CN105628257A - Method and device for detecting failure of exhaust temperature sensor - Google Patents

Method and device for detecting failure of exhaust temperature sensor Download PDF

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Publication number
CN105628257A
CN105628257A CN201510963671.2A CN201510963671A CN105628257A CN 105628257 A CN105628257 A CN 105628257A CN 201510963671 A CN201510963671 A CN 201510963671A CN 105628257 A CN105628257 A CN 105628257A
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China
Prior art keywords
temperature sensor
exhaust gas
value
gas temperature
time period
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CN201510963671.2A
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CN105628257B (en
Inventor
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 invention relates to a method and a device for detecting failure of an exhaust temperature sensor. The method comprises steps: a corresponding relation between different engine rotation speeds and fuel injection quantities and calibration values of the exhaust temperature sensor is built; as for each time period in continuous multiple time periods with first preset lengths, whether the absolute value of the difference between the average value of exhaust temperature sensor measurement values and the average value of the calibration values is larger than a preset threshold is judged, and when the number of time periods during which the absolute value is larger than the preset threshold is larger than a preset number, the exhaust temperature sensor is judged to fail. According to the technical scheme provided by the invention, error detection on the measurement values of the exhaust temperature sensor during the overall working process can be realized; and compared with the prior art, whether the measurement values have deviation when the measurement values of the exhaust temperature sensor do not exceed the upper limit and the lower limit of measurement can be judged.

Description

The detection method of a kind of exhaust gas temperature sensor inefficacy and device
Technical field
The present invention relates to the automatic detection field of automobile, be specifically related to detection method and device that a kind of exhaust gas temperature sensor lost efficacy.
Background technology
SCR (SelectiveCatalyticReduction, SCR technology) technology is to eliminate one of main aftertreatment technologies of nitrogen oxides in diesel exhaust gas. It is broadly divided into control unit, carbamide dosage device and catalytic reaction unit three part according to function. Electronic control unit (the ECU of the control unit of SCR system and electromotor, ElectronicControlUnit) integrate, it is mainly used to perform SCR control strategy, and control carbamide dosage device according to sensor signals such as ambient temperature, delivery temperature, urea level, urea temperature, carbamide pressure, nitrous oxides concentrations, inject urea solution into according to demand in diesel exhaust gas air-flow at regular time and quantity; Carbamide dosage device mainly includes urea box, urea supply unit, carbamide injection unit, heating assembly and connecting line and circuit, for ensureing the fully atomization of urea liquid and decomposing; Catalytic reaction unit mainly includes SCR catalyst and encapsulation thereof, and being used for the main harmful components reduction of nitrogen oxide in diesel exhaust gas is nitrogen and water.
SCR system basic functional principle: waste gas enters exhaustor after flowing out from booster turbine, by the carbamide injection unit being arranged on exhaustor, quantitative aqueous solution of urea is sprayed in exhaustor with vaporific form simultaneously, there is hydrolysis and pyrolytic reaction in urea solution and high-temp waste gas, generates required reducing agent ammonia (NH3), ammonia (NH3) under the effect of catalyst, nitrogen oxides is reduced to selectively nitrogen (N2)��
Wherein, delivery temperature temperature sensor is arranged in exhaustor, for being sent to the control unit of SCR after the temperature signal in exhaustor is converted to the signal of telecommunication, the signal of telecommunication that the control unit of SCR sends according to exhaust gas temperature sensor and other sensors, control carbamide dosage device and spray a certain amount of urea solution in exhaustor, so that urea solution reacts with the waste gas in exhaustor. If due to a variety of causes, exhaust gas temperature sensor causes that deviation occurs in measured value, the emitted dose of urea solution in exhaustor will be affected, if the urea solution injection in exhaustor is very few, it is possible to can cause that in vehicle operation, exhaust emissions exceeds standard, if the urea solution injection in exhaustor is too much, it is possible to can cause urea solution crystallization unnecessary in exhaustor.
