CN116973007A

CN116973007A - Temperature sensor abnormality detection method, device, equipment and storage medium thereof

Info

Publication number: CN116973007A
Application number: CN202310947687.9A
Authority: CN
Inventors: 李万程; 郭永斌; 孙昊; 王建夺; 张明
Original assignee: Zhejiang Geely Holding Group Co Ltd; Zhejiang Remote Commercial Vehicle R&D Co Ltd; Zhejiang Geely Remote New Energy Commercial Vehicle Group Co Ltd
Current assignee: Zhejiang Geely Holding Group Co Ltd; Zhejiang Remote Commercial Vehicle R&D Co Ltd; Zhejiang Geely Remote New Energy Commercial Vehicle Group Co Ltd
Priority date: 2023-07-28
Filing date: 2023-07-28
Publication date: 2023-10-31

Abstract

The application discloses a temperature sensor abnormality detection method, a temperature sensor abnormality detection device, temperature sensor abnormality detection equipment and a temperature sensor abnormality detection storage medium, and belongs to the technical field of vehicles. The temperature sensor abnormality detection method includes: dynamically acquiring first temperature data of the cooling liquid, which are acquired by a cooling liquid temperature sensor; determining a first temperature change amplitude of the cooling liquid according to the first temperature data of the cooling liquid, wherein the first temperature change amplitude is the maximum temperature change amplitude of the first temperature data of the cooling liquid within a preset acquisition time interval; when the first temperature change amplitude is smaller than a preset abnormal amplitude threshold value and the abnormal duration time of which the first temperature change amplitude is smaller than the preset abnormal amplitude threshold value is longer than the preset first time threshold value, judging that the temperature sensor is abnormal, and executing a preset temperature sensor abnormality processing strategy. The application solves the technical problem of lower abnormality detection accuracy of the cooling liquid temperature sensor in the prior art.

Description

Temperature sensor abnormality detection method, device, equipment and storage medium thereof

Technical Field

The present application relates to the field of vehicle technologies, and in particular, to a method, an apparatus, a device, and a storage medium for detecting abnormality of a temperature sensor.

Background

In the thermal management of a vehicle, a coolant temperature sensor plays a vital role, and can be used to monitor the coolant temperature of a vehicle power plant (e.g., generator, engine, etc.), thereby controlling the coolant temperature to remain within a normal range. However, once the temperature sensor is abnormal and the abnormality cannot be recognized in time, the data acquired by the temperature sensor is inaccurate, and then the temperature control of the vehicle power device is invalid, so that the vehicle is damaged. Therefore, it is necessary to monitor the operation state of the temperature sensor to determine whether an abnormality occurs.

The conventional mode is to set a temperature threshold, and judge that the cooling liquid temperature sensor is abnormal when the temperature data acquired by the cooling liquid temperature sensor is larger than or smaller than a preset temperature threshold; however, this method can only detect the abnormal condition of open circuit or short circuit of the coolant temperature sensor, and the detection accuracy of the viscous abnormality (the collected temperature data is unchanged) of the coolant temperature sensor is low.

The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present application and is not intended to represent an admission that the foregoing is prior art.

Disclosure of Invention

The application mainly aims to provide a temperature sensor abnormality detection method, which aims to solve the technical problem of low abnormality detection accuracy of a cooling liquid temperature sensor.

In order to achieve the above object, the present application provides a temperature sensor abnormality detection method including:

dynamically acquiring first temperature data of the cooling liquid, which are acquired by a cooling liquid temperature sensor;

determining a first temperature change amplitude of the cooling liquid according to the first temperature data of the cooling liquid, wherein the first temperature change amplitude is the maximum temperature change amplitude of the first temperature data of the cooling liquid in a preset acquisition time interval;

and when the first temperature change amplitude is smaller than a preset abnormal amplitude threshold value and the abnormal duration time of which the first temperature change amplitude is smaller than the preset abnormal amplitude threshold value is longer than a preset first time length threshold value, judging that the temperature sensor is abnormal, and executing a preset temperature sensor abnormality processing strategy.

Optionally, before the step of determining that the temperature sensor is abnormal, the method further includes:

acquiring working condition parameters of the power device with the temperature controlled by the cooling liquid, and determining the predicted temperature of the power device under the working condition parameters according to a mapping relation between the preset working condition parameters and the temperature of the power device;

judging whether the absolute value of the temperature difference between the predicted temperature of the power device and the actual temperature of the power device acquired by a temperature sensor of the power device is larger than a preset temperature difference threshold value or not;

If yes, executing the step of judging that the temperature sensor is abnormal;

if not, judging whether the cooling liquid temperature sensor is suspected to be abnormal, and judging whether the duration of the abnormality is larger than a preset second duration threshold, wherein the first duration threshold is smaller than the second duration threshold.

Optionally, after the step of determining whether the abnormal duration is greater than a preset second duration threshold, the method includes:

if the abnormal duration is longer than the second duration threshold, executing the step of judging that the temperature sensor is abnormal;

if the abnormal duration is smaller than or equal to the second duration threshold, judging that the cooling liquid temperature sensor is normal, and resetting the abnormal duration.

