CN111197516A - Independent metering gas drive urea injection system - Google Patents
Independent metering gas drive urea injection system Download PDFInfo
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- CN111197516A CN111197516A CN202010026139.9A CN202010026139A CN111197516A CN 111197516 A CN111197516 A CN 111197516A CN 202010026139 A CN202010026139 A CN 202010026139A CN 111197516 A CN111197516 A CN 111197516A
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- urea
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- metering unit
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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
- F01N3/18—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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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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
- F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
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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
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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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- 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
- F01N2610/1486—Means to prevent the substance from freezing
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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
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention relates to an independently metered gas-driven urea injection system, which comprises a gas storage device, a urea storage device, a metering unit and an injection device which are sequentially connected; the metering unit comprises a control valve, a urea rail and a metering valve which are connected in sequence; a rail pressure sensor is arranged on the urea rail; the urea storage device is connected with the control valve. The system provided by the invention is closed through the control valve of the independent metering unit, the pressure in the urea tank is prevented from being transferred to the urea nozzle, the function of not exhausting after the urea system is flamed out is realized, meanwhile, the independent metering unit can accurately control the urea injection quantity, the urea nozzle can adopt a mechanical nozzle, the structure is simple, and the risk of frost crack of the urea nozzle is reduced.
Description
Technical Field
The invention relates to the technical field of urea injection systems, in particular to an independent metering gas drive urea injection system.
Background
At present, with the stricter emission regulations, most commercial vehicle diesel engines adopt a urea injection system to reduce the emission of nitrogen oxides in exhaust gas. Urea injection systems can be classified into three main types, namely, a urea pump-driven type, a gas-driven type, and a gas-assisted type. The gas-driven urea injection system has a simple structure and is low in cost because a urea pump is not arranged.
At present, a gas-driven urea injection system is divided into an exhaust type and a non-exhaust type, the exhaust type exhausts after a vehicle is shut down, the demand of compressed air for the whole vehicle is increased, when the system is applied to small vehicles such as light vehicles, the power of an air-pressure pump is low, the capacity of a vehicle air storage cylinder is small, meanwhile, compressed air needs to be consumed by pneumatic braking in mountainous areas, the bad experience that a user waits for the vehicle to be inflated is caused, the pressure of the non-exhaust type urea system is high, the freezing crack risk of an electric control urea nozzle is easy to occur in cold areas, exhaust control can be controlled after the temperature of minus 11 ℃, the problem of freezing crack is solved by controlling the urea nozzle to inject urea for a period of time, and urea crystals in an exhaust pipe are.
CN101975102A discloses a pneumatic single urea box full-bleed emptying pipeline SCR urea system, which can realize pneumatic control of the urea system through an intake and exhaust valve. The compressed gas that the whole car of system demand provided is sufficient, and when using in small-size vehicles such as light car, the air-pressure pump power is little, and vehicle gas receiver capacity is little, and pneumatic brake in mountain area needs to consume compressed air simultaneously to cause the user to wait for the inflated bad experience of vehicle. Meanwhile, the problem of frost cracking of the nozzle is solved by controlling exhaust at-11 ℃ and controlling the urea nozzle to spray for a period of time, but urea is sprayed into the exhaust pipe after the vehicle is stopped, so that urea crystals in the exhaust pipe are easily caused.
CN101975101A discloses a pneumatic type single urea case non-gassing emptying pipeline SCR urea system, has realized the function that the system does not exhaust. But the pressure of the urea system after the urea is not exhausted is high, and the electric control urea nozzle is easy to have the risk of frost crack in a cold area.
CN106640294A discloses a two pressure sensor formula gas drive urea injection system and control method, the gas circuit pressure sensor that detects system pressure and the liquid circuit pressure sensor that can detect injection pressure, ECU realizes the precision control to the urea nozzle, the accurate judgement to urea nozzle operating condition and the realization is maintained the urea filter according to the accurate timing of resistance through the integrated analysis to gas circuit pressure sensor and liquid circuit pressure sensor signal. However, the urea control accuracy and the fault diagnosis capability are improved only by adding the pressure sensor, and the problems that the gas drive system does not exhaust gas and the urea nozzle is frost crack cannot be solved.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide an independent metering gas-driven urea injection system, which is closed by a control valve of an independent metering unit, blocks the pressure in a urea tank from being transmitted to a urea nozzle, realizes the function of not exhausting after the urea system is shut down, can accurately control the urea injection quantity by the independent metering unit, adopts a mechanical nozzle as the urea nozzle, has a simple structure, and reduces the risk of frost cracking of the urea nozzle.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an independently metered gas-driven urea injection system, which comprises a gas storage device, a urea storage device, a metering unit and an injection device which are sequentially connected;
the metering unit comprises a control valve, a urea rail and a metering valve which are connected in sequence; a rail pressure sensor is arranged on the urea rail;
the urea storage device is connected with the control valve;
the injection device is connected to the metering valve.
