IGNITION TIMING CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

• Main Authors: HANAI NORIHITO, YAMAGUCHI MASAAKI, KANEKO MASATO, ITO HISAYUKI, HOSOKI TAKAYUKI, SENDA KENJI
• Format: Patent
• Language: English; Japanese
• Published: 23.04.2020
• Subjects: BLASTING; COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES; LIGHTING; MECHANICAL ENGINEERING; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES; WEAPONS

To provide an ignition timing control device of an internal combustion engine capable of suppressing hammering sound.SOLUTION: A CPU 52 determines whether vibration strength in a prescribed frequency band as resonance frequency band in accompany with knocking, is a knocking determination value or more, or not on the basis of a band-pass filter processing of an output signal Sn of a knocking sensor 64, and delays an ignition timing in a case when it is the knocking determination value or more. The CPU 52 delays the ignition timing in a case when vibration strength in a specified frequency band of a frequency lower than the prescribed frequency band is over an allowable upper limit value even when it is less than the knocking determination value.SELECTED DRAWING: Figure 1 【課題】打音を抑制できるようにした内燃機関の点火時期制御装置を提供する。【解決手段】ＣＰＵ５２は、ノッキングセンサ６４の出力信号Ｓｎのバンドパスフィルタ処理に基づき、ノッキングに伴う共振周波数帯である所定周波数帯における振動強度がノッキング判定値以上であるか否かを判定し、ノッキング判定値以上である場合には、点火時期を遅角する。ＣＰＵ５２は、ノッキング判定値未満であっても、所定周波数帯よりも低周波の規定周波数帯における振動強度が許容上限値を超える場合、点火時期を遅角する。【選択図】図１