Optionally, after the step when the first temperature change amplitude is smaller than a preset abnormal amplitude threshold, the method includes:

acquiring a target torque of the power device which is in temperature control with the cooling liquid;

the step of executing the preset temperature sensor abnormality processing strategy comprises the following steps:

controlling the running torque of the power device according to the target torque;

determining a first temperature control gear adapted to the target torque according to a mapping relation between a preset torque and the temperature control gear, wherein the temperature control gear is a working gear of a temperature control device of the power device;

And determining a target temperature control gear of the temperature control device according to the first temperature control gear and the current temperature control gear of the temperature control device, and controlling the temperature control device to respond to the target temperature control gear so as to change the temperature of the cooling liquid.

Optionally, the step of controlling the operating torque of the power plant according to the target torque includes:

acquiring the required torque of the power device, and judging whether the required torque is smaller than the target torque;

if yes, taking the required torque as the running torque;

and if not, taking the target torque as the running torque.

Optionally, after the step of executing the preset temperature sensor abnormality processing policy, the method further includes:

dynamically acquiring second temperature data of the cooling liquid acquired by the cooling liquid temperature sensor;

determining a second temperature change amplitude of the cooling liquid according to the second temperature data of the cooling liquid, and judging whether the second temperature change amplitude in a preset temperature control duration is greater than or equal to the abnormal amplitude threshold;

if yes, judging that the cooling liquid temperature sensor is normal, and releasing the abnormal processing strategy of the temperature sensor;

If not, judging that the cooling liquid temperature sensor fails, and outputting a preset failure signal.

Optionally, after the step when the first temperature change amplitude is smaller than a preset abnormal amplitude threshold, the method further includes:

and if the first temperature change amplitude is larger than or equal to a preset abnormal amplitude threshold in the first time length threshold, resetting the abnormal duration.

The application also provides a temperature sensor abnormality detection device, which comprises:

the acquisition module is used for dynamically acquiring the first temperature data of the cooling liquid acquired by the cooling liquid temperature sensor;

the determining module is used for determining a first temperature change amplitude of the cooling liquid according to the first temperature data of the cooling liquid, wherein the first temperature change amplitude is the maximum temperature change amplitude of the first temperature data of the cooling liquid in a preset acquisition time interval;

and the execution module is used for judging that the temperature sensor is abnormal when the first temperature change amplitude is smaller than a preset abnormal amplitude threshold value and the abnormal duration time of the first temperature change amplitude smaller than the preset abnormal amplitude threshold value is longer than a preset first time threshold value, and executing a preset temperature sensor abnormality processing strategy.

The application also provides an electronic device comprising: the temperature sensor abnormality detection device comprises a memory, a processor and a temperature sensor abnormality detection program stored on the memory and capable of running on the processor, wherein the temperature sensor abnormality detection program is configured to realize the steps of the temperature sensor abnormality detection method.

The present application also provides a storage medium, which is a computer readable storage medium, and the computer readable storage medium stores a temperature sensor abnormality detection program, where the temperature sensor abnormality detection program is executed by a processor to implement the steps of the above-mentioned temperature sensor abnormality detection method.

The application discloses a temperature sensor abnormality detection method, which comprises the steps of dynamically acquiring first temperature data of cooling liquid acquired by a cooling liquid temperature sensor; further, according to the first temperature data of the cooling liquid, a first temperature change amplitude of the cooling liquid is determined, wherein the first temperature change amplitude is the maximum temperature change amplitude of the first temperature data of the cooling liquid in a preset acquisition time interval; because the working condition of the vehicle in the running process is dynamically changed, the temperature of the power device is also changed along with the working condition, and the temperature of the cooling liquid for controlling the temperature of the power device is also dynamically changed in order to ensure that the temperature of the power device is kept within a safe range; therefore, by determining the temperature change amplitude of the cooling liquid, whether the cooling liquid temperature sensor has viscous abnormal conditions or not can be rapidly judged; further, when the first temperature change amplitude is smaller than a preset abnormal amplitude threshold, recording the abnormal duration time when the first temperature change amplitude is smaller than the preset abnormal amplitude threshold; if the abnormal duration time is longer than a preset first time threshold, indicating that the temperature data acquired by the cooling liquid temperature sensor is in a state of almost unchanged for a long time, judging that the temperature sensor is abnormal; on the basis of setting the abnormal judgment threshold value of the temperature change amplitude, the abnormal time judgment of the temperature change amplitude is increased, the abnormal judgment accuracy of the cooling liquid temperature sensor is improved through the combination of the change amplitude and the time, so that the situation that the temperature data acquired by the cooling liquid temperature sensor is not changed normally is avoided, the cooling liquid temperature sensor is judged to be abnormal in error, the abnormal situation of the cooling liquid temperature sensor is detected rapidly and accurately, and after the abnormal situation of the temperature sensor is judged, a preset abnormal temperature sensor processing strategy is executed, so that the damage of a vehicle power device is avoided, and the driving safety is ensured.

Drawings

FIG. 1 is a schematic diagram of an electronic device in a hardware operating environment according to an embodiment of the present application;

FIG. 2 is a schematic flow chart of a method for detecting abnormality of a temperature sensor according to an embodiment of the present application;

FIG. 3 is a detailed flowchart of an embodiment of the step S30 in FIG. 2;

FIG. 4 is a flowchart of a more complete embodiment of a method for detecting anomalies in a temperature sensor according to an embodiment of the present application;

fig. 5 is a schematic frame structure of a temperature sensor abnormality detection device according to an embodiment of the present application.

The achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, "and/or" throughout this document includes three schemes, taking a and/or B as an example, including a technical scheme, a technical scheme B, and a technical scheme that both a and B satisfy; in addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electronic device in a hardware running environment according to an embodiment of the present application.

