the car design. Therefore a design for a transmission speed sensor may encounter a wide variety of input signals. Infineon’s next generation of speed sensors for transmission systems optimize performance in exotic target wheels and offer high reliability of the output signals thanks to an advanced signal processing and a sophisticated vibration suppression algorithm. This paper will give an overview of the most recent improvements for speed sensors based on the Hall effect. Diagnosis possibilities as well as improvements in vibration suppression will be presented and discussed.
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