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    • The Influence of Rail Pressure and Injection Timing on the Performance of a China VI Diesel Engine
    DOI：10.13949/j.cnki.nrjgc.2024.03.007
    Key Words:diesel engine  load characteristic  rail pressure  injection timing  temperature
    Author NameAffiliationE-mail
    BI Yuhua Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China 815569621@qq.com 
    ZHANG Kai Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China 2425287683@qq.com 
    HUANG Fenlian* Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China 429019788@qq.com 
    WAN Mingding Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China 915389147@qq.com 
    NIE Xuexuan Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China 1838813119@qq.com 
    YAN Jie Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China 840545183@qq.com 
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    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 loads. With the rail pressure increased by 57 MPa， fuel consumption and exhaust temperature of diesel engine decrease by 16.1 g/（kW·h） and 63 ℃ 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 diesel oxidation catalyst （DOC） front-end temperature T4， diesel particulate filters （DPF） front-end temperature T5 and selective catalytic reduction （SCR） front-end temperature T6， and is more sensitive at low loads. With the injection timing advanced by 6.0°， 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° before top dead center， with temperatures of 315.3， 338.4 and 329.3 ℃ respectively.
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