CN108678842A - A kind of urea concentration detection method, detection device and automobile - Google Patents
A kind of urea concentration detection method, detection device and automobile Download PDFInfo
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- CN108678842A CN108678842A CN201810469098.3A CN201810469098A CN108678842A CN 108678842 A CN108678842 A CN 108678842A CN 201810469098 A CN201810469098 A CN 201810469098A CN 108678842 A CN108678842 A CN 108678842A
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- urea concentration
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses a kind of urea concentration detection method, detection device and automobile, the concentration for detecting urea in automobile urea box, detection method includes：The urea concentration value measured by urea quality sensor is obtained in real time and detects Vehicle Speed in real time；When detecting that Vehicle Speed is greater than or equal to preset vehicle speed threshold value, the urea concentration value that the last time obtains is determined as target urea concentration value and is locked.In the present invention, the urea concentration that the last time obtains when the urea concentration value of control vehicle in the process of moving remains speed more than preset vehicle speed threshold value, and the urea concentration value is locked in vehicle travel process and is remained unchanged, avoid in vehicle travel process in urea box there are bubble or road conditions jolt cause urea pass quality sensor measure it is wrong, urea concentration value is caused to fluctuate up and down, the problem for making urea concentration measurement result inaccuracy improves the accuracy measured urea concentration in vehicle travel process.
Description
Technical field
The present embodiments relate to urea concentration detection technique more particularly to a kind of urea concentration detection method, detection dresses
It sets and automobile.
Background technology
Urea for vehicle is used in vehicle after-treatment system, and it is water-soluble that urea is sprayed into vehicle exhaust channel by nozzle
Liquid, and next life ammonification is hydrolyzed to urea by using the heat of exhaust, alternatively property catalysis restores (Selective to ammonia
Catalytic Reduction, SCR) device reducing agent, realize reduce exhaust gas from diesel vehicle in nitrogen oxides.
At present engine electronic control unit (Electronic Control Unit, ECU) detection urea concentration value be
The data of CAN bus are sent to come what is realized by receiving urea quality sensor, i.e., obtain urea quality biography in real time by ECU
Sensor is sent to the urea concentration value of CAN bus to determine current urea concentration.
However, vehicle is in the process of moving, urea quality sensor measurement to urea concentration value can be because being deposited in urea box
Jolting in bubble or traveling road conditions waits many factors to cause urea concentration measured value real-time change, causes the survey to urea concentration value
It is inaccurate to measure result.
Invention content
A kind of urea concentration detection method of present invention offer, detection device and automobile, to realize raising vehicle travel process
The accuracy that middle urea concentration value measures.
In a first aspect, an embodiment of the present invention provides a kind of urea concentration detection methods, for detecting in automobile urea box
The concentration of urea, urea quality sensor is arranged in urea box, and detection method includes：
The urea concentration value measured by urea quality sensor is obtained in real time and detects Vehicle Speed in real time；
When detecting that Vehicle Speed is greater than or equal to preset vehicle speed threshold value, by the urea concentration of the last time acquisition
Value is determined as target urea concentration value and locks.
Wherein, which further includes：When detecting that Vehicle Speed is less than preset vehicle speed threshold value, will obtain in real time
The urea concentration value taken is determined as target urea concentration value.
Wherein, after obtaining the urea concentration value measured by urea quality sensor in real time, further include：
If urea concentration value is greater than or equal to the first urea concentration threshold value and is less than or equal to the second urea concentration threshold value, will
The urea concentration value is determined as effective urea concentration value.
Wherein, when detecting that Vehicle Speed is greater than or equal to preset vehicle speed threshold value, by the urine of the last time acquisition
Plain concentration value is determined as target urea concentration value and locks, specially：
When detecting that Vehicle Speed is greater than or equal to preset vehicle speed threshold value, by effective urea of the last time acquisition
Concentration value is determined as target urea concentration value and locks.
Wherein, when detecting that Vehicle Speed is less than preset vehicle speed threshold value, the effective urea concentration that will obtain in real time
Value is determined as target urea concentration value.
Wherein, before detection Vehicle Speed in real time, further include：
Judge urea quality sensor, engine electronic control unit and connection line between the two with the presence or absence of event
Barrier, if it is not, continuing to execute the detection process to urea concentration.
