Analysis of Cold Start Combustion in a Direct Injection Diesel Engine

Fuel injection timing retardation for reducing exhaust emission of direct injection diesel engines prolongs the period to complete cold starting. Engine speed at this period varies through some accelerating and faltering stages.

The speed variation and relating combustion characteristics was investigated through the measurement of cylinder pressure for each cylinder as well as the dynamic fuel injection timing and instantaneous engine speed.

An improvement of cold start was shown by application of afterheat of a sheathed type glow plug and an electronic fuel injection timing control device.