国六柴油机轨压和喷油正时对柴油机性能的影响
The influence of rail pressure and injection timing on the performance of China VI diesel engine
关键词:柴油机  负荷特性  轨压  喷油正时  温度
Key Words:diesel engine  load characteristic  rail pressure  injection timing  temperature
基金项目:国家自然科学基金重点项目(52066008)；云南省科技厅重大科技专项(202102AB080007)；云南省重点研发计划专项(202103AA080002)
作者单位邮编
毕玉华 昆明理工大学 650500
张凯 昆明理工大学 
黄粉莲* 昆明理工大学 650500
万明定 昆明理工大学 
聂学选 昆明理工大学 
严杰 昆明理工大学 
摘要:为优化柴油机性能，基于一台配备了完整国Ⅵ后处理系统的高压共轨直列四缸柴油机,开展了柴油机负荷特性研究,在此基础上研究轨压和喷油正时对柴油机性能的影响。研究结果表明：以适当较小的轨压配合较为提前的喷油正时可以达到较为理想的柴油机油耗以及排放；轨压和喷油正时对HC排放的影响较小；轨压对柴油机油耗、排温、NOx排放、CO排放的影响较大,且在中等偏大负荷时更为敏感,随着轨压增加了57MPa,柴油机油耗、排温分别下降了16.1 (g.(kW.h)-1)、63℃,NOx排放上升了663×10-6,CO排放下降了785×10-6；喷油正时对烟度以及DOC前端温度(T4)、DPF前端温度(T5)、SCR前端温度(T6)三个温度的影响较大,且在小负荷时更为敏感。随着喷油正时提前6 °CA,烟度下降了0.43%,T4、T5、T6峰值出现在轨压为76 MPa,喷油正时为7.5 °CA(BTDC)时,温度分别为315.3、338.4、329.3℃。
Abstract:To optimize the performance of diesel engine, Based on a high-pressure common rail inline four-cylinder diesel engine equipped with a complete China VI aftertreatment system, the load characteristics of the diesel engine were studied. On this basis, the effects of rail pressure and injection timing on the performance of the diesel engine were studied. The results show that the ideal fuel consumption and emission of diesel engine can be achieved by appropriately smaller rail pressure and earlier injection timing. Rail pressure and injection timing have little effect on HC emissions. Rail pressure has a great influence on fuel consumption, exhaust temperature, NOx emission and CO emission of diesel engine, and it is more sensitive at medium and large load. With the rail pressure increased by 57 MPa, fuel consumption and exhaust temperature of diesel engine decrease by 16.1 (g.(kW.h)-1) and 63 °C respectively, NOx emission increases by 663×10-6 and CO emission decreases by 785×10-6. The injection timing has a great influence on the smoke level and DOC front-end temperature (T4), DPF front-end temperature (T5) and SCR front-end temperature (T6), and is more sensitive at low load. With the injection timing advanced by 6 °CA, the smoke level decreased by 0.43%. T4, T5 and T6 peaks occur at a rail pressure of 76 MPa and an injection timing of 7.5 °CA(BTDC), with temperatures of 315.3, 338.4 and 329.3 °C respectively.
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