Second aspect, the embodiment of the present invention additionally provides another urea concentration detection method, for detecting automobile urea
The concentration of urea in case, urea quality sensor is arranged in urea box, and detection method includes：
The urea concentration value measured by urea quality sensor is obtained in real time and detects Vehicle Speed in real time；
Liquid level in detection urea box in real time；
If the liquid level of current detection is greater than or equal to the absolute value of the difference of the liquid level of the last time detection
The urea concentration value obtained in real time is determined as target urea concentration value by the first height threshold；
If the absolute value of the difference of the liquid level of current detection and the liquid level of the last detection is less than the first height
Threshold value, then when detecting that Vehicle Speed is greater than or equal to preset vehicle speed threshold value, by the urea concentration of the last time acquisition
Value is determined as target urea concentration value and locks.
The third aspect, the embodiment of the present invention additionally provides a kind of urea concentration detection device, for detecting automobile urea box
The concentration of middle urea, urea quality sensor is arranged in urea box, and detection device includes：
Acquisition module, for obtaining the urea concentration value measured by urea quality sensor in real time；
Bus- Speed Monitoring module, for detecting Vehicle Speed in real time；
Target urea concentration value determining module, for detecting Vehicle Speed more than or equal to preset vehicle speed threshold value
When, the second urea concentration value that the last time obtains is determined as target urea concentration value and is locked.
Wherein, target urea concentration value determining module is additionally operable to detecting Vehicle Speed less than preset vehicle speed threshold value
When, the urea concentration value obtained in real time is determined as target urea concentration value.
Wherein, detection device further includes effective urea concentration value determining module, for obtaining urea quality sensing in real time
After urea concentration value measured by device, if urea concentration value is greater than or equal to the first urea concentration threshold value and less than or equal to the
The urea concentration value is determined as effective urea concentration value by two urea concentration threshold values.
Wherein, target urea concentration value determining module, specifically for detecting that it is pre- that Vehicle Speed is greater than or equal to
If when speed threshold value, effective urea concentration value that the last time obtains being determined as target urea concentration value and is locked.
Wherein, target urea concentration value determining module is additionally operable to detecting Vehicle Speed less than preset vehicle speed threshold value
When, the effective urea concentration value obtained in real time is determined as target urea concentration value.
Wherein, detection device further includes breakdown judge module, for before detection Vehicle Speed in real time：
Judge urea quality sensor, engine electronic control unit and connection line between the two with the presence or absence of event
Barrier, if it is not, continuing to execute the detection process to urea concentration.
Fourth aspect, the embodiment of the present invention additionally provides another urea concentration detection device, for detecting automobile urea
The concentration of urea in case, urea quality sensor is arranged in urea box, and detection device includes：
First acquisition module, for obtaining the urea concentration value measured by urea quality sensor in real time；
First Bus- Speed Monitoring module, for detecting Vehicle Speed in real time；
First level sensing module, for detecting liquid level in urea box in real time；
First object urea concentration value determining module, if the liquid of the liquid level and the last detection for current detection
The absolute value of the difference of face height is greater than or equal to the first height threshold, and the urea concentration value obtained in real time is determined as target urine
Plain concentration value；
And if being additionally operable to the liquid level of current detection and the absolute value of the difference of the liquid level of the last detection is small
In the first height threshold, then when detecting that Vehicle Speed is greater than or equal to preset vehicle speed threshold value, the last time is obtained
Urea concentration value be determined as target urea concentration value and lock.
5th aspect, the embodiment of the present invention additionally provide a kind of automobile, including as the above-mentioned third aspect and fourth aspect are appointed
On the one hand the detection device provided.
Wherein, which further includes engine electronic control unit, and what the detection device was integrated in automobile starts electromechanics
In sub-control unit.
The present invention provides urea concentration detection method, detection device and automobiles, by obtaining urea in urea box in real time
Urea concentration value measured by quality sensor and Vehicle Speed is detected in real time；Detecting that Vehicle Speed is big
When preset vehicle speed threshold value, the urea concentration value that the last time obtains is determined as target urea concentration value and is locked.
So that the last time acquisition when the urea concentration value of vehicle in the process of moving remains speed more than preset vehicle speed threshold value
Urea concentration, and lock the urea concentration value in vehicle travel process and remain unchanged, avoid urea box in vehicle travel process
In there are bubble or road conditions jolt cause urea pass quality sensor measure it is wrong caused by urea concentration value fluctuate up and down, make urine
The problem of plain concentration measurement inaccuracy, improves the accuracy measured urea concentration in vehicle travel process.
Description of the drawings
Fig. 1 is a kind of flow chart for urea concentration detection method that the embodiment of the present invention one provides.
Fig. 2 is a kind of flow chart of urea concentration detection method provided by Embodiment 2 of the present invention.
