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

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

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CN105628257B
CN105628257B CN201510963671.2A CN201510963671A CN105628257B CN 105628257 B CN105628257 B CN 105628257B CN 201510963671 A CN201510963671 A CN 201510963671A CN 105628257 B CN105628257 B CN 105628257B
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value
temperature sensor
exhaust gas
gas temperature
period
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CN105628257A (en
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王军
刘旭海
王奉双
王胜
王孝莉
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Weichai Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K15/00—Testing or calibrating of thermometers
    • G01K15/007—Testing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
    • G01K13/024—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow of moving gases
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K2205/00—Application of thermometers in motors, e.g. of a vehicle
    • G01K2205/04—Application of thermometers in motors, e.g. of a vehicle for measuring exhaust gas temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

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

Description

一种排气温度传感器失效的检测方法和装置Method and device for detecting failure of exhaust gas temperature sensor

技术领域technical field

本发明涉及汽车自动检测领域，具体涉及一种排气温度传感器失效的检测方法和装置。The invention relates to the field of automatic detection of automobiles, in particular to a method and device for detecting failure of an exhaust gas temperature sensor.

背景技术Background technique

SCR(Selective Catalytic Reduction，选择性催化还原技术)技术是消除柴油机排气中氮氧化物的主要后处理技术之一。根据功能主要分为控制单元、尿素剂量单元和催化反应单元三部分。SCR系统的控制单元与发动机的电子控制单元(ECU，ElectronicControl Unit)集成在一起，主要用来执行SCR控制策略，并根据环境温度、排气温度、尿素液位、尿素温度、尿素压力、氮氧化物浓度等传感器信号控制尿素剂量单元，根据需求定时定量地将尿素溶液喷射到柴油机排气气流中；尿素剂量单元主要包括尿素箱、尿素供给单元、尿素喷射单元、加热组件及连接管路和线路，用于保证尿素溶液的充分雾化和分解；催化反应单元主要包括SCR催化剂及其封装，用来将柴油机排气中的主要有害成分氮氧化物还原为氮气和水。SCR (Selective Catalytic Reduction, selective catalytic reduction technology) technology is one of the main post-treatment technologies for eliminating nitrogen oxides in diesel engine exhaust. According to the function, it is mainly divided into three parts: control unit, urea dosage unit and catalytic reaction unit. The control unit of the SCR system is integrated with the electronic control unit (ECU, Electronic Control Unit) of the engine. The urea dosing unit is controlled by sensor signals such as the concentration of pollutants, and the urea solution is regularly and quantitatively injected into the exhaust gas flow of the diesel engine according to the demand; the urea dosing unit mainly includes a urea tank, a urea supply unit, a urea injection unit, a heating component, and connecting pipes and lines , used to ensure sufficient atomization and decomposition of urea solution; the catalytic reaction unit mainly includes SCR catalyst and its package, which is used to reduce the main harmful components of nitrogen oxides in diesel engine exhaust to nitrogen and water.

SCR系统基本工作原理：废气从增压器涡轮流出后进入排气管中，同时由安装在排气管上的尿素喷射单元将定量的尿素水溶液以雾状形态喷入排气管中，尿素液和高温废气发生水解和热解反应，生成所需要的还原剂氨气(NH3)，氨气(NH3)在催化剂的作用下将氮氧化物有选择性地还原为氮气(N2)。The basic working principle of the SCR system: the exhaust gas flows out from the turbocharger turbine and enters the exhaust pipe, and at the same time, the urea injection unit installed on the exhaust pipe sprays a certain amount of urea aqueous solution into the exhaust pipe in the form of mist, and the urea solution Hydrolysis and pyrolysis reactions occur with high-temperature exhaust gas to generate the required reducing agent ammonia (NH 3 ), and the ammonia (NH 3 ) selectively reduces nitrogen oxides to nitrogen (N 2 ) under the action of the catalyst.

其中，排气温度温传感器设置在排气管中，用于将排气管中的温度信号转换为电信号后发送给SCR的控制单元，SCR的控制单元根据排气温度传感器及其他传感器发送的电信号，控制尿素剂量单元喷射一定量的尿素液到排气管中，以使尿素液与排气管中的废气发生反应。如果排气温度传感器由于各种原因导致测量值出现偏差，就会影响排气管中尿素液的喷射量，如果排气管中的尿素液喷射过少，就可能会导致车辆运行过程中尾气排放超标，如果排气管中的尿素液喷射过多，就可能会导致排气管中多余的尿素液结晶。Among them, the exhaust temperature sensor is installed in the exhaust pipe, which is used to convert the temperature signal in the exhaust pipe into an electrical signal and send it to the SCR control unit. The electrical signal controls the urea dosage unit to inject a certain amount of urea solution into the exhaust pipe, so that the urea solution reacts with the exhaust gas in the exhaust pipe. If the measured value of the exhaust gas temperature sensor deviates due to various reasons, it will affect the injection amount of urea solution in the exhaust pipe. If the urea solution in the exhaust pipe is injected too little, it may cause exhaust emissions during vehicle operation. Exceeding the standard, if the urea solution in the exhaust pipe is injected too much, it may cause the excess urea solution in the exhaust pipe to crystallize.

