CN105604663A - Fault detection method and detection device for SCR system cooling liquid electromagnetic valve - Google Patents

Fault detection method and detection device for SCR system cooling liquid electromagnetic valve Download PDF

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Publication number
CN105604663A
CN105604663A CN201510964005.0A CN201510964005A CN105604663A CN 105604663 A CN105604663 A CN 105604663A CN 201510964005 A CN201510964005 A CN 201510964005A CN 105604663 A CN105604663 A CN 105604663A
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Prior art keywords
urea
temperature
preset value
electromagnetic valve
liquid
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CN201510964005.0A
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CN105604663B (en
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施泰峰
刘玉伟
孙世强
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention discloses a fault detection method and detection device for an SCR system cooling liquid electromagnetic valve. The method specifically comprises the steps that an ECU is initialized, and the environment temperature T00 under an initial state and the temperature T0 of a urea solution in a urea box are prestored to the ECU; the temperature T1 of the urea solution in the urea box at the current moment is detected; whether T1 is larger than a first preset value or whether T1-T0 is larger than or equal to a second preset value is judged at the environment temperature T00 stored in the ECU, and if one of judging results is yes, a cooling liquid electromagnetic valve fault control command is output. According to the detection method, hardware defects of the cooling liquid electromagnetic valve are reasonably judged according to the temperature of the urea solution and the temperature changing difference value, the judging results can be reported to a driver to prompt the driver that the cooling liquid electromagnetic valve is blocked or not switched off, therefore, the driver can replace the cooling liquid electromagnetic valve with a new one in time, and the method is beneficial for preventing environmental pollution and keeping the good economy and dynamic properties of an engine.

Description

A kind of SCR system cools liquid electromagnetic valve fault detection method, checkout gear
Technical field
The present invention relates to Electromagnetic Control technical field, particularly a kind of SCR system cools liquid electricityMagnet valve fault detection method, checkout gear.
Background technology
Diesel engine is as a kind of dynamic power machine, for outstanding contribution has been made in social development, but withTime also cause the pollution of environment. Along with the increasingly stringent of national legislation, to diesel emission requirementMore and more higher, it is more and more difficult that simple dependence raising engine technology is realized emission compliance, at thisIn the situation of kind, introduce SCR after-treatment system.
SCR system basic functional principle: exhaust enters blast pipe from booster turbine flows outIn, simultaneously by be arranged on urea-spray unit on blast pipe by quantitative aqueous solution of urea with mistShape form sprays in blast pipe, urea droplets high-temp waste gas effect issue unboiled water solution and pyrolysis anti-Should, generate needed reducing agent ammonia (NH3), ammonia (NH3) in the effect of catalystLower to the main harmful components nitrogen oxide (NO in diesel exhaust gasx) reduction selectivelyFor nitrogen (N2). The normal job requirement urea liquid of SCR system is liquid condition, but ureaSolution properties be-11 DEG C following will freeze icing, in order to ensure that SCR system normally works, SCRSystem has increased Urea function. In the time that urea exists risk of icing, Urea function opensMoving, heat to respectively urea box, urea pump and urea pipe, ensure that urea liquid is liquidBody state.
Cooling fluid electromagnetic valve switch two ends connect plastic flexible pipe, and flexible pipe is connected respectively to engine originallyBody and urea box heat U-shaped interface tube place, export high low-voltage control water valve by ECUThe unlatching of valve, heats the low temperature urea in urea box, ensures the normal work of SCR systemIn work, urea is liquid condition. Because cooling fluid electromagnetic valve switch is simply to open and close valve, send outImpurity in motivation cooling fluid is easy to cause the clamping stagnation of cooling fluid electromagnetic valve switch, in addition this valveDoor is along with continuous wearing and tearing, and the not tight situation of valve closes will occur.
Once there is the not tight situation of cooling fluid electromagnetic valve switch valve closes, from the angle of controllingECU cannot avoid problems, and the cooling fluid of engine will constantly heat U-shaped by urea boxPipe is to Urea. The rotten temperature of urea liquid is approximately 75 DEG C, if engine coolantTemperature is for a long time in more than 80 DEG C, and urea liquid will go bad, and urea is rotten itself will be dirtyDying environment simultaneously cannot Reduction of NOx, cause engine discharge to exceed standard.
