Valve-group-controlling urea spraying system and control method thereof

A technology of urea injection system and valve group control, which is applied in the direction of electric control of exhaust treatment device, diagnostic device of exhaust treatment device, exhaust treatment, etc. It can solve the problems of inability to purging, residual liquid residue, poor precision, etc. problem, to achieve the effect of high cost, cost saving and high precision

Active Publication Date: 2020-11-06
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current urea injection system has two working modes: 1) The motor urea pump pumps and measures the urea solution into the exhaust pipe. This kind of urea injection system driven by a motor will have poor measurement accuracy due to fluctuations in urea pressure. ; 2) High pressure is applied in the urea tank, and the compressed gas in the urea tank is used to pump the urea into the exhaust pipe, which cannot be purged and is easy

Method used

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  • Valve-group-controlling urea spraying system and control method thereof
  • Valve-group-controlling urea spraying system and control method thereof
  • Valve-group-controlling urea spraying system and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0054] Example 1

[0055] like Figure 1-2 , The present invention provides urea injection control system for a valve, comprising a urea tank, urea nozzle 2, cooling water piping 3, the compressed air conduit 4, the urea pipe 5, gas discharge duct 6, the purge conduit 7, injection valve means 8.

[0056] Connection relationship between the pipes as: cooling water flowing through the duct 3 urea tank 1, the compressed air line 4 into a parallel from the gas source and each lead urea tank 1 leads a first air duct and urea nozzle 41 and the second 2 air duct 42, the urea from the urea pipe 5 leading to the extraction tank urea nozzle 2 1, the discharge gas pipe 6 leads from the urea tank 1 through the air, the urea purge conduit 7 communicating conduit 5 and the second air duct 42, the duct 5 comprises urea drawn from the urea urea tank 1 to the front pipe section 51 is connected to the purge conduit 7 and the nozzles leading to urea urea urea pipe section behind the front section 512...

Example Embodiment

[0085] Example 2

[0086] like image 3 , The urea injection system provided in a control valve of the present embodiment, the rest were the same except for the structure of Example 1: 1 urea tank fill level sensor 19 is also provided with the concentration sensor 20, liquid level sensor 19, the concentration sensor 20 signals the controller 9 is connected to the cooling water inlet pipe 3 and a cooling water screen 24, a compressed air inlet duct 4 and an air filter 25, a urea of ​​urea pipe 5 is provided at the inlet filter 26 , the deflation conduit 6 is provided with the air filter 27.

[0087] The method of controlling a urea injection system embodiment of the present embodiment is the same as in Example 1, is omitted.

Example Embodiment

[0088] Example 3

[0089] like Figure 4-5 , The urea injection system provided in a control valve of the present embodiment, in addition to regulating means for the proportional solenoid valves 13, the other structures are the same as in Example 1.

[0090] The method of controlling a urea injection system embodiment of the present embodiment, except for step S3, the remaining steps are the same as in Example 1, is omitted.

[0091] S3. Compressed air is mixed with the urea injection control

[0092] Pressure urea tank 1 and the controller 9 receives the target value of the urea injection command, the opening pressure of the second solenoid valve 12 and the air pressure adjustment means 13 controls the second air duct 42, operable to: air solenoid 12 of the second full open, the proportional solenoid valve duty cycle adjustment is required duty cycle the pre-measured at normal working pressure, a second air duct 42 so that the pressure is always maintained within a target range; o...

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Abstract

The invention discloses a valve-group-controlling urea spraying system and a control method thereof. The urea spraying system comprises a urea tank, a urea spray nozzle, a cooling water pipeline, a compressed air pipeline, a urea pipeline, a blow-off pipeline, a purging pipeline and a valve group spraying unit. The valve group spraying unit comprises a controller, a cooling water electromagnetic valve, a first air electromagnetic valve, a second air electromagnetic valve, a pressure regulating device, a purging electromagnetic valve, a spraying electromagnetic valve, a pressure sensor, a blow-off electromagnetic valve and a temperature sensor. Motive power is provided for the whole system through compressed air, metering is carried out through all the electromagnetic valves, feedback control over the opening degrees of the electromagnetic valves is performed through the temperature sensor and the pressure sensor, the urea spraying process is finished with low cost and high accuracy; and by means of the special purging pipeline and the special purging electromagnetic valve, purging can be performed on an upper section and a rear section of the urea pipeline, and thus the whole ureapipeline is free of residual urea after a car stops.

Description

technical field [0001] The invention relates to aftertreatment of exhaust gas, in particular to a urea injection system controlled by a valve group and a control method thereof. Background technique [0002] At present, Urea-SCR technology is considered to be the most effective way to reduce NOX emissions from vehicle diesel engines. After spraying urea aqueous solution with a mass fraction of 32.5% into the exhaust pipe through the urea injection system, it needs to go through collision, evaporation, hydrolysis, pyrolysis, etc. The process converts to NH3, which then reacts with NOx. [0003] The current urea injection system has two working modes: 1) The motor urea pump pumps and measures the urea solution into the exhaust pipe. This kind of urea injection system driven by a motor will have poor measurement accuracy due to fluctuations in urea pressure. ; 2) High pressure is applied in the urea tank, and the compressed gas in the urea tank is used to pump the urea into th...

Claims

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Application Information

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IPC IPC(8): F01N3/20F01N11/00
CPCF01N3/2006F01N3/2066F01N3/208F01N11/002F01N2570/14F01N2610/02F01N2610/14F01N2610/1426F01N2610/1453F01N2610/146F01N2610/148F01N2610/1486F01N2610/1493Y02T10/12Y02T10/40Y02A50/20
Inventor 陈旭冯坦张远徐傲陈镇何胜勇许法亮刘志辉李志明侯甲成
Owner DONGFENG COMML VEHICLE CO LTD
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