CN107120164A - The method for diagnosing faults and device of the injector of vehicle SCR systems - Google Patents
The method for diagnosing faults and device of the injector of vehicle SCR systems Download PDFInfo
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- CN107120164A CN107120164A CN201610099933.XA CN201610099933A CN107120164A CN 107120164 A CN107120164 A CN 107120164A CN 201610099933 A CN201610099933 A CN 201610099933A CN 107120164 A CN107120164 A CN 107120164A
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- injector
- reducing agent
- pressure
- pump
- ecu
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 83
- 238000003860 storage Methods 0.000 claims abstract description 30
- 238000002347 injection Methods 0.000 claims abstract description 23
- 239000007924 injection Substances 0.000 claims abstract description 23
- 238000005259 measurement Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 230000015556 catabolic process Effects 0.000 abstract description 3
- 239000007921 spray Substances 0.000 description 9
- 238000006722 reduction reaction Methods 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000013589 supplement Substances 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000002405 diagnostic procedure Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
Classifications
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- 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
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/05—Systems for adding substances into exhaust
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The present invention relates to a kind of method of the injector breakdown judge to vehicle SCR systems, SCR system includes reducing agent storage tank, injector, the pressure pump in the connecting line between reducing agent storage tank and injector and the ECU for controlling injector and pressure pump, pressure pump includes being used for that selectivity pressurizes reducing agent supplied to the pump of injector from reducing agent storage tank and the time interval of response time for being more than the pump with one constantly detects the pressure sensor of pump discharge pressure, and method comprises the following steps：SQ：Start the fault detect to injector；S22：Injector is instructed with least the 30% of the maximum injection quantity emitted dose for changing reducing agent；S23：If the absolute value of the outlet pressure change detected by the pressure sensor is more than a predetermined pressure threshold, assert that injector breaks down；Otherwise, assert that injector is working properly.The invention further relates to perform the vehicle SCR systems of this method.
Description
Technical field
The present invention relates to the spray in vehicle, the especially selective catalytic reduction system operating of exhaust gas from diesel vehicle
The method for diagnosing faults and device of emitter.
Background technology
Currently for the energy in terms of consideration, increasing vehicle is equipped with diesel engine and is used as power
Source.In order to meet increasingly strict exhaust emission standard, this vehicle would generally be equipped with selectivity
Catalysis reduction (SCR) system.
SCR system mainly include being used for the storage tank for storing reducing agent (be usually urea) and
For by reducing agent from storage tank be ejected into blast duct for vehicle according to need in injector.This spray
Emitter causes the selective break-make of spout generally by the body provided with spout, in the body
Valve element and valve element is activated magnet coil composition.
The timely break-make of the spout of injector is for ensuring that appropriate reducing agent is ejected into blast pipe
It is very crucial.In some current vehicles, only by real-time measurement SCR system spray
The electric current of the magnet coil of emitter confirms whether injector is working properly.But, only measure electricity
A kind of this measure of the electric current of magnetic coil definitely can not reliably confirm SCR system injector whether
In normal operating conditions.If there is erroneous judgement, cause to be ejected into the reduction in blast pipe
If underdosage or no reducing agent injection, it will cause the nitride of Vehicular exhaust exceeded,
Violate Abgasgesetz or even can threaten the healthy of automotive occupant when serious.
In addition, above-mentioned current measurement requires that SCR system is equipped with the ECU of more top price
(ECU) it could realize.But sometimes, for improving enterprise competitiveness and cost-effective examine
Consider, it is necessary to be equipped with the ECU of low and middle-end price for SCR system.The ECU of this low and middle-end price
Without the ability and configuration for reading and handling this current measurement signal, therefore it can not realize
The diagnostic measurement of the injector of SCR system.
Therefore, in the urgent need to developing a kind of supplement to existing measurement solenoid current measure
And/or alternative technologies scheme.
The content of the invention
Based on above mentioned problem, the present invention proposes a kind of injector of improved vehicle SCR systems
Method for diagnosing faults and device, can be to the favourable of the method for diagnosing faults of existing injector
Substitute or supplement.
