CN109139208A - A kind of temperature sensor patches abnormal detection method, a kind of engine and vehicle - Google Patents
A kind of temperature sensor patches abnormal detection method, a kind of engine and vehicle Download PDFInfo
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- CN109139208A CN109139208A CN201811142963.XA CN201811142963A CN109139208A CN 109139208 A CN109139208 A CN 109139208A CN 201811142963 A CN201811142963 A CN 201811142963A CN 109139208 A CN109139208 A CN 109139208A
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- temperature sensor
- temperature
- exhaust gas
- engine
- exhaust
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating or supervising devices
-
- 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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
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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
- 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
Abstract
The invention discloses a kind of temperature sensors to patch abnormal detection method, a kind of engine and vehicle.Whether at least two exhaust gas temperature sensors and at least two exhaust gas temperature sensor connectors that the detection method is used to detect in gas exhaust piping patch correctly；At least two exhaust gas temperature sensors include the upstream exhaust temperature sensor close to engine side and the downstream exhaust gas temperature sensor far from engine side；The detection method includes: to judge whether engine is cold start according to the start-up parameter of engine；If so, judging whether engine meets testing conditions according to detection parameters；If so, judging whether the temperature of upstream exhaust temperature sensor is greater than the temperature of downstream exhaust gas temperature sensor；If it is not, output exhaust gas temperature sensor patches abnormal pre-warning signal.Exhaust gas temperature sensor detection method provided in this embodiment can accurately detect whether there is a situation where that exhaust gas temperature sensor patches mistake under cold start and testing conditions.
Description
Technical field
The present embodiments relate to engine detection technique fields more particularly to a kind of temperature sensor to patch abnormal inspection
Survey method, a kind of engine and vehicle.
Background technique
For the diesel engine of six discharge phase of Europe, the after-treatment system of diesel engine generally includes at least diesel oxidation catalyst
(Diesel Oxidation Catalyst, DOC), grain catcher (Diesel Particulate Filter, DPF) and choosing
Selecting property catalysis reduction (Selective Catalytic Reduction, SCR) system etc., to realize to DOC, DPF, SCR system
Detect and control, need DOC upstream install DOC upstream exhaust temperature sensor, need DPF upstream install DPF
Upstream exhaust temperature sensor is needed to install SCR system upstream exhaust temperature sensor in the upstream of SCR system, be needed in SCR
The downstream of system is installed by SCR downstream exhaust gas temperature sensor.
In general, comprehensively considering factors, above-mentioned four kinds of temperature sensors such as difficult type selecting, cost control and modularization can select
Select identical model.Since the appearance of each sensor is identical, each delivery temperature sensing is installed on the vehicle of narrow space
When device, each exhaust gas temperature sensor and wire harness connector happen occasionally to the case where wrong plug mistake.Since each delivery temperature senses
The electric parameter of device is identical, and electronic control unit can not detect whether each sensor patches correctly using conventional detection means.
Mistake is patched if there is exhaust gas temperature sensor, then will lead to DOC, DPF or SCR system can not work normally.
Illustratively, DPF is used to carry out gasification process to the carbon particle in gas exhaust piping, if delivery temperature corresponding with DPF senses
Device patches mistake, and the collected DPF upstream exhaust temperature sensor of electronic control unit may temperature more actual than the upstream DPF
Height, at this point, electronic control unit, which calculates obtained carbon particle processing speed according to DPF, is higher than actual carbon particle processing speed
Degree, electronic control unit think that the aggregation of the carbon particle in gas exhaust piping is less；Control DPF is handled into more carbon particles, but practical
On, since the temperature of DPF is lower, the expection of electronic control unit is not achieved in carbon particle processing speed, causes actually to assemble
Carbon particle is higher than the carbon particle aggregate amount that electronic control unit obtains.Therefore, assemble in actual carbon particle to after to a certain degree,
Electronic control unit cannot start the work of cleaning carbon particle in time, may cause carbon particle and largely assemble in gas exhaust piping
(for example, after vehicle driving thousands of miles), and will lead to DPF blocking, make vehicle can not normally travel.Since electronic control is single
What member can not detect exhaust gas temperature sensor patches mistake, can not directly detect be out of order in the case where, also will lead to therefore
Hinder the cost of overhaul to increase.
Summary of the invention
The present invention provides a kind of temperature sensor and patches abnormal detection method, a kind of engine and vehicle, for detecting
Whether multiple exhaust gas temperature sensors patch correctly.
In a first aspect, abnormal detection method is patched the embodiment of the invention provides a kind of temperature sensor, for detecting
At least two exhaust gas temperature sensors being installed in the gas exhaust piping of engine are patched at least two exhaust gas temperature sensors
Whether part patches correctly；At least two exhaust gas temperature sensor includes the upstream exhaust temperature close to the engine side
Sensor and downstream exhaust gas temperature sensor far from the engine side, the exhaust gas that the engine generates is from the exhaust
The upstream row of pipeline is to the downstream of the gas exhaust piping；The detection method includes:
Judge whether the engine is cold start according to the start-up parameter of the engine；
If so, judging whether the engine meets testing conditions according to detection parameters；
If so, judging whether the temperature of the upstream exhaust temperature sensor is greater than the downstream exhaust gas temperature sensor
Temperature；
If it is not, output exhaust gas temperature sensor patches abnormal pre-warning signal.
