The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 11, 2014
Filed:
Apr. 29, 2011
Stephan Bolz, Pfatter, DE;
Stephan Bolz, Pfatter, DE;
Continental Automotive GmbH, Hannover, DE;
Abstract
A circuit arrangement determines the closing instant of a valve with a coil that actuates an armature. The circuit has a voltage divider with at least three resistors connected to a measuring node of the coil and to ground. The first resistor is highly resistant in comparison with the other resistors of the voltage divider. A differential amplifier has its output connected to its inverting input via a fourth resistor and its non-inverting input receives a voltage from the voltage divider that represents the current in the coil. A parallel circuit of a capacitor and a resistor is connected between the inverting input and ground. A controllable switching element has a controlled path between the first resistor and the parallel circuit, and a control connection connected to the positive supply potential of the differential amplifier.