CN110107389B - A kind of creditability detection method and device of temperature sensor - Google Patents

A kind of creditability detection method and device of temperature sensor Download PDF

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Publication number
CN110107389B
CN110107389B CN201910610663.8A CN201910610663A CN110107389B CN 110107389 B CN110107389 B CN 110107389B CN 201910610663 A CN201910610663 A CN 201910610663A CN 110107389 B CN110107389 B CN 110107389B
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China
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temperature
difference
temperature sensor
moment
observed
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CN110107389A (en
Inventor
胡金金
张娟
邱东
闫立冰
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/02Adding substances to exhaust gases the substance being ammonia or urea
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/14Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1433Pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04Methods of control or diagnosing
    • F01N2900/0416Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas sensor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04Methods of control or diagnosing
    • F01N2900/0422Methods of control or diagnosing measuring the elapsed time
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/40Engine management systems

Abstract

The embodiment of the present application discloses the creditability detection method and device of a kind of temperature sensor, and temperature sensor therein can be the temperature sensor of urea pump or pump the temperature sensor of heater.The pump heater can be used for heating the urea pump.This method comprises: when urea pump is in heating mode, when i.e. pump heater heats urea pump, the observed temperature of available temperature sensor is poor, wherein the observed temperature difference can be that the temperature sensor detects under physical condition from moment t1 to the difference of the temperature of moment t2.After obtaining observed temperature difference, can also obtain that the corresponding theoretical temperatures of observed temperature difference are poor, the theoretical temperatures difference can be that calculated normal temperature sensor should detect under the physical condition from moment t1 to the difference of the temperature of moment t2.Can determine whether the temperature sensor is credible according to the relationship of observed temperature difference and theoretical temperatures difference.

Description

A kind of creditability detection method and device of temperature sensor
Technical field
This application involves detection technique fields, more particularly to the creditability detection method and dress of a kind of temperature sensor It sets.
Background technique
Selective catalytic oxidation (Selective Catalytic Reduction, SCR) system can be used for reducing automobile The discharge of nitrogen oxides of exhaust gas.Its working principle is that: spray urea before SCR case, allow to generate NH3 and in exhaust gas Reaction of nitrogen oxides, to achieve the purpose that denitrification.It is directed to the acquisition of urea in SCR system, it is mainly logical It crosses urea pump to draw urea from urea box and pressurize, to be sent to the urea nozzle of SCR case by corresponding pipeline.Its In, if the environment temperature where current vehicle is lower, it is also necessary to be heated by pumping heater to urea pump, to prevent from inhaling The urea liquid into urea pump is taken to freeze.
It, can be respectively by their temperature sensor, to determine pump in the course of work of urea pump and pump heater Whether heater is in normal condition to the heating process of urea pump.If being appreciated that the temperature sensor and pump of urea pump In the case that the temperature sensor of heater breaks down, it may occur that pump heater to the mistake of the heated condition of urea pump Sentence.Therefore, the credible detection of the temperature sensor of the temperature sensor of urea pump and pump heater is very important.
Currently, not there is the credible detection of the temperature sensor of the temperature sensor for being directed to urea pump and pump heater Method.Therefore, how the credibility of the temperature sensor of the temperature sensor and pump heater of urea pump is detected, is mesh The problem of preceding urgent need to resolve.
Summary of the invention
In order to solve the above-mentioned technical problem, this application provides a kind of creditability detection method of temperature sensor and dresses It sets, to determine the credibility of the temperature sensor of urea pump and the temperature sensor of pump heater.
The embodiment of the present application discloses following technical solution:
In a first aspect, the embodiment of the present application provides a kind of creditability detection method of temperature sensor, the temperature is passed Sensor is the temperature sensor of urea pump or the temperature sensor for pumping heater, wherein the pump heater is used for described Urea pump heating, which comprises
If the urea pump is in heating mode, the observed temperature for obtaining the temperature sensor is poor, the observed temperature Difference be the temperature sensor detected under physical condition from moment t1 to the temperature difference of moment t2;
It is poor to obtain the poor corresponding theoretical temperatures of the observed temperature, the theoretical temperatures difference is calculated normal temperature biography Sensor with the physical condition should detect under the same conditions from the moment t1 to the temperature difference of the moment t2;
According to the relationship of the observed temperature difference and the theoretical temperatures difference, determine whether the temperature sensor is credible.
Optionally, the observed temperature difference be the first observed temperature detect in the moment t1 and the moment t1 extremely The difference of the maximum observed temperature detected in the moment t2;The theoretical temperatures difference is the normal temperature sensor described The first theoretical temperatures that moment t1 should be detected and the difference in the moment t2 the second theoretical temperatures that should be detected.
Optionally, the physical condition includes ambient temperature conditions.
