Robert Boschgmbh

Stefan Meyer

Hansjoerg Hachtel

Matthias Entenmann

With a method for the contactless determination of a thickness of a layer () made of electrically-conductive material of a component (), a sensor composed of a coil form () and a coil () is positioned in the vicinity of the component () to be measured. The method is based on a combination of the principles of induction and eddy current. The thickness of the layer () is determined using a plurality of measuring and evaluation steps in which the coil () is acted upon with a first alternating current frequency f and its inductance and resistance values are evaluated. The distance between the coil form () and, therefore, the coil (), and the component () is derived from the resistance value R of the coil () acted upon with alternating current frequency f.

Method for the contactless determination of a layer thickness via resistance and inductance measurement of a sensor oil

With a method for the contactless determination of a thickness of a layer () made of electrically-conductive material of a component (), a sensor composed of a coil form () and a coil () is positioned in the vicinity of the component () to be measured. The method is based on a combination of the principles of induction and eddy current. The thickness of the layer () is determined using a plurality of measuring and evaluation steps in which the coil () is acted upon with a first alternating current frequency fand a second alternating current frequency f, and its change in inductance is evaluated. The distance between the coil form () and, therefore, the coil (), and the component () is derived from the inductance value of the coil () acted upon with the second alternating current frequency f

Method for the contactless determination of a thickness of a layer made of electrically-conductive material

A known fuel injection apparatus, in which fuel and foreign matter outside the fuel injection valve can not flow past the injection valves because a flow opening is disposed between fuel supply conduit and fuel outlet conduit and of which degassing of the fuel takes place before it enters the injection valve, any foreign matter entrained in the fuel will not give rise to malfunctions in a pressure regulation. The penetration of foreign matter into the pressure regulator is prevented by means of an appropriate choice of the dimensions of the flow opening, which is provided between a filter element of the fuel injection valve and the wall of a receiving bore. The fuel injection apparatus is employed in fuel injection systems for mixture compressing internal combustion engines with externally supplied ignition.

Growing community of inventors

Schwieberdingen, Germany

Stefan Meyer