Further, at least two exhaust gas temperature sensor includes oxidizing catalytic device upstream exhaust temperature sensing
Device, grain catcher upstream exhaust temperature sensor, selective catalytic reduction system operating upstream exhaust temperature sensor and selectivity
Catalyst reduction system downstream exhaust gas temperature sensor；It is described from the upstream of the gas exhaust piping to the downstream of the gas exhaust piping
Oxidizing catalytic device upstream exhaust temperature sensor, the grain catcher upstream exhaust temperature sensor, the selectivity are urged
Change reduction system upstream exhaust gas temperature sensor and the selective catalytic reduction system operating downstream exhaust gas temperature sensor is successively arranged
Cloth.
Further, whether the temperature for judging the upstream exhaust temperature sensor is greater than the downstream exhaust gas temperature
The temperature of sensor, comprising:
Detect the temperature of the oxidizing catalytic device upstream exhaust temperature sensor, the grain catcher upstream row temperature
Temperature, the temperature of the selective catalytic reduction system operating upstream exhaust temperature sensor and the selectivity of degree sensor are urged
Change the temperature of reduction system downstream exhaust gas temperature sensor；
It is less than or equal on the grain catcher in the temperature of the oxidizing catalytic device upstream exhaust temperature sensor
The temperature of exhaust gas temperature sensor is swum, the temperature of the grain catcher upstream exhaust temperature sensor is less than or equal to the choosing
The temperature of selecting property catalyst reduction system upstream exhaust temperature sensor, alternatively, in the selective catalytic reduction system operating upstream row
When the temperature of gas temperature sensor is less than or equal to the temperature of the selective catalytic reduction system operating downstream exhaust gas temperature sensor,
Export the abnormal pre-warning signal of the exhaust gas temperature sensor contact.
Further, the start-up parameter includes that environment temperature, coolant temperature and at least two delivery temperature pass
The temperature of sensor；
The start-up parameter according to the engine judges whether the engine is cold start, comprising:
Detect the temperature of the environment temperature, the coolant temperature and at least two exhaust gas temperature sensor；
It is respectively less than in the temperature of the environment temperature, the coolant temperature and at least two exhaust gas temperature sensor
Or it is equal to the first preset value, any exhaust gas temperature sensor and the absolute value of the difference of the environment temperature are less than or equal to
The absolute value of the difference of second preset value, the environment temperature and the coolant temperature is less than or equal to third preset value, with
And the absolute value of the temperature gap between exhaust gas temperature sensor described in any two be less than or equal to four preset values when, judgement
The engine is cold start.
Further, first preset value is 45 DEG C；
Second preset value is 5 DEG C；
The third preset value is 10 DEG C；
4th preset value is 2 DEG C.
Further, the testing conditions include the continuous operating time of the engine after cold start, cold start
The engine at least two exhaust gas temperature sensor after the revolving speed and cold start in the continuous operating time afterwards
Temperature gap after the continuous operating time；
It is described to judge whether the engine meets testing conditions according to detection parameters, comprising:
The engine after detection cold start after the continuous operating time of the engine, cold start is in the company
At least two exhaust gas temperature sensor after revolving speed and cold start in continuous runing time is in the continuous operating time
Temperature gap afterwards；
It is greater than or equal to preset time in the continuous operating time；In the continuous operating time, the engine
Revolving speed perseverance be greater than or equal to preset rotation speed；And after the continuous operating time, the sensing of delivery temperature described in any two
When temperature gap between device is greater than or equal to five preset values, judge that the engine meets testing conditions.
Further, the preset time is 200s；
The preset rotation speed is 500r/min；
5th preset value is 3 DEG C.
Further, the output exhaust gas temperature sensor patches abnormal pre-warning signal, comprising:
By way of lighting trouble light or on instrumentation table show fault-signal, exhaust gas temperature sensor grafting is exported
Abnormal pre-warning signal.
Second aspect the embodiment of the invention also provides a kind of engine, including memory, processor and is stored in described
On memory and in the computer program of processor operation, the processor is realized as above when executing the computer program
It states the described in any item exhaust gas temperature sensors of first aspect and patches abnormal detection method.
The third aspect, the embodiment of the invention also provides a kind of vehicles, including engine described in above-mentioned second aspect.
Exhaust gas temperature sensor detection method provided in an embodiment of the present invention passes through under cold start and testing conditions
It, can using the temperature changing regularity and temperature distributing rule between upstream exhaust temperature sensor and downstream exhaust gas temperature sensor
Accurately to detect whether there is a situation where that exhaust gas temperature sensor patches mistake.
