CN208473961U - A kind of urea injection system of crystallization-preventive - Google Patents
A kind of urea injection system of crystallization-preventive Download PDFInfo
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- CN208473961U CN208473961U CN201820956545.3U CN201820956545U CN208473961U CN 208473961 U CN208473961 U CN 208473961U CN 201820956545 U CN201820956545 U CN 201820956545U CN 208473961 U CN208473961 U CN 208473961U
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Abstract
A kind of urea injection system of crystallization-preventive, it includes urea pipe system and ECU, it is characterized in that: it further includes water route pipe-line system, and water route pipe-line system includes water tank, water pump, two-position three-way valve, water pump is connected to water tank, while being connected to a wherein valve road for two-position three-way valve, and urea pressure sensor is connected to a wherein valve road for two-position three-way valve, wherein a valve road is connected to urea nozzle with two-position three-way valve, and ECU controls the working condition of two-position three-way valve.The utility model solves the problems, such as urea crystals and the urea nozzle problem excessively high by temperature, has structure simple, low in cost, the good feature of using effect.
Description
Technical field
The utility model belongs to diesel engine vent gas post-processing technology field, in particular to the urea of a kind of crystallization-preventive sprays system
System.
Background technique
With the implementation of four emission regulation of commercial vehicle state, vehicle must install nitrogen oxides (NOx) discharging processing device additional.
Chinese medium and heavy-duty engines generally use selective catalytic reduction (SCR) technology path, i.e., by standard urea for vehicle
Aqueous solution is ejected into exhaust, and the ammonia generated is decomposed using it and carries out selective catalytic reduction to NOx, generates harmless nitrogen
And water.
But cause to urinate in use, there is a large amount of urea nozzle Crystallization Plugging problem in the actual market of urea system
Prime system system can not normal injection urea, and then occur vehicle limit turn round the problems such as, seriously affect user use.
At home, country announces to need to increase grain catcher in six emission regulation of the year two thousand twenty state of enforcement, heavy goods vehicles
(DPF) to meet granular material discharged requirement.DPF needs timing regeneration to clear up the soot of inner accumulation, but temperature is high when regeneration
Up to 650 DEG C or more, urea nozzle reliability is caused a significant threat.
Patent document 1 (CN106567762A) discloses a kind of system of urea dosing for exhaust after treatment system,
It include: the mixing chamber with urea inlet, gas access and outlet；It is configured to provide urea liquid to the urea inlet
Urea valve；The airflow channel extended from the gas access；It is configured to flowing to the airflow channel and the gas access
The air valve that pressurization gas is controlled；It is configured to carry out pressure sensitive at the downstream to the gas access and the urea inlet
Pressure sensor；And the controller with the pressure sensor, the urea valve and the air valve reliable communication, this is
System is characterized in that the controller is configured that actuate the urea valve and the air valve is mentioned with the outlet in the mixing chamber
For the mixed flow of urea liquid and air；Pressure information from the pressure sensor is assessed, the pressure information table
Show the pressure of the mixed flow；The air valve is closed based on the comparison to the pressure information and pressure threshold；When the pressure
Information actuates the urea pump when being lower than second threshold, and at least part of the mixing chamber is filled with urea liquid；And it beats
Air valve is opened so that urea liquid is discharged from the mixing chamber.
Patent document 2 (CN106870073A) discloses a kind of efficient crystallization-preventive urea nozzle, including nozzle body, described
Nozzle body top be connected with airflow duct, urea diversion pipe, it is characterised in that: the nozzle body is cylindrical,
Nozzle body lower end side is equipped with jet face, and the jet face is in half elliptic, sprays towards nozzle body internal stretch shape
At ejector block；Cavity, the cavity connection airflow duct are equipped with inside the nozzle body；The ejector block and water
The angle of plane is 30 to 75 degree, and the ejector block center connection urea diversion pipe, urea diversion pipe arc-shaped transition is described in
Ejector block center, urea diversion pipe extends to the jet face and forms urea liquid outlet；The ejector block is in urea
Diversion pipe periphery formed air ring cavity, the air ring cavity include air introduction segment, air caching section, air injection section,
Air introduction segment is arranged at the air ring cavity edge, and the connection air in air introduction segment end caches section, air
The section connection air injection section is cached, air injection section extends to the jet face and forms air outlet slit.
