A method and device for detecting clogging of a three-way catalytic converter
A three-way catalytic converter and detection result technology, which is applied to the electronic control of exhaust treatment devices, diagnostic devices for exhaust treatment devices, engine components, etc., can solve the problem that the three-way catalytic converter cannot be judged in real time whether it is clogged or aging , to avoid potential safety hazards
Active Publication Date: 2018-04-03
WEICHAI POWER CO LTD
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[0006] Due to the current problem that it is impossible to judge whether the three-way catalytic converter is clogged or aging in real time online, it is necessary to go to the service station to judge with the help of a diagnostic instrument. This invention proposes a method and device for detecting the clogging of the three-way catalytic converter
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[0035] The specific embodiments of the invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0036] figure 1 A schematic flow chart of a method for detecting clogging of a three-way catalytic converter provided in this embodiment is shown, including:
[0037] S1. When the exhaust gas flow rate in the exhaust pipe is greater than zero, calculate the pressure difference between the front and rear ends of the three-way catalytic converter according to the mass flow rate of the exhaust gas, the temperature at the front end of the three-way catalytic converter and the pressure at the front end of the three-way catalytic converter;
[0038] S2. When the pressure difference is greater than the pressure difference threshold and the number of times the pressure difference is...
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The invention discloses a method for detecting blocking of a three-way catalyst. The method comprises the steps of when the exhaust gas flow in an exhaust pipe is larger than zero, carrying out calculation to obtain the differential pressure of the front end and the back end of the three-way catalyst according to the exhaust gas mass flow, the temperature of the front end of the three-way catalyst and the pressure of the front end of the three-way catalyst; when the differential pressure is larger than the differential pressure threshold value and the time of the situation that the differential pressure is larger than the differential pressure threshold value is larger than the preset time, determining that the detection result is that the three-way catalyst is blocked; and if not, setting that the pressure of the front end of the three-way catalyst is the sum of the current pressure of the back end of the three-way catalyst and the differential pressure, and judging whether the exhaust gas flow in the exhaust pipe is larger than zero or not. According to the method, through calculating the differential pressure of the front end and the back end of the three-way catalyst, whether the three-way catalyst is blocked or not is judged, whether the three-way catalyst is blocked or aged can be effectively distinguished, and the potential safety hazard of an engine is avoided.
Description
technical field [0001] The invention relates to the field of detection of three-way catalytic converters, in particular to a method and device for detecting clogging of three-way catalytic converters. Background technique [0002] The three-way catalytic converter is the most important external purification device installed in the automobile exhaust system. It 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. . Among them, CO means carbon monoxide, one of the main harmful emissions of gas engines; NOx is the collective name of nitrogen monoxide and nitrogen dioxide, one of the main harmful emissions of gas engines, and is strictly controlled by emission regulations; HC means hydrocarbons, the gas engine One of the main harmful emissions. Oxygen sensor is a standard configuration on automobiles. It uses ceramic sensitive components to measure the oxygen potential...
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IPC IPC(8): F01N11/00
CPCF01N11/002F01N11/007F01N2900/0416F01N2900/1402F01N2900/1404F01N2900/1406Y02T10/40
Inventor 闫立冰任宪丰刘兴义张雷波
Owner WEICHAI POWER CO LTD