Detailed description of the invention
Fig. 1 is the structural block diagram of gas exhaust piping and electronic control unit provided in an embodiment of the present invention；
Fig. 2 be detection exhaust gas temperature sensor provided in an embodiment of the present invention patch whether Yi Chang flow chart；
Fig. 3 is the method flow diagram of the temperature of detection upstream and downstream exhaust gas temperature sensor provided in an embodiment of the present invention；
Fig. 4 is the flow chart provided in an embodiment of the present invention for judging engine and whether meeting cold start；
Fig. 5 is the flow chart provided in an embodiment of the present invention for judging engine and whether meeting testing conditions.
Specific embodiment
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 limiting 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.
Fig. 1 is the structural block diagram of gas exhaust piping and electronic control unit provided in an embodiment of the present invention.Specifically, it please refers to
Fig. 1, electronic control unit 101 are connect by the first harness 103 and the second harness 104 with gas exhaust piping 102.What engine generated
Tail gas will be discharged from the upstream of gas exhaust piping 102 to the downstream of gas exhaust piping 102 in X direction.One end of first harness 103 and electricity
The first input port 111 of sub-control unit 101 is fixedly connected, and the other end is connect with upstream exhaust temperature sensor 112, upstream
Exhaust gas temperature sensor 112 can be installed on the upstream of gas exhaust piping 102, for detecting the upstream temperature of gas exhaust piping 102.The
One end of two harness 104 is fixedly connected with the second input port 121 of electronic control unit 101, the other end and downstream row temperature
It spends sensor 122 to connect, downstream exhaust gas temperature sensor can be installed on the downstream of gas exhaust piping 102, for detecting exhaust pipe
The downstream temperature on road 102.The temperature signal that first port 111 receives is regarded as upstream row temperature by electronic control unit 101
The temperature signal that second port 121 receives, is regarded as the temperature of downstream exhaust gas temperature sensor by the temperature for spending sensor.Such as
When upstream exhaust temperature sensor 112 and reversed downstream exhaust gas temperature sensor 122, downstream exhaust gas temperature sensor provides fruit
Temperature signal will enter electronic control unit 101 from first port 111, and lead to electronic control unit along the first harness 103
Temperature of the 101 wrong temperature by downstream exhaust gas temperature sensor as upstream exhaust temperature sensor.
In view of this, abnormal detection method is patched the embodiment of the invention provides a kind of temperature sensor, for detecting
At least two exhaust gas temperature sensors being installed in the gas exhaust piping of engine are patched at least two exhaust gas temperature sensors
Whether part patches correctly；At least two exhaust gas temperature sensors include close to engine side upstream exhaust temperature sensor and
Downstream exhaust gas temperature sensor far from engine side, the exhaust gas that engine generates is from the upstream row of gas exhaust piping to exhaust pipe
The downstream on road.Fig. 2 be exhaust gas temperature sensor provided in an embodiment of the present invention patch whether Yi Chang flow chart.Specifically, it asks
With reference to Fig. 2, which includes:
Step 10 judges whether engine is cold start according to the start-up parameter of engine.
Specifically, before engine cold start, multiple exhaust gas temperature sensors on gas exhaust piping are usually and engine
Around environment temperature relatively, engine cold start for a period of time after, multiple delivery temperatures on gas exhaust piping pass
The temperature of sensor can rise to higher temperature within a certain period of time.Utilize exhaust gas temperature sensor before and after engine cold start
Temperature change, whether correct can detecte patching for multiple exhaust gas temperature sensors.
If so, thening follow the steps 20, judging whether engine meets testing conditions according to detection parameters.
Specifically, after engine cold start, if engine continuous steadily works a period of time, with exhaust pipe
The tail gas of road discharge gradually increases, and the temperature of gas exhaust piping also increases.If engine is very short after cold start
Interior to stop working once more, then the temperature of gas exhaust piping can't occur significantly to change.By setting testing conditions, it can be determined that
Whether stable working condition is continuously in after engine cold start.After meeting testing conditions, the exhaust temperature that detects
The result for patching sequence for spending sensor is reliable.
It should be noted that being not typically available can when being unsatisfactory for any one of cold start or testing conditions
The testing result leaned on, therefore, whether electronic control unit does not start patching for detection exhaust gas temperature sensor sequentially correct.
If so, thening follow the steps 30, judging whether the temperature of upstream exhaust temperature sensor is greater than downstream exhaust gas temperature biography
The temperature of sensor.
