摘要
在均质混合气压燃(HCCI)发动机研发中多缸不均匀性是一个重要的问题。通过在缸内直喷汽油机(GDI)上采用两次燃油喷射和可变配气技术来控制缸内混合气形成和燃烧,实现了SI/HCCI复合燃烧方式,研究了汽油HCCI发动机在不同燃烧模式下的多缸燃烧循环波动特性。研究结果表明:在汽油机中低负荷典型工况下,HCCI燃烧pi的缸内循环波动率小于2%,缸间循环波动率小于3%;HCCI发动机缸间循环波动主要受进气量的影响,与SI燃烧模式相比,采用稀燃模式的汽油HCCI燃烧缸间循环波动较小,HCCI燃烧的压力升高率和最高燃烧压力的循环波动率较小。
The cycle-to-cycle and cylinder-to-cylinder variations are the most important issue in developing multi-cylinder gasoline engine of homogeneous charge compression ignition （HCCI） combustion. To achieve SI/HCCI hybrid combustion in a gasoline direct injection engine, the two-stage injection strategy and variable valve technology were utilized for management of the in-cylinder mixture formation and combustion. On this basis the cycle-to-cycle and cylinder-to-cylinder variation characteristics of the gasoline HCCI engine in different combustion modes were examined. Results show that for the gasoline HCCI engine, cycle-to-cycle variation is less than 2 % and cylinder-to-cylinder variation less than 3% in its typical operation conditions at low and mediate load range （2 000 r/rain, 0.2 MPa BMEP）. The cylinder-to-cylinder variation is mainly dominated by the amount of intake charge. Compared with stoichiometrical SI combustion, the lean-burn gasoline HCCI combustion has lower cylinder-to-cylinder and cycle-to-cycle variations either for peak cylinder pressure or for maximum pressure rise rate.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2010年第3期1-6,共6页
Chinese Internal Combustion Engine Engineering
基金
缸内直喷汽油机实现HCCI燃烧的基础研究(2007CB210005)
关键词
内燃机
均质混合气压燃
燃烧
发动机
缸内循环波动
缸间循环波动
IC engine
homogeneous charge compression ignition（HCCI）
combustion
engine
cycle-to-cycle variation
cylinder-to-cylinder variation