And, especially at cold district, due to Engine Inlet Temperature and cooling water temperature very low,Engine is originally with regard to difficulty in starting, if exist cooling fluid electromagnetic valve switch clamping stagnation or closure not tightSituation, make the startup of engine more difficult; When exist cooling fluid electromagnetic valve switch clamping stagnation orWhen closed not tight fault, it is molten that the heat that oil inflame discharges has quite a few to carry out heating ureaLiquid instead of acting, cause the dynamic property variation of engine, simultaneously engine start Oil ConsumptionIncrease Fuel Economy variation.
Therefore, how to find in time the not tight phenomenon of cooling fluid magnetic valve clamping stagnation or closure, avoid ureaSolution is crossed thermal metamorphism, and improve engine power performance, be those skilled in that art urgentlyThe technical problem solving.
Summary of the invention
Object of the present invention for provide a kind of SCR system cools liquid electromagnetic valve fault detection method,Checkout gear, the method can be found the not tight phenomenon of cooling fluid magnetic valve clamping stagnation or closure in time, keeps awayExempt from urea liquid and cross thermal metamorphism, and improve engine power performance.
For solving the problems of the technologies described above, the invention provides a kind of SCR system cools liquid electromagnetic valve eventBarrier detection method, the method is specially:
S0, ECU initialize;
Environment temperature T under S1, the original state that prestores00, urea box inside urea liquid temperatureT0To ECU;
The temperature T of the urea liquid of urea box inside described in S2, detection current time1; JudgeThe environment temperature T of above-mentioned ECU storage00Under, T1Whether be greater than the first preset value or T1-T0BeNoly be more than or equal to the second preset value, if wherein one judged result is yes, export cooling fluidSolenoid valve failure control instruction.
The detection method that provided is herein for cooling fluid magnetic valve hardware deficiency, by arrangingThe parameters such as rational environment temperature, urea liquid temperature, according to urea liquid temperature and temperatureChange difference cooling fluid magnetic valve hardware deficiency is rationally judged, and can be by judged resultReport and submit to driver and point out driver's cooling fluid magnetic valve clamping stagnation or not closed, so as driver andShi Genghuan cooling fluid magnetic valve, is conducive to prevent the pollution of the environment and keeps the good economy of engineProperty and dynamic property.
Optionally, between step S1 and step S2, also further increase following steps:
S12, real-time testing environment temperature T01, judge environment temperature T01The ring prestoring with ECUBorder temperature T00Difference whether be greater than the 3rd preset value, if so, upgrade be stored in ECUThe environment temperature of portion, makes T00＝T01, then enter step S2; Otherwise enter step S2.
Optionally, before step S2, also further increase following steps:
S22, judge whether that new urea liquid injects urea box, if had, detect and injectUrea liquid temperature T in urea box after urea liquid2, and upgrade the urine that is stored in ECU insideCellulose solution temperature, makes T0＝T2, then enter step S2; Otherwise enter step S2.
Optionally, between step S1 and step S2, also further increase following steps:
S42, judge the height of the inner urea liquid of urea box according to urea liquid altitude signal,If current urea liquid height h >=0.05*H, enters step S2; If current urea is moltenLiquid height h < 0.05*H, termination routine;
Wherein, height when H is urea box splendid attire urea liquid maximum.
Optionally, between step S1 and step S2, also further increase following steps:
S01, according to environment temperature sensor, urea box temperature sensor, urea level sensingThe voltage signal that device is passed to ECU judges described environment temperature sensor, described urea box temperatureThe detection voltage of sensor, described urea liquid level sensor whether in effective range, ifAll, in effective range, enter step S2; Otherwise, termination routine;
Wherein, environment temperature sensor is for detection of environment temperature, and urea box temperature sensor is usedIn detecting urea liquid temperature.
Optionally, step S2 is specially:
The temperature T of the urea liquid of urea box inside described in S201, detection current time1；
S202, judge T00With the size of critical-temperature T, if T00>=T, continues judgementT1Whether be greater than the first preset value or T1-T0Whether be more than or equal to the second preset value, if whereinOne judged result is yes, exports the control instruction of cooling fluid solenoid valve failure;
If T00< T, continues to judge T1Whether be greater than the 4th preset value or T1-T0Whether largeIn equaling the 5th preset value, if wherein one judged result is yes, export cooling fluid electromagnetismThe control instruction of valve fault;
Wherein, the span of described critical-temperature T is :-20 DEG C to-10 DEG C; Described firstThe span of preset value is: 50 DEG C-60 DEG C; The span of described the second preset value is: 15 DEG C-25 DEG C; The span of described the 4th preset value is: 35 DEG C-45 DEG C; Described the 5th preset valueValue be: ︳ T00︳。
Optionally, described critical-temperature T is-15 DEG C; Described the first preset value is 55 DEG C; InstituteStating the second preset value is: 20 DEG C; The value of described the 4th preset value is: 40 DEG C.
