CN114812870A - A reliability determination method for a temperature sensor and related components - Google Patents

Abstract

The application discloses a reliability judging method of a temperature sensor and a related component, wherein in the scheme, temperature values acquired by N temperature sensors at an air inlet system end of an engine of a vehicle are acquired, and N is more than or equal to 3; respectively obtaining the absolute value of the difference value between the temperature value acquired by the ith temperature sensor and the temperature values acquired by the rest N-1 temperature sensors, wherein i is more than or equal to 1 and less than or equal to N; and if the number of the absolute values of the difference values larger than the preset value is not smaller than the preset number, judging that the ith temperature sensor is not credible. The temperature value acquired by one temperature sensor is compared with the temperature values acquired by the rest temperature sensors respectively to obtain the absolute values of N-1 difference values, and then whether the difference values are unreliable or not is judged through the process of judging the absolute values of the difference values for N-1 times, so that the probability of misjudgment is reduced.

Description

A reliability determination method for a temperature sensor and related components

technical field

The present invention relates to the technical field of determining the reliability of a temperature sensor, in particular to a method for determining the reliability of a temperature sensor and related components.

Background technique

At the intake system end of the engine of the vehicle, there are generally an ambient temperature sensor, an intake manifold temperature sensor, and EGR (Exhaust Gas Re-circulation, exhaust gas recirculation, which means that part of the exhaust gas discharged from the engine is returned to the intake manifold, and combined with The fresh mixture enters the cylinder again to participate in the combustion, which can effectively reduce the NOx value in the exhaust gas. NOx contains nitrogen dioxide and nitrogen monoxide, which are harmful gases produced in the combustion exhaust of diesel engines) downstream temperature sensors, air flowmeter temperature sensors, etc. If one of these temperature sensors is inaccurate or has a serious deviation, it will have a significant negative impact on the intake air volume control and EGR components of the engine, resulting in deterioration of combustion, excessive emissions, and pollution. In the prior art, the temperature value collected by each temperature sensor is separately monitored, and its reliability is judged. For example, the intake manifold temperature sensor collects the intake air temperature value, and the processor can determine the current intake air temperature value and the last time the engine was turned off. Whether the difference between the intake air temperature values of the engine is within the preset value range, if so, it is determined that the intake air temperature value collected by the intake manifold temperature sensor is normal, if not, it is determined that the intake manifold temperature sensor is not credible . It is too arbitrary to judge whether it is unreliable through a judgment process, and the probability of misjudgment is high.

SUMMARY OF THE INVENTION

The purpose of this application is to provide a method for determining the reliability of a temperature sensor and related components. In this solution, the temperature value collected by one temperature sensor is compared with the temperature values collected by the remaining temperature sensors, and N-1 temperature values are obtained. The absolute value of the difference is determined by N-1 times of judging the absolute value of the difference to determine whether it is unreliable, which reduces the probability of misjudgment.

In order to solve the above-mentioned technical problems, the present application provides a method for determining the reliability of a temperature sensor, including:

Obtain the temperature values collected by N temperature sensors at the intake system end of the engine of the vehicle, N≥3;

Obtain the absolute value of the difference between the temperature value collected by the i-th temperature sensor and the temperature values collected by the remaining N-1 temperature sensors, 1≤i≤N;

If the number of absolute values of the difference greater than the preset value is not less than the preset number, it is determined that the i-th temperature sensor is unreliable.

Preferably, the preset number is N-1.

Preferably, after determining that the i-th temperature sensor is unreliable, the method further includes:

Control the alarm module to alarm.

Preferably, after determining that the i-th temperature sensor is unreliable, the method further includes:

Sending a torque-limiting command to the engine places the engine in a low-power operating state.

Preferably, when N is 4, the N temperature sensors are respectively an ambient temperature sensor, an intake manifold temperature sensor, an EGR downstream temperature sensor and an air flow meter temperature sensor.

Preferably, the temperature values collected by N temperature sensors at the air intake system end of the engine of the vehicle are obtained, including:

Under a preset condition, the temperature values collected by N temperature sensors at the air intake system end of the engine of the vehicle are acquired, and the preset condition is that the engine is in a working state of cold start.

