CN105604663B - A kind of SCR system coolant solenoid valve failure detection method, detection device - Google Patents

A kind of SCR system coolant solenoid valve failure detection method, detection device Download PDF

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Publication number
CN105604663B
CN105604663B CN201510964005.0A CN201510964005A CN105604663B CN 105604663 B CN105604663 B CN 105604663B CN 201510964005 A CN201510964005 A CN 201510964005A CN 105604663 B CN105604663 B CN 105604663B
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urea
preset value
temperature
solenoid valve
valve failure
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CN105604663A (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 kind of SCR system coolant solenoid valve failure detection method, detection device, this method is specially：First, ECU is initialized, and environment temperature T under the original state that prestores00, urea solution temperature T inside urea box0To ECU；Secondly, the temperature T of the urea liquid described in current time inside urea box is detected1；Judge the environment temperature T stored in above-mentioned ECU00Under, T1Whether the first preset value or T are more than1‑T0Whether it is more than or equal to the second preset value, if one of which judging result is yes, exports coolant solenoid valve failure control instruction；The detection method rationally judges coolant solenoid hardware defect according to urea solution temperature and temperature change difference, and it can will determine that result is reported and submitted to driver and driver is prompted to cool down liquid electromagnetic valve clamping stagnation or not closed, so that driver replaces cooling liquid electromagnetic valve in time, be conducive to prevent the pollution of the environment and keep the good economy and dynamic property of engine.

Description

A kind of SCR system coolant solenoid valve failure detection method, detection device
Technical field
The present invention relates to Electromagnetic Control technical field, more particularly to a kind of SCR system coolant solenoid valve failure detection side Method, detection device.
Background technology
For diesel engine as a kind of dynamic power machine, the development for society is made that outstanding contribution, but also result in environment simultaneously Pollution.It is increasingly strict with national legislation, diesel emission is required it is higher and higher, it is simple real by engine technology is improved Existing emission compliance is more and more difficult, introduces SCR aftertreatment system in this case.
SCR system basic functional principle：Exhaust enters in exhaust pipe, while after booster turbine outflow by the row of being mounted on Urea injection unit on tracheae sprays into quantitative aqueous solution of urea in exhaust pipe with mist form, and urea droplets are given up in high temperature Gas effect issues unboiled water solution and pyrolytic reaction, generates required reducing agent ammonia (NH3), ammonia (NH3) in the effect of catalyst The lower main harmful components nitrogen oxides (NO by diesel exhaust gasx) selectively it is reduced to nitrogen (N2).SCR system is just Normal job requirement urea liquid is liquid condition, but urea liquid characteristic is less than -11 DEG C icings that will freeze, in order to ensure SCR system works normally, and SCR system increases Urea function.When urea is there are during risk of icing, Urea function opens It is dynamic, it is heated respectively to urea box, urea pump and urea pipe, it is liquid condition to ensure urea liquid.
Coolant electromagnetic valve switch both ends connect plastic flexible pipe, and hose is connected respectively to engine body and urea box heating U-tube interface exports high-low voltage by ECU to control the unlatching of water valve valve, the low temperature urea in urea box is carried out Heating ensures that urea is liquid condition in SCR system normal work.Since coolant electromagnetic valve switch is simple open and close valve , the impurity in engine coolant easily causes the clamping stagnation of coolant electromagnetic valve switch, and the valve is with continuous in addition Abrasion, valve, which is closed not tight situation, to be occurred.
Once there is a situation where coolant electromagnetic valve switch valve closure is not tight, this can not be avoided from the angle ECU of control Class problem, the coolant of engine constantly will heat U-tube to Urea by urea box.The temperature that urea liquid goes bad is big It it is approximately 75 DEG C, if engine coolant temperature, for a long time in 80 DEG C or more, urea liquid will go bad, and urea goes bad itself It just pollutes the environment while can not Reduction of NOx, cause engine emission exceeded.