Optionally, when exporting cooling fluid solenoid valve failure control instruction in step S2, alsoOutput display instruction simultaneously, the demonstration arranging in described idsplay order control vehicle OBD systemParts send display.
In addition, the present invention also provides a kind of SCR system cools liquid electromagnetic valve fault detect dressPut, this device specifically comprises:
Urea box temperature sensor, detects the urea liquid of urea box inside described in current timeTemperature T1；
ECU, environment temperature T under the original state that prestores00, urea box inside urea liquid temperatureT0; And, judge the environment temperature T in above-mentioned ECU storage00Under, T1Whether be greater than firstPreset value or T1-T0Whether be more than or equal to the second preset value, if wherein one judged result isTo export cooling fluid solenoid valve failure control instruction.
Brief description of the drawings
Fig. 1 is SCR system cools liquid electromagnetic valve fault detect in a kind of specific embodiment of the present inventionThe part FB(flow block) of method;
Fig. 2 is SCR system cools liquid electromagnetic valve fault detect in a kind of specific embodiment of the present inventionAnother part FB(flow block) of method;
Fig. 3 is SCR system cools liquid electromagnetic valve fault detection method in the specific embodiment of the inventionPart FB(flow block).
Detailed description of the invention
Core of the present invention for provide a kind of SCR system cools liquid electromagnetic valve fault detection method,Checkout gear, the method can be found the not tight phenomenon of cooling fluid magnetic valve clamping stagnation or closure in time, keeps awayExempt from urea liquid and cross thermal metamorphism, and improve engine power performance.
In order to make those skilled in the art understand better technical scheme of the present invention, below thisLiterary composition is in conjunction with SCR system cools liquid electromagnetic valve failure detector, detection method, accompanying drawing and concreteThe present invention is described in further detail for embodiment.
Please refer to Fig. 1 and Fig. 2, Fig. 1 is that in a kind of specific embodiment of the present invention, SCR system is coldBut the part FB(flow block) of liquid electromagnetic valve fault detection method; Fig. 2 is that the present invention is a kind of concrete realExecute another part FB(flow block) of SCR system cools liquid electromagnetic valve fault detection method in example. Figure1 and the flow process of the SCR system cools liquid electromagnetic valve fault detection method being combined as of Fig. 2Figure, for clear demonstration, will complete flow chart herein and be divided into two parts.
The invention provides a kind of for SCR (English full name: selectivecatalyticReductiontechnology, SCR technology, hereinafter to be referred as SCR) system coolsLiquid electromagnetic valve fault detection method, the method is specially:
S0, ECU initialize;
Environment temperature T under S1, the original state that prestores00, urea box inside urea liquid temperatureT0To ECU (English full name: ElectronicControlUnit, engine electric-controlled unit, withLower abbreviation ECU).
Particularly, environment temperature T under original state00Refer to external environment temperature when vehicle has just startedDegree, environment temperature T00, urea liquid temperature T0Can be respectively by being arranged at the ring on vehicleBorder temperature sensor and the urea box temperature sensor being arranged in urea box obtain.
In addition, environment temperature sensor and urea box temperature sensor and circuit thereof are in use procedureIn there will be unavoidably fault, if environment temperature sensor and urea box temperature sensor can not be justNormal work, directly affects the accuracy of this cooling fluid solenoid valve failure determination methods. Therefore in order to increaseAdd the accuracy of the method failure judgement, reduce other disturbing factors as far as possible, can also carry outBefore the method, the validity of environment temperature sensor and urea box temperature sensor is sentencedDisconnected, if environment temperature sensor and urea box temperature sensor are all effective, proceed withLower step, otherwise finish this judgement flow process, as long as environment temperature sensor and urea box temperatureA kind of appearance of sensor is non-effective, just finishes this flow process judgement. Validity as herein described refers toNormal work.