Preferably, the preset conditions further include that the intake air heater is not turned on and the self-check results of the N temperature sensors are normal.

In order to solve the above-mentioned technical problems, the present application also provides a reliability determination system for a temperature sensor, including:

A temperature acquisition unit, used to acquire the temperature values collected by N temperature sensors at the intake system end of the engine of the vehicle, N≥3;

The absolute value acquisition unit of the difference value is used to respectively acquire the absolute value of the difference between the temperature value collected by the i-th temperature sensor and the temperature values collected by the remaining N-1 temperature sensors, 1≤ i≤N;

An unreliable determination unit, configured to determine that the i-th temperature sensor is unreliable if the absolute value of the difference greater than the preset value is not less than the preset number.

In order to solve the above technical problems, the present application also provides a reliability determination device for a temperature sensor, including:

memory for storing computer programs;

The processor is configured to execute the computer program to implement the steps of the above-mentioned method for determining the reliability of the temperature sensor.

In order to solve the above technical problems, the present application also provides an air intake system of an engine, including N temperature sensors arranged at the end of the air intake system of the engine, and also includes the reliability determination device of the temperature sensor, N≥3 .

The present application provides a method for determining the reliability of a temperature sensor and related components. In this solution, the temperature values collected by N temperature sensors at the intake system end of the engine of the vehicle are obtained, N≥3; the i-th temperature is obtained respectively The absolute value of the difference between the temperature value collected by the sensor and the temperature values collected by the remaining N-1 temperature sensors, 1≤i≤N; if the number of absolute values of the difference greater than the preset value is not less than the preset number, It is determined that the i-th temperature sensor is unreliable. Compare the temperature values collected by one temperature sensor with the temperature values collected by the remaining temperature sensors to obtain the absolute value of N-1 difference values, and then determine whether it is impossible to determine whether the absolute value of the difference is N-1 times through the process of judging the absolute value of the difference value. letter, reducing the probability of misjudgment.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the prior art and the drawings required in the embodiments. Obviously, the drawings in the following description are only some of the drawings in the present application. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a flowchart of a method for determining the reliability of a temperature sensor provided by the application;

Fig. 2 is a kind of flow chart of obtaining two-dimensional array provided by this application;

3 is a schematic structural diagram of a reliability determination system for a temperature sensor provided by the application;

4 is a schematic structural diagram of a reliability determination device for a temperature sensor provided by the application;

FIG. 5 is a schematic structural diagram of an air intake system of an engine provided by the application.

Detailed ways

The core of the present application is to provide a method for determining the reliability of a temperature sensor and related components. In this solution, the temperature values collected by one temperature sensor are compared with the temperature values collected by the remaining temperature sensors, and N-1 temperature values are obtained. The absolute value of the difference is determined by N-1 times of judging the absolute value of the difference to determine whether it is unreliable, which reduces the probability of misjudgment.

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

1 is a flowchart of a method for determining the reliability of a temperature sensor provided by the application, including:

S11: Obtain the temperature values collected by N temperature sensors at the intake system end of the engine of the vehicle, N≥3;

S12: Obtain the absolute value of the difference between the temperature value collected by the ith temperature sensor and the temperature values collected by the remaining N-1 temperature sensors, respectively, 1≤i≤N;

S13: If the number of absolute values of the difference greater than the preset value is not less than the preset number, it is determined that the ith temperature sensor is unreliable.

In June 2018, the Ministry of Ecology and Environment of the People's Republic of China and the State Administration for Market Regulation issued the standard of "Limits and Measurement Methods for Pollutant Emissions from Heavy-Duty Diesel Vehicles (China Phase VI)". With the increasing awareness of environmental protection and stricter emission regulations, the regulations put forward clear requirements on the tamper-proof of sensors that affect emissions, and the sensors need to be monitored and diagnosed under specific conditions.

