CAJ | 학술논문

柴油机高压共轨燃油系统中,共轨压力决定了燃油喷射压力,共轨压力随不同工况的调节能力及其压力的稳定性从根本上影响着系统性能.针对共轨压力控制,设计了模糊PID控制器,增加了积分分离与轨压预控制技术,给出了共轨压力的控制策略和实现方法.通过对PID参数的在线自适应整定,实现了在不同柴油机工况下对不同共轨压力变化的最佳控制.台架实验结果表明,共轨压力随柴油机转速与单次喷油量的增加应相应提高;当柴油机转速较高时,PID控制器应采用较大的控制参数;轨压预控制可有效地减少轨压波动和缩短轨压稳定时间;提出的控制策略和实现方法可把轨压控制偏差稳定在1.7%以下.
시유궤고압공궤연유계통중,공궤압력결정료연유분사압력,공궤압력수불동공황적조절능력급기압력적은정성종근본상영향착계통성능.침대공궤압력공제,설계료모호PID공제기,증가료적분분리여궤압예공제기술,급출료공궤압력적공제책략화실현방법.통과대PID삼수적재선자괄응정정,실현료재불동시유궤공황하대불동공궤압력변화적최가공제.태가실험결과표명,공궤압력수시유궤전속여단차분유량적증가응상응제고;당시유궤전속교고시,PID공제기응채용교대적공제삼수;궤압예공제가유효지감소궤압파동화축단궤압은정시간;제출적공제책략화실현방법가파궤압공제편차은정재1.7%이하.
The fuel injection pressure rests with the pressure in the common rail of common rail fuel injection system.The performance of system is influenced severely by the adjustment and stability of rail pressure depending on certain operating condi-tion.A fuzzy PID is designed;the technologies of integrator separateness and pre-control for high pressure governing are added; the control strategy and realizing means are introduced.The optimal rail pressure control under different conditions is realized by online adjustment of PID control parameters.The bench test results show that the common rail pressure should increase with adding of engine speeds and injection quantity;governor parameters of PID should be chosen bigger value in high engine speed; a pre-control for high pressure governing based on the operating point is used to reduce delay time and to keep the governor deviation small;the pressure in common rail is kept at an almost constant value which fluctuation range is no more than 1.7% by the recommended control strategy and means.