Patent · US Expired

Method and device for machine diagnosis, especially for transmission diagnosis

US6895808B2 · kind B2 · utility

4Cited by

3References

5Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Hubert Remmlinger · Friedrichshafen, DE
Robert Ingenbleek · Kreßbronn, DE
Gabriele Schuwerk · Ravensburg, DE
Rolf Schmitz · Mies, CH

Key dates

Filing date	Jul 3, 2003
Grant date	May 24, 2005
Priority date	—
Expiry date	Jul 3, 2023

Classification

Technology area (CPC G)Physics
CPC primaryG01N33/2858
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

The present invention concerns a method and a device for machine diagnosis and, in particular, for transmission diagnosis in a machine or motor vehicle. The measurement system, according to the invention, comprises a coil (2) wound on a coil core (11), on the surface of which ferritic wear particles (3) to be detected accumulate. Opposite the coil (2) a rotating toothed wheel (6) is arranged which influences the inductance of the coil (2). The output signal of the coil (2) is pulsed with a constant amplitude, the pulse frequency depends on the rotation speed of the toothed wheel (6). Deviations of the amplitude are attributable to the accumulation of ferritic wear particles (3) on the coil (2) and therefore provide a measurement of the condition of the machine or transmission.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.