Patent document 3 (CN103814195B) discloses a kind of control for reducing SCR urea injection system crystallization risk
Method processed, which is characterized in that the control method include the following steps: (1) the SCR urea injection system from injection urea
Spray regime go to purging be present in the purging state of the urea liquid in pipeline after, by the SCR urea injection system
Air valve is opened, while so that the motor of the SCR urea injection system is stopped working, and purge first time period；(2) passing through
After the first time period, the air valve is closed, stops purging second time period；(3) passing through the second time period
And then it is secondary the air valve is opened, continue purge the third period, wherein execute above-mentioned steps at least once, then make institute
It states SCR urea injection system and enters pump and stop state.
For system disclosed in patent document 1, the status for being easy to appear crystallization without changing urea system is designed, it can only
Prompt user clears up urea crystals in time.
For system disclosed in patent document 2, mentality of designing is designed by optimizing flow passage, avoids savings urea, from
And achieve the purpose that avoid crystallization, but as long as circulation urea, just certainly exist urea accumulation crystallization, urea nozzle crystallisation problems do not have
Have and is solved at all.
For system disclosed in patent document 3, using gas purges the urea that fully erased can not be attached on wall surface
Liquid it could even be possible to accelerating the drying crystalline of urea, and leads to more serious crystallisation problems.
Summary of the invention
Problem to be solved in the utility model
1) urea nozzle Crystallization Plugging is solved the problems, such as；
2) six discharge phase of state is solved, urea nozzle is heated excessively high problem when dpf regeneration.
The technical solution of the utility model is as follows
A kind of urea injection system of crystallization-preventive, it includes urea pipe system and ECU, and wherein urea pipe system includes
Urea box, urea pump, urea nozzle, urea pressure sensor, urea pressure sensor be arranged in urea pump and urea nozzle it
Between, pressurized urea pressure is sensed, urea box is connected to urea pump, and ECU controls urea pump, urea pressure sensor, urea
Nozzle, it is characterized in that: it further includes water route pipe-line system, and water route pipe-line system includes water tank, water pump, two-position three-way valve, water pump
It is connected to water tank, while being connected to a wherein valve road for two-position three-way valve, urea pressure sensor and two-position three-way valve are wherein
The connection of one valve road, wherein a valve road is connected to urea nozzle with two-position three-way valve, and ECU controls the working condition of two-position three-way valve；One
As under working condition, ECU controls two-position three-way valve and urea nozzle communicating valve road is opened, the work of urea pipe system, urea spray
Mouth sprays urea according to ECU instruction at regular time and quantity；When need to clean urea nozzle and to urea nozzle cool down two kinds of working conditions
In one of working condition when, ECU control two-bit triplet Vavle switching, formed water tank, water pump, urea nozzle water route pipeline
System pass, while ECU controls water pump and is supplied to from urea nozzle from absorption pure water in water tank, is formed and is cleaned to urea nozzle
Or it is cooling.
The control method of the utility model are as follows:
1, crystallization-preventive control method, including three courses of work: urea back suction, urea cleaning, water back suction:
1) when the vehicle is running, urea pump is sprayed by drawing urea in urea box, and by pressurized urea supply to urea
In mouth, urea nozzle sprays urea according to ECU instruction at regular time and quantity, and the urea road that ECU controls two-position three-way valve at this time is opened, water
Road is closed；
2) urea Suction stroke: after vehicle stall, urea pump reversion, after urea pressure sensor pressure is negative value,
It controls urea nozzle and 90s is opened with 100% duty ratio, by the abundant back suction of urea solution in urea pipe and urea nozzle to urea
In case；
3) urea cleaning process: after urea pump back suction, ECU control two-position three-way valve is switched to water route, and water pump starts
Work, while controlling urea nozzle and 5s~10s is opened with 50% duty ratio, by two-position three-way valve, urea pipe, urea nozzle
A small amount of urea of interior remnants, since remaining urea amount is considerably less, ejects post-processing as water injection is into preprocessor
Urea in device not will cause urea crystals, will not cause damages to environment.
4) water Suction stroke: after urea cleans, water pump reversion, control urea nozzle is opened with 100% duty ratio
90s, by water back suction in urea pipe and urea nozzle into water tank.