现有技术中通过静态检测和动态检测判断SCR排气温度传感器工作状态是否正常。静态检测思路为：在发动机冷启动时，比较排气温度传感器和环境温度传感器测量值，如果两者差值大于预设阈值，则判断排气温度传感器不可信。动态检测思路为：1)在运行过程中判断排气温度传感器测量值是否低于理论下限值的偏差范围：当理论模型计算的温度低于传感器可信性判断的下限Tlo_C，且持续时间超过预设时间后传感器的测量值也不在该下限值的一个偏差范围(Tlo_C-Tlomin，Thi_C+Tlomax)内，则判定传感器的检测值失效。2)在运行过程中判断排气温度传感器测量值是否超过理论上限值的偏差范围：当理论模型计算的温度低于传感器可信性判断的上限Thi_C，且持续时间超过预设时间后传感器的测量值也不在该上限值的一个偏差范围(Thi_C-Thimin，Thi_C+Thimax)内，则判定传感器的检测值失效。In the prior art, static detection and dynamic detection are used to determine whether the working state of the SCR exhaust gas temperature sensor is normal. The idea of static detection is: when the engine is cold started, compare the measured values of the exhaust temperature sensor and the ambient temperature sensor, and if the difference between the two is greater than the preset threshold, it is judged that the exhaust temperature sensor is not reliable. The idea of dynamic detection is as follows: 1) During operation, it is judged whether the measured value of the exhaust gas temperature sensor is lower than the theoretical lower limit. If the measured value of the sensor is not within a deviation range (Tlo_C-Tlo min , Thi_C+Tlo max ) of the lower limit after the preset time, it is determined that the detected value of the sensor is invalid. 2) During operation, judge whether the measured value of the exhaust gas temperature sensor exceeds the deviation range of the theoretical upper limit: when the temperature calculated by the theoretical model is lower than the upper limit Thi_C of the sensor reliability judgment, and the duration exceeds the preset time, the sensor’s If the measured value is not within a deviation range (Thi_C-Thi min , Thi_C+Thi max ) of the upper limit, it is determined that the detection value of the sensor is invalid.

现有的排气温度传感器失效的检测方法的缺陷是：只能判断排气温度传感器的测量值是否不超过测量的上限或不低于测量的下限，而当测量值不超过测量的上限且不低于测量的下限时，测量值是否存在偏差，检测不出来。The defect of the existing exhaust gas temperature sensor failure detection method is: it can only be judged whether the measured value of the exhaust gas temperature sensor does not exceed the upper limit of the measurement or is not lower than the lower limit of the measurement, and when the measured value does not exceed the upper limit of the measurement and is not When it is lower than the lower limit of measurement, whether there is a deviation in the measured value cannot be detected.

发明内容Contents of the invention

本发明的一个目的在于解决上述技术问题。One object of the present invention is to solve the above-mentioned technical problems.

针对上述问题，本发明提出了一种排气温度传感器失效的检测方法，包括：In view of the above problems, the present invention proposes a detection method for the failure of the exhaust gas temperature sensor, including:

建立不同的发动机转速和喷油量与排气温度传感器的标定值之间的对应关系；还包括：当发动机启动后，针对连续的多个第一预设长度的时间段中的每一个时间段，执行步骤S1-步骤S3：Establishing the corresponding relationship between different engine speeds and fuel injection quantities and the calibration value of the exhaust gas temperature sensor; it also includes: after the engine is started, for each of the multiple consecutive time periods of the first preset length , execute step S1-step S3:

步骤S1、根据发动机转速和喷油量与时间的对应关系及所述不同的发动机转速和喷油量与排气温度传感器的标定值之间的对应关系确定第一平均值，所述第一平均值为该时间段内的标定值的平均值；Step S1. Determine the first average value according to the corresponding relationship between the engine speed and fuel injection quantity and time and the corresponding relationship between the different engine speed and fuel injection quantity and the calibration value of the exhaust gas temperature sensor. The first average value The value is the average value of the calibration values in this time period;

步骤S2、计算第二平均值，所述第二平均值为该时间段内的排气温度传感器测量值的平均值；Step S2, calculating a second average value, the second average value being the average value of the measured values of the exhaust gas temperature sensor within this time period;

步骤S3、判断第一平均值和第二平均值的差值的绝对值是否大于预设阈值；Step S3, judging whether the absolute value of the difference between the first average value and the second average value is greater than a preset threshold;

在大于预设阈值的时间段的个数大于预设个数时，判定所述排气温度传感器失效。When the number of time periods greater than the preset threshold is greater than the preset number, it is determined that the exhaust gas temperature sensor is invalid.

优选地，所述方法还包括：Preferably, the method also includes:

当判定所述排气温度传感器失效后，发出警报。When it is determined that the exhaust gas temperature sensor fails, an alarm is issued.

优选地，所述方法还包括：Preferably, the method also includes:

当判定所述排气温度传感器失效后，将当前时刻的发动机转速和喷油量所对应的排气温度传感器的标定值作为当前时刻排气温度传感器的测量值输出。When it is determined that the exhaust gas temperature sensor is invalid, output the calibration value of the exhaust gas temperature sensor corresponding to the engine speed and fuel injection quantity at the current moment as the measured value of the exhaust gas temperature sensor at the current moment.

优选地，所述方法还包括：Preferably, the method also includes:

根据当前时刻的环境温度和环境压力，对所述标定值进行修正。The calibration value is corrected according to the ambient temperature and ambient pressure at the current moment.

