FUEL INJECTION CONTROL DEVICE

• Main Authors: YASUNAGA MANAMI, IDOGAWA MASANAO, KIDO EIICHIRO, YOSHIZAKI SATOSHI
• Format: Patent
• Language: English; Japanese
• Published: 25.02.2022
• Subjects: BLASTING; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; WEAPONS

To suppress a deviation between an actual fuel injection quantity and a target fuel injection quantity.SOLUTION: A fuel injection control device; executes fuel pressure input processing for inputting a detected fuel pressure detected by a fuel pressure sensor at every predetermined time; when a rotation speed of an engine exceeds a predetermined rotation speed, on the basis of the detected fuel pressure inputted in the fuel pressure input processing, estimates a fuel pressure of a low pressure supply pipe at timing when a fuel injection is started from a low pressure fuel injection valve; controls the low pressure fuel injection valve by using a fuel injection time based on the estimated fuel pressure and a target fuel injection quantity; and when the rotation speed of the engine is equal to or lower than the predetermined rotation speed, controls the low pressure fuel injection valve by using a fuel injection time based on a detected fuel pressure inputted from the fuel pressure sensor during a period from when an energization-on command of a solenoid is issued until when the solenoid is energized and on the target fuel injection quantity.SELECTED DRAWING: Figure 3 【課題】実際の燃料噴射量と目標燃料噴射量とのずれを抑制する。【解決手段】所定時間毎に燃圧センサにより検出された検出燃圧を入力する燃圧入力処理を実行し、エンジンの回転数が所定回転数を超えているときには、燃圧入力処理において入力した検出燃圧に基づいて低圧燃料噴射弁から燃料噴射を開始するタイミングにおける低圧供給管の燃圧を推定し、推定した燃圧と、目標燃料噴射量と、に基づく燃料噴射時間を用いて低圧燃料噴射弁を制御し、エンジンの回転数が所定回転数以下であるときには、ソレノイドの通電オン指令がなされてからソレノイドが通電されるまでの間に燃圧センサから入力した検出燃圧と、目標燃料噴射量と、に基づく燃料噴射時間を用いて低圧燃料噴射弁を制御する。【選択図】図３