Also, especially in cold district, since Engine Inlet Temperature and cooling water temperature are very low, engine natively opens Dynamic difficulty if there is coolant electromagnetic valve switch clamping stagnation or is closed not tight situation, and the startup for making engine is more difficult；When When there are coolant electromagnetic valve switch clamping stagnation or being closed not tight failure, the heat of fuel oil burning release has quite a few to add Hot urea liquid rather than acting cause the dynamic property of engine to be deteriorated, while engine start Oil Consumption increases, engine Fuel economy is deteriorated.
Therefore how to find cooling liquid electromagnetic valve clamping stagnation in time or be closed not tight phenomenon, urea liquid is avoided to cross thermal metamorphism, with And engine power performance is improved, it is the technical issues of those skilled in that art are urgently to be resolved hurrily.
Invention content
The purpose of the present invention is provides a kind of SCR system coolant solenoid valve failure detection method, detection device, this method Cooling liquid electromagnetic valve clamping stagnation can be found in time or is closed not tight phenomenon, and urea liquid is avoided to cross thermal metamorphism and improves engine Power performance.
In order to solve the above technical problems, the present invention provides a kind of SCR system coolant solenoid valve failure detection method, the party Method is specially：
S0, ECU are initialized；
Environment temperature T under S1, the original state that prestores00, urea solution temperature T inside urea box0To ECU；
The temperature T of urea liquid described in S2, detection current time inside urea box1；Judge the ring stored in above-mentioned ECU Border temperature T00Under, T1Whether the first preset value or T are more than1-T0Whether the second preset value is more than or equal to, if one of which judges As a result it is yes, then exports coolant solenoid valve failure control instruction.
Detection method presented herein is directed to coolant solenoid hardware defect, by setting rational environment temperature The parameters such as degree, urea solution temperature, according to urea solution temperature and temperature change difference to coolant solenoid hardware defect Rationally judged, and can will determine that result is reported and submitted to driver and driver is prompted to cool down liquid electromagnetic valve clamping stagnation or not closed, So that driver replaces cooling liquid electromagnetic valve in time, be conducive to prevent the pollution of the environment and keep the good economy of engine and move Power.
Optionally, following steps are also further increased between step S1 and step S2：
S12, in real time detection environment temperature T01, judge environment temperature T01The environment temperature T to prestore with ECU00Difference whether More than third preset value, if so, updating storage the environment temperature inside ECU, make T00=T01, subsequently into step S2；It is no Then enter step S2.
Optionally, following steps are also further increased before step S2：
S22, new urea liquid injection urea box is judged whether there is, if so, urea box after detection injection urea liquid Interior urea solution temperature T2, and the urea solution temperature inside ECU is updated storage, make T0=T2, subsequently into step S2；It is no Then enter step S2.
Optionally, following steps are also further increased between step S1 and step S2：
S42, the height that urea liquid inside urea box is judged according to urea liquid altitude signal, if current urea liquid Height h >=0.05*H, then enter step S2；If current urea liquid height h ＜ 0.05*H, terminate program；
Wherein, H is height when urea box contains urea liquid maximum.
Optionally, following steps are also further increased between step S1 and step S2：
S01, the voltage that ECU is transferred to according to environment temperature sensor, urea box temperature sensor, urea liquid level sensor Signal judges the detection voltage of the environment temperature sensor, the urea box temperature sensor, the urea liquid level sensor Whether in effective range, if be in effective range, S2 is entered step；Otherwise, terminate program；
Wherein, for detecting environment temperature, urea box temperature sensor is used to detect urea liquid environment temperature sensor Temperature.
Optionally, step S2 is specially：
The temperature T of urea liquid described in S201, detection current time inside urea box1；
S202, judge T00With the size of critical-temperature T, if T00>=T then continues to judge T1Whether the first preset value is more than Or T1-T0Whether it is more than or equal to the second preset value, if one of which judging result is yes, exports coolant solenoid valve failure Control instruction；
If T00＜ T then continue to judge T1Whether the 4th preset value or T are more than1-T0Whether the 5th preset value is more than or equal to, If one of which judging result is yes, the control instruction of coolant solenoid valve failure is exported；
Wherein, the value range of the critical-temperature T is：- 20 DEG C to -10 DEG C；The value range of first preset value For：50℃-60℃；The value range of second preset value is：15℃-25℃；The value range of 4th preset value is： 35℃-45℃；The value of 5th preset value is：︳ T00︳.