Specifically, after meeting cold start and testing conditions, electronic control unit starts to judge on gas exhaust piping
The temperature of each exhaust gas temperature sensor.It is understood that starting since upstream exhaust temperature sensor is relatively more close
Machine, upstream exhaust pipeline are firstly received the tail gas of engine emission, and the heating of upstream exhaust temperature sensor can be prior to downstream
Exhaust gas temperature sensor.Also, the temperature of tail gas is higher than the temperature of gas exhaust piping, in tail gas from the upstream of gas exhaust piping toward downstream
During operation, the temperature of tail gas can be gradually decreased, and therefore, the temperature for the tail gas that downstream exhaust gas temperature sensor touches is logical
The temperature for the tail gas that can be often touched to a certain extent lower than upstream exhaust temperature sensor.After engine cold start
In a period of time, the heating rate of upstream exhaust temperature sensor is greater than the heating rate of downstream exhaust gas temperature sensor.Therefore,
Under normal circumstances, it within a period of time after engine cold start, closer to the exhaust gas temperature sensor of engine, rises
Warm rate is faster, and relative temperature is higher.By comparing under cold start and testing conditions upstream exhaust temperature sensor and
The relative temperature of downstream exhaust gas temperature sensor, so that it may judge whether patching for multiple exhaust gas temperature sensors be correct.
If it is not, thening follow the steps 40, output exhaust gas temperature sensor patches abnormal pre-warning signal.
Specifically, if the temperature of the upstream exhaust temperature sensor detected does not have the temperature of downstream exhaust gas temperature sensor
Degree is high, it may be said that bright upstream exhaust temperature sensor and downstream exhaust gas temperature sensor patch mistake, at this point, output early warning letter
Number, it may remind the user that and readjust patching sequentially for each exhaust gas temperature sensor.It should be noted that when on gas exhaust piping
When being provided with two or more exhaust gas temperature sensors, if any two therein or multiple exhaust gas temperature sensors
Mistake is patched, then in all exhaust gas temperature sensors, at least two adjacent exhaust gas temperature sensors will appear, downstream
Exhaust gas temperature sensor be higher than upstream exhaust gas temperature sensor, therefore, pass through detection arbitrary neighborhood two delivery temperatures
Temperature difference between sensor, available whether all exhaust gas temperature sensors patch correctly.
Exhaust gas temperature sensor detection method provided in this embodiment passes through utilization under cold start and testing conditions
Temperature changing regularity and temperature distributing rule between upstream exhaust temperature sensor and downstream exhaust gas temperature sensor, Ke Yizhun
Really detect whether there is a situation where that exhaust gas temperature sensor patches mistake.
Optionally, exhaust gas temperature sensor provided in this embodiment patches abnormal detection method, can be applied to Europe six
The diesel engine of discharge phase.Typically for six diesel engine of Europe, at least two exhaust gas temperature sensors on gas exhaust piping include
Oxidizing catalytic device upstream exhaust temperature sensor, grain catcher upstream exhaust temperature sensor, selective catalytic reduction system
System upstream exhaust temperature sensor and selective catalytic reduction system operating downstream exhaust gas temperature sensor；From the upstream of gas exhaust piping to
The downstream of gas exhaust piping, oxidizing catalytic device upstream exhaust temperature sensor, grain catcher upstream exhaust temperature sensor, choosing
Selecting property catalyst reduction system upstream exhaust temperature sensor and selective catalytic reduction system operating downstream exhaust gas temperature sensor are successively
Arrangement.
Specifically, oxidizing catalytic device upstream exhaust temperature sensor is located at the upstream position of oxidizing catalytic device,
Grain trap upstream exhaust temperature sensor is located at the upstream position of graininess supplementary set device, selective catalytic reduction system operating upstream
Exhaust gas temperature sensor is located at the upstream of selective catalytic reduction system operating, selective catalytic reduction system operating downstream exhaust gas temperature sensing
Device is located at the downstream of selective catalytic reduction system operating.When the case where meeting engine cold start and testing conditions, Ke Yikai
Begin to detect whether correctly aforementioned four exhaust gas temperature sensor patches.If meeting oxidizing catalytic device upstream exhaust temperature sensing
Device, grain catcher upstream exhaust temperature sensor, selective catalytic reduction system operating upstream exhaust temperature sensor and selectivity
The temperature of catalyst reduction system downstream exhaust gas temperature sensor successively reduces, then shows that patching for exhaust gas temperature sensor is correct；
Otherwise, then illustrate at least partly exhaust gas temperature sensor patches that there are mistakes.
It should be noted that the present embodiment and latter embodiments, by taking the diesel engine in six stage of Europe as an example, to exhaust
Temperature sensor patches abnormal detection method and is illustrated, but this is not limitation of the present invention, and the embodiment of the present invention provides
Exhaust gas temperature sensor patch abnormal detection method and be readily applicable on the gas exhaust piping of other kinds of engine
The detection of exhaust gas temperature sensor.
Fig. 3 is the method flow diagram of detection upstream and downstream exhaust gas temperature sensor provided in an embodiment of the present invention.Optionally, it asks
With reference to Fig. 3, judge whether the temperature of upstream exhaust temperature sensor is greater than the temperature of downstream exhaust gas temperature sensor, comprising:
Step 31, the temperature for detecting oxidizing catalytic device upstream exhaust temperature sensor, grain catcher upstream row temperature
Spend temperature, the temperature of selective catalytic reduction system operating upstream exhaust temperature sensor and the selective catalytic reduction system of sensor
The temperature of system downstream exhaust gas temperature sensor.
