CONTROL METHOD AND CONTROL DEVICE FOR ENGINE

• Main Authors: FUJIMOTO MASAHIKO, HORI HAYAKI, NAKAMOTO YOSHIHISA, YASUTOMI KATSUAKI, YAMASHITA HIROYUKI, KAMISHIRO TAKEHIRO, SETO SUKETOSHI
• Format: Patent
• Language: English; Japanese
• Published: 02.08.2021
• Subjects: BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; WEAPONS

To provide a control method and control device for an engine capable of reliably improving heat efficiency.SOLUTION: In an engine provided with an intake valve 8, an exhaust valve 9, a fuel supply device 11, and a water injection device 12 that injects water into a combustion chamber 10, in addition to a combustion step of combusting a mixture of fuel and air supplied from the fuel supply device 11 in the combustion chamber 10, during the period from a valve closing timing EVC of the exhaust valve 9 to a valve closing timing IVC of the intake valve 8, a water injection step of injecting water from the water injection device 12 into the combustion chamber 10 is executed. Then, a water injection end crank angle tw_limit (CA), which is a crank angle timing at which the water injection ends, is advanced more when an engine speed is high than when it is low.SELECTED DRAWING: Figure 8 【課題】熱効率を確実に向上させることが可能なエンジンの制御方法および制御装置を提供する。【解決手段】吸気弁８、排気弁９、燃料供給装置１１および燃焼室１０に水を噴射する水噴射装置１２が設けられたエンジンにおいて、燃料供給装置１１から供給された燃料と空気とが混合した混合気を燃焼室１０内で燃焼させる燃焼ステップに加えて、排気弁９の閉弁時期ＥＶＣから吸気弁８の閉弁時期ＩＶＣまでの期間中に水噴射装置１２から燃焼室１０内に水を噴射させる水噴射ステップを実施する。そして、水噴射を終了するクランク角度時期である水噴射終了クランク角ｔｗ＿ｌｉｍｉｔ（ＣＡ）を、エンジン回転数が高いときの方が低いときよりも進角させる。【選択図】図８