Electricity: measuring and testing – Internal-combustion engine ignition system or device – Electronic ignition system
Patent
1997-02-18
2000-03-28
Ballato, Josie
Electricity: measuring and testing
Internal-combustion engine ignition system or device
Electronic ignition system
324399, 324393, 324402, F02P 1700
Patent
active
060436603
ABSTRACT:
A circuit arrangement measures an ion current generated in the combustion chamber of an internal combustion engine during an iron current flow phase following an ignition phase. A voltage drop across a feedback resistor (R.sub.1) connected in parallel to an inverting amplifier is measured since the voltage drop is proportional to the ion current resistance. The amplifier is connected with its inverting input to a low voltage end of a secondary winding of an ignition transformer or coil. The high voltage end of the secondary winding is connected through a spark gap of a spark plug to ground, whereby the spark plug functions as an ion current sensor during the ion current flow phase. Negative voltage peaks flowing during an ignition phase and the ignition current flowing during the ignition phase are diverted through respective first and second circuit branches. The first branch has a first semiconductor diode (D.sub.1) grounding the low voltage end of the secondary winding for discharging the negative high voltage peaks while blocking the ignition current. The other diverting branch has a second semiconductor (D.sub.2) connected in parallel to the inverting amplifier.
REFERENCES:
patent: 5293129 (1994-03-01), Ikeuchi et al.
patent: 5444375 (1995-08-01), Ohsawa et al.
patent: 5483818 (1996-01-01), Brandt et al.
patent: 5493227 (1996-02-01), Shimasaki et al.
patent: 5758629 (1998-06-01), Bahr
Bahr Ulrich
Daetz Michael
Ballato Josie
Daimler-Chrysler AG
Fasse W. F.
Fasse W. G.
Kobert Russell M.
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