CN105628257B - A kind of detection method and device of exhaust gas temperature sensor failure - Google Patents

A kind of detection method and device of exhaust gas temperature sensor failure Download PDF

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Publication number
CN105628257B
CN105628257B CN201510963671.2A CN201510963671A CN105628257B CN 105628257 B CN105628257 B CN 105628257B CN 201510963671 A CN201510963671 A CN 201510963671A CN 105628257 B CN105628257 B CN 105628257B
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value
exhaust gas
temperature sensor
gas temperature
period
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CN105628257A (en
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王军
刘旭海
王奉双
王胜
王孝莉
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K15/00—Testing or calibrating of thermometers
    • G01K15/007—Testing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
    • G01K13/024—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow of moving gases
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K2205/00—Application of thermometers in motors, e.g. of a vehicle
    • G01K2205/04—Application of thermometers in motors, e.g. of a vehicle for measuring exhaust gas temperature
    • 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)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The present invention relates to a kind of detection methods of exhaust gas temperature sensor failure and device, this method to include：Establish the correspondence between different engine speed and distributive value and the calibration value of exhaust gas temperature sensor；Further include：For each period in the period of continuous multiple first preset lengths, judge whether the absolute value of the difference between the average value of exhaust gas temperature sensor measured value and the average value of calibration value is more than predetermined threshold value, when the number of the period more than predetermined threshold value is more than predetermined number, judge the exhaust gas temperature sensor failure, technical solution provided by the invention can realize that the measurement error in exhaust gas temperature sensor whole work process detects, compared with prior art, it can judge when upper and lower bound of the exhaust gas temperature sensor measured value without departing from measurement, measured value whether there is deviation.

Description

A kind of detection method and device of exhaust gas temperature sensor failure
Technical field
The present invention relates to the automatic detection fields of automobile, and in particular to a kind of detection method of exhaust gas temperature sensor failure and Device.
Background technology
SCR (Selective Catalytic Reduction, SCR technology) technology is to eliminate diesel engine One of main aftertreatment technologies of nox in exhaust.It is broadly divided into control unit, urea dosage device according to function and urges Change reaction member three parts.The control unit of SCR system and electronic control unit (ECU, the Electronic of engine Control Unit) it integrates, it is mainly used to execute SCR control strategy, and according to environment temperature, delivery temperature, urea The sensor signals such as liquid level, urea temperature, urea pressure, nitrous oxides concentration control urea dosage device, according to demand timing It quantitatively injects urea solution into diesel exhaust gas air-flow；Urea dosage device includes mainly urea box, urea supply list Member, urea injection unit, heating component and connecting line and circuit, abundant atomization and decomposition for ensureing urea liquid；It urges It includes SCR catalyst and its encapsulation to change reaction member mainly, is used for the main harmful components nitrogen oxides in diesel exhaust gas It is reduced to nitrogen and water.
SCR system basic functional principle：Exhaust gas enters after booster turbine outflow in exhaust pipe, while 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, urea solution and high-temp waste gas Hydrolysis and pyrolytic reaction occurs, generates required reducing agent ammonia (NH3), ammonia (NH3) under the effect of the catalyst by nitrogen oxygen Compound is selectively reduced to nitrogen (N2)。
Wherein, delivery temperature temperature sensor is arranged in exhaust pipe, for the temperature signal in exhaust pipe to be converted to electricity The control unit of SCR is sent to after signal, the control unit of SCR is according to exhaust gas temperature sensor and the electricity of other sensors transmission Signal, control urea dosage device spray in a certain amount of urea solution to exhaust pipe, so that urea solution and the exhaust gas in exhaust pipe It reacts.If exhaust gas temperature sensor causes measured value deviation occur due to various reasons, will influence to urinate in exhaust pipe The emitted dose of plain liquid, if the urea solution injection in exhaust pipe is very few, it is possible to exhaust emissions in vehicle operation can be caused It is exceeded, if the urea solution injection in exhaust pipe is excessive, it is possible to urea solution crystallization extra in exhaust pipe can be caused.
