Title:
ABNORMALITY DETERMINATION DEVICE FOR AIR-FUEL RATIO SENSOR
Document Type and Number:
Japanese Patent JP2017210874
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To early determine sensor element crack abnormality of an air-fuel ratio sensor with high accuracy.SOLUTION: An abnormality determination device for the air-fuel ratio sensor includes a valve for opening/closing an atmosphere introduction part so that an atmosphere chamber is set either into an open-to-the-atmosphere state that the atmosphere is introduced into the atmosphere chamber, or into a closed state that the introduction of the atmosphere into the atmosphere chamber is shut off, and a pressure sensor for detecting a pressure in the atmosphere chamber. It determines whether a pressure Ps detected by the pressure sensor is lower than a predetermined threshold pressure Pth or not in the state that the atmosphere introduction part is closed by the valve to set the atmosphere chamber into the closed state and a sensor element is heated by a heater, and determines that the air-fuel ratio sensor is in the state of element crack abnormality when the detected pressure Ps is lower than the threshold pressure Pth.SELECTED DRAWING: Figure 4
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Inventors:
NISHIURA TORU
Application Number:
JP2016102250A
Publication Date:
November 30, 2017
Filing Date:
May 23, 2016
Export Citation:
Assignee:
TOYOTA MOTOR CORP
International Classes:
F02D45/00; G01N27/409
Attorney, Agent or Firm:
Patent business corporation Prospec patent office
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