According to an aspect of the invention, there is provided a kind of injector event to vehicle SCR systems
Hinder the method judged, the SCR system includes reducing agent storage tank, injector, positioned at described
The pressure pump in connecting line, Yi Jiyong between reducing agent storage tank and the injector
In the ECU for controlling the injector and the pressure pump, the pressure pump includes using
In selectivity by reducing agent from the reducing agent storage tank pressurize supplied to the injector pump with
And the time interval of the response time for being more than the pump with one constantly detects the pump discharge
The pressure sensor of pressure, the described method comprises the following steps：
SQ：Start the fault detect to the injector；
S22：The injector is instructed with least the 30% of the maximum injection quantity injection for changing reducing agent
Amount；
S23：If the absolute value of the outlet pressure change detected by the pressure sensor is more than
One predetermined pressure threshold, then assert that the injector breaks down；Otherwise, the spray is assert
Emitter is working properly.
Alternatively, before the step S22, following steps are performed：
S21：The injector is instructed to be stopped a predetermined downtime.
Alternatively, before step SQ, following steps are performed：
S11：Before being subtracted by this reducing agent jeting instruction amount for sending the injector once
Reducing agent jeting instruction amount determines reducing agent jeting instruction amount difference；
S12：The reducing agent pressure of one-shot measurement before by the way that this reducing agent pressure value measured is subtracted
Force value come determine reducing agent pressure value measure difference；
S13：The reducing agent jeting instruction amount difference and the reducing agent pressure value are measured into difference
It is multiplied, when multiplied result is more than zero, performs step SQ；Otherwise, the injector work is assert
Make normal.
Alternatively, only when the absolute value of the step S11 reducing agent jeting instruction amount differences determined is big
In one than maximum injection quantity 30% small threshold value when and/or when step S12 determine reducing agent pressure
When the absolute value of force measurement difference is more than a value smaller than the predetermined pressure threshold, just hold
Row step S13.
Alternatively, when step S13 multiplied result is less than zero, one first counter O reset,
And assert that the injector is working properly；
When step S13 multiplied result is more than zero, first rolling counters forward once, such as should
The stored count value of first counter is more than 1 predetermined value not less than one, then returns to step S11
With step S12；Otherwise, step SQ is performed.
Alternatively, only when the absolute value of the step S11 reducing agent jeting instruction amount differences determined is big
When the 5%~10% of maximum injection quantity, step S13 is just performed.
Alternatively, the step SQ is performed every a predetermined time section, when described predetermined
Between section be, for example, 30 minutes, 45 minutes, 60 minutes etc..
Alternatively, it is not more than predetermined pressure in the absolute value of the step S23 outlet pressures detected
During force threshold, one second counter clear simultaneously assert that the injector is working properly；
When the absolute value of the step S23 outlet pressures detected is more than predetermined pressure threshold,
Second rolling counters forward once, if the stored count value of second counter is big not less than one
In 1 predetermined value, then step S21 and step S22 are returned to；Otherwise, the injection is assert
Device breaks down.
Alternatively, methods described also includes：
Detect the electric current of the magnet coil of the injector；
It is not inconsistent in the current waveform of the detection with defined current waveform, assert the injector
Break down；Otherwise, assert that the injector is working properly.
According to another aspect of the present invention there is provided a kind of vehicle SCR systems, it is included also
Former agent storage tank, injector, the company between the reducing agent storage tank and the injector
Take over road in pressure pump and for controlling the injector and the pressure pump
ECU, the pressure pump include be used for selectivity reducing agent is stored from the reducing agent
Response time of the tank pressurization supplied to the pump of the injector and for being more than the pump with one
Time interval constantly detects the pressure sensor of the pump discharge pressure, and the ECU only has
The ability of pressure detecting signal can be received from the pressure sensor, and the ECU is performed
The above method.