Optionally, the critical-temperature T is -15 DEG C；First preset value is 55 DEG C；Second preset value is：20 ℃；The value of 4th preset value is：40℃.
Optionally, while coolant solenoid valve failure control instruction is exported in step S2, idsplay order also is exported simultaneously, The display unit set in the idsplay order control vehicle OBD system sends out display signal.
In addition, the present invention also provides a kind of SCR system coolant solenoid valve failure detection device, which specifically wraps It includes：
Urea box temperature sensor detects the temperature T of the urea liquid described in current time inside urea box1；
ECU, environment temperature T under the original state that prestores00, urea solution temperature T inside urea box0；Also, judge upper State the environment temperature T of ECU storages00Under, T1Whether the first preset value or T are more than1-T0Whether the second preset value is more than or equal to, if One of which judging result is yes, then exports coolant solenoid valve failure control instruction.
Description of the drawings
Fig. 1 is the part flow of SCR system coolant solenoid valve failure detection method in a kind of specific embodiment of the present invention Block diagram；
Fig. 2 is another part of SCR system coolant solenoid valve failure detection method in a kind of specific embodiment of the present invention Flow diagram；
Fig. 3 is the part flow diagram of SCR system coolant solenoid valve failure detection method in the specific embodiment of the invention.
Specific embodiment
The core of the present invention is provides a kind of SCR system coolant solenoid valve failure detection method, detection device, this method Cooling liquid electromagnetic valve clamping stagnation can be found in time or is closed not tight phenomenon, and urea liquid is avoided to cross thermal metamorphism and improves engine Power performance.
In order to which those skilled in the art is made to more fully understand technical scheme of the present invention, below herein in conjunction with SCR system Coolant solenoid valve failure detection device, detection method, the present invention is described in further detail for the drawings and specific embodiments.
It please refers to Fig.1 and Fig. 2, Fig. 1 is detected for SCR system coolant solenoid valve failure in a kind of specific embodiment of the present invention The part flow diagram of method；Fig. 2 is SCR system coolant solenoid valve failure detection method in a kind of specific embodiment of the present invention Another part flow diagram.The stream of the SCR system coolant solenoid valve failure detection method for being combined as completing of Fig. 1 and Fig. 2 Cheng Tu is shown for clarity, will be completed flow chart herein and is divided into two parts.
The present invention provides one kind to be used for SCR (English full name：selective catalytic reduction Technology, hereinafter referred to as SCR technology, SCR) system coolant solenoid valve failure detection method, this method Specially：
S0, ECU are initialized；
Environment temperature T under S1, the original state that prestores00, urea solution temperature T inside urea box0To ECU (English full name： Electronic Control Unit, hereinafter referred to as engine electric-controlled unit, ECU).
Specifically, environment temperature T under original state00Refer to ambient temperature when vehicle just starts, environment temperature T00、 Urea solution temperature T0The environment temperature sensor being set on vehicle and the urea being set in urea box can be passed through respectively Case temperature sensor obtains.
In addition, environment temperature sensor and urea box temperature sensor and its circuit inevitably will appear event in use Barrier if environment temperature sensor and urea box temperature sensor cisco unity malfunction, directly affects cooling liquid electromagnetic valve event Hinder the accuracy of judgment method.Therefore in order to increase the accuracy of this method failure judgement, other disturbing factors are reduced as possible, may be used also To judge before this method is carried out the validity of environment temperature sensor and urea box temperature sensor, if environment Temperature sensor and urea box temperature sensor are effective, then continue following steps, otherwise terminate the judgement flow, i.e., only It wants environment temperature sensor and a kind of appearance of urea box temperature sensor non-effective, just terminates flow judgement.It is as described herein Validity refers to work normally.
Wherein, the Effective judgement of environment temperature sensor and urea temperature sensor can be according to following methods.This has Effect property judges can be before S1, before can also entering S2 after S1.It is shown in Fig. 1 specific before step S1 Embodiment.