As shown in fig. 1, the electronic device may include: a processor 1001, such as a central processing unit (Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, a memory 1005. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display, an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WIreless-FIdelity (WI-FI) interface). The Memory 1005 may be a high-speed random access Memory (Random Access Memory, RAM) Memory or a stable nonvolatile Memory (NVM), such as a disk Memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.

Those skilled in the art will appreciate that the structure shown in fig. 1 is not limiting of the electronic device and may include more or fewer components than shown, or may combine certain components, or may be arranged in different components.

As shown in fig. 1, an operating system, a data storage module, a network communication module, a user interface module, and a temperature sensor abnormality detection program may be included in the memory 1005 as one type of storage medium.

In the electronic device shown in fig. 1, the network interface 1004 is mainly used for data communication with other devices; the user interface 1003 is mainly used for data interaction with a user; the processor 1001, the memory 1005 in the electronic device of the present application may be provided in an electronic device that calls a temperature sensor abnormality detection program stored in the memory 1005 through the processor 1001 and performs the following operations:

Further, the processor 1001 may call a temperature sensor abnormality detection program stored in the memory 1005, and also perform the following operations:

before the operation of determining that the temperature sensor is abnormal, further comprising:

if yes, executing the operation of judging the abnormality of the temperature sensor;

after the operation of judging whether the abnormal duration is greater than a preset second duration threshold, the method comprises the following steps:

If the abnormal duration is longer than the second duration threshold, executing the operation of judging the abnormality of the temperature sensor;

after the operation when the first temperature change amplitude is smaller than a preset abnormal amplitude threshold value, the method comprises the following steps:

the operation of executing the preset temperature sensor abnormality processing strategy comprises the following steps:

Further, the operation of controlling the running torque of the power device according to the target torque includes:

if yes, taking the required torque as the running torque;

and if not, taking the target torque as the running torque.

after the operation of executing the preset temperature sensor abnormality processing strategy, the method further comprises the following steps:

after the operation when the first temperature change amplitude is smaller than a preset abnormal amplitude threshold, the method further comprises:

Based on the above-described structure, various embodiments of a temperature sensor abnormality detection method are proposed.

Referring to fig. 2, fig. 2 is a flowchart of a first embodiment of a temperature sensor abnormality detection method according to the present application.

In this embodiment, the execution body of the temperature sensor abnormality detection method may be an electronic device, the electronic device may be a local device, such as an electronic control system of a vehicle, and the electronic device may also be a network device, which is not limited in this embodiment, and for convenience of description, description of each embodiment of the execution body is omitted. In the present embodiment, the temperature sensor abnormality detection method includes:

step S10, first temperature data of the cooling liquid, which are acquired by a cooling liquid temperature sensor, are dynamically acquired;

during the running of the vehicle, the temperature of the power device (such as a generator, an engine and the like) of the vehicle can dynamically change, and in order to ensure that the temperature of the power device is within a safe range, the temperature of the power device needs to be controlled by adjusting the temperature of the cooling liquid; furthermore, in order to ensure the accuracy of temperature control, a cooling liquid temperature sensor is arranged in a cooling liquid pipeline and used for collecting the temperature value of the cooling liquid; and further, coolant temperature data (hereinafter referred to as coolant first temperature data for showing distinction) collected by the coolant temperature sensor are dynamically acquired, and the temperature data may be temperature values at different moments.

The time interval for dynamically acquiring the first temperature data of the cooling liquid acquired by the cooling liquid temperature sensor can be determined according to actual conditions, and the embodiment is not limited to this, for example, the time interval for dynamically acquiring the first temperature data is small enough, so that the first temperature data is basically acquired in real time, the running state of the cooling liquid temperature sensor is determined more timely, and the real-time performance of abnormal detection of the temperature sensor is further enhanced.

Step S20, determining a first temperature change amplitude of the cooling liquid according to the first temperature data of the cooling liquid, wherein the first temperature change amplitude is the maximum temperature change amplitude of the first temperature data of the cooling liquid in a preset acquisition time interval;

analyzing the first temperature data of the cooling liquid to determine the maximum temperature change amplitude of the first temperature data of the cooling liquid in a preset acquisition time interval, wherein the maximum temperature change amplitude is used as the first temperature change amplitude of the cooling liquid; the first temperature change amplitude may be a difference between a maximum temperature value and a minimum temperature value within an acquisition time interval; the acquisition time interval may be set according to practical situations, which is not limited in this embodiment.

And step S30, when the first temperature change amplitude is smaller than a preset abnormal amplitude threshold value and the abnormal duration time of which the first temperature change amplitude is smaller than the preset abnormal amplitude threshold value is longer than a preset first time threshold value, judging that the temperature sensor is abnormal, and executing a preset temperature sensor abnormality processing strategy.

