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Online detecting method and device of SCR urea nozzle faults

The technology of a urea nozzle and a detection method is applied to the electronic control of the exhaust gas treatment device, the diagnosis device of the exhaust gas treatment device, the exhaust gas treatment and other directions, which can solve the problems of urea leakage and crystallization, reduce the crystallization phenomenon and improve the reliability. Effect

Active Publication Date: 2016-06-08
WEICHAI POWER CO LTD
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Problems solved by technology

The purpose of the invention is to solve the problem of urea leakage and crystallization caused by mechanical failure of the urea nozzle

Method used

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  • Online detecting method and device of SCR urea nozzle faults
  • Online detecting method and device of SCR urea nozzle faults
  • Online detecting method and device of SCR urea nozzle faults

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Embodiment Construction

[0042] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0043] Interpretation of terms involved in the present invention:

[0044] NOx: Nitrogen oxides, mainly including nitric oxide NO and nitrogen dioxide NO2.

[0045] SCR: Selective catalytic reduction system, using urea to decompose to produce ammonia, ammonia reacts with NOx under the action of a catalyst to reduce NOx emissions.

[0046] EEPROM: The area in the ECU used to store certain variables after power-off, and the variables stored in this area can be read from the last stored value after power-on.

[0047] NH3: Ammonia, the input of the SCR system is used to reduce NOx, which is toxic and strictly controlled by emission regulations.

[0048] NOx sensor: A sensor...

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Abstract

The invention provides an online detecting method of SCR urea nozzle faults. The method comprises the steps of: receiving a test triggering command of a diagnosis instrument by a driving computer ECU of a vehicle to be detected; obtaining a testing value of testing equipment according to the test triggering command, and judging if the testing value is in a preset range; if so, obtaining a upstream NOx measurement value of a SCR upstream NOx sensor in a first preset time period and a downstream NOx measurement value of a SCR downstream NOx sensor in the first preset time period; and obtaining a detection result of leakage of a urea nozzle according to the upstream NOx measurement value and the downstream NOx measurement value. The method obtains the detection result of leakage of the urea nozzle according to the upstream NOx measurement value of the upstream NOx sensor and the downstream NOx measurement value of the downstream NOx sensor, so that the leakage of the urea nozzle is judged online in real time, and the SCR reliability is improved. The invention further provides a detecting device.

Description

technical field [0001] The invention relates to an SCR urea nozzle fault online detection method and device. Background technique [0002] SCR is an essential after-treatment equipment for the Euro VI route (Euro VI is the emission standard for heavy-duty vehicles), and is used to remove NOx in the exhaust gas of diesel engines. refer to figure 1 , the mechanical structure of the SCR is: including the SCR box 1, an upstream exhaust gas pipe 2 and a downstream exhaust gas pipe 3 are respectively installed at both ends of the SCR box 1, an upstream NOx sensor 5 and a urea nozzle 4 are installed on the upstream exhaust gas pipe 2, and the urea The nozzle 4 is used to inject urea into the exhaust pipe, the downstream exhaust pipe 3 is equipped with a downstream NOx sensor 6, the upstream NOx sensor 5, the downstream NOx sensor 6 and the urea nozzle 4 are respectively connected to the trip computer ECU (not shown in the figure). The basic principle is to spray urea in front of ...

Claims

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Application Information

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IPC IPC(8): F01N11/00
CPCF01N11/00Y02A50/20Y02T10/40
Inventor 闫立冰刘兴义任宪丰秦涛
Owner WEICHAI POWER CO LTD
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