Specifically, whether correct to detect patching for aforementioned four exhaust gas temperature sensor, meeting cold start and inspection
When survey condition, the temperature of each exhaust gas temperature sensor can be detected first.
Step 32, oxidizing catalytic device upstream exhaust temperature sensor temperature be less than or equal to grain catcher upstream
The temperature of the temperature of exhaust gas temperature sensor, grain catcher upstream exhaust temperature sensor is less than or equal to selective catalysis also
The temperature of original system upstream exhaust temperature sensor, alternatively, in selective catalytic reduction system operating upstream exhaust temperature sensor
When temperature is less than or equal to the temperature of selective catalytic reduction system operating downstream exhaust gas temperature sensor, exhaust gas temperature sensor is exported
Contact abnormal pre-warning signal.
Specifically, it is passed in detection oxidizing catalytic device upstream exhaust temperature sensor, grain catcher upstream exhaust temperature
Sensor, selective catalytic reduction system operating upstream exhaust temperature sensor and selective catalytic reduction system operating downstream exhaust gas temperature sensing
When whether the temperature of device successively reduces, the oxidizing catalytic device upstream exhaust temperature biography relatively close to engine can be detected first
The temperature of sensor and grain catcher upstream exhaust temperature sensor；Then successively compare grain catcher upstream exhaust temperature biography
The temperature and selective catalytic reduction system operating upstream row of sensor and selective catalytic reduction system operating upstream exhaust temperature sensor
The temperature of gas temperature sensor and selective catalytic reduction system operating downstream exhaust gas temperature sensor.Under normal circumstances, in oxidisability
The temperature of catalyst converter upstream exhaust temperature sensor is greater than the temperature of grain catcher upstream exhaust temperature sensor, granule capturing
The temperature of device upstream exhaust temperature sensor is greater than the temperature of selective catalytic reduction system operating upstream exhaust temperature sensor, and
The temperature of selective catalytic reduction system operating upstream exhaust temperature sensor is greater than selective catalytic reduction system operating downstream exhaust gas temperature
When the temperature of sensor, the patching for each exhaust gas temperature sensor on gas exhaust piping is correct.Otherwise, gas exhaust piping up to
Least a portion of exhaust gas temperature sensor patches that there are mistakes, at this point it is possible to export exhaust gas temperature sensor patch it is abnormal pre-
Alert signal, to remind user.
Optionally, the start-up parameter of engine includes environment temperature, coolant temperature and at least two delivery temperatures sensing
The temperature of device.Fig. 4 is the flow chart provided in an embodiment of the present invention for judging engine and whether meeting cold start.Optionally, it asks
With reference to Fig. 4, judge whether engine is cold start according to the start-up parameter of engine, comprising:
Step 11, detection environment temperature, the temperature of coolant temperature and at least two exhaust gas temperature sensors.
Specifically, it is whether accurate judgement engine is cold start, can refers to relevant to engine various
Parameter.Illustratively, the environment temperature of ambient enviroment locating for engine, the coolant liquid in the cooler bin of engine can be referred to
Temperature and gas exhaust piping on each exhaust gas temperature sensor temperature.But judging whether engine is cold start
When, other factors can also be referred to, the present embodiment is not specifically limited this.
Step 12, environment temperature, coolant temperature and at least two exhaust gas temperature sensors temperature be respectively less than or wait
In the first preset value, the absolute value of the difference of any exhaust gas temperature sensor and environment temperature is less than or equal to the second preset value,
The absolute value of the difference of environment temperature and coolant temperature is less than or equal to third preset value and any two delivery temperature passes
When the absolute value of temperature gap between sensor is less than or equal to four preset values, judge engine for cold start.
Specifically, before an engine is started and the moment of engine start, entire to send out if starting to be cold start
The temperature of natural environment locating for the temperature and engine of all parts of motivation is of substantially equal, coolant liquid and delivery temperature sensing
The temperature of device substantially also relatively environment temperature.Therefore, environment temperature, coolant temperature and at least two delivery temperatures pass
The temperature of sensor is respectively less than or is equal to the first preset value, and the absolute value of the temperature gap of any two in three is also usually small
In certain preset value.Therefore, the temperature of environment temperature, coolant temperature and at least two exhaust gas temperature sensors is usually small
In or be equal to the first preset value, the absolute value of the difference of any exhaust gas temperature sensor and environment temperature is typically less than or equal to the
The absolute value of the difference of two preset values, environment temperature and coolant temperature is typically less than or equal to third preset value, and any
When the absolute value of temperature gap between two exhaust gas temperature sensors is typically less than or equal to four preset values, at this point it is possible to
Think that engine is cold start.