By Static Detection and dynamic detection, prior art judges that whether SCR exhaust gas temperature sensor duty is normal. Static Detection thinking is: when engine cold-start, compares exhaust gas temperature sensor and environment temperature sensor measured value, if both differences are more than predetermined threshold value, then judges that exhaust gas temperature sensor is insincere. Dynamically detection thinking is: 1) judge in running that exhaust gas temperature sensor measured value is whether lower than the deviation range of theory lower bound value: the lower limit Tlo_C judged lower than sensor credibility when the temperature of theoretical model calculating, and the persistent period exceedes after Preset Time the measured value of sensor also not at a deviation range (Tlo_C-Tlo of this lower limitmin, Thi_C+Tlomax) in, then judge that the detected value of sensor lost efficacy. 2) in running, judge whether exhaust gas temperature sensor measured value exceedes the deviation range of limit value in theory: the upper limit Thi_C that judges lower than sensor credibility of temperature calculated when theoretical model, and the persistent period exceedes after Preset Time the measured value of sensor also not at a deviation range (Thi_C-Thi of this higher limitmin, Thi_C+Thimax) in, then judge that the detected value of sensor lost efficacy.
The detection method that existing exhaust gas temperature sensor lost efficacy has the drawback that: can only judge that whether the measured value of exhaust gas temperature sensor is less than the upper limit measured or the lower limit being not less than measurement, and when measured value is less than the upper limit measured and when being not less than the lower limit of measurement, whether measured value exists deviation, and detection is not out.
Summary of the invention
It is an object of the present invention to solve above-mentioned technical problem.
For the problems referred to above, the present invention proposes the detection method that a kind of exhaust gas temperature sensor lost efficacy, including:
Set up the corresponding relation between different engine speed and distributive value and the calibration value of exhaust gas temperature sensor; Also include: when after engine start, for each time period in the time period of multiple first preset length of continuous print, perform step S1-step S3:
Step S1, determine that the first meansigma methods, described first meansigma methods are the meansigma methods of the calibration value in this time period according to the corresponding relation between engine speed and distributive value from the corresponding relation of time and described different engine speed and distributive value and the calibration value of exhaust gas temperature sensor;
Step S2, calculating the second meansigma methods, described second meansigma methods is the meansigma methods of the exhaust gas temperature sensor measured value in this time period;
Step S3, judge that whether the absolute value of difference of the first meansigma methods and the second meansigma methods is more than predetermined threshold value;
When the number of the time period more than predetermined threshold value is more than predetermined number, it is determined that described exhaust gas temperature sensor lost efficacy.
Preferably, described method also includes:
After judging that described exhaust gas temperature sensor lost efficacy, send alarm.
Preferably, described method also includes:
After judging that described exhaust gas temperature sensor lost efficacy, the calibration value of the exhaust gas temperature sensor corresponding to the engine speed of current time and distributive value is exported as the measured value of current time exhaust gas temperature sensor.
Preferably, described method also includes:
Ambient temperature according to current time and ambient pressure, be modified described calibration value.
Preferably, described step S1 specifically includes:
For reaching the pre-conditioned each sub-time period, determine the integrated value of calibration value within this sub-time period according to the corresponding relation between engine speed and distributive value from the corresponding relation of time and described different engine speed and distributive value and the calibration value of exhaust gas temperature sensor;
Using each integrated value determined and with meet the pre-conditioned each sub-time period length and ratio as the meansigma methods of calibration value in this time period;
Described step S2 specifically includes:
For reaching the pre-conditioned each sub-time period, calculate the integrated value of exhaust gas temperature sensor measured value in this sub-time period;
Using each integrated value determined and with meet the pre-conditioned each sub-time period length and ratio as the meansigma methods of calibration value in this time period;
Wherein, described pre-conditioned be: engine speed is not less than preset rotation speed, and engine coolant temperature be not less than preset temperature, and in the sub-time period amplitude of variation of the measured value of described exhaust gas temperature sensor in pre-set interval.
The detecting device that a kind of exhaust gas temperature sensor lost efficacy, including:
Set up unit, for when, after engine start, setting up the corresponding relation between different engine speed and distributive value and the calibration value of exhaust gas temperature sensor;
Determine unit, for when after engine start, for each time period in the time period of multiple first preset length of continuous print, determine that the first meansigma methods, described first meansigma methods are the meansigma methods of the calibration value within this time period according to the corresponding relation between engine speed and distributive value from the corresponding relation of time and described different engine speed and distributive value and the calibration value of exhaust gas temperature sensor;
Computing unit, for when after engine start, for each time period in the time period of multiple first preset length of continuous print, calculating the second meansigma methods, described second meansigma methods is the meansigma methods of the exhaust gas temperature sensor measured value in this time period;
Comparing unit, for when after engine start, for each time period in the time period of multiple first preset length of continuous print, it is judged that whether the absolute value of the difference of the first meansigma methods and the second meansigma methods is more than predetermined threshold value;
Judging unit, for when after engine start, when the number of the time period more than predetermined threshold value is more than predetermined number, it is determined that described exhaust gas temperature sensor lost efficacy.
