CN203499778U - Scr electric control system - Google Patents
Scr electric control system Download PDFInfo
- Publication number
- CN203499778U CN203499778U CN201320621182.5U CN201320621182U CN203499778U CN 203499778 U CN203499778 U CN 203499778U CN 201320621182 U CN201320621182 U CN 201320621182U CN 203499778 U CN203499778 U CN 203499778U
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- CN
- China
- Prior art keywords
- reducing agent
- pipeline
- electric control
- valve
- scr
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Exhaust Gas After Treatment (AREA)
Abstract
The utility model provides an SCR electric control system which comprises electric control elements in the system, control units of the electric control elements, and an electric control circuit for connecting the control units and the electric control elements. The electric control elements include a reducing agent pipeline heater, a reducing agent injection valve, a gas pipeline control valve, a reducing agent storage sensor, an exhaust temperature sensor and a nitrogen and oxygen content sensor, wherein the reducing agent pipeline heater is arranged along a reducing agent injection pipeline, the reducing agent injection valve is arranged at the tail end of a reducing agent pipeline and used for injecting a reducing agent into an exhaust pipe, the gas pipeline control valve controls motions of compressed gas, the reducing agent storage sensor obtains system parameters, and the exhaust temperature sensor and the nitrogen and oxygen content sensor are arranged on the exhaust pipe. The control system is universal in SCR devices used for injecting the reducing agent under the drive of gas. Due to the fact that the control system can be precisely and automatically adjusted and controlled, the nitrogen and oxygen content in tail gas in a diesel engine can be accurately, timely and conveniently reduced.
Description
Technical field
The utility model relates to control system, especially processes the automatical control system of the SCR device of emission from vehicles.
Background technique
The pneumatic ejecting system of SCR need to be mapped to injection of reducing agent in engine exhaust pipe, and its automatical control system need to meet following requirement:
1) reducing agent is sprayed onto in outlet pipe quantitatively, makes it extraordinary and react on catalyzer with NOx effulent, this not only needs ejecting system to control accurately reducing agent injection amount, but also extraordinary atomizing effect need to be provided;
2) because some reducing agents can freeze at lower temperature, so system also needs to take the measure of thawing;
3) because the NOx generating under the different Operation Conditions of motor discharges pollutants, have a greater change, the working conditions change of motor is very frequent, therefore needs system according to engine operating condition, automatically to adjust and accurately control reducing agent injection amount.
Summary of the invention
The purpose of this utility model is to provide a kind of automatical control system that can automatically control the operation of the pneumatic ejecting system of SCR.
The technical solution adopted in the utility model is: a kind of SCR automatical control system, it is characterized in that: comprise electric control element and control unit thereof in system, the automatically controlled circuit that is communicated with control unit and each electric control element, electric control element comprises that being arranged on reducing agent sprays pipeline reducing agent pipeline heater along the line, be arranged on reducing agent pipeline end to the reducing agent injection valve of injection reduction agent in outlet pipe, control the control valve for gas pipeline of pressurized gas action, obtain the reducing agent storage sensor of systematic parameter, and be arranged on exhaust gas temperature sensor and the nitrogen oxygen level sensor on outlet pipe.Further, control unit also connects the cooling liquid solenoid valve being arranged on cooling line, and the reducing agent storage of flowing through of the cooling liquid in cooling line is heated to reducing agent.
Further, reducing agent storage sensor comprises pressure transducer, temperature transducer and liquid level sensor.
Further, control valve for gas pipeline comprises and builds pressure valve, Decompression valves and emptying valve.
Advantage and the good effect that the utlity model has are: control system of the present utility model is common to the SCR device of gas-powered injection reduction agent, by control system, accurately automatically adjust and control, can reduce accurately, in time, easily the nitrogen oxygen content in diesel engine vent gas.