Under normal conditions, the temperature of the cooling liquid can fluctuate to a certain extent within the acquisition time interval, so that an abnormal amplitude threshold value is preset to judge the temperature change condition of the cooling liquid; if the first temperature change amplitude is smaller than the preset abnormal amplitude threshold, the coolant temperature value in the preset acquisition time interval is almost unchanged, which is possibly caused by viscosity abnormality of the coolant temperature sensor and stable running condition of the power device in the acquisition time interval, so that the coolant temperature is stable; recording the abnormal duration time when the first temperature change amplitude is smaller than the preset abnormal amplitude threshold value; if the abnormal duration time is longer than a preset first time threshold, indicating that the temperature data acquired by the cooling liquid temperature sensor is in a state of almost unchanged for a long time, judging that the temperature sensor is abnormal, and executing a preset temperature sensor abnormality processing strategy; wherein, the temperature sensor exception handling strategy includes: the cooling liquid temperature control strategy, the power device working condition control strategy and the abnormality reminding strategy are used for carrying out abnormal treatment on the cooling liquid temperature sensor from the three aspects of cooling liquid temperature control, vehicle power device running working condition control and abnormal condition reminding so as to avoid damage to the vehicle power device and ensure running safety.

The first time length threshold and the abnormal amplitude threshold may be set according to practical situations, which is not limited in the embodiment of the present application.

In a possible implementation manner, in step S30, after the step of when the first temperature change amplitude is smaller than a preset abnormal amplitude threshold, the method further includes:

and S31, if the first temperature change amplitude is greater than or equal to a preset abnormal amplitude threshold in the first time length threshold, resetting the abnormal duration.

If the first temperature change amplitude of the cooling liquid is larger than or equal to the abnormal amplitude threshold in the first time length threshold, the cooling liquid temperature in the acquisition time interval obviously fluctuates, namely the cooling liquid temperature sensor is normal, the abnormal duration is cleared, and the step of dynamically acquiring the first temperature data of the cooling liquid acquired by the cooling liquid temperature sensor is executed.

In the embodiment, first temperature data of the cooling liquid, which is acquired by a cooling liquid temperature sensor, is dynamically acquired; further, according to the first temperature data of the cooling liquid, a first temperature change amplitude of the cooling liquid is determined, wherein the first temperature change amplitude is the maximum temperature change amplitude of the first temperature data of the cooling liquid in a preset acquisition time interval; because the working condition of the vehicle in the running process is dynamically changed, the temperature of the power device is also changed along with the working condition, and the temperature of the cooling liquid for controlling the temperature of the power device is also dynamically changed in order to ensure that the temperature of the power device is kept within a safe range; therefore, by determining the temperature change amplitude of the cooling liquid, whether the cooling liquid temperature sensor has viscous abnormal conditions or not can be rapidly judged; further, when the first temperature change amplitude is smaller than a preset abnormal amplitude threshold, recording the abnormal duration time when the first temperature change amplitude is smaller than the preset abnormal amplitude threshold; if the abnormal duration time is longer than a preset first time threshold, indicating that the temperature data acquired by the cooling liquid temperature sensor is in a state of almost unchanged for a long time, judging that the temperature sensor is abnormal; on the basis of setting the abnormal judgment threshold value of the temperature change amplitude, the abnormal time judgment of the temperature change amplitude is increased, the abnormal judgment accuracy of the cooling liquid temperature sensor is improved through the combination of the change amplitude and the time, so that the situation that the temperature data acquired by the cooling liquid temperature sensor is not changed normally is avoided, the cooling liquid temperature sensor is judged to be abnormal in error, the abnormal situation of the cooling liquid temperature sensor is detected rapidly and accurately, and after the abnormal situation of the temperature sensor is judged, a preset abnormal temperature sensor processing strategy is executed, so that the damage of a vehicle power device is avoided, and the driving safety is ensured.

Further, based on the above-mentioned first embodiment, a second embodiment of the temperature sensor abnormality detection method according to the present application is proposed, referring to fig. 3, in this embodiment, before the step of determining that the temperature sensor is abnormal in step S30, the method further includes:

step S32, working condition parameters of the power device with the temperature controlled by the cooling liquid are obtained, and the predicted temperature of the power device under the working condition parameters is determined according to a mapping relation between the preset working condition parameters and the temperature of the power device;

acquiring current working condition parameters of the power device with the temperature controlled by the cooling liquid, wherein the working condition parameters can be one or more of torque, rotating speed, running power, vehicle speed and the like of the power device; and then the obtained working condition parameters are matched with the mapping relation between the preset working condition parameters and the temperature of the power device, so that the temperature of the power device (hereinafter referred to as the predicted temperature of the power device) of the power device under the working condition parameters is determined.

The mapping relationship between the preset working condition parameters and the temperature of the power device refers to the mutual corresponding relationship between the working condition parameters of the power device and the temperature of the power device, and can represent the temperature of the power device of the vehicle in different working condition states, and the mapping relationship can be a mapping table or a formula, and can also be a preset trained temperature prediction model.

The predicted temperature of the power device can be the temperature of the power device, which is obtained by controlling the temperature of the power device through cooling liquid, when the power device operates under the working condition parameters; for example, the power plant operates under the working condition parameter a, and the temperature of the power plant is 50 ℃ when the temperature control operation is not performed, but the operation process with the excessive temperature has potential safety hazards, so that the temperature of the power plant needs to be controlled to be 40 ℃ through cooling liquid, and the predicted temperature of the power plant is 40 ℃.

Step S33, judging whether the absolute value of the temperature difference between the predicted temperature of the power device and the actual temperature of the power device acquired by a temperature sensor of the power device is larger than a preset temperature difference threshold value;

the power device is provided with a power device temperature sensor for acquiring temperature data of the power device; further acquiring the actual temperature of the power device acquired by a temperature sensor of the power device, and judging whether the absolute value of the temperature difference between the predicted temperature of the power device and the actual temperature of the power device is larger than a preset temperature difference threshold value; because the predicted temperature of the power device is the temperature of the power device after temperature control by the cooling liquid under the working condition parameters, whether the temperature control of the cooling liquid is accurate can be accurately judged by judging the magnitude relation between the absolute value of the temperature difference between the predicted temperature of the power device and the actual temperature of the power device and the preset temperature difference threshold value, and whether the temperature data acquired by the cooling liquid temperature sensor is normal or not is further determined, namely whether the cooling liquid temperature sensor is abnormal or not is determined.