S011, the electricity that ECU is transferred to according to environment temperature sensor, urea box temperature sensor, urea liquid level sensor Pressure signal judge environment temperature sensor, the urea box temperature sensor, the urea liquid level sensor detection voltage be It is no to be in effective range, if be in effective range, enter step S1；Otherwise, S012 is performed；
S012, terminate program.
That is, ECU judges the voltage value whether in normal range value by the voltage signal of reception, if place In in normal range value, then it is assumed that the temperature sensor works normally, if beyond normal range value, then it is assumed that temperature sensor Non-normal working.
For be in environment it is more complicated in vehicle for, environment temperature residing for different time may the temperature difference compare Greatly, such as vehicle is when initial start stage ECU is initialized, and the environment temperature residing for possibility is -15 DEG C, but through after a period of time Traveling, travelling environment temperature is in 0 DEG C of environment, simple to understand, is exactly that vehicle runs into hot-zone always by Han Qu, herein mistake ECU did not break electricity in journey, i.e., still -15 DEG C of environment temperature being stored at this time in ECU, if continued at this time with -15 DEG C According to judgement, inherently decision logic to be caused to report an error, causing to judge by accident.Therefore in order to improve coolant solenoid valve failure detection effect Rate can also increase following judgement：
S121, in real time detection environment temperature T01, judge environment temperature T01The environment temperature T to prestore with ECU00Difference be It is no to be more than third preset value, if so, performing step S122；Otherwise, step S2 is directly performed；
S122, it updates storage in the environment temperature of ECU storage insides, makes T00=T01。
Third preset value can select 5-15 DEG C of range, and third preset value is 10 DEG C in Fig. 1.If environment temperature T01 The environment temperature T to prestore with ECU00Difference be less than third preset value, then can continue to be stored in T inside ECU with original00Make For basis for estimation.
In addition, except above except in the case of the temperature difference is bigger, vehicle in order to meet vehicle operation demand, is grasped when not parking Urea liquid can may also be increased to urea box inside by making personnel, however increased urea liquid may temperature and urea box sometimes Interior surplus solution temperature simultaneously differs, or both solution difference it is bigger, such as when newly-increased urea solution temperature is higher, mix Urea solution temperature will appear the phenomenon that temperature increasing degree is bigger after conjunction.It, can be with for the above situation is avoided to judge by accident Increase following judgement.
S221, new urea liquid injection urea box is judged whether there is, if so, performing step S222；Otherwise, it directly holds Row step S2；
Urea solution temperature T in urea box after S222, detection injection urea liquid2, and update storage the urine inside ECU Plain solution temperature, makes T0=T2；
Wherein, if the judgement for having new urea liquid injection urea box can be molten according to urea in urea box in the unit interval Whether the height of liquid changes.
Furthermore if urea box inside urea liquid height less than urea temperature sensor position, although at this time urinate Plain temperature sensor remains able to transmit temperature signal, and ECU also judges that the temperature sensor is also at normal work at this time State, but urea temperature sensor detection at this time is urea box Inside Air Temperature, and the not temperature of urea liquid, it will Detection signal can be caused error occur.Therefore in order to eliminate the influence of the factor, it can also be carried out at the same time following judgement herein.
S421, the height for judging urea liquid inside urea box, if current urea liquid height h >=0.05*H, into Enter step S2；If current urea liquid height h ＜ 0.05*H, perform step S422；
S422, terminate program.
Wherein, H is height when urea box contains urea liquid maximum.
Liquid level sensor is also equipped in general urea box, for perceiving the altitude signal of urea liquid in urea box, ECU The height of urea liquid inside urea box can be judged according to the altitude signal.
After a series of above-mentioned judgements are carried out, make the following judgment：
The temperature T of urea liquid described in S2, detection current time inside urea box1；Judge the ring stored in above-mentioned ECU Border temperature T00Under, T1Whether the first preset value or T are more than1-T0Whether the second preset value is more than or equal to, if one of which judges As a result it is yes, then exports coolant solenoid valve failure control instruction.
