一、低负荷运行中的问题在城市的交通运输中,中、低速和怠速工况的运行时间甚多,汽车大约有30％的时间是处于怠速工作,因此,研究这种工作状态下的供油特性,寻找有效的节能措施,是一个普遍关心的问题。一般认为,汽车发动机在急速和低速运行时需要较浓的燃油混合气,其主要原因是燃烧室内存留的残余发气量增多,压缩终点的压力 First, the problem of low load operation In urban transport, medium and low speed and idle conditions of running time is very large, about 30% of the time the car is idle at work, therefore, to study the work of the state for Oil characteristics, looking for effective energy-saving measures, is a universal concern. Generally believed that the car engine in the rapid and low-speed operation requires a thick mixture of fuel, the main reason is the residual gas evolution in the combustion chamber increased, the end of compression pressure