Combustion state detecting apparatus for an internal-combustion

Details Combustion state detecting apparatus for an internal-combustion Combustion state detecting apparatus for an internal-combustion

1997-07-10

2000-03-21

Ballato, Josie

Electricity: measuring and testing

Internal-combustion engine ignition system or device

In situ testing of spark plug

324378, F02P 1700

Patent

active

060406984

ABSTRACT:
A combustion state detecting apparatus for an internal-combustion engine does not incur deteriorated ignition characteristics because the ionic current detecting circuit thereof is not affected by ignition current. The combustion state detecting apparatus is equipped with an ionic current detecting circuit (10A) which includes a biasing device (C) connected to the low voltage end of a secondary winding (2b) of an ignition coil (2) and which detects ionic current (i) flowing from the biasing device via a spark plug (4); rectifying device (5) which is inserted between the biasing device and the secondary winding so that the ionic current flows in the forward direction; a voltage clamping device (6) inserted between the secondary winding and the ground; and an ECU (20) which detects the combustion state according to the ionic current. The biasing device applies a bias voltage (VBi) of the opposite polarity from the high voltage for ignition to the spark; and the voltage clamping device limits a voltage (Vc) at the low voltage end of the secondary winding to a predetermined value when the high voltage for ignition appears, the absolute value of the predetermined value being set to the absolute value or more of the bias voltage.

REFERENCES:
patent: 5207200 (1993-05-01), Iwata
patent: 5230240 (1993-07-01), Ohsawa
patent: 5272914 (1993-12-01), Murata
patent: 5424647 (1995-06-01), Ohsawa et al.
patent: 5483818 (1996-01-01), Brandt

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