DEVICE FOR DETERMINING THE POSITION OF A PISTON IN A CYLINDER

摘要

A device for determining the position of a piston in a cylinder comprises an ultrasound facility for transmitting ultrasound signals into the inside of the cylinder and for receiving ultrasound signals that are reflected from said piston. A projection is provided on a front surface of the piston and comprises a front surface that is offset by a certain height with respect to the remaining front surface of the piston. The projection is isolated in any piston position that can be reached during operation. The position of the piston is determined by an analytical facility based on the transit time of the ultrasound signals between the ultrasound facility and the front surface of the projection.