优选地，所述步骤S1具体包括：Preferably, the step S1 specifically includes:

对于达到预设条件的每个子时间段，根据发动机转速和喷油量与时间的对应关系及所述不同的发动机转速和喷油量与排气温度传感器的标定值之间的对应关系确定在该子时间段内标定值的积分值；For each sub-time period that reaches the preset condition, according to the corresponding relationship between the engine speed and fuel injection quantity and time and the corresponding relationship between the different engine speed and fuel injection quantity and the calibration value of the exhaust gas temperature sensor The integral value of the calibration value in the sub-time period;

将所确定的各个积分值的和与满足预设条件的各子时间段的长度的和的比值作为该时间段内标定值的平均值；The ratio of the sum of the determined integral values to the sum of the lengths of the sub-time periods satisfying the preset conditions is taken as the average value of the calibration value in the time period;

所述步骤S2具体包括：Described step S2 specifically comprises:

对于达到预设条件的每个子时间段，计算该子时间段内排气温度传感器测量值的积分值；For each sub-time period when the preset condition is reached, calculate the integral value of the measured value of the exhaust gas temperature sensor within the sub-time period;

将所确定的各个积分值的和与满足预设条件的各子时间段的长度的和的比值作为该时间段内标定值的平均值；The ratio of the sum of the determined integral values to the sum of the lengths of the sub-time periods satisfying the preset conditions is taken as the average value of the calibration value in the time period;

其中，所述预设条件为：发动机转速不小于预设转速，且发动机冷却水温不小于预设温度，且子时间段内所述排气温度传感器的测量值的变化幅度在预设区间内。Wherein, the preset condition is: the engine speed is not less than the preset speed, and the engine cooling water temperature is not less than the preset temperature, and the change range of the measured value of the exhaust gas temperature sensor within the sub-time period is within the preset interval.

一种排气温度传感器失效的检测装置，包括：A detection device for failure of an exhaust gas temperature sensor, comprising:

建立单元，用于当发动机启动后，建立不同的发动机转速和喷油量与排气温度传感器的标定值之间的对应关系；The establishment unit is used to establish the corresponding relationship between different engine speeds and fuel injection quantities and the calibration value of the exhaust temperature sensor after the engine is started;

确定单元，用于当发动机启动后，针对连续的多个第一预设长度的时间段中的每一个时间段，根据发动机转速和喷油量与时间的对应关系及所述不同的发动机转速和喷油量与排气温度传感器的标定值之间的对应关系确定第一平均值，所述第一平均值为在该时间段内的标定值的平均值；The determination unit is configured to, after the engine is started, for each of the multiple consecutive time periods of the first preset length, according to the corresponding relationship between the engine speed and the fuel injection quantity and time and the different engine speed and The corresponding relationship between the fuel injection quantity and the calibration value of the exhaust gas temperature sensor determines a first average value, and the first average value is the average value of the calibration values within this time period;

计算单元，用于当发动机启动后，针对连续的多个第一预设长度的时间段中的每一个时间段，计算第二平均值，所述第二平均值为该时间段内的排气温度传感器测量值的平均值；The calculation unit is used to calculate a second average value for each of the multiple continuous time periods of the first preset length after the engine is started, and the second average value is the exhaust gas in the time period Average value of temperature sensor measurements;

比较单元，用于当发动机启动后，针对连续的多个第一预设长度的时间段中的每一个时间段，判断第一平均值和第二平均值的差值的绝对值是否大于预设阈值；The comparison unit is used to determine whether the absolute value of the difference between the first average value and the second average value is greater than the preset value for each of the multiple consecutive time periods of the first preset length after the engine is started. threshold;

判断单元，用于当发动机启动后，在大于预设阈值的时间段的个数大于预设个数时，判定所述排气温度传感器失效。A judging unit, configured to judge that the exhaust gas temperature sensor is invalid when the number of time periods greater than a preset threshold is greater than a preset number after the engine is started.

优选地，所述装置还包括：Preferably, the device also includes:

报警单元，用于当判定所述排气温度传感器失效后，发出警报。The alarm unit is configured to issue an alarm when it is determined that the exhaust gas temperature sensor is invalid.

优选地，所述装置还包括：Preferably, the device also includes:

输出单元，用于当判定所述排气温度传感器失效后，将当前时刻的发动机转速和喷油量所对应的排气温度传感器的标定值作为当前时刻排气温度传感器的测量值输出。The output unit is configured to output the calibration value of the exhaust temperature sensor corresponding to the engine speed and fuel injection quantity at the current moment as the measured value of the exhaust temperature sensor at the current moment when it is determined that the exhaust gas temperature sensor is invalid.

优选地，所述装置还包括：Preferably, the device also includes:

修正单元，用于根据当前时刻的环境温度和环境压力，对所述标定值进行修正。The correction unit is used to correct the calibration value according to the current ambient temperature and ambient pressure.

优选地，所述确定单元具体包括：Preferably, the determining unit specifically includes:

第一积分子单元，用于对于达到预设条件的每个子时间段，根据发动机转速和喷油量与时间的对应关系及所述不同的发动机转速和喷油量与排气温度传感器的标定值之间的对应关系确定在该子时间段内标定值的积分值；The first integral subunit is used for each sub-period when the preset condition is reached, according to the corresponding relationship between the engine speed and fuel injection quantity and time and the calibration value of the different engine speed, fuel injection quantity and exhaust temperature sensor The corresponding relationship between determines the integral value of the calibration value in the sub-time period;

第一平均值计算子单元，用于将所确定的各个积分值的和与满足预设条件的各子时间段的长度的和的比值作为该时间段内标定值的平均值；The first average value calculation subunit is used to use the ratio of the sum of the determined integral values to the sum of the lengths of each sub-time period satisfying the preset condition as the average value of the calibration value within the time period;