Heavy-duty engines have begun to implement the national sixth stage standard. Compared with the fifth stage, it is not only the change in emission limits, but also the upgrade of related monitoring strategies. The system is a computer system installed on the car and the engine. It belongs to the pollution control device. It has the functions of: diagnosing the faults affecting the engine emission performance; displaying through the alarm system when the fault occurs; determining by the information stored in the electronic control unit memory possible fault areas and provide information off-line communication) put forward more stringent requirements. In heavy duty diesel engines, temperature sensors are an important part of emissions control. The entire engine system has multiple temperature sensors. Generally, there are an ambient temperature sensor, an EGR downstream temperature sensor, an intake manifold temperature sensor, and an air flow meter temperature sensor at the intake system end of the vehicle's engine.

If one of these temperature sensors is inaccurate or has a serious deviation, it will have a significant negative impact on the intake air volume control and EGR components of the engine, resulting in deterioration of combustion, excessive emissions, and pollution. In the prior art, the temperature value collected by each temperature sensor is separately monitored, and its reliability is judged. For example, the intake manifold temperature sensor collects the intake air temperature value, and the processor can determine the current intake air temperature value and the last time the engine was turned off. Whether the difference between the intake air temperature values of the engine is within the preset value range, if so, it is determined that the intake air temperature value collected by the intake manifold temperature sensor is normal. The sensor cannot be trusted. It is too arbitrary to judge whether it is unreliable through a judgment process, and the probability of misjudgment is high.

In addition, in the prior art, the temperature sensor is judged to be unreliable (tampered with) by comparing the model temperature with the actual temperature. It also monitors the reliability of the temperature sensor alone, and when compared with the model temperature, the actual temperature collected needs to consider the influence of various factors, and the monitoring logic for the actual temperature is more complicated; and the calibration temperature sensor in the model temperature is not reliable. The cost cycle It is long, expensive and expensive, and the temperature of the model temperature calibration is not accurate enough, and it fluctuates greatly under the influence of transient conditions, which is prone to false alarms and errors. Therefore, there are many disadvantages in judging the reliability of the temperature sensor by the model temperature.

However, in the present application, the reliability of the temperature sensor is determined by comparing multiple temperature sensors with each other, which avoids the problem of high misjudgment rate caused by monitoring and judging the reliability of the temperature sensor independently.

Specifically, the temperature values collected by N temperature sensors at the intake system end of the engine of the vehicle need to be obtained first; then the temperature values collected by the i-th temperature sensor and the temperature values collected by the remaining temperature sensors are respectively subtracted to obtain The absolute value of N-1 difference values; finally determine the number of absolute values of the above N-1 difference values that are greater than the preset value, that is, when the temperature value collected by the i-th temperature sensor is the same as that of most of the remaining temperature sensors When there is a big difference in the collected temperature values, it is determined that the i-th temperature sensor is unreliable. Wherein, the i-th temperature sensor may be the first, the second, up to the N-th temperature sensor among the N temperature sensors, and the reliability of the N temperature sensors can be simultaneously judged by the above method. In addition, the monitoring and judgment of the reliability of each temperature sensor can be carried out in real time, so that it can respond in time in the event of an untrustworthy situation, prompt the driver to find the problem and deal with it in time, and prevent the occurrence of excessive emissions.

At the same time, since one temperature sensor cannot generate a difference, the absolute value of the difference between the two temperature sensors is meaningless (it cannot be judged that the absolute value of the difference is greater than the preset value which is caused by which temperature sensor is unreliable). Therefore, here The number of temperature sensors N ≥ 3, and considering that the number of temperature sensors set at the intake system end of the engine is generally fixed and not very large, the number N of temperature sensors can be limited to 3, 4 or 5, that is The reliability of up to 5 temperature sensors can be diagnosed at the same time, which can meet the needs of application scenarios.

It is also considered that when the relatively stable temperature value collected by the temperature sensor is obtained, the reliability determination has higher practical significance, so it can be limited to obtain the temperature value collected by the temperature sensor under certain operating conditions, such as the engine is in a cold start. At this time, the temperature is more stable, and it is more conducive to determine the reliability of the temperature sensor.