Wherein, the judgement of the validity of environment temperature sensor and urea temperature sensor can foundationFollowing methods. This validity judgement can, before S1, also can enter S2 after S1Before. In Fig. 1, illustrate and be located at step S1 detailed description of the invention before.
S011, according to environment temperature sensor, urea box temperature sensor, urea level sensingThe voltage signal that device is passed to ECU judges environment temperature sensor, described urea box TEMPWhether the detection voltage of device, described urea liquid level sensor is in effective range, if all locatedIn effective range, enter step S1; Otherwise, carry out S012;
S012, termination routine.
That is to say, ECU judges that by the voltage signal receiving this magnitude of voltage is whether in normallyIn value range, if in normal range value, think that this temperature sensor normally works,If exceed normal range value, think temperature sensor non-normal working.
For for the vehicle in environment more complicated, the residing environment temperature of different timePossible Temperature Difference Ratio is larger, and for example vehicle, may be residing in the time that initial start stage ECU initializesEnvironment temperature is-15 DEG C, but through travelling after a while, travelling into environment temperature isIn the environment of 0 DEG C, simply understanding, is exactly that vehicle You Han district runs into hot-zone always, in this processMiddle ECU did not break electric, was now stored in the environment temperature still-1 in ECU5 DEG C, taking-15 DEG C as according to judgement, must cause decision logic report if now continuedMistake, causes erroneous judgement. Therefore, in order to improve cooling fluid solenoid valve failure detection efficiency, can also increaseJudged:
S121, real-time testing environment temperature T01, judge environment temperature T01Prestore with ECUEnvironment temperature T00Difference whether be greater than the 3rd preset value, if so, execution step S122;Otherwise, directly perform step S2;
S122, renewal are stored in the environment temperature of ECU storage inside, make T00＝T01。
The 3rd preset value can be selected 5-15 DEG C of scope, and in Fig. 1, the 3rd preset value is10 DEG C. If environment temperature T01The environment temperature T prestoring with ECU00Difference be less than the 3rdPreset value, can continue the T with the former ECU of being stored in inside00As basis for estimation.
In addition, except above across the larger situation of Temperature Difference Ratio, vehicle in the time not stopping in order to meetVehicle operation demand, operating personnel may also can increase urea liquid to urea box inside, butTemperature is not identical with the surplus solution temperature in urea box sometimes for the urea liquid increasing,Or both solution differ larger, for example, when newly-increased urea liquid temperature is higher, urine after mixingCellulose solution temperature there will be the phenomenon that temperature increasing degree is larger. For avoiding above-mentioned situation to occurErroneous judgement, can also increase to judge.
S221, judge whether that new urea liquid injects urea box, if had, execution stepS222; Otherwise, directly perform step S2;
Urea liquid temperature T in urea box after S222, detection injection urea liquid2, and upgrade and depositThe urea liquid temperature that is stored in ECU inside, makes T0＝T2；
Whether wherein, have new urea liquid to inject the judgement of urea box can be according in the unit intervalIn urea box, whether the height of urea liquid changes.
Moreover, if the height of the inner urea liquid of urea box is lower than the position of urea temperature sensorPut, although now urea temperature sensor still can transmit temperature signal, and ECU nowAlso judge that this temperature sensor is also in normal operating conditions, but urea temperature sensor nowWhat detect is urea box Inside Air Temperature, and is not the temperature of urea liquid, will cause inspectionSurvey signal and occur error. Therefore in order to eliminate the impact of this factor, can also carry out herein simultaneously withJudge.
S421, judge the height of the inner urea liquid of urea box, if current urea liquid heightH >=0.05*H, enters step S2; If current urea liquid height h < 0.05*H, holdsRow step S422;
S422, termination routine.
Wherein, height when H is urea box splendid attire urea liquid maximum.
In general urea box, liquid level sensor is also installed, for urea liquid in perception urea boxAltitude signal, ECU can judge according to this altitude signal the height of the inner urea liquid of urea boxDegree.
After above-mentioned a series of judgement, make the following judgment carrying out:
The temperature T of the urea liquid of urea box inside described in S2, detection current time1; JudgeThe environment temperature T of above-mentioned ECU storage00Under, T1Whether be greater than the first preset value or T1-T0BeNoly be more than or equal to the second preset value, if wherein one judged result is yes, export cooling fluidSolenoid valve failure control instruction.