According to another aspect of the present invention there is provided a kind of vehicle SCR systems, it is included also
Former agent storage tank, injector, the company between the reducing agent storage tank and the injector
Take over road in pressure pump and for controlling the injector and the pressure pump
ECU, the pressure pump include be used for selectivity reducing agent is stored from the reducing agent
Response time of the tank pressurization supplied to the pump of the injector and for being more than the pump with one
Time interval constantly detects the pressure sensor of the pump discharge pressure, and the injector includes
Magnet coil for realizing reducing agent injection, the ECU has can be from the pressure sensing
Device receives the port of pressure detecting signal and can receive the detection electric current of the magnet coil
Port, and the ECU performs the above method.
Using the above-mentioned technological means of the present invention, manufactured for the ECU using low and middle-end price
For SCR system, only just whether injector can interpolate that using pump discharge pressure as evaluation basis
It is working properly, while SCR system functional reliability is ensured, reduce manufacturing cost.Separately
Outside, in the SCR system using the ECU of top price, it would however also be possible to employ skill of the invention
Art means, the failure for evaluating basis is used as to the detection electric current using the magnet coil of injector
The favourable supplement of determination methods, reduces False Rate, improves reliability.
Brief description of the drawings
Describe in detail from described later and combine following accompanying drawing and will can be more fully understood the present invention's
Foregoing and other side.It is pointed out that the ratio of each accompanying drawing is for clarity of illustration
It is possible to different, but this can't influence the understanding of the present invention.In the accompanying drawings：
Fig. 1 is system schematic, diagrammatically illustrates to perform and is examined according to the injector failure of the present invention
The block diagram of one embodiment of the SCR system of disconnected method；
Fig. 2 is flow chart, diagrammatically illustrates the injector method for diagnosing faults according to the present invention
One embodiment；
Fig. 3 is flow chart, diagrammatically illustrates anticipation step in method as shown in Figure 1
One embodiment；
Fig. 4 is flow chart, diagrammatically illustrates detecting step in method as shown in Figure 1
One embodiment；And
Fig. 5 is system schematic, diagrammatically illustrates to perform and is examined according to the injector failure of the present invention
The block diagram of another embodiment of the SCR system of disconnected method.
Embodiment
In each accompanying drawing of the application, structure is identical or intimate feature is by identical accompanying drawing
Mark is represented.
Fig. 1 diagrammatically illustrates a vehicle SCR systems sketch.The SCR system is generally wrapped
Include ECU (ECU), for store such as urea reducing agent storage tank 100, be used for
The injector 300 that injects a reductant into blast duct for vehicle 400 and in the storage tank
The pressure pump 200 connected between 100 and injector 300.Pressure pump 200 is in ECU
Control under according to need by a certain amount of reducing agent through pipeline from storage tank 100 pressurization be fed to
In injector 300.
Injector 300 include the body provided with spout, cause the valve element of the selective break-make of spout with
And the magnet coil activated to valve element.ECU via electricity from circuit L31 to injector 300
Magnetic coil sends the instruction of actuating valve element.
Pressure pump 200 mainly including pump 210 and pump 210 outlet downstream set
Pressure sensor 220.Pressure sensor 220 was used for the time of a response time for being more than pump
Interval is constantly detected exports the pressure value pumped out by pump 210.It is pointed out that in this Shen
In context please, the response time of pump refers to receiving gear-shift command to its outlet pressure from pump
Power produces the time of change.The pressure value detected makes a decision via circuit L2 supplies ECU.
ECU judges whether the reducing agent pressure pumped out meets requirement according to the pressure value that is detected, and according to
This can be according to circuit L1 again to pump 210 power output be accordingly adjusted, for example adjust pump
210 pump speed.The port of this pressure value that can receive detection can be used in SCR system
High-, middle- and low-end price ECU in have configuration.
Fig. 2 diagrammatically illustrates the SCR system suitable for being equipped with the ECU for only having pressure port
According to the present invention fault judgment method one embodiment flow chart.
As shown in Fig. 2 being included according to the fault judgment method of the injector of the present invention：
S00：SCR system is started shooting；
S10：Judge whether that startup separator detects (anticipation step)；
SQ：Startup separator is detected；
S20：Carry out fault detect (detecting step)；
S30：System is normally run；And
S40：System alarm.
