Effects of Internal and External EGR and Injection Pressure on Low Temperature Combustion of Diesel Engine

ZHANG Xiangyu; ZHENG Zunqing; LI Yanfang; ZHU Yuxuan; GAO Yingying; YAO Mingfa

doi:10.3969/j.issn.10012222.2017.05.001

Vehicle Engine ›› 2017, Vol. 0 ›› Issue (5) : 1-5. DOI: 10.3969/j.issn.10012222.2017.05.001

Effects of Internal and External EGR and Injection Pressure on Low Temperature Combustion of Diesel Engine

ZHANG Xiangyu1,2，ZHENG Zunqing2，LI Yanfang1，ZHU Yuxuan2，GAO Yingying1，YAO Mingfa2

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Abstract

The combustion and emission characteristics of low temperature combustion at low load were investigated by changing strategies of internal and external EGR and injection pressure on a single cylinder diesel engine equipped with a electrohydraulic variable valve actuator system. The internal EGR was achieved by opening exhaust valve twice during the intake process. The test was conducted at engine speed of 1 500 r/min with 20 mg/cyc fuel injection. The results show that the ultralow NOx emission can be obtained by controlling EGR rates. The soot emission of internal EGR reduces at a high injection pressure，while HC and CO emissions of external EGR reduce at a low injection pressure. For the coupling control strategy of internal and external EGR, the increase of internal EGR ratio can reduce HC and CO emissions at a small range and a higher injection pressure is hence introduced to suppress soot emission. In addition, the increase of the external EGR ratio can achieve higher thermal efficiency.

Key words

diesel engine / exhaust gas recirculation(EGR) / injection pressure / low temperature combustion

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ZHANG Xiangyu，ZHENG Zunqing，LI Yanfang，ZHU Yuxuan，GAO Yingying，YAO Mingfa. Effects of Internal and External EGR and Injection Pressure on Low Temperature Combustion of Diesel Engine[J]. Vehicle Engine. 2017, 0(5): 1-5 https://doi.org/10.3969/j.issn.10012222.2017.05.001