Whether just SCR exhaust gas temperature sensors working condition is judged by static detection and dynamic detection in the prior art Often.Static detection thinking is：In engine cold-start, compare exhaust gas temperature sensor and environment temperature sensor measured value, If the two difference is more than predetermined threshold value, judge that exhaust gas temperature sensor is insincere.Dynamic detection thinking is：1) it was running Judge whether exhaust gas temperature sensor measured value is less than the deviation range of theory lower bound value in journey：When the temperature that theoretical model calculates Less than the lower limit Tlo_C that sensor credibility judges, and the duration be more than after preset time the measured value of sensor also do not exist One deviation range (Tlo_C-Tlo of the lower limiting valuemin, Thi_C+Tlomax) in, then judge the detected value failure of sensor.2) Judge in the process of running exhaust gas temperature sensor measured value whether be more than theoretical upper limit value deviation range：When theoretical model meter The temperature of calculation is less than the upper limit Thi_C that sensor credibility judges, and the duration is more than the measurement of sensor after preset time Value is not also in a deviation range (Thi_C-Thi of the upper limit valuemin, Thi_C+Thimax) in, then judge the detection of sensor Value failure.
The defect of the detection method of existing exhaust gas temperature sensor failure is：It can only judge the survey of exhaust gas temperature sensor Whether magnitude is no more than the upper limit measured or the lower limit not less than measurement, and when measured value is no more than the upper limit measured and is not less than When the lower limit of measurement, measured value whether there is deviation, can not be detected.
Invention content
It is an object of the present invention to solve above-mentioned technical problem.
In view of the above-mentioned problems, the present invention proposes a kind of detection method of exhaust gas temperature sensor failure, including：
Establish the correspondence between different engine speed and distributive value and the calibration value of exhaust gas temperature sensor；Also Including：After engine start, for each period in the period of continuous multiple first preset lengths, step is executed Rapid S1- steps S3：
Step S1, according to engine speed and distributive value and the correspondence of time and the different engine speed and Correspondence between distributive value and the calibration value of exhaust gas temperature sensor determines the first average value, and first average value is should The average value of calibration value in period；
Step S2, the second average value is calculated, second average value is that the exhaust gas temperature sensor in the period measures The average value of value；
Step S3, judge whether the absolute value of the difference of the first average value and the second average value is more than predetermined threshold value；
When the number of the period more than predetermined threshold value is more than predetermined number, judge that the exhaust gas temperature sensor loses Effect.
Preferably, the method further includes：
After judging the exhaust gas temperature sensor failure, alarm is sent out.
Preferably, the method further includes：
After judging the exhaust gas temperature sensor failure, corresponding to the engine speed at current time and distributive value The calibration value of exhaust gas temperature sensor is exported as the measured value of current time exhaust gas temperature sensor.
Preferably, the method further includes：
According to the environment temperature and environmental pressure at current time, the calibration value is modified.
Preferably, the step S1 is specifically included：
For reaching each of preset condition sub- period, according to the correspondence of engine speed and distributive value and time And the correspondence between the different engine speed and distributive value and the calibration value of exhaust gas temperature sensor is determined at this The integrated value of calibration value in the sub- period；
By it is identified each integrated value and with the length for each sub- period for meeting preset condition and ratio make For the average value of calibration value in the period；
The step S2 is specifically included：
For reaching each of preset condition sub- period, exhaust gas temperature sensor measured value in the sub- period is calculated Integrated value；
By it is identified each integrated value and with the length for each sub- period for meeting preset condition and ratio make For the average value of calibration value in the period；
Wherein, the preset condition is：Engine speed is not less than preset rotation speed, and engine coolant temperature is not less than pre- If temperature, and in the sub- period measured value of the exhaust gas temperature sensor amplitude of variation in pre-set interval.
