CN110132381A - Venturi differential pressure pickup credibility diagnostic method and device - Google Patents
Venturi differential pressure pickup credibility diagnostic method and device Download PDFInfo
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- CN110132381A CN110132381A CN201910581015.4A CN201910581015A CN110132381A CN 110132381 A CN110132381 A CN 110132381A CN 201910581015 A CN201910581015 A CN 201910581015A CN 110132381 A CN110132381 A CN 110132381A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
Abstract
Static pressure difference at venturi differential pressure pickup credibility diagnostic method and device provided by the invention, the first inlet temperature of acquisition Venturi tube, the shutdown duration of engine and venturi tube inlet and between aditus laryngis；Then when static pressure difference is not less than default static pressure difference threshold value; when i.e. characterization venturi differential pressure pickup breaks down; first pass through whether determining inlet temperature is less than default inlet temperature threshold value; and shut down whether duration is greater than default shutdown duration, to determine whether the diaphragm of venturi differential pressure pickup meets ice-formation condition；When determining that venturi differential pressure pickup diaphragm meets ice-formation condition, it needs to prevent failure from quoting according to preset strategy, and venturi differential pressure pickup can't directly be prompted to break down, so as to effectively evade fault misdescription of venturi differential pressure pickup under the conditions of Han Qu, the accuracy and reasonability of venturi differential pressure pickup credibility diagnostic result are improved.
Description
Technical field
The present invention relates to vehicular engine EGR (Exhaust Gas Recirculation, exhaust gas recycling) systems technologies
Field, more specifically, being related to venturi differential pressure pickup credibility diagnostic method and device.
Background technique
Vehicular engine can reduce the discharge amount of nitrogen oxides (NOx) using egr system, wherein pass through venturi pressure
Gap sensor measurement flows through the exhaust air mass flow of EGR valve, can be realized the closed-loop control of gas handling system.
In prior art, after vehicular engine ECU is powered on, when the measured value of venturi differential pressure pickup is beyond conjunction
When managing range, the incredible error code of venturi differential pressure pickup will be directly quoted.But under cold regions, venturi
The diaphragm of differential pressure pickup is easy to freeze, and diaphragm freeze after meeting so that the measured value of venturi differential pressure pickup beyond reasonable model
It encloses, breaks down so as to cause Chinese herbaceous peony wrong report venturi differential pressure pickup is played, or even light MIL malfunction indicator lamp, and then influence
User experience.
Therefore, a kind of effective venturi differential pressure pickup credibility diagnosis scheme is needed, at present to evade literary mound
In fault misdescription of the differential pressure pickup under cold regions, improve venturi differential pressure pickup credibility diagnosis accuracy and conjunction
Rationality.
Summary of the invention
In view of this, the present invention provides a kind of venturi differential pressure pickup credibility diagnostic method and device, to solve
Prior art can report venturi differential pressure pickup by mistake under cold regions and break down, and cause venturi differential pressure pickup can
The accuracy and the poor technical problem of reasonability of letter property diagnosis.
To achieve the above object, the invention provides the following technical scheme:
A kind of venturi differential pressure pickup credibility diagnostic method, which comprises
It obtains at the inlet temperature of Venturi tube, the shutdown duration of engine and venturi tube inlet and at aditus laryngis
Between static pressure difference；
Determine whether the static pressure difference is less than default static pressure difference threshold value；
When the static pressure difference is not less than the default static pressure difference threshold value, it is pre- to determine whether the inlet temperature is less than
If inlet temperature threshold value, and whether the shutdown duration is greater than default shutdown duration；Wherein, the static pressure difference is not less than described
Default static pressure difference threshold value, characterization venturi differential pressure pickup break down；
When the inlet temperature be less than the default inlet temperature threshold value, and the shutdowns duration be greater than it is described preset stop
When machine duration, failure is prevented to quote according to preset strategy；Wherein, the inlet temperature is less than the default inlet temperature threshold
Value, and the shutdown duration is greater than the default shutdown duration, the diaphragm for characterizing the venturi differential pressure pickup, which meets, to freeze
The condition and static pressure difference is insincere.
Preferably, whether it is less than default inlet temperature threshold value in the determination inlet temperature, and when the shutdown
It is long whether to be greater than after default shutdown duration, the method also includes:
When the inlet temperature is not less than the default inlet temperature threshold value, alternatively, the shutdown duration is not more than institute
When stating default shutdown duration, executes failure and quote, to prompt the venturi differential pressure pickup to break down；
Wherein, the inlet temperature is not less than the default inlet temperature threshold value, alternatively, the shutdown duration is not more than
The default shutdown duration, the diaphragm for characterizing the venturi differential pressure pickup does not meet ice-formation condition and the static pressure difference can
Letter.
Preferably, whether it is less than default inlet temperature threshold value in the determination inlet temperature, and when the shutdown
It is long whether to be greater than before default shutdown duration, the method also includes:
Obtain the default shutdown duration corresponding with the inlet temperature；
Wherein, different inlet temperature corresponds to different default shutdown durations.
Preferably, described quote according to preset strategy prevention failure includes:
Postpone default waiting time, then re-executes the inlet temperature for obtaining Venturi tube, engine stops
The step of static pressure difference at machine duration and venturi tube inlet and between aditus laryngis.
Preferably, before the delay default waiting time, the method also includes:
It obtains engine water temperature value and exhaust gas recycles EGR valve opening value；
Obtain the default waiting time corresponding with the engine water temperature value and EGR valve opening value；
Wherein, different engine water temperature value and different EGR valve opening values, correspond to different default waiting times.