Further, in order accurately to judge cooling fluid solenoid valve failure, can also divide different ringsBorder temperature province, sets the first different preset values and the second preset value, has below provided divisionTwo embodiments that varying environment temperature province judges.
The temperature T of the urea liquid of urea box inside described in S201, detection current time1；
S202, judge T00With the size of critical-temperature T, if T00>=T, execution stepS203; If T00< T, performs step S204;
S203, continuation judge T1Whether be greater than the first preset value or T1-T0Whether be more than or equal toTwo preset values, if wherein one judged result is yes, perform step S205;
S204, judge T1Whether be greater than the 4th preset value or T1-T0Whether be more than or equal to the 5th pre-If value, if wherein one judged result is yes, performs step S205;
The control instruction of S205, output cooling fluid solenoid valve failure;
Wherein, the span of described critical-temperature T is :-20 DEG C to-10 DEG C; Described firstThe span of preset value is: 50 DEG C-60 DEG C; The span of described the second preset value is: 15 DEG C-25 DEG C; The span of described the 4th preset value is: 35 DEG C-45 DEG C; Described the 5th preset valueValue be: ︳ T00︳。
In a kind of detailed description of the invention, critical-temperature T can be-15 DEG C; Described first is defaultValue can be 55 DEG C; Described the second preset value can be: 20 DEG C; Described the 4th preset valueValue can be: 40 DEG C.
Please refer to Fig. 3, Fig. 3 has provided the part determining step of the detection method under above-mentioned parameter.
Certainly, those skilled in that art understand, and environment temperature region can Further Division beMore interval, obtain judgement more accurately.
In order to make the judged result of the above-mentioned cooling fluid magnetic valve of the vivider understanding of human pilot, stepWhen exporting cooling fluid solenoid valve failure control instruction in rapid S2, also output display refers to simultaneouslyOrder, the display unit arranging in idsplay order control vehicle OBD system sends display,Perform step S205 and carry out following steps S206 simultaneously.
S206, output display instruction, what in idsplay order control vehicle OBD system, arrange is aobviousShow that parts send display.
Display unit can be display lamp, and it is luminous or extinguish that idsplay order can be controlled display lamp,Thereby alert cooling fluid solenoid valve failure; Certainly display unit can be also acoustic control portionPart, acoustic control parts are by sounding the alarm, alert cooling fluid solenoid valve failure.
The detection method that provided is herein for cooling fluid magnetic valve hardware deficiency, by arrangingThe parameters such as rational environment temperature, urea liquid temperature, according to urea liquid temperature and temperatureChange difference cooling fluid magnetic valve hardware deficiency is rationally judged, and can be by judged resultReport and submit to driver and point out driver's cooling fluid magnetic valve clamping stagnation or not closed, so as driver andShi Genghuan cooling fluid magnetic valve, is conducive to prevent the pollution of the environment and keeps the good economy of engineProperty and dynamic property.
On the basis of above-mentioned detection method, also provide a kind of SCR system cools liquid electricity hereinMagnet valve failure detector, this device specifically comprises: urea box temperature sensor, detects currentThe temperature T of the urea liquid of urea box inside described in moment1; ECU, storage said temperature parameter,Carry out above determining step and send the control instruction in above steps.
Above to a kind of SCR system cools liquid electromagnetic valve provided by the present invention fault detect sideMethod, checkout gear are described in detail. Apply specific case herein to of the present invention formerReason and embodiment are set forth, and the explanation of above embodiment is just for helping to understand thisBright method and core concept thereof. It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement to the present inventionAnd modification, these improvement and modification also fall in the protection domain of the claims in the present invention.

Claims (9)

1. a SCR system cools liquid electromagnetic valve fault detection method, is characterized in that, shouldMethod is specially:
S0, ECU initialize;
Environment temperature T under S1, the original state that prestores00, urea box inside urea liquid temperatureT0To ECU;
The temperature T of the urea liquid of urea box inside described in S2, detection current time1; JudgeThe environment temperature T of above-mentioned ECU storage00Under, T1Whether be greater than the first preset value or T1-T0BeNoly be more than or equal to the second preset value, if wherein one judged result is yes, export cooling fluidSolenoid valve failure control instruction.
