Experimental study on low-temperature cold start performance of a diesel engine
LÜ Enyu
YU Lei
ZHU Bo
HE Jie
Abstract：In order to improve the cold start performance of diesel engine,based on a 2.5L diesel engine with preheating mode of intake heater,a cold start experiment is carried out under extremely cold ambient temperature of-30℃.And the effects of compression ratio,throttle opening,preheating mode and fuel injection control strategy on the cold start performance of diesel engine are studied.The experiment results show that when the compression ratio is 17.0 and the intake heater is used,the diesel engine takes a long time to heat up and consume a lot of power,it cannot be started normally.Increasing the compression ratio and throttle opening can increase the pressure and temperature of the mixture in the cylinder at the end of compression,and improve the cold start performance of diesel engine at low temperature,but the effect is limited.The diesel engine starts quickly with the preheating plug,and the starting time is 3.95 s,which can effectively improve the cold start performance of diesel engine.The relative distance between the glow plug and the fuel beam is usually 0.4-2.0 mm.
Keywords：diesel enginecold start performancecompression ratiopreheating modecontrol strategythrottle opening
Publication Date：2024-02-28
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 23-29 )