Fig. 3 is a kind of flow chart for urea concentration detection method that the embodiment of the present invention three provides.
Fig. 4 is a kind of structural schematic diagram for urea concentration detection device that the embodiment of the present invention four provides.
Fig. 5 is a kind of structural schematic diagram for urea concentration detection device that the embodiment of the present invention five provides.
Fig. 6 is a kind of structural schematic diagram for urea concentration detection device that the embodiment of the present invention six provides.
Fig. 7 is a kind of structural schematic diagram for automobile that the embodiment of the present invention seven provides.
Specific implementation mode
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limitation of the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Embodiment one
Fig. 1 is a kind of flow chart for urea concentration detection method that the embodiment of the present invention one provides, and the present embodiment is applicable
In detect urea concentration in vehicle urea box the case where, this method can be executed by urea concentration detection device, for detecting
The concentration of urea in automobile urea box, urea quality sensor is arranged in urea box, and detection method includes：
Step 110 obtains the urea concentration value measured by urea quality sensor and detects vehicle traveling in real time in real time
Speed.
Urea quality sensor is set in vehicle urea box, and it is dense that urea quality sensor can measure urea in urea box in real time
Angle value, in stationary vehicle, urea box liquid level is more steady, and does not have many bubbles, measured by urea quality sensor
Urea concentration value is more accurate.And a large amount of bubbles may be will produce when the vehicle is running, in urea box, and it is uneven on road surface
When, vehicle jolts, and situation is more serious, these situations may all cause the urea concentration value measured by urea quality sensor not
Accurately.Therefore, engine electronic control unit after the power is turned on, urea concentration detection device can obtain urea quality sensor in real time
Measured urea concentration value and Vehicle Speed is detected in real time, to judge that vehicle runs shape according to Vehicle Speed
State, wherein travel condition of vehicle include stationary state and transport condition, and use distinct methods according to the operating status of vehicle
It determines target urea concentration value, and then improves the accuracy that urea concentration measures.
Step 120, detect Vehicle Speed be greater than or equal to preset vehicle speed threshold value when, by the last time obtain
Urea concentration value is determined as target urea concentration value and locks.
Wherein, preset vehicle speed threshold value can be preset, and the preset vehicle speed threshold value is therefore pre- to judge travel condition of vehicle
If speed threshold value value is without excessive, you can judge that vehicle remains static still transport condition, such as preset vehicle speed threshold value
Can be 2km/h.When detecting that vehicle running state is greater than or equal to the preset vehicle speed threshold value, it is possible to determine that vehicle is in row
Sail state.When vehicle is in transport condition, in fact it could happen that due to jolting etc. and to cause there are bubble or road conditions in above-mentioned urea box
Urea concentration value measured by urea quality sensor is inaccurate.And vehicle is in the process of moving, driver usually will not be to urine
Plain case is added operations, i.e. the urea concentration value such as urea and addition water and generally remains in the process of moving constant.Therefore when detection
When being more than preset vehicle speed threshold value to Vehicle Speed, it is dense the urea concentration value that the last time obtains can be determined as target urea
Angle value, and the target urea concentration value is locked.
Illustratively, when user uses vehicle, after twisting key, engine electronic control unit powers on, urea quality sensing
Device measures urea concentration in urea box in real time.Engine electronic control unit powers on and when stationary vehicle, urea quality sensor
Urea concentration value can relatively accurately be measured.After vehicle launch enters transport condition, Vehicle Speed is more than preset vehicle speed threshold
The urea concentration value that the last time obtains after urea concentration detection device detects this kind of situation, is determined as target urea by value
Concentration value, that is, the urea concentration value finally measured that vehicle is remained static is as target urea concentration value, and with
In driving process afterwards, which is locked, to avoid bubble or road conditions in urea box in vehicle travel process
It jolts etc. and to cause the problem of the urea concentration value inaccuracy measured by urea quality sensor.
On the basis of said program, which further includes：
Step 130, when detecting that Vehicle Speed is less than preset vehicle speed threshold value, the urea concentration value that will obtain in real time
It is determined as target urea concentration value.
Specifically, when Vehicle Speed is less than preset vehicle speed threshold value, it is possible to determine that vehicle is not in transport condition, at this time
Many bubbles are not had in urea box, the factor that road conditions are jolted, the urea concentration measured by urea quality sensor is also not present
Value is more accurate.Therefore in vehicle when detecting that Vehicle Speed is less than preset vehicle speed threshold value, the urea concentration that will obtain in real time
Value is determined as target urea concentration value.
