CN206554996U - A kind of dual pressure sensor formula gas drive urea injection system - Google Patents
A kind of dual pressure sensor formula gas drive urea injection system Download PDFInfo
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- CN206554996U CN206554996U CN201720086045.4U CN201720086045U CN206554996U CN 206554996 U CN206554996 U CN 206554996U CN 201720086045 U CN201720086045 U CN 201720086045U CN 206554996 U CN206554996 U CN 206554996U
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- urea
- pressure sensor
- nozzle
- cleaner
- tank
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Exhaust Gas After Treatment (AREA)
Abstract
The utility model discloses a kind of dual pressure sensor formula gas drive urea injection system, including urea tank, urea cleaner, source of the gas, urea nozzle and controller ECU；Urea tank, which is provided with intake valve and air bleeding valve, urea tank, is provided with airline pressure sensor；Urea cleaner is connected with urea tank and urea nozzle respectively；The fluid path pressure sensor being connected with controller ECU is provided between urea cleaner and urea nozzle；The fluid path pressure sensor includes control chip, sensor connector, thermally conductive sheet and electrical heating urea tube.The airline pressure sensor that the utility model can be detected to system pressure and the fluid path pressure sensor that injection pressure can be detected, ECU is realized the precision controlling to urea nozzle, the accurate judgement to urea nozzle working condition and realized and urea cleaner is maintained by resistance accurate timing by the comprehensive analysis to airline pressure sensor and fluid path pressure sensor signal.
Description
Technical field
The utility model is related to diesel engine vent gas post processing field, particularly a kind of dual pressure sensor formula gas drive urea spray
Penetrate system.
Background technology
With the implementation of the Abgasgesetz of commercial car state IV, vehicle must install nitrogen oxides additional（NOx）Exhaust aftertreatment devices.
The medium and heavy-duty engines of current China, generally using SCR（SCR）Technology path, i.e., by standard vehicle
It is ejected into aqueous solution of urea in exhaust, the ammonia produced using its decomposition（NH3）SCR is carried out to NOx, it is raw
Into harmless nitrogen（N2）And water（H2O）.
Patent document 1（CN201010513101.0）In describe a kind of pneumatic single-urea box full-deflating emptying pipeline
Urea solution filler, temperature and liquid level sensor, urea box pressure sensor, heating are arranged above SCR urea systems, urea box
Pipeline, compressed gas enters compressed gas pipeline I and compressed gas pipeline III, is deflated to compressed gas magnetic valve B, compressed gas
Control valve A, compressed gas control valve B, compressed gas control valve C are located at the compressed air hose between automobile air cylinder and urea box
Lu Zhong, urea solution cleaner is located in the urea solution feeding pipe between urea box and urea fluid injector；ECU signals control pressure
Contracting gas control valve A, compressed gas control valve B, tri- magnetic valves of compressed gas control valve C and urea fluid injector.
Patent document 2（CN201020661310.5）In describe a kind of cutoff hole of pneumatic-type single urea box deflation emptying formula
Urea system, compressed gas magnetic valve is located in the compressed air line between automobile air cylinder and urea box, and cutoff hole is located at
In urea pipe between compressed gas magnetic valve and internal or external urea cleaner and urea injector, internal or external urine
Plain liquid cleaner is located in the urea solution feeding pipe between urea box and urea fluid injector；ECU control signals A, ECU are controlled
Signal B, ECU control signal C controls compressed gas control valve and compressed gas magnetic valve and urea fluid injector.
Patent document 3（CN201010513102.5）Report a kind of non-deflation emptying pipeline SCR of pneumatic-type single urea box
Urea system, by urea solution filler, urea box, water heating pipe road, urea solution temperature and liquid level signal, atmospheric temperature signal,
SCR inlet temperature signal, NOx signals, urea box pressure signal, ECU control signals are divided into signal I, signal II, signal III, urine
Plain injector, urea injector cooling line, urea box heat control valve, compressed gas control valve A and compressed gas magnetic valve
B, compressed gas pipeline a and compressed gas pipeline b, urea woven hose, urea solution cleaner composition.
For SCR urea systems disclosed in above-mentioned patent document 1, patent document 2 and patent document 3, respectively describe
The related notion of gas drive system, and airline pressure sensor is additionally arranged in urea box, for the gas pressure in urea box
Power is detected.
