CN111188673B - Urea injection system and control method - Google Patents
Urea injection system and control method Download PDFInfo
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- CN111188673B CN111188673B CN201911323541.7A CN201911323541A CN111188673B CN 111188673 B CN111188673 B CN 111188673B CN 201911323541 A CN201911323541 A CN 201911323541A CN 111188673 B CN111188673 B CN 111188673B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2046—Periodically cooling catalytic reactors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
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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
- Y02T10/12—Improving ICE efficiencies
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a urea injection system and a control method, belonging to the technical field of diesel engine tail gas aftertreatment, wherein the urea injection system comprises an engine body, an engine water outlet pipe, a urea nozzle and a urea nozzle water inlet pipe, wherein the engine water outlet pipe is communicated with the urea nozzle water inlet pipe; the engine control unit electricity is connected with the flow sensor who is used for detecting exhaust gas flow, is used for detecting exhaust temperature's first temperature sensor, is used for detecting the rotational speed sensor of engine speed, is used for detecting ambient temperature's second temperature sensor and is used for detecting the pressure sensor of engine outlet pipe pressure, and this design can carry out the intelligent control of flow according to the actual needs of urea nozzle, improves urea injection system's cooling capacity.
Description
Technical Field
The invention belongs to the technical field of diesel engine tail gas aftertreatment, and particularly relates to a urea injection system and a control method.
Background
As emissions regulations escalate, aftertreatment has become the standard of engines and SCR (Selective Catalytic Reduction) Catalytic mufflers are the most effective way to treat nitrogen oxides, and urea injection systems are also the standard of SCR systems.
Due to the upgrading of the emission technical route, the temperature of the post-treatment is higher and higher, particularly when a Diesel Particulate Filter (DPF) is regenerated, the temperature resistance requirement on a urea injection system is higher and higher, and faults of the urea injection system occur in the product development and market verification processes, mainly due to the fact that a high-temperature roasting nozzle connector, a roasting wire harness and a high-temperature burning nozzle are burnt out in the active regeneration process. Therefore, improvements and enhancements to the cooling strategy and cooling capacity of urea injection systems are desired.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the urea injection system and the control method can solve the problem of high-temperature damage of the urea nozzle and realize intelligent control of flow according to actual needs of the urea nozzle.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a urea injection system comprises an engine body, an engine water outlet pipe, a urea nozzle and a urea nozzle water inlet pipe, wherein the engine water outlet pipe is communicated with the urea nozzle water inlet pipe; the engine control unit is electrically connected with a flow sensor for detecting the flow of exhaust gas, a first temperature sensor for detecting the temperature of exhaust gas, a rotating speed sensor for detecting the rotating speed of the engine, a second temperature sensor for detecting the ambient temperature and a pressure sensor for detecting the pressure of an outlet pipe of the engine.
Further, the first controller is a servo motor.
Further, the urea nozzle is provided with a butterfly valve for controlling the flow of the water inlet pipe of the urea nozzle, and the engine control unit controls the opening of the butterfly valve.
Further, the butterfly valve is controlled by the engine control unit through a second controller.
A method of controlling a urea injection system, comprising the steps of: a. the method comprises the steps that a flow sensor is used for collecting exhaust gas flow, a first temperature sensor is used for collecting exhaust temperature, and a rotating speed sensor is used for collecting engine rotating speed, collected data are transmitted to an engine control unit, and the engine control unit obtains the exhaust gas flow, the exhaust temperature and the urea nozzle temperature under the engine rotating speed according to the urea nozzle temperature pulse; b. collecting ambient temperature through a second temperature sensor, transmitting the collected data to the engine control unit, and correcting the temperature of the urea nozzle by the engine control unit according to a correction coefficient of the ambient temperature; c. acquiring pressure of an engine water outlet pipe through a pressure sensor, transmitting acquired data to the engine control unit, and obtaining the corrected urea nozzle temperature, the engine rotating speed and the flow required under the pressure of the engine water outlet pipe by the engine control unit according to flow pulse rate; d. the urea nozzle is characterized in that a water pump is installed on a water inlet pipe of the urea nozzle, an engine control unit obtains the required water pump rotating speed under the flow according to the water pump rotating speed pulse, and the engine control unit controls the water pump to reach the water pump rotating speed through a first controller.
