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    • Effects of Multiple Injection on Cold Start Characteristics of A Diesel Engine at -43 ℃
    DOI：10.13949/j.cnki.nrjgc.2023.05.002
    Key Words:diesel engine  cold start  multiple injection  combustion  idlingspeed stability
    Author NameAffiliationE-mail
    DONG Wenlong* Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China 1375808709@qq.com 
    WAN Mingding Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China 915389147@qq.com 
    WANG Zhengjiang Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China 369944211@qq.com 
    WANG Xiaoyu Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China 1371434385@qq.com 
    SHEN Lizhong* Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China lzshen@foxmail.com 
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    Abstract:In order to improve the starting performance and idling stability of diesel engines under extremely cold conditions， a cold starting test was conducted at -43 ℃ based on a diesel engine towed by an integrated starter/generator motor. The effects of 3 injection modes， i.e. single injection， double injections （pilot injection 1+main injection） and triple injections （pilot injection 2+pilot injection 1+main injection） on the cold starting process and combustion characteristics of diesel engine were studied， and the effects of different injection combinations on the cold starting process of diesel engines under extreme cold conditions were analyzed. Results showed that at the ambient temperature of -43 ℃， the cold start performance of the diesel engine with triple injections was significantly better than that of single and double injections. With the increase in the number of injections， the peak values of in-cylinder pressure in the first cycle of starting combustion rose， the peak phase was advanced， the peak values of pressure rise rate and instantaneous heat release rate decreased significantly， and the ignition delay period was shortened. In the cold start process compared to single injection， the number of cycles required in the reversed towing stage and the acceleration stage was reduced by 9 and 22 for double and triple injections， respectively， and the maximum combustion pressure was increased and the cycle variation rate was reduced by 37.7% and 46.8%， resulting in shortening of the start-up time by 0.88 s and 2.58 s， and reduction in cumulative oil volume by 511 mg and 1 290 mg. In the idling process after starting， the idle speed fluctuation rate was reduced by 54.2% and 82.2%， and the idle speed stability was significantly improved with the increase of injection number. The research results can provide a theoretical basis for the control and parameter calibration of diesel engine cold starting process under extremely cold conditions.
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