However, ECU can not be monitored to the blockage of urea cleaner, more such case can not effectively be protected
Shield.When urea filter restriction, urea injection pressure reduction further results in the reduction of urea nozzle emitted dose, spraying and deteriorated,
Cause to discharge in exceeded, after-treatment system and crystallize.
Further, ECU can not be also judged urea nozzle working condition, such as when urea nozzle is blocked, ECU
System operation irregularity can only be judged, cause system to report an error out-focus, increase maintenance investigation difficulty.
Utility model content
The technical problems to be solved in the utility model is to be directed to above-mentioned the deficiencies in the prior art, and provides a kind of pair of pressure biography
Sensor formula gas drive urea injection system, the dual pressure sensor formula gas drive urea injection system, which has, to be examined to system pressure
The airline pressure sensor of survey and the fluid path pressure sensor that can be detected to injection pressure, ECU to airline pressure by passing
The comprehensive analysis of sensor and fluid path pressure sensor signal, realizes the precision controlling to urea nozzle, work urea nozzle shape
The accurate judgement of state and to urea cleaner by resistance accurate timing maintain.
In order to solve the above technical problems, the technical solution adopted in the utility model is：
A kind of dual pressure sensor formula gas drive urea injection system, including the spray of urea tank, urea cleaner, source of the gas, urea
Mouth and controller ECU；Intake valve and air bleeding valve are provided with urea tank, the inlet end of intake valve is connected with source of the gas；Urea tank
Inside it is additionally provided with airline pressure sensor；The input of urea cleaner is connected with urea tank, the output end of urea cleaner
It is connected with urea nozzle；Intake valve, air bleeding valve, airline pressure sensor and urea nozzle are connected with controller ECU；
The fluid path pressure sensor being connected with controller ECU is provided between urea cleaner and urea nozzle；The fluid path pressure is passed
Sensor includes control chip, sensor connector, thermally conductive sheet and electrical heating urea tube.
Sensor connector is fixedly installed in the two ends of control chip, each sensor connector and is provided with fluid course,
The internal face of each fluid course is provided with thermally conductive sheet；The periphery of each sensor connector is set with electrical heating urea tube.
Be in contact with the urea periphery of part of the control chip is coated with freeze protected rubber.
Each sensor connector uses the quick connector of SAEJ2044 standards.
The voltage endurance capability of urea tank is more than 12bar.
The utility model is used after said structure, the airline pressure sensor that can be detected to system pressure and can be to spraying
The fluid path pressure sensor that injection pressure is detected, ECU passes through to airline pressure sensor and fluid path pressure sensor signal
Comprehensive analysis, realizes three below purpose：
1. optimizing system pressure control, the control accuracy to urea nozzle is improved, it is to avoid system discharges exceeded or urea knot
It is brilliant.
2. optimizing system OBD precision, the accurate judgement to urea nozzle working condition is realized.
3. a pair urea filter restriction problem is accurately judged, realize that urea cleaner is maintained by resistance accurate timing.
Brief description of the drawings
Fig. 1 shows a kind of structural representation of dual pressure sensor formula gas drive urea injection system of the utility model.
Fig. 2 shows change schematic diagram of the fluid path pressure when urea nozzle is sprayed.
Fig. 3 shows fluid path pressure change schematic diagram of the urea nozzle under different injection frequencies.
Fig. 4 shows the vertical section structure schematic diagram of fluid path pressure sensor.
Wherein have：1. urea tank；2. urea cleaner；3. intake valve；4. air bleeding valve；5. airline pressure sensor；6. liquid
Road pressure sensor；601. control chip；602. freeze protected rubber；603. sensor connector；604. thermally conductive sheet；605. liquid circulate
Road；606. figure contacts；607. electrical heating urea tubes；7. urea nozzle；8. controller ECU；9. source of the gas.
Embodiment
The utility model is described in further detail with specific better embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of dual pressure sensor formula gas drive urea injection system, including urea tank 1, urea cleaner 2,
Source of the gas 9, urea nozzle 7 and controller ECU 8.
The voltage endurance capability of urea tank, which is preferably greater than in 12bar, urea tank, is provided with intake valve 3 and air bleeding valve 4, intake valve
Inlet end is connected with source of the gas.Airline pressure sensor 5 is additionally provided with urea tank, for providing urea to controller ECU 8
The pressure signal of compressed gas in tank.
The input of urea cleaner is connected with urea tank, and the output end of urea cleaner is connected with urea nozzle.