Optionally, the time of the moment t1 to the moment t2 is preset fixed duration, if in the moment t1 The heating mode of the urea pump is interrupted in the time of the moment t2, and is interrupting the urea pump after a certain period of time Heating mode is restarted;
Then, the observed temperature for obtaining the temperature sensor is poor, comprising:
If the time interrupted is less than break period threshold value, and interrupts temperature difference and is less than interruption temperature difference threshold value, then, described Observed temperature difference is to determine before being interrupted according to the heating mode with the temperature for being restarted the rear temperature sensor detection, Wherein, the interruption temperature difference be the temperature sensor when the heating mode is interrupted with detected respectively when being restarted Temperature difference.
Optionally, the observed temperature for obtaining the temperature sensor is poor, further includes:
If the time of the interruption is not less than the break period threshold value or the interruption temperature difference not less than described Temperature difference threshold value is interrupted, the observed temperature difference is that the temperature of the rear temperature sensor detection is restarted according to the heating mode Degree determination.
Optionally, if the urea pump is in non-heated mode, and vehicle starts to start, the method also includes:
Determine the basal temperature of the temperature sensor detection and the first temperature difference of environment temperature;
If first temperature difference is not higher than basal temperature difference threshold value, determine that the temperature sensor is credible;
If first temperature difference is higher than the basal temperature difference threshold value, according to the mild selective catalytic oxidation of engine water The upstream temperature of SCR system determines whether the environment temperature is accurate;
If it is determined that the environment temperature is accurate, determine that the temperature sensor is insincere;
If it is determined that environment temperature inaccuracy, according to the mild selective catalytic oxidation SCR system of the engine water The upstream temperature of system redefines the environment temperature;
Determine that second temperature is poor according to the environment temperature redefined and the basal temperature;
If the second temperature difference is higher than the basal temperature difference threshold value, determine that the temperature sensor is insincere;
If the second temperature difference is not higher than the basal temperature difference threshold value, determine that the temperature sensor is credible.
Optionally, the relationship according to the observed temperature difference and the theoretical temperatures difference, determines the temperature sensing Whether device is credible, comprising:
It is poor to determine whether the observed temperature difference is lower than theoretical temperatures;
If so, determining that the temperature sensor is insincere;
If it is not, determining that the temperature sensor is credible.
Second aspect, the embodiment of the present application provide a kind of credible detection device of temperature sensor, and the temperature passes Sensor is the temperature sensor of urea pump or the temperature sensor for pumping heater, wherein the pump heater is used for described Urea pump heating, described device include:
First acquisition unit obtains the actual measurement temperature of the temperature sensor if being in heating mode for the urea pump It is poor to spend, and the observed temperature difference is the temperature difference of t1 to moment t2 at the time of the temperature sensor detects under physical condition;
Second acquisition unit, poor for obtaining the corresponding theoretical temperatures of the observed temperature difference, the theoretical temperatures difference is Calculated normal temperature sensor is in the moment t1 that should be detected under the same conditions with the physical condition to described The temperature difference of moment t2;
First determination unit determines the temperature for the relationship according to the observed temperature difference and the theoretical temperatures difference Whether credible spend sensor.
Optionally, the observed temperature difference be the first observed temperature detect in the moment t1 and the moment t1 extremely The difference of the maximum observed temperature detected in the moment t2;The theoretical temperatures difference is the normal temperature sensor described The first theoretical temperatures that moment t1 should be detected and the difference in the moment t2 the second theoretical temperatures that should be detected.
Optionally, the physical condition includes ambient temperature conditions.
Optionally, the first acquisition unit, also particularly useful for:
The time of the moment t1 to the moment t2 be preset fixed duration, if the moment t1 to it is described when The heating mode for carving the urea pump in the time of t2 is interrupted, and in the heating mode for interrupting the urea pump after a certain period of time It is restarted;
If the time interrupted is less than break period threshold value, and interrupts temperature difference and is less than interruption temperature difference threshold value, then, described Observed temperature difference is to determine before being interrupted according to the heating mode with the temperature for being restarted the rear temperature sensor detection, Wherein, the interruption temperature difference be the temperature sensor when the heating mode is interrupted with detected respectively when being restarted Temperature difference.
Optionally, the first acquisition unit, also particularly useful for:
If the time of the interruption is not less than the break period threshold value or the interruption temperature difference not less than described Temperature difference threshold value is interrupted, the observed temperature difference is that the temperature of the rear temperature sensor detection is restarted according to the heating mode Degree determination.
Optionally, described device further includes the second determination unit, and second determination unit is used for:
If the urea pump is in non-heated mode, and vehicle starts to start, and determines the base of the temperature sensor detection First temperature difference of plinth temperature and environment temperature;
If first temperature difference is not higher than basal temperature difference threshold value, determine that the temperature sensor is credible;
If first temperature difference is higher than the basal temperature difference threshold value, according to the mild selective catalytic oxidation of engine water The upstream temperature of SCR system determines whether the environment temperature is accurate;
If it is determined that the environment temperature is accurate, determine that the temperature sensor is insincere;
If it is determined that environment temperature inaccuracy, according to the mild selective catalytic oxidation SCR system of the engine water The upstream temperature of system redefines the environment temperature;
Determine that second temperature is poor according to the environment temperature redefined and the basal temperature;
If the second temperature difference is higher than the basal temperature difference threshold value, determine that the temperature sensor is insincere;
If the second temperature difference is not higher than the basal temperature difference threshold value, determine that the temperature sensor is credible.
