A three-way catalytic converter fault detection method and device
A three-way catalytic converter and fault detection technology, which is applied to the electronic control of exhaust treatment devices, diagnostic devices for exhaust treatment devices, engine components, etc., can solve the impact of automobile operation, time-consuming, three-way catalytic converter fault detection Complicated issues
Active Publication Date: 2020-06-26
WEICHAI POWER CO LTD
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Problems solved by technology
[0003] If the three-way catalyst fails, it will have a great impact on the operation of the car
Some detection methods for three-way catalyst failures in the prior art generally require additional equipment assistance, and the detection of three-way catalyst failures is more complicated and time-consuming
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[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0042] refer to figure 1 , which shows a schematic flowchart of a three-way catalytic converter fault detection method provided by an embodiment of the present invention. In this embodiment, the method includes:
[0043] S101: When the current detection environment satisfies the preset efficiency conversion condition, determine the target excess air ratio upstream of the three-way catalytic converter;
[0044] In this embodiment, the excess air coefficient is...
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The invention discloses a method and device for detecting faults of a three-way catalytic converter. The method comprises the steps of determining a target excess air coefficient upstream of the three-way catalytic converter under the conditions that the current detection environment satisfies the preset efficiency conversion conditions, then obtaining the maximum voltage value of each fluctuationperiod in preset time, and calculating the voltage average value of all the maximum voltage values; if the voltage average value is greater than the preset first threshold value, indicating that thefluctuation amplitude of the voltage downstream of the three-way catalytic converter exceeds the normal range, that is, a problem occurs in the conversion efficiency of the three-way catalytic converter, and the three-way catalytic converter has a failure. In this way, fast on-line fault detection of the three-way catalytic converter is achieved without adding any external device.
Description
technical field [0001] The invention relates to the field of fault diagnosis, in particular to a three-way catalytic converter fault method and device. Background technique [0002] The three-way catalytic converter is the most important external purification device installed in the automobile exhaust system. The three-way catalytic converter can remove CO, HC and NO from the exhaust gas of the automobile. X Harmful gases such as carbon dioxide, water and nitrogen are converted into harmless carbon dioxide, water and nitrogen through oxidation and reduction. [0003] If the three-way catalyst fails, it will have a great impact on the operation of the car. Some detection methods for three-way catalyst failures in the prior art generally require additional equipment assistance, and the detection of three-way catalyst failures is relatively complicated and time-consuming. Contents of the invention [0004] In view of this, the embodiments of the present invention provide a ...
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Login to View More IPC IPC(8): F01N11/00
CPCF01N11/00F01N11/007Y02T10/40
Inventor 闫立冰吴速超张娟张雷波
Owner WEICHAI POWER CO LTD