In a conventional manner, in order to avoid abnormality of the coolant temperature sensor, a plurality of backup coolant temperature sensors may be provided near the main coolant temperature sensor, and the operation condition of the coolant temperature sensor may be determined by data acquisition; however, the positions of the main and the standby temperature sensors are usually close, and if the reasons for abnormality of the cooling liquid temperature sensors are caused by external impact and other factors, the main and the standby cooling liquid temperature sensors may be damaged at the same time; the power device temperature sensor and the cooling liquid temperature sensor are arranged at different positions, so that the possibility of abnormal situations of the two temperature sensors can be greatly reduced.

Step S34, if yes, executing the step of judging that the temperature sensor is abnormal;

if the absolute value of the temperature difference between the predicted temperature of the power device and the actual temperature of the power device is larger than a preset temperature difference threshold value, the fact that a large difference exists between the actual temperature of the power device and the standard temperature control temperature exists is indicated, and further it is determined that the cooling liquid is abnormal in temperature control of the power device, namely, a cooling liquid temperature sensor is abnormal, and then the step of judging that the temperature sensor is abnormal is executed.

Step S35, if not, judging that the cooling liquid temperature sensor is suspected to be abnormal, and judging whether the duration of the abnormality is larger than a preset second duration threshold, wherein the first duration threshold is smaller than the second duration threshold.

If the absolute value of the temperature difference between the predicted temperature of the power device and the actual temperature of the power device is smaller than or equal to a preset temperature difference threshold value, the fact that the temperature difference between the actual temperature of the power device at the moment and the standard temperature control temperature is smaller is indicated, and further, the fact that the temperature of the cooling liquid on the power device is temporarily normal is determined, namely, the temperature of the power device of the vehicle is temporarily normal is determined, in order to avoid error judgment on abnormal conditions of the cooling liquid temperature sensor, the fact that the cooling liquid temperature sensor is suspected to be abnormal is determined, and a time duration threshold value for abnormality judgment of the cooling liquid temperature sensor is properly prolonged, namely, whether the abnormal time duration is larger than a preset second time duration threshold value is determined, wherein the first time duration threshold value is smaller than the second time duration threshold value.

In this embodiment, the predicted temperature of the power device under the working condition parameter is determined by acquiring the working condition parameter of the power device with the temperature controlled by the cooling liquid and according to a mapping relation between the preset working condition parameter and the temperature of the power device; further judging whether the absolute value of the temperature difference between the predicted temperature of the power device and the actual temperature of the power device acquired by the temperature sensor of the power device is larger than a preset temperature difference threshold value or not; determining whether the temperature control of the cooling liquid on the power device is normal or not by judging the temperature difference condition between the actual temperature and the standard temperature control temperature of the power device at the moment; if the absolute value of the temperature difference between the predicted temperature of the power device and the actual temperature of the power device is larger than a preset temperature difference threshold value, the fact that a larger difference exists between the actual temperature of the power device and the standard temperature control temperature at the moment is indicated, and then the condition that the cooling liquid is abnormal in temperature control of the power device, namely the cooling liquid temperature sensor is abnormal, is determined, so that the accuracy of judging the abnormal condition of the cooling liquid temperature sensor is improved; if the absolute value of the temperature difference between the predicted temperature of the power device and the actual temperature of the power device is smaller than or equal to a preset temperature difference threshold, which indicates that the temperature difference between the actual temperature of the power device and the standard temperature control temperature is smaller, the temperature of the power device is temporarily normal by the cooling liquid, namely, the temperature of the power device is temporarily normal, in order to avoid the erroneous judgment of the abnormal condition of the cooling liquid temperature sensor, the time threshold for the abnormal judgment of the cooling liquid temperature sensor is properly prolonged, and because the temperature of the power device is in the normal range, the accuracy of the abnormal judgment of the cooling liquid temperature sensor can be further improved by properly prolonging the time threshold for the abnormal judgment of the cooling liquid temperature sensor under the safe state of the power device.

In a possible implementation manner, in step S35, the step of determining whether the duration of the anomaly is greater than a preset second duration threshold value includes:

step S351, if the abnormal duration is longer than the second duration threshold, executing the step of judging that the temperature sensor is abnormal;

if the abnormal duration time of which the first temperature change amplitude is smaller than the preset abnormal amplitude threshold value is longer than the preset second duration time threshold value, the change amplitude of the temperature data collected by the cooling liquid temperature sensor is still small after the monitoring for a longer time, and the step of judging that the temperature sensor is abnormal is executed.

And step S352, if the abnormal duration is less than or equal to the second duration threshold, judging that the cooling liquid temperature sensor is normal, and resetting the abnormal duration.

If the abnormal duration time of which the first temperature change amplitude value is smaller than the preset abnormal amplitude value threshold value is smaller than or equal to the preset second duration time threshold value, and the temperature data acquired by the cooling liquid temperature sensor are changed, judging that the cooling liquid temperature sensor is normal, and resetting the abnormal duration time.