A kind of venturi differential pressure pickup credibility diagnostic device, described device include:
Relevant parameter acquiring unit, for obtaining the inlet temperature of Venturi tube, the shutdown duration of engine, Yi Jiwen
Static pressure difference between venturi inlet and aditus laryngis；
Static pressure difference diagnosis unit, for determining whether the static pressure difference is less than default static pressure difference threshold value；
Ice-formation condition diagnosis unit, for determining institute when the static pressure difference is not less than the default static pressure difference threshold value
State whether inlet temperature is less than default inlet temperature threshold value, and whether the shutdown duration is greater than default shutdown duration；Wherein,
The static pressure difference is not less than the default static pressure difference threshold value, and characterization venturi differential pressure pickup breaks down；
Fault condition processing unit, for being less than the default inlet temperature threshold value when the inlet temperature, and it is described
When shutting down duration greater than the default shutdown duration, failure is prevented to quote according to preset strategy；Wherein, the inlet temperature is small
In the default inlet temperature threshold value, and the shutdown duration is greater than the default shutdown duration, characterizes the venturi pressure difference
The diaphragm of sensor meets ice-formation condition and the static pressure difference is insincere.
Preferably, the fault condition processing unit is also used to:
Whether it is less than default inlet temperature threshold value in the determination inlet temperature, and whether the shutdown duration is big
After default shutdown duration, when the inlet temperature is not less than the default inlet temperature threshold value, alternatively, when the shutdown
It fails to grow up when the default shutdown duration, executes failure and quote, to prompt the venturi differential pressure pickup to break down；
Wherein, the inlet temperature is not less than the default inlet temperature threshold value, alternatively, the shutdown duration is not more than
The default shutdown duration, the diaphragm for characterizing the venturi differential pressure pickup does not meet ice-formation condition and the static pressure difference can
Letter.
Preferably, described device further include:
Threshold condition acquiring unit, for whether being less than default inlet temperature threshold in the determination inlet temperature
Value, and whether the shutdown duration is greater than before default shutdown duration, obtains corresponding with the inlet temperature described pre-
If shutting down duration；
Wherein, different inlet temperature corresponds to different default shutdown durations.
Preferably, the fault condition processing unit is specifically used for:
When the inlet temperature be less than the default inlet temperature threshold value, and the shutdowns duration be greater than it is described preset stop
When machine duration, postpones default waiting time, then trigger the relevant parameter acquiring unit and re-execute the acquisition venturi
The step of static pressure difference at the inlet temperature of pipe, the shutdown duration of engine and venturi tube inlet and between aditus laryngis
Suddenly.
Preferably, described device further include:
Waiting time acquiring unit, for obtaining before the fault condition processing unit postpones default waiting time
Engine water temperature value and exhaust gas recycle EGR valve opening value, and obtain and the engine water temperature value and EGR valve opening value phase
The corresponding default waiting time；
Wherein, different engine water temperature value and different EGR valve opening values, correspond to different default waiting times.
It can be seen from the above technical scheme that venturi differential pressure pickup credibility diagnostic method provided by the invention and
Device, first obtain at the inlet temperature of Venturi tube, the shutdown duration of engine and venturi tube inlet at aditus laryngis it
Between static pressure difference；Then it is not less than default static pressure difference threshold value in static pressure difference, i.e. event occurs for characterization venturi differential pressure pickup
When barrier, when whether being greater than default shut down by determining whether inlet temperature is less than default inlet temperature threshold value, and shutting down duration
It is long, to determine whether the diaphragm of venturi differential pressure pickup meets ice-formation condition；And determining venturi differential pressure pickup diaphragm
It when meeting ice-formation condition, prevents failure from quoting according to preset strategy, and is not to execute failure to quote, so as to effectively evade
Fault misdescription of venturi differential pressure pickup under the conditions of Han Qu improves the standard of venturi differential pressure pickup credibility diagnostic result
True property and reasonability.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of flow chart of venturi differential pressure pickup credibility diagnostic method provided in an embodiment of the present invention；
Fig. 2 is the schematic diagram of venturi differential pressure pickup provided in an embodiment of the present invention；
Fig. 3 is another flow chart of venturi differential pressure pickup credibility diagnostic method provided in an embodiment of the present invention；
Fig. 4 is another flow chart of venturi differential pressure pickup credibility diagnostic method provided in an embodiment of the present invention；
Fig. 5 is the schematic diagram of venturi differential pressure pickup credibility diagnostic logic process provided in an embodiment of the present invention；
Fig. 6 is a kind of structural representation of venturi differential pressure pickup credibility diagnostic device provided in an embodiment of the present invention
Figure；
Fig. 7 is another structural representation of venturi differential pressure pickup credibility diagnostic device provided in an embodiment of the present invention
Figure.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Venturi differential pressure pickup credibility diagnostic method and device provided by the invention can be applied to EGR
The engine of (Exhaust Gas Recirculation, exhaust gas recycling) system.Venturi differential pressure pickup credibility is examined
It is disconnected, it is in fact exactly whether venturi differential pressure pickup really to have occurred failure and whether its measurement result is credible examines
It is disconnected.
Referring to Fig. 1, Fig. 1 is one kind of venturi differential pressure pickup credibility diagnostic method provided in an embodiment of the present invention
Flow chart.
As shown in Figure 1, the venturi differential pressure pickup credibility diagnostic method of the present embodiment can include:
S110: obtaining at the inlet temperature of Venturi tube, the shutdown duration of engine and venturi tube inlet and larynx
Static pressure difference between mouthful.
Venturi differential pressure pickup includes Venturi tube, and Venturi tube includes at its inlet and aditus laryngis (reference can be made to Fig. 2).
