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1 前言设法使柴油机达到较低NO_x排放水平一直困扰着发动机设计师,他们既要寻求先进的排放指标,又要满足客户期望的性能。非道路动力装置制造商考虑的一种方法是采用空-空增压空气冷却。对于许多制造商而言,空-空增压空气冷却是备用方案。它能使发动机满足排放法规和通过扭矩储备改善运转性能,还能保持良好的燃油经济性,所以原则上值得提倡。但也有不少人认为,如
1 INTRODUCTION Trying to reach a lower NOx emission level for diesel engines has plagued engine designers who seek not only advanced emission targets but also the performance they expect from their customers. One method considered by manufacturers of off-road power plants is to use air-to-air charge air cooling. For many manufacturers, air-to-air charge air cooling is a backup solution. It can make the engine meet the emission regulations and improve operating performance through torque reserve, but also maintain good fuel economy, so in principle worth promoting. But there are many people think, such as