公开(公告)号：US5974785A

公开(公告)日：1999-11-02

申请号：US786387

申请日：1997-01-16

申请人： Ralph Wayne Cunningham ,  Paul Chester Gaworecki ,  Patrick Joseph Curran

发明人： Ralph Wayne Cunningham ,  Paul Chester Gaworecki ,  Patrick Joseph Curran

IPC分类号： F01N3/20 ,  F02D41/02 ,  F01N3/00

CPC分类号： F02D41/024 ,  F01N2430/06 ,  F01N3/20 ,  Y02T10/26

摘要： A method and system for reducing time required for a catalyst to reach optimum operating temperature control an air/fuel ratio based on the catalyst temperature to supply excess air to the catalyst during closed loop lambda control. A lambda bias or offset is varied as a function of the catalyst temperature, engine speed, and engine load to bias the air/fuel ratio lean of the stoichiometric ratio. Excess air may be supplied to the catalyst for a predetermined period after a cold engine start or at any time that the catalyst temperature is below its optimum operating temperature for efficient conversion. The bias or offset is reduced to zero after the catalyst reaches a desired operating temperature or the predetermined time period expires.

摘要翻译： 一种用于减少催化剂达到最佳操作温度所需时间的方法和系统，其基于催化剂温度控制空气/燃料比，以在闭环λ控制期间向催化剂供应过量的空气。 λ偏移或偏移作为催化剂温度，发动机转速和发动机负荷的函数而变化，以偏置化学计量比的空气/燃料比。 在发动机冷起动之后，或者在催化剂温度低于其最佳工作温度以便有效转化的任何时间，可以向催化剂供给过多的空气至预定的时间。 在催化剂达到所需工作温度或预定时间段到期后，偏压或偏移量减小到零。

公开(公告)号：US06523341B1

公开(公告)日：2003-02-25

申请号：US09479172

申请日：2000-01-07

申请人： Todd Anthony Rumpsa ,  Paul Chester Gaworecki

发明人： Todd Anthony Rumpsa ,  Paul Chester Gaworecki

IPC分类号： F01N300

CPC分类号： F02D41/1441 ,  F01N11/007 ,  F01N2550/02 ,  F02D41/0255 ,  F02D41/064 ,  F02D41/22 ,  F02D2200/0804 ,  F02D2200/0816 ,  Y02T10/26 ,  Y02T10/47

摘要： Method and apparatus for monitoring a catalytic converter (32) during engine (catalyst) warm-up by first and second heated exhaust gas oxygen sensors (60, 70) located upstream and downstream, respectively, of the catalytic converter. A microprocessor determines a change of signal output of the downstream sensor relative to signal output of the upstream sensor during engine (catalyst) warm-up initiated by engine cold starting during the catalyst warm-up period. A catalyst light-off temperature is determined by the microprocessor when the change occurs. The catalyst light-off temperature thus determined is compared to a stored reference catalyst light-off temperature that is indicative of a properly functioning (e.g. fresh) catalyst to assess the extent or degree of degradation of the catalyst.

摘要翻译： 在催化转化器的上游和下游位于第一和第二加热废气氧传感器（60,70）的发动机（催化剂）预热期间监测催化转化器（32）的方法和装置。 在催化剂预热期间由发动机冷起动引发的发动机（催化剂）预热期间，微处理器确定下游传感器相对于上游传感器的信号输出的变化。 当发生变化时，微处理器确定催化剂熄灭温度。 将如此测定的催化剂关闭温度与指示适当功能（例如新鲜）催化剂的存储的参考催化剂起燃温度进行比较，以评估催化剂的降解程度或程度。