摘要
为保证批量生产柴油机满足新排放标准要求,须对生产过程中关键参数进行控制.以S1115型柴油机为研究对象,利用燃烧过程分析软件对压缩余隙、喷油器伸出高度、喷油器流量和供油提前角等参数对整机排放性能的影响进行模拟研究,以确定这些关键参数满足非道路柴油机第三阶段排放标准要求的公差控制范围.结果表明:与目前企业的装配参数公差相比,为满足现行非道路柴油机排放标准要求须改变生产条件,通过增加关键参数控制设备,较大幅度地减小装配参数公差; S1115型柴油机的压缩余隙、油嘴伸出高度、喷油器流量和供油提前角控制分别在±0.07 mm,±0.1 mm,±0.07 L·min~(-1),±0.5℃A范围内,才能保证批量生产的柴油机排放性能符合排放法规要求.
In order to ensure the mass production of diesel engines to meet the emission standards, the key parameters in the production process must be controlled. Taking the S1115 diesel engine as the research object, the combustion process analysis software is used to simulate and calculate the impact of the parameters such as the compression clearances, injector protrusion, fuel injector flow, and fuel supply advance angles on the emission performance of the complete machine. These key parameters are made to meet the tolerance control range required by the China Ⅲ emission standard for non-road diesel engines. The results show that compared with the current enterprise's assembly parameter tolerances, the production conditions must be changed to meet the emission standards requirements. By increasing the equipment of key parameters control, the assembly control parameter tolerances can be significantly reduced. For the S1115 diesel engine, the control range of the compression clearances, injector protrusion, fuel injector flow, and fuel supply advance angles are respectively recommended to be ±0.07 mm, ±0.1 mm, ±0.07 L·min~(-1) and ±0.5 ℃A, so as to ensure that the mass production diesel engine emission performance is qualified.
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