Oxygen sensor aging diagnosing method

A technology of oxygen sensor and diagnostic method, which is applied to the diagnostic devices of exhaust gas treatment devices, machines/engines, exhaust gas treatment, etc. It can solve problems such as slow signal response and signal offset, and achieve fast detection speed and accurate conclusions Effect
CN102116191AInactive Publication Date: 2011-07-06FAW GROUP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
FAW GROUP
Publication Date
2011-07-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to an oxygen sensor aging diagnosing method. The method is characterized by comprising the following steps of: judging conditions; systematically recording the response time and the converting frequency of thin-to-thick oxygen and thick-to-thin oxygen respectively according to the voltage update state of an oxygen sensor after the conditions are accorded; computing the total response time and the total overturn frequency of the thin-to-thick oxygen and the thick-to-thin oxygen respectively after acquisition; and if the average response time is overlong, determining that the response capability of an oxygen sensor signal is reduced. The response capability of the oxygen sensor is determined by a specific algorithm; if the average response time exceeds a set threshold value, the condition that the response capability of the oxygen sensor signal is reduced is determined; and the method is quick in detection speed and accurate in conclusions.
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Description

Technical field:

[0001] The invention relates to a method for diagnosing aging of an oxygen sensor, which belongs to the field of automotive electronics development. Background technique:

[0002] On July 1, 2008, the third phase of GB18352.3-2005 "light vehicle pollutant emission limits and measurement methods (China III, IV phase)" emission regulations began to be implemented, which put forward mandatory requirements for on-board diagnostic systems (OBD) , one of the contents is that the oxygen sensor must be detected and diagnosed online. According to OBD regulations I3.3.2 and I.3.3.3.3, if the oxygen sensor deteriorates and the emission exceeds the limit value specified in Table I.1 of the regulations, the OBD system warning light must be turned on and the fault information recorded.

[0003] In the gasoline engine control system, the oxygen sensor plays the role of closed-loop control; at the same time, the oxygen sensor is also responsible for the important task of d...

Claims

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