It is pointed out that the present invention fault judgment method can SCR system ECU
Internal such as instruction code programming in any suitable manner is performed.
Generally, after SCR system operation, ECU can be according to needs constantly via circuit L31
The instruction of injection reducing agent is sent to injector 300, for example, increaseds or decreases emitted dose.In warp
While sending instruction by circuit L31, ECU also can send out corresponding instruction via circuit L1
Give pump 210 so that pump 210 accordingly increases and decreases liquid injection pressure.
Fig. 3 shows the stream of an embodiment corresponding with the anticipation step S10 shown in Fig. 2
Cheng Tu.
First, in step S11, ECU determines the preceding reducing agent sent to injector 300
Reducing agent jeting instruction amount difference between jeting instruction amount and this reducing agent jeting instruction amount
Δ S31 (for example, the latter subtracts the former, is shown in Fig. 1).In the context of the present invention, reducing agent
Jeting instruction amount refers to making it to spray the amount of reducing agent received by injector 300.
ECU receives the outlet of the pump 210 detected by pressure sensor 220 through its pressure port
Reducing agent pressure value.In step S12, the reducing agent pressure value of one-shot measurement before ECU is determined
Difference DELTA S2 (for example, the latter subtracts the former) between the reducing agent pressure value of this measurement.
In order to reduce ECU work load, reduce its energy consumption and improve its service life, in step
In rapid S11, it can be provided only when difference DELTA S31 absolute value is more than a threshold value (for example, spray
During the 5% of the maximum injection quantity of emitter 300~10%), next step is just carried out.Alternatively, exist
In step S12, it can also be arranged to only when Δ S2 absolute value is more than a threshold value, just carry out
Next step.
Then, in step S13, the reducing agent jeting instruction amount difference DELTA S31 that step S11 is determined
It is compared with the difference DELTA S2 of the step S12 reducing agent pressure values determined, it is determined that the two changes
Trend judges whether injector 300 blocks.Generally when injector 300 works, in injection
Certain pressure can be always maintained in fluid line between device 300 and pump 210.In addition, ECU
Send after instruction, the response time of injector 300 will be faster than the response time of pump 210, therefore
By setting the decision logic responded to the two, it may be determined that whether injector 300 blocks.Example
Such as, in the case where injector 300 is commanded increase reducing agent emitted dose, in injector 300
During actual normal work, difference DELTA S31 be on the occasion of but difference DELTA S2 is negative value, then the two product
Less than zero, show that injector 300 is this time working properly, step S13 output results are "No"；
When the real work of injector 300 is blocked, difference DELTA S31 is on the occasion of but being blocked by injector
Influence, difference DELTA S2 can be accordingly on the occasion of then the two product is more than zero, shows injector 300
Choking phenomenon is presently, there are, step S13 output results are "Yes".For another example in injector
In the case that 300 are commanded reduction reducing agent emitted dose, in the actual normal work of injector 300
When, difference DELTA S31 is negative value but difference DELTA S2 is on the occasion of then the two product is less than zero, shows
Injector 300 is this time working properly, and step S13 output results are "No"；In injector 300
When real work is blocked, difference DELTA S31 is negative value, but by injector occlusive effects, difference DELTA S2
Can be accordingly negative value, then the two product is more than zero, shows that injector 300 presently, there are obstruction existing
As step S13 output results are "Yes".Above judgment mode is merely illustrative, those skilled in the art
Other similar judgment modes can be used.
In order to avoid frequently entering startup separator detecting step SQ and thus entering back into detecting step
S20, for anticipation step S10, when step S13 output results are "No", in step
Rapid S14, a counter clear and goes to step S30.When step S13 output result is "Yes"
When, add 1 in step S15 counters.Then, judge whether counter is more than in step S16
One predetermined value (for example, 5,10 or any other suitable numeral).When counter is less than
Or during equal to predetermined value, step S11 and S12 are returned to from step S16.Only counter is more than
During predetermined value, assert that injector 300 there may exist failure at present, redirected from step S16
To step S20, into startup separator detecting step SQ, detecting step S20 is then carried out.
