公开(公告)号：US06782695B2

公开(公告)日：2004-08-31

申请号：US10264642

申请日：2002-10-04

申请人： Phillippe Paul Robert Lutz ,  Garon Nigel Heslop ,  Darren Montgomery ,  Jon Dixon

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

IPC分类号： F01N300

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燃料控制器所要求的空燃比以保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，用于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，其中控制器被配置为执行以下步骤：a）当切换时请求空气与燃料的最大比率 值小于第一阈值; b）从所述最大比率逐渐减小所请求的空气燃料比; c）当所述开关值大于第二阈值时请求空气与燃料的最小比率; andd）从所述最小比例逐渐增加所请求的空燃比。