Urea concentration detection method provided in this embodiment is surveyed by obtaining urea quality sensor in urea box in real time
Urea concentration value and detect Vehicle Speed in real time；Vehicle is preset detecting that Vehicle Speed is greater than or equal to
When fast threshold value, the urea concentration value that the last time obtains is determined as target urea concentration value and is locked.So that vehicle is travelling
The urea concentration that the last time obtains when urea concentration value in the process remains speed more than preset vehicle speed threshold value, and in vehicle
The urea concentration value is locked in driving process to remain unchanged, and avoids in vehicle travel process that there are bubble or road conditions in urea box
It jolts and urea is caused to pass the wrong caused urea concentration value fluctuation up and down of quality sensor measurement, make urea concentration measurement result not
Accurate problem improves the accuracy measured urea concentration in vehicle travel process.
Embodiment two
Fig. 2 is a kind of flow chart of urea concentration detection method provided by Embodiment 2 of the present invention, and the present embodiment is above-mentioned
On the basis of embodiment one, it is further provided a kind of optional urea concentration detection method.
Optionally, after obtaining the urea concentration value measured by urea quality sensor in real time, further include：
If step 140, urea concentration value are more than or equal to the first urea concentration threshold value and dense less than or equal to the second urea
Threshold value is spent, which is determined as effective urea concentration value.
There are when bubble, the urea concentration value measured by urea quality sensor may go out in urea box urea liquid
Existing saltus step, measured urea concentration value is typically inaccurate in this case, so to be surveyed to urea quality sensor
The urea concentration value obtained carries out the judgement of validity.Specifically, the bound threshold value of urea concentration can be preset, i.e., first
Urea concentration threshold value and the second urea concentration threshold value.Wherein, the first urea concentration value is minimum urea concentration when vehicle is normal
Value, highest urea concentration value when the second urea concentration value vehicle is normal.For example, the first urea concentration threshold value is 32%, second
Urea concentration threshold value is 34%.
Specifically, when the measured urea concentration value for getting urea quality sensor is dense more than or equal to the first urea
When spending threshold value and being less than or equal to the second urea concentration threshold value, it can determine that the urea concentration value is effective, be determined as effectively urinating
Plain concentration value.When the measured urea concentration value for getting urea quality sensor is less than the first urea concentration threshold value, or it is big
In the second urea concentration threshold value, it can determine that the urea concentration value is invalid, and effective urea concentration value that the last time is determined is true
It is set to current effective urea concentration value.Illustratively, when the first urea concentration threshold value is 32%, the second urea concentration threshold value is
It is if it is 33% to get the urea concentration value measured by urea quality sensor, the urea concentration value 33% is true when 34%
It is set to effective urea concentration value；Continue to obtain the urea concentration value measured by urea quality sensor in the next sampling period, if
It is 35% that the sampling period, which gets the urea concentration value measured by urea quality sensor, then judges the urea concentration value 35%
For invalid urea concentration value, and the effective urea concentration value 33% determined in the last sampling period is determined as current having
Imitate urea concentration value.
In addition, also can judge the effective of urea concentration value by urea concentration difference acquired in two sampling periods
Property.Optionally, urea concentration difference threshold is preset, when urea concentration value acquired in the n-th sampling period and when (n-1)th
When the absolute value of acquired urea concentration value difference value is less than urea concentration value difference threshold in sampling period, the n-th sampling of judgement
Acquired urea concentration value is effective urea concentration value in period；Conversely, will judge urea acquired in the n-th sampling period
Concentration value is invalid, and identified effective urea concentration value in the (n-1)th period is determined as effective urea in the n-th sampling period
Concentration value.
Optionally, when detecting that Vehicle Speed is greater than or equal to preset vehicle speed threshold value, the last time is obtained
Urea concentration value is determined as target urea concentration value and locks, specially：
Step 121, detect Vehicle Speed be greater than or equal to preset vehicle speed threshold value when, by the last time obtain
Effective urea concentration value is determined as target urea concentration value and locks.
Such as above-mentioned analysis, because the urea concentration value measured by urea quality sensor because in urea box there are bubble caused by survey
Amount is inaccurate, after the effective urea concentration value of determination, if detecting Vehicle Speed more than or equal to preset vehicle speed threshold
When value, effective urea concentration value that the last time obtains is determined as target urea concentration value and is locked, to further increase
Vehicle is when driving to the accuracy of urea concentration detection.
Optionally, step 130 can be specifically optimized for：
Step 131, detect Vehicle Speed be less than preset vehicle speed threshold value when, the effective urea obtained in real time is dense
Angle value is determined as target urea concentration value.