According to the independent metering gas-driven urea injection system, the compressed gas is controlled to enter the urea tank by adding the electric control air inlet valve, the independent metering unit is added in the system, dynamic control of all valves in the system is realized by the independent metering unit and combining with the EDU, the compressed gas enters the urea tank, the pressure in the urea tank is regulated and controlled to be transmitted to the urea nozzle, the urea tank is ensured not to exhaust, the urea injection amount can be accurately controlled by the pressure sensor and the electric control valve of the independent metering device, the urea injection amount can be accurately controlled by the independent metering unit, and meanwhile, the urea nozzle adopts a mechanical nozzle, so that the structure is simple, and the problem of frost cracking of the urea nozzle can be avoided.
As a preferable technical scheme of the invention, the gas storage device comprises a gas storage device, a first filter and a gas valve which are sequentially connected.
Preferably, the gas storage device stores compressed gas.
Preferably, the air valve is an electrically controlled air inlet valve.
As a preferable technical solution of the present invention, the urea storage device includes a urea tank and a second filter connected in sequence.
Preferably, the gas valve is connected to the urea tank.
Preferably, a pressure sensor, a temperature sensor and a liquid level sensor are arranged on the urea tank.
Preferably, the second filter is connected to the metering unit.
Preferably, when the pressure value detected by the pressure sensor is smaller than a preset value, the air valve is opened.
As a preferred embodiment of the present invention, the injection device includes a nozzle.
Preferably, the nozzle is a mechanical nozzle.
The mechanical nozzle adopted in the invention has a simple structure, and can remarkably reduce the problem of frost cracking of the urea nozzle.
As a preferable aspect of the present invention, the urea injection system further includes a heating unit.
Preferably, the heating unit includes a hot water supply device, a water valve, a heating part, and a cold water return device connected in sequence.
Preferably, the heating part includes a first heating part and a second heating part connected in parallel.
In a preferred aspect of the present invention, the first heating unit is provided in the urea tank.
Preferably, the second heating part is provided in the metering unit.
According to the invention, hot water generated by heat exchange and temperature reduction of components in the vehicle is used for heating and unfreezing the urea in the urea injection system, so that the urea is prevented from being solidified or separated out, and further, the efficient utilization of heat energy is effectively improved.
As a preferable aspect of the present invention, the pipeline between the urea storage device and the second filter is an electric heating pipeline.
Preferably, the line between the second filter and the metering unit is an electrically heated line.
Preferably, the line between the metering unit and the injection device is an electrically heated line.
In the invention, the pipeline starts to be heated when the temperature of the urea in the urea storage device is lower than the preset temperature, so that the utilization that the urea cannot be injected due to the blockage of the pipeline is avoided.
As a preferable technical solution of the present invention, the rail pressure value detected by the rail pressure sensor is greater than a preset rail pressure value, and the metering valve is opened.
According to the invention, the control of urea injection is realized through the arrangement of the metering unit, further, the loss of compressed air under low pressure can be prevented, and the efficient and reasonable utilization of the compressed air is realized.
As a preferable technical scheme of the invention, the liquid level value detected by the liquid level sensor is smaller than a preset liquid level value, and the control valve is closed.
Preferably, the control valve is a normally closed valve.
Preferably, the temperature value detected by the temperature sensor is smaller than a preset temperature value, and the water valve is opened.
According to the invention, through reasonable arrangement of the control valve, the pressurized urea solution can stay in the urea storage device after the vehicle is flamed out, so that the purpose of not exhausting gas by self in the system after flameout is realized, and the bad experience of waiting for vehicle inflation of a user is eliminated. Furthermore, according to the invention, the liquid level sensor is arranged on the urea storage device to prevent compressed air from entering the independent metering unit and the urea filter, so that unnecessary loss and waste of compressed air are avoided, and the utilization rate of the compressed air is improved.
As a preferable aspect of the present invention, the urea storage device is provided with a valve for exhaust gas during maintenance or addition of urea.
Preferably, the valve is disposed on the urea tank.
Preferably, the valve is a manual mechanical valve.
