Magneti Marelli S.p.a.

Marco Berti

Luca Poggio

Daniele Ceccarini

Piero Maria Carbonaro

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.

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Turin, Italy

Marco Berti