所述计算单元具体包括：The computing unit specifically includes:

第二积分子单元，用于对于达到预设条件的每个子时间段，计算该子时间段内排气温度传感器测量值的积分值；The second integration subunit is used for calculating the integral value of the measured value of the exhaust gas temperature sensor within the sub-time period for each sub-time period when the preset condition is reached;

第二平均值计算子单元，用于将所确定的各个积分值的和与满足预设条件的各子时间段的长度的和的比值作为该时间段内标定值的平均值；The second average value calculation subunit is used to use the ratio of the sum of the determined integral values to the sum of the lengths of each sub-time period satisfying the preset condition as the average value of the calibration value within the time period;

其中，所述预设条件为：发动机转速不小于预设转速，且发动机冷却水温不小于预设温度，且子时间段内所述排气温度传感器的测量值的变化幅度在预设区间内。Wherein, the preset condition is: the engine speed is not less than the preset speed, and the engine cooling water temperature is not less than the preset temperature, and the change range of the measured value of the exhaust gas temperature sensor within the sub-time period is within the preset interval.

本发明提供的一种排气温度传感器失效的检测方法，判断连续的多个第一预设长度的时间段中的每一时间段内的排气温度传感器测量值的平均值与标定值的平均值之间的差值的绝对值是否大于预设阈值，当大于预设阈值的时间段的个数大于预设个数时，判定所述排气温度传感器失效，本发明提供的技术方案能实现排气温度传感器整个工作过程中的测量值误差检测，相比现有技术，能判断出当排气温度传感器测量值没有超出测量的上限和下限时，测量值是否存在偏差。The present invention provides a method for detecting failure of an exhaust gas temperature sensor, judging the average value of the measured value of the exhaust gas temperature sensor and the average value of the calibration value in each of a plurality of consecutive time periods of the first preset length Whether the absolute value of the difference between the values is greater than the preset threshold, when the number of time periods greater than the preset threshold is greater than the preset number, it is determined that the exhaust gas temperature sensor is invalid, and the technical solution provided by the present invention can realize Compared with the prior art, the error detection of the measured value of the exhaust gas temperature sensor during the entire working process can determine whether there is a deviation in the measured value when the measured value of the exhaust gas temperature sensor does not exceed the upper and lower limits of measurement.

附图说明Description of drawings

图1为本发明一实施例提供的一种排气温度传感器失效的检测方法流程示意图；Fig. 1 is a schematic flowchart of a method for detecting failure of an exhaust gas temperature sensor provided by an embodiment of the present invention;

图2为本发明另一实施例提供的一种排气温度传感器失效的检测方法流程示意图；Fig. 2 is a schematic flowchart of a method for detecting failure of an exhaust gas temperature sensor according to another embodiment of the present invention;

图3为本发明另一实施例提供的一种排气温度传感器失效的检测装置示意框图。Fig. 3 is a schematic block diagram of a detection device for exhaust gas temperature sensor failure provided by another embodiment of the present invention.

具体实施方式Detailed ways

为了能够更清楚地理解本发明的上述目的、特征和优点，下面结合附图和具体实施方式对本发明进行进一步的详细描述。需要说明的是，在不冲突的情况下，本申请的实施例及实施例中的特征可以相互组合。In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

在下面的描述中阐述了很多具体细节以便于充分理解本发明，但是，本发明还可以采用其他不同于在此描述的其他方式来实施，因此，本发明的保护范围并不受下面公开的具体实施例的限制。In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited by the specific details disclosed below. EXAMPLE LIMITATIONS.

图1为本发明一实施例提供的一种排气温度传感器失效的检测方法流程示意图。参见图1，该方法包括：Fig. 1 is a schematic flowchart of a method for detecting failure of an exhaust gas temperature sensor provided by an embodiment of the present invention. Referring to Figure 1, the method includes:

步骤S0、建立不同的发动机转速和喷油量与排气温度传感器的标定值之间的对应关系；还包括：当发动机启动后，针对连续的多个第一预设长度的时间段中的每一个时间段，执行步骤S1-步骤S3：Step S0, establishing the corresponding relationship between different engine speeds, fuel injection quantities and calibration values of the exhaust gas temperature sensor; A period of time, execute step S1-step S3:

步骤S1、根据发动机转速和喷油量与时间的对应关系及所述不同的发动机转速和喷油量与排气温度传感器的标定值之间的对应关系确定第一平均值，所述第一平均值为该时间段内的标定值的平均值；Step S1. Determine the first average value according to the corresponding relationship between the engine speed and fuel injection quantity and time and the corresponding relationship between the different engine speed and fuel injection quantity and the calibration value of the exhaust gas temperature sensor. The first average value The value is the average value of the calibration values in this time period;

步骤S2、计算第二平均值，所述第二平均值为该时间段内的排气温度传感器测量值的平均值；Step S2, calculating a second average value, the second average value being the average value of the measured values of the exhaust gas temperature sensor within this time period;

步骤S3、判断第一平均值和第二平均值的差值的绝对值是否大于预设阈值；Step S3, judging whether the absolute value of the difference between the first average value and the second average value is greater than a preset threshold;

步骤S4、在大于预设阈值的时间段的个数大于预设个数时，判定所述排气温度传感器失效。Step S4. When the number of time periods greater than the preset threshold is greater than the preset number, it is determined that the exhaust gas temperature sensor is invalid.

