公开(公告)号：US20110219861A1

公开(公告)日：2011-09-15

申请号：US13044021

申请日：2011-03-09

申请人： Ryozo KAYAMA ,  Toshihiko Tanaka ,  Masahiro Kubo

发明人： Ryozo KAYAMA ,  Toshihiko Tanaka ,  Masahiro Kubo

IPC分类号： G01M15/10

CPC分类号： F02D41/22 ,  F02D41/0007 ,  F02D41/0085 ,  Y02T10/40

摘要： When a wastegate valve, which opens and closes an exhaust bypass passage bypassing an exhaust turbine, is open, exhaust gases of respective cylinders bypass the exhaust turbine and pass a sensing point of an air-fuel ratio sensor downstream of the exhaust turbine. Accordingly, the exhaust gases of the respective cylinders can be avoided from being mixed by the exhaust turbine, so an influence of an inter-cylinder variation in an air-fuel ratio due to an inter-cylinder imbalance abnormality becomes apt to appear in an output waveform of the air-fuel ratio sensor. Therefore, existence or nonexistence of the inter-cylinder imbalance abnormality is determined based on the output of the air-fuel ratio sensor when the wastegate valve is open. Eventually, the existence or nonexistence of the inter-cylinder imbalance abnormality can be determined accurately, thereby improving detection accuracy of the inter-cylinder imbalance abnormality.

摘要翻译： 当打开和关闭旁路排气涡轮机的排气旁通通道的废气门打开时，各个气缸的废气旁路排气涡轮并将排气涡轮下游的空燃比传感器的感测点通过。 因此，可以避免各气缸的排气被排气涡轮混合，因此，由于气缸内不平衡异常引起的气缸内的变化对空燃比的影响容易出现在输出 空燃比传感器的波形。 因此，当排气门阀打开时，基于空燃比传感器的输出来确定气缸间不平衡异常的存在或不存在。 最终，可以精确地确定气缸内不平衡异常的存在或不存在，从而提高气缸间不平衡异常的检测精度。