A kind of detection device of exhaust gas temperature sensor failure, including：
Unit is established, is passed with delivery temperature for after engine start, establishing different engine speed and distributive value Correspondence between the calibration value of sensor；
Determination unit is used for after engine start, for every in the period of continuous multiple first preset lengths One period, according to engine speed and distributive value and the correspondence of time and the different engine speed and oil spout Correspondence between amount and the calibration value of exhaust gas temperature sensor determines that the first average value, first average value are at this Between calibration value in section average value；
Computing unit is used for after engine start, for every in the period of continuous multiple first preset lengths One period, the second average value is calculated, second average value is the exhaust gas temperature sensor measured value in the period Average value；
Comparing unit is used for after engine start, for every in the period of continuous multiple first preset lengths One period, judge whether the absolute value of the difference of the first average value and the second average value is more than predetermined threshold value；
Judging unit, for after engine start, being more than predetermined number in the number of the period more than predetermined threshold value When, judge the exhaust gas temperature sensor failure.
Preferably, described device further includes：
Alarm unit, for after judging the exhaust gas temperature sensor failure, sending out alarm.
Preferably, described device further includes：
Output unit, for after judging exhaust gas temperature sensor failure, by the engine speed at current time with The calibration value of exhaust gas temperature sensor corresponding to distributive value is exported as the measured value of current time exhaust gas temperature sensor.
Preferably, described device further includes：
Amending unit is modified the calibration value for the environment temperature and environmental pressure according to current time.
Preferably, the determination unit specifically includes：
First integral subelement, for for reaching each of preset condition sub- period, according to engine speed and spray Oil mass and the correspondence of time and the calibration value of the different engine speed and distributive value and exhaust gas temperature sensor it Between correspondence determine within the sub- period calibration value integrated value；
First mean value calculation subelement, for by identified each integrated value and with each son for meeting preset condition Average value of the ratio of the sum of the length of period as calibration value in the period；
The computing unit specifically includes：
Second integral subelement, for for reaching each of preset condition sub- period, calculating row in the sub- period The integrated value of temperature degree measurement value sensor；
Second mean value calculation subelement, for by identified each integrated value and with each son for meeting preset condition Average value of the ratio of the sum of the length of period as calibration value in the period；
Wherein, the preset condition is：Engine speed is not less than preset rotation speed, and engine coolant temperature is not less than pre- If temperature, and in the sub- period measured value of the exhaust gas temperature sensor amplitude of variation in pre-set interval.
A kind of detection method of exhaust gas temperature sensor failure provided by the invention, judges the continuous multiple first default length The average value of exhaust gas temperature sensor measured value in each period in the period of degree and between the average value of calibration value Difference absolute value whether be more than predetermined threshold value, when the number of the period more than predetermined threshold value be more than predetermined number when, sentence The fixed exhaust gas temperature sensor failure, technical solution provided by the invention can realize exhaust gas temperature sensor whole work process In measurement error detection, compared with prior art, can judge when exhaust gas temperature sensor measured value without departing from measurement When upper and lower bound, measured value whether there is deviation.
Description of the drawings
Fig. 1 is a kind of detection method flow diagram for exhaust gas temperature sensor failure that one embodiment of the invention provides；
Fig. 2 is a kind of detection method flow signal for exhaust gas temperature sensor failure that another embodiment of the present invention provides Figure；
Fig. 3 is a kind of detection device schematic block diagram for exhaust gas temperature sensor failure that another embodiment of the present invention provides.
Specific implementation mode
To better understand the objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and specific real Mode is applied the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application Feature in example and embodiment can be combined with each other.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also To be implemented different from other modes described here using other, therefore, protection scope of the present invention is not by described below Specific embodiment limitation.
Fig. 1 is a kind of detection method flow diagram for exhaust gas temperature sensor failure that one embodiment of the invention provides. Referring to Fig. 1, this method includes：
Step S0, it establishes corresponding between different engine speed and distributive value and the calibration value of exhaust gas temperature sensor Relationship；Further include：After engine start, for each time in the period of continuous multiple first preset lengths Section executes step S1- steps S3：
Step S1, according to engine speed and distributive value and the correspondence of time and the different engine speed and Correspondence between distributive value and the calibration value of exhaust gas temperature sensor determines the first average value, and first average value is should The average value of calibration value in period；
Step S2, the second average value is calculated, second average value is that the exhaust gas temperature sensor in the period measures The average value of value；
Step S3, judge whether the absolute value of the difference of the first average value and the second average value is more than predetermined threshold value；
Step S4, when the number of the period more than predetermined threshold value is more than predetermined number, judge that the delivery temperature passes Sensor fails.