According to the invention, the urea storage device is provided with a valve for maintaining or adding urea for exhaust, and the valve is opened to discharge compressed gas during urea addition or maintenance so as to ensure the safety of a urea system during urea addition.
The preset value can be set reasonably according to actual application scenes. Furthermore, the water valve, the air valve, the control valve and the metering valve can be connected through the EDU or other intelligent control systems and can be controlled automatically by using the sensors or manually as required.
The independent metering urea injection system provided by the invention solves the problems in the prior art through the design of the independent metering unit and the nozzle. Further, compressed gas in a gas storage device in the system is conveyed to the urea storage device through a pipeline to pressurize the urea; when a pressure sensor arranged in the urea storage device detects that a pressure value is larger than a preset value, the air valve is closed, and a control valve in a metering unit connected with the urea storage device is opened, so that the urea solution is conveyed into the metering unit, a metering valve in the metering unit is in a closed state, urea in the metering unit is pressurized in a urea rail, and when a rail pressure value detected by a rail pressure sensor arranged on the urea rail is larger than the preset value, the metering valve is opened; and the urea solution enters the injection device to complete the injection of urea.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, through reasonable configuration of each unit in the urea injection system, the function of no exhaust after the urea system is extinguished is realized.
(2) According to the urea spraying device, the urea spraying amount is accurately controlled by arranging the independent metering unit, and meanwhile, the urea nozzle can adopt a mechanical nozzle, so that the structure is simple, and the risk of frost cracking of the urea nozzle is reduced.
Drawings
FIG. 1 is a schematic diagram of an independently metered gas-driven urea injection system according to an embodiment of the present disclosure;
FIG. 2 is a schematic of urea injection system control feedback provided by an embodiment of the present invention;
the system comprises a water valve 1, a valve 2, an air valve 3, a pressure sensor 4, a temperature sensor 5, a liquid level sensor 6, a control valve 7, a urea rail 8, a metering valve 9 and a rail pressure sensor 10.
The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:
example 1
The embodiment provides an independently metered gas-driven urea injection system, as shown in fig. 1, the existing urea injection system used in the automobile industry is divided into an exhaust type and a non-exhaust type, the exhaust type exhausts after a vehicle is shut down, and the demand of compressed air of the whole vehicle is increased; and the non-exhaust urea system has high pressure, and the electric control urea nozzle is easy to have frost cracking risk in a cold area.
In order to solve the above problems, the present embodiment provides an independently metered gas-driven urea injection system, where the urea injection system includes a gas storage device, a urea storage device, a metering unit, and an injection device, which are connected in sequence; the metering unit comprises a control valve 7, a urea rail 8 and a metering valve 9 which are connected in sequence; a rail pressure sensor 10 is arranged on the urea rail 8; the urea storage device is connected with the control valve 7; the injection device is connected to the metering valve 9.
Further, the gas storage device comprises a gas storage device, a first filter and a gas valve 3 which are connected in sequence; compressed gas is stored in the gas storage device; the air valve 3 is an electric control air inlet valve.
Further, the urea storage device comprises a urea tank and a second filter which are connected in sequence; the gas valve is connected with the urea tank; the urea tank is provided with a pressure sensor 4, a temperature sensor 5 and a liquid level sensor 6; the second filter is connected with the metering unit; and when the pressure value detected by the pressure sensor 4 is smaller than a preset value, the air valve 3 is opened.
Further, the spraying device comprises a nozzle; the nozzle is a mechanical nozzle.
Further, the urea injection system further comprises a heating unit; the heating unit comprises a hot water supply device, a water valve 1, a heating part and a cold water return device which are sequentially connected; the heating part includes a first heating part and a second heating part connected in parallel.
Further, the first heating unit is provided in the urea tank; the second heating unit is disposed in the metering unit.
Furthermore, a pipeline between the urea storage device and the second filter is an electric heating pipeline; a pipeline between the second filter and the metering unit is an electric heating pipeline; and a pipeline between the metering unit and the injection device is an electric heating pipeline.
Further, the rail pressure value detected by the rail pressure sensor 10 is greater than a preset rail pressure value, and the metering valve 9 is opened.
Further, the liquid level value detected by the liquid level sensor 6 is smaller than a preset liquid level value, and the control valve 7 is closed; the control valve 7 is a normally-closed valve; and the temperature value detected by the temperature sensor 5 is less than a preset temperature value, and the water valve 1 is opened.