As shown in figure 4, for formal fault detect S20, in the step s 21, ECU is first
The injector 300 of instruction SCR system is stopped a period, such as 1 second.Then, exist
Step S22, ECU instruct injector 300 with least the 30% of maximum injection quantity via circuit L31
Reducing agent is sprayed, i.e., now difference DELTA S31 is 30% or more of maximum injection quantity.Due to SCR
System has been stopped in step S21, so being surveyed in step S23 pressure sensors 220
The reducing agent pressure of amount is that pressure difference value Δ S2 is negative value.ECU judges the difference in step S23
Whether the absolute value for being worth Δ S2 is more than a predetermined pressure threshold.If in step S23 judgement
As a result it is not more than predetermined pressure threshold for "No", i.e. difference DELTA S2 absolute value, then goes to step
Rapid S24, exports the instruction of the normal work of injector 300, and therefore goes to step S30, ECU
Instruction SCR system normally works on.If being "Yes" in step S23 judged result,
I.e. difference DELTA S2 absolute value is more than predetermined pressure threshold, then goes to step S25, output spray
The instruction that emitter 300 is blocked, and therefore go to step S40.SCR is made in step S40, ECU
System-down, and send alarm to car running computer.Car running computer, can be with after alarm is received
Engine power is correspondingly reduced, exhaust emissions is reduced, and given a warning to driver, is reminded
The current SCR system of driver breaks down, and is overhauled.
Those skilled in the art are also apparent that in an alternative embodiment, for failure
S20 is detected, step S21 can also be omitted.In this case, in step S22 direct instructions
Injector 300 is with least the 30% of the maximum injection quantity emitted dose for increasing reducing agent or reduces reduction
The emitted dose of agent.Then, difference DELTA S2 is determined in step S23, if difference DELTA S2's is absolute
Value is more than predetermined pressure threshold, then goes to step S25, the finger that output injector 300 is blocked
Order, and therefore go to step S40；If difference DELTA S2 absolute value is not more than predetermined pressure
Threshold value, then go to step S24, exports the instruction of the normal work of injector 300, and therefore turns
To step S30, ECU instruction SCR systems normally work on.
Those skilled in the art are also apparent that anticipation step S10 can also alternatively be used
The mode of timer is realized.For example, in the timer of ECU inner settings one, the timer with
Any suitable time intervals such as half an hour, 1 hour (influence ECU infrequently to trigger
The time of performance is preferred) enter startup separator detecting step SQ.
Alternatively, during formal fault detect S20, in step S23 and step S25
Between, the counter used such as step S14 to S16 can also be set, so as to only work as counting
Device is more than certain value, i.e., when step S23 difference DELTA S2 absolute value is multiple and is continuously more than
During predetermined pressure threshold, just assert that injector 300 blocks.
Those skilled in the art are also apparent that and can directly omitted in an embodiment of the present invention
Anticipation step S10, and startup separator detecting step SQ is directly entered, then ECU instructs SCR
System is detected with scheme relevant on fault detect S20 as mentioned above.
Therefore, according to a preferred embodiment of the invention, the invention provides a kind of to vehicle SCR
The method of the injector breakdown judge of system, the SCR system includes reducing agent storage tank, spray
Pressurization in emitter, the connecting line between the reducing agent storage tank and the injector
Pump installation and the ECU for controlling the injector and the pressure pump, it is described to add
Press pump device includes reducing agent is supplied into institute from reducing agent storage tank pressurization for selectivity
State injector pump and for one be more than the pump response time time interval constantly
The pressure sensor of the pump discharge pressure is detected, be the described method comprises the following steps：
SQ：Start the fault detect to the injector；
S22：The injector is instructed with least the 30% of the maximum injection quantity injection for changing reducing agent
Amount；
S23：If the absolute value of the outlet pressure change detected by the pressure sensor is more than
One predetermined pressure threshold, then assert that the injector breaks down；Otherwise, the spray is assert
Emitter is working properly.
