Misfire detecting device for internal combustion engine

Details Misfire detecting device for internal combustion engine Misfire detecting device for internal combustion engine

1995-12-04

1998-10-27

Nguyen, Vinh P.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

In situ testing of spark plug

123627, F02P 1700

Patent

active

058282173

ABSTRACT:
A misfire detecting device for an internal combustion engine having a double-ended or single-ended distributorless ignition system is provided. The device comprises a first capacitor connected to a secondary winding side of a spark plug and in parallel to the spark plug, the first capacitor being charged by a voltage produced at a secondary winding side of an ignition coil and thereafter applying a voltage to the spark plug when a voltage at the secondary winding side drops, a second capacitor connected in series with the first capacitor and having a capacitance larger than that of the first capacitor to divide a voltage across the first capacitor, and a misfire detecting unit connected to a junction between the first capacitor and the second capacitor to detect a misfire on the basis of a decay characteristic of a divided voltage produced at the second capacitor.

REFERENCES:
patent: 2926301 (1960-02-01), Westberg et al.
patent: 4156839 (1979-05-01), Nakagawa
patent: 5216369 (1993-06-01), Toyama
patent: 5237278 (1993-08-01), Bumen
patent: 5365910 (1994-11-01), Miyata et al.
patent: 5396176 (1995-03-01), Ishii et al.
patent: 5424647 (1995-06-01), Ohsawa
patent: 5503132 (1996-04-01), Miyata et al.

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