CN206801657U - A kind of order urea injection system - Google Patents
A kind of order urea injection system Download PDFInfo
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- CN206801657U CN206801657U CN201720382906.3U CN201720382906U CN206801657U CN 206801657 U CN206801657 U CN 206801657U CN 201720382906 U CN201720382906 U CN 201720382906U CN 206801657 U CN206801657 U CN 206801657U
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- urea
- pressure
- injection controller
- nozzle
- urea injection
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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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Abstract
The utility model discloses a kind of order urea injection system, the utility model uses a urea tank, a high pressure urea pump, a urea pressure accumulation rail, one or more urea nozzles, a urea injection controller, and urea pipe and control circuit.Urea injection controller can be engine electric-controlled unit or independent urea control module.Urea is pumped into urea pressure accumulation rail by high pressure urea pump from urea tank, is established and is kept urea pressure.The urea pressure signal that urea injection controller feeds back according to urea pressure sensor adjusts the urea pressure in urea pressure accumulation rail.Urea injection controller determines the urea time for spraying of corresponding each cylinder according to the exhaust moment of each cylinder.Urea injection controller calculates the urea amount required for corresponding each cylinder further according to the exhausted air quantity that each cylinder is discharged.Urea injection controller control urea nozzle is opened, and sprays into correct urea amount to blast pipe correct at the time of.
Description
Art
It the utility model is related to a kind of motor vehicle emission after-treatment system for being based on SCR (abbreviation SCR).It is special
It is not related to a kind of urea injection system.
Background technology
At present, using the motor vehicle emission after-treatment system of SCR be by a urea tank, a urea pump,
One urea nozzle and urea pipe composition.By engine electric-controlled unit or independent urea control module control urea pump handle
Urea pumps out from urea tank, then controls urea nozzle to open and urea is sprayed into blast pipe.
The shortcomings that this design is：1) urea time for spraying is controlled not in accordance with the exhausting sequence of each cylinder of engine, made
Into urea injection advance or lagged in the exhaust moment of each cylinder of engine, the ammonia that hydrolysis of urea obtains can not be with exhaust simultaneously
Catalyst converter is reached, nitrogen oxides reduction reaction time deficiency, causes urea to waste；2) not in accordance with the row of each cylinder of engine
Tolerance controls urea injecting quantity, the urea amount for causing urea injecting quantity to be more or less than required for each cylinder capacity of engine；
Urea injecting quantity deficiency, nitrogen oxides reduction is not thorough, and discharge is poor；Urea injection is excessive, causes the increase of ammonia escape amount, even
Unnecessary urea deposits form urea crystals in catalyst converter；3) urea injection pressure is non-constant, and urea injecting quantity calculates inaccurate
Really；4) urea nozzle is used, at the time of control urea injection and urea injecting quantity limited flexibility.Asked to solve these
Topic, prior art are entered often through increase catalyst converter volume, shortening gas exhaust piping length, installation site of optimization urea nozzle etc.
Row is improved, but these improvement can be obtained that effect is smaller, and urea is consumed all more than the 5% of fuel consumption.
The content of the invention
The shortcomings that in order to overcome the motor vehicle emission after-treatment system of existing SCR to exist, the utility model carries
For a kind of joint-track type order urea injection system.The characteristics of program is to remain that urea sprays in engine operation process
Pressure is constant.The time for spraying of urea is determined according to the exhaust moment of each cylinder, determines that urea sprays according to the capacity of each cylinder
The amount of penetrating, realize corresponding to urea time for spraying, the exhaust moment of emitted dose and each cylinder of engine, capacity.
The utility model uses a urea tank, a high pressure urea pump, urea pressure accumulation rail, an one or more urea
Nozzle, a urea injection controller, and urea pipe and control circuit.There are urea reflux circuit and ureometer on urea pump
Valve is measured, has urea pressure sensor and relief valve on urea pressure accumulation rail.Urea injection controller can be engine electric-controlled unit,
It can also be independent urea control module.
Urea is pumped into urea pressure accumulation rail by high pressure urea pump from urea tank, is established and is kept urea pressure.Urea pressure
Urea pressure signal is sent to urea injection controller by sensor, and urea injection controller feeds back according to urea pressure sensor
Urea pressure signal regulation urea metering valve aperture, adjust urea pressure accumulation rail in urea pressure.If urea pressure accumulation rail
Interior urea pressure bears pressure more than urea pressure accumulation rail, then the relief valve on urea pressure accumulation rail is opened, and reduces urea pressure accumulation
Pressure in rail.
