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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

Inactive Publication Date: 2011-07-06
FAW GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to the characteristics of the oxygen sensor, the possible faults of the oxygen sensor include slow signal response, signal deviation fault (the signal of the rich mixture is not too rich, the signal of the lean mixture is too rich) and the reliability test of the oxygen sensor

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0032] like figure 1 As shown, when the real vehicle is 50kph, it is detected that the oxygen sensor responds to the diagnostic deterioration and reports a fault, and the detection is carried out by the following methods:

[0033] (1) Diagnostic entry condition judgment

[0034] The diagnosis of slow signal response should meet the following preconditions: A. The duration of engine operation exceeds the minimum engine operation time of 60s; ), atmospheric pressure (over 80kpa) and coolant temperature (over 70°C) are within the allowable range; C. The fuel is in a closed-loop control state; D. If the system has the function of fuel cut-off and enrichment control, it is required that the fuel control is not in the state after fuel cut-off Enriched state; E. If the system has the carbon tank control function, the carbon tank desorption rate is within the allowable range of the carbon tank desorption rate; F. If the system has the torque reduction function, the fuel control is no...

Embodiment 2

[0056] figure 2 In order to detect the deterioration of the oxygen sensor and report a fault when decelerating and cutting off the fuel, the method of the present invention is adopted to obtain the following results:

[0057] The oxygen sensor has been tested 21 times in total (not exceeding the test limit of 30 times), and the number of failures is 20 times, which has exceeded the failure limit. After the test is completed, it will report a failure of deceleration and fuel cut-off.

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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.

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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Application Information

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IPC IPC(8): F01N11/00F02D43/00
CPCY02T10/47Y02T10/40
Inventor 孙鹏远颜松
Owner FAW GROUP
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