In this embodiment, by properly extending the threshold value of the duration of the abnormal judgment of the coolant temperature sensor, the accuracy of the abnormal judgment of the coolant temperature sensor can be further improved in a safe state of the power device, and after confirming that the coolant temperature sensor is normal, the abnormal duration is cleared, so that the accuracy of the abnormal detection of the coolant temperature sensor is further improved.

In a possible embodiment, in step S30, after the step of when the first temperature change amplitude is smaller than a preset abnormal amplitude threshold, the method includes:

step S36, obtaining a target torque of the power device which is in temperature control with the cooling liquid;

step S37, controlling the running torque of the power device according to the target torque;

when the first temperature change amplitude is smaller than a preset abnormal amplitude threshold value, acquiring torque (hereinafter referred to as target torque for distinguishing) of the power device with the temperature controlled by the cooling liquid; the first temperature data of the cooling liquid can be approximately used as normal temperature data, namely the target torque is the torque of the power device when the vehicle is normal; further, the running torque of the power plant of the vehicle is controlled based on the target torque.

The running torque is the actual torque during running of the vehicle.

In another possible embodiment, step S37, the step of controlling the operating torque of the power device according to the target torque includes:

step S371, obtaining a required torque of the power device, and judging whether the required torque is smaller than the target torque;

Step S372, if yes, taking the required torque as the running torque;

and step S373, if not, taking the target torque as the running torque.

Acquiring the required torque of the power device, and judging the magnitude relation between the required torque and the target torque; the required torque is the torque required after the working condition of the vehicle is changed; if the required torque is smaller than the target torque, the temperature of the power device under the required torque is indicated not to be higher than the temperature under the target torque, namely the problem of overhigh temperature of the power device is avoided; the required torque is taken as the running torque even if the power plant is responsive to the required torque; if the required torque is greater than or equal to the target torque, the temperature of the power device under the required torque may be higher than the temperature under the target torque, and because the coolant temperature sensor is abnormal at this time, it is difficult to accurately adjust the coolant temperature to control the temperature of the power device, so that the problem of overhigh temperature of the power device may occur; and taking the target torque as the running torque to avoid the occurrence of the condition that the temperature of the power device is too high and ensure the driving safety.

Step S38, determining a first temperature control gear adapted to the target torque according to a mapping relation between a preset torque and the temperature control gear, wherein the temperature control gear is a working gear of a temperature control device of the power device;

matching the obtained target torque with a mapping relation between a preset torque and a temperature control gear to determine a first temperature control gear matched with the target torque; the temperature control gear is a working gear of the temperature control device matched with the power device.

The temperature control device can adjust the temperature of the cooling liquid according to the temperature control gear so as to realize the temperature regulation and control of the power device, and the temperature control device can comprise a water pump and a fan; the flow of the cooling liquid is controlled by adjusting the rotating speed of the water pump, so that the temperature of the power device is regulated and controlled; air is sucked through the fan, heat dissipation is promoted, the temperature of cooling liquid is reduced, and then the temperature of the power device is regulated and controlled.

The mapping relation between the preset torque and the temperature control gear is a mutual corresponding relation between the torque of the power device and the temperature control gear of the temperature control device, and can represent that the power device of the vehicle is suitable for the temperature control gear of the temperature control device under different torques, and the mapping relation can be a mapping table or a formula, and can also be a preset trained temperature control gear prediction model.

And step S39, determining a target temperature control gear of the temperature control device according to the first temperature control gear and the current temperature control gear of the temperature control device, and controlling the temperature control device to respond to the target temperature control gear so as to change the temperature of the cooling liquid.

Determining a target temperature control gear of the temperature control device according to the first temperature control gear and a current actual working gear of the temperature control device (hereinafter referred to as a current temperature control gear to show distinction); and further controlling the temperature control device to respond to the target temperature control gear so as to change the temperature of the cooling liquid.

In a possible implementation manner, the step of determining the target temperature control gear of the temperature control device according to the first temperature control gear and the current temperature control gear of the temperature control device includes:

judging whether the absolute value of the gear grade difference between the first temperature control gear and the current temperature control gear is larger than a preset gear grade difference threshold value, wherein the higher the cooling efficiency of the temperature of the cooling liquid is, the higher the gear grade is; if so, a large gear difference exists between the first temperature control gear and the current temperature control gear, if gear switching is carried out between the first temperature control gear and the current temperature control gear, the temperature of the cooling liquid changes obviously, and meanwhile, the running torque of the power device is controlled according to the target torque, so that the power device cannot have the problem of overhigh temperature under the first temperature control gear; taking the first temperature control gear as the target temperature control gear; furthermore, on the basis of ensuring the driving safety, the energy sources can be effectively saved; if not, the first temperature control gear is indicated to have smaller gear difference with the current temperature control gear, and if the gear is switched between the first temperature control gear and the current temperature control gear, the temperature of the cooling liquid may not change obviously; in order to ensure driving safety, the current temperature control gear is increased by a preset adjustment level; if the preset adjustment level cannot be improved, taking the temperature control gear of the highest gear level as the target temperature control gear.

