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Fault diagnosis method for three-way catalytic converter of automobile

A catalytic converter and fault diagnosis technology, which is applied to the diagnostic devices of exhaust treatment devices, engine components, machines/engines, etc., can solve the problem of high cost and achieve the effect of effective cost

Inactive Publication Date: 2010-09-15
北京锐意泰克汽车电子有限公司
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Problems solved by technology

However, it is impractical to directly use the exhaust gas analysis device on the car to detect the conversion efficiency of the three-way catalytic converter, and even if it can be done, the cost is quite high

Method used

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Embodiment Construction

[0016] The fault diagnosis method of the automobile three-way catalytic converter that the present invention proposes, its flow chart is as follows figure 1 shown, including the following steps:

[0017] (1) collect the voltage signal of the oxygen sensor downstream of the three-way catalytic converter in the automobile with a certain period;

[0018] (2) Calculate the average value N of the voltage signal of the downstream oxygen sensor collected above within a period of time, as a reference for calculating the volatility of the voltage signal of the downstream oxygen sensor.

[0019] (3) collecting the voltage signal of the current downstream oxygen sensor, and calculating the deviation between the current voltage signal and the above-mentioned average value N;

[0020] (4) Calculate the deviation between the current voltage signal and the above-mentioned average value N within a period of time, and calculate the average value M of the absolute value of all deviations, as t...

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Abstract

The invention relates to a fault diagnosis method for a three-way catalytic converter of an automobile, and belongs to the technical field of automotive electronics. The method comprises the following steps of: acquiring voltage signals of an oxygen sensor in the downstream of the three-way catalytic converter in the automobile; calculating an average value N of the voltage signals in a certain period of time; calculating the difference between the current voltage signal and the average value N; calculating the difference between the current voltage signal and the average value N in a certain period of time, and calculating an average value M of absolute values of all differences; multiplying M by a coefficient K which is related to engine speed and load, and using the calculated result as an amplitude Z of the downstream oxygen sensor; respectively calculating an average value P of amplitudes of the downstream oxygen sensor in a certain period of time; and setting an amplitude threshold of the downstream oxygen sensor, and comparing P with the threshold to determine the fault condition of the three-way catalytic converter. The conversion efficiency of the three-way catalytic converter can be effectively detected by the method of the invention instead of an exhaust gas analysis device which is directly used on the automobile; and the method has the advantages of simpleness, effectiveness and low cost.

Description

technical field [0001] The invention relates to a fault diagnosis method for an automobile three-way catalytic converter, belonging to the technical field of automobile electronics. Background technique [0002] Nowadays, most automobiles install a three-way catalytic converter in the engine exhaust system to make the HC, CO, and NOx in the exhaust undergo redox reactions, so as to purify the exhaust gas and reduce pollution. Correspondingly, the engine control unit needs to have the monitoring function of the three-way catalytic converter, so as to detect the failure of the three-way catalytic converter in time, so as to ensure that the three-way catalytic converter always has a high purification efficiency. [0003] From the air-fuel ratio characteristics of the three-way catalytic converter, it can be seen that only within a narrow range near the theoretical air-fuel ratio, the three-way catalytic converter can achieve the highest purification efficiency for the three har...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00F01N3/20
CPCY02T10/47Y02A50/20Y02T10/12Y02T10/40
Inventor 赵磊任学礼龙帆赵小娜
Owner 北京锐意泰克汽车电子有限公司
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