To sum up, the present application provides a method for determining the reliability of a temperature sensor. In this solution, the temperature values collected by N temperature sensors at the intake system end of the engine of the vehicle are obtained, N≥3; the i-th temperature is obtained respectively. The absolute value of the difference between the temperature value collected by the sensor and the temperature values collected by the remaining N-1 temperature sensors, 1≤i≤N; if the number of absolute values of the difference greater than the preset value is not less than the preset number, It is determined that the i-th temperature sensor is unreliable. Compare the temperature values collected by one temperature sensor with the temperature values collected by the remaining temperature sensors to obtain the absolute value of N-1 difference values, and then determine whether it is impossible to determine whether the absolute value of the difference is N-1 times through the process of judging the absolute value of the difference value. letter, reducing the probability of misjudgment.

On the basis of the above-mentioned embodiment:

As a preferred embodiment, the preset number is N-1.

In this embodiment, it is specifically limited that the preset number can be N-1, that is, when the temperature value collected by the i-th temperature sensor is quite different from the temperature values collected by all the remaining temperature sensors (N-1) ( When the absolute value of the difference is greater than the preset value), the ith temperature sensor is determined to be unreliable, and the highest standard for judging the unreliability of the temperature sensor in this scheme is set, so that the unreliable determination of the temperature sensor is stricter and the possibility of misjudgment is reduced. probability. The preset number is not fixed, and can be set according to actual application scenarios, which is not particularly limited here.

In addition, after the design of this scheme is completed, corresponding experiments can be carried out to verify the reliability and accuracy of this scheme. The engine is in the cold start stage, N=4, the preset number is N-1, and the four temperature sensors are respectively Take the ambient temperature sensor, EGR downstream temperature sensor, intake manifold temperature sensor and air flow meter temperature sensor as examples to conduct experiments.

Specifically, during the cold start stage of the engine, the temperature values of the four temperature sensors are collected. When the absolute value of the difference between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor is greater than the preset value, The array element that records the first temperature sensor is 1 (the number of failures is 1), otherwise it is recorded as 0. When the sum of the array elements recorded by the first temperature sensor is not less than N-1, that is, 3, it is judged that the temperature value of the first temperature sensor is abnormal, and the first temperature sensor is unreliable. At this time, the first temperature sensor can be triggered. The alarm information corresponding to a temperature sensor reminds the driver to deal with the problem in time to ensure the normal operation of the engine; each temperature sensor and the remaining temperature sensors are compared and recorded in the above experimental process, and the final experimental results can be obtained through the two-dimensional Summarize in the form of an array table, such as Table 1. Table 1 is a two-dimensional data table. The rows and columns are the temperature sensors respectively. Each row corresponds to the fault information of the temperature sensor in this row and all temperature sensors. A, B, C and D are the names of four temperature sensors. At this time, the specific operation process of obtaining the two-dimensional array of A can refer to Figure 2. The array elements of A and A can be directly filled with 0. If the difference between the temperature values of A and B is is greater than the preset value, then the array element in row A and column B is recorded as 1, otherwise it is 0, and 1 represents the number of faults, indicating that the temperature values of A and B have a large deviation, and A may fail. The sum of all array elements is not less than the total number N of temperature sensors minus 1 (that is, 3), which means that there is a large deviation between the temperature values of A and the remaining three temperature sensors, and it is judged that A is unreliable. When checking the credibility of A, B, C, and D are also checked synchronously, and the logical steps of judging are the same as those of A.

Table 1

Temperature Sensor A B C D sum A B C D

More specific implementation steps and experimental results are as follows:

1. Install normal (fault-free) ambient temperature sensor, EGR downstream temperature sensor, intake manifold temperature sensor, and air flow temperature sensor in the intake system of the engine, and conduct experiments when the engine is in the cold start stage. The experimental results are as follows :

Table 2

As shown in Table 2, Table 2 is the first experimental result. When the engine is in the cold start stage, the absolute value of the difference between the four temperature sensors does not exceed the preset value. The array elements are all 0, and the sum of the array elements of each temperature sensor (the sum of the number of faults) is 0, indicating that the four temperature sensors are normal; the experimental results are consistent with the preset, and the determination method is reliable.