Further, in order to accurately judge coolant solenoid valve failure, varying environment temperature region can also be divided, is set Different the first preset values and the second preset value, following present the implementations that two varying environment temperature regions of division are judged Mode.
The temperature T of urea liquid described in S201, detection current time inside urea box1；
S202, judge T00With the size of critical-temperature T, if T00>=T then performs step S203；If T00＜ T, then hold Row step S204；
S203, continue to judge T1Whether the first preset value or T are more than1-T0Whether the second preset value is more than or equal to, if its Middle one judging result is yes, then performs step S205；
S204, judge T1Whether the 4th preset value or T are more than1-T0Whether the 5th preset value is more than or equal to, if wherein one Person's judging result is yes, then performs step S205；
S205, the control instruction for exporting coolant solenoid valve failure；
Wherein, the value range of the critical-temperature T is：- 20 DEG C to -10 DEG C；The value range of first preset value For：50℃-60℃；The value range of second preset value is：15℃-25℃；The value range of 4th preset value is： 35℃-45℃；The value of 5th preset value is：︳ T00︳.
In a kind of specific embodiment, critical-temperature T can be -15 DEG C；First preset value can be 55 DEG C；Institute Stating the second preset value can be：20℃；The value of 4th preset value can be：40℃.
It please refers to Fig.3, Fig. 3 gives the part judgment step of the detection method under above-mentioned parameter.
Certainly, those skilled in that art understand, environment temperature region can be further divided into more sections, obtain It is more accurate to judge.
For the judging result of the above-mentioned cooling liquid electromagnetic valve of understanding for making driver vivider, cooling is exported in step S2 While liquid electromagnetic valve Fault Control instructs, idsplay order is also exported simultaneously, is set in idsplay order control vehicle OBD system Display unit sends out display signal, that is, performs step S205 and be performed simultaneously following steps S206.
S206, output idsplay order, idsplay order control the display unit set in vehicle OBD system to send out display letter Number.
Display unit can be display lamp, and idsplay order can control display lamp to shine or extinguish, so as to prompt operator Member's coolant solenoid valve failure；Certain display unit may be acoustic control component, and acoustic control component prompts behaviour by sounding the alarm Make personnel's coolant solenoid valve failure.
Detection method presented herein is directed to coolant solenoid hardware defect, by setting rational environment temperature The parameters such as degree, urea solution temperature, according to urea solution temperature and temperature change difference to coolant solenoid hardware defect Rationally judged, and can will determine that result is reported and submitted to driver and driver is prompted to cool down liquid electromagnetic valve clamping stagnation or not closed, So that driver replaces cooling liquid electromagnetic valve in time, be conducive to prevent the pollution of the environment and keep the good economy of engine and move Power.
On the basis of above-mentioned detection method, a kind of SCR system coolant solenoid valve failure detection dress is also provided herein It puts, which specifically includes：Urea box temperature sensor detects the temperature of the urea liquid described in current time inside urea box T1；ECU stores above-mentioned temperature parameter, carries out more than judgment step and sends out the control instruction in above steps.
A kind of SCR system coolant solenoid valve failure detection method provided by the present invention, detection device are carried out above It is discussed in detail.Specific case used herein is expounded the principle of the present invention and embodiment, above example Explanation be merely used to help understand the present invention method and its core concept.It should be pointed out that for the common of the art For technical staff, without departing from the principle of the present invention, can also to the present invention some improvement and modification can also be carried out, these Improvement and modification are also fallen within the protection scope of the claims of the present invention.

