CONTROL METHOD FOR ENGINE, AND CONTROL DEVICE FOR THE ENGINE

• Main Authors: YAMAGUCHI NAOHIRO, HITOMI MITSUO, MORIMOTO HIROTAKA, NAKAI EIJI
• Format: Patent
• Language: English; Japanese
• Published: 08.08.2019
• Subjects: BLASTING; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES; WEAPONS

To improve the thermal efficiency of an engine.SOLUTION: A control method for an engine 1 includes a first fuel supply step (6041) in which, at a timing when an ignition part (a spark plug 25) arranged in a combustion chamber 17 creates kindling in the combustion chamber, a fuel supply part (an injector 6) supplies fuel into the combustion chamber to form air-fuel mixture having A/F or G/F leaner than a theoretical air-fuel ratio at least around the ignition part, an ignition step (6042) in which, after the first fuel supply step, the ignition part creates the kindling in the combustion chamber in a compression stroke, and a second fuel supply step (6043) in which, after the ignition step, the fuel supply part supplies the fuel into the combustion chamber so that the fuel concentration of the air-fuel mixture in the combustion chamber becomes rich in the compression stroke.SELECTED DRAWING: Figure 6 【課題】エンジンの熱効率を向上させる。【解決手段】エンジン１の制御方法は、燃焼室１７内に配設された点火部（点火プラグ２５）が燃焼室内に火種を作成するタイミングにおいて、少なくとも点火部の周囲に、Ａ／Ｆ、又は、Ｇ／Ｆが理論空燃比よりもリーンな混合気を形成するように、燃料供給部（インジェクタ６）が燃焼室内に燃料を供給する第一燃料供給ステップ（６０４１）と、第一燃料供給ステップの後、圧縮行程において、点火部が燃焼室内に火種を作成する点火ステップ（６０４２）と、点火ステップの後、圧縮行程において、燃焼室内の混合気の燃料濃度が濃くなるよう燃料供給部が燃焼室内に燃料を供給する第二燃料供給ステップ（６０４３）と、を備える。【選択図】図６