2. Put the ambient temperature sensor in the constant temperature furnace in the intake system of the engine (the temperature value collected no longer changes, and an untrustworthy fault occurs, so as to simulate the abnormality of the temperature sensor), and install a normal (fault-free) EGR The downstream temperature sensor, the intake manifold temperature sensor and the air flow meter temperature sensor are tested when the engine is in the cold start stage, and the experimental results are as follows:

table 3

As shown in Table 3, Table 3 is the second experimental result. When the engine is in the cold start stage, when the temperature value collected by the ambient temperature sensor remains unchanged, the absolute value of the difference between it and the temperature values of the other three temperature sensors are greater than the preset value, and the sum of the array elements of the ambient temperature sensor (the total number of faults) is 3, then it is determined that the ambient temperature sensor is unreliable, and the alarm information is triggered; and the sum of the remaining array elements of each temperature sensor (the number of faults) The sum) is lower than 3, which is a normal state, credible, and will not trigger alarm information; the experimental results are consistent with the preset, and the determination method is reliable.

3. Put the EGR downstream temperature sensor in the constant temperature furnace in the intake system of the engine (the temperature value collected no longer changes, and an untrustworthy fault occurs, so as to simulate the abnormality of the temperature sensor), and install the normal (fault-free) temperature sensor. The ambient temperature sensor, the intake manifold temperature sensor and the air flow meter temperature sensor are tested when the engine is in the cold start stage. The experimental results are as follows:

Table 4

As shown in Table 4, Table 4 is the third experimental result. When the engine is in the cold start stage, when the temperature value collected by the EGR downstream temperature sensor remains unchanged, the absolute difference between it and the temperature values of the other three temperature sensors If the value is greater than the preset value, the sum of the array elements of the EGR downstream temperature sensor (sum of the number of faults) is 3, then it is determined that the EGR downstream temperature sensor is unreliable and an alarm message is triggered; and the sum of the remaining array elements of each temperature sensor (The total number of faults) is lower than 3, which is a normal state, reliable, and will not trigger the alarm information; the experimental results are consistent with the preset, and the determination method is reliable.

4. Put the intake manifold temperature sensor in the constant temperature furnace in the intake system of the engine (the temperature value collected no longer changes, and an untrustworthy fault occurs, so as to simulate the abnormality of the temperature sensor), and the installation is normal (no fault). ) of the ambient temperature sensor, EGR downstream temperature sensor and air flow meter temperature sensor, experiments were carried out when the engine was in the cold start stage, and the experimental results were as follows:

table 5

As shown in Table 5, Table 5 is the fourth experimental result. When the engine is in the cold start stage, when the temperature value collected by the intake manifold temperature sensor remains unchanged, the difference between it and the temperature values of the other three temperature sensors The absolute value of the temperature sensor is greater than the preset value, and the sum of the array elements of the intake manifold temperature sensor (the sum of the number of failures) is 3, then it is determined that the intake manifold temperature sensor is not reliable, and an alarm message is triggered; The sum of the array elements of the sensor (the sum of the number of faults) is lower than 3, which is a normal state, reliable, and will not trigger an alarm message; the experimental results are consistent with the preset, and the determination method is reliable.

5. Put the temperature sensor of the air flow meter in the constant temperature furnace in the intake system of the engine (the temperature value collected no longer changes, and an untrustworthy fault occurs, so as to simulate the abnormality of the temperature sensor), and the installation is normal (no fault). The ambient temperature sensor, the EGR downstream temperature sensor and the intake manifold temperature sensor are tested when the engine is in the cold start stage. The experimental results are as follows:

Table 6

As shown in Table 6, Table 6 is the fifth experimental result. When the engine is in the cold start stage, when the temperature value collected by the air flow meter temperature sensor remains unchanged, the difference between it and the temperature values of the other three temperature sensors is If the absolute value is greater than the preset value, it is concluded that the sum of the array elements of the air flow meter temperature sensor (the sum of the number of failures) is 3, then it is determined that the air flow meter temperature sensor is unreliable and an alarm message is triggered; and the remaining arrays of each temperature sensor The sum of the elements (the sum of the number of faults) is lower than 3, which is a normal state, reliable, and will not trigger an alarm message; the experimental results are consistent with the preset, and the determination method is reliable.

