公开(公告)号：EP1300571A1

公开(公告)日：2003-04-09

申请号：EP01308485.0

申请日：2001-10-04

申请人： Visteon Global Technologies, Inc.

发明人： Lutz, Philippe Paul, Robert ,  Heslop, Garon Nigel ,  Montgomery, Darren ,  Dixon, Jon

IPC分类号： F02D41/02 ,  F02D41/14 ,  F01N11/00

CPC分类号： F02D41/0295 ,  F01N11/007 ,  F01N2550/02 ,  F02D41/14 ,  F02D41/1454 ,  F02D2041/1433 ,  Y02T10/47

摘要： This invention relates to a method and apparatus for controlling the air-fuel ratio demanded by a fuel controller in order to maintain optimum performance of a catalytic converter. The invention provides a controller for requesting an air fuel ratio according to a switching value derived from an estimated oxygen storage value of a catalyst, in which the controller is arranged to perform the following steps

a) request a maximum ratio of air to fuel when the switching value is less than a first threshold;
b) gradually decrease the requested air to fuel ratio from said maximum ratio;
c) request a minimum ratio of air to fuel when the switching value is greater than a second threshold; and
d) gradually increase the requested air to fuel ratio from said minimum ratio.

摘要翻译： 本发明涉及一种用于控制由燃料控制器要求的空燃比以维持催化转化器的最佳性能的方法和装置。 本发明提供了一种控制器，其根据从催化剂的估计氧气储存值得到的开关值来请求空燃比，其中控制器被布置成执行以下步骤：a）当空气燃料的最大比例 开关值小于第一阈值; b）从所述最大比率逐渐减少所要求的空燃比; c）当切换值大于第二阈值时请求空气与燃料的最小比率; 和d）从所述最小比率逐渐增加所要求的空气/燃料比。