Further, step c1 is included between step c and step d: install on the urea nozzle and be used for control the butterfly valve of urea nozzle inlet tube flow, engine control unit obtains according to butterfly valve aperture pulse the flow with required butterfly valve aperture under the engine speed, engine control unit control the butterfly valve reaches the butterfly valve aperture, up to the butterfly valve aperture reaches 100%.
Further, the butterfly valve is controlled by the engine control unit through a second controller.
After the technical scheme is adopted, the invention has the beneficial effects that:
the urea injection system comprises an engine body, an engine water outlet pipe, a urea nozzle water inlet pipe, an engine control unit, a water pump and a first controller, wherein the engine water outlet pipe is communicated with the urea nozzle water inlet pipe; the engine control unit is electrically connected with a flow sensor for detecting the flow of exhaust gas, a first temperature sensor for detecting the temperature of exhaust gas, a rotating speed sensor for detecting the rotating speed of an engine, a second temperature sensor for detecting the ambient temperature and a pressure sensor for detecting the pressure of an outlet pipe of the engine, and the engine control unit can control the water pump to adjust the flow flowing into the urea nozzle in real time through the first controller, so that the urea nozzle is ensured to be consistently at a proper temperature, and the cooling capacity of the urea injection system is improved.
The control method of the urea injection system monitors the temperature of the urea nozzle under various working conditions and environmental temperatures in real time through the engine control unit, and adjusts the flow of the cooling liquid through the rotating speed control of the attached water pump in time, so that the urea nozzle is ensured to be consistently at the proper temperature, and the cooling capacity of the urea injection system is improved.
In conclusion, the urea injection system and the control method solve the problems of high-temperature roasting nozzle connectors, roasting wire harnesses and roasting damaged nozzles in the active regeneration process in the prior art, can solve the problem of high-temperature roasting damaged of the urea nozzle, and intelligently control the flow of the cooling liquid according to the temperature of the urea nozzle in real time, so that the urea nozzle is always at the proper temperature, and the cooling capacity of the urea injection system is effectively improved.
Drawings
FIG. 1 is a schematic illustration of a urea injection system according to the present invention;
FIG. 2 is a control strategy diagram of a control method of a urea injection system according to the present invention;
in the figure, 1-an engine water outlet pipe, 2-a urea nozzle water inlet pipe, 3-a water pump, 4-a butterfly valve and 5-a urea nozzle.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
All directions referred to in the present specification are based on the drawings, and represent relative positional relationships only, and do not represent absolute positional relationships.
The first embodiment is as follows:
as shown in fig. 1, a urea injection system includes an engine body, an engine water outlet pipe 1, a urea nozzle 5 and a urea nozzle water inlet pipe 2, the engine water outlet pipe 1 is communicated with the urea nozzle water inlet pipe 2, the urea injection system also includes an engine control unit, a water pump 3 and a first controller M1, the water pump 3 is installed on the urea nozzle water inlet pipe 2, the water pump 3 is controlled by a first controller M1, and the first controller M1 is controlled by an engine control unit MCU. The engine control unit MCU is electrically connected with a flow sensor for detecting the flow of exhaust gas, a first temperature sensor for detecting the temperature of exhaust gas, a rotational speed sensor for detecting the rotational speed of the engine, a second temperature sensor for detecting the ambient temperature, and a pressure sensor for detecting the pressure of the engine outlet pipe 1 (none of the above sensors are shown in the drawings).
The first controller M1 is a rotating mechanism such as a motor and a motor controlled by the engine control unit MCU, and is preferably a servo motor, and the servo motor is in transmission connection with the water pump 3.
The urea nozzle 5 is also provided with a butterfly valve 4 for controlling the flow of the urea nozzle water inlet pipe 2, the opening of the butterfly valve is controlled by the engine control unit MCU, the opening of the butterfly valve 4 is controlled by the engine control unit MCU through a second controller M2, and the second controller M2 can also be a servo motor. The pipe diameter of the urea nozzle water inlet pipe 2 can be properly increased, and when the temperature of the urea nozzle 5 is lower, the flow is controlled through the butterfly valve 4. When the opening of the butterfly valve 4 reaches 100%, the required coolant flow cannot be achieved, and the rotation speed of the water pump 3 can be controlled to further increase the coolant flow.