Optionally, first determination unit, is specifically used for:
It is poor to determine whether the observed temperature difference is lower than theoretical temperatures;
If so, determining that the temperature sensor is insincere;
If it is not, determining that the temperature sensor is credible.
The creditability detection method of temperature sensor provided by the present application, therein it can be seen from above-mentioned technical proposal Temperature sensor can be the temperature sensor of urea pump or pump the temperature sensor of heater.The pump heater can be used It is heated in the urea pump.The creditability detection method includes: the i.e. pump heating when urea pump is in heating mode When device heats urea pump, the observed temperature of available temperature sensor is poor, wherein the observed temperature difference can be this Temperature sensor detected under physical condition from moment t1 to the difference of the temperature of moment t2.Obtaining observed temperature difference Afterwards, it can also obtain that the corresponding theoretical temperatures of observed temperature difference are poor, which can be calculated normal temperature Sensor should be detected under the physical condition from moment t1 to the difference of the temperature of moment t2.Since the theoretical temperatures are poor Correspond to it is calculated when the temperature sensor is normal temperature sensor (i.e. the temperature sensor is credible), therefore, can be with According to the relationship of observed temperature difference and theoretical temperatures difference, determine whether the temperature sensor is credible.To can determine that urea The credibility of the temperature sensor of the temperature sensor and pump heater of pump.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of application without any creative labor, may be used also for those of ordinary skill in the art To obtain other drawings based on these drawings.
Fig. 1 is a kind of creditability detection method flow chart of temperature sensor provided by the embodiments of the present application;
Fig. 2 is a kind of whether believable method flow diagram of temperature sensor provided by the embodiments of the present application;
Fig. 3 is a kind of method flow diagram of observed temperature difference for obtaining temperature sensor provided by the embodiments of the present application;
Fig. 4 is the creditability detection method flow chart of another temperature sensor provided by the embodiments of the present application;
Fig. 5 is the creditability detection method flow chart of another temperature sensor provided by the embodiments of the present application;
Fig. 6 is a kind of credible structure diagram of detection device of temperature sensor provided by the embodiments of the present application.
Specific embodiment
With reference to the accompanying drawing, embodiments herein is described.
Currently, not there is the credible detection of the temperature sensor of the temperature sensor for being directed to urea pump and pump heater Method.Therefore, how the credibility of the temperature sensor of the temperature sensor and pump heater of urea pump is detected, is mesh The problem of preceding urgent need to resolve.
For this purpose, the embodiment of the present application provides a kind of creditability detection method of temperature sensor, wherein the temperature passes Sensor can be the temperature sensor of urea pump or pump the temperature sensor of heater.The pump heater can be used for institute Urea pump is stated to be heated.This method comprises: i.e. pump heater heats urea pump when urea pump is in heating mode When, the observed temperature of available temperature sensor is poor, wherein the observed temperature difference can be the temperature sensor in practical item Detected under part from moment t1 to the temperature difference of moment t2.After obtaining observed temperature difference, the observed temperature can also be obtained The corresponding theoretical temperatures of difference are poor, which can be calculated normal temperature sensor and answer under the physical condition Detect from moment t1 to the temperature difference of moment t2.It is positive room temperature since the theoretical temperatures difference corresponds to the temperature sensor It is calculated when degree sensor (i.e. the temperature sensor is credible), therefore, can be poor according to observed temperature difference and theoretical temperatures Relationship determines whether the temperature sensor is credible.To can determine that the temperature sensor of urea pump and the temperature of pump heater Spend the credibility of sensor.
Next, will combine Fig. 1 to a kind of creditability detection method of temperature sensor provided by the embodiments of the present application into Row is introduced.
It is to be appreciated that the creditability detection method of temperature sensor provided by the embodiments of the present application, can be applied to urea The credible detection of the temperature sensor of pump can be also used for the credible detection of the temperature sensor of pump heater.Wherein, institute Stating pump heater can heat using to the urea pump.
Referring to Fig. 1, the figure shows a kind of creditability detection method streams of temperature sensor provided by the embodiments of the present application Cheng Tu, as shown in Figure 1, this method may include:
S101: if the urea pump is in heating mode, the observed temperature for obtaining the temperature sensor is poor, the actual measurement Temperature difference be the temperature sensor detected under physical condition from moment t1 to the difference of the temperature of moment t2.
In the embodiment of the present application, if urea pump is in heating mode, i.e., pump heater is being urea pump heating, Then, the observed temperature of available temperature sensor is poor.Wherein, the observed temperature difference can be temperature sensor in practical item Detected under part from moment t1 to the difference of the temperature of moment t2.