It should be noted that above-mentioned steps S1~S4 is in a driving cycle (from engine start to adjacent primary Engine stop) in carry out, when enter next driving cycle, i.e., when engine is again started up, re-execute above-mentioned steps S1~S4, until engine is out of service again.
As shown from the above technical solution, the detection method of a kind of exhaust gas temperature sensor failure provided by the invention, judges The average value of the exhaust gas temperature sensor measured value in each period in the period of continuous multiple first preset lengths Whether the absolute value of the difference between the average value of calibration value is more than predetermined threshold value, as of the period more than predetermined threshold value When number is more than predetermined number, judge that the exhaust gas temperature sensor failure, technical solution provided by the invention can realize exhaust temperature The measurement error detection in sensor whole work process is spent, compared with prior art, can judge to work as exhaust gas temperature sensor Measured value without departing from measurement upper and lower bound when, measured value whether there is deviation.
In order to make it easy to understand, being exemplified below the specific implementation mode of above-mentioned steps S0~S4 (it should be noted that following Citing is a kind of embodiment of above-mentioned technical proposal, is not the restriction to above-mentioned technical proposal embodiment)：
Such as：The period of first preset length is 10 minutes, predetermined threshold value 5, and predetermined number is 3, current time It is 7:10, the specific implementation mode of said program is：First pass through bench test establish different engine speed and distributive value with Correspondence between the calibration value of exhaust gas temperature sensor, storage in memory, then follow the steps below：
1) according to 7:00-7:10 intrinsic motivation rotating speeds and distributive value and the correspondence of time and pre-stored difference Engine speed and distributive value and exhaust gas temperature sensor calibration value between correspondence, establish exhaust gas temperature sensor mark Function of the definite value about the time, and this functional value is calculated 7:00-7:Average value in 10 is 30；
2) 7 are established:00-7:Function of the exhaust gas temperature sensor actual value about the time in 10, and calculate this function and exist 7:00-7:Average value in 10 is 20；
3) due to | 30-20 | ＞ 5 is counted primary.
7:To the period 7 when 20:10-7:20 execute and above-mentioned steps 1 again)~3) similar operations, then wait until 7:When 30 To the period 7:20-7:30 execute and above-mentioned steps 1 again)~3) similar operations ... are when cumulative number reaches 3 times, judgement row Gas temperature sensor fails.
In the specific implementation, the mark of different engine speed and distributive value and exhaust gas temperature sensor is established in step S0 Correspondence between definite value can be established according to historical experience value, can also be established according to test result.
Such as：Different engine speed and distributive value and exhaust gas temperature sensor are established by rack or complete vehicle test Correspondence between calibration value：Using engine speed as abscissa, distributive value is transverse and longitudinal coordinate, passes through bench test or vehicle Delivery temperature corresponding to Experimental Calibration different engine and distributive value.
When it is implemented, when being demarcated by bench test, it is contemplated that in certain engine speed and distributive value Under, connect the upstream exhaust pipe of SCR (Selective Catalytic Reduction, SCR technology) device Lu Yuechang, exhaust temperature drop can be bigger, and in order to ensure the accuracy of nominal data, when rack is arranged, upstream exhaust pipeline length is as possible Close to vehicle virtual condition.
It is understandable to be, according to engine speed and distributive value and the correspondence of time and the difference in step S1 Engine speed and distributive value and the calibration value of exhaust gas temperature sensor between correspondence determine in the period internal standard The average value of definite value needs first to be turned from the correspondence of time and the different engine according to engine speed and distributive value Speed and the correspondence between distributive value and the calibration value of exhaust gas temperature sensor establish exhaust gas temperature sensor calibration value and The correspondence of time establishes function of the calibration value about the time of exhaust gas temperature sensor, then ask this functional value Average value in the period of one preset length.
The average value that exhaust gas temperature sensor measured value in the period is calculated in step S2 is to establish delivery temperature sensing Then function of the measured value of device about the time seeks average value of this functional value within the period of the first preset length.
Judge whether the absolute value of the difference of two average value is more than predetermined threshold value in step S3, the predetermined threshold value can be with It is configured according to the temperature of the type of exhaust gas temperature sensor, sensitivity and external environment, pressure.