Urea injection controller calculates the exhaust of each cylinder according to engine rotational speed signal and the first cylinder top dead centre signal
Moment.Then exhaust flow rate is calculated according to engine speed, at the time of reaching catalyst converter so as to calculate the waste gas of each cylinder discharge,
With this determination urea time for spraying.Urea injection controller calculates required basic urine further according to air inflow and fuel injection amount
Element amount.After basic urea amount is determined, urea injection controller is further according to delivery temperature, environment temperature, engine speed etc. pair
Basic urea amount is modified, and finally calculates the final urea injecting quantity corresponding to each cylinder of engine.It is determined that urea sprays
After penetrating moment and final urea injecting quantity, urea injection controller controls corresponding urea nozzle to open, correct at the time of to
Blast pipe sprays into correct urea amount.
The beneficial effects of the utility model are, using high pressure urea pump, to realize the high-pressure injection of urea, and atomization is good, with
Nox in exhaust is sufficiently mixed, and reaches optimum response effect；Urea is in high pressure conditions in pipeline, reduces crystallization
Risk；Urea is constantly in flow regime in the presence of urea pump, also will not condense or crystallize even in winter；Urea pressure
It is constant, urea injecting quantity can be accurately controlled, the problem of excessive or insufficient is sprayed in the absence of urea, had both met regulation to discharge
It is required that reducing urea consumption again, reduce vehicle use cost；Urine is accurately controlled according to the exhausting sequence of each cylinder of engine
Plain time for spraying so that urea and high-temperature exhaust air reach catalyst converter simultaneously, to greatest extent the nitrogen oxides in reduction exhaust.
Brief description of the drawings
The utility model is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 is practical application of the utility model on six cylinder engine, uses six urea nozzles.
(1) urea tank in figure, (2) urea pump, (3) urea pressure accumulation rail, (4) relief valve, (5) urea tube, the spray of (6) urea
Mouth, (7) urea nozzle control line, (8) urea injection controller, (9) catalyst converter, (10) blast pipe
Embodiment
The utility model using a urea tank, a high pressure urea pump, a urea pressure accumulation rail, multiple urea nozzles,
One urea injection controller, and urea pipe and control circuit.There are urea reflux circuit and urea metering valve on urea pump,
There are urea pressure sensor and relief valve on urea pressure accumulation rail.Urea injection controller can be engine electric-controlled unit, also may be used
To be independent urea control module.
In Fig. 1, urea is pumped into urea pressure accumulation rail 3 by high pressure urea pump 2 from urea tank 1, is established and is kept urea pressure
Urea pressure signal is sent to urea injection controller by power, urea pressure sensor, and urea injection controller is according to urea pressure
The aperture of the urea pressure signal regulation urea metering valve of force snesor feedback, adjusts the urea pressure in urea pressure accumulation rail.Urine
During hypertonia in plain pressure accumulation rail, relief valve 4 is opened, and urea flows back to urea tank 1 by urea tube, is reduced in urea pressure accumulation rail
Pressure.Urea nozzle 6 is connected to urea pressure accumulation rail 3 by urea tube.Urea injection controller 8 passes through urea nozzle control line
7 control the opening and closing of urea nozzle 6.Urea nozzle 6 is arranged to multiple, and urea nozzle 6 sprays into the urea of blast pipe 10
The waste gas of engine discharge in ammonia and blast pipe 10 after hydrolysis proceeds by nitrogen oxides after reaching catalyst converter 9 simultaneously
Reduction reaction, structure is only illustrative shown in Fig. 1.
In being applied shown in Fig. 1, urea injection controller 8 is according to engine rotational speed signal and the first cylinder top dead centre signal
The exhaust moment of each cylinder of engine is determined, based on exhaust pipe length and exhaust flow rate, it may be determined that an injecting time delay
T, delay t can be a kind of variable delay, be based on needing delay t to be equal to 0 certainly, so that it is determined that urea nozzle 6 is opened
Open the moment.Urea injection controller 8 calculates the exhaust of each cylinder of engine always according to air input of engine by air and fuel injection amount
Amount, based on urea needed for per unit capacity or the determination of combined fuel injection amount, so as to calculate corresponding each cylinder capacity institute
The basic urea amount needed.Urea injection controller 8 is further according to information such as environment temperature, delivery temperature, engine speed to base
This urea injecting quantity is modified, and calculates the final urea injection required for the exhausted air quantity of each cylinder discharge of corresponding engine
Amount.Wherein can be according to size configuration, the exhaust of single injection amount, engine peak speed, engine cylinder of urea nozzle
Amount etc. determines the quantity of urea nozzle, such as can select to be identical with engine cylinder number, and formation corresponds, of course for section
Cost-saving, quick upgrading, simplify structure etc. it can also be provided that single-nozzle, urea injection controller is to injecting time and injection
Amount is quickly controlled.Realize corresponding to urea time for spraying, the exhaust moment of emitted dose and each cylinder of engine, capacity.
