Method and system for detecting fault of rear oxygen sensor

a rear oxygen sensor and fault technology, applied in the direction of machines/engines, electrical control, instruments, etc., can solve the problems of not considering the state of the engine, load pulse methods cannot deal with various regulations, etc., and achieve the effect of reducing power and power duty

US20160032812A1Inactive Publication Date: 2016-02-04HYUNDAI MOTOR CO LTD
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
Publication Date
2016-02-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method for detecting a fault of a rear oxygen sensor installed on an exhaust pipe of a vehicle may include determining whether the rear oxygen sensor satisfies a diagnosis entry condition, comparing an output voltage of the rear oxygen sensor to a preset fault determination voltage range so as to determine whether the output voltage of the rear oxygen sensor is included in the fault determination voltage range, changing the duty of a heater of the rear oxygen sensor when the output voltage of the rear oxygen sensor is not included in the fault determination voltage range, determining whether the output voltage of the rear oxygen sensor, controlled by changing the heater duty, is included in the fault determination voltage range, and confirming that the rear oxygen sensor has a fault, when the output voltage of the rear oxygen sensor is included in the fault determination voltage range.
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Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims priority to Korean Patent Application No. 10-2014-0099170, filed on Aug. 1, 2014, the entire disclosure of which is hereby incorporated by reference herein.BACKGROUND

[0002] 1. Field of the Disclosure

[0003] The present disclosure relates to a method and system for detecting a fault of a rear oxygen sensor which is installed on an exhaust pipe of a vehicle; and, particularly, to a method and system for detecting a fault of a rear oxygen sensor which monitors an output voltage of the rear oxygen sensor in a state where power of a heater to activate the rear oxygen sensor is cut off for a predetermined time, and detect a fault of the rear oxygen sensor.

[0004] 2. Description of Related Art

[0005] In general, a vehicle measures the concentration of oxygen contained in exhaust gas discharged from an engine using an oxygen sensor, and determines the state of the exhaust gas. Then, the vehicle controls combustion to reduce exhaus...

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Embodiment Construction

[0037]Exemplary embodiments of the present disclosure will be described below in more detail with reference to the accompanying drawings. The present disclosure may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. Throughout the disclosure, like reference numerals refer to like parts throughout the various figures and embodiments of the present disclosure.

[0038]Hereafter, a method for detecting a fault of a rear oxygen sensor in accordance with an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings.

[0039]An embodiment of the present disclosure provides a method for detecting a fault of a rear oxygen sensor, which is installed at the rear of a catalytic converter on an exhaust pipe o...