In step S4 when the number of the period more than predetermined threshold value is more than predetermined number, judge that the delivery temperature passes Sensor fails, and the predetermined threshold value and predetermined number can be configured according to actual needs.
As shown in Figure 2, it is preferable that the method further includes：
Step S5, after judging the exhaust gas temperature sensor failure, alarm is sent out.
It is understood that after exhaust gas temperature sensor fails, sending out alarm can remind driver to carry out event in time Barrier check, to avoid occur exhaust gas temperature sensor failure after influence exhaust pipe in urea solution emitted dose, so as to cause vehicle Exhaust emissions is exceeded in operational process, or caused by the urea solution injection in exhaust pipe is excessive it is extra in exhaust pipe Urea solution crystallizes.
Preferably, the method further includes：
Step S6, after judging the exhaust gas temperature sensor failure, by the engine speed and distributive value at current time The calibration value of corresponding exhaust gas temperature sensor is exported as the measured value of current time exhaust gas temperature sensor.
It is understood that after judging the exhaust gas temperature sensor failure, the engine speed at current time is obtained It can be with as the measured value of current time exhaust gas temperature sensor with the calibration value of the exhaust gas temperature sensor corresponding to distributive value After ensureing exhaust gas temperature sensor failure, SCR system can also run well.
Preferably, the method further includes：
Step S7, according to the environment temperature at current time and environmental pressure, the calibration value is modified.
It is understood that even if engine speed is identical with distributive value, under different environment temperatures and environmental pressure, The measured value of exhaust gas temperature sensor can also change, therefore according to the environment temperature and environmental pressure at current time, to described Calibration value is modified, it is ensured that the work feelings of exhaust gas temperature sensor when calibration value more can truly reflect vehicle operation Condition, the revised calibration value of later use go whether detection measured value has deviation, can improve the standard for judging whether sensor fails Exactness.
Preferably, the step S1 is specifically included：
Step S11, for reaching each of preset condition sub- period, according to engine speed and distributive value and time Correspondence between correspondence and the different engine speed and distributive value and the calibration value of exhaust gas temperature sensor Determine the integrated value of the calibration value within the sub- period；
Step S12, by identified each integrated value and with the length for each sub- period for meeting preset condition and Average value of the ratio as calibration value in the period；
The step S2 is specifically included：
Step S21, for reaching each of preset condition sub- period, exhaust gas temperature sensor in the sub- period is calculated The integrated value of measured value；
Step S22, by identified each integrated value and with the length for each sub- period for meeting preset condition and Average value of the ratio as calibration value in the period；
Wherein, the preset condition is：Engine speed is not less than preset rotation speed, and engine coolant temperature is not less than pre- If temperature, and in the sub- period measured value of the exhaust gas temperature sensor amplitude of variation in pre-set interval.
Optionally, the preset rotation speed, preset temperature, pre-set interval can be real according to engine type, environment temperature etc. Border situation is set.
It is understood that engine speed is not less than preset rotation speed, and engine coolant temperature is not less than preset temperature, And the amplitude of variation of the measured value of the exhaust gas temperature sensor can ensure engine in pre-set interval in the sub- period Through start steady operation, at this time in exhaust pipe delivery temperature in a stable variation range, it is possible to reduce delivery temperature pass The measured value of sensor is due to external disturbance acute variation and the misinterpretation of sensor failure that brings in a short time.
It is understood that the period of the first preset length is divided into several sub- periods, to meeting preset condition The sub- period, quadrature respectively to calibration value and measured value, and for being unsatisfactory for the sub- period of preset condition, not to calibration Value and measured value are quadratured, and can make final difference between the average value of calculated calibration value and the average value of measured value more It can really reflect measured deviation of the exhaust gas temperature sensor in real work situation, it is possible to reduce due to some external disturbance bands The erroneous judgement of the exhaust gas temperature sensor failure come.
