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柴油机具有良好的动力性和经济性,已被广泛应用于工农业及运输业,然而随着排放法规的日益严格,降低柴油机的排放成为柴油机排放控制技术研究的热点问题[1-4]。为了降低柴油机的排放,首先燃油喷射系统的改进是关键环节,电控高压共轨喷射是兴起的一种新型燃油喷射系统,柴油机采用该系统时通过最佳喷油定时、最佳喷油率、预喷射和多级喷射,在降低排放方面十分有效[2,4]。另一方面,柴油机通过增压可使进气量增大,
Diesel engine with good power and economy has been widely used in industry, agriculture and transportation industry. However, with the increasingly stringent emission regulations, reducing diesel engine emissions has become a hot issue in diesel engine emission control technology [1-4]. In order to reduce the emission of diesel engine, the improvement of the fuel injection system is the key step at first. The electronic control high-pressure common rail injection is a new type of fuel injection system. The diesel engine adopts this system by the best injection timing, Pre-injection and multistage injection are very effective in reducing emissions [2,4]. On the other hand, diesel engine can increase the intake air pressure,