Further, a valve 2 for exhausting gas in the process of maintaining or adding urea is arranged in the urea storage device; the valve 2 is arranged on the urea tank; preferably, the valve 2 is a manual mechanical valve.
Example 2
The embodiment provides an intelligent control metering gas drive urea injection system, as shown in fig. 1 and 2, compressed gas is firstly processed by a gas storage tank through a first filter, and then enters a urea tank through a gas valve 3 to supplement pressure for the urea tank. The air valve 3 is automatically controlled through an EDU (electronic data Unit) connected with the pressure sensor 4, and when the pressure value detected by the pressure sensor 4 is smaller than a preset value, the EDU controls the air valve 3 to be opened to supplement pressure for the urea tank; wherein the air valve 3 is an electric control valve
When the pressure in the urea tank reaches the standard, the urea solution with the pressure enters the metering unit after being treated by the second filter; the metering unit comprises a control valve 7, a urea rail 8, a metering valve 9 and a rail pressure sensor 10 arranged on the metering valve 9; after the control valve 7 is opened, urea with pressure enters the urea rail 8, a rail pressure sensor 10 arranged on the urea rail 8 detects the rail pressure value of the urea rail 8, when the detected rail pressure value reaches a preset value, the EDU opens a metering valve 9 connected with the EDU, the urea solution amount is accurately metered and enters a mechanical urea nozzle, and urea injection is completed; the urea tank is also provided with a liquid level sensor 6, and when the liquid level value detected by the liquid level sensor 6 is lower than a preset value, the EDU closes a control valve 7 connected with the EDU so as to prevent compressed gas from entering the metering unit and the second filter; wherein, control valve 7 is normally closed valve, and after the vehicle was put out fire, the area pressed urea solution can't get into in the urea rail 8 through control valve 7, realized that the urea system does not exhaust after putting out fire.
Furthermore, a heating unit is arranged in the system, and the heating unit heats and unfreezes the whole system by using cold-zone hot water in the running process of the vehicle; the urea tank and the metering unit are respectively heated by a first heating part and a second heating part arranged in the heating unit; the urea tank is also provided with a temperature sensor 5, and when the detection value of the temperature sensor 5 is lower than a preset value, the EDU controls the water valve 1 connected with the EDU to be opened so as to heat the urea solution in the urea tank and the metering unit; furthermore, a pipeline between the urea tank and the second filter is an electric heating pipeline; a pipeline between the second filter and the metering unit is an electric heating pipeline; the pipeline between the metering unit and the nozzle is an electric heating pipeline, and when the temperature is low, the electric heating pipeline starts to work to heat and unfreeze the pipeline.
Further, a valve 2 for exhausting gas in the process of maintaining or adding urea is arranged in the urea storage device; the valve 2 is arranged on the urea tank; wherein, the valve 2 is a manual mechanical valve.
In this embodiment, the urea system closes through independent metering unit's control valve, blocks the pressure in the urea jar and to the urea nozzle transmission, realizes the function that the urea system does not exhaust after flame-out, and independent metering unit can accurate control urea injection volume simultaneously, and the urea nozzle adopts mechanical nozzle, simple structure reduces the risk that the urea nozzle freezes.
The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. The urea injection system is characterized by comprising a gas storage device, a urea storage device, a metering unit and an injection device which are sequentially connected;
the metering unit comprises a control valve, a urea rail and a metering valve which are connected in sequence; a rail pressure sensor is arranged on the urea rail;
the urea storage device is connected with the control valve;
the injection device is connected to the metering valve.
2. The urea injection system of claim 1, wherein the gas storage means comprises a gas storage device, a first filter and a gas valve connected in series;
preferably, the gas storage device stores compressed gas;
preferably, the air valve is an electrically controlled air inlet valve.
3. A urea injection system according to claim 2, wherein said urea storage means comprises a urea tank and a second filter connected in series;
preferably, the gas valve is connected with the urea tank;
preferably, a pressure sensor, a temperature sensor and a liquid level sensor are arranged on the urea tank;
preferably, the second filter is connected with the metering unit;
preferably, when the pressure value detected by the pressure sensor is smaller than a preset value, the air valve is opened.
4. The urea injection system of claim 1, wherein the injection device comprises a nozzle;
preferably, the nozzle is a mechanical nozzle.
5. Urea injection system according to any one of the claims 1-4, characterized in that the urea injection system further comprises a heating unit;
preferably, the heating unit comprises a hot water supply device, a water valve, a heating part and a cold water return device which are connected in sequence;
preferably, the heating part includes a first heating part and a second heating part connected in parallel.
