The excellent torque and performance behavior combined with low fuel consumption and exhaust emissions of modern diesel engines which equipped with high pressure common rail system has increased their market day by day. But the combustion instability and white smoke emissions are serious problems during cold starting and the transient emissions during the engine start-up process were still high for ultra low emission control. In this investigation, start control strategies and experiments were designed to improve the start performance. The research was carried out on a 4-cylinder 2.5 L turbocharged diesel engine equipped with BOSCH common rail system, which the Electronic Control Unit was self-developed based on the high performance microcontroller SPC563M64, so the control strategies and parameters could be verified expediently. The initiation of diesel fuel combustion is dependent on the compression temperature, compression pressure, fuel properties and fuel injection characteristic, so the start-up process was divided into four modules, and the main and pilot injection quality, injection phase, rail pressure control style and the target pressure control value were optimized respectively according to the characteristics of the four stages, so the controlling could be more accurate. The injection quality and phase is corrected according to the engine temperature and intake air temperature. It was found that the injection parameters of the injection phase and quality of the start accelerate module have large effects on the start-up time and smoke emission, with proper pilot injection quality and main injection phase, the starting time and smoke were reduced, and the starting performance was improved dramatically on the test engine.


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