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| Research on the Influences of Fuel Injection Parameters on Low Temperature Starting Combustion and Performance of Hybrid Diesel Engines |
| DOI：10.13949/j.cnki.nrjgc.2025.02.003 |
| Key Words:hybrid diesel engine low temperature cold start fuel injection strategy |
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| Abstract:In response to the complex influencing factors of low-temperature cold start characteristics and high starting energy consumption in diesel electric hybrid mode， low-temperature cold start test research on hybrid diesel engines was constructed， a low-temperature environment test platform for hybrid diesel engines was built， and the laws of diesel engine fuel injection control parameters on combustion characteristics and starting transient characteristics were explored. The results show that as the cyclic fuel injection rate increases， the combustion starting point moves forward and the average indicated pressure increases， but the growth rate slows down. The total starting time decreases significantly， and the total starting energy consumption first decreases and then increases. At a cyclic fuel injection rate of 36 mg， better starting performance and energy efficiency are achieved. As the fuel injection timing is delayed， the ignition delay period gradually shortens， the combustion center moves backwards， and the maximum explosion pressure first increases and then decreases. When the fuel injection timing is -12° after top dead center（ATDC） and -8°ATDC， the heat release from combustion is more concentrated， and the fuel energy is effectively utilized. Based on the analysis of combustion characteristics and energy consumption balance during the comprehensive starting stage， when the cyclic fuel injection amount is 36 mg and the fuel injection timing is -8°ATDC， the combustion becomes more concentrated， energy consumption is reduced by 8.4%， and the starting speed is increased by 7.7%. |
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