Preferably, described device also includes:
Alarm unit, for, after judging that described exhaust gas temperature sensor lost efficacy, sending alarm.
Preferably, described device also includes:
Output unit, for, after judging that described exhaust gas temperature sensor lost efficacy, exporting the calibration value of the exhaust gas temperature sensor corresponding to the engine speed of current time and distributive value as the measured value of current time exhaust gas temperature sensor.
Preferably, described device also includes:
Amending unit, for the ambient temperature according to current time and ambient pressure, is modified described calibration value.
Preferably, described determine that unit specifically includes:
First integral subelement, for for reaching the pre-conditioned each sub-time period, determining the integrated value of calibration value within this sub-time period according to the corresponding relation between engine speed and distributive value from the corresponding relation of time and described different engine speed and distributive value and the calibration value of exhaust gas temperature sensor;
First mean value calculation subelement, for using each integrated value determined and with meet the pre-conditioned each sub-time period length and ratio as the meansigma methods of calibration value in this time period;
Described computing unit specifically includes:
Second integral subelement, for for reaching the pre-conditioned each sub-time period, calculating the integrated value of exhaust gas temperature sensor measured value in this sub-time period;
Second mean value calculation subelement, for using each integrated value determined and with meet the pre-conditioned each sub-time period length and ratio as the meansigma methods of calibration value in this time period;
Wherein, described pre-conditioned be: engine speed is not less than preset rotation speed, and engine coolant temperature be not less than preset temperature, and in the sub-time period amplitude of variation of the measured value of described exhaust gas temperature sensor in pre-set interval.
The detection method that a kind of exhaust gas temperature sensor provided by the invention lost efficacy, judge that whether the absolute value of difference between meansigma methods and the meansigma methods of calibration value of the exhaust gas temperature sensor measured value in each time period in the time period of multiple first preset length of continuous print is more than predetermined threshold value, when the number of the time period more than predetermined threshold value is more than predetermined number, judge that described exhaust gas temperature sensor lost efficacy, technical scheme provided by the invention can realize the measurement error detection in the whole work process of exhaust gas temperature sensor, compared to existing technology, can judge when exhaust gas temperature sensor measured value is without departing from the upper and lower bound measured, whether measured value exists deviation.
Accompanying drawing explanation
The detection method schematic flow sheet that a kind of exhaust gas temperature sensor that Fig. 1 provides for one embodiment of the invention lost efficacy;
The detection method schematic flow sheet that a kind of exhaust gas temperature sensor that Fig. 2 provides for another embodiment of the present invention lost efficacy;
The detecting device schematic block diagram that a kind of exhaust gas temperature sensor that Fig. 3 provides for another embodiment of the present invention lost efficacy.
Detailed description of the invention
In order to be more clearly understood that the above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail. It should be noted that when not conflicting, embodiments herein and the feature in embodiment can be mutually combined.
Elaborate a lot of detail in the following description so that fully understanding the present invention; but; the present invention can also adopt other to be different from other modes described here to implement, and therefore, protection scope of the present invention is by the restriction of following public specific embodiment.
The detection method schematic flow sheet that a kind of exhaust gas temperature sensor that Fig. 1 provides for one embodiment of the invention lost efficacy. Referring to Fig. 1, the method includes:
Step S0, the corresponding relation set up between different engine speed and distributive value and the calibration value of exhaust gas temperature sensor; Also include: when after engine start, for each time period in the time period of multiple first preset length of continuous print, perform step S1-step S3:
Step S1, determine that the first meansigma methods, described first meansigma methods are the meansigma methods of the calibration value in this time period according to the corresponding relation between engine speed and distributive value from the corresponding relation of time and described different engine speed and distributive value and the calibration value of exhaust gas temperature sensor;
Step S2, calculating the second meansigma methods, described second meansigma methods is the meansigma methods of the exhaust gas temperature sensor measured value in this time period;
Step S3, judge that whether the absolute value of difference of the first meansigma methods and the second meansigma methods is more than predetermined threshold value;
Step S4, when the number of the time period more than predetermined threshold value is more than predetermined number, it is determined that described exhaust gas temperature sensor lost efficacy.
