Patent · US Expired

Method for monitoring a cylinder valve, actuated via an electromagnetic actuator, in a piston-type internal combustion engine

US5791305A · kind A · utility

8Cited by

3References

1Claims

0Family size

Assignee

FEV Motorentechnik GmbH & Co., KG · DE

Inventors

Lutz Kather · Würselen, DE
Guenter Schmitz · Oldenburg, DE
Ekkehard Schrey · Aachen, DE

Key dates

Filing date	Aug 8, 1996
Grant date	Aug 11, 1998
Priority date	—
Expiry date	Aug 8, 2016

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF01L9/20
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A method is provided for monitoring a cylinder valve which is actuated by an electromagnetic actuator including an electromagnet having a magnetic core presenting a pole face and a coil wound around the magnetic core, a return spring and an armature that can be moved by the electromagnet in a direction toward the pole face counter to a force of the return spring for acting upon the cylinder valve. The method includes: measuring a value of one of (a) a time until current in the coil drops to a predetermined lower value after a switching of the current flowing through the coil, (b) a voltage at the coil subsequent to the switching of the current to the coil, (c) the voltage at the coil at a time of maximum approach of the armature to the pole face, and (d) the voltage at the coil at a time subsequent to the time of maximum approach of the armature to the pole face; comparing the measured value to a predetermined value; and generating a signal if a deviation is detected between the measured value and the predetermined value.

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