After Engine ECU (Electronic Control Unit, electronic control unit) powers on, the temperature of egr system can be used
Sensor acquires the inlet temperature T of Venturi tube, and can be recorded by ECU built-in timer and provide stopping for engine
Machine duration Ti_Off, then detect by venturi differential pressure pickup the static pressure difference at venturi tube inlet and between aditus laryngis
△p。
Static pressure difference △ p=P2-P1；Wherein, P1 is the absolute static pressure at venturi tube inlet, can pass through pressure at expulsion
Sensor measurement obtains；P2 is the absolute static pressure at Venturi tube aditus laryngis；The unit of △ p, P1 and P2 are Pascal (Pa).
The inlet temperature T of Venturi tube, can be the kelvin degree of the inlet of Venturi tube.For example, using EGR
The temperature sensor of system measures the Celsius temperature of the inlet of Venturi tube, i.e. its unit is degree Celsius (DEG C), then will
It measures obtained Celsius temperature and carries out offset 273 in ECU, obtain Kelvin corresponding to Celsius temperature, unit Kai Er
Literary (K).It is of course also possible to directly adopt inlet temperature T of the Celsius temperature as Venturi tube of the inlet of Venturi tube.
S120: determine whether the static pressure difference is less than default static pressure difference threshold value.
Default static pressure difference threshold value refers to the threshold value whether being within the scope of reasonable static pressure difference for determining static pressure difference.It is default
Static pressure difference threshold value is usually predetermined according to the characteristic and practical experience of venturi differential pressure pickup.
S130: when the static pressure difference is not less than the default static pressure difference threshold value, whether the inlet temperature is determined
Less than default inlet temperature threshold value, and whether the shutdown duration is greater than default shutdown duration.
Wherein, the static pressure difference is not less than the default static pressure difference threshold value, and event occurs for characterization venturi differential pressure pickup
Barrier, the measurement result for characterizing venturi differential pressure pickup at this time is insincere, namely the characterization static pressure difference is insincere.
In general, it when static pressure difference is less than default static pressure difference threshold value, then characterizes static pressure difference and is in rationally quiet
In pressure differential range, that is, venturi differential pressure pickup normal non-fault is characterized, failure will not be quoted；When static pressure difference is not less than pre-
If when static pressure difference threshold value, then characterizing static pressure difference and being in except reasonable static pressure difference range, i.e. characterization venturi differential pressure pickup is sent out
Raw failure, then need to be implemented failure and quote.
But under colder cold regions, if venturi differential pressure pickup diaphragm freezes, static pressure difference is also resulted in
Value obtains the diagnostic result that characterization venturi differential pressure pickup breaks down not less than default static pressure difference threshold value, can actually this
When venturi differential pressure pickup itself do not break down, to belong to be fault misdescription if carrying out failure at this time and quoting.
In this regard, the present invention further passes through determination in the case where static pressure difference is not less than the default static pressure difference threshold value
Whether the inlet temperature is less than default inlet temperature threshold value, and whether the shutdown duration is greater than default shutdown duration, right
The case where venturi differential pressure pickup diaphragm freezes is diagnosed, and to avoid unreasonable fault misdescription, and is improved credibility and is examined
Disconnected accuracy and reasonability.
S140: when the inlet temperature be less than the default inlet temperature threshold value, and the shutdowns duration be greater than described in
When default shutdown duration, failure is prevented to quote according to preset strategy.
Wherein, the inlet temperature is less than the default inlet temperature threshold value, and the shutdown duration is greater than described pre-
If shutting down duration, the diaphragm for characterizing the venturi differential pressure pickup meets ice-formation condition and the static pressure difference is insincere.
That is, when the size of static pressure difference characterizes venturi differential pressure pickup failure, if venturi pressure difference sensing
The diaphragm of device meets ice-formation condition, then determines that static pressure difference at this time is insincere, further it was determined that static pressure difference is not small
It is insincere in the judgement result of default static pressure difference threshold value, and the conclusion that venturi differential pressure pickup breaks down is also insincere, this
Shi Ze prevents failure from quoting according to preset strategy, and is not to be immediately performed when static pressure difference is not less than default static pressure difference threshold value
Failure is quoted.Wherein, failure is prevented to quote the prompt information for specifically referring to prevent output venturi differential pressure pickup to break down.
It quotes to can be directly by way of forbidding generating fault message according to preset strategy prevention failure and prevents to work as
Preceding failure is quoted, and is also possible to prevent current failure from quoting by way of intercepting generated fault message, may be used also
By be by being set in delay to re-start fault detection after a certain period of time in a manner of prevent the current failure from quoting.
Venturi differential pressure pickup credibility diagnostic method provided in this embodiment first obtains the inlet temperature of Venturi tube
Static pressure difference at degree, the shutdown duration of engine and venturi tube inlet and between aditus laryngis；Then static pressure difference not
Less than default static pressure difference threshold value, i.e., when characterization venturi differential pressure pickup breaks down, by determining whether inlet temperature is small
In default inlet temperature threshold value, and shut down whether duration is greater than default shutdown duration, to determine the film of venturi differential pressure pickup
Whether piece meets ice-formation condition；And when determining that venturi differential pressure pickup diaphragm meets ice-formation condition, hindered according to preset strategy
Only failure is quoted, and is not to execute failure to quote, so as to effectively evade venturi differential pressure pickup under the conditions of Han Qu
Fault misdescription, improve venturi differential pressure pickup credibility diagnostic result accuracy and reasonability.
Referring to Fig. 3, Fig. 3 is the another of venturi differential pressure pickup credibility diagnostic method provided in an embodiment of the present invention
Kind flow chart.
As shown in figure 3, the venturi differential pressure pickup credibility diagnostic method of the present embodiment can include:
S210: the inlet temperature T of Venturi tube, the shutdown duration Ti_Off of engine and Venturi tube are obtained and is entered
Static pressure difference △ p at mouthful and between aditus laryngis.
