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Gas assisting type SCR urea consumption low fault diagnosis method

A technology of fault diagnosis and consumption, which is applied to the diagnosis device of exhaust treatment device, exhaust treatment, noise reduction device, etc., and can solve the problems such as unsuitable air-assisted SCR system

Active Publication Date: 2020-02-18
SINO TRUK JINAN POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method is only applicable to the SCR system with urea return pipe, not applicable to the gas-assisted SCR system in the present invention

Method used

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  • Gas assisting type SCR urea consumption low fault diagnosis method
  • Gas assisting type SCR urea consumption low fault diagnosis method
  • Gas assisting type SCR urea consumption low fault diagnosis method

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Embodiment Construction

[0035] Attached below figure 1 to attach Image 6 The present invention will be further described.

[0036] An air-assisted SCR urea consumption fault diagnosis method, the air-assisted SCR system includes a urea nozzle 5, one of its input ends is connected to a compressed air storage tank 1 through an air pipeline through a pressure stabilizing valve 2, and its input end is another One way is connected to the output end of the diaphragm pump 10 through the urea pipeline, and the input end of the diaphragm pump 10 is connected to the urea tank 12 through the pressure relief valve 11; the SCR device 13, and the injection end of the urea nozzle 5 is connected to the input end of the SCR device 13; A pressure accumulator chamber 9, a metering valve 6, and a mixing chamber 4 are sequentially arranged on the urea pipeline from the diaphragm pump 10 to the urea nozzle 5, and the mixing chamber 4 is connected to the air pipeline through a connecting pipeline, and a blowback valve is...

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Abstract

The invention discloses a gas assisting type SCR urea consumption low fault diagnosis method. During urea active spraying testing, when the actual mixing cavity pressure and the urea consumption are low by different percent degrees, the threshold value is compared, fault diagnosis for the situation that the urea consumption is low by different percent degrees is achieved, and the fault of the lowurea consumption due to blockage of a urea metering valve, blockage of a urea pipeline between the urea metering valve and a urea nozzle or blockage of the urea nozzle is rapidly and accurately detected.

Description

technical field [0001] The invention relates to the technical field of vehicle fault detection, in particular to a fault diagnosis method for a gas-assisted SCR with low urea consumption. Background technique [0002] With the implementation of the sixth phase of the heavy-duty diesel vehicle emission regulations, in order to make the engine technology of heavy-duty diesel vehicles meet the emission standards, the SCR after-treatment system is introduced to reduce the NOx in the exhaust gas to harmless NOx by injecting urea solution into the exhaust gas. nitrogen, carbon dioxide and water. When the SCR system fails, such as when the urea nozzle is stuck in the normally closed position or the urea nozzle is blocked, the urea consumption is lower than the normal consumption required to restore NOx pollutants in the engine, which will cause air pollution. Therefore, the sixth stage of heavy-duty diesel vehicle emission regulations clearly requires the detection of low urea con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00F01N3/20F01N9/00
CPCF01N3/2066F01N3/208F01N11/00F01N2610/02F01N2610/08Y02T10/40
Inventor 李延红高发廷黄少文刘浩王秋花李成
Owner SINO TRUK JINAN POWER