公开(公告)号：US5564283A

公开(公告)日：1996-10-15

申请号：US314641

申请日：1994-09-29

申请人： Toru Yano ,  Hidehito Ikebe ,  Kazuhide Terada

发明人： Toru Yano ,  Hidehito Ikebe ,  Kazuhide Terada

IPC分类号： F02B1/04 ,  F02D21/08 ,  F02D41/00 ,  F02D41/02 ,  F02D41/14 ,  F02D43/00 ,  F02M11/10 ,  F02M25/07 ,  F02P5/15 ,  F02M25/06

CPC分类号： F02D41/0065 ,  F02D41/146 ,  F02P5/1516 ,  F02B1/04 ,  F02D2200/0802 ,  Y02T10/46 ,  Y02T10/47

摘要： In an exhaust emission control system in an internal combustion engine which includes a spark plug disposed to face a combustion chamber, an intake system having a fuel injection valve disposed therein, an exhaust system having a catalytic converter incorporated therein and filled with a catalyst for reducing nitrogen oxide (NO.sub.x) in the presence of hydrocarbons in an oxidizing atmosphere, and an exhaust gas circulation amount control means capable of measuring and controlling the amount of exhaust gas circulated from the exhaust system to the intake system. The amount of exhaust gas circulated by the exhaust gas circulation amount control means the amount and timing of fuel injected by the fuel injection valve and the timing of ignition of the spark plug are controlled by a control unit, so that the amount of NO.sub.x discharged, is detected by the NO.sub.x detector in the exhaust system at a location downstream from the catalytic converter, is equal to or less than an acceptable amount of NO.sub.x discharged which acceptable amount is set in accordance with the number of revolutions of the engine detected by a revolution-number detector as well as the engine load detected by a load detector. Thus, it is possible to control the concentration and type of hydrocarbons and the temperature of the catalyst to increase the elimination rate of NO.sub.x.

摘要翻译： 在内燃机的废气排放控制系统中，其包括设置成面对燃烧室的火花塞，具有设置在其中的燃料喷射阀的进气系统，具有并入其中的催化转化器的排气系统，并填充有用于还原的催化剂 在氧化性气氛中的烃存在下的氮氧化物（NOx）和能够测量和控制从排气系统循环到进气系统的废气量的废气循环量控制装置。 由废气循环量控制装置循环的废气量由燃料喷射阀喷射的燃料的量和时间以及火花塞的点火时间由控制单元控制，从而排出的NOx量， 由排气系统中的NOx检测器在催化转化器下游的位置检测到，等于或小于根据由转速检测到的发动机的转数设定可接受量的NOx排放的可接受量 - 检测器以及由负载检测器检测到的发动机负载。 因此，可以控制烃的浓度和类型以及催化剂的温度来提高NOx的消除速率。