It is to be appreciated that the physical condition can be used for actual scene locating for scaling temp sensor.For example: if Temperature sensor for credibility detection is the temperature sensor of urea pump, then the physical condition may include: urea pump Model, for urea pump heating pump heater model etc..
In one possible implementation, the physical condition may include ambient temperature conditions, the environment temperature It can be environment temperature of the temperature sensor when detection is from moment t1 to the temperature of moment t2.
In addition, the moment t1 and moment t2 can be the timing since when urea pump opens heating mode, that is, It says, the moment t1 and moment t2 are relative times.For example, if urea pump opens heating mode in morning 10:00, Moment t1 can correspond to the morning 10:01 when being 1 minute, moment t2 can correspond to the morning 10:03 when being 3 minutes.
In one possible implementation, it is poor to be directed to the observed temperature, for example can be temperature sensor and exist First observed temperature of moment t1 detectionWith the maximum observed temperature detected in moment t1 to the moment t2Difference. In this manner it is ensured that observed temperature difference can fully demonstrate in this time that temperature sensor is detected from moment t1 to moment t2 Temperature change value.
S102: it is poor that the corresponding theoretical temperatures of the observed temperature difference are obtained.
In the embodiment of the present application, the corresponding theoretical temperatures of available observed temperature difference are poor, wherein the theoretical temperatures Difference, which can be, to be determined by calculation out, and the theoretical temperatures difference can be normal temperature sensor with the physical condition Should detect under the same conditions from moment t1 to the difference of the temperature of moment t2.
It is to be appreciated that the theoretical temperatures for being directed to acquisition are poor, corresponding condition should reality corresponding with observed temperature difference Border condition is identical.That is, when determining theoretical temperatures difference temperature should be being detected with the temperature sensor in S101 Under conditions of carry out.
In addition, t1 and moment t2 also belongs to relative time at the time of in theoretical temperatures difference.
For example, for example the theoretical temperatures difference can be what the data based on computer calibration obtained.
In one possible implementation, the theoretical temperatures difference can be normal temperature sensor and should examine in moment t1 The first theoretical temperatures measuredWith the second theoretical temperatures that should be detected in moment t2Difference.
S103: according to the relationship of the observed temperature difference and the theoretical temperatures difference, whether the temperature sensor is determined It is credible.
After getting observed temperature difference and theoretical temperatures difference, the temperature can be determined according to the relationship between them Whether credible spend sensor.
In one possible implementation, the method for being directed to the S103, referring to fig. 2, the figure shows the application The whether believable method flow diagram of a kind of temperature sensor that embodiment provides, the method may include:
S201: it is poor to determine whether the observed temperature difference is lower than theoretical temperatures, if so, S202 is executed, if it is not, executing S203。
S202: determine that the temperature sensor is insincere.
S203: determine that the temperature sensor is credible.
It is appreciated that if temperature sensor is normal temperature sensor, the temperature of measurement should be accurately, So, the observed temperature difference obtained based on temperature sensor measured temperature should be poor not less than theoretical temperatures.It, can be true based on this It is poor whether the fixed observed temperature is lower than theoretical temperatures, if so, determine that the temperature sensor is fault sensor, i.e., it is described Temperature sensor is insincere;If not, it is determined that the temperature sensor is nominal sensor, i.e., the described temperature sensor is credible.
In conclusion the creditability detection method of temperature sensor provided by the present application, temperature sensor therein can be with It is the temperature sensor of urea pump or the temperature sensor for pumping heater.The pump heater can be used for the urea pump It is heated.The creditability detection method includes: when urea pump is in heating mode, i.e., pump heater carries out urea pump When heating, the observed temperature of available temperature sensor is poor, wherein the observed temperature difference can be the temperature sensor in reality Detected under the conditions of border from moment t1 to the difference of the temperature of moment t2.After obtaining observed temperature difference, this can also be obtained The corresponding theoretical temperatures of observed temperature difference are poor, which can be calculated normal temperature sensor in the reality Under the conditions of should detect from moment t1 to the difference of the temperature of moment t2.It is passed since the theoretical temperatures difference corresponds to the temperature Sensor be normal temperature sensor (i.e. the temperature sensor is credible) when it is calculated, therefore, can according to observed temperature difference with The relationship of theoretical temperatures difference determines whether the temperature sensor is credible.To, that is, can determine that urea pump temperature sensor and Pump the credibility of the temperature sensor of heater.
In one possible implementation, if being preset fixed duration from moment t1 to the time of moment t2, than As: observed temperature is poor and theoretical temperatures difference is all obtaining in one section of fixed duration.So, if in moment t1 to moment t2 This period in the heating mode of urea pump be interrupted, and be restarted in the heating mode for interrupting urea pump after a certain period of time, Temperature data (including heating time and corresponding temperature) preservation before heating mode being interrupted is write to erasable In read-only memory (Electrically Erasable Programmable Read-Only Memory, EEPROM).