Optionally, the first preset value is 45 DEG C, and the second preset value is 5 DEG C, and third preset value is 10 DEG C, and the 4th preset value is
2℃。
Specifically, since engine is usually in outdoor study environment together with vehicle, or it is located in workshop, because
This, before engine cold start and after engine cold start in the very short time, the environment temperature of surrounding, coolant liquid
The temperature of exhaust gas temperature sensor in temperature and gas exhaust piping approaches and starts locating natural environment, and natural environment
Or usually not more than 45 DEG C of the temperature of workshop, therefore, 45 DEG C can be set by the first preset value.Consider sensor
The temperature of the location of detection accuracy and each exhaust gas temperature sensor may have certain difference, each exhaust temperature
May be different between the temperature and actual temperature that degree sensor detects, therefore, 2 can be set by the 4th preset value
℃.Since the temperature of each exhaust gas temperature sensor may not be identical, each exhaust gas temperature sensor and environment temperature
Between difference absolute value may there is also certain differences, therefore, 5 DEG C can be set by the second preset value.Water is most
Common engine coolant, and water may consider summer before an engine is started in shorter time in injection cooler bin
Water temperature may be lower than environment temperature, and in winter, in order to improve the starting efficiency of engine, can be added into cooler bin
Temperature is higher than the coolant liquid of environment temperature, and therefore, the difference of coolant temperature and environment temperature may be bigger.Also, works as and use
When water does coolant liquid, since the specific heat capacity of water is greater than the specific heat of gas exhaust piping and tail gas, the heating of water temperature or rate of temperature fall
Also below gas exhaust piping or tail gas, therefore, third preset value can be set to 10 DEG C.However, it is desirable to explanation, first is pre-
If the selection of value, the second preset value, third preset value and the 4th preset value can be set according to actual needs, the present embodiment
This is not specifically limited.
Optionally, testing conditions include the continuous operating time of engine after cold start, and engine exists after cold start
After revolving speed and cold start in continuous operating time at least two exhaust gas temperature sensors when running continuously between after temperature
Difference.Fig. 5 is the flow chart provided in an embodiment of the present invention for judging engine and whether meeting testing conditions.Optionally, it please refers to
Fig. 5 judges whether engine meets testing conditions according to detection parameters, comprising:
After step 21, detection cold start after the continuous operating time of engine, cold start engine in continuous operation
After revolving speed and cold start in time at least two exhaust gas temperature sensors when running continuously between after temperature gap.
Specifically, engine is after cold start and after running the regular hour, at gas exhaust piping different location
Certain temperature difference can be formed between exhaust gas temperature sensor；Accurately detecting whether each exhaust gas temperature sensor patches just
Before really, can first determine whether engine whether stable operation a period of time.In this regard, can from engine continuous operation when
Long, the temperature gap between the revolving speed and exhaust gas temperature sensor of engine angularly accounts for.It should be noted that this
The testing conditions that embodiment provides include but is not limited to above-mentioned condition.
Step 22, when running continuously between be greater than or equal to preset time；In when running continuously, the revolving speed of engine
Perseverance is greater than or equal to preset rotation speed；And when running continuously between after, the temperature difference between any two exhaust gas temperature sensor
When value is greater than or equal to five preset values, judge that engine meets testing conditions.
Specifically, it after engine is greater than preset rotation speed continuous operation preset time with revolving speed, is discharged from gas exhaust piping
Exhaust gas can be such that the temperature of the exhaust gas temperature sensor in gas exhaust piping at different location increases different, arbitrary neighborhood
Temperature between two exhaust gas temperature sensors generates certain difference.At this point, by detect each exhaust gas temperature sensor it
Between the temperature difference whether be greater than or equal to the 5th preset value, may further determine whether to meet testing conditions.
It should be noted that with oxidizing catalytic device upstream exhaust temperature sensor and grain catcher upstream exhaust temperature
For sensor, in practical applications, before engine cold start, due to accidentalia etc., it is possible that, granule capturing
The actual temperature of device upstream exhaust temperature sensor is slightly above the temperature of oxidizing catalytic device upstream exhaust temperature sensor.It is sending out
After motivation starting, oxidizing catalytic device upstream exhaust temperature sensor can gradually be higher than oxidizing catalytic device upstream exhaust temperature
The temperature of sensor, if the time run after engine start is relatively short, oxidizing catalytic device upstream exhaust temperature sensing
Device is only slightly higher than the temperature of grain catcher upstream exhaust temperature sensor, the absolute value very little of the two difference.But it is limited to
The detection accuracy of exhaust gas temperature sensor, if the temperature that two exhaust gas temperature sensors detect may be deposited with actual temperature
In certain difference, leading to testing result, there are biggish errors, or even detection mistake occur.It therefore, is guarantee testing result
Reliability, in the temperature of oxidizing catalytic device upstream exhaust temperature sensor and grain catcher upstream exhaust temperature sensor
Difference is greater than or equal to after the 5th preset value, judges that engine meets testing conditions, available more accurately and reliably to examine
Survey result.