Such as above-mentioned analysis, because the urea concentration value measured by urea quality sensor because in urea box there are bubble caused by survey
Amount is inaccurate,, will be real when detecting that Vehicle Speed is less than preset vehicle speed threshold value after the effective urea concentration value of determination
When effective urea concentration value for obtaining be determined as target urea concentration value, to urea concentration when to further increase stationary vehicle
The accuracy of detection.
Wherein, before detection Vehicle Speed in real time, further include：
Whether step 101 judges urea quality sensor, engine electronic control unit and connection line between the two
There are failures, if it is not, continuing to execute the detection process to urea concentration.
Specifically, urea quality sensor can be connect with engine electronic control unit by CAN bus in urea box,
Urea concentration value measured by urea quality sensor is transferred to engine electronic control unit by CAN bus.It is detected in real time
Before Vehicle Speed, urea quality sensor, engine electronic control unit and connecting line between the two are first determined whether
Road whether there is failure, if failure is not present, can continue to execute the detection process to urea concentration；If there are failures, if after
Continuous detection urea concentration, can cause testing result inaccurate.If therefore there are when failure, control exits the detection to urea concentration simultaneously
It reports an error.
Urea concentration detection method provided in this embodiment, by the urea concentration value measured by urea quality sensor
Effective judgement is carried out, be greater than or equal to the first urea concentration threshold value in urea concentration value and is less than or equal to the second urea concentration
When threshold value, which is determined as effective urea concentration value；It is and under any travel condition of vehicle, effective urea is dense
Angle value is determined as target urea concentration value, further improves the accuracy detected to urea concentration.
Embodiment three
Fig. 3 is a kind of flow chart for urea concentration detection method that the embodiment of the present invention three provides, and the present embodiment is applicable
In detect urea concentration in vehicle urea box the case where, this method can be executed by urea concentration detection device, for detecting
The concentration of urea in automobile urea box, urea quality sensor is arranged in urea box, and detection method includes：
Step 210 obtains the urea concentration value measured by urea quality sensor and detects vehicle traveling in real time in real time
Speed；
Step 220 detects liquid level in urea box in real time；
In urea box in addition to urea quality sensor is set, it is also provided with cooling tube, it is cold to be connected with engine in cooling tube
But liquid to cool down urea box when the temperature is excessively high in urea box, or thaws when freezing phenomena occurs in urea box.Then,
With the use of vehicle, cooling tube will appear aging phenomenon, in some instances it may even be possible to rupture.When cooling tracheal rupture, engine is cold
But liquid can flow into urea box, and urea concentration in urea box is made to vary widely.If at this point, in vehicle travel process, still
Urea concentration value is locked, urea concentration value can be caused to measure inaccurate, therefore can be by detecting the height of the liquid level in urea box in real time
Degree determines whether cooling tube ruptures in urea box, and the result whether ruptured according to the cooling tube determined is using not Tongfang
Method detects urea concentration, to improve the accuracy detected to urea concentration.
If the liquid level of step 230, current detection is big with the absolute value of the difference of the liquid level of the last time detection
In or equal to the first height threshold, the urea concentration value obtained in real time is determined as target urea concentration value；
Optionally, the first height threshold is preset, when the first height threshold can be that cooling tube does not rupture in urea box
The maximum value of the detection exhausted angle value of liquid level difference in the adjacent double sampling period.If then the liquid level of current detection with recently
The absolute value of the difference of the liquid level of one-time detection is greater than or equal to the first height threshold, can determine that cooling tracheal rupture, urea
Concentration can vary widely, and need the urea for being detected in real time to urea concentration, therefore urea quality sensor being measured in real time
Concentration value is determined as target urea concentration value.
If the liquid level of step 240, current detection and the absolute value of the difference of the liquid level of the last time detection are less than
First height threshold obtains the last time then when detecting that Vehicle Speed is greater than or equal to preset vehicle speed threshold value
Urea concentration value is determined as target urea concentration value and locks.
Specifically, if the absolute value of the difference of the liquid level of current detection and the liquid level of the last detection is less than the
One height threshold can determine that cooling tube does not rupture, and urea concentration is held essentially constant vehicle in the process of moving at this time.Therefore
When detecting that Vehicle Speed is greater than or equal to preset vehicle speed threshold value, judgement vehicle is in transport condition, then by nearest one
The urea concentration value of secondary acquisition is determined as target urea concentration value and locks, and then in the micro- item ruptured of urea box cooling tube
Under part, the urea concentration value caused by there is a problem of that bubble or road conditions jolt in urea box is avoided to measure inaccuracy.