The gear level of the temperature control gear of the temperature control device comprises 7 levels, wherein the cooling effect of the level one is the best, and the cooling effect of the level seven is the weakest; the first temperature control gear is of a grade five, the gear grade difference threshold is two, namely two grades are different, and the preset adjustment grade is three; and if the current temperature control gear is of a grade two, namely the absolute value of the gear grade difference between the first temperature control gear and the current temperature control gear is three and is larger than the gear grade difference threshold value, taking the first temperature control gear as a grade five as a target temperature control gear. If the current temperature control gear is of level four, namely the absolute value of the gear level difference between the first temperature control gear and the current temperature control gear is one and is smaller than the gear level difference threshold value, the level four is improved by three levels, namely the target temperature control gear is of level seven.

In the embodiment, when the first temperature change amplitude is smaller than a preset abnormal amplitude threshold, acquiring the target torque of the power device with the temperature controlled by the cooling liquid; the first temperature data of the cooling liquid can be approximately used as normal temperature data, namely the target torque is the torque of the power device when the vehicle is normal; further, according to the target torque, the running torque of the power device of the vehicle is controlled, so that the occurrence of the condition that the temperature of the power device is too high can be avoided, and the driving safety is ensured; and then according to the target temperature control gear, the working gear of the temperature control device is adjusted, so that the temperature of the cooling liquid is actively changed, and the driving safety is ensured.

Further, based on the above-described first and/or second embodiments, a third embodiment of the temperature sensor abnormality detection method of the present application is proposed, in which, after step S30, it includes:

step S40, dynamically acquiring second temperature data of the cooling liquid acquired by the cooling liquid temperature sensor;

after the step of executing the preset temperature sensor abnormality processing strategy, continuing to acquire the coolant temperature data (hereinafter referred to as coolant second temperature data to show distinction) acquired by the coolant temperature sensor;

step S50, determining a second temperature change amplitude of the cooling liquid according to the second temperature data of the cooling liquid, and judging whether the second temperature change amplitude in a preset temperature control duration is greater than or equal to the abnormal amplitude threshold;

determining a second temperature change amplitude of the cooling liquid in a preset acquisition time interval according to the second temperature data of the cooling liquid; judging whether the second temperature change amplitude is larger than or equal to the abnormal amplitude threshold value within the preset temperature control duration; and further judging whether the abnormality of the cooling liquid temperature sensor can be recovered or not through the active change of the cooling liquid temperature in the abnormality processing strategy of the temperature sensor.

Step S60, if yes, judging that the cooling liquid temperature sensor is normal, and releasing the abnormal processing strategy of the temperature sensor;

and step S70, if not, judging that the cooling liquid temperature sensor fails, and outputting a preset failure signal.

If yes, the coolant temperature sensor can acquire variable temperature data, the coolant temperature sensor is judged to be normal, and the abnormal processing strategy of the temperature sensor is relieved. If not, after actively changing the temperature of the cooling liquid, the temperature data collected by the cooling liquid temperature sensor is almost unchanged, namely, the abnormality of the cooling liquid temperature sensor is difficult to recover, and then the cooling liquid temperature sensor is judged to be faulty, and a preset fault signal is output; the fault signal can be sent to a display device of the vehicle and user equipment associated with the vehicle so as to prompt a user that the cooling liquid temperature sensor has a certain potential safety hazard and needs to be maintained in time to ensure driving safety.

Illustratively, the abnormal condition of the coolant temperature sensor is divided into: suspected anomalies, anomalies and faults; the suspected abnormality means that the fluctuation of temperature data acquired by a cooling liquid temperature sensor is weak, the duration of the abnormality is short, the current temperature of the power device is normal, and the driving risk degree is low; the abnormality means that the fluctuation of temperature data collected by the cooling liquid temperature sensor is weak, the duration of the abnormality is long and/or the current temperature of the power device is abnormal, but the abnormality is still in a controllable range and can be possibly recovered by executing a preset temperature sensor abnormality processing strategy; the failure refers to that the cooling liquid temperature sensor cannot recover from the failure and needs to be maintained or replaced.

In this embodiment, after executing the preset temperature sensor abnormality processing policy, the detection of the abnormal situation of the coolant temperature sensor is continued to determine whether the abnormality of the coolant temperature sensor can be recovered after actively executing the preset temperature sensor abnormality processing policy, if still unable to recover, it is determined that the coolant temperature sensor has a failure that cannot recover by itself, and in order to ensure driving safety, a preset failure signal is output to remind the vehicle owner to repair in time.

