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叙述一种用喷油率形状控制技术提供高柔性燃油喷射装置(FIE)的构思、设计和性能。这种喷油系统能在整个速度和负荷范围内,实现标准的和靴形喷油率以及预喷射和后喷射。着重强调了用压力控制阀而不是用节流的方法来实现靴形喷油率形状(即:在整个喷油期间,针阀是全开的,不用节流装置限制喷油嘴前面的燃油流减小喷油率)。在排量为2L的单缸试验机上做了一个工况(1000r/min,200mm~3/次=全负荷油量的75%)的初步发动机试验。把靴形和预喷射的喷油率控制技术与无喷油率控制的标准喷射进行了比较。在烟度和燃油消耗率不变的情况下,靴形喷射显示了极大的改进潜力。
Describe the concept, design, and performance of a highly flexible fuel injection device (FIE) that uses injection rate shape control technology. This injection system enables standard and shoe-shaped fuel injection rates as well as pre-injection and post-injection over the entire speed and load range. Emphasis is placed on the use of pressure-controlled valves rather than throttling to achieve a shoe shape (ie, the needle valve is fully open during the entire injection, without the throttle limiting the fuel flow in front of the nozzle Reduce fuel injection rate). A single cylinder test machine with a displacement of 2 L was used for a preliminary engine test at 1000 rpm, 200 mm 3 / time = 75% of full load. The shoe and pre-injection fuel injection rate control technology was compared to a standard injection without fuel injection rate control. Boot jet shows tremendous potential for improvement with consistent smoke and fuel consumption.