2, when dpf regeneration urea nozzle be heated it is excessively high, urea pressure sensor, DPF outlet temperature sensor by correlation believe
It number is transferred to ECU, starts cooling urea nozzle, including three courses of work: urea back suction, injection cooling, water back suction:
1) urea Suction stroke: after reaching dpf regeneration condition, urea pump reversion is to urea pressure sensor pressure
After negative value, urea nozzle is controlled with 100% duty ratio and opens 90s, urea solution in urea pipe and urea nozzle is sufficiently anti-
It is drawn onto urea box；
2) spray temperature-fall period: just control starts dpf regeneration after urea Suction stroke, at this time two-bit triplet Vavle switching
To water route, water pump is started to work, while being controlled urea nozzle and being opened with 5%~10% duty ratio, until dpf regeneration process terminates
And DPF outlet temperature sensor temperature be lower than 400 DEG C when stop injection；
3) water Suction stroke: after urea cleans, water pump reversion, control urea nozzle is opened with 100% duty ratio
90s, by water back suction in urea pipe and urea nozzle into water tank.
The utility model solves the problems, such as urea crystals and the urea nozzle problem excessively high by temperature, has structure simple, at
This cheap, good feature of using effect.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
Specific embodiment
The essence of the utility model in order to better understand with specific language reference and describes embodiment party shown in the accompanying drawings
Formula.
The specific embodiment that according to the present invention will be described in detail below with reference to the accompanying drawings.
As shown in Figure 1, a kind of urea injection system of crystallization-preventive, it includes urea pipe system and ECU 8, wherein urea
Pipe-line system includes urea box 3, urea pump 4, urea nozzle 6, urea pressure sensor 7, and urea pressure sensor 7 is arranged in urine
Between element pump 4 and urea nozzle 6, pressurized urea pressure is sensed, urea box 3 is connected to urea pump 4, and ECU 8 controls urea
4, urea pressure sensor 7, urea nozzle 6 are pumped, it is characterized in that: it further includes water route pipe-line system, and water route pipe-line system includes
Water tank 1, water pump 2, two-position three-way valve 5, water pump 2 are connected to water tank 1, while being connected to a wherein valve road for two-position three-way valve 5, urine
Plain pressure sensor 7 is connected to a wherein valve road for two-position three-way valve 5, and wherein a valve road connects for urea nozzle 6 and two-position three-way valve 5
Logical, ECU 8 controls the working condition of two-position three-way valve 5；Under general work state, ECU 8 controls two-position three-way valve 5 and urea sprays
6 communicating valve road of mouth is opened, and urea pipe system work, urea nozzle 6 sprays urea according to the instruction of ECU 8 at regular time and quantity；When need
Clean urea nozzle and to urea nozzle cool down two kinds of working conditions in one of working condition when, ECU8 control two
Triple valve 5 switches, formed water tank 1, water pump 2, urea nozzle 6 water route pipeline system pass, while ECU8 controls water pump 2 from water
Pure water is drawn in case 1 to be supplied at urea nozzle 6, and cleaning or cooling are formed to urea nozzle 6.
The control method of the utility model are as follows:
1, crystallization-preventive control method, including three courses of work: urea back suction, urea cleaning, water back suction:
1) when the vehicle is running, urea pump 4 is by drawing urea in urea box 3, and by pressurized urea supply to urea
In nozzle 6, urea nozzle 6 sprays urea according to the instruction of ECU 8 at regular time and quantity, and ECU 8 controls the urea of two-position three-way valve 5 at this time
Road is opened, and water route is closed；
2) urea Suction stroke: after vehicle stall, urea pump 4 is inverted, and is negative value to 7 pressure of urea pressure sensor
Afterwards, control urea nozzle 6 opens 90s with 100% duty ratio, and the abundant back suction of urea solution in urea pipe and urea nozzle is arrived
In urea box 3；
3) urea cleaning process: after urea pump back suction, ECU 8 controls two-position three-way valve 5 and is switched to water route, water pump 2
It starts to work, while controlling urea nozzle and 5s~10s is opened with 50% duty ratio, by two-position three-way valve 5, urea pipe, urine
Remaining a small amount of urea, since remaining urea amount is considerably less, is ejected as water injection is into preprocessor in plain nozzle 6
Urea in preprocessor not will cause urea crystals, will not cause damages to environment.
4) water Suction stroke: after urea cleans, water pump 2 is inverted, and controls urea nozzle 6 with the unlatching of 100% duty ratio
90s, by water back suction in urea pipe and urea nozzle 6 into water tank 1.
