Eco Holding 1 Gmbh

Jens Moehring

Adrian Eslava Orradre

Toni Schneider

The invention relates to a system for monitoring the position of the valve needle of an expansion valve, having an expansion valve having a valve seat; a valve needle which is configured so as to be convertible axially between a first position in which the valve needle is received by the valve seat and closes the expansion valve, and a second position in which the valve needle is axially spaced apart from the valve seat and the expansion valve is at least partially opened; wherein the expansion valve has a magnet which is fixedly assigned to the valve needle such that the magnet is axially movable conjointly with the valve needle; and has a Hall sensor, wherein the Hall sensor is fixedly assigned to the valve seat and, by means of the flux density vector of the magnet, is configured for determining directly the absolute axial position of the valve needle. The invention moreover relates to a system for calculating the axial position of a valve needle in an expansion valve according to one of the embodiments described, wherein the system, by means of the Hall sensor, is configured for detecting a first component of the flux density vector of the magnet, by means of the Hall sensor is configured for detecting a second component of the flux density vector of the magnet, and for calculating therefrom the absolute axial position of the valve needle.

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Nürtingen, Germany

Jens Moehring