Patents by Inventor Helmut Oehler

Helmut Oehler has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Rotational speed measurement with frequency-dependent voltage compensation
    Patent number: 5101155
    Abstract: A circuit for determining the speed of rotation of a wheel, has an inductive transmitter (1), the output of which is connected to a pulse-shaping device (7) whose output is connected to an evaluation device. The inductive transmitter is connected to an evaluation circuit (11) by means of a cable (6). The evaluation circuit is intended, on the one hand, to make certain that the input signal of the inductive transmitter (1) can be evaluated while, on the other hand, it should be able to detect errors which may occur, for instance due to a break in the cable (6) despite the presence of dirt resistances (R.sub.S). For this purpose, an auxiliary circuit (10) is provided which varies the internal resistance of the pulse-shaping device (7) as a function of the speed.
    Type: Grant
    Filed: September 14, 1990
    Date of Patent: March 31, 1992
    Assignee: Fatec Fahrzeugtechnik GmbH
    Inventors: Helmut Oehler, Uwe Marz