Urea concentration detection method provided in this embodiment is judged cooling in urea box by detecting liquid level in real time
Whether pipe ruptures, and in the big of the liquid level of current detection and the absolute value of the difference of the last liquid level detected
When the first height threshold, judges cooling tracheal rupture, it is dense that the urea concentration value obtained in real time is determined as target urea
Angle value；And the liquid level of current detection and the absolute value of the difference of the liquid level of the last detection are less than the first height threshold
When value, judgement cooling tube does not rupture, will be nearest when detecting that Vehicle Speed is greater than or equal to preset vehicle speed threshold value
The urea concentration value once obtained is determined as target urea concentration value and locks.Urea concentration detection side provided in this embodiment
Method, it is contemplated that in urea box cooling tube whether there is a situation where rupturing, and then judge cooling tube rupture when, according to urea
The urea concentration value that quality sensor measures in real time determines target urea concentration, further improves the standard detected to urea concentration
True property.
Example IV
Fig. 4 is a kind of structural schematic diagram for urea concentration detection device that the embodiment of the present invention four provides, for detecting vapour
The concentration of urea in vehicle urea box, urea quality sensor is arranged in urea box, and detection device includes：
Acquisition module 310, for obtaining the urea concentration value measured by urea quality sensor in real time；
Bus- Speed Monitoring module 320, for detecting Vehicle Speed in real time；
Target urea concentration value determining module 330, for detecting Vehicle Speed more than or equal to preset vehicle speed
When threshold value, the second urea concentration value that the last time obtains is determined as target urea concentration value and is locked.
Urea concentration detection device provided in this embodiment is obtained urea quality in urea box by acquisition module and passed in real time
Urea concentration value and Bus- Speed Monitoring module measured by sensor detect Vehicle Speed in real time；And pass through target urea
Concentration value determining module is when detecting that Vehicle Speed is greater than or equal to preset vehicle speed threshold value, by the urine of the last time acquisition
Plain concentration value is determined as target urea concentration value and locks.So that the urea concentration value of vehicle in the process of moving remains speed
The urea concentration that the last time obtains when more than preset vehicle speed threshold value, and the urea concentration value is locked in vehicle travel process
It remains unchanged, avoids in vehicle travel process jolting there are bubble or road conditions in urea box and causing urea to pass quality sensor to measure
Urea concentration value caused by wrong fluctuates up and down, makes the problem of urea concentration measurement result inaccuracy, improves vehicle and run over
The accuracy that urea concentration is measured in journey.
Embodiment five
Fig. 5 is a kind of structural schematic diagram for urea concentration detection device that the embodiment of the present invention five provides, and the present embodiment is built
It stands on the basis of above-described embodiment four, it is further provided a kind of optional urea concentration detection device.
Optionally, target urea concentration value determining module 330 is additionally operable to detecting Vehicle Speed less than default vehicle
When fast threshold value, the urea concentration value obtained in real time is determined as target urea concentration value.
Optionally, detection device further includes effective urea concentration value determining module 340, for obtaining urea quality in real time
After urea concentration value measured by sensor, if urea concentration value is greater than or equal to the first urea concentration threshold value and is less than or waits
In the second urea concentration threshold value, which is determined as effective urea concentration value.
Optionally, target urea concentration value determining module 330, specifically for detecting that Vehicle Speed is more than or waits
When preset vehicle speed threshold value, effective urea concentration value that the last time obtains is determined as target urea concentration value and is locked.
Optionally, target urea concentration value determining module 330 is additionally operable to detecting Vehicle Speed less than default vehicle
When fast threshold value, the effective urea concentration value obtained in real time is determined as target urea concentration value.
Optionally, detection device further includes breakdown judge module 350, for before detection Vehicle Speed in real time：
Judge urea quality sensor, engine electronic control unit and connection line between the two with the presence or absence of event
Barrier, if it is not, continuing to execute the detection process to urea concentration.
Urea concentration detection device provided in this embodiment passes urea quality by effective urea concentration value determining module
Urea concentration value measured by sensor carries out Effective judgement, and by target urea concentration value determining module in urea concentration
Value determines the urea concentration value more than or equal to the first urea concentration threshold value and when being less than or equal to the second urea concentration threshold value
For effective urea concentration value；And under any travel condition of vehicle, effective urea concentration value is determined as target urea concentration value,
Further improve the accuracy detected to urea concentration.
