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. 05, 2002
Filed:
Mar. 13, 2001
Marco Berti, Turin, IT;
Piero Carbonaro, Turin, IT;
Daniele Ceccarini, Rimini, IT;
Luca Poggio, Spinetta Marengo, IT;
Magnetic Marelli S.p.A., , IT;
Abstract
A circuit for monitoring and diagnosing an oxygen probe provided with a sensitive cell connected between a first and a second signal terminal, and a heating member connected between a battery and a heating terminal; the circuit includes an interface stage and a control unit. The interface stage includes a first resistor connected between a switch which is normally open and a supply line at a known potential and the first signal terminal, a second resistor connected between the first signal terminal and a second signal terminal and a third resistor connected between the second signal terminal and reference potential line. The control unit further includes a first analog-digital converter connected to the first signal terminal and a second analog-digital converter connected to the second signal terminal.