The method for being directed to S101, referring to Fig. 3, the figure shows a kind of acquisition temperature sensing provided by the embodiments of the present application The method flow diagram of the observed temperature difference of device, the method may include:
S301: it if the time interrupted is less than break period threshold value, and interrupts temperature difference and is less than interruption temperature difference threshold value, institute Stating observed temperature difference is to determine before being interrupted according to the heating mode with the temperature for being restarted the rear temperature sensor detection , wherein the interruption temperature difference be the temperature sensor when the heating mode is interrupted with examined respectively when being restarted The difference of the temperature measured.
It is appreciated that the heating mode of urea pump may be interrupted, such as vehicle stall etc. in actual scene.So, If the heating mode of (process of temperature sensor detection temperature) urea pump is interrupted within the time of moment t1 to moment t2, Again interrupt be restarted after a certain period of time, be based on this kind of situation, the acquisition for observed temperature difference, if interruption time compared with It is short, and in the case that temperature difference when interrupting and when restarting is little, it is believed that this time interruption of heating mode is real to determining The influence of testing temperature difference is smaller.Therefore, temperature data and urea pump heating before being interrupted based on urea pump heating mode Mode be restarted after temperature data, determine that observed temperature is poor.
It is thus possible to default break period threshold value, with the length of the break period for identifying heating mode.It can also be pre- If interrupting temperature difference threshold value, with the variation size for identifying the temperature during heating mode interrupts.
If it is determined that the time interrupted is less than break period threshold value, and interrupts temperature difference and is less than interruption temperature difference threshold value, that , observed temperature difference is to determine before being interrupted according to the heating mode with the temperature for being restarted the rear temperature sensor detection , interruption temperature difference described here can be temperature sensor when heating mode is interrupted with detected respectively when being restarted Temperature difference.
In addition, in one possible implementation, the side of the observed temperature difference of the acquisition temperature sensor in S101 Method can also include:
S302: if the time of the interruption is not small not less than the break period threshold value or the interruption temperature difference In the interruption temperature difference threshold value, the observed temperature difference is that the rear temperature sensor inspection is restarted according to the heating mode What the temperature of survey determined.
If it is determined that the time interrupted is not less than break period threshold value, alternatively, interrupting temperature difference not less than interruption temperature difference Threshold value, it may be considered that this time interruption of heating mode is affected to determining observed temperature difference.It therefore, can be in heated mould After formula is restarted, redeterminating for temperature is carried out, so that it is poor to obtain observed temperature.
As it can be seen that by determining influence of the interruption of heating mode to observed temperature difference is determined, if influence it is smaller, still can be with Using the temperature data before interruption, to improve the efficiency for obtaining observed temperature difference.
In the embodiment of the present application, if urea pump is in non-heated mode, and work as the electronic control unit of vehicle When (Electronic Control Unit, ECU) is powered on, vehicle starts to start (i.e. the cold start-up of vehicle), as a result, referring to figure 4, the figure shows the creditability detection method flow chart of another temperature sensor provided by the embodiments of the present application, the methods May include:
S401: the basal temperature of the temperature sensor detection and the first temperature difference of environment temperature are determined.
S402: if first temperature difference is not higher than basal temperature difference threshold value, determine that the temperature sensor is credible.
It in the embodiment of the present application, can be with the first temperature of the temperature sensor basal temperature detected and environment temperature Difference, wherein the basal temperature can be the temperature of temperature sensor current detection, and the environment temperature can be by for examining The temperature for the current environment that the temperature sensor of survey environment temperature detects.Thus, it is possible to determine the first temperature difference.
It is appreciated that if temperature sensor is normal (not breaking down), the basal temperature and environment temperature First temperature gap should be smaller, in order to identify the size degree of the first temperature gap, can preset a basal temperature difference threshold Value determines that the temperature sensor does not break down, i.e. institute if first temperature difference is not higher than the basal temperature difference threshold value It is credible to state temperature sensor.
S403: it if first temperature difference is higher than the basal temperature difference threshold value, is mildly selectively urged according to engine water The upstream temperature for changing oxidation SCR system determines whether the environment temperature is accurate.If accurate, S404 is executed;If inaccurate, execute S405。
S404: determine that the temperature sensor is insincere.
S405: it is redefined according to the upstream temperature of the mild selective catalytic oxidation SCR system of the engine water The environment temperature.
It in the embodiment of the present application, can be first if first temperature gap is higher than the basal temperature difference threshold value Determine whether the environment temperature measured is accurate.
It is appreciated that current method is executed when vehicle starts starting, at this point, the mild SCR system of engine water Upstream temperature and environment temperature be close, thus, it is possible to determine ring according to the upstream temperature of the mild SCR system of engine water Whether border temperature is accurate, if accurately, executing S404, that is, determining that the temperature sensor is insincere.If inaccurate, S405 is executed, Environment temperature can be redefined according to the upstream temperature of the mild SCR system of engine water.
S406: determine that second temperature is poor according to the environment temperature redefined and the basal temperature.
S407: if the second temperature difference is higher than the basal temperature difference threshold value, determine that the temperature sensor is insincere.