2. SCR system cools liquid electromagnetic valve fault detection method according to claim 1,It is characterized in that, between step S1 and step S2, also further increase following steps:
S12, real-time testing environment temperature T01, judge environment temperature T01The ring prestoring with ECUBorder temperature T00Difference whether be greater than the 3rd preset value, if so, upgrade be stored in ECUThe environment temperature of portion, makes T00＝T01, then enter step S2; Otherwise enter step S2.
3. SCR system cools liquid electromagnetic valve fault detection method according to claim 1,It is characterized in that, before step S2, also further increase following steps:
S22, judge whether that new urea liquid injects urea box, if had, detect and injectUrea liquid temperature T in urea box after urea liquid2, and upgrade the urine that is stored in ECU insideCellulose solution temperature, makes T0＝T2, then enter step S2; Otherwise enter step S2.
4. according to the SCR system cools liquid electromagnetic valve event described in claims 1 to 3 any oneBarrier detection method, is characterized in that, below also further increasing between step S1 and step S2Step:
S42, judge the height of the inner urea liquid of urea box according to urea liquid altitude signal,If current urea liquid height h >=0.05*H, enters step S2; If current urea is moltenLiquid height h < 0.05*H, termination routine;
Wherein, height when H is urea box splendid attire urea liquid maximum.
5. SCR system cools liquid electromagnetic valve fault detection method according to claim 4,It is characterized in that, between step S1 and step S2, also further increase following steps:
S01, according to environment temperature sensor, urea box temperature sensor, urea level sensingThe voltage signal that device is passed to ECU judges described environment temperature sensor, described urea box temperatureThe detection voltage of sensor, described urea liquid level sensor whether in effective range, ifAll, in effective range, enter step S2; Otherwise, termination routine;
Wherein, environment temperature sensor is for detection of environment temperature, and urea box temperature sensor is usedIn detecting urea liquid temperature.
6. SCR system cools liquid electromagnetic valve fault detection method according to claim 1,It is characterized in that, step S2 is specially:
The temperature T of the urea liquid of urea box inside described in S201, detection current time1；
S202, judge T00With the size of critical-temperature T, if T00>=T, continues judgementT1Whether be greater than the first preset value or T1-T0Whether be more than or equal to the second preset value, if whereinOne judged result is yes, exports the control instruction of cooling fluid solenoid valve failure;
If T00< T, continues to judge T1Whether be greater than the 4th preset value or T1-T0Whether largeIn equaling the 5th preset value, if wherein one judged result is yes, export cooling fluid electromagnetismThe control instruction of valve fault;
Wherein, the span of described critical-temperature T is :-20 DEG C to-10 DEG C; Described firstThe span of preset value is: 50 DEG C-60 DEG C; The span of described the second preset value is: 15 DEG C-25 DEG C; The span of described the 4th preset value is: 35 DEG C-45 DEG C; Described the 5th preset valueValue be: ︳ T00︳。
7. SCR system cools liquid electromagnetic valve fault detection method according to claim 6,It is characterized in that, described critical-temperature T is-15 DEG C; Described the first preset value is 55 DEG C; InstituteStating the second preset value is: 20 DEG C; The value of described the 4th preset value is: 40 DEG C.
8. SCR system cools liquid electromagnetic valve fault detection method according to claim 1,It is characterized in that, when exporting cooling fluid solenoid valve failure control instruction in step S2, alsoOutput display instruction simultaneously, the demonstration arranging in described idsplay order control vehicle OBD systemParts send display.
9. a SCR system cools liquid electromagnetic valve failure detector, is characterized in that, shouldDevice specifically comprises:
Urea box temperature sensor, detects the urea liquid of urea box inside described in current timeTemperature T1；
ECU, environment temperature T under the original state that prestores00, urea box inside urea liquid temperatureT0; And, judge the environment temperature T in above-mentioned ECU storage00Under, T1Whether be greater than firstPreset value or T1-T0Whether be more than or equal to the second preset value, if wherein one judged result isTo export cooling fluid solenoid valve failure control instruction.
CN201510964005.0A 2015-12-18 2015-12-18 A kind of SCR system coolant solenoid valve failure detection method, detection device Active CN105604663B (en)

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CN105604663A true CN105604663A (en) 2016-05-25
CN105604663B CN105604663B (en) 2018-07-03

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CN108518265A (en) * 2018-03-29 2018-09-11 潍柴动力股份有限公司 Judge the system and method and automobile of Urea solenoid valve mechanical failure
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