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SCR system downstream temperature sensor credibility fault diagnosis method

A temperature sensor and SCR system technology, applied in thermometers, thermometer testing/calibration, instruments, etc., can solve problems such as misdiagnosis, slow temperature rise response of temperature sensors, temperature rise differences, etc., to improve temperature rise responsiveness and reduce errors Effect of diagnosing risks and meeting monitoring requirements

Pending Publication Date: 2021-10-19
FAW JIEFANG AUTOMOTIVE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the temperature sensor downstream of the SCR fails, it needs to be dealt with in time, otherwise it will affect the SCR conversion efficiency
However, due to the slow temperature rise response of the temperature sensor downstream of the SCR, it will affect the responsiveness of real-time fault diagnosis
At the same time, based on the time accumulation of engine fuel injection volume, engine torque and other working conditions, it is determined that the temperature rise will also be affected by the ambient temperature. risk of diagnosis,

Method used

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  • SCR system downstream temperature sensor credibility fault diagnosis method

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Embodiment 1

[0036] like figure 1 As shown, the embodiment of the present invention provides an SCR system downstream temperature sensor trusted fault diagnosis method, the SCR system as part of the engine post-processing system, informing the exhaust system of the engine, including the upstream nitrogen oxygen sensor, downstream nitrogen oxygen sensor, Upstream temperature sensor, downstream temperature sensor and SCR vector, and the like. The diagnostic method specifically includes the following steps:

[0037] Step S1, set the enable area of ​​the downstream temperature sensor diagnosis according to the working condition information of the SCR system;

[0038]In this step S1, a first working process the main factors based SCR system, the downstream temperature sensor diagnostic setting for enabling area; SCR system condition information including environmental conditions and / or status conditions of the engine and / or the actuator status conditions and / or a sensor operating status condi...

Embodiment 2

[0059] Embodiment of the present invention provides a remote applications platform T-BOX calibration enable area, and the credibility of the fault diagnosis method using an SCR system downstream temperature sensor in the first embodiment of the method for enabling authentication area. Includes the following steps:

[0060] 1, using the T-BOX remote internet, collection vehicle nitrogen oxide sensor upstream of the SCR system, downstream of the nitrogen oxide sensor, the upstream temperature sensor and the measured values ​​of the downstream temperature sensor during actual road;

[0061] 2, the above-described collected large amounts of data through large data cleaning, processing, to calculate the SCR conversion efficiency in the SCR average efficiency efficient region, upstream of the SCR average temperature, SCR downstream average temperature, SCR support has an average temperature, finalized after correction theoretical threshold temperature upstream of the SCR and downstream ...

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Abstract

The invention belongs to the technical field of engine emission, and discloses an SCR system downstream temperature sensor credibility fault diagnosis method comprising the following steps: S1, calibrating a diagnosis enabling area according to SCR system working condition information; s2, according to an upstream nitrogen-oxygen sensor and a downstream nitrogen-oxygen sensor, obtaining the actually-measured flow of nitrogen-oxygen compounds, and calculating the SCR average efficiency within the set time period in the enabling area; according to a downstream temperature sensor, obtaining an SCR downstream temperature actual measurement value, and calculating the SCR downstream average temperature of the set time period in the enabling area; s3, calculating a theoretical threshold value of the SCR downstream temperature; s4, carrying out comparison, and if the SCR downstream average temperature is within the SCR downstream temperature theoretical threshold value, judging that the downstream temperature sensor is normal; otherwise, judging that the downstream temperature sensor fails. According to the credibility fault diagnosis method for the downstream temperature sensor of the SCR system, the diagnosis responsiveness is fast, the misdiagnosis risk is reduced, and the fault monitoring reliability is high.

Description

Technical field [0001] The present invention relates to the field of engine emissions, and more particularly to a trusted fault diagnosis method of downstream temperature sensor downstream temperature sensor. Background technique [0002] Diesel Engines have high thermal efficiency, power, economy and durability, and are widely used in transportation, construction machinery, agricultural machinery, etc., but the exhaust emissions of diesel engine have also caused a large impact on the atmospheric environment. The main emissions of the diesel engine include nitrogen oxides (NOx), hydrocarbon (HC), carbon monoxide (CO), and particulate matter (PM), and the like. The selective catalytic reduction (SCR) technology is the exhaust gas treatment technology applied to diesel trains, mainly used to process nitrogen oxides in motor vehicle exhaust gas. According to the physical characteristics of the copper-based SCR system, when the urea supply system is normal, when the ammonia storage o...

Claims

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Application Information

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IPC IPC(8): G01K15/00
CPCG01K15/007Y02T10/40
Inventor 李金沈嘉镔孙安邦宋文煜刘斌杨荣彬曹智
Owner FAW JIEFANG AUTOMOTIVE CO
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