It should be noted that, above-mentioned steps S1��S4 carries out in a driving cycle (from engine start to an engine stop of next-door neighbour), when entering next driving cycle, namely when electromotor is again started up, re-execute above-mentioned steps S1��S4, until electromotor is again out of service.
As shown from the above technical solution, the detection method that a kind of exhaust gas temperature sensor provided by the invention lost efficacy, judge that whether the absolute value of difference between meansigma methods and the meansigma methods of calibration value of the exhaust gas temperature sensor measured value in each time period in the time period of multiple first preset length of continuous print is more than predetermined threshold value, when the number of the time period more than predetermined threshold value is more than predetermined number, judge that described exhaust gas temperature sensor lost efficacy, technical scheme provided by the invention can realize the measurement error detection in the whole work process of exhaust gas temperature sensor, compared to existing technology, can judge when exhaust gas temperature sensor measured value is without departing from the upper and lower bound measured, whether measured value exists deviation.
In order to make it easy to understand, the detailed description of the invention to above-mentioned steps S0��S4 is exemplified below (it should be noted that following citing is a kind of embodiment of technique scheme, be not the restriction to technique scheme embodiment):
Such as: the time period of the first preset length is 10 minutes, predetermined threshold value is 5, predetermined number is 3, current time is 7:10, the detailed description of the invention of such scheme is: first passes through bench test and sets up the corresponding relation between different engine speed and distributive value and the calibration value of exhaust gas temperature sensor, storage in memory, then carries out following steps:
1) according to 7:00-7:10 intrinsic motivation rotating speed and the corresponding relation of distributive value and time, and the corresponding relation between the different engine speed prestored and distributive value and exhaust gas temperature sensor calibration value, set up the exhaust gas temperature sensor calibration value function about the time, and to calculate this functional value meansigma methods in 7:00-7:10 be 30;
2) set up in 7:00-7:10 exhaust gas temperature sensor actual value about the function of time, and to calculate this function meansigma methods in 7:00-7:10 be 20;
3) due to | 30-20 | > 5, counting is once.
During 7:20, time period 7:10-7:20 is performed and above-mentioned steps 1 again)��3) similar operations, then until 7:30, time period 7:20-7:30 is performed and above-mentioned steps 1 again)��3) similar operations ... when cumulative number reaches 3 times, it is determined that exhaust gas temperature sensor lost efficacy.
In the specific implementation, step S0 sets up the corresponding relation between different engine speed and distributive value and the calibration value of exhaust gas temperature sensor, it is possible to set up according to historical experience value, it is also possible to set up according to result of the test.
Such as: set up the corresponding relation between different engine speed and distributive value and the calibration value of exhaust gas temperature sensor by stand or complete vehicle test: with engine speed for abscissa, distributive value is transverse and longitudinal coordinate, demarcates the delivery temperature corresponding to different engine and distributive value by bench test or complete vehicle test.
When being embodied as, timing signal is being carried out by bench test, consider under certain engine speed and distributive value, connect SCR (SelectiveCatalyticReduction, SCR technology) the upstream exhaust pipeline of device is more long, aerofluxus temperature drop can be more big, and in order to ensure the accuracy of nominal data, when stand is arranged, upstream exhaust pipeline length is as far as possible close to car load virtual condition.
Understandable it is, step S1 determines the meansigma methods of calibration value within this time period according to the corresponding relation between engine speed and distributive value from the corresponding relation of time and described different engine speed and distributive value and the calibration value of exhaust gas temperature sensor, need first to set up the calibration value of exhaust gas temperature sensor and the corresponding relation of time according to the corresponding relation between engine speed and distributive value from the corresponding relation of time and described different engine speed and distributive value and the calibration value of exhaust gas temperature sensor, namely the calibration value function about the time of exhaust gas temperature sensor is set up, then this functional value meansigma methods within the time period of the first preset length is sought.
Calculating the meansigma methods of exhaust gas temperature sensor measured value in this time period in step S2 is the measured value the setting up exhaust gas temperature sensor function about the time, then seeks this functional value meansigma methods within the time period of the first preset length.
Judging in step S3 that whether the absolute value of difference of two meansigma methodss is more than predetermined threshold value, described predetermined threshold value can be configured according to the temperature of the type of exhaust gas temperature sensor, sensitivity and external environment condition, pressure.
In step S4 when the number of the time period more than predetermined threshold value is more than predetermined number, it is determined that described exhaust gas temperature sensor lost efficacy, and described predetermined threshold value and predetermined number can be configured according to actual needs.
