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    • Thermodynamic Process of Cold Start of a Diesel Engine in Low Temperature Environment
    DOI：10.13949/j.cnki.nrjgc.2022.01.001
    Key Words:two-cylinder diesel engine  low temperature cold start  thermodynamic process  compression ratio
    Author NameAffiliationE-mail
    ZHAO Liyan* Yunnan Province Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China 724376762@qq.com 
    LEI Jilin* Yunnan Province Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China leijilin@kust.edu.com 
    LIU Yi Yunnan Province Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China  
    DENG Wei Yunnan Province Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China  
    DENG Xiwen Yunnan Province Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China  
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    Abstract:In order to explore the thermodynamic process of cold start of a diesel engine， a small size two-cylinder diesel was analyzed under 293.0 K and 248.0 K ambient temperatures based on cold start test and simulation. A thermodynamic boundary condition model of cold start was proposed， and the lowest values of auxiliary heating that can help diesel engine cold start successfully was obtained. The influence of compression on energy dissipation was discussed. Results showed that in the process of cold starting， the largest proportion of energy loss was the heat transfer loss of the working medium in the cylinder to the wall of the combustion chamber. The energy dissipation fluctuated greatly in the stage of rotating speed rise， while the energy distribution tended to be stable in the stage of warm-up and idle speed stability. When the ambient temperature was 293.0 K and 248.0 K， the ratios of heat transfer loss of working medium in cylinder to combustion chamber wall were 38.55% and 36.40%， respectively. The ratios of exhaust energy loss were 24.32% and 32.79%， respectively， and the ratios of friction work loss were 35.43% and 25.38%， respectively. The minimum auxiliary heating was 1 648.80 J at ambient temperature of 248.0 K. With the increase of compression ratio， the combustion delay angle， exhaust energy， the heat transfer of working medium to the wall of the combustion chamber， and the energy leakage loss of working medium in the cylinder all showed a trend of increasing first and then decreasing， while the friction work loss showed a trend of decreasing. The turning point of all energy trends occurred at 1.90 s in the speed rise stage.
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