When the urea injection system is controlled, firstly, the engine control unit MCU obtains the temperature (calibration pulse rate) of the urea nozzle 5 according to the working conditions of the engine (engine speed, exhaust temperature and exhaust gas flow rate), and the temperature is corrected by the ambient temperature. Secondly, the required coolant flow (calibration pulse) is obtained according to the corrected urea nozzle temperature, the engine speed and the pressure of the engine water outlet pipe 1, and the required butterfly valve opening (calibration pulse) is obtained according to the flow and the engine speed and is executed by the second controller M2. Finally, when the butterfly valve opening reaches the maximum and the flow rate is higher, the required rotation speed of the water pump 3 is calculated from the required coolant flow rate, and the first controller M1 controls the water pump 3 to increase the coolant flow rate further.
Example two:
as shown in fig. 2, a control method of a urea injection system includes the steps of:
a. the exhaust gas flow, the exhaust temperature and the engine rotating speed are acquired through the flow sensor, the first temperature sensor and the rotating speed sensor, the acquired data are transmitted to the engine control unit MCU, and the engine control unit MCU obtains the exhaust gas flow, the exhaust temperature and the urea nozzle temperature under the engine rotating speed according to the urea nozzle temperature pulse. The urea nozzle temperature pulse is formed by installing a temperature sensor for testing the temperature of the urea nozzle (used only during calibration) at the valve body part of the urea nozzle 5, calibrating the temperature on an engine calibration test bed, determining the temperature of the urea nozzle 5 under various working conditions (exhaust gas flow, exhaust temperature and engine speed) and calibrating a correction coefficient of the ambient temperature.
b. And acquiring the ambient temperature through a second temperature sensor, transmitting the acquired data to an engine control unit (MCU), and correcting the temperature of the urea nozzle by the MCU according to the correction coefficient of the ambient temperature. Wherein, the correction coefficient of the environmental temperature is obtained by calibration in advance.
c. The water pump 3 is installed on the urea nozzle water inlet pipe 2, the pressure of the engine water outlet pipe 1 is collected through the pressure sensor, the collected data are transmitted to the engine control unit MCU, and the engine control unit MCU obtains the corrected urea nozzle temperature, the engine rotating speed and the flow required under the pressure of the engine water outlet pipe 1 according to the flow pulse rate. Because the engine speed is fixed and the pressure of the water outlet pipe is fixed, the flow of the required cooling liquid can be calculated in advance through the temperature of the urea nozzle, and the flow pulse is obtained.
c1, the urea nozzle 5 is provided with a butterfly valve 4 for controlling the flow of the water inlet pipe 2 of the urea nozzle, the engine control unit MCU obtains the required butterfly valve opening degree under the flow and the engine speed according to the butterfly valve opening degree pulse, and the engine control unit MCU controls the butterfly valve 4 to reach the butterfly valve opening degree until the butterfly valve opening degree reaches 100%. The butterfly valve 4 is controlled by the engine control unit MCU through the second controller M2, and the second controller M2 may be a servo motor.
d. The engine control unit MCU obtains the water pump rotating speed required under the flow according to the water pump rotating speed pulse, and the engine control unit MCU controls the water pump 3 to reach the water pump rotating speed through the first controller M1. Wherein, the water pump rotation speed pulse is formed by calibrating the rotation speed of the water pump 3 at different flow rates in advance, and the first controller M1 can be a servo motor.
According to the urea injection system and the control method, the butterfly valve and the water pump are arranged on the water inlet pipe of the urea nozzle, the flow of the cooling liquid is controlled in real time according to the working condition of the engine, the urea nozzle is ensured to be at a proper temperature, and therefore the cooling capacity of the urea injection system is improved.
While specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the described embodiments are only some, and not all, of the present invention, which is presented by way of example only, and the scope of the invention is defined by the appended claims. Various changes or modifications to these embodiments may be made by those skilled in the art without departing from the principle and spirit of the invention, and these changes and modifications all fall within the scope of the invention.
Claims (6)
1. A urea injection system comprises an engine body, an engine water outlet pipe, a urea nozzle and a urea nozzle water inlet pipe, wherein the engine water outlet pipe is communicated with the urea nozzle water inlet pipe; the urea nozzle is provided with a butterfly valve for controlling the flow of the water inlet pipe of the urea nozzle, and the engine control unit controls the opening of the butterfly valve;
the engine control unit is electrically connected with a flow sensor for detecting the flow of exhaust gas, a first temperature sensor for detecting the temperature of exhaust gas, a rotating speed sensor for detecting the rotating speed of the engine, a second temperature sensor for detecting the ambient temperature and a pressure sensor for detecting the pressure of an outlet pipe of the engine;
the first controller calculates the flow rate of the required cooling water according to the flow rate of the exhaust gas, the exhaust temperature, the rotating speed of the engine, the ambient temperature and the pressure of the water outlet pipe of the engine, and controls the opening degree of the butterfly valve and the rotating speed of the water pump.
