Circuit arrangement for measuring an ion current in a combustion

Details Circuit arrangement for measuring an ion current in a combustion Circuit arrangement for measuring an ion current in a combustion

1997-02-18

1999-06-22

Do, Diep N.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

In situ testing of spark plug

324393, 324402, 73 3508, F02P 1712

Patent

active

059146044

ABSTRACT:
An ion current in the combustion chamber of an internal combustion engine is measured by using the spark plug as an ion current sensor. The ignition circuit arrangement has an ignition coil or transformer with a primary winding forming a primary circuit and a secondary winding forming a secondary circuit in which the spark plug is connected. A measuring voltage is applied to the secondary circuit by circuit components forming a measuring circuit for measuring the ion current. The measuring circuit provides a measuring voltage at a value that is lower than the battery voltage of the ignition system or corresponds to the battery voltage at most. A rectifying element is connected to the secondary circuit which feeds the secondary or ignition current into the battery circuit of the ignition system while an ion current caused to flow by the measuring voltage applied to the secondary circuit is measured between sparking times when no ignition current is flowing.

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: 5548220 (1996-08-01), Kawamoto et al.
patent: 5561239 (1996-10-01), Yasuda

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