6. The urea injection system according to claim 5, wherein the first heating portion is provided in the urea tank;
preferably, the second heating part is provided in the metering unit.
7. Urea injection system according to any one of the claims 1-6, characterised in that the line between the urea storage means and the second filter is an electrically heated line;
preferably, the pipeline between the second filter and the metering unit is an electric heating pipeline;
preferably, the line between the metering unit and the injection device is an electrically heated line.
8. A urea injection system as claimed in any one of claims 1-7, characterized in that said rail pressure sensor detects a rail pressure value greater than a preset rail pressure value, said metering valve being open.
9. The urea injection system of claim 5, wherein the level sensor detects a level value less than a preset level value, and the control valve is closed;
preferably, the control valve is a normally closed valve;
preferably, the temperature value detected by the temperature sensor is smaller than a preset temperature value, and the water valve is opened.
10. A urea injection system according to any one of claims 1-9, characterized in that a valve for exhaust gases when servicing or adding urea is arranged in the urea storage;
preferably, the valve is arranged on the urea tank;
preferably, the valve is a manual mechanical valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010026139.9A CN111197516A (en) | 2020-01-10 | 2020-01-10 | Independent metering gas drive urea injection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010026139.9A CN111197516A (en) | 2020-01-10 | 2020-01-10 | Independent metering gas drive urea injection system |
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| Publication Number | Publication Date |
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| CN111197516A true CN111197516A (en) | 2020-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010026139.9A Pending CN111197516A (en) | 2020-01-10 | 2020-01-10 | Independent metering gas drive urea injection system |
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| CN (1) | CN111197516A (en) |
Cited By (6)
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| CN106640294A (en) * | 2017-01-23 | 2017-05-10 | 中国第汽车股份有限公司 | Dual-pressure-transducer type gas-driven urea injection system and control method |
| CN111894705A (en) * | 2020-07-24 | 2020-11-06 | 东风商用车有限公司 | Urea heating and unfreezing control method based on temperature model |
| CN111894707A (en) * | 2020-07-24 | 2020-11-06 | 东风商用车有限公司 | Valve bank controlled urea injection system and control method thereof |
| CN112576346A (en) * | 2020-12-02 | 2021-03-30 | 一汽解放汽车有限公司 | Exhaust control method of gas drive urea pump system |
| CN114483267A (en) * | 2022-02-23 | 2022-05-13 | 一汽解放汽车有限公司 | Supply device and control method for SCR (selective catalytic reduction) dual-injection urea for vehicle |
| CN114352392B (en) * | 2022-01-25 | 2024-04-16 | 潍柴动力股份有限公司 | Prevent downstream NO x Sensor burst method, post-processing system and vehicle |
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| CN106640294A (en) * | 2017-01-23 | 2017-05-10 | 中国第汽车股份有限公司 | Dual-pressure-transducer type gas-driven urea injection system and control method |
| CN106640294B (en) * | 2017-01-23 | 2023-02-03 | 中国第一汽车股份有限公司 | Dual-pressure-sensor type gas-drive urea injection system and control method |
| CN111894705A (en) * | 2020-07-24 | 2020-11-06 | 东风商用车有限公司 | Urea heating and unfreezing control method based on temperature model |
| CN111894707A (en) * | 2020-07-24 | 2020-11-06 | 东风商用车有限公司 | Valve bank controlled urea injection system and control method thereof |
| CN111894705B (en) * | 2020-07-24 | 2021-05-28 | 东风商用车有限公司 | Urea heating and unfreezing control method based on temperature model |
| CN111894707B (en) * | 2020-07-24 | 2021-11-23 | 东风商用车有限公司 | Valve bank controlled urea injection system and control method thereof |
| CN112576346A (en) * | 2020-12-02 | 2021-03-30 | 一汽解放汽车有限公司 | Exhaust control method of gas drive urea pump system |
| CN114352392B (en) * | 2022-01-25 | 2024-04-16 | 潍柴动力股份有限公司 | Prevent downstream NO x Sensor burst method, post-processing system and vehicle |
| CN114483267A (en) * | 2022-02-23 | 2022-05-13 | 一汽解放汽车有限公司 | Supply device and control method for SCR (selective catalytic reduction) dual-injection urea for vehicle |
| CN114483267B (en) * | 2022-02-23 | 2023-03-10 | 一汽解放汽车有限公司 | Supply device and control method for SCR (selective catalytic reduction) dual-injection urea for vehicle |
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Application publication date: 20200526 |