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Fault detection method and device of wide-range oxygen sensor

An oxygen sensor and wide-area technology, which is applied in the field of wide-area oxygen sensor fault detection, can solve problems such as failure or deviation of detection results, excessive exhaust emissions, and wide-area oxygen sensor no longer sensitive.

Active Publication Date: 2015-01-14
WEICHAI POWER CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] However, with the increase of use time, the wide-area oxygen sensor may become less sensitive, resulting in faults or deviations in the detection results
Thus affecting the correct judgment of the conversion efficiency of the three-way catalytic converter, and eventually leading to excessive exhaust emissions

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  • Fault detection method and device of wide-range oxygen sensor
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Embodiment Construction

[0046] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0047] see figure 1 , which is a flow chart of the first embodiment of a wide-area oxygen sensor fault detection method provided by the present invention.

[0048] In this example, include:

[0049] S101: judging whether the theoretical value calculation condition is satisfied according to the driving state parameter value of the vehicle.

[0050] S102: If the driving state parameter value satisfies the theoretical value calculation condition, calculate the theoretical oxygen concentration value according to the current catalytic emission parameter value.

[0051] S103: Compare the theoretical oxygen concentration value with the detected actual oxygen concentration value.

[0052] S104: Give a fault alarm to the wide-area oxygen sen...

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Abstract

The invention provides a fault detection method and device of a wide-range oxygen sensor. The method comprises the following steps: judging whether a theoretical value calculation condition is met according to driving state parameters of a vehicle; if the driving state parameters meet the theoretical value calculation condition, calculating a theoretical oxygen concentration value according to a current catalytic emission parameter value; comparing the theoretical oxygen concentration value with an actual oxygen concentration value, and sending fault warning to the wide-range oxygen sensor according to a comparison result. By using the method, real-time detection and accurate judgment of a fault of the wide-range oxygen sensor can be realized, so that the problems existing in a catalysis process can be timely discovered, and the vehicle exhaust emission can be effectively controlled.

Description

technical field [0001] The invention relates to the technical field of automobile engines, in particular to a fault detection method and device for a wide-area oxygen sensor. Background technique [0002] In order to meet the increasingly stringent vehicle exhaust emission requirements, wide-area oxygen sensors are more and more widely used in engine control and exhaust gas aftertreatment. [0003] The wide-area oxygen sensor is mainly used to detect the conversion efficiency of the three-way catalytic converter. Its working principle is that the exhaust gas discharged from the engine includes harmful gases such as HC, CO, and NOx. After the exhaust gas enters the three-way catalytic converter, it undergoes a chemical reaction under the action of catalysis and converts it into carbon dioxide, water and nitrogen. While catalyzing, the oxygen in the exhaust gas is consumed and heat is generated, which makes the three-way catalytic converter heat up. The conversion efficiency...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00
CPCY02T10/40
Inventor 李栋任宪丰蔺海艳王金平臧润涛
Owner WEICHAI POWER CO LTD