需要说明的是，上述步骤S1～S4是在一个驾驶循环(从发动机启动到紧邻的一次发动机停止)内进行的，当进入下一个驾驶循环，即发动机再次启动时，重新执行上述步骤S1～S4，直至发动机再次停止运行。It should be noted that the above-mentioned steps S1-S4 are performed within one driving cycle (from engine start to the next engine stop), and when entering the next driving cycle, that is, when the engine is started again, the above-mentioned steps S1-S4 are re-executed until the engine stops running again.

由上述技术方案可知，本发明提供的一种排气温度传感器失效的检测方法，判断连续的多个第一预设长度的时间段中的每一时间段内的排气温度传感器测量值的平均值与标定值的平均值之间的差值的绝对值是否大于预设阈值，当大于预设阈值的时间段的个数大于预设个数时，判定所述排气温度传感器失效，本发明提供的技术方案能实现排气温度传感器整个工作过程中的测量值误差检测，相比现有技术，能判断出当排气温度传感器测量值没有超出测量的上限和下限时，测量值是否存在偏差。It can be known from the above technical solution that the present invention provides a method for detecting the failure of the exhaust gas temperature sensor, which judges the average value of the measured values of the exhaust gas temperature sensor in each of the multiple consecutive time periods of the first preset length. Whether the absolute value of the difference between the value and the average value of the calibration value is greater than a preset threshold, and when the number of time periods greater than the preset threshold is greater than the preset number, it is determined that the exhaust gas temperature sensor is invalid. The present invention The technical solution provided can realize the error detection of the measured value of the exhaust gas temperature sensor during the entire working process. Compared with the existing technology, it can be judged whether there is a deviation in the measured value when the measured value of the exhaust gas temperature sensor does not exceed the upper and lower limits of the measurement. .

为了便于理解，对上述步骤S0～S4的具体实施方式举例如下(需要说明的是以下举例只是上述技术方案的一种实施方式，并不是对上述技术方案实施方式的限定)：For ease of understanding, the specific implementation manners of the above-mentioned steps S0 to S4 are given as follows (it should be noted that the following example is only an implementation manner of the above-mentioned technical solution, and is not a limitation to the implementation of the above-mentioned technical solution):

例如：第一预设长度的时间段为10分钟，预设阈值为5，预设个数为3个，当前时刻为7:10，上述方案的具体实施方式为：先通过台架试验建立不同的发动机转速和喷油量与排气温度传感器的标定值之间的对应关系，存储在存储器中，然后进行以下步骤：For example: the time period of the first preset length is 10 minutes, the preset threshold is 5, the preset number is 3, and the current moment is 7:10. The corresponding relationship between the engine speed and fuel injection quantity and the calibration value of the exhaust gas temperature sensor is stored in the memory, and then the following steps are performed:

1)根据7:00-7:10内发动机转速和喷油量与时间的对应关系，及预先存储的不同的发动机转速和喷油量与排气温度传感器标定值之间的对应关系，建立排气温度传感器标定值关于时间的函数，并计算出此函数值在7:00-7:10内的平均值为30；1) According to the corresponding relationship between engine speed, fuel injection quantity and time during 7:00-7:10, and the corresponding relationship between different pre-stored engine speed, fuel injection quantity and calibration value of exhaust gas temperature sensor, the exhaust gas temperature sensor is established. The function of the air temperature sensor calibration value with respect to time, and calculate the average value of this function value in 7:00-7:10 to be 30;

2)建立7:00-7:10内排气温度传感器实际值关于时间的函数，并计算出此函数在7:00-7:10内的平均值为20；2) Establish a function of the actual value of the exhaust gas temperature sensor in 7:00-7:10 with respect to time, and calculate that the average value of this function in 7:00-7:10 is 20;

3)由于|30-20|＞5，计数一次。3) Since |30-20|>5, count once.

7:20时对时间段7:10-7:20再执行与上述步骤1)～3)类似操作，然后等到7:30时对时间段7:20-7:30再执行与上述步骤1)～3)类似操作……当累计次数达到3次时，判定排气温度传感器失效。At 7:20, perform operations similar to the above steps 1) to 3) for the time period 7:10-7:20, and then perform the above steps 1) for the time period 7:20-7:30 at 7:30 ~3) Similar operations... When the cumulative number of times reaches 3, it is determined that the exhaust gas temperature sensor is invalid.

在具体实施时，步骤S0中建立不同的发动机转速和喷油量与排气温度传感器的标定值之间的对应关系，可以根据历史经验值建立，也可以根据试验结果建立。During specific implementation, the corresponding relationship between different engine speeds and fuel injection quantities and the calibration value of the exhaust gas temperature sensor is established in step S0, which may be established based on historical experience values or test results.

例如：通过台架或整车试验建立不同的发动机转速和喷油量与排气温度传感器的标定值之间的对应关系：以发动机转速为横坐标，喷油量为横纵坐标，通过台架试验或整车试验标定不同发动机转速和喷油量所对应的排气温度。For example: establish the corresponding relationship between different engine speeds and fuel injection quantities and the calibration value of the exhaust gas temperature sensor through bench or vehicle tests: take the engine speed as the abscissa and the fuel injection quantity as the abscissa and ordinate, and use the test bench to The test or vehicle test calibrates the exhaust gas temperature corresponding to different engine speeds and fuel injection quantities.

