A Magnetoelastic based Non-Contacting, Non-Compliant Torque Sensor is being developed by Siemens VDO for automotive transmission applications. Such a sensor would benefit the automotive industry by providing the feedback needed for precise computer control of transmission gear shifting under a wide range of road Conditions and would also facilitate cross-platform usage of a common transmission unit. Siemens VDO has prototyped transmission torque sensors operating on the principle of Inverse-magnetostriction, also referred to as the Inverse-Joule Effect and the Villari Effect. The latest developments in the magnetoelastic torque sensor that are presented here advance the current state of the technology by addressing many obstacles that have delayed its acceptance by the automotive industry. Thermal spray deposition of the magnetoelastic element has resolved problems that have plagued earlier versions of the magnetoelastic torque sensor's active element. The lack of integrity of the shaft/magnetoelastic element interface, stress-corrosion cracking, long term stability, inhomogenity of magnetic properties and manufacturing processes that run counter to high volume production, are no longer hindering the introduction of magnetoelastic torque sensors into the automotive marketplace. With design goals clearly defined and an aggressive development program invariably progressing, the prospect of an automotive, magnetoelastic based non-compliant torque sensor is now more readily attainable. Summarizing, the passive nature of the magnetic sense- element provides an intrinsically simple kernel for the Siemens VDO torque sensor that makes for a highly reliable and stable design. The thermal spray process adds robustness to the mechanical aspect by permitting torque excursions to an unprecedented +/- 2000 % of full scale (per prototype validation testing of certain constructs) without the need for ancillary torque limiting protection devices. Furthermore, accuracy, repeatability, stability, low hysteresis, rotational position indifference, low cost and amenability to the high-volume manufacturing needs of the automotive marketplace are all attributes of this torque sensing technique.
Magnetoelastic torque sensor utilizing a thermal sprayed sense-element for automotive transmission applications
Magnetoelastischer Drehmomentsensor mit thermisch aufgesprühtem Sensorelement für Anwendungen in Kfz-Getrieben
2003
6 Seiten, 8 Bilder, 3 Quellen
Aufsatz (Konferenz)
Englisch
SAE Technical Papers | 2003
|British Library Conference Proceedings | 2003
|Development of a magnetoelastic torque transducer for automotive transmission applications
Kraftfahrwesen | 1997
|Development of a Magnetoelastic Torque Transducer for Automotive Transmission Applications
British Library Conference Proceedings | 1997
|