Further, based on the first, second and/or third embodiments, a more complete embodiment of the method for detecting abnormality of a temperature sensor according to the present application is provided, referring to fig. 4, after a vehicle is started, first temperature data of a cooling liquid collected by a cooling liquid temperature sensor is obtained through a temperature sensor data collecting module; further, a first temperature change amplitude of the cooling liquid is determined through a temperature change amplitude detection module; further judging whether the first temperature change amplitude is smaller than a preset abnormal amplitude threshold value or not; if not, continuously passing through a temperature sensor data acquisition module to acquire first temperature data of the cooling liquid acquired by the cooling liquid temperature sensor; if yes, a timer module is started, the abnormal duration time that the first temperature change amplitude is smaller than the preset abnormal amplitude threshold value is recorded, and the target torque of the power device with the temperature controlled by the cooling liquid is obtained; when the abnormal duration time is longer than a preset first time threshold value, working condition parameters of the power device with the temperature controlled by the cooling liquid are obtained, and according to a mapping relation between the preset working condition parameters and the temperature of the power device, the predicted temperature of the power device under the working condition parameters is determined; further judging whether the absolute value of the temperature difference between the predicted temperature of the power device and the actual temperature of the power device acquired by the temperature sensor of the power device is larger than a preset temperature difference threshold value or not; if yes, judging that the cooling liquid temperature sensor is abnormal; if not, judging whether the cooling liquid temperature sensor is suspected to be abnormal, and judging whether the duration of the abnormality is greater than a preset second duration threshold, wherein the first duration threshold is smaller than the second duration threshold; if yes, judging that the temperature sensor is abnormal; if not, judging that the cooling liquid temperature sensor is normal, and resetting the abnormal duration. Further, after the abnormality of the temperature sensor is determined, controlling the running torque of the power device according to the obtained target torque; further, according to a mapping relation between the preset torque and the temperature control gear, determining a first temperature control gear which is matched with the target torque; and further, according to the first temperature control gear and the current temperature control gear of the temperature control device, determining a target temperature control gear of the temperature control device, and controlling the temperature control device to respond to the target temperature control gear so as to change the temperature of the cooling liquid, wherein the temperature control device comprises: a water pump and a fan; increasing the flow of the cooling liquid by increasing the rotation speed of the water pump so as to reduce the temperature of the cooling liquid; increasing the air quantity by increasing the rotating speed of the fan so as to reduce the temperature of the cooling liquid; further, continuously and dynamically acquiring second temperature data of the cooling liquid acquired by the cooling liquid temperature sensor; determining a second temperature change amplitude of the cooling liquid according to the second temperature data of the cooling liquid, and judging whether the second temperature change amplitude in a preset temperature control duration is smaller than the abnormal amplitude threshold; if not, judging that the cooling liquid temperature sensor is normal, and releasing the abnormal processing strategy of the temperature sensor; if yes, judging that the cooling liquid temperature sensor fails, and outputting a preset failure signal through a failure alarm module.

Further, an embodiment of the present application further provides a temperature sensor abnormality detection apparatus, referring to fig. 5, which is applied to an electronic device, and includes:

an acquisition module 10, configured to dynamically acquire first temperature data of the cooling liquid acquired by the cooling liquid temperature sensor;

the determining module 20 is configured to determine a first temperature change amplitude of the cooling liquid according to the first temperature data of the cooling liquid, where the first temperature change amplitude is a maximum temperature change amplitude of the first temperature data of the cooling liquid within a preset collection time interval;

and the execution module 30 is configured to determine that the temperature sensor is abnormal and execute a preset temperature sensor abnormality processing policy when the first temperature change amplitude is less than a preset abnormality amplitude threshold and an abnormality duration time of the first temperature change amplitude less than the preset abnormality amplitude threshold is greater than a preset first time threshold.

The execution module 30 is further configured to obtain a working condition parameter of the power device with the temperature controlled by the cooling liquid, and determine a predicted temperature of the power device under the working condition parameter according to a mapping relationship between a preset working condition parameter and the temperature of the power device;

if yes, executing the step of judging that the temperature sensor is abnormal;

The execution module 30 is further configured to execute the step of determining that the temperature sensor is abnormal if the duration of the abnormality is greater than the second duration threshold;

The execution module 30 is further configured to obtain a target torque of the power device that is temperature-controlled with the cooling liquid;

The execution module 30 is further configured to obtain a required torque of the power device, and determine whether the required torque is less than the target torque;

if yes, taking the required torque as the running torque;

and if not, taking the target torque as the running torque.

The execution module 30 is further configured to dynamically acquire second temperature data of the cooling liquid acquired by the cooling liquid temperature sensor;

The execution module 30 is further configured to clear the abnormal duration if the first temperature change amplitude is greater than or equal to a preset abnormal amplitude threshold within the first time duration threshold.

The specific embodiment of the temperature sensor abnormality detection device is basically the same as the above embodiments of the temperature sensor abnormality detection method, and will not be described herein.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present application.

The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the application, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims

1. A temperature sensor abnormality detection method, characterized by comprising the steps of:

2. The temperature sensor abnormality detection method according to claim 1, characterized by further comprising, before the step of determining that the temperature sensor is abnormal:

if yes, executing the step of judging that the temperature sensor is abnormal;

3. The temperature sensor abnormality detection method according to claim 2, characterized by comprising, after said step of determining whether said abnormality duration is greater than a preset second duration threshold:

4. The temperature sensor abnormality detection method according to claim 1, characterized by comprising, after the step of when the first temperature change amplitude is smaller than a preset abnormality amplitude threshold:

5. The temperature sensor abnormality detection method according to claim 4, characterized in that said step of controlling the running torque of said power device in accordance with said target torque includes:

If yes, taking the required torque as the running torque;

and if not, taking the target torque as the running torque.

6. The temperature sensor abnormality detection method according to claim 1, characterized by further comprising, after said step of executing a preset temperature sensor abnormality processing policy:

7. The temperature sensor abnormality detection method according to claim 1, characterized by further comprising, after said step of when said first temperature change amplitude is smaller than a preset abnormality amplitude threshold:

8. A temperature sensor abnormality detection device, characterized by comprising:

9. An electronic device, the device comprising: a memory, a processor, and a temperature sensor abnormality detection program stored on the memory and executable on the processor, the temperature sensor abnormality detection program configured to implement the steps of the temperature sensor abnormality detection method according to any one of claims 1 to 7.

10. A storage medium having stored thereon a temperature sensor abnormality detection program which, when executed by a processor, implements the steps of the temperature sensor abnormality detection method according to any one of claims 1 to 7.