具体实施时，在通过台架试验进行标定时，考虑到在一定的发动机转速和喷油量下，连接SCR(Selective Catalytic Reduction，选择性催化还原技术)装置的上游排气管路越长，排气温降会越大，为了保证标定数据的准确性，台架布置时上游排气管路长度尽量接近整车实际状态。During specific implementation, when calibration is carried out through bench tests, it is considered that under a certain engine speed and fuel injection volume, the longer the upstream exhaust pipeline connected to the SCR (Selective Catalytic Reduction, Selective Catalytic Reduction Technology) device, the more exhaust The greater the temperature drop will be, in order to ensure the accuracy of the calibration data, the length of the upstream exhaust pipe is as close as possible to the actual state of the vehicle when the bench is arranged.

不难理解的是，步骤S1中根据发动机转速和喷油量与时间的对应关系及所述不同的发动机转速和喷油量与排气温度传感器的标定值之间的对应关系确定在该时间段内标定值的平均值，需要先根据发动机转速和喷油量与时间的对应关系及所述不同的发动机转速和喷油量与排气温度传感器的标定值之间的对应关系建立排气温度传感器的标定值和时间的对应关系，即建立排气温度传感器的标定值关于时间的函数，然后求此函数值在第一预设长度的时间段内的平均值。It is not difficult to understand that in step S1, according to the corresponding relationship between the engine speed and fuel injection quantity and time and the corresponding relationship between the different engine speed and fuel injection quantity and the calibration value of the exhaust gas temperature sensor, it is determined that during this time period The average value of the internal calibration value needs to establish the exhaust temperature sensor according to the corresponding relationship between the engine speed and fuel injection quantity and time and the corresponding relationship between the different engine speed and fuel injection quantity and the calibration value of the exhaust temperature sensor. The corresponding relationship between the calibration value of the exhaust gas temperature sensor and time, that is, to establish the function of the calibration value of the exhaust gas temperature sensor with respect to time, and then calculate the average value of this function value in the first preset time period.

步骤S2中计算该时间段内排气温度传感器测量值的平均值为建立排气温度传感器的测量值关于时间的函数，然后求此函数值在第一预设长度的时间段内的平均值。Calculating the average value of the measured value of the exhaust gas temperature sensor in the time period in step S2 is to establish a function of the measured value of the exhaust gas temperature sensor with respect to time, and then calculate the average value of this function value in the first preset time period.

步骤S3中判断两个平均值的差值的绝对值是否大于预设阈值，所述预设阈值可以根据排气温度传感器的类型、灵敏度及外部环境的温度、压力进行设置。In step S3, it is judged whether the absolute value of the difference between the two average values is greater than a preset threshold, which can be set according to the type and sensitivity of the exhaust gas temperature sensor and the temperature and pressure of the external environment.

步骤S4中在大于预设阈值的时间段的个数大于预设个数时，判定所述排气温度传感器失效，所述预设阈值和预设个数可以根据实际需要进行设置。In step S4, when the number of time periods greater than the preset threshold is greater than the preset number, it is determined that the exhaust gas temperature sensor is invalid, and the preset threshold and preset number can be set according to actual needs.

如图2所示，优选地，所述方法还包括：As shown in Figure 2, preferably, the method also includes:

步骤S5、当判定所述排气温度传感器失效后，发出警报。Step S5, when it is determined that the exhaust gas temperature sensor is invalid, an alarm is issued.

可以理解的是，当排气温度传感器失效后，发出警报可以及时提醒驾驶员进行故障检查，以避免出现排气温度传感器失效后影响排气管中尿素液的喷射量，从而导致的车辆运行过程中尾气排放超标，或由于排气管中的尿素液喷射过多而导致的排气管中多余的尿素液结晶。It is understandable that when the exhaust gas temperature sensor fails, an alarm can be issued to remind the driver to perform a fault check in time, so as to avoid the failure of the exhaust temperature sensor to affect the injection amount of urea solution in the exhaust pipe, which will cause the vehicle to run. Exceeding the standard exhaust gas emission, or excessive urea liquid crystallization in the exhaust pipe caused by excessive injection of urea liquid in the exhaust pipe.

优选地，所述方法还包括：Preferably, the method also includes:

步骤S6、当判定所述排气温度传感器失效后，将当前时刻的发动机转速和喷油量所对应的排气温度传感器的标定值作为当前时刻排气温度传感器的测量值输出。Step S6, when it is determined that the exhaust gas temperature sensor is invalid, output the calibration value of the exhaust gas temperature sensor corresponding to the engine speed and fuel injection quantity at the current moment as the measured value of the exhaust gas temperature sensor at the current moment.

可以理解的是，当判定所述排气温度传感器失效后，获取当前时刻的发动机转速和喷油量所对应的排气温度传感器的标定值作为当前时刻排气温度传感器的测量值可以保证排气温度传感器失效后，SCR系统还能正常运转。It can be understood that when it is determined that the exhaust gas temperature sensor is invalid, obtaining the calibration value of the exhaust temperature sensor corresponding to the engine speed and fuel injection quantity at the current moment can be used as the measured value of the exhaust temperature sensor at the current moment to ensure that the exhaust gas After the temperature sensor fails, the SCR system can still operate normally.

优选地，所述方法还包括：Preferably, the method also includes:

步骤S7、根据当前时刻的环境温度和环境压力，对所述标定值进行修正。Step S7, correcting the calibration value according to the current ambient temperature and ambient pressure.