The present invention therefore additionally provide a kind of vehicle SCR systems, it include reducing agent storage tank,
Adding in injector, the connecting line between the reducing agent storage tank and the injector
Press pump device and the ECU for controlling the injector and the pressure pump, it is described
Pressure pump includes being supplied to reducing agent from reducing agent storage tank pressurization for selectivity
The pump of the injector and for one be more than the pump response time time interval it is continuous
Ground detects the pressure sensor of the pump discharge pressure, and the injector includes being used to realize reduction
The magnet coil of agent injection, the ECU has can receive pressure inspection from the pressure sensor
Survey the port of signal and/or the port of the detection electric current of the magnet coil can be received, and institute
State ECU and perform the above method.
Using the above-mentioned technological means of the present invention, SCR system is without being equipped with ECU costly
The fault detect of injector 300 can be just realized, is increasing the operational reliability of SCR system
Meanwhile, significantly reduce SCR manufacturing cost.
The present invention above-mentioned fault detection method can also be equipped with top price ECU SCR
Used in system.For example, Fig. 5 is diagrammatically illustrated using the injector failure according to the present invention
The block diagram of another embodiment of the SCR system of diagnostic method.
SCR system shown in SCR system and Fig. 1 shown in Fig. 5 only difference is that,
ECU is the ECU of top price, and its interface can be connected via circuit L32 with injector 300,
Detection electric current for the magnet coil of real-time reception injector 300.Based on acquired detection
Current waveform, ECU can interpolate that out whether injector 300 blocks, if for example detected
Current waveform is not inconsistent with defined current waveform, then assert and block.At the same time, the SCR systems
The ECU of system can also perform the pump pressure detected based on pressure sensor 220 of the invention described above
Fault detection method.That is, using the fault detect side based on electric current and pressure simultaneously
Method, further ensure that the accuracy rate of the breakdown judge of SCR system, it is to avoid existing SCR
System only carries out fault detect by electric current and the phenomenon failed to judge occurs.
Although only certain exemplary embodiments of this invention is described in detail here, they are used for the purpose of
The purpose of explanation and provide, and it is not considered that they are construed as limiting to the scope of the present invention.
Without departing from the spirit and scope, it is various to replace, change and transform and be contemplated
Out.
Claims (11)
1. a kind of fault judgment method of the injector of vehicle SCR systems, the SCR system
Including reducing agent storage tank (100), injector (300), positioned at the reducing agent storage tank (100)
Pressure pump (200), Yi Jiyong in connecting line between the injector (300)
It is described to add in the ECU for controlling the injector (300) and the pressure pump (200)
Press pump device (200) includes being used for selectivity by reducing agent from the reducing agent storage tank (100)
Pressurization is supplied to the pump (210) of the injector (300) and for being more than the pump with one
The time interval of response time constantly detect the pressure sensing of the pump (210) outlet pressure
Device (220), the described method comprises the following steps：
SQ：Start the fault detect to the injector (300)；
S22：Instruct the injector (300) with least the 30% of maximum injection quantity to change to reduce
The emitted dose of agent；
S23：If the outlet pressure change detected by the pressure sensor (220) is exhausted
One predetermined pressure threshold is more than to value, then assert that the injector (300) breaks down；It is no
Then, assert that the injector (300) is working properly.
2. according to the method described in claim 1, it is characterised in that the step S22 it
Before, perform following steps：
S21：The injector (300) is instructed to be stopped a predetermined downtime.
3. method according to claim 1 or 2, it is characterised in that step SQ it
Before, perform following steps：
S11：Before being subtracted by this reducing agent jeting instruction amount for sending the injector once
Reducing agent jeting instruction amount determines reducing agent jeting instruction amount difference (Δ S31)；
S12：The reducing agent pressure of one-shot measurement before by the way that this reducing agent pressure value measured is subtracted
Force value come determine reducing agent pressure value measure difference (Δ S2)；
S13：By the reducing agent jeting instruction amount difference (Δ S31) and the reducing agent pressure
Value measurement difference (Δ S2) is multiplied, and when multiplied result is more than zero, performs step SQ；Otherwise,
Assert that the injector (300) is working properly.
