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Patent Searching and Data


Title:
ABNORMALITY DIAGNOSIS DEVICE FOR AIR-FUEL RATIO SENSOR
Document Type and Number:
Japanese Patent JP2009228601
Kind Code:
A
Abstract:

To improve accuracy in the abnormality diagnosis of an air-fuel ratio sensor in an engine provided with a turbocharger.

A waste gate valve 11 is fully opened during abnormality determination. The majority of exhaust gas flows into a bypass passage 10 caused by the fluid resistance of a turbine 3a. Since the air-fuel ratio sensor 12 is disposed in the exhaust gas passage 5 at a downstream of a merging point of a downstream side of the turbine 3a and the bypass passage 10, the sensor detects mainly exhaust gas from the bypass passage 10. An element receiving influence of turbine speed out of exhaust gas detected by the air-fuel ratio sensor 12 can be reduced.


Inventors:
DEMURA TAKAYUKI
Application Number:
JP2008076371A
Publication Date:
October 08, 2009
Filing Date:
March 24, 2008
Export Citation:
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Assignee:
TOYOTA MOTOR CORP
International Classes:
F02D45/00; F02D43/00
Attorney, Agent or Firm:
Yoshikazu Tani
Kazuo Abe