IGNITER AND VEHICLE, CONTROL METHOD FOR IGNITION COIL

• Main Authors: TANIGAWA HIROYUKI, OBE YUYA
• Format: Patent
• Language: English; Japanese
• Published: 23.05.2016
• Subjects: BASIC ELECTRIC ELEMENTS; BLASTING; COMBUSTION ENGINES; CORONA DEVICES; ELECTRICITY; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES; LIGHTING; MECHANICAL ENGINEERING; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARK GAPS; SPARKING PLUGS; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES; WEAPONS

PROBLEM TO BE SOLVED: To provide an igniter, capable of soft shutoff with a small circuit scale.SOLUTION: A determination stage 300A generates a determination signal Sby comparing a voltage V, which corresponds to an ignition signal IGT, to a reference voltage V. A driving stage 300B controls on/off of a switching element 202 corresponding to the determination signal S. A timer circuit 322 asserts an energization protection signal S11 if the determination signal Skeeps assert level state corresponding to on-state of the switching element 202 for a prescribed energization protection time. A time-varying voltage generation circuit 324 generates a time-varying voltage Vwhich drops in time from an initial voltage, triggered by the assert of the energization protection signal S11. An amplifier 326 varies a voltage of a control terminal of the switching element 202 so as to a detection voltage V, which corresponds a coil current Iflowing the switching element 202, approaches to the time-varying voltage V.SELECTED DRAWING: Figure 4 【課題】小さな回路規模でソフトシャットオフが可能なイグナイタを提供する。【解決手段】判定ステージ３００Ａは、点火信号ＩＧＴに応じた電圧ＶＩＮを基準電圧ＶＲＥＦと比較し、判定信号ＳＤＥＴを生成する。駆動ステージ３００Ｂは、判定信号ＳＤＥＴに応じてスイッチ素子２０２のオン、オフを制御する。タイマー回路３２２は、判定信号ＳＤＥＴがスイッチ素子２０２のオンに対応するアサートレベルである状態が、所定の通電保護時間にわたり持続すると、通電保護信号Ｓ１１をアサートする。時変電圧生成回路３２４は、通電保護信号Ｓ１１のアサートを契機として、初期電圧から時間とともに低下する時変電圧ＶＳＳＯを生成する。アンプ３２６は、スイッチ素子２０２に流れるコイル電流ＩＣに応じた検出電圧ＶＣＳが時変電圧ＶＳＳＯに近づくように、スイッチ素子２０２の制御端子の電圧を変化させる。【選択図】図４