可以理解的是，即使发动机转速和喷油量相同，在不同的环境温度和环境压力下，排气温度传感器的测量值也会发生变化，故根据当前时刻的环境温度和环境压力，对所述标定值进行修正，可以保证标定值更能真实地反映整车运行时排气温度传感器的工作情况，后续利用修正后的标定值去检测测量值是否有偏差，能提高判断传感器是否失效的准确度。It can be understood that even if the engine speed and fuel injection quantity are the same, the measured value of the exhaust gas temperature sensor will change under different ambient temperatures and ambient pressures. Therefore, according to the current ambient temperature and ambient pressure, the The correction of the calibration value can ensure that the calibration value can more truly reflect the working conditions of the exhaust temperature sensor when the vehicle is running, and then use the corrected calibration value to detect whether there is any deviation in the measurement value, which can improve the accuracy of judging whether the sensor is invalid .

优选地，所述步骤S1具体包括：Preferably, the step S1 specifically includes:

步骤S11、对于达到预设条件的每个子时间段，根据发动机转速和喷油量与时间的对应关系及所述不同的发动机转速和喷油量与排气温度传感器的标定值之间的对应关系确定在该子时间段内标定值的积分值；Step S11, for each sub-time period when the preset condition is reached, according to the corresponding relationship between the engine speed and fuel injection quantity and time and the corresponding relationship between the different engine speed and fuel injection quantity and the calibration value of the exhaust gas temperature sensor Determining the integral value of the calibration value within the sub-time period;

步骤S12、将所确定的各个积分值的和与满足预设条件的各子时间段的长度的和的比值作为该时间段内标定值的平均值；Step S12, taking the ratio of the sum of the determined integral values to the sum of the lengths of the sub-time periods satisfying the preset conditions as the average value of the calibration value within the time period;

所述步骤S2具体包括：Described step S2 specifically comprises:

步骤S21、对于达到预设条件的每个子时间段，计算该子时间段内排气温度传感器测量值的积分值；Step S21. For each sub-time period when the preset condition is met, calculate the integral value of the measured value of the exhaust gas temperature sensor within the sub-time period;

步骤S22、将所确定的各个积分值的和与满足预设条件的各子时间段的长度的和的比值作为该时间段内标定值的平均值；Step S22, taking the ratio of the sum of the determined integral values to the sum of the lengths of the sub-time periods satisfying the preset conditions as the average value of the calibration value within the time period;

其中，所述预设条件为：发动机转速不小于预设转速，且发动机冷却水温不小于预设温度，且子时间段内所述排气温度传感器的测量值的变化幅度在预设区间内。Wherein, the preset condition is: the engine speed is not less than the preset speed, and the engine cooling water temperature is not less than the preset temperature, and the change range of the measured value of the exhaust gas temperature sensor within the sub-time period is within the preset interval.

可选地，所述预设转速、预设温度、预设区间可以根据发动机类型、环境温度等实际情况进行设定。Optionally, the preset rotational speed, preset temperature, and preset range can be set according to actual conditions such as engine type and ambient temperature.

可以理解的是，发动机转速不小于预设转速，且发动机冷却水温不小于预设温度，且子时间段内所述排气温度传感器的测量值的变化幅度在预设区间内可以保证发动机已经开始稳定工作，此时排气管中排气温度在一个稳定的变化范围内，可以减少排气温度传感器的测量值由于外部干扰在短时间内剧烈变化而带来的传感器失效的误判定。It can be understood that the engine speed is not less than the preset speed, and the engine cooling water temperature is not less than the preset temperature, and the change range of the measured value of the exhaust gas temperature sensor within the sub-time period is within the preset range, which can ensure that the engine has started Stable operation, at this time, the exhaust temperature in the exhaust pipe is within a stable range of change, which can reduce the misjudgment of sensor failure caused by the rapid change of the measured value of the exhaust temperature sensor due to external interference in a short period of time.

可以理解的是，将第一预设长度的时间段分为若干个子时间段，对满足预设条件的子时间段，对标定值和测量值分别求积分，而对于不满足预设条件的子时间段，不对标定值和测量值求积分，可以使最终计算出的标定值的平均值和测量值的平均值之间的差值更能真实反映排气温度传感器在实际工作情况中的测量偏差，可以减少由于一些外部干扰带来的排气温度传感器失效的误判断。It can be understood that the time period of the first preset length is divided into several sub-time periods, and for the sub-time periods that meet the preset conditions, the calibration value and the measured value are respectively integrated, and for the sub-time periods that do not meet the preset conditions The time period, without integrating the calibration value and the measurement value, can make the difference between the average value of the final calculated calibration value and the average value of the measurement value more truly reflect the measurement deviation of the exhaust gas temperature sensor in actual working conditions , can reduce the misjudgment of the failure of the exhaust gas temperature sensor due to some external disturbances.

如图3所示，本发明还提出了一种排气温度传感器失效的检测装置100，包括：As shown in FIG. 3 , the present invention also proposes a detection device 100 for exhaust gas temperature sensor failure, including:

建立单元101，用于当发动机启动后，建立不同的发动机转速和喷油量与排气温度传感器的标定值之间的对应关系；The establishment unit 101 is used to establish the corresponding relationship between different engine speeds and fuel injection quantities and the calibration value of the exhaust gas temperature sensor after the engine is started;

确定单元102，用于当发动机启动后，针对连续的多个第一预设长度的时间段中的每一个时间段，根据发动机转速和喷油量与时间的对应关系及所述不同的发动机转速和喷油量与排气温度传感器的标定值之间的对应关系确定第一平均值，所述第一平均值为在该时间段内的标定值的平均值；The determination unit 102 is configured to, after the engine is started, for each of the multiple consecutive time periods of the first preset length, according to the corresponding relationship between the engine speed and the fuel injection quantity and time and the different engine speeds determining a first average value based on the corresponding relationship between the fuel injection quantity and the calibration value of the exhaust gas temperature sensor, and the first average value is the average value of the calibration values within the time period;