Embodiment six
Fig. 6 is a kind of structural schematic diagram for urea concentration detection device that the embodiment of the present invention six provides, for detecting vapour
The concentration of urea in vehicle urea box, urea quality sensor is arranged in urea box, and detection device includes：
First acquisition module 410, for obtaining the urea concentration value measured by urea quality sensor in real time；
First Bus- Speed Monitoring module 420, for detecting Vehicle Speed in real time；
First level sensing module 430, for detecting liquid level in urea box in real time；
First object urea concentration value determining module 440, if the liquid level for current detection is detected with the last
Liquid level absolute value of the difference be greater than or equal to the first height threshold, the urea concentration value obtained in real time is determined as mesh
Mark urea concentration value；
And if being additionally operable to the liquid level of current detection and the absolute value of the difference of the liquid level of the last detection is small
In the first height threshold, then when detecting that Vehicle Speed is greater than or equal to preset vehicle speed threshold value, the last time is obtained
Urea concentration value be determined as target urea concentration value and lock.
Urea concentration detection device provided in this embodiment detects liquid level in real time by the first level sensing module,
And then judge whether cooling tube ruptures in urea box, and by first object urea concentration value determining module in current detection
Liquid level with the absolute value of the difference of the liquid level of the last detection when being greater than or equal to the first height threshold, judgement
Cooling tracheal rupture, is determined as target urea concentration value by the urea concentration value obtained in real time；And the liquid level of current detection
With the last time detection liquid level absolute value of the difference be less than the first height threshold when, judgement cooling tube to rupture,
When detecting that Vehicle Speed is greater than or equal to preset vehicle speed threshold value, the urea concentration value that the last time obtains is determined as
Target urea concentration value simultaneously locks.Urea concentration detection device provided in this embodiment, it is contemplated that whether cooling tube in urea box
There is a situation where rupturing, and then when judging that cooling tube ruptures, the urea measured in real time according to urea quality sensor is dense
Angle value determines target urea concentration, further improves the accuracy detected to urea concentration.
Embodiment seven
Fig. 7 is a kind of structural schematic diagram of automobile provided in an embodiment of the present invention.With reference to figure 7, the embodiment of the present invention also carries
A kind of automobile 10 has been supplied, has included the detection device 300 provided such as the above-mentioned third aspect and fourth aspect either side.
Wherein, which further includes engine electronic control unit 30, and above-mentioned urea concentration detection device 300 is integrated in
In the engine electronic control unit 30 of automobile.
Automobile provided in this embodiment, by obtaining the urea concentration in urea box measured by urea quality sensor in real time
Value and Vehicle Speed is detected in real time；It, will most when detecting that Vehicle Speed is greater than or equal to preset vehicle speed threshold value
The nearly urea concentration value once obtained is determined as target urea concentration value and locks.So that the urea of vehicle in the process of moving is dense
The urea concentration that the last time obtains when angle value remains speed more than preset vehicle speed threshold value, and locked in vehicle travel process
The fixed urea concentration value remains unchanged, and avoids in vehicle travel process jolting urea being caused to pass there are bubble or road conditions in urea box
Quality sensor measures wrong caused urea concentration value and fluctuates up and down, makes the problem of urea concentration measurement result inaccuracy, carries
The accuracy that urea concentration is measured in high vehicle travel process.
Note that above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The present invention is not limited to specific embodiments described here, can carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out to the present invention by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
May include other more equivalent embodiments, and the scope of the present invention is determined by scope of the appended claims.
Claims (16)
1. a kind of urea concentration detection method, which is characterized in that the concentration for detecting urea in automobile urea box, the urea
Urea quality sensor is set in case, and the detection method includes：
The urea concentration value measured by the urea quality sensor is obtained in real time and detects Vehicle Speed in real time；
When detecting that the Vehicle Speed is greater than or equal to preset vehicle speed threshold value, by the urea concentration of the last time acquisition
Value is determined as target urea concentration value and locks.
2. detection method according to claim 1, which is characterized in that further include：Detecting the Vehicle Speed
When less than the preset vehicle speed threshold value, the urea concentration value obtained in real time is determined as the target urea concentration value.
3. detection method according to claim 1, which is characterized in that obtain in real time measured by the urea quality sensor
Urea concentration value after, further include：
If the urea concentration value is greater than or equal to the first urea concentration threshold value and is less than or equal to the second urea concentration threshold value, will
The urea concentration value is determined as effective urea concentration value.