Accompanying drawing explanation
Fig. 1 is structural principle schematic diagram of the present utility model
In figure:
1, pressure transducer 2, liquid level sensor 3, temperature transducer
4, automatically controlled circuit 5, cooling liquid solenoid valve 6, heater
7, urea-spray solenoid valve 8, urea pipe 9, exhaust gas temperature sensor
10, nitrogen oxygen level sensor 11, control valve for gas pipeline 12, gas piping
13, source of the gas
A, build pressure valve b, Decompression valves c, emptying valve
Embodiment
As shown in Figure 1, the pneumatic type urea-spray system of take is example, SCR automatical control system comprises the control unit of electric control element in overall system control, the automatically controlled circuit 4 that is communicated with control unit and each electric control element, electric control element comprises and is arranged on urea pipe heater along the line 6, be arranged on urea pipe 8 ends to the urea-spray solenoid valve 7 of injection reduction agent in outlet pipe, control the control valve for gas pipeline 11 of pressurized gas action, and the pressure transducer 1 that obtains systematic parameter, temperature transducer 3 and liquid level sensor 2, and be arranged on exhaust gas temperature sensor 9 and the nitrogen oxygen level sensor 10 on outlet pipe.
Control unit also connects the cooling liquid solenoid valve 5 being arranged on cooling line, and the cooling line reducing agent storage of flowing through is heated to reducing agent.Control valve for gas pipeline comprises builds pressure valve a, Decompression valves b and emptying valve c.
The function realizing by control unit in automatical control system is as follows:
1, control unit calculates urea injecting quantity according to engine operating condition, and revises urea injecting quantity according to the signal of exhaust gas temperature sensor and nitrogen oxide sensor feedback.
2, the signal feeding back by pressure transducer is controlled the open and close of urea tank supply air line control valve, to guarantee the relatively stable of tank internal pressure.
3, the signal feeding back by temperature transducer carrys out the switch of controlled circulation cooling water.
4, the signal feeding back by liquid level sensor judges the height of liquid level in tank.
5, by building pressure valve, to urea tank, provide pressure and keep the relatively stable of pressure, the aqueous solution of urea in urea tank being pressed into the front-end pipelines of urea-spray solenoid valve through filter cleaner, and measuring urea injecting quantity; Emptying valve is controlled road gas aqueous solution of urea between blowback urea tank and urea-spray solenoid valve when shutting down and is entered urea tank, plays emptying; Decompression valves is controlled the exhaust of urea pipe.
Above an embodiment of the present utility model is had been described in detail, but described content is only preferred embodiment of the present utility model, can not be considered to for limiting practical range of the present utility model.All equalization variations of doing according to the utility model application range and improvement etc., within all should still belonging to patent covering scope of the present utility model.
Claims (4)
1. a SCR automatical control system, it is characterized in that: comprise the automatically controlled circuit of electric control element in system and control unit, connection control unit and each electric control element, electric control element comprise be arranged on reducing agent spray pipeline reducing agent pipeline heater along the line, be arranged on reducing agent pipeline end to the reducing agent injection valve of injection reduction agent in outlet pipe, control the control valve for gas pipeline of pressurized gas action, obtain the reducing agent storage sensor of systematic parameter and be arranged on exhaust gas temperature sensor and the nitrogen oxygen level sensor on outlet pipe.
2. SCR automatical control system according to claim 1, is characterized in that: control unit also connects the cooling liquid solenoid valve being arranged on cooling line, and the reducing agent storage of flowing through of the cooling liquid in cooling line is heated to reducing agent.
3. SCR automatical control system according to claim 1, is characterized in that: reducing agent storage sensor comprises pressure transducer, temperature transducer and liquid level sensor.
4. SCR automatical control system according to claim 1, is characterized in that: control valve for gas pipeline comprises builds pressure valve, Decompression valves and emptying valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320621182.5U CN203499778U (en) | 2013-09-30 | 2013-09-30 | Scr electric control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320621182.5U CN203499778U (en) | 2013-09-30 | 2013-09-30 | Scr electric control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203499778U true CN203499778U (en) | 2014-03-26 |
Family
ID=50330767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320621182.5U Expired - Fee Related CN203499778U (en) | 2013-09-30 | 2013-09-30 | Scr electric control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203499778U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673147A (en) * | 2016-01-22 | 2016-06-15 | 潍柴动力股份有限公司 | Pressure building method and device of SCR system |
-
2013
- 2013-09-30 CN CN201320621182.5U patent/CN203499778U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673147A (en) * | 2016-01-22 | 2016-06-15 | 潍柴动力股份有限公司 | Pressure building method and device of SCR system |
| CN105673147B (en) * | 2016-01-22 | 2018-08-31 | 潍柴动力股份有限公司 | A kind of SCR system builds pressure method and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140326 Termination date: 20180930 |