As shown in Figure 2, it is preferable that, described method also includes:
Step S5, when judge described exhaust gas temperature sensor lost efficacy after, send alarm.
It is understandable that, after exhaust gas temperature sensor lost efficacy, sending alarm can remind driver to carry out trouble shooting in time, the emitted dose of urea solution in exhaustor is affected to avoid the occurrence of after exhaust gas temperature sensor lost efficacy, thus exhaust emissions exceeds standard in the vehicle operation caused, or owing to the urea solution in exhaustor sprays too much urea solution crystallization unnecessary in the exhaustor caused.
Preferably, described method also includes:
Step S6, when judge described exhaust gas temperature sensor lost efficacy after, the calibration value of the exhaust gas temperature sensor corresponding to the engine speed of current time and distributive value is exported as the measured value of current time exhaust gas temperature sensor.
It is understandable that, after judging that described exhaust gas temperature sensor lost efficacy, obtaining after as the measured value of current time exhaust gas temperature sensor, the calibration value of the exhaust gas temperature sensor corresponding to the engine speed of current time and distributive value can ensure that exhaust gas temperature sensor lost efficacy, SCR system can also run well.
Preferably, described method also includes:
Step S7, according to the ambient temperature of current time and ambient pressure, described calibration value is modified.
It is understandable that, even if engine speed is identical with distributive value, under different ambient temperatures and ambient pressure, the measured value of exhaust gas temperature sensor also can change, therefore according to the ambient temperature of current time and ambient pressure, described calibration value is modified, can ensure that calibration value more can reflect the working condition of exhaust gas temperature sensor when car load runs truly, the revised calibration value of later use goes whether detection measured value has deviation, can improve the accuracy judging whether sensor lost efficacy.
Preferably, described step S1 specifically includes:
Step S11, for reaching the pre-conditioned each sub-time period, determine the integrated value of calibration value within this sub-time period according to the corresponding relation between engine speed and distributive value from the corresponding relation of time and described different engine speed and distributive value and the calibration value of exhaust gas temperature sensor;
Step S12, using each integrated value determined and with meet the pre-conditioned each sub-time period length and ratio as the meansigma methods of calibration value in this time period;
Described step S2 specifically includes:
Step S21, for reaching the pre-conditioned each sub-time period, calculate the integrated value of exhaust gas temperature sensor measured value in this sub-time period;
Step S22, using each integrated value determined and with meet the pre-conditioned each sub-time period length and ratio as the meansigma methods of calibration value in this time period;
Wherein, described pre-conditioned be: engine speed is not less than preset rotation speed, and engine coolant temperature be not less than preset temperature, and in the sub-time period amplitude of variation of the measured value of described exhaust gas temperature sensor in pre-set interval.
Alternatively, described preset rotation speed, preset temperature, pre-set interval can be set according to the practical situation such as engine type, ambient temperature.
It is understandable 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 described exhaust gas temperature sensor can ensure that in pre-set interval electromotor has begun to steady operation in sub-time period, now in exhaustor delivery temperature in a stable excursion, it is possible to reduce the misinterpretation of the sensor failure that the measured value of exhaust gas temperature sensor brings due to external disturbance acute variation at short notice.
It is understandable that, the time period of the first preset length is divided into several sub-time periods, to meeting the pre-conditioned sub-time period, calibration value and measured value are quadratured respectively, and for being unsatisfactory for the pre-conditioned sub-time period, calibration value and measured value are not quadratured, the difference between meansigma methods and the meansigma methods of measured value of the calibration value finally calculated can be made more truly to reflect exhaust gas temperature sensor measured deviation in real work situation, it is possible to reduce due to the erroneous judgement of the exhaust gas temperature sensor inefficacy that some external disturbance are brought.
As it is shown on figure 3, the invention allows for the detecting device 100 that a kind of exhaust gas temperature sensor lost efficacy, including:
Set up unit 101, for when, after engine start, setting up the corresponding relation between different engine speed and distributive value and the calibration value of exhaust gas temperature sensor;
Determine unit 102, for when after engine start, for each time period in the time period of multiple first preset length of continuous print, determine that the first meansigma methods, described first meansigma methods are the meansigma methods of the calibration value within this time period according to the corresponding relation between engine speed and distributive value from the corresponding relation of time and described different engine speed and distributive value and the calibration value of exhaust gas temperature sensor;
Computing unit 103, for when after engine start, for each time period in the time period of multiple first preset length of continuous print, calculating the second meansigma methods, described second meansigma methods is the meansigma methods of the exhaust gas temperature sensor measured value in this time period;
Comparing unit 104, for when after engine start, for each time period in the time period of multiple first preset length of continuous print, it is judged that whether the absolute value of the difference of the first meansigma methods and the second meansigma methods is more than predetermined threshold value;
Judging unit 105, for when after engine start, when the number of the time period more than predetermined threshold value is more than predetermined number, it is determined that described exhaust gas temperature sensor lost efficacy.