2, start cooling 6 control method of urea nozzle, urea nozzle 6 is heated excessively high, urea pressure sensor when dpf regeneration
7, DPF outlet temperature sensor 10 is by correlation signal transmission to ECU 8, including three courses of work: urea back suction, injection drop
Temperature, water back suction:
1) urea Suction stroke: after reaching dpf regeneration condition, urea pump 4 is inverted, to 7 pressure of urea pressure sensor
After negative value, urea nozzle 6 is controlled with 100% duty ratio and opens 90s, urea solution in urea pipe and urea nozzle is abundant
In back suction to urea box 3；
2) spray temperature-fall period: just control starting DPF 9 regenerates after urea Suction stroke, at this time two-position three-way valve 5
It is switched to water route, water pump 2 is started to work, while being controlled urea nozzle and being opened with 5%~10% duty ratio, until DPF 9 regenerates
Stop injection when process terminates and 10 temperature of DPF outlet temperature sensor is lower than 400 DEG C；
3) water Suction stroke: after urea cleans, water pump 2 is inverted, and controls urea nozzle 6 with the unlatching of 100% duty ratio
90s, by water back suction in urea pipe and urea nozzle 6 into water tank 1.
Through studying, the crystallization reason of urea nozzle is mainly remaining a small amount of urea quilt in urea nozzle after vehicle stall
The waste-heat of exhaust system is converted into substance not soluble in water, urea nozzle is caused to block.The utility model passes through waterway tube
Road cleaning systems, without remaining urea in urea nozzle after stopping working, so being not in urea crystals problem；When dpf regeneration generates
When high temperature, urea nozzle spray cooling solves the problems, such as that urea nozzle is excessively high by temperature.
It is understood, however, that these are not restrictions to the scope of the utility model, any alternative and right
The further modification of the embodiment shown and to the essence of the utility model described herein it is further apply for
It is all foreseeable for those skilled in the art.
Claims (1)
1. a kind of urea injection system of crystallization-preventive, it includes urea pipe system and ECU (8), wherein urea pipe system packet
It includes urea box (3), urea pump (4), urea nozzle (6), urea pressure sensor (7), urea pressure sensor (7) is arranged in urine
Between element pump (4) and urea nozzle (6), urea box (3) is connected to urea pump (4), and ECU (8) controls urea pump (4), urea pressure
Force snesor (7), urea nozzle (6), it is characterized in that: it further includes water route pipe-line system, and water route pipe-line system includes water tank
(1), water pump (2), two-position three-way valve (5), water pump (2) are connected to water tank (1), while the wherein valve with two-position three-way valve (5)
Road connection, urea pressure sensor (7) are connected to a wherein valve road for two-position three-way valve (5), urea nozzle (6) and two-bit triplet
Wherein a valve road is connected to valve (5), and ECU (8) controls two-position three-way valve (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820956545.3U CN208473961U (en) | 2018-06-20 | 2018-06-20 | A kind of urea injection system of crystallization-preventive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820956545.3U CN208473961U (en) | 2018-06-20 | 2018-06-20 | A kind of urea injection system of crystallization-preventive |
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| Publication Number | Publication Date |
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| CN208473961U true CN208473961U (en) | 2019-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820956545.3U Active CN208473961U (en) | 2018-06-20 | 2018-06-20 | A kind of urea injection system of crystallization-preventive |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108590820A (en) * | 2018-06-20 | 2018-09-28 | 中国第汽车股份有限公司 | A kind of urea injection system and its control method of crystallization-preventive |
| CN110905635A (en) * | 2019-12-05 | 2020-03-24 | 潍柴动力股份有限公司 | Cleaning method and device for urea pump |
-
2018
- 2018-06-20 CN CN201820956545.3U patent/CN208473961U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108590820A (en) * | 2018-06-20 | 2018-09-28 | 中国第汽车股份有限公司 | A kind of urea injection system and its control method of crystallization-preventive |
| CN110905635A (en) * | 2019-12-05 | 2020-03-24 | 潍柴动力股份有限公司 | Cleaning method and device for urea pump |
| CN110905635B (en) * | 2019-12-05 | 2021-02-23 | 潍柴动力股份有限公司 | Cleaning method and device for urea pump |
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