The impurity that urea cleaner is used in filter urea liquid, it is to avoid impurity causes to damage to urea nozzle 7.
Fluid path pressure sensor 6 is provided between urea cleaner and urea nozzle, the spray for measuring urea nozzle 7
Injection pressure.
Controller ECU 8 sets urea injecting quantity according to engine operating condition, and controls urea nozzle 7 to spray.
Above-mentioned intake valve 3, air bleeding valve 4, airline pressure sensor 5, fluid path pressure sensor 6 and urea nozzle 7 with control
Device ECU processed is connected
As shown in figure 4, fluid path pressure sensor 6 includes control chip 601, sensor connector 603, thermally conductive sheet 604 and electricity
Heating urea pipe 607.
Control chip is preferred to use Infineon SP270 pressure chips.
Sensor connector is fixedly installed on the two ends of control chip, and each sensor connector is preferred to use SAEJ2044 marks
Accurate quick connector.
Fluid course is provided with each sensor connector, the internal face of each fluid course is provided with thermally conductive sheet.
The periphery of each sensor connector is set with electrical heating urea tube, and the periphery of preferably each sensor connector is all provided with
Convex contact 606 is equipped with, electrical heating urea tube is engaged with corresponding convex contact.
In low temperature, there is ice blockage risk in fluid path pressure sensor 6, if design adds on fluid path pressure sensor 6
Heat structure cost is high, control is complicated.Fluid path pressure sensor 6 is using after said structure, when electrical heating urea tube is heated, heat conduction
Piece is transferred heat to inside fluid path pressure sensor 6, so that urea thaws in sensor.Simultaneously by sensor connector 603
Plastic construction is all designed as etc. main part, fully the inside of reduction fluid path pressure sensor 6 and outside temperature conduction.
Further, be in contact with the urea periphery of part of control chip is coated with freeze protected rubber.Freeze protected rubber is existing material
Material, the freeze protected rubber material as disclosed in 201510408284.2.
Urea can produce volumetric expansion when freezing, and exist the swollen bad risk of control chip 601, the setting of freeze protected rubber 602,
When freezing and expansion, ice crystal compression freeze protected rubber 602, so that control chip 601 will not be caused to damage.After temperature recovery, prevent
Freeze the resilience of rubber 602, so as to absorb the swelling volume of urea icing repeatedly.
A kind of control method of dual pressure sensor formula gas drive urea injection system, airline pressure sensor is in urea tank
Pressure is detected that airline pressure sensor signal is set to P5.Fluid path pressure sensor is carried out to the injection pressure of urea nozzle
Detection, fluid path pressure sensor signal is set to P6.Controller ECU to airline pressure sensor and fluid path pressure sensor by examining
The comprehensive analysis of data is surveyed, the control to urea injection system pressure can be realized and realize the diagnosis of urea nozzle working condition.
Urea injection system Stress control comprises the following steps.
Step 11, urea tank Stress control：Controller ECU is made by the control to intake valve and exhaust valve opening opportunity
Gas pressure in urea tank is maintained within the scope of Pa ~ Pb.The preferred values of Pa are 670KPa, and the preferred values of Pb are
730KPa。
Controller ECU is specific as follows to the control process of intake valve and exhaust valve opening opportunity.
After vehicle launch, controller ECU 8 gives the open signal of intake valve 3, and compressed gas is entered by source of the gas 9 through intake valve 3
Enter air pressure in urea tank 1, urea tank 1 to be measured by airline pressure sensor 5, after pressure reaches Pb controller ECU 8 control into
Air valve 3 is closed.
Reduced as shown in Fig. 2 spraying urea volume in urea, urea tank 1 with urea nozzle 7, gas volume increase, pressure
Power is reduced, and when pressure drops to Pa, controller ECU 8 controls intake valve 3 to open again, it is ensured that system pressure is stable in setting model
In enclosing.
Set urea upper pressure limit Pc, preferably 750kPa, Pc>Pb, when air pressure exceeds Pc in urea tank 1, controller
The control air bleeding valves 4 of ECU 8 are opened, to discharge air pressure in urea tank 1, when pressure is down to Pb in urea tank 1, close air bleeding valve 4.
Step 12, urea nozzle parameter is controlled：Urea is driven by air pressure and filters laggard through urea cleaner 2 in urea tank 1
Enter urea nozzle 7, ECU 8 sets urea injecting quantity according to engine calibration situation.Urea nozzle 7 is opened according to 1Hz frequency,
Controller ECU 8 is by controlling the unlatching duration T1 per second of urea nozzle 7 to control urea injecting quantity.