Claims (8)

1. a kind of SCR system coolant solenoid valve failure detection method, which is characterized in that this method is specially：
S0, ECU are initialized；
Environment temperature T under S1, the original state that prestores00, urea solution temperature T inside urea box0To ECU；
The temperature T of urea liquid described in S2, detection current time inside urea box1；Judge the environment temperature stored in above-mentioned ECU Spend T00Under, T1Whether the first preset value or T are more than1-T0Whether the second preset value is more than or equal to, if one of which judging result It is yes, then exports coolant solenoid valve failure control instruction；
Step S2 is specially：
The temperature T of urea liquid described in S201, detection current time inside urea box1；
S202, judge T00With the size of critical-temperature T, if T00>=T then continues to judge T1Whether be more than the first preset value or T1-T0Whether it is more than or equal to the second preset value, if one of which judging result is yes, exports coolant solenoid valve failure Control instruction；
If T00＜ T then continue to judge T1Whether the 4th preset value or T are more than1-T0Whether the 5th preset value is more than or equal to, if One of which judging result is yes, then exports the control instruction of coolant solenoid valve failure；
Wherein, the value range of the critical-temperature T is：- 20 DEG C to -10 DEG C；The value range of first preset value is：50 ℃-60℃；The value range of second preset value is：15℃-25℃；The value range of 4th preset value is：35℃- 45℃；The value of 5th preset value is：︳ T00︳.
2. SCR system coolant solenoid valve failure detection method according to claim 1, which is characterized in that step S1 and Following steps are also further increased between step S2：
S12, in real time detection environment temperature T01, judge environment temperature T01The environment temperature T to prestore with ECU00Difference whether be more than Third preset value if so, updating storage the environment temperature inside ECU, makes T00=T01, subsequently into step S2；Otherwise into Enter step S2.
3. SCR system coolant solenoid valve failure detection method according to claim 1, which is characterized in that step S2 it It is preceding also to further increase following steps：
S22, new urea liquid injection urea box is judged whether there is, if so, being urinated in urea box after detection injection urea liquid Plain solution temperature T2, and the urea solution temperature inside ECU is updated storage, make T0=T2, subsequently into step S2；Otherwise into Enter step S2.
4. SCR system coolant solenoid valve failure detection method according to any one of claims 1 to 3, which is characterized in that Following steps are also further increased between step S1 and step S2：
S42, the height that urea liquid inside urea box is judged according to urea liquid altitude signal, if current urea liquid height H >=0.05*H then enters step S2；If current urea liquid height h ＜ 0.05*H, terminate program；
Wherein, H is height when urea box contains urea liquid maximum.
5. SCR system coolant solenoid valve failure detection method according to claim 4, which is characterized in that step S1 and Following steps are also further increased between step S2：
S01, the voltage signal that ECU is transferred to according to environment temperature sensor, urea box temperature sensor, urea liquid level sensor Judge the environment temperature sensor, the urea box temperature sensor, the urea liquid level sensor detection voltage whether In effective range, if be in effective range, S2 is entered step；Otherwise, terminate program；
Wherein, for detecting environment temperature, urea box temperature sensor is used to detect urea solution temperature environment temperature sensor.
6. SCR system coolant solenoid valve failure detection method according to claim 1, which is characterized in that described critical Temperature T is -15 DEG C；First preset value is 55 DEG C；Second preset value is：20℃；The value of 4th preset value For：40℃.
7. SCR system coolant solenoid valve failure detection method according to claim 1, which is characterized in that in step S2 While exporting coolant solenoid valve failure control instruction, idsplay order, the idsplay order control vehicle OBD are also exported simultaneously The display unit set in system sends out display signal.
8. a kind of SCR system coolant solenoid valve failure detection device, which is characterized in that the device specifically includes：
Urea box temperature sensor detects the temperature T of the urea liquid described in current time inside urea box1；
ECU, environment temperature T under the original state that prestores00, urea solution temperature T inside urea box0；Also, judge T00With it is critical The size of temperature T, if T00>=T then continues to judge T1Whether the first preset value or T are more than1-T0Whether second is more than or equal to pre- If value, if one of which judging result is yes, exports the control instruction of coolant solenoid valve failure；If T00＜ T, then after It is continuous to judge T1Whether the 4th preset value or T are more than1-T0Whether the 5th preset value is more than or equal to, if one of which judging result is It is then to export the control instruction of coolant solenoid valve failure；Wherein, the value range of the critical-temperature T is：- 20 DEG C to -10 ℃；The value range of first preset value is：50℃-60℃；The value range of second preset value is：15℃-25℃； The value range of 4th preset value is：35℃-45℃；The value of 5th preset value is：︳ T00︳.
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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