As shown in figure 3, the invention also provides a kind of detection devices 100 of exhaust gas temperature sensor failure, including：
Unit 101 is established, for after engine start, establishing different engine speed and distributive value and delivery temperature Correspondence between the calibration value of sensor；
Determination unit 102 is used for after engine start, in the period of continuous multiple first preset lengths Each period, according to engine speed and distributive value and the correspondence of time and the different engine speed and spray Correspondence between oil mass and the calibration value of exhaust gas temperature sensor determines that the first average value, first average value are at this The average value of calibration value in period；
Computing unit 103 is used for after engine start, in the period of continuous multiple first preset lengths Each period, the second average value is calculated, second average value is the exhaust gas temperature sensor measured value in the period Average value；
Comparing unit 104 is used for after engine start, in the period of continuous multiple first preset lengths Each period, judge whether the absolute value of the difference of the first average value and the second average value is more than predetermined threshold value；
Judging unit 105, for after engine start, being more than default in the number of the period more than predetermined threshold value When number, the exhaust gas temperature sensor failure is judged.
Preferably, shown device further includes：
Alarm unit, for after judging the exhaust gas temperature sensor failure, sending out alarm.
Preferably, shown device further includes：
Output unit, for after judging exhaust gas temperature sensor failure, by the engine speed at current time with The calibration value of exhaust gas temperature sensor corresponding to distributive value is exported as the measured value of current time exhaust gas temperature sensor.
Preferably, described device further includes：
Amending unit is modified the calibration value for the environment temperature and environmental pressure according to current time.
Preferably, the determination unit specifically includes：
First integral subelement, for for reaching each of preset condition sub- period, according to engine speed and spray Oil mass and the correspondence of time and the calibration value of the different engine speed and distributive value and exhaust gas temperature sensor it Between correspondence determine within the sub- period calibration value integrated value；
First mean value calculation subelement, for by identified each integrated value and with each son for meeting preset condition Average value of the ratio of the sum of the length of period as calibration value in the period；
The computing unit specifically includes：
Second integral subelement, for for reaching each of preset condition sub- period, calculating row in the sub- period The integrated value of temperature degree measurement value sensor；
Second mean value calculation subelement, for by identified each integrated value and with each son for meeting preset condition Average value of the ratio of the sum of the length of period as calibration value in the period；
Wherein, the preset condition is：Engine speed is not less than preset rotation speed, and engine coolant temperature is not less than pre- If temperature, and in the sub- period measured value of the exhaust gas temperature sensor amplitude of variation in pre-set interval.
To sum up, the detection method of a kind of exhaust gas temperature sensor failure provided by the invention, judges continuous multiple first The average value of exhaust gas temperature sensor measured value in each period in the period of preset length and being averaged for calibration value Whether the absolute value of the difference between value is more than predetermined threshold value, when the number of the period more than predetermined threshold value is more than predetermined number When, judge that the exhaust gas temperature sensor failure, technical solution provided by the invention can realize the entire work of exhaust gas temperature sensor During work measurement error detection, compared with prior art, can judge when exhaust gas temperature sensor measured value without departing from When the upper and lower bound of measurement, measured value whether there is deviation.
In the present invention, term " first ", " second " are used for description purposes only, and are not understood to indicate or imply opposite Importance.Term " multiple " refers to two or more, unless otherwise restricted clearly.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims (8)

1. a kind of detection method of exhaust gas temperature sensor failure, which is characterized in that including：
Establish the correspondence between different engine speed and distributive value and the calibration value of exhaust gas temperature sensor；Also wrap It includes：After engine start, for each period in the period of continuous multiple first preset lengths, step is executed S1- steps S3：
Step S1, according to engine speed and distributive value and the correspondence of time and the different engine speed and oil spout Correspondence between amount and the calibration value of exhaust gas temperature sensor determines that the first average value, first average value are the time The average value of calibration value in section；
Step S2, the second average value is calculated, second average value is the exhaust gas temperature sensor measured value in the period Average value；
Step S3, judge whether the absolute value of the difference of the first average value and the second average value is more than predetermined threshold value；
When the number of the period more than predetermined threshold value is more than predetermined number, the exhaust gas temperature sensor failure is judged；
The step S1 is specifically included：
For reaching each of preset condition sub- period, according to engine speed and distributive value and the correspondence of time and institute The correspondence stated between different engine speed and distributive value and the calibration value of exhaust gas temperature sensor is determined in the period of the day from 11 p.m. to 1 a.m Between in section calibration value integrated value；
Using it is identified each integrated value and with the length for each sub- period for meeting preset condition and ratio as should The average value of calibration value in period；
The step S2 is specifically included：
For reaching each of preset condition sub- period, the integral of exhaust gas temperature sensor measured value in the sub- period is calculated Value；
Using it is identified each integrated value and with the length for each sub- period for meeting preset condition and ratio as should The average value of calibration value in period；
Wherein, the preset condition is：Engine speed is not less than preset rotation speed, and engine coolant temperature is not less than default temperature Degree, and in the sub- period measured value of the exhaust gas temperature sensor amplitude of variation in pre-set interval.
