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1. JP1998318114 - IONIC CURRENT DETECTING DEVICE

Office
Japan
Application Number 1997125660
Application Date 15.05.1997
Publication Number 1998318114
Publication Date 02.12.1998
Grant Number 3129403
Grant Date 17.11.2000
Publication Kind B2
IPC
F02P 17/12
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
PIGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
17Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
12Testing characteristics of the spark, ignition voltage or current
G01M 15/00
GPHYSICS
01MEASURING; TESTING
MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
15Testing of engines
CPC
F02P 17/12
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
PIGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
17Testing of ignition installations, e.g. in combination with adjusting
12Testing characteristics of the spark, ignition voltage or current
Applicants TOYOTA MOTOR CORP
トヨタ自動車株式会社
DENSO CORP
株式会社デンソー
Inventors NAKADA KOICHI
中田 浩一
MOGI KAZUHISA
茂木 和久
KUREBAYASHI YOICHI
紅林 洋一
Agents 石田 敬
土屋 繁
戸田 利雄
西山 雅也
Title
(EN) IONIC CURRENT DETECTING DEVICE
(JA) イオン電流検出装置
Abstract
(EN)

PROBLEM TO BE SOLVED: To make compatible both control for an ionic current output voltage to allow it to be processed in a post stage processing device and shortening of decay time for LC resonance relating to an ignition coil.

SOLUTION: An ionic current flows to one end of a capacitor 11 from the other end of the capacitor 11 via an ignition secondary coil 1b, an ignition plug 4, an ionic current detecting resistance 15 and a load resistance 14. A voltage expressed in terms of '-ionic current value detected resistance value' is found in a connecting point between the resistances 15 and 14, and inverted in an inversion circuit 16 to be supplied to a processing circuit 20 as an ionic current output. A resistance value R1 of the resistance 15 and a resistance value R2 of the resistance 14 are selected to satisfy both conditions that the ionic current output does not exceed a power source voltage and that a noise by the ignition coil(LC resonance current) is attenuated quickly to get small.

COPYRIGHT: (C)1998,JPO

(JA)


【課題】 後段の処理装置における処理が可能なように
イオン電流出力電圧を抑制することと、点火コイルに関
係するLC共振の減衰時間を短縮することとの両立を図
る。


【解決手段】 イオン電流は、コンデンサ11の一端か
ら、点火コイル二次巻線1b、点火プラグ4、イオン電
流検出抵抗15及び負荷抵抗14を介して、コンデンサ
11の他端へと流れる。
イオン電流検出抵抗15と負荷
抵抗14との接続点には“-イオン電流値×検出抵抗
値”の電圧が現れ、その電圧は反転回路16において反
転され、イオン電流出力として処理回路20に供給され
る。
イオン電流検出抵抗15の抵抗値R1及び負荷抵抗
14の抵抗値R2は、イオン電流出力が電源電圧を超え
ないこと、及び、点火コイルによるノイズ(LC共振電
流)を早く減衰させ小さくすること、の両条件を満たす
ように選択される。

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