S408: if the second temperature difference is not higher than the basal temperature difference threshold value, determine that the temperature sensor is credible.
After redefining environment temperature, which is accurate environment temperature, therefore, can be according to redefining Environment temperature and basal temperature, to determine that second temperature is poor.If second temperature difference is higher than basal temperature difference threshold value, can It is insincere with temperature sensor;If second temperature difference is not higher than basal temperature difference threshold value, can be sensed with temperature Device is credible.
As it can be seen that the inspection credibility detection of temperature sensor also may be implemented in the above method.
Next, practical application scene will be combined to the credible detection side of temperature sensor provided by the embodiments of the present application Method is introduced.Referring to Fig. 5, the figure shows the credible detection sides of another temperature sensor provided by the embodiments of the present application The flow chart of method.
It, can (or pump heats according to urea pump firstly, when vehicle ECU is powered on and urea pump is in non-heated mode Device) temperature sensor detection basal temperature and environment temperature, determine the first temperature difference, and by itself and basal temperature difference threshold Value is compared, however, it is determined that the first temperature difference is higher than basal temperature difference threshold value, can determine whether environment temperature is accurate, if quasi- Really, then it can determine that the temperature sensor is insincere, if the environment temperature is inaccurate, environment temperature can be carried out more Newly, and abovementioned steps are re-started.
If it is determined that the first temperature difference is not higher than basal temperature difference threshold value, and current urea pump is in heating mode, then can be with Carry out dynamic detection.Wherein it is possible to temperature sensor the first observed temperature detected when recording moment t1, and at it Maximum observed temperature in heating process afterwardsWith the first observed temperatureTemperature gap (observed temperature is poor), and determination is No arrival time t2, if so, it is poor to be directed to current observed temperature, determines that it is if it is not, continuing to determine that observed temperature is poor in real time It is no to determine that the temperature sensor is credible if being more than more than theoretical temperature value, if not exceeded, determining that the temperature passes Sensor is insincere.
Based on the creditability detection method of temperature sensor above-mentioned, this application provides a kind of the credible of temperature sensor Property detection device.Referring to Fig. 6, the figure shows a kind of credible detection devices of temperature sensor provided by the embodiments of the present application Structure chart, the temperature sensor are the temperature sensor of urea pump or the temperature sensor for pumping heater, wherein the pump Heater is used to heat the urea pump, and described device includes:
First acquisition unit 601 obtains the actual measurement of the temperature sensor if being in heating mode for the urea pump Temperature difference, the observed temperature difference be the temperature sensor detected under physical condition from moment t1 to the temperature of moment t2 Difference;
Second acquisition unit 602, poor for obtaining the corresponding theoretical temperatures of the observed temperature difference, the theoretical temperatures are poor For calculated normal temperature sensor with the physical condition should detect under the same conditions from the moment t1 to The difference of the temperature of the moment t2;
First determination unit 603, for the relationship according to the observed temperature difference and the theoretical temperatures difference, determine described in Whether temperature sensor is credible.
Optionally, the observed temperature difference be the first observed temperature detect in the moment t1 and the moment t1 extremely The difference of the maximum observed temperature detected in the moment t2;The theoretical temperatures difference is the normal temperature sensor described The first theoretical temperatures that moment t1 should be detected and the difference in the moment t2 the second theoretical temperatures that should be detected.
Optionally, the physical condition includes ambient temperature conditions.
Optionally, the first acquisition unit 601, also particularly useful for:
The time of the moment t1 to the moment t2 be preset fixed duration, if the moment t1 to it is described when The heating mode for carving the urea pump in the time of t2 is interrupted, and in the heating mode for interrupting the urea pump after a certain period of time It is restarted;
If the time interrupted is less than break period threshold value, and interrupts temperature difference and is less than interruption temperature difference threshold value, then, described Observed temperature difference is to determine before being interrupted according to the heating mode with the temperature for being restarted the rear temperature sensor detection, Wherein, the interruption temperature difference be the temperature sensor when the heating mode is interrupted with detected respectively when being restarted Temperature difference.
Optionally, the first acquisition unit 601, also particularly useful for:
If the time of the interruption is not less than the break period threshold value or the interruption temperature difference not less than described Temperature difference threshold value is interrupted, the observed temperature difference is that the temperature of the rear temperature sensor detection is restarted according to the heating mode Degree determination.
Optionally, described device further includes the second determination unit, and second determination unit is used for:
If the urea pump is in non-heated mode, and vehicle starts to start, and determines the base of the temperature sensor detection First temperature difference of plinth temperature and environment temperature;
If first temperature difference is not higher than basal temperature difference threshold value, determine that the temperature sensor is credible;
If first temperature difference is higher than the basal temperature difference threshold value, according to the mild selective catalytic oxidation of engine water The upstream temperature of SCR system determines whether the environment temperature is accurate;
If it is determined that the environment temperature is accurate, determine that the temperature sensor is insincere;
If it is determined that environment temperature inaccuracy, according to the mild selective catalytic oxidation SCR system of the engine water The upstream temperature of system redefines the environment temperature;
Determine that second temperature is poor according to the environment temperature redefined and the basal temperature;
If the second temperature difference is higher than the basal temperature difference threshold value, determine that the temperature sensor is insincere;
If the second temperature difference is not higher than the basal temperature difference threshold value, determine that the temperature sensor is credible.