4. method according to claim 3, it is characterised in that only when step S11 is determined
The absolute value of reducing agent jeting instruction amount difference (Δ S31) be more than one than the 30% of maximum injection quantity
During small threshold value and/or when the step S12 reducing agent pressure value measurement differences (Δ S2) determined
When absolute value is more than a value smaller than the predetermined pressure threshold, step S13 is just performed.
5. the method according to claim 3 or 4, it is characterised in that step S13's
When multiplied result is less than zero, one first counter O reset, and assert the injector (300) work
Make normal；
When step S13 multiplied result is more than zero, first rolling counters forward once, such as should
The stored count value of first counter is more than 1 predetermined value not less than one, then returns to step S11
With step S12；Otherwise, step SQ is performed.
6. the method according to claim 4 or 5, it is characterised in that only as step S11
The absolute value of the reducing agent jeting instruction amount difference (Δ S31) of determination is more than maximum injection quantity
When 5%~10%, step S13 is just performed.
7. method according to claim 1 or 2, it is characterised in that predetermined every one
Period performs the step SQ, the predetermined time period is, for example, 30 minutes, 45 minutes,
60 minutes etc..
8. according to any described method of claim 1 to 7, it is characterised in that in step
When the absolute value for the outlet pressure that S23 is detected is not more than predetermined pressure threshold, one second meter
Number device is zeroed and assert that the injector (300) is working properly；
When the absolute value of the step S23 outlet pressures detected is more than predetermined pressure threshold,
Second rolling counters forward once, if the stored count value of second counter is big not less than one
In 1 predetermined value, then step S21 and step S22 are returned to；Otherwise, the injection is assert
Device (300) breaks down.
9. according to any described method of claim 1 to 8, it is characterised in that also include：
Detect the electric current of the magnet coil of the injector (300)；
It is not inconsistent in the current waveform of the detection with defined current waveform, assert the injector
(300) break down；Otherwise, assert that the injector (300) is working properly.
10. a kind of vehicle SCR systems, it include reducing agent storage tank (100), injector (300),
Connecting line between the reducing agent storage tank (100) and the injector (300)
In pressure pump (200) and for controlling the injector (300) and the pressurization
The ECU of pump installation (200), the pressure pump (200) includes being used for selectivity by also
Former agent is pressurizeed supplied to the pump of the injector (300) from the reducing agent storage tank (100)
(210) time interval of the response time and for being more than the pump with one constantly detects institute
State the pressure sensor (220) of pump (210) outlet pressure, the ECU only has can be from
The pressure sensor (220) receives the port of pressure detecting signal, and the ECU is held
Row is according to any described method of claim 1 to 8.
11. a kind of vehicle SCR systems, it include reducing agent storage tank (100), injector (300),
Connecting line between the reducing agent storage tank (100) and the injector (300)
In pressure pump (200) and for controlling the injector (300) and the pressurization
The ECU of pump installation (200), the pressure pump (200) includes being used for selectivity by also
Former agent is pressurizeed supplied to the pump of the injector (300) from the reducing agent storage tank (100)
(210) time interval of the response time and for being more than the pump with one constantly detects institute
The pressure sensor (220) of pump (210) outlet pressure is stated, the injector (300) includes
Magnet coil for realizing reducing agent injection, the ECU has can be from the pressure sensing
Device (220) receives the port of pressure detecting signal and can receive the detection of the magnet coil
The port of electric current, and the ECU performs the method according to claim 1 to 9 is any.
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| CN109838289A (en) * | 2017-11-27 | 2019-06-04 | 罗伯特·博世有限公司 | The pumpback process monitoring system and method for aqueous solution of urea spraying system |
| CN109869217A (en) * | 2017-12-05 | 2019-06-11 | 罗伯特·博世有限公司 | Nozzle blockage diagnostic system and method for aqueous solution of urea spraying system |
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| CN113009903A (en) * | 2021-02-22 | 2021-06-22 | 一汽解放汽车有限公司 | Fault diagnosis method and device, vehicle and storage medium |
| WO2021213093A1 (en) * | 2020-09-10 | 2021-10-28 | 上海星融汽车科技有限公司 | Fault diagnosis method for scr urea injection apparatus |
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