4. detection method according to claim 3, which is characterized in that detecting that the Vehicle Speed is more than or waits
When preset vehicle speed threshold value, the urea concentration value that the last time obtains is determined as target urea concentration value and is locked, specially：
When detecting that the Vehicle Speed is greater than or equal to the preset vehicle speed threshold value, the last time is obtained effective
Urea concentration value is determined as the target urea concentration value and locks.
5. detection method according to claim 3, which is characterized in that detecting that it is described that the Vehicle Speed is less than
When preset vehicle speed threshold value, the effective urea concentration value obtained in real time is determined as the target urea concentration value.
6. detection method according to claim 1, which is characterized in that before the real-time detection Vehicle Speed,
Further include：
Judge the urea quality sensor, engine electronic control unit and connection line between the two with the presence or absence of event
Barrier, if it is not, continuing to execute the detection process to urea concentration.
7. a kind of urea concentration detection method, which is characterized in that the concentration for detecting urea in automobile urea box, the urea
Urea quality sensor is set in case, and the detection method includes：
The urea concentration value measured by the urea quality sensor is obtained in real time and detects Vehicle Speed in real time；
Liquid level in the urea box is detected in real time；
If the liquid level of current detection is greater than or equal to the absolute value of the difference of the liquid level of the last time detection
The urea concentration value obtained in real time is determined as target urea concentration value by the first height threshold；
If the absolute value of the difference of the liquid level of current detection and the liquid level of the last detection is less than the first height
Threshold value, then when detecting that the Vehicle Speed is greater than or equal to preset vehicle speed threshold value, by the urea of the last time acquisition
Concentration value is determined as target urea concentration value and locks.
8. a kind of urea concentration detection device, which is characterized in that the concentration for detecting urea in automobile urea box, the urea
Urea quality sensor is set in case, and the detection device includes：
Acquisition module, for obtaining the urea concentration value measured by urea quality sensor in real time；
Bus- Speed Monitoring module, for detecting Vehicle Speed in real time；
Target urea concentration value determining module, for detecting the Vehicle Speed more than or equal to preset vehicle speed threshold value
When, the second urea concentration value that the last time obtains is determined as target urea concentration value and is locked.
9. detection device according to claim 8, which is characterized in that the target urea concentration value determining module is additionally operable to
When detecting that the Vehicle Speed is less than the preset vehicle speed threshold value, the urea concentration value obtained in real time is determined as institute
State target urea concentration value.
10. detection device according to claim 8, which is characterized in that further include effective urea concentration value determining module, use
In after obtaining the urea concentration value measured by urea quality sensor in real time, if the urea concentration value is greater than or equal to the
One urea concentration threshold value and be less than or equal to the second urea concentration threshold value, which is determined as effective urea concentration
Value.
11. detection device according to claim 10, which is characterized in that the target urea concentration value determining module, tool
Body is used for when detecting that the Vehicle Speed is greater than or equal to the preset vehicle speed threshold value, by having for the last time acquisition
Effect urea concentration value is determined as the target urea concentration value and locks.
12. detection device according to claim 10, which is characterized in that the target urea concentration value determining module is also used
In detect the Vehicle Speed be less than the preset vehicle speed threshold value when, the effective urea concentration value obtained in real time is true
It is set to the target urea concentration value.
13. detection device according to claim 8, which is characterized in that the detection device further includes breakdown judge module,
For before the real-time detection Vehicle Speed：
Judge the urea quality sensor, engine electronic control unit and connection line between the two with the presence or absence of event
Barrier, if it is not, continuing to execute the detection process to urea concentration.
14. a kind of urea concentration detection device, which is characterized in that the concentration for detecting urea in automobile urea box, the urine
Urea quality sensor is set in plain case, and the detection device includes：
First acquisition module, for obtaining the urea concentration value measured by the urea quality sensor in real time；
First Bus- Speed Monitoring module, for detecting Vehicle Speed in real time；
First level sensing module, for detecting liquid level in the urea box in real time；
First object urea concentration value determining module, if the liquid of the liquid level and the last detection for current detection
The absolute value of the difference of face height is greater than or equal to the first height threshold, and the urea concentration value obtained in real time is determined as the mesh
Urea concentration value is marked, and if being additionally operable to the liquid level of current detection and the difference of the last liquid level detected
Absolute value is less than the first height threshold, then, will when detecting that the Vehicle Speed is greater than or equal to preset vehicle speed threshold value
The urea concentration value that the last time obtains is determined as target urea concentration value and locks.
15. a kind of automobile, which is characterized in that including such as claim 8-14 any one of them detection device.
16. automobile according to claim 15, which is characterized in that further include engine electronic control unit, the detection
Device is integrated in the engine electronic control unit of automobile.
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