Step 13, urea nozzle parameter control when gas-liquid road pressure differential is abnormal：When urea nozzle is opened, urea fluid path
Pressure declines, as shown in Figure 2.Now, thus fluid path pressure sensor signal P6 be less than airline pressure sensor signal P5, gas-liquid road
Pressure differential is assumed to be Pd, and the higher limit of gas-liquid road pressure differential when Pe is urea normal injection, the preferred values of Pe are 50KPa.
Only work as Pd<During Pe, normal urea injection control could be carried out.However, when system runs one section on vehicle
Between after, due to unavoidably there is a certain amount of impurity in urea, accumulation of impurities causes urea cleaner 2 on urea cleaner 2
Resistance increases, so that Pd>Pe.
Urea injection pressure reduction is now effectively equivalent to, if opening duration control urea nozzle 7 still according to original
Unlatching, necessarily causes urea injecting quantity to reduce, urea spraying deteriorates, is thus easily caused and discharges exceeded, gas exhaust piping appearance
Urea crystals, and then cause vehicle limit to turn round powerless, the normal of influence vehicle is used.
Work as Pd>Pe, during urea abnormal injection, to ensure that vehicle is normally used, urea nozzle parameter is entered as follows
Row adjustment control, specific control method is as described below.
Step 131：Work as Pe<Pd<The preferred value of Pf, Pf be 75KPa when, namely Pd spans be 50 ~ 75KPa when, control
The injection duration T2 per second of urea nozzle is adjusted to T2=k*T1 by device ECU processed, wherein, k is injection time scale modification coefficient, k=1+
Pd/（Pa+Pb）/2.
Step 132：Work as Pf<Pd<The preferred value of Pg, Pg be 100KPa when, namely Pd spans be 75 ~ 100KPa when,
When urea nozzle injection frequency is improved to 2Hz by 1Hz, decline gas-liquid road pressure differential Pd.As shown in figure 3, the solid line in Fig. 3
Represent that the dotted line in the pressure change under 1Hz injection frequencies, Fig. 3 represents the pressure change under 2Hz injection frequencies.Work as system detectio
After recovering normal to system pressure, will urea nozzle open frequency be set as 1Hz.
Step 133：As Pd ＞ Pg, namely Pd spans, when being ＞ 100KPa, controller ECU is by the pressure of urea tank
Power scope is adjusted to（Pa+Pd/2）~（Pb+Pd/2）；Meanwhile, controller ECU alarms are, it is necessary to change urea filter
Core.
The diagnosis of urea nozzle working condition comprises the following steps.
Step 21, the fault detect of system electrical part：Vehicle electrifying startup, controller ECU is to system electrical part
Connecting and disconnecting of the circuit and resistance, which whether there is, to be detected, system electrical part includes intake valve, air bleeding valve, airline pressure sensor, fluid path
Pressure sensor and urea nozzle；Judge that system electrical part is normal if normal, be otherwise judged as the electric component event of correlation
Barrier.
Step 22, system builds pressure：After step 21 judges that system electrical component working is normal, controller ECU control air inlets
Valve, which is opened, rises urea pressure inside the tank, if airline pressure sensor signal P5 and fluid path pressure sensor signal in time T3
P6 reaches Pb, then judges that system is built and be pressed into work(；Wherein, the preferred values of T3 are 10s.
If airline pressure sensor signal P5 is not up to Pb within the T3 times, syndicate construction in a systematic way pressure failure failure, system is stopped
Only work, trouble light is bright；If P6 is not up to Pb within the T3 times, fluid path plugging fault, system stalls, trouble light are reported
It is bright.
Step 23, gas-liquid road leakage fault detect：System, which is built, to be pressed into after work(, and controller ECU closes intake valve and exhaust
Valve, monitors airline pressure sensor signal P5 and fluid path pressure sensor signal P6.
a）If airline pressure sensor signal P5 pressure drops in time T5 are less than Ph, and the preferred value of Ph≤Pg, Ph is
100KPa；Then judge that system gas circuit is working properly.
b）If airline pressure sensor signal P5 pressure drops in time T5 are more than or equal to Ph, the preferred values of T5 are 1s, then
Reporting system gas-path leakage failure, system stalls, trouble light is bright.
c）If fluid path pressure sensor signal P6 pressure drops in time T6 are less than Pi, and Pi<Pe, then judge system fluid path
It is working properly.Wherein, the preferred values of T6 are 1s, and the preferred values of Pi are 20KPa.
d）If fluid path pressure sensor signal P6 pressure drops in time T6 are more than or equal to Pi, the leakage event of reporting system fluid path
Barrier.
