Three-way catalyst ageing detection method and device

Abstract

The invention provides a three-way catalyst ageing detection method and device applied to the technical field of engines. The method includes the steps that after an engine retreats the reverse towing working condition, a preset parameter influencing the bed temperature of a three-way catalyst is obtained; if the obtained preset parameter is within the preset range, the oxygen storage amount of the three-way catalyst is calculated; the size relation between the obtained oxygen storage amount and the preset oxygen storage amount threshold value is further obtained through comparison; and if the calculated oxygen storage amount is smaller than the preset oxygen storage amount threshold value, it is judged that the three-way catalyst ages. According to the three-way catalyst ageing detection method and device, the oxygen storage amount in the normal work state of the three-way catalyst is obtained, ageing detection is conducted with the oxygen storage amount as the judgment reference, the whole detection process can be completed under the condition that the actual work state of the three-way catalyst is not influenced, and therefore it is avoided that the overall processing effect of vehicle tail gas is influenced.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to a three-way catalytic converter aging detection method and device. Background technique [0002] The three-way catalytic converter (Three-Way-Catalyst) can convert harmful gases such as CO, HC and NOx emitted from automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction. As an important external purification device, if the three-way catalytic converter is aging, it will seriously affect the treatment effect of automobile exhaust, making the vehicle unable to meet the increasingly stringent emission regulations. [0003] In view of the important role of the three-way catalytic converter in practical applications, how to detect the aging state of the three-way catalytic converter and replace the aged three-way catalytic converter in time has become a technical problem to be solved urgently by those skilled in the art. Content...

AI Technical Summary

Problems solved by technology

[0002] The three-way catalytic converter (Three-Way-Catalyst) can convert harmful gases such as CO, HC and NOx emitted from automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction. As an important external purification device, if the three-way catalytic converter is aging, it will seriously affect the treatment effect of automobile exhaust, resulting in the vehicle being unable to meet the increasingly stringent emission regulations.

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