Dew point passing identification method of a NOX sensor
An identification method and sensor technology, which are applied to machines/engines, electronic control of exhaust treatment devices, diagnostic devices of exhaust treatment devices, etc., can solve the problems of Nox sensor damage, inaccurate identification, explosion, etc. environment, avoid damage, ensure the effect of safety
Active Publication Date: 2022-05-03
DONGFENG COMML VEHICLE CO LTD
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Problems solved by technology
[0008] In view of the defects existing in the prior art, the object of the present invention is to provide a dew point identification method of the Nox sensor, which can solve the problem of inaccurate identification of the dew point of the Nox sensor in the prior art, which will cause the Nox sensor to be damaged or burst.
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[0034] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present application.
[0035] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0036] figure 1It is a flow chart of the dew point identification method of the Nox sensor in the embodiment of the present invention. Such as figure 1 As shown, on the one hand, the present invention...
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The invention relates to the technical field of engine tail gas purification treatment, in particular to a dew point identification method of a Nox sensor. The dew point identification method of this Nox sensor comprises the following steps: when the real-time wall surface temperature of the Nox sensor installation position is greater than or equal to the real-time dew point temperature, according to the real-time wall surface temperature and the real-time dew point temperature of the Nox sensor installation position, and the water vapor of the Nox sensor installation position Real-time saturation concentration and real-time actual concentration of water vapor to judge whether there is condensed water on the wall where the Nox sensor is installed. If so, the Nox sensor will not start working, if not, the Nox sensor will start working; when the real-time wall temperature is lower than the real-time dew point temperature , the Nox sensor does not start working. The present application can solve the problem that the inaccurate recognition of the dew point of the Nox sensor in the prior art will cause the damage or burst of the Nox sensor, and can reduce the probability of damage or burst of the Nox sensor caused by the wrong recognition of the dew point of the Nox sensor.
Description
technical field [0001] The invention relates to the technical field of engine tail gas purification treatment, in particular to a dew point identification method of a Nox sensor. Background technique [0002] The NOx sensor is one of the key parts of the after-treatment system. Nox sensors are installed in the current automobile exhaust after-treatment system. Whether the discharge meets the regulatory requirements is tested. The Nox sensor needs a higher temperature to work (about 780 degrees), so the Nox sensor will be heated to this temperature before the Nox concentration measurement can be started. The Nox sensor has a ceramic structure inside, and the ceramic will burst when it touches water at high temperature, so it should be avoided that there is condensation on the sensor when the Nox sensor is working. In the National IV and National V phases, emission regulations have looser requirements for the monitoring of engine exhaust in low-temperature areas, so the work...
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IPC IPC(8): F01N11/00F01N13/00
CPCF01N11/00F01N11/002F01N13/00Y02T10/40
Inventor 白桃李程欢李林郑攀张衡周杰敏陈玉俊王梅俊蒋学锋
Owner DONGFENG COMML VEHICLE CO LTD