S220: judge △ p < △ pTHIt is whether true, if it is not, then executing S230；If so, executing S260.
Wherein, △ pTHTo preset static pressure difference threshold value, herein it needs to be determined that whether the static pressure difference is less than default static pressure difference
Threshold value.Wherein, △ p >=△ pTHCharacterize venturi differential pressure pickup failure；△ p < △ pTHCharacterize venturi differential pressure pickup just
Normal fault-free.
S230: judge T < TTHAnd Ti_Off > Ti_OffTHIt is whether true, if so, executing S240；If it is not, then executing
S250。
Wherein, TTHTo preset inlet temperature threshold value, Ti_OffTHDuration is shut down to be default.
When the static pressure difference is not less than the default static pressure difference threshold value, it is pre- to determine whether the inlet temperature is less than
If inlet temperature threshold value, and whether the shutdown duration is greater than default shutdown duration.
S240: failure is prevented to quote according to preset strategy.
When the inlet temperature be less than the default inlet temperature threshold value, and the shutdowns duration be greater than it is described preset stop
It when machine duration, prevents failure from quoting according to preset strategy, and is not vertical when static pressure difference is not less than default static pressure difference threshold value
Failure is executed to quote.Wherein, the inlet temperature is less than the default inlet temperature threshold value, and the shutdown duration is greater than
The default shutdown duration, the diaphragm for characterizing the venturi differential pressure pickup meets ice-formation condition and the static pressure difference can not
Letter.
S250: it executes failure and quotes, to prompt the venturi differential pressure pickup to break down.
Described when the static pressure difference is not less than the default static pressure difference threshold value, whether the inlet temperature is determined
Less than default inlet temperature threshold value, and whether the shutdown duration is greater than after default shutdown duration, when the inlet temperature
Not less than the default inlet temperature threshold value, alternatively, executing failure when the shutdown duration is not more than the default shutdown duration
It quotes, to prompt the venturi differential pressure pickup to break down.
Wherein, the inlet temperature is not less than the default inlet temperature threshold value, alternatively, the shutdown duration is not more than
The default shutdown duration, the diaphragm for characterizing the venturi differential pressure pickup does not meet ice-formation condition and the static pressure difference can
Letter, further, static pressure difference is not less than the judgement of default static pressure difference threshold value as a result, and venturi differential pressure pickup generation event
The conclusion of barrier is credible.
S260: determining venturi differential pressure pickup normal non-fault, does not execute failure and quotes.
In one example, different inlet temperature corresponds to different default shutdown durations.Correspondingly, in step
Before S230, the method, which may also include that, obtains the default shutdown duration corresponding with the inlet temperature.
Under normal conditions, inlet temperature is lower, presets and shuts down the shorter of duration setting；Otherwise similarly.And inlet temperature
Degree and the default corresponding relationship shut down between duration, can flexibly be set according to specific requirements with historical experience, accurately to sentence
Whether disconnected venturi differential pressure pickup meets ice-formation condition, i.e. whether venturi differential pressure pickup freezes.
Venturi differential pressure pickup credibility diagnostic method provided in this embodiment, when inlet temperature not less than preset into
Mouth temperature threshold, alternatively, execution failure is quoted when shutting down duration no more than default shutdown duration, to prompt venturi pressure difference to pass
Sensor breaks down；Wherein, inlet temperature is not less than default inlet temperature threshold value, stops alternatively, shutting down duration no more than default
The diaphragm of machine duration, characterization venturi differential pressure pickup does not meet ice-formation condition and static pressure difference is credible, thus realizing Han Qu
On the basis of avoiding venturi differential pressure pickup fault misdescription under operating condition, the venturi pressure difference sensing under the area Fei Han operating condition ensure that
The Normal Diagnosis of device failure.
Referring to Fig. 4, Fig. 4 is the another of venturi differential pressure pickup credibility diagnostic method provided in an embodiment of the present invention
Kind flow chart.
As shown in figure 4, the venturi differential pressure pickup credibility diagnostic method of the present embodiment can include:
S310: the inlet temperature T of Venturi tube, the shutdown duration Ti_Off of engine and Venturi tube are obtained and is entered
Static pressure difference △ p at mouthful and between aditus laryngis.
S320: judge △ p < △ pTHIt is whether true, if it is not, then executing S330；If so, executing S360.
Wherein, △ pTHTo preset static pressure difference threshold value, herein it needs to be determined that whether the static pressure difference is less than default static pressure difference
Threshold value.Wherein, △ p >=△ pTHCharacterize venturi differential pressure pickup failure；△ p < △ pTHCharacterize venturi differential pressure pickup just
Normal fault-free.
S330: judge T < TTHAnd Ti_Off > Ti_OffTHIt is whether true, if so, executing S340；If it is not, then executing
S350。
Wherein, TTHTo preset inlet temperature threshold value, Ti_OffTHDuration is shut down to be default.
When the static pressure difference is not less than the default static pressure difference threshold value, it is pre- to determine whether the inlet temperature is less than
If inlet temperature threshold value, and whether the shutdown duration is greater than default shutdown duration.
S340: postpone default waiting time, then re-execute S310；
When the inlet temperature be less than the default inlet temperature threshold value, and the shutdowns duration be greater than it is described preset stop
When machine duration, postpone default waiting time, then re-executes the inlet temperature for obtaining Venturi tube, engine stops
The step of static pressure difference at machine duration and venturi tube inlet and between aditus laryngis (S310), and be not in static pressure difference
Value is immediately performed failure when being not less than default static pressure difference threshold value and quotes.Wherein, inlet temperature, the engine of Venturi tube are obtained
Shutdown duration and venturi tube inlet at and aditus laryngis between static pressure difference process, be also possible in Engine ECU
Power on rear real-time perfoming.