2. the detection method of exhaust gas temperature sensor failure according to claim 1, which is characterized in that further include：
After judging the exhaust gas temperature sensor failure, alarm is sent out.
3. the detection method of exhaust gas temperature sensor failure according to claim 1, which is characterized in that further include：
After judging the exhaust gas temperature sensor failure, by the exhaust corresponding to the engine speed at current time and distributive value The calibration value of temperature sensor is exported as the measured value of current time exhaust gas temperature sensor.
4. the detection method of exhaust gas temperature sensor failure according to claim 1, which is characterized in that further include：
According to the environment temperature and environmental pressure at current time, the calibration value is modified.
5. a kind of detection device of exhaust gas temperature sensor failure, which is characterized in that including：
Unit is established, for establishing pair between different engine speed and distributive value and the calibration value of exhaust gas temperature sensor It should be related to；
Determination unit is used for after engine start, for each in the period of continuous multiple first preset lengths Period, according to engine speed and distributive value and the correspondence of time and the different engine speed and distributive value with Correspondence between the calibration value of exhaust gas temperature sensor determines that the first average value, first average value are in the period The average value of interior calibration value；
Computing unit is used for after engine start, for each in the period of continuous multiple first preset lengths Period, the second average value is calculated, second average value is being averaged for the exhaust gas temperature sensor measured value in the period Value；
Comparing unit is used for after engine start, for each in the period of continuous multiple first preset lengths Period, judge whether the absolute value of the difference of the first average value and the second average value is more than predetermined threshold value；
Judging unit, for after engine start, when the number of the period more than predetermined threshold value is more than predetermined number, sentencing The fixed exhaust gas temperature sensor failure；
Wherein, the determination unit specifically includes：
First integral subelement, for for reaching each of preset condition sub- period, according to engine speed and distributive value Between the correspondence of time and the different engine speed and distributive value and the calibration value of exhaust gas temperature sensor Correspondence determines the integrated value of the calibration value within the sub- period；
First mean value calculation subelement, for by identified each integrated value and with each sub- time for meeting preset condition Average value of the ratio of the sum of the length of section as calibration value in the period；
The computing unit specifically includes：
Second integral subelement, for for reaching each of preset condition sub- period, calculating exhaust temperature in the sub- period Spend the integrated value of measurement value sensor；
Second mean value calculation subelement, for by identified each integrated value and with each sub- time for meeting preset condition Average value of the ratio of the sum of the length of section as calibration value in the period；
Wherein, the preset condition is：Engine speed is not less than preset rotation speed, and engine coolant temperature is not less than default temperature Degree, and in the sub- period measured value of the exhaust gas temperature sensor amplitude of variation in pre-set interval.
6. the detection device of exhaust gas temperature sensor failure according to claim 5, which is characterized in that further include：
Alarm unit, for after judging the exhaust gas temperature sensor failure, sending out alarm.
7. the detection device of exhaust gas temperature sensor failure according to claim 5, which is characterized in that further include：
Output unit is used for after judging the exhaust gas temperature sensor failure, by the engine speed at current time and oil spout The calibration value of the corresponding exhaust gas temperature sensor of amount is exported as the measured value of current time exhaust gas temperature sensor.
8. the detection device of exhaust gas temperature sensor failure according to claim 5, which is characterized in that further include：
Amending unit is modified the calibration value for the environment temperature and environmental pressure according to current time.
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