Preferably, it is shown that device also includes:
Alarm unit, for, after judging that described exhaust gas temperature sensor lost efficacy, sending alarm.
Preferably, it is shown that device also includes:
Output unit, for, after judging that described exhaust gas temperature sensor lost efficacy, exporting the calibration value of the exhaust gas temperature sensor corresponding to the engine speed of current time and distributive value as the measured value of current time exhaust gas temperature sensor.
Preferably, described device also includes:
Amending unit, for the ambient temperature according to current time and ambient pressure, is modified described calibration value.
Preferably, described determine that unit specifically includes:
First integral subelement, for for reaching the pre-conditioned each sub-time period, determining the integrated value of calibration value within this sub-time period according to the corresponding relation between engine speed and distributive value from the corresponding relation of time and described different engine speed and distributive value and the calibration value of exhaust gas temperature sensor;
First mean value calculation subelement, for using each integrated value determined and with meet the pre-conditioned each sub-time period length and ratio as the meansigma methods of calibration value in this time period;
Described computing unit specifically includes:
Second integral subelement, for for reaching the pre-conditioned each sub-time period, calculating the integrated value of exhaust gas temperature sensor measured value in this sub-time period;
Second mean value calculation subelement, for using each integrated value determined and with meet the pre-conditioned each sub-time period length and ratio as the meansigma methods of calibration value in this time period;
Wherein, described pre-conditioned be: engine speed is not less than preset rotation speed, and engine coolant temperature be not less than preset temperature, and in the sub-time period amplitude of variation of the measured value of described exhaust gas temperature sensor in pre-set interval.
To sum up, the detection method that a kind of exhaust gas temperature sensor provided by the invention lost efficacy, judge that whether the absolute value of difference between meansigma methods and the meansigma methods of calibration value of the exhaust gas temperature sensor measured value in each time period in the time period of multiple first preset length of continuous print is more than predetermined threshold value, when the number of the time period more than predetermined threshold value is more than predetermined number, judge that described exhaust gas temperature sensor lost efficacy, technical scheme provided by the invention can realize the measurement error detection in the whole work process of exhaust gas temperature sensor, compared to existing technology, can judge when exhaust gas temperature sensor measured value is without departing from the upper and lower bound measured, whether measured value exists deviation.
In the present invention, term " first ", " second " only for descriptive purposes, and it is not intended that instruction or hint relative importance. Term " multiple " refers to two or more, unless otherwise clear and definite restriction.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations. All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.

Claims (10)

1. the detection method that an exhaust gas temperature sensor lost efficacy, it is characterised in that including:
Set up the corresponding relation between different engine speed and distributive value and the calibration value of exhaust gas temperature sensor; Also include: when after engine start, for each time period in the time period of multiple first preset length of continuous print, perform step S1-step S3:
Step S1, determine that the first meansigma methods, described first meansigma methods are the meansigma methods of the calibration value in this time period according to the corresponding relation between engine speed and distributive value from the corresponding relation of time and described different engine speed and distributive value and the calibration value of exhaust gas temperature sensor;
Step S2, calculating the second meansigma methods, described second meansigma methods is the meansigma methods of the exhaust gas temperature sensor measured value in this time period;
Step S3, judge that whether the absolute value of difference of the first meansigma methods and the second meansigma methods is more than predetermined threshold value;
When the number of the time period more than predetermined threshold value is more than predetermined number, it is determined that described exhaust gas temperature sensor lost efficacy.
2. the detection method that exhaust gas temperature sensor according to claim 1 lost efficacy, it is characterised in that also include:
After judging that described exhaust gas temperature sensor lost efficacy, send alarm.
3. the detection method that exhaust gas temperature sensor according to claim 1 lost efficacy, it is characterised in that also include:
After judging that described exhaust gas temperature sensor lost efficacy, the calibration value of the exhaust gas temperature sensor corresponding to the engine speed of current time and distributive value is exported as the measured value of current time exhaust gas temperature sensor.
