CAJ | 학술논문

建立了直喷汽油机的三维数值模型和运动学模型，并进行了试验验证。模拟了直喷汽油机在直接起动过程中不同喷油策略和点火时刻下的燃烧特性、反转和正转过程的运动特性。结果表明：与单次喷油相比，采用两次喷油策略时，首个着火气缸内混合气燃烧后的最大气缸压力较大，而且其大小受到点火时刻的影响；首个着火气缸内混合气燃烧后的最大气缸压力较大，则直喷汽油机反转过程中转过的最大角度较大；在各种喷油条件下，第2个着火气缸在反转到其最大转角前2°左右点火，正转过程转速较高，有利于直喷汽油机的直接起动。
건립료직분기유궤적삼유수치모형화운동학모형，병진행료시험험증。모의료직분기유궤재직접기동과정중불동분유책략화점화시각하적연소특성、반전화정전과정적운동특성。결과표명：여단차분유상비，채용량차분유책략시，수개착화기항내혼합기연소후적최대기항압력교대，이차기대소수도점화시각적영향；수개착화기항내혼합기연소후적최대기항압력교대，칙직분기유궤반전과정중전과적최대각도교대；재각충분유조건하，제2개착화기항재반전도기최대전각전2°좌우점화，정전과정전속교고，유리우직분기유궤적직접기동。
A three-dimensional model and a one-dimensional kinematics model for a direct injec-tion gasoline engine were established and validated through engine experiments.The combustion characteristics in the first firing cylinder and the kinematics characteristics of the engine under the conditions of forward and reverse rotation were simulated when different fuel injection methods and spark ignition timings were employed at direct start.The results show that the peak cylinder pressure in the first firing cylinder after combustion in the cases of split injection is higher than that at single injection.But its magnitude is affected by spark ignition timing.Higher peak cylinder pressure increa-ses the crank angles,which the engine can move in the reverse rotation direction.The engine speed in the forward rotation direction is the largest when the sequent cylinder is ignited at about 2°before the biggest reverse crank angles in both single injection and split injection,which is helpful to a successful direct start.