具有内部egr系统的发动机

Engine with internal EGR system

Abstract

本发明提出了一种具有内部EGR的发动机,该发动机配备有变几何涡轮增压器和颗粒过滤器,其中,根据由于在颗粒过滤器中的颗粒物质的沉积作用导致的内部EGR率的变化,可以利用简单的装置并准确地控制变几何涡轮增压器的喷嘴角(喷嘴面积)。并且在发动机的整个操作范围内可以获得降低NOx排放的EGR效应,而没有减少发动机的使用寿命。
An engine with EGR system equipped with a variable geometry turbocharger and a particulate filter is provided in which the nozzle angle (nozzle area) of the variable geometry turbocharger can be controlled accurately and by a simple means in accordance with the change in the internal EGR rate due to deposition of particulate matter in the particulate filter, and the effect of EGR to reduce NOx emission is obtained in the whole operation range of the engine without deteriorating durability of the engine.

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