Optimization of Cold Start Performance of Diesel Engine Under Low Temperature and High Altitude Environment 2024-01-2455

The problem of keeping the stable starting performance of diesel engine under high altitude and low temperature conditions has been done a lot of research in the field of diesel engine, but there is a lack of research on extreme conditions such as above 2000 meters above sea level and below 0°C. Aiming at solving the cold start problem of diesel engine in extreme environment, a set of chamber system of cold start environment diesel engine was constructed to simulate environment of 3000m altitude and -20°C. A series of experimental research was conducted on cold start efficiency optimization strategy of a certain type of diesel engine at 3000m altitude and -20°C. In parallel, a diesel engine model was constructed through Chemkin to explore the influence of the three parameters of compression ratio, stroke length, and fuel injection advance angle on the first cold start cycle of diesel engine at 4000m altitude and -20°C. The simulation results show that in altitude 4000m and -20°C conditions, increasing the compression ratio, stroke length and appropriately reducing the fuel injection advance angle can shorten the ignition delay period of the first cycle of the diesel engine, and improve the peak cylinder pressure and heat release rate peak. Experimental results show that in altitude 3000m and -20°C conditions, increasing compression ratio, stroke length, starting torque, and properly adjusting diesel engine fuel injection advance angle can improve diesel engine cold start performance to various degrees.