4. the detection method that exhaust gas temperature sensor according to claim 1 lost efficacy, it is characterised in that also include:
Ambient temperature according to current time and ambient pressure, be modified described calibration value.
5. the detection method that exhaust gas temperature sensor as claimed in claim 1 lost efficacy, it is characterised in that described step S1 specifically includes:
For reaching the pre-conditioned each sub-time period, determine the integrated value of calibration value within this sub-time period according to the corresponding relation between engine speed and distributive value from the corresponding relation of time and described different engine speed and distributive value and the calibration value of exhaust gas temperature sensor;
Using each integrated value determined and with meet the pre-conditioned each sub-time period length and ratio as the meansigma methods of calibration value in this time period;
Described step S2 specifically includes:
For reaching the pre-conditioned each sub-time period, calculate the integrated value of exhaust gas temperature sensor measured value in this sub-time period;
Using each integrated value determined and with meet the pre-conditioned each sub-time period length and ratio as the meansigma methods of calibration value in this time period;
Wherein, described pre-conditioned be: engine speed is not less than preset rotation speed, and engine coolant temperature be not less than preset temperature, and in the sub-time period amplitude of variation of the measured value of described exhaust gas temperature sensor in pre-set interval.
6. the detecting device that an exhaust gas temperature sensor lost efficacy, it is characterised in that including:
Set up unit, for setting up the corresponding relation between different engine speed and distributive value and the calibration value of exhaust gas temperature sensor;
Determine unit, for when after engine start, for each time period in the time period of multiple first preset length of continuous print, determine that the first meansigma methods, described first meansigma methods are the meansigma methods of the calibration value within this time period according to the corresponding relation between engine speed and distributive value from the corresponding relation of time and described different engine speed and distributive value and the calibration value of exhaust gas temperature sensor;
Computing unit, for when after engine start, for each time period in the time period of multiple first preset length of continuous print, calculating the second meansigma methods, described second meansigma methods is the meansigma methods of the exhaust gas temperature sensor measured value in this time period;
Comparing unit, for when after engine start, for each time period in the time period of multiple first preset length of continuous print, it is judged that whether the absolute value of the difference of the first meansigma methods and the second meansigma methods is more than predetermined threshold value;
Judging unit, for when after engine start, when the number of the time period more than predetermined threshold value is more than predetermined number, it is determined that described exhaust gas temperature sensor lost efficacy.
7. the detecting device that exhaust gas temperature sensor according to claim 6 lost efficacy, it is characterised in that also include:
Alarm unit, for, after judging that described exhaust gas temperature sensor lost efficacy, sending alarm.
8. the detecting device that exhaust gas temperature sensor according to claim 6 lost efficacy, it is characterised in that also include:
Output unit, for, after judging that described exhaust gas temperature sensor lost efficacy, exporting the calibration value of the exhaust gas temperature sensor corresponding to the engine speed of current time and distributive value as the measured value of current time exhaust gas temperature sensor.
9. the detecting device that exhaust gas temperature sensor according to claim 6 lost efficacy, it is characterised in that also include:
Amending unit, for the ambient temperature according to current time and ambient pressure, is modified described calibration value.
10. the detecting device that exhaust gas temperature sensor as claimed in claim 6 lost efficacy, it is characterised in that described determine that unit specifically includes:
First integral subelement, for for reaching the pre-conditioned each sub-time period, determining the integrated value of calibration value within this sub-time period according to the corresponding relation between engine speed and distributive value from the corresponding relation of time and described different engine speed and distributive value and the calibration value of exhaust gas temperature sensor;
First mean value calculation subelement, for using each integrated value determined and with meet the pre-conditioned each sub-time period length and ratio as the meansigma methods of calibration value in this time period;
Described computing unit specifically includes:
Second integral subelement, for for reaching the pre-conditioned each sub-time period, calculating the integrated value of exhaust gas temperature sensor measured value in this sub-time period;
Second mean value calculation subelement, for using each integrated value determined and with meet the pre-conditioned each sub-time period length and ratio as the meansigma methods of calibration value in this time period;
Wherein, described pre-conditioned be: engine speed is not less than preset rotation speed, and engine coolant temperature be not less than preset temperature, and in the sub-time period amplitude of variation of the measured value of described exhaust gas temperature sensor in pre-set interval.
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