Optionally, preset time 200s, preset rotation speed 500r/min, the 5th preset value are 3 DEG C.
Specifically, in general, engine is after steady operation, minimum speed (in the idling state) is 500r/min, normally
In the case of, even if engine runs 200s in idling mode, it is also assumed that engine meets the testing conditions succeeded；And
And whether it is greater than 3 DEG C by the absolute value of the temperature gap between detection any two exhaust gas temperature sensor, it can be more into one
Step ground determines that engine meets testing conditions, can start that whether just patching at least two exhaust gas temperature sensors detected
Really.
It should be noted that the 5th preset value can be greater than the 4th preset value.Still with oxidizing catalytic device upstream row temperature
It spends for sensor and particle supplementary set.Before cold start or the moment of cold start, due to accidental sexual factor etc., oxidisability is urged
The temperature for changing device upstream exhaust temperature sensor may be lower by 2.1 than the temperature of grain catcher upstream exhaust temperature sensor
DEG C, due to 2.1 DEG C relatively 2 DEG C, it is limited to the sensitivity of exhaust gas temperature sensor, actually detected obtained oxidizing catalytic
The absolute value of the temperature gap of device upstream exhaust temperature sensor and grain catcher upstream exhaust temperature sensor is likely less than 2
DEG C, thus be likely to be obtained engine and meet cold start condition.And when detecting whether to meet testing conditions, if due to event
The reasons such as barrier, may cause temperature and the grain catcher upstream of oxidizing catalytic device upstream exhaust temperature sensor position
The temperature of exhaust gas temperature sensor position does not change, but since the practical temperature difference of the two is still 2.1 DEG C, in exhaust temperature
It spends in the limited situation of sensor detection accuracy, may will detect that oxidizing catalytic device upstream exhaust temperature sensor and particle
The temperature gap of trap upstream exhaust temperature sensor is greater than 2 DEG C, so that electronic control unit be made to take for engine
Meet testing conditions.In the detection process, due on oxidizing catalytic device upstream exhaust temperature sensor and grain catcher
Temperature gap between trip exhaust gas temperature sensor is not due to after engine start tail gas caused by the gas exhaust piping discharge,
Thus, accurate detection result cannot be obtained.If the 5th preset value is made to be greater than the 4th preset value, even if in case of a fault,
The warm absolute value of the difference that exhaust gas temperature sensor is also impossible to obtain the two is greater than 3 DEG C, it can thus be avoided due to delivery temperature
Mistake is detected caused by the sensitivity of sensor, in actually detected, without specially using expensive highly sensitive exhaust
Detection demand can be completed in temperature sensor, to save production cost.
Optionally, output exhaust gas temperature sensor patch abnormal pre-warning signal, comprising: by light trouble light or
The mode of fault-signal is shown on instrumentation table, exports the pre-warning signal of exhaust gas temperature sensor grafting exception.
Specifically, pre-warning signal is exported using aforesaid way, can observably reminds very much user, promote user as early as possible more
Positive exhaust gas temperature sensor patches sequence.Optionally, when exporting pre-warning signal, can also using voice etc., other are pre-
Police's formula, the present embodiment are not specifically limited this.
Based on the same inventive concept, the present embodiment additionally provides a kind of engine, which includes memory, processor
And be stored on the memory and in the computer program of processor operation, the processor executes the computer journey
Realize that exhaust gas temperature sensor described in above-mentioned any embodiment patches abnormal detection method when sequence.
Engine provided in this embodiment, the exhaust gas temperature sensor detection side provided by using above-mentioned any embodiment
Method, under cold start and testing conditions, by using between upstream exhaust temperature sensor and downstream exhaust gas temperature sensor
Temperature changing regularity and temperature distributing rule, can accurately detect whether to patch the feelings of mistake there are exhaust gas temperature sensor
Condition.
Based on the same inventive concept, the present embodiment additionally provides a kind of vehicle, which includes above-mentioned any embodiment institute
The engine stated.
Vehicle provided in this embodiment, by using the engine that above-mentioned any embodiment provides, in cold start and inspection
It, can by utilizing the temperature changing regularity between upstream exhaust temperature sensor and downstream exhaust gas temperature sensor under the conditions of survey
Accurately to detect whether there is a situation where that exhaust gas temperature sensor patches mistake
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to 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 by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. a kind of temperature sensor patches abnormal detection method, it is installed in the gas exhaust piping of engine at least for detecting
Whether two exhaust gas temperature sensors and at least two exhaust gas temperature sensor connectors patch correctly；At least two exhaust
Temperature sensor includes close to the upstream exhaust temperature sensor of the engine side and far under the engine side
Exhaust gas temperature sensor is swum, under the exhaust gas that the engine generates is from the upstream row of the gas exhaust piping to the gas exhaust piping
Trip；It is characterized in that, the detection method includes:
Judge whether the engine is cold start according to the start-up parameter of the engine；
If so, judging whether the engine meets testing conditions according to detection parameters；
If so, judging whether the temperature of the upstream exhaust temperature sensor is greater than the temperature of the downstream exhaust gas temperature sensor
Degree；
If it is not, output exhaust gas temperature sensor patches abnormal pre-warning signal.