The above experimental results are the results of diagnosing the ambient temperature sensor, EGR downstream temperature sensor, intake manifold temperature sensor and air flow meter temperature sensor at the same time. After the experimental results are obtained, it can directly reflect whether the temperature values of all temperature sensors exist. Exception, that is, whether it is credible or not. A temperature sensor that can accurately determine the occurrence of unreliable conditions, and respond in real time when the temperature sensor is unreliable.

As a preferred embodiment, after determining that the i-th temperature sensor is untrustworthy, the method further includes:

Control the alarm module to alarm.

In this embodiment, after judging that a certain temperature sensor is not credible, the alarm module can be controlled to trigger an alarm for the temperature sensor; it can also be controlled to trigger the alarm module corresponding to the temperature sensor to send out alarm information; thereby prompting the driver to find out the problem and to warn the driver. Deal with it in time to ensure the normal operation of the engine, improve reliability, and avoid excessive engine emissions caused by unreliable temperature sensors, and protect the environment.

As a preferred embodiment, after determining that the i-th temperature sensor is untrustworthy, the method further includes:

Sending a torque limit command to the engine keeps the engine in a low-power operating state.

In this embodiment, after determining that a certain temperature sensor is untrustworthy, a torque limit instruction can be sent to the engine to control the engine to be in a low power consumption working state, so as to reduce the adverse effect of the untrustworthy temperature sensor on the operation of the engine. At the same time, after judging that a certain temperature sensor is unreliable, an alarm and a torque limit instruction can be sent to the engine at the same time, so as to achieve the best troubleshooting effect.

As a preferred embodiment, when N is 4, the N temperature sensors are an ambient temperature sensor, an intake manifold temperature sensor, an EGR downstream temperature sensor and an air flow meter temperature sensor, respectively.

In this embodiment, four commonly used temperature sensors at the intake system end of the engine are limited, specifically the ambient temperature sensor, the intake manifold temperature sensor, the EGR downstream temperature sensor and the air flow meter temperature sensor, which are suitable for the intake system of the engine. Most of the application scenarios in which temperature sensors are used.

As a preferred embodiment, acquiring the temperature values collected by N temperature sensors at the air intake system end of the engine of the vehicle includes:

Under a preset condition, the temperature values collected by N temperature sensors at the air intake system end of the engine of the vehicle are acquired, and the preset condition is that the engine is in a working state of cold start.

In this embodiment, when the transmitter is in the working state of cold start, the temperature values of the N temperature sensors monitored and acquired are relatively stable, and the unreliable judgment made by using these temperature values is more accurate, reducing the probability of misjudgment , while bringing a better driving experience to the driver.

Specifically, the working state of the engine in a cold start can satisfy two conditions: one is that the time after the engine is turned off exceeds 8 hours; the other is that the engine speed is 0, or the engine speed is greater than 0 and the duration is less than 3s; in the above Unreliable diagnosis under conditions is more accurate.

As a preferred embodiment, the preset conditions further include that the intake air heater is not turned on and the self-test results of the N temperature sensors are normal.

In this embodiment, the preset conditions can be continuously increased in addition to the working state of the engine being in a cold start state. For example, the engine intake air heater is not turned on and the self-check results of the N temperature sensors are normal. In this specific working condition The lower temperature fully reduces the interference when the temperature sensor in the intake system is judged to be unreliable, so that the obtained temperature value is more stable and the judgment accuracy is improved. Wherein, the normal self-check result of the temperature sensor may mean that the temperature sensor has been released, the detection conditions are met, and the temperature sensor has no signal failure.

Please refer to FIG. 3. FIG. 3 is a schematic structural diagram of a reliability determination system for a temperature sensor provided by the application, including:

A temperature acquisition unit 21, configured to acquire temperature values collected by N temperature sensors at the air intake system end of the engine of the vehicle, N≥3;

The absolute value obtaining unit 22 of the difference is used to obtain the absolute value of the difference between the temperature value collected by the i-th temperature sensor and the temperature values collected by the remaining N-1 temperature sensors, 1≤i≤N;

The unreliable determination unit 23 is configured to determine that the i-th temperature sensor is unreliable if the absolute value of the difference greater than the preset value is not less than the preset number.