Step 24, urea nozzle fault detect：After judging that system fluid path and gas circuit are normal in step 23, controller
ECU controls urea nozzle to be opened once with 0.05s durations, monitors gas-liquid road pressure differential Pd, sets Pd ranges of normal value as Pj<
Pd<Pk, and Pk≤Pe, wherein, the preferred values of Pj are 15KPa, and the preferred values of Pk are 50KPa.Work as Pd<Pj, then report urea nozzle
Plugging fault, system stalls, trouble light is bright；Work as Pd>Pk, then report urea nozzle leakage failure, system stalls, failure
Lamp is bright.
After the diagnosis of above urea nozzle working condition all judges normally, system enters normal operating conditions.System is normal
It is monitored in real time still according to step 21 to step 24 in the course of work, it is ensured that system gas circuit, fluid path are unimpeded, urea nozzle spray
The amount of penetrating is normal, and urea filter core resistance is in setting range.
Preferred embodiment of the present utility model described in detail above, still, the utility model is not limited to above-mentioned reality
The detail in mode is applied, in range of the technology design of the present utility model, the technical solution of the utility model can be entered
The a variety of equivalents of row, these equivalents belong to protection domain of the present utility model.
Claims (4)
1. a kind of dual pressure sensor formula gas drive urea injection system, including urea tank, urea cleaner, source of the gas, urea nozzle
With controller ECU；Intake valve and air bleeding valve are provided with urea tank, the inlet end of intake valve is connected with source of the gas；In urea tank
It is additionally provided with airline pressure sensor；The input of urea cleaner is connected with urea tank, the output end of urea cleaner with
Urea nozzle is connected；Intake valve, air bleeding valve, airline pressure sensor and urea nozzle are connected with controller ECU；It is special
Levy and be：The fluid path pressure sensor being connected with controller ECU is provided between urea cleaner and urea nozzle；The liquid
Road pressure sensor includes control chip, sensor connector, thermally conductive sheet and electrical heating urea tube；
Sensor connector is fixedly installed in the two ends of control chip, each sensor connector and is provided with fluid course, each
The internal face of fluid course is provided with thermally conductive sheet；The periphery of each sensor connector is set with electrical heating urea tube.
2. dual pressure sensor formula gas drive urea injection system according to claim 1, it is characterised in that：The control core
Be in contact with the urea periphery of part of piece is coated with freeze protected rubber.
3. dual pressure sensor formula gas drive urea injection system according to claim 1, it is characterised in that：Each sensor
Joint uses the quick connector of SAEJ2044 standards.
4. dual pressure sensor formula gas drive urea injection system according to claim 1, it is characterised in that：Urea tank it is resistance to
Pressure energy power is more than 12bar.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720086045.4U CN206554996U (en) | 2017-01-23 | 2017-01-23 | A kind of dual pressure sensor formula gas drive urea injection system |
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| CN201720086045.4U CN206554996U (en) | 2017-01-23 | 2017-01-23 | A kind of dual pressure sensor formula gas drive urea injection system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109730929A (en) * | 2019-03-11 | 2019-05-10 | 塔尔普(北京)制药技术有限公司 | A kind of medicament nano granulation combined nozzle |
| CN115853618A (en) * | 2023-01-04 | 2023-03-28 | 长城汽车股份有限公司 | Control method and device for urea nozzle, vehicle and storage medium |
-
2017
- 2017-01-23 CN CN201720086045.4U patent/CN206554996U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109730929A (en) * | 2019-03-11 | 2019-05-10 | 塔尔普(北京)制药技术有限公司 | A kind of medicament nano granulation combined nozzle |
| CN109730929B (en) * | 2019-03-11 | 2024-05-28 | 塔尔普(北京)制药技术有限公司 | Combined spray nozzle for drug nano-granulation |
| CN115853618A (en) * | 2023-01-04 | 2023-03-28 | 长城汽车股份有限公司 | Control method and device for urea nozzle, vehicle and storage medium |
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