2. The urea injection system of claim 1, wherein the first controller is a servo motor.
3. The urea injection system of claim 1, wherein the butterfly valve is controlled by the engine control unit via a second controller.
4. A method of controlling a urea injection system as claimed in claim 1, characterized by comprising the steps of:
a. the method comprises the steps that a flow sensor is used for collecting exhaust gas flow, a first temperature sensor is used for collecting exhaust temperature, a rotating speed sensor is used for collecting engine rotating speed, collected data are transmitted to an engine control unit, and the engine control unit obtains the exhaust gas flow, the exhaust temperature and the urea nozzle temperature under the engine rotating speed according to the urea nozzle temperature pulse;
b. collecting ambient temperature through a second temperature sensor, transmitting the collected data to the engine control unit, and correcting the temperature of the urea nozzle by the engine control unit according to a correction coefficient of the ambient temperature;
c. acquiring pressure of an engine water outlet pipe through a pressure sensor, transmitting acquired data to the engine control unit, and obtaining the corrected urea nozzle temperature, the engine rotating speed and the flow required under the pressure of the engine water outlet pipe by the engine control unit according to flow pulse rate;
d. the urea nozzle is characterized in that a water pump is installed on a water inlet pipe of the urea nozzle, an engine control unit obtains the required water pump rotating speed under the flow according to the water pump rotating speed pulse, and the engine control unit controls the water pump to reach the water pump rotating speed through a first controller.
5. The control method according to claim 4, further comprising, between step c and step d, step c 1:
install on the urea nozzle and be used for control the butterfly valve of urea nozzle inlet tube flow, engine control unit obtains according to butterfly valve aperture pulse the flow with required butterfly valve aperture under the engine speed, engine control unit control the butterfly valve reaches the butterfly valve aperture, up to the butterfly valve aperture reaches 100%.
6. The control method of claim 5, wherein the butterfly valve is controlled by the engine control unit through a second controller.
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| CN201911323541.7A CN111188673B (en) | 2019-12-20 | 2019-12-20 | Urea injection system and control method |
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| CN201911323541.7A CN111188673B (en) | 2019-12-20 | 2019-12-20 | Urea injection system and control method |
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| CN111188673A CN111188673A (en) | 2020-05-22 |
| CN111188673B true CN111188673B (en) | 2021-08-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111994082B (en) * | 2020-08-31 | 2022-03-01 | 潍柴动力股份有限公司 | Regeneration temperature correction method and device, controller and vehicle |
| CN114645770B (en) * | 2021-05-25 | 2023-03-03 | 长城汽车股份有限公司 | Protection control method and device for urea nozzle, electronic equipment and vehicle |
| CN114790928B (en) * | 2021-06-22 | 2023-08-18 | 长城汽车股份有限公司 | Method and system for controlling urea water pump and vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009138627A (en) * | 2007-12-06 | 2009-06-25 | Hino Motors Ltd | Urea water addition nozzle |
| JP5388286B2 (en) * | 2009-06-19 | 2014-01-15 | ボッシュ株式会社 | Exhaust purification device and control method thereof |
| CN201865731U (en) * | 2010-12-06 | 2011-06-15 | 安徽江淮汽车股份有限公司 | Discharge post treatment system of light truck |
| US8635854B2 (en) * | 2011-08-05 | 2014-01-28 | Tenneco Automotive Operating Company Inc. | Reductant injection control system |
| US9234445B2 (en) * | 2013-06-06 | 2016-01-12 | Cummins Emission Solutions Inc. | Systems and techniques for nozzle cooling of diesel exhaust fluid injection systems |
| JP2016061274A (en) * | 2014-09-22 | 2016-04-25 | 株式会社クボタ | Engine exhaust purification device |
| CN107100701B (en) * | 2016-02-22 | 2020-08-04 | 天纳克（苏州）排放系统有限公司 | Nozzle assembly |
| CN207598325U (en) * | 2017-03-20 | 2018-07-10 | 天纳克（苏州）排放系统有限公司 | exhaust gas aftertreatment system |
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