Process and apparatus for controlling and measuring the movement of an armature of an electromagnetic switching member

US5245501A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Johannes Locher · Stuttgart, DE
• Hans-Joachim Siebert · Schwieberdingen, DE
• Herbert Graf · Moers, DE
• Nestor Rodriguez-Amaya · Stuttgart, DE
• Anton Karle · Villingen-Schwenningen, DE
• Alfred Schmitt · Ditzingen, DE
• Joachim Tauscher · Stuttgart, DE
• Werner Zimmermann · Putzbrunn, DE
• Dominique Buisson · Vénissieux, FR
• Lucien Hehn · Saint-Étienne, FR
• Pierre Lauvin · Francheville, FR
• Henri Paganon · Vénissieux, FR

Key dates

• Filing date: Jun 26, 1991
• Grant date: Sep 14, 1993
• Expiry date: Jun 26, 2011

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2041/2058
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A process for controlling and measuring the movement of an armature of an electromagnetic switching member with an excitation coil is proposed, which has the following steps: a current (i) or a voltage (u1) is applied to the excitation winding (3) in order to move the armature into a first actuatable position; before the start of the movement of the armature, the current or the voltage is raised above a value at which the armature remains in the actuated position, and before termination of the movement of the armature the current or the voltage is reduced to a defined value, which suffices to hold the armature in the actuated position; finally, the temporal variations in the current or the voltage are measured after setting of the defined value, for the purpose of recognizing the termination of the armature movement. With the aid of this process, it is possible for the movement of the armature, for example of a solenoid valve for a fuel injection device of an internal combustion engine, to be very precisely monitored, so that the injection instant and injection period can be optimally set.