Optionally, first determination unit 603, is specifically used for:
It is poor to determine whether the observed temperature difference is lower than theoretical temperatures;
If so, determining that the temperature sensor is insincere;
If it is not, determining that the temperature sensor is credible.
The creditability detection method of temperature sensor provided by the present application, therein it can be seen from above-mentioned technical proposal Temperature sensor can be the temperature sensor of urea pump or pump the temperature sensor of heater.The pump heater can be used It is heated in the urea pump.The creditability detection method includes: the i.e. pump heating when urea pump is in heating mode When device heats urea pump, the observed temperature of available temperature sensor is poor, wherein the observed temperature difference can be this The difference of the temperature of t1 to moment t2 at the time of temperature sensor detects under physical condition.After obtaining observed temperature difference, It is poor that the corresponding theoretical temperatures of observed temperature difference can also be obtained, which can be calculated normal temperature sensing The difference of the temperature of t1 to moment t2 at the time of device should detect under the physical condition.Since the theoretical temperatures difference is corresponding It is calculated when the temperature sensor is normal temperature sensor (i.e. the temperature sensor is credible), it therefore, can be according to reality The relationship of testing temperature difference and theoretical temperatures difference determines whether the temperature sensor is credible.To can determine that the temperature of urea pump It spends sensor and pumps the credibility of the temperature sensor of heater.
As seen through the above description of the embodiments, those skilled in the art can be understood that above-mentioned implementation All or part of the steps in example method can be realized by means of software and necessary general hardware platform.Based on such Understand, substantially the part that contributes to existing technology can be in the form of software products in other words for the technical solution of the application It embodies, which can store in storage medium, such as ROM/RAM, magnetic disk, CD, including several Instruction is used so that a computer equipment (can be the network communications such as personal computer, server, or Media Gateway Equipment, etc.) execute method described in certain parts of each embodiment of the application or embodiment.
It should be noted that each embodiment in this specification is described in a progressive manner, each embodiment emphasis is said Bright is the difference from other embodiments, and the same or similar parts in each embodiment may refer to each other.For reality For applying device disclosed in example, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place Referring to method part illustration.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain Lid non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that There is also other identical elements in process, method, article or equipment including the element.
The foregoing description of the disclosed embodiments makes professional and technical personnel in the field can be realized or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the application.Therefore, the application It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one The widest scope of cause.

Claims (12)

1. a kind of creditability detection method of temperature sensor, which is characterized in that the temperature sensor is the temperature of urea pump Sensor or the temperature sensor for pumping heater, wherein the pump heater is used to heat the urea pump, the method Include:
If the urea pump is in heating mode, the observed temperature for obtaining the temperature sensor is poor, and the observed temperature difference is The temperature sensor detected under physical condition from moment t1 to the difference of the temperature of moment t2;
Obtain that the corresponding theoretical temperatures of observed temperature difference are poor, and the theoretical temperatures difference is calculated normal temperature sensor With the physical condition should detect under the same conditions from the moment t1 to the difference of the temperature of the moment t2;
According to the relationship of the observed temperature difference and the theoretical temperatures difference, determine whether the temperature sensor is credible;
The time of the moment t1 to the moment t2 is preset fixed duration, if in the moment t1 to the moment t2 Time in the heating mode of the urea pump be interrupted, and weighed in the heating mode for interrupting the urea pump after a certain period of time It opens;
Then, the observed temperature for obtaining the temperature sensor is poor, comprising:
If the time interrupted is less than break period threshold value, and interrupts temperature difference and be less than interruption temperature difference threshold value, the actual measurement temperature Degree difference is to determine before being interrupted according to the heating mode with the temperature for being restarted the rear temperature sensor detection, wherein The temperature difference of interrupting is the temperature that the temperature sensor detects respectively when the heating mode is interrupted and when being restarted The difference of degree.
2. the method according to claim 1, wherein the observed temperature difference is the detected in the moment t1 One observed temperature with from the moment t1 to the difference of the moment t2 maximum observed temperature detected;The theoretical temperatures difference is The first theoretical temperatures that the normal temperature sensor should be detected in the moment t1 with should detect in the moment t2 The difference of second theoretical temperatures.
3. the method according to claim 1, wherein the physical condition includes ambient temperature conditions.
4. the method according to claim 1, wherein the observed temperature for obtaining the temperature sensor is poor, Further include:
If the time of the interruption is not less than the interruption not less than the break period threshold value or the interruption temperature difference Temperature difference threshold value, the observed temperature difference be restarted according to the heating mode rear temperature sensor detection temperature it is true Fixed.
