COMBUSTION CONTROL DEVICE OF ENGINE

• Main Authors: SUNANAGARE TAKETAKA, UJIHARA KENKO, MASUDA YUTA, ASHIKAGA KENSUKE, HIGASHIO MASAYOSHI
• Format: Patent
• Language: English; Japanese
• Published: 27.07.2020
• Subjects: BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES; WEAPONS

To properly set the ignition timing of an engine which performs SPCCI combustion.SOLUTION: A combustion control device comprises an ignition part (ignition plug 25), measurement parts (sensors SW1 to SW17), and a control part (ECU 10). The control part outputs an ignition signal to the ignition part so that partial self-ignition combustion is performed. The control part has: a target value setting part 10a for setting a target value of a combustion noise index (cplf); an mfb50 estimation part 10b for estimating the most retardant position of an mfb50 when an air-fuel mixture performs partial self-ignition combustion on the basis of a self-ignition model; a cplf estimation part 10c for estimating the cplf at combustion in the most retardant position of the mfb50; a target mfb50 calculation part 10d for calculating the mfb50 of the combustion for satisfying the target value of the cplf on the basis of the target value of the cplf, the estimation value of the cplf, and a relationship between the mfb50 and the cplf; and an ignition timing setting part 10e for setting ignition timing being a target mfb50, and outputting the ignition signal.SELECTED DRAWING: Figure 8 【課題】ＳＰＣＣＩ燃焼を行うエンジンの点火時期を適切に設定する。【解決手段】燃焼制御装置は、点火部（点火プラグ２５）と、計測部（センサＳＷ１〜ＳＷ１７）と、制御部（ＥＣＵ１０）と、を備える。制御部は、部分自己着火燃焼が行われるよう、点火部に点火信号を出力する。制御部は、燃焼騒音指標（ｃｐｌｆ）の目標値を設定する目標値設定部１０ａと、自己着火モデルに基づいて、混合気が部分自己着火燃焼を行う場合の、ｍｆｂ５０の最遅角位置を推定するｍｆｂ５０推定部１０ｂと、ｍｆｂ５０の最遅角位置での燃焼時のｃｐｌｆを推定するｃｐｌｆ推定部１０ｃと、ｃｐｌｆの目標値、ｃｐｌｆの推定値、及び、ｍｆｂ５０とｃｐｌｆとの関係、に基づいて、ｃｐｌｆの目標値を満足する燃焼のｍｆｂ５０を算出する目標ｍｆｂ５０算出部１０ｄと、目標ｍｆｂ５０となる点火時期を設定し、点火信号を出力する点火時期設定部１０ｅと、を有している。【選択図】図８