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SCR (Selective Catalytic Reduction) system urea nozzle blockage identification method

A technology of SCR system and urea nozzle, applied in the field of SCR system, can solve problems such as failure to identify the blockage of urea nozzle, and achieve the effect of avoiding the failure of NOx exceeding the standard

Inactive Publication Date: 2019-04-26
SHANGHAI XINGRONG AUTOMOBILE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the SCR system is running on the vehicle, the partial clogging fault of the urea nozzle is still not recognized

Method used

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  • SCR (Selective Catalytic Reduction) system urea nozzle blockage identification method
  • SCR (Selective Catalytic Reduction) system urea nozzle blockage identification method
  • SCR (Selective Catalytic Reduction) system urea nozzle blockage identification method

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Embodiment Construction

[0022] The basic design idea of ​​the SCR system urea nozzle clogging identification method of the present invention is as follows:

[0023] See figure 1 , The SCR system generally consists of a urea tank 1, a urea supply module 2, a urea nozzle 3, a suction pipe 4, a pressure pipe 5, a liquid return pipe 6, and a controller 7.

[0024] In order to allow the urea nozzle 3 to eject the urea solution according to the predetermined injection amount, it is necessary to measure the pressure in the pressure pipe 5 in real time through the pressure sensor 21 integrated in the urea supply module 2, and to control the motor in the urea supply module 2 through the controller 7. The duty cycle keeps the pressure in the pressure pipe 5 stable, and finally controls the opening time of the solenoid valve of the urea nozzle 3 to achieve the purpose of spraying the set urea injection amount from the nozzle hole of the urea nozzle 3 .

[0025] During the process of spraying urea from the urea...

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Abstract

The invention discloses an SCR system urea nozzle blockage identification method. According to the SCR system urea nozzle blockage identification method, by means of monitoring comparison on pressurefluctuation amplitude inside a pressure pipe in the process of an urea nozzle being opened to jet, so that whether blockage exists in the urea nozzle or not is indirectly judged, under the situation of not adding additional components, the partial blockage situation of the urea nozzle can be distinguished, identification can be performed before the urea nozzle is completely blocked, equipment maintenance can be performed based on prompt information, occurrence of the vehicle NOx excess fault caused by failure jetting of urea is avoided, the function of monitoring the partial blockage of the urea nozzle can be carried out in the normal working process of an SCR system, and additional triggering motions are not needed.

Description

technical field [0001] The invention belongs to an SCR (Selective Catalytic Reduction) system, and in particular relates to a clogging identification method of a urea nozzle in an SCR system. Background technique [0002] With the continuous tightening of national regulations on motor vehicle exhaust emissions, more and more vehicles powered by diesel engines need to be equipped with SCR systems. The NOx reacts to produce N 2 and H 2 O. The accuracy of the injection amount of urea solution is a very important factor affecting NOx emission in automobile exhaust. [0003] In actual operation, due to the particle impurities in the urea solution and the influence of urea crystallization, the nozzle hole of the urea nozzle will gradually be blocked during use. The gradual clogging of nozzles will lead to less urea injection, which will lead to excessive NOx emissions in automobile exhaust and cause environmental pollution. At the same time, the OBD system on the vehicle will...

Claims

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Application Information

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IPC IPC(8): F01N11/00F01N3/20
CPCF01N3/208F01N11/00F01N2610/02F01N2610/1453Y02A50/20Y02T10/12Y02T10/40
Inventor 陈一平
Owner SHANGHAI XINGRONG AUTOMOBILE TECH CO LTD