公开(公告)号：US20090007545A1

公开(公告)日：2009-01-08

申请号：US11816280

申请日：2006-04-06

申请人： Kazuaki Kameda

发明人： Kazuaki Kameda

IPC分类号： F01N9/00

CPC分类号： F02D41/027 ,  B01D53/9431 ,  B01D2251/20 ,  F01N3/035 ,  F01N3/0814 ,  F01N3/0821 ,  F01N3/0842 ,  F01N3/0871 ,  F01N3/106 ,  F01N11/002 ,  F01N13/009 ,  F01N13/0097 ,  F01N2260/024 ,  F01N2510/06 ,  F01N2560/06 ,  F01N2560/08 ,  F01N2560/14 ,  F01N2610/03 ,  F01N2610/1493 ,  F01N2900/08 ,  F01N2900/1811 ,  F02D2041/0265 ,  Y02T10/47

摘要： An addition valve is provided upstream of an exhaust gas purifying catalyst (NOx catalyst) in an exhaust pipe and in the vicinity of a water jacket in a cylinder head, in addition to a fuel injection valve injecting fuel for combustion in a combustion chamber. The addition valve injects a reducing agent in an addition amount in accordance with an operation state of an engine. Using an engine coolant temperature correlated to a temperature of the addition valve, a target addition interval of the addition valve is made shorter with increase in the engine coolant temperature, so that the addition amount is increased (step 130). The temperature of the exhaust gas purifying catalyst (catalyst bed temperature) is raised as a result of increase in the addition amount. Here, a target injection amount of fuel, representing one of parameters other than the addition amount that affect the catalyst bed temperature, is restricted by using an injection amount upper limit, such that the catalyst bed temperature does not exceed an upper limit of an allowable range (steps 240, 250).

摘要翻译： 除了在燃烧室内喷射用于燃烧的燃料的燃料喷射阀之外，还在排气管中的排气管和气缸盖中的水套附近的排气净化催化剂（NOx催化剂）的上游设置加法阀。 添加阀根据发动机的运转状态，以添加量注入还原剂。 使用与加法​​阀的温度相关的发动机冷却剂温度，随着发动机冷却剂温度的增加使加法阀的目标相加间隔变短，从而增加添加量（步骤130）。 废气净化催化剂的温度（催化剂床温度）由于添加量的增加而升高。 这里，通过使用喷射量上限来限制代表影响催化剂床温度的添加量以外的参数之一的燃料目标喷射量，使得催化剂床温度不超过允许的上限 范围（步骤240,250）。