2. detection method according to claim 1, which is characterized in that at least two exhaust gas temperature sensor includes oxygen
The property changed catalyst converter upstream exhaust temperature sensor, grain catcher upstream exhaust temperature sensor, selective catalytic reduction system operating
Upstream exhaust temperature sensor and selective catalytic reduction system operating downstream exhaust gas temperature sensor；From the upstream of the gas exhaust piping
To the downstream of the gas exhaust piping, the oxidizing catalytic device upstream exhaust temperature sensor, the grain catcher upstream row
Gas temperature sensor, the selective catalytic reduction system operating upstream exhaust temperature sensor and the selective catalytic reduction system operating
Downstream exhaust gas temperature sensor is successively arranged.
3. detection method according to claim 2, which is characterized in that the judgement upstream exhaust temperature sensor
Whether temperature is greater than the temperature of the downstream exhaust gas temperature sensor, comprising:
Detect the temperature of the oxidizing catalytic device upstream exhaust temperature sensor, the grain catcher upstream exhaust temperature passes
The temperature of sensor, the temperature of the selective catalytic reduction system operating upstream exhaust temperature sensor and the selective catalysis are also
The temperature of original system downstream exhaust gas temperature sensor；
It is less than or equal to the grain catcher upstream row in the temperature of the oxidizing catalytic device upstream exhaust temperature sensor
The temperature of the temperature of gas temperature sensor, the grain catcher upstream exhaust temperature sensor is less than or equal to the selectivity
The temperature of catalyst reduction system upstream exhaust temperature sensor, alternatively, in the selective catalytic reduction system operating upstream row temperature
When the temperature of degree sensor is less than or equal to the temperature of the selective catalytic reduction system operating downstream exhaust gas temperature sensor, output
The abnormal pre-warning signal of the exhaust gas temperature sensor contact.
4. detection method according to claim 1, which is characterized in that the start-up parameter includes environment temperature, coolant liquid
The temperature of temperature and at least two exhaust gas temperature sensor；
The start-up parameter according to the engine judges whether the engine is cold start, comprising:
Detect the temperature of the environment temperature, the coolant temperature and at least two exhaust gas temperature sensor；
It is respectively less than or waits in the temperature of the environment temperature, the coolant temperature and at least two exhaust gas temperature sensor
In the first preset value, the absolute value of the difference of any exhaust gas temperature sensor and the environment temperature is less than or equal to second
The absolute value of the difference of preset value, the environment temperature and the coolant temperature is less than or equal to third preset value, Yi Jiren
When the absolute value of temperature gap between two exhaust gas temperature sensors of meaning is less than or equal to four preset values, described in judgement
Engine is cold start.
5. detection method according to claim 4, which is characterized in that first preset value is 45 DEG C；
Second preset value is 5 DEG C；
The third preset value is 10 DEG C；
4th preset value is 2 DEG C.
6. detection method according to claim 1, which is characterized in that the testing conditions include the hair after cold start
The continuous operating time of motivation, revolving speed and cold start of the engine in the continuous operating time after cold start
Temperature gap of at least two exhaust gas temperature sensor after the continuous operating time afterwards；
It is described to judge whether the engine meets testing conditions according to detection parameters, comprising:
The engine is detected after cold start after the continuous operating time of the engine, cold start in the continuous operation
Temperature of at least two exhaust gas temperature sensor after the continuous operating time after revolving speed and cold start in time
Difference；
It is greater than or equal to preset time in the continuous operating time；In the continuous operating time, the engine turns
It is fast permanent more than or equal to preset rotation speed；And after the continuous operating time, exhaust gas temperature sensor described in any two it
Between temperature gap be greater than or equal to five preset values when, judge that the engine meets testing conditions.
7. detection method according to claim 6, which is characterized in that the preset time is 200s；
The preset rotation speed is 500r/min；
5th preset value is 3 DEG C.
8. detection method according to claim 1, which is characterized in that the output exhaust gas temperature sensor patches abnormal
Pre-warning signal, comprising:
By way of lighting trouble light or on instrumentation table show fault-signal, output exhaust gas temperature sensor grafting is abnormal
Pre-warning signal.
9. a kind of engine, which is characterized in that including memory, processor and be stored on the memory and in the processing
The computer program of device operation, the processor are realized as described in claim any one of 1-8 when executing the computer program
Exhaust gas temperature sensor patch abnormal detection method.
10. a kind of vehicle, which is characterized in that including engine as claimed in claim 9.
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| CN201811142963.XA CN109139208B (en) | 2018-09-28 | 2018-09-28 | Detection method for abnormal plugging of temperature sensor, engine and vehicle |
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