Wherein, during postponing default waiting time, EGR valve is opened, high-temperature exhaust air by Venturi tube enter into
Gas manifold, venturi differential pressure pickup can gradually thaw to non-icing condition.So postpone default waiting time, be exactly in order to
Venturi differential pressure pickup is waited to thaw to non-icing condition, the static pressure difference for obtaining its measurement is credible.
In one example, different engine water temperature value and different EGR valve opening values, correspond to different default waitings
Duration.Correspondingly, the method may also include that obtaining engine water temperature value and exhaust gas recycles EGR valve before step S340
Opening value；Obtain the default waiting time corresponding with the engine water temperature value and EGR valve opening value.
Under normal conditions, if engine water temperature value is higher, EGR valve opening value is bigger, then venturi differential pressure pickup thaws
It is faster, i.e., it is required to have default waiting time shorter；Otherwise similarly.Wherein, preset waiting time and engine water temperature value with
And the corresponding relationship between EGR valve opening value, it can flexibly be set according to specific requirements with historical experience, to guarantee venturi
Differential pressure pickup can successfully thaw after postponing default waiting time to non-icing condition.
S350: it executes failure and quotes, to prompt the venturi differential pressure pickup to break down.
When the inlet temperature is not less than the default inlet temperature threshold value, alternatively, the shutdown duration is not more than institute
When stating default shutdown duration, executes failure and quote, to prompt the venturi differential pressure pickup to break down.
Wherein, the inlet temperature is not less than the default inlet temperature threshold value, alternatively, the shutdown duration is not more than
The default shutdown duration, the diaphragm for characterizing the venturi differential pressure pickup does not meet ice-formation condition and the static pressure difference can
Letter.
S360: determining venturi differential pressure pickup normal non-fault, does not execute failure and quotes.
Venturi differential pressure pickup credibility diagnostic method provided in this embodiment, in the inlet temperature for obtaining Venturi tube
After static pressure difference at degree, the shutdown duration of engine and venturi tube inlet and between aditus laryngis, static pressure difference not
It is less than default inlet temperature threshold value less than default static pressure difference threshold value, inlet temperature, and shuts down duration and shut down duration greater than default
In the case where, after postponing default waiting time, wait venturi differential pressure pickup successfully to thaw to non-icing condition, then hold again
Row obtains at the inlet temperature of Venturi tube, the shutdown duration of engine and venturi tube inlet and between aditus laryngis
Static pressure difference step, to further increase venturi on the basis of evading fault misdescription unreasonable under cold regions
The reasonability and accuracy of differential pressure pickup credibility diagnostic result.
Referring to Fig. 5, Fig. 5 is venturi differential pressure pickup credibility diagnostic logic process provided in an embodiment of the present invention
Schematic diagram.
As shown in figure 5, venturi differential pressure pickup credibility diagnostic logic process includes:
Firstly, passing through temperature T at EGR temperature sensor collection venturi tube inlet when ECU is powered on；Based on built in ECU
Timer obtains engine and shuts down duration Ti_Off；It is collected at venturi tube inlet and at aditus laryngis by venturi differential pressure pickup
Between static pressure difference DELTA p.
Then, if Δ p < △ pTHIt sets up, then illustrates that venturi differential pressure pickup is normal, fault-free is quoted；If Δ p
< △ pTHIt is invalid, then determine T < TTHAnd Ti_Off > Ti_OffTHIt is whether true；
If T < TTHAnd Ti_Off > Ti_OffTHIt is invalid, then it is normally carried out failure and quotes and cure detection, cure inspection
Survey refers to that cancelling failure when △ p abnormality is eliminated quotes)；If T < TTHAnd Ti_Off > Ti_OffTHIt sets up, then determines
The diaphragm of venturi differential pressure pickup meets ice-formation condition, and has been delayed to certain time (for example, default waiting time) after vehicle,
It is normally carried out fault detection again and cures detection.During postponing default waiting time, EGR valve is opened, high-temperature exhaust air warp
It crosses Venturi tube and enters inlet manifold, venturi differential pressure pickup is eventually made to thaw successfully to non-icing condition.
Wherein, default waiting time can be determined according to current engine water temperature with EGR valve opening value.It is default
There is preset corresponding relationship between waiting time and engine water temperature and EGR valve opening value.
When engine operating condition is under non-cold regions, i.e., the case where icing there is no venturi differential pressure pickup diaphragm
When, ECU can in real time examine the fault condition of venturi differential pressure pickup based on the static pressure difference that measurement obtains after powering on
It is disconnected, to guarantee credible diagnostic logic and its accuracy of the venturi differential pressure pickup under non-cold regions.
If also, quoted venturi differential pressure pickup in a upper driving cycle and broken down, it can determine venturi
Differential pressure pickup indeed breaks down, and just records at this time to the malfunction of venturi differential pressure pickup, Bing Han Qu work
When next driving cycle of condition starts, directly quote venturi differential pressure pickup and break down, and no longer when inlet temperature with
Shut down prevents failure from quoting when duration meets ice-formation condition according to preset strategy.Certainly, in next driving cycle of cold area's operating condition
In, if detecting, static pressure difference is less than default static pressure difference threshold value, can cancel the failure and quote, that is, execute and cure detection process.