计算单元103，用于当发动机启动后，针对连续的多个第一预设长度的时间段中的每一个时间段，计算第二平均值，所述第二平均值为该时间段内的排气温度传感器测量值的平均值；The calculation unit 103 is configured to calculate a second average value for each of a plurality of continuous time periods of the first preset length after the engine is started, and the second average value is The average value of the measured values of the gas temperature sensor;

比较单元104，用于当发动机启动后，针对连续的多个第一预设长度的时间段中的每一个时间段，判断第一平均值和第二平均值的差值的绝对值是否大于预设阈值；The comparison unit 104 is used to determine whether the absolute value of the difference between the first average value and the second average value is greater than the preset value for each of the multiple consecutive time periods of the first preset length after the engine is started. set threshold;

判断单元105，用于当发动机启动后，在大于预设阈值的时间段的个数大于预设个数时，判定所述排气温度传感器失效。The judging unit 105 is configured to judge that the exhaust gas temperature sensor is invalid when the number of time periods greater than a preset threshold is greater than a preset number after the engine is started.

优选地，所示装置还包括：Preferably, the shown device also includes:

报警单元，用于当判定所述排气温度传感器失效后，发出警报。The alarm unit is configured to issue an alarm when it is determined that the exhaust gas temperature sensor is invalid.

优选地，所示装置还包括：Preferably, the shown device also includes:

输出单元，用于当判定所述排气温度传感器失效后，将当前时刻的发动机转速和喷油量所对应的排气温度传感器的标定值作为当前时刻排气温度传感器的测量值输出。The output unit is configured to output the calibration value of the exhaust temperature sensor corresponding to the engine speed and fuel injection quantity at the current moment as the measured value of the exhaust temperature sensor at the current moment when it is determined that the exhaust gas temperature sensor is invalid.

优选地，所述装置还包括：Preferably, the device also includes:

修正单元，用于根据当前时刻的环境温度和环境压力，对所述标定值进行修正。The correction unit is used to correct the calibration value according to the current ambient temperature and ambient pressure.

优选地，所述确定单元具体包括：Preferably, the determining unit specifically includes:

第一积分子单元，用于对于达到预设条件的每个子时间段，根据发动机转速和喷油量与时间的对应关系及所述不同的发动机转速和喷油量与排气温度传感器的标定值之间的对应关系确定在该子时间段内标定值的积分值；The first integral subunit is used for each sub-period when the preset condition is reached, according to the corresponding relationship between the engine speed and fuel injection quantity and time and the calibration value of the different engine speed, fuel injection quantity and exhaust temperature sensor The corresponding relationship between determines the integral value of the calibration value in the sub-time period;

第一平均值计算子单元，用于将所确定的各个积分值的和与满足预设条件的各子时间段的长度的和的比值作为该时间段内标定值的平均值；The first average value calculation subunit is used to use the ratio of the sum of the determined integral values to the sum of the lengths of each sub-time period satisfying the preset condition as the average value of the calibration value within the time period;

所述计算单元具体包括：The computing unit specifically includes:

第二积分子单元，用于对于达到预设条件的每个子时间段，计算该子时间段内排气温度传感器测量值的积分值；The second integration subunit is used for calculating the integral value of the measured value of the exhaust gas temperature sensor within the sub-time period for each sub-time period when the preset condition is reached;

第二平均值计算子单元，用于将所确定的各个积分值的和与满足预设条件的各子时间段的长度的和的比值作为该时间段内标定值的平均值；The second average value calculation subunit is used to use the ratio of the sum of the determined integral values to the sum of the lengths of each sub-time period satisfying the preset condition as the average value of the calibration value within the time period;

其中，所述预设条件为：发动机转速不小于预设转速，且发动机冷却水温不小于预设温度，且子时间段内所述排气温度传感器的测量值的变化幅度在预设区间内。Wherein, the preset condition is: the engine speed is not less than the preset speed, and the engine cooling water temperature is not less than the preset temperature, and the change range of the measured value of the exhaust gas temperature sensor within the sub-time period is within the preset interval.

综上，本发明提供的一种排气温度传感器失效的检测方法，判断连续的多个第一预设长度的时间段中的每一时间段内的排气温度传感器测量值的平均值与标定值的平均值之间的差值的绝对值是否大于预设阈值，当大于预设阈值的时间段的个数大于预设个数时，判定所述排气温度传感器失效，本发明提供的技术方案能实现排气温度传感器整个工作过程中的测量值误差检测，相比现有技术，能判断出当排气温度传感器测量值没有超出测量的上限和下限时，测量值是否存在偏差。To sum up, the present invention provides a method for detecting the failure of the exhaust gas temperature sensor, judging the average and calibration Whether the absolute value of the difference between the average values of the values is greater than a preset threshold, and when the number of time periods greater than the preset threshold is greater than the preset number, it is determined that the exhaust gas temperature sensor is invalid. The technology provided by the present invention The scheme can realize the error detection of the measured value of the exhaust temperature sensor during the entire working process. Compared with the prior art, it can be judged whether there is a deviation in the measured value when the measured value of the exhaust temperature sensor does not exceed the upper and lower limits of the measurement.

在本发明中，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性。术语“多个”指两个或两个以上，除非另有明确的限定。In the present invention, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance. The term "plurality" means two or more, unless otherwise clearly defined.

以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (8)

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