For the introduction of a reliability determination system for a temperature sensor provided by the present application, please refer to the above-mentioned embodiments, which will not be repeated in this application.

Please refer to FIG. 4. FIG. 4 is a schematic structural diagram of a device for determining reliability of a temperature sensor provided by the application, including:

memory 31 for storing computer programs;

The processor 32 is configured to execute the computer program to realize the steps of the above-mentioned method for determining the reliability of the temperature sensor.

For the introduction of a reliability determination device for a temperature sensor provided in the present application, please refer to the above-mentioned embodiments, which will not be repeated in this application.

Please refer to FIG. 5. FIG. 5 is a schematic structural diagram of an air intake system of an engine provided by the application. In FIG. 4, N=4 is taken as an example, which includes N temperature sensors arranged at the end of the air intake system of the engine, and also includes a temperature sensor. The reliability determination device of the sensor, N≥3.

For the introduction of a reliability determination device for a temperature sensor in an air intake system of an engine provided by the present application, please refer to the above-mentioned embodiments, which will not be repeated in this application.

It should be noted that, in this specification, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements , but also other elements not expressly listed or inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, this application is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. a reliability determination method of a temperature sensor, is characterized in that, comprises: Obtain the temperature values collected by N temperature sensors at the intake system end of the engine of the vehicle, N≥3; Obtain the absolute value of the difference between the temperature value collected by the i-th temperature sensor and the temperature values collected by the remaining N-1 temperature sensors, 1≤i≤N; If the number of absolute values of the difference greater than the preset value is not less than the preset number, it is determined that the i-th temperature sensor is unreliable. 2 . The reliability determination method of a temperature sensor according to claim 1 , wherein the preset number is N−1. 3 . 3. The method for determining the reliability of a temperature sensor according to claim 1, wherein after determining that the i-th temperature sensor is unreliable, the method further comprises: Control the alarm module to alarm. 4. The method for determining the reliability of a temperature sensor according to claim 1, wherein after determining that the i-th temperature sensor is unreliable, the method further comprises: Sending a torque-limiting command to the engine places the engine in a low-power operating state. 5 . The reliability determination method of a temperature sensor according to claim 1 , wherein when N is 4, the N temperature sensors are respectively an ambient temperature sensor, an intake manifold temperature sensor, and an EGR downstream temperature sensor. 6 . and air flow meter temperature sensor. 6. The method for determining the reliability of a temperature sensor according to any one of claims 1 to 5, wherein obtaining the temperature values collected by N temperature sensors at the air intake system end of the engine of the vehicle, comprising: Under a preset condition, the temperature values collected by N temperature sensors at the air intake system end of the engine of the vehicle are acquired, and the preset condition is that the engine is in a working state of cold start. 7 . The reliability determination method of a temperature sensor according to claim 6 , wherein the preset conditions further include that the intake air heater is not turned on and the self-check results of the N temperature sensors are normal. 8 . 8. A reliability determination system for a temperature sensor, comprising: A temperature acquisition unit, used to acquire the temperature values collected by N temperature sensors at the intake system end of the engine of the vehicle, N≥3; The absolute value acquisition unit of the difference value is used to respectively acquire the absolute value of the difference between the temperature value collected by the i-th temperature sensor and the temperature values collected by the remaining N-1 temperature sensors, 1≤ i≤N; An unreliable determination unit, configured to determine that the i-th temperature sensor is unreliable if the absolute value of the difference greater than the preset value is not less than the preset number. 9. A reliability determination device for a temperature sensor, comprising: memory for storing computer programs; The processor is configured to execute the computer program to implement the steps of the method for determining the reliability of the temperature sensor in any one of 1 to 7 above. 10 . An air intake system of an engine, characterized in that it comprises N temperature sensors arranged at the end of the air intake system of the engine, and further comprises the reliability determination device of the temperature sensor according to claim 9 , where N≧3.

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