Technical solution of the present invention is on the basis of Engine ECU control logic, in the premise without adding new sensor
Under, the collection of relevant parameter is carried out by having sensor to engine, and by diagnostic logic appropriate, pass for pressure difference
Sensor diaphragm ice condition judges, so that it is determined that working environment locating for engine and measurement value sensor fault diagnosis are
It is no reasonable, it is normally carried out error protection if rationally and cures detection, if unreasonable prevent fault misdescription, and not only will not
The sensor fault diagnosis under the area Fei Han operating condition is influenced, a upper driving cycle will not be influenced under cold area operating condition and normally sensed
Device fault diagnosis result.
Corresponding to the venturi differential pressure pickup credibility diagnostic method of previous embodiment, the embodiment of the invention also provides
Venturi differential pressure pickup credibility diagnostic device, the venturi differential pressure pickup credibility diagnostic device are aforementioned for implementing
The venturi differential pressure pickup credibility diagnostic method that embodiment provides.Venturi differential pressure pickup credibility described below is examined
The technology contents of disconnected device, can be with the technology contents of above-described venturi differential pressure pickup credibility diagnostic method and mutually
To should refer to, corresponding part is repeated no more.
Referring to Fig. 6, Fig. 6 is one kind of venturi differential pressure pickup credibility diagnostic device provided in an embodiment of the present invention
Structural schematic diagram.
As shown in fig. 6, the venturi differential pressure pickup credibility diagnostic device of the present embodiment can include: relevant parameter obtains
Unit 10, static pressure difference diagnosis unit 20, ice-formation condition diagnosis unit 30 and fault condition processing unit 40.
Relevant parameter acquiring unit 10, for obtaining the inlet temperature of Venturi tube, the shutdown duration of engine, and
Static pressure difference at venturi tube inlet and between aditus laryngis
Static pressure difference diagnosis unit 20, for determining whether the static pressure difference is less than default static pressure difference threshold value.
Ice-formation condition diagnosis unit 30, for determining when the static pressure difference is not less than the default static pressure difference threshold value
Whether the inlet temperature is less than default inlet temperature threshold value, and whether the shutdown duration is greater than default shutdown duration.
Wherein, the static pressure difference is not less than the default static pressure difference threshold value, and event occurs for characterization venturi differential pressure pickup
Barrier.
Fault condition processing unit 40, for being less than the default inlet temperature threshold value, and institute when the inlet temperature
When stating shutdown duration greater than the default shutdown duration, failure is prevented to quote according to preset strategy.
Wherein, the inlet temperature is less than the default inlet temperature threshold value, and the shutdown duration is greater than described pre-
If shutting down duration, the diaphragm for characterizing the venturi differential pressure pickup meets ice-formation condition and the static pressure difference is insincere.
Venturi differential pressure pickup credibility diagnostic device provided in this embodiment first obtains the inlet temperature of Venturi tube
Static pressure difference at degree, the shutdown duration of engine and venturi tube inlet and between aditus laryngis；Then static pressure difference not
Less than default static pressure difference threshold value, i.e., when characterization venturi differential pressure pickup breaks down, by determining whether inlet temperature is small
In default inlet temperature threshold value, and shut down whether duration is greater than default shutdown duration, to determine the film of venturi differential pressure pickup
Whether piece meets ice-formation condition；And when determining that venturi differential pressure pickup diaphragm meets ice-formation condition, hindered according to preset strategy
Only failure is quoted, and is not to execute failure to quote, so as to effectively evade venturi differential pressure pickup under the conditions of Han Qu
Fault misdescription, improve venturi differential pressure pickup credibility diagnostic result accuracy and reasonability.
Referring to Fig. 7, Fig. 7 is the another of venturi differential pressure pickup credibility diagnostic device provided in an embodiment of the present invention
Kind structural schematic diagram.
As shown in fig. 7, the venturi differential pressure pickup credibility diagnostic device of the present embodiment may include in previous embodiment
Relevant parameter acquiring unit 10, static pressure difference diagnosis unit 20, ice-formation condition diagnosis unit 30 and fault condition processing unit
40。
In one example, under conditions of the static pressure difference is not less than the default static pressure difference threshold value, the failure feelings
Condition processing unit 40 is also used to:
Whether it is less than default inlet temperature threshold value in the determination inlet temperature, and whether the shutdown duration is big
After default shutdown duration, when the inlet temperature is not less than the default inlet temperature threshold value, alternatively, when the shutdown
It fails to grow up when the default shutdown duration, executes failure and quote, to prompt the venturi differential pressure pickup to break down；
Wherein, the inlet temperature is not less than the default inlet temperature threshold value, alternatively, the shutdown duration is not more than
The default shutdown duration, the diaphragm for characterizing the venturi differential pressure pickup does not meet ice-formation condition and the static pressure difference can
Letter.
In another example, described device may also include that threshold condition acquiring unit 50.
Threshold condition acquiring unit 50, for whether being less than default inlet temperature threshold in the determination inlet temperature
Value, and whether the shutdown duration is greater than before default shutdown duration, obtains corresponding with the inlet temperature described pre-
If shutting down duration.
Wherein, different inlet temperature corresponds to different default shutdown durations.
In another example, under conditions of the static pressure difference is not less than the default static pressure difference threshold value, the failure feelings
Condition processing unit 40 is specifically used for:
When the inlet temperature be less than the default inlet temperature threshold value, and the shutdowns duration be greater than it is described preset stop
When machine duration, postpones default waiting time, then trigger the relevant parameter acquiring unit and re-execute the acquisition venturi
The step of static pressure difference at the inlet temperature of pipe, the shutdown duration of engine and venturi tube inlet and between aditus laryngis
Suddenly.
In another example, described device may also include that waiting time acquiring unit 60.
Waiting time acquiring unit 60, for obtaining before the fault condition processing unit postpones default waiting time
It takes engine water temperature value and exhaust gas to recycle EGR valve opening value, and obtains and the engine water temperature value and EGR valve opening value
The corresponding default waiting time；
Wherein, different engine water temperature value and different EGR valve opening values, correspond to different default waiting times.