5. the method according to claim 1, wherein if the urea pump is in non-heated mode, and vehicle is opened Begin to start, the method also includes:
Determine the basal temperature of the temperature sensor detection and the first temperature difference of environment temperature;
If first temperature difference is not higher than basal temperature difference threshold value, determine that the temperature sensor is credible;
If first temperature difference is higher than the basal temperature difference threshold value, according to the mild selective catalytic oxidation SCR of engine water The upstream temperature of system determines whether the environment temperature is accurate;
If it is determined that the environment temperature is accurate, determine that the temperature sensor is insincere;
If it is determined that environment temperature inaccuracy, according to the mild selective catalytic oxidation SCR system of the engine water Upstream temperature redefines the environment temperature;
Determine that second temperature is poor according to the environment temperature redefined and the basal temperature;
If the second temperature difference is higher than the basal temperature difference threshold value, determine that the temperature sensor is insincere;
If the second temperature difference is not higher than the basal temperature difference threshold value, determine that the temperature sensor is credible.
6. method described in -5 any one according to claim 1, which is characterized in that described according to the observed temperature difference and institute The relationship for stating theoretical temperatures difference determines whether the temperature sensor is credible, comprising:
It is poor to determine whether the observed temperature difference is lower than theoretical temperatures;
If so, determining that the temperature sensor is insincere;
If it is not, determining that the temperature sensor is credible.
7. a kind of credible detection device of temperature sensor, which is characterized in that the temperature sensor is the temperature of urea pump Sensor or the temperature sensor for pumping heater, wherein the pump heater is used to heat the urea pump, described device Include:
First acquisition unit, if being in heating mode for the urea pump, the observed temperature for obtaining the temperature sensor is poor, The observed temperature difference be the temperature sensor detected under physical condition from moment t1 to the difference of the temperature of moment t2;
Second acquisition unit, poor for obtaining the corresponding theoretical temperatures of the observed temperature difference, the theoretical temperatures difference is to calculate Normal temperature sensor out with the physical condition should detect under the same conditions from the moment t1 to it is described when Carve the difference of the temperature of t2;
First determination unit determines that the temperature passes for the relationship according to the observed temperature difference and the theoretical temperatures difference Whether sensor is credible;
The first acquisition unit, also particularly useful for:
The time of the moment t1 to the moment t2 is preset fixed duration, if in the moment t1 to the moment t2 Time in the heating mode of the urea pump be interrupted, and weighed in the heating mode for interrupting the urea pump after a certain period of time It opens;
If the time interrupted is less than break period threshold value, and interrupts temperature difference and be less than interruption temperature difference threshold value, then, the actual measurement Temperature difference is to determine before being interrupted according to the heating mode with the temperature for being restarted the rear temperature sensor detection, In, the interruption temperature difference be the temperature sensor when the heating mode is interrupted with detected respectively when being restarted The difference of temperature.
8. device according to claim 7, which is characterized in that the observed temperature difference is the detected in the moment t1 One observed temperature with from the moment t1 to the difference of the moment t2 maximum observed temperature detected;The theoretical temperatures difference is The first theoretical temperatures that the normal temperature sensor should be detected in the moment t1 with should detect in the moment t2 The difference of second theoretical temperatures.
9. device according to claim 7, which is characterized in that the physical condition includes ambient temperature conditions.
10. device according to claim 7, which is characterized in that the first acquisition unit, also particularly useful for:
If the time of the interruption is not less than the interruption not less than the break period threshold value or the interruption temperature difference Temperature difference threshold value, the observed temperature difference be restarted according to the heating mode rear temperature sensor detection temperature it is true Fixed.
11. device according to claim 7, which is characterized in that described device further includes the second determination unit, and described second Determination unit is used for:
If the urea pump is in non-heated mode, and vehicle starts to start, and determines the basis temperature of the temperature sensor detection First temperature difference of degree and environment temperature;
If first temperature difference is not higher than basal temperature difference threshold value, determine that the temperature sensor is credible;
If first temperature difference is higher than the basal temperature difference threshold value, according to the mild selective catalytic oxidation SCR of engine water The upstream temperature of system determines whether the environment temperature is accurate;
If it is determined that the environment temperature is accurate, determine that the temperature sensor is insincere;
If it is determined that environment temperature inaccuracy, according to the mild selective catalytic oxidation SCR system of the engine water Upstream temperature redefines the environment temperature;
Determine that second temperature is poor according to the environment temperature redefined and the basal temperature;
If the second temperature difference is higher than the basal temperature difference threshold value, determine that the temperature sensor is insincere;
If the second temperature difference is not higher than the basal temperature difference threshold value, determine that the temperature sensor is credible.
12. according to device described in claim 7-11 any one, which is characterized in that first determination unit is specific to use In:
It is poor to determine whether the observed temperature difference is lower than theoretical temperatures;
If so, determining that the temperature sensor is insincere;
If it is not, determining that the temperature sensor is credible.
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