Patent · US Active

Method and apparatus for monitoring an electromagnetic hydraulic valve for a variable valve timing system

US9207146B2 · kind B2 · utility

0Cited by

1References

13Claims

0Family size

Assignee

Dr. Ing. h.c. F. Porsche AG · DE

Inventors

Thomas Melzig · Leonberg, DE
Stephan Pelters · Tiefenbronn, DE
Arno Wunderlich · Sindelfingen, DE
Lutz Kretzschmar · Duvall, US

Key dates

Filing date	Aug 13, 2014
Grant date	Dec 8, 2015
Priority date	—
Expiry date	Aug 13, 2034

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF01L2820/031
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A method monitors an electromagnetic hydraulic valve for controlling a hydraulically adjustable valve gear of a reciprocating piston engine. The hydraulic valve includes an electromagnetic coil and a moving armature configured to connect a control port hydraulically to a high-pressure port or a low-pressure port, depending on an energization of the coil. The method includes detecting a movement of the armature, using a control unit, in response to an energization of the coil based on a mutual induction in the coil and identifying a defect, using the control unit, if the expected mutual induction does not occur.

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