Venturi differential pressure pickup credibility diagnostic device provided in this embodiment, when inlet temperature not less than preset into
Mouth temperature threshold, alternatively, execution failure is quoted when shutting down duration no more than default shutdown duration, to prompt venturi pressure difference to pass
Sensor breaks down；Wherein, inlet temperature is not less than default inlet temperature threshold value, stops alternatively, shutting down duration no more than default
The diaphragm of machine duration, characterization venturi differential pressure pickup does not meet ice-formation condition and static pressure difference is credible, thus realizing Han Qu
On the basis of avoiding venturi differential pressure pickup fault misdescription under operating condition, the venturi pressure difference sensing under the area Fei Han operating condition ensure that
The Normal Diagnosis of device failure.
Also, it is not less than default static pressure difference threshold value, inlet temperature less than default inlet temperature threshold value in static pressure difference, and
In the case where duration is shut down greater than default shutdown duration, after postponing default waiting time, waiting venturi differential pressure pickup success
It thaws to non-icing condition, then re-executes the shutdown duration of the inlet temperature, engine that obtain Venturi tube, and literary mound
In static pressure difference step at tube inlet and between aditus laryngis, thus evading unreasonable fault misdescription under cold regions
On the basis of, further increase the reasonability and accuracy of venturi differential pressure pickup credibility diagnostic result.
Venturi differential pressure pickup credibility diagnostic device provided in an embodiment of the present invention, including processor and memory,
Above-mentioned relevant parameter acquiring unit 10, static pressure difference diagnosis unit 20, ice-formation condition diagnosis unit 30 and fault condition processing are single
Member 40, threshold condition acquiring unit 50, waiting time acquiring unit 60 etc. are used as program unit storage in memory, by
Reason device executes above procedure unit stored in memory to realize corresponding function.
Include kernel in processor, is gone in memory to transfer corresponding program unit by kernel.Kernel can be set one
Or more, the event of venturi differential pressure pickup can be reported by mistake by adjusting kernel parameter to solve prior art under cold regions
Barrier, leads to credible diagnostic accuracy and the poor technical problem of reasonability.
Memory may include the non-volatile memory in computer-readable medium, random access memory (RAM) and/
Or the forms such as Nonvolatile memory, if read-only memory (ROM) or flash memory (flash RAM), memory include that at least one is deposited
Store up chip.
The embodiment of the invention provides a kind of storage mediums, are stored thereon with program, real when which is executed by processor
The step of existing venturi differential pressure pickup credibility diagnostic method above-mentioned.
The embodiment of the invention provides a kind of processor, the processor is for running program, wherein described program operation
The step of Shi Zhihang venturi differential pressure pickup credibility diagnostic method above-mentioned.
The embodiment of the invention provides a kind of equipment, equipment include processor, memory and storage on a memory and can
The program run on a processor, processor realize venturi differential pressure pickup credibility diagnostic method above-mentioned when executing program
The step of.
Equipment herein can be server, PC, PAD, mobile phone etc..
Present invention also provides a kind of computer program products, when executing on data processing equipment, are adapted for carrying out just
Beginningization has the program of the step of venturi differential pressure pickup credibility diagnostic method above-mentioned.
Control logic of the invention can be applied on various engine models, and have the advantage that
1) functions of modules is simple, Yi Shixian.
2) the functions of modules independence is strong, it can be achieved that the strategy between difference ECU version is transplanted.
3) extend to there are it is similar wrong report failure other differential pressure pickups diagnostic logic on.
4) the higher unfailing performance of engine is obtained with lower cost input.
Finally, it is to be noted that, herein, such as first and first or the like relational terms be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
Through the above description of the embodiments, those skilled in the art can be understood that the application can be used
The form of complete hardware embodiment, complete software embodiment or embodiment combining software and hardware aspects is realized.Based on this
The understanding of sample, the technical solution of the application to background technique contribute in whole or in part can be in the form of software products
It embodies, which can store in storage medium, such as ROM/RAM, magnetic disk, CD, including several
Instruction is used so that a computer equipment (can be personal computer, server or the network equipment etc.) executes the application
Method described in certain parts of each embodiment or embodiment.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
Specific examples are used herein to illustrate the principle and implementation manner of the present application, and above embodiments are said
It is bright to be merely used to help understand the present processes and its core concept；At the same time, for those skilled in the art, foundation
The thought of the application, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as the limitation to the application.
Claims (10)
1. a kind of venturi differential pressure pickup credibility diagnostic method, which is characterized in that the described method includes:
It obtains at the inlet temperature of Venturi tube, the shutdown duration of engine and venturi tube inlet and between aditus laryngis
Static pressure difference；
Determine whether the static pressure difference is less than default static pressure difference threshold value；
When the static pressure difference be not less than the default static pressure difference threshold value when, determine the inlet temperature whether be less than preset into
Mouth temperature threshold, and whether the shutdown duration is greater than default shutdown duration；Wherein, the static pressure difference is default not less than described
Static pressure difference threshold value, characterization venturi differential pressure pickup break down；
When the inlet temperature is less than the default inlet temperature threshold value, and the shutdown duration is greater than the default shutdown
When long, failure is prevented to quote according to preset strategy；Wherein, the inlet temperature is less than the default inlet temperature threshold value, and
The shutdown duration be greater than the default shutdown duration, characterize the venturi differential pressure pickup diaphragm meet ice-formation condition and
The static pressure difference is insincere.
