METHOD OF DESIGNING CONTROL LOGIC OF COMPRESSION IGNITION TYPE ENGINE

• Main Authors: OURA TAKUYA, NISHIDA TOMOHIRO, TOKUNAGA TATSUHIRO, INOUE ATSUSHI, CHIKADA TETSUYA, MARUYAMA KEIJI, SUEOKA KENYA, KAWAI YUSUKE
• Format: Patent
• Language: English; Japanese
• Published: 28.11.2019
• 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; WEAPONS

To provide a method of designing a control logic of a compression ignition type engine.SOLUTION: A control part of an engine 1 outputs a signal to each of a fuel injection part and a variable valve mechanism to make a G/F leaner than a theoretical air-fuel ratio and an A/F equal to or richer than the theoretical air-fuel ratio, and a signal to an ignition part so that after the ignition part ignites an air-fuel mixture in a combustion chamber, an unburned air-fuel mixture burns with self ignition. A method of designing a control logic includes the steps of defining a boost pressure P by a super charger, and determining a control logic defining a valve closing timing IVC of an intake valve. The valve closing timing IVC(deg. aBDC) is defined so as to satisfy that the boost pressure P(kPa) is P≥8.0×10-IVC-1.0×10IVC+3.0×10IVC-4.0×10IVC+0.0068IVC-0.3209IVC+116.63.SELECTED DRAWING: Figure 23 【課題】圧縮着火式エンジンの制御ロジックを設計する方法を提供する。【解決手段】エンジン１の制御部は、Ｇ／Ｆが理論空燃比よりもリーンでかつＡ／Ｆが理論空燃比又は理論空燃比よりもリッチになるよう燃料噴射部及び可変動弁機構のそれぞれに信号を出力すると共に、点火部が燃焼室内の混合気に点火した後で未燃混合気が自己着火により燃焼するよう点火部に信号を出力する。制御ロジックを設計する方法は、過給機による過給圧Ｐを定めるステップと、吸気弁の閉弁タイミングＩＶＣを定めた制御ロジックを決定するステップと、を備える。過給圧Ｐ（kPa）が、Ｐ≧8.0×10-11ＩＶＣ6−1.0×10-8ＩＶＣ5＋3.0×10-7ＩＶＣ4−4.0×10-6ＩＶＣ3＋0.0068ＩＶＣ2−0.3209ＩＶＣ＋116.63を満足するように、閉弁タイミングＩＶＣ（deg.aBDC）を定める。【選択図】図２３