The beneficial effects of the utility model are, using high pressure urea pump, to realize the high-pressure injection of urea, completely atomization, with
Nox in exhaust is sufficiently mixed, and reaches optimum response effect；Urea is in high pressure conditions in pipeline, reduces crystallization
Risk；Urea is constantly in flow regime in the presence of urea pump, also will not condense or crystallize even in winter；Urea pressure
It is constant, urea injecting quantity can be accurately controlled, the problem of excessive or insufficient is sprayed in the absence of urea, had both met regulation to discharge
It is required that reducing urea consumption again, reduce vehicle use cost；Urine is accurately controlled according to the exhausting sequence of each cylinder of engine
Plain time for spraying so that urea and high-temperature exhaust air reach catalyst converter simultaneously, to greatest extent the nitrogen oxides in reduction exhaust.Pass through
To the relatively accurate injecting time of nozzle and the control of emitted dose so that urea consumption is reduced to the 3%- of fuel consumption
5%, and the urea consumption of conventional selective catalysis reduction after-treatment system is generally the 5%-10% of fuel consumption, this is just
Urea consumption is greatly reduced, obtains unexpected protrusion effect.
Although the foregoing describing specific embodiment of the present utility model, those familiar with the art should
Work as understanding, the specific embodiment described by us is merely exemplary, rather than for the limit to the scope of the utility model
Fixed, those skilled in the art should in the equivalent modification and change made according to spirit of the present utility model
Cover in scope of the claimed protection of the present utility model.
Claims (7)
1. a kind of order urea injection system, it includes urea injection controller, urea nozzle control line, urea tube, urea spray
Mouth, it is characterised in that including multiple, each urea nozzle connects the urea nozzle with urea tube, urea nozzle control line respectively
Connect, the urea nozzle control line is connected with urea injection controller, and urea injection controller is controlled by the urea nozzle
Line traffic control urea nozzle sequence-injection urea.
2. order urea injection system according to claim 1,
Urea injection controller opens corresponding urea nozzle based on exhaust moment of identified each cylinder, capacity.
3. order urea injection system according to claim 1, it is characterized in that urea injection controller can be engine
ECU.
4. order urea injection system according to claim 1, it is characterized in that also including urea pressure accumulation rail, the urea pressure accumulation
The urea that rail is used to keep constant sprays pressure.
5. order urea injection system according to claim 1, it is characterized in that also including pressure-regulating device, the pressure is adjusted
Regulating device is used to the urea pressure in pressure accumulation rail is adjusted and controlled.
6. order urea injection system according to claim 1, it is characterized in that also including high pressure urea pump, the high pressure urea
Pump is used to lift urea pressure, and it is high pressure urea to spray into blast pipe.
7. order urea injection system according to claim 1, it is characterized in that urea injection controller can be engine
A part for ECU or independent urea injection control module, the spraying system also include urea tank, pressure release
Valve, catalyst converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720382906.3U CN206801657U (en) | 2017-04-13 | 2017-04-13 | A kind of order urea injection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720382906.3U CN206801657U (en) | 2017-04-13 | 2017-04-13 | A kind of order urea injection system |
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| CN206801657U true CN206801657U (en) | 2017-12-26 |
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| CN201720382906.3U Active CN206801657U (en) | 2017-04-13 | 2017-04-13 | A kind of order urea injection system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111120061A (en) * | 2019-12-30 | 2020-05-08 | 广州城市职业学院 | SCR system monitoring and fault diagnosis equipment and method |
| CN111287824A (en) * | 2020-02-21 | 2020-06-16 | 无锡威孚力达催化净化器有限责任公司 | Control method, device and system for urea pump in air-assisted SCR system |
| CN113107654A (en) * | 2021-05-20 | 2021-07-13 | 潍柴动力股份有限公司 | Double-urea injection control system and control method |
| CN113669145A (en) * | 2021-09-30 | 2021-11-19 | 中国重汽集团济南动力有限公司 | Air-assisted SCR urea dual-injection fault diagnosis system and method |
-
2017
- 2017-04-13 CN CN201720382906.3U patent/CN206801657U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111120061A (en) * | 2019-12-30 | 2020-05-08 | 广州城市职业学院 | SCR system monitoring and fault diagnosis equipment and method |
| CN111287824A (en) * | 2020-02-21 | 2020-06-16 | 无锡威孚力达催化净化器有限责任公司 | Control method, device and system for urea pump in air-assisted SCR system |
| CN111287824B (en) * | 2020-02-21 | 2022-04-12 | 无锡威孚力达催化净化器有限责任公司 | Control method, device and system for urea pump in air-assisted SCR system |
| CN113107654A (en) * | 2021-05-20 | 2021-07-13 | 潍柴动力股份有限公司 | Double-urea injection control system and control method |
| CN113669145A (en) * | 2021-09-30 | 2021-11-19 | 中国重汽集团济南动力有限公司 | Air-assisted SCR urea dual-injection fault diagnosis system and method |
| CN113669145B (en) * | 2021-09-30 | 2023-01-03 | 中国重汽集团济南动力有限公司 | Air-assisted SCR urea dual-injection fault diagnosis system and method |
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