2. the method as described in claim 1, which is characterized in that the determination inlet temperature whether be less than preset into
Mouth temperature threshold, and whether the shutdown duration is greater than after default shutdown duration, the method also includes:
When the inlet temperature is not less than the default inlet temperature threshold value, alternatively, the shutdown duration is no more than described pre-
If shut down duration, executes failure and quote, to prompt the venturi differential pressure pickup to break down；
Wherein, the inlet temperature is not less than the default inlet temperature threshold value, alternatively, the shutdown duration is no more than described
Default to shut down duration, the diaphragm for characterizing the venturi differential pressure pickup does not meet ice-formation condition and the static pressure difference is credible.
3. the method as described in claim 1, which is characterized in that the determination inlet temperature whether be less than preset into
Mouth temperature threshold, and whether the shutdown duration is greater than before default shutdown duration, the method also includes:
Obtain the default shutdown duration corresponding with the inlet temperature；
Wherein, different inlet temperature corresponds to different default shutdown durations.
4. the method as described in claim 1, which is characterized in that described to prevent failure from quoting and include: according to preset strategy
Postpone default waiting time, when then re-executing the shutdown of the inlet temperature for obtaining Venturi tube, engine
The step of static pressure difference at long and venturi tube inlet and between aditus laryngis.
5. method as claimed in claim 4, which is characterized in that before the delay default waiting time, the method is also
Include:
It obtains engine water temperature value and exhaust gas recycles EGR valve opening value；
Obtain the default waiting time corresponding with the engine water temperature value and EGR valve opening value；
Wherein, different engine water temperature value and different EGR valve opening values, correspond to different default waiting times.
6. a kind of venturi differential pressure pickup credibility diagnostic device, which is characterized in that described device includes:
Relevant parameter acquiring unit, for obtaining the inlet temperature of Venturi tube, the shutdown duration and venturi of engine
Static pressure difference at tube inlet and between aditus laryngis；
Static pressure difference diagnosis unit, for determining whether the static pressure difference is less than default static pressure difference threshold value；
Ice-formation condition diagnosis unit, for entering described in determination when the static pressure difference is not less than the default static pressure difference threshold value
Whether temperature is less than default inlet temperature threshold value at mouthful, and whether the shutdown duration is greater than default shutdown duration；Wherein, described
Static pressure difference is not less than the default static pressure difference threshold value, and characterization venturi differential pressure pickup breaks down；
Fault condition processing unit, for being less than the default inlet temperature threshold value, and the shutdown when the inlet temperature
When duration is greater than the default shutdown duration, failure is prevented to quote according to preset strategy；Wherein, the inlet temperature is less than institute
Default inlet temperature threshold value is stated, and the shutdown duration is greater than the default shutdown duration, characterizes the venturi pressure difference sensing
The diaphragm of device meets ice-formation condition and the static pressure difference is insincere.
7. device as claimed in claim 6, which is characterized in that the fault condition processing unit is also used to:
Whether be less than default inlet temperature threshold value in the determination inlet temperature, and the shutdown duration whether be greater than it is pre-
If after shutting down duration, when the inlet temperature is not less than the default inlet temperature threshold value, alternatively, the shutdown duration is not
When greater than the default shutdown duration, executes failure and quote, to prompt the venturi differential pressure pickup to break down；
Wherein, the inlet temperature is not less than the default inlet temperature threshold value, alternatively, the shutdown duration is no more than described
Default to shut down duration, the diaphragm for characterizing the venturi differential pressure pickup does not meet ice-formation condition and the static pressure difference is credible.
8. device as claimed in claim 6, which is characterized in that described device further include:
Threshold condition acquiring unit, for whether being less than default inlet temperature threshold value in the determination inlet temperature, and
Whether the shutdown duration is greater than before default shutdown duration, obtains the default shutdown corresponding with the inlet temperature
Duration；
Wherein, different inlet temperature corresponds to different default shutdown durations.
9. device as claimed in claim 6, which is characterized in that the fault condition processing unit is specifically used for:
When the inlet temperature is less than the default inlet temperature threshold value, and the shutdown duration is greater than the default shutdown
When long, postpone default waiting time, then triggers the relevant parameter acquiring unit and re-execute the acquisition Venturi tube
The step of static pressure difference at inlet temperature, the shutdown duration of engine and venturi tube inlet and between aditus laryngis.
10. device as claimed in claim 9, which is characterized in that described device further include:
Waiting time acquiring unit, for before the fault condition processing unit postpones default waiting time, acquisition to be started
Machine water temperature value and exhaust gas recycle EGR valve opening value, and obtain corresponding with the engine water temperature value and EGR valve opening value
The default waiting time；
Wherein, different engine water temperature value and different EGR valve opening values, correspond to different default waiting times.
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| CN110469403A (en) * | 2019-09-20 | 2019-11-19 | 东风汽车集团有限公司 | Gasoline engine grain catcher pressure difference pipeline icing delayed diagnosis method |
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| CN110872996A (en) * | 2019-12-25 | 2020-03-10 | 潍柴动力股份有限公司 | Icing detection method and device for pressure type intake flow sensor |
| CN111928925A (en) * | 2020-07-16 | 2020-11-13 | 中广核核电运营有限公司 | Venturi tube fault correction method and device, computer equipment and storage medium |
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| CN114323435A (en) * | 2021-12-13 | 2022-04-12 | 潍柴动力股份有限公司 | Differential pressure sensor credibility detection method and device, electronic equipment and storage medium |
| CN114323435B (en) * | 2021-12-13 | 2023-10-20 | 潍柴动力股份有限公司 | Differential pressure sensor credibility detection method and device, electronic equipment and storage medium |
| CN114607533A (en) * | 2022-04-14 | 2022-06-10 | 一汽解放汽车有限公司 | EGR differential pressure sensor icing diagnosis processing method |
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