CAJ | 학술논문

为了解决低温预混合燃烧不稳定的问题，在基于缸压信息的燃烧闭环控制基础上，建立了以θCA50（累计放热50％的曲轴转角）波动率为指标的燃烧状态稳定性评价体系；在分析燃油系统和空气系统控制参数对燃烧状态稳定性影响的基础上，提出了燃烧状态不稳定判据，过滤掉发动机瞬态工况的中低频波动；设计了自适应的燃烧稳定性控制方法，分阶段通过θCA50目标值、新鲜空气流量和燃烧模式的调整来降低燃烧的不稳定性。台架试验结果表明，该控制方法能够在燃烧状态稳定性指标超过限值时，通过调整控制参数自动把指标重新控制在限值以内。
위료해결저온예혼합연소불은정적문제，재기우항압신식적연소폐배공제기출상，건립료이θCA50（루계방열50％적곡축전각）파동솔위지표적연소상태은정성평개체계；재분석연유계통화공기계통공제삼수대연소상태은정성영향적기출상，제출료연소상태불은정판거，과려도발동궤순태공황적중저빈파동；설계료자괄응적연소은정성공제방법，분계단통과θCA50목표치、신선공기류량화연소모식적조정래강저연소적불은정성。태가시험결과표명，해공제방법능구재연소상태은정성지표초과한치시，통과조정공제삼수자동파지표중신공제재한치이내。
For the instability problem of low-temperature PCCI ,the evaluation system ofθCA50 fluctuation ratio for the combus-tion state stability was established based on the closed-loop control of in-cylinder pressure .The influences of fuel and air control parameters on the combustion stability were analyzed and the criterion of unstable combustion was put forward .According to the criterion ,the low frequency fluctuations of engine transient operation were filtered .The self-adaptive control method was designed ,which reduced the instability of combustion by regulating theθCA50 target value ,the fresh air mass flow and combus-tion mode in stages .The test results show that the control method can automatically regulated the control parameters to make the higher stability index drop within the limit .