公开(公告)号：US5956941A

公开(公告)日：1999-09-28

申请号：US731421

申请日：1996-10-15

申请人： Michael John Cullen ,  Robert Sarow Baskins ,  Ziad Zaghati ,  Christopher K. Davey ,  David R. Nader

发明人： Michael John Cullen ,  Robert Sarow Baskins ,  Ziad Zaghati ,  Christopher K. Davey ,  David R. Nader

IPC分类号： F02D45/00 ,  B01D53/94 ,  F01N3/05 ,  F01N3/08 ,  F01N3/20 ,  F01N3/24 ,  F01N9/00 ,  F01N11/00 ,  F01N13/02 ,  F02D41/14 ,  F02M25/07 ,  G01M15/11

CPC分类号： F01N9/005 ,  B01D53/9495 ,  F01N11/00 ,  F01N11/005 ,  F01N11/007 ,  F01N13/009 ,  F01N3/05 ,  F01N3/0842 ,  F01N3/0871 ,  F01N3/2006 ,  F01N9/00 ,  F02D41/1401 ,  F02D41/1402 ,  F02D41/1408 ,  F02D41/1441 ,  F02D41/1446 ,  F02D41/1498 ,  G01M15/11 ,  F01N2250/12 ,  F01N2410/00 ,  F01N2550/02 ,  F01N2570/12 ,  F01N2570/14 ,  F02D2041/1433 ,  F02D2200/0804 ,  F02D2200/1015 ,  F02D41/0047 ,  Y02T10/26 ,  Y02T10/47

摘要： A method and system for estimating the midbed temperature of a catalytic converter in an exhaust system of an internal combustion engine. A rate of change in the speed of the engine is sensed and an estimated number of misfires occurring in the engine over a predetermined number of cylinder filling events is determined based on the sensed rate of change in engine speed. An instantaneous temperature of exhaust gas at the exhaust flange is determined based on the estimated rate of misfires. An instantaneous temperature at the midbed point of the catalytic converter is then determined based on the instantaneous temperature of exhaust gas at the exhaust flange. The instantaneous temperature at the midbed point is compared to a predetermined temperature threshold and the estimate rate of misfires is compared to a predetermined misfire rate threshold. A malfunction signal is then generated if both the instantaneous temperature at the midbed point exceeds the predetermined temperature threshold and the estimated rate of misfires exceeds the predetermined misfire rate threshold. A method for monitoring catalyst degradation is also disclosed.

摘要翻译： 一种用于估计内燃机的排气系统中的催化转化器的中间温度的方法和系统。 感测到发动机速度的变化率，并且基于感测到的发动机速度变化率来确定在预定数量的气缸充填事件中在发动机中发生的预计的火灾数量。 基于估计的失火率来确定排气凸缘处的废气的瞬时温度。 然后基于排气法兰上的废气的瞬时温度来确定催化转化器中点处的瞬时温度。 将中点处的瞬时温度与预定温度阈值进行比较，并将误火的估计率与预定失火速率阈值进行比较。 如果中点处的瞬时温度都超过预定温度阈值，并且估计的失火速率超过预定失火速率阈值，则产生故障信号。 还公开了一种用于监测催化剂降解的方法。

公开(公告)号：US06804951B2

公开(公告)日：2004-10-19

申请号：US10065648

申请日：2002-11-06

申请人： David Robert Nader ,  Michael Igor Kluzner ,  Robert Eloy Gonzales ,  Robert Joseph Jerger ,  Ziad Zaghati

发明人： David Robert Nader ,  Michael Igor Kluzner ,  Robert Eloy Gonzales ,  Robert Joseph Jerger ,  Ziad Zaghati

IPC分类号： F01N300

CPC分类号： F02D41/1441 ,  F01N3/20 ,  F01N11/007 ,  F02D41/0235 ,  F02D41/1456 ,  F02D41/221 ,  F02D2041/228 ,  Y02T10/47

摘要： A method for determining the effectiveness of a catalyst to remove emissions from the exhaust of an internal combustion engine. The method includes measuring an upstream time history of a signal produced by an exhaust gas oxygen sensor upstream of the converter and a time history of an exhaust gas oxygen sensor disposed downstream of the converter. The time histories vary between a lean air-fuel ratio signal level and a rich air-fuel ratio signal level. A time delay is determined between the upstream time history and the downstream time history during transitions in such time histories from the lean air-fuel ratio signal level to the rich air-fuel ratio signal level. The determined time delay is compared with a reference time delay to determine the efficiency of the converter. The converter is determined to be ineffective if the converter as been determined to be potentially ineffective and the time delay is determined to be less than the reference time delay.

摘要翻译： 一种用于确定催化剂去除内燃机排气排放的有效性的方法。 该方法包括测量由转换器上游的废气氧传感器产生的信号的上游时间历史，以及设置在转换器下游的排气氧传感器的时间历程。 时间历程在贫空燃比信号电平和浓空燃比信号电平之间变化。 在这样的时间历程中从稀空燃比信号电平到浓空燃比信号电平的转变期间的上游时间历史和下游时间历史之间确定时间延迟。 将确定的时间延迟与参考时间延迟进行比较以确